1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999, 2009
9 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
10 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
11 */
12
13 #define KMSG_COMPONENT "dasd-eckd"
14
15 #include <linux/stddef.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/hdreg.h> /* HDIO_GETGEO */
19 #include <linux/bio.h>
20 #include <linux/module.h>
21 #include <linux/compat.h>
22 #include <linux/init.h>
23 #include <linux/seq_file.h>
24 #include <linux/uaccess.h>
25 #include <linux/io.h>
26
27 #include <asm/css_chars.h>
28 #include <asm/debug.h>
29 #include <asm/idals.h>
30 #include <asm/ebcdic.h>
31 #include <asm/cio.h>
32 #include <asm/ccwdev.h>
33 #include <asm/itcw.h>
34 #include <asm/schid.h>
35 #include <asm/chpid.h>
36
37 #include "dasd_int.h"
38 #include "dasd_eckd.h"
39
40 #ifdef PRINTK_HEADER
41 #undef PRINTK_HEADER
42 #endif /* PRINTK_HEADER */
43 #define PRINTK_HEADER "dasd(eckd):"
44
45 /*
46 * raw track access always map to 64k in memory
47 * so it maps to 16 blocks of 4k per track
48 */
49 #define DASD_RAW_BLOCK_PER_TRACK 16
50 #define DASD_RAW_BLOCKSIZE 4096
51 /* 64k are 128 x 512 byte sectors */
52 #define DASD_RAW_SECTORS_PER_TRACK 128
53
54 MODULE_LICENSE("GPL");
55
56 static struct dasd_discipline dasd_eckd_discipline;
57
58 /* The ccw bus type uses this table to find devices that it sends to
59 * dasd_eckd_probe */
60 static struct ccw_device_id dasd_eckd_ids[] = {
61 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
62 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
63 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
64 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
65 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
66 { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
67 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
68 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
69 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
70 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
71 { /* end of list */ },
72 };
73
74 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
75
76 static struct ccw_driver dasd_eckd_driver; /* see below */
77
78 static void *rawpadpage;
79
80 #define INIT_CQR_OK 0
81 #define INIT_CQR_UNFORMATTED 1
82 #define INIT_CQR_ERROR 2
83
84 /* emergency request for reserve/release */
85 static struct {
86 struct dasd_ccw_req cqr;
87 struct ccw1 ccw;
88 char data[32];
89 } *dasd_reserve_req;
90 static DEFINE_MUTEX(dasd_reserve_mutex);
91
92 static struct {
93 struct dasd_ccw_req cqr;
94 struct ccw1 ccw[2];
95 char data[40];
96 } *dasd_vol_info_req;
97 static DEFINE_MUTEX(dasd_vol_info_mutex);
98
99 struct ext_pool_exhaust_work_data {
100 struct work_struct worker;
101 struct dasd_device *device;
102 struct dasd_device *base;
103 };
104
105 /* definitions for the path verification worker */
106 struct pe_handler_work_data {
107 struct work_struct worker;
108 struct dasd_device *device;
109 struct dasd_ccw_req cqr;
110 struct ccw1 ccw;
111 __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
112 int isglobal;
113 __u8 tbvpm;
114 __u8 fcsecpm;
115 };
116 static struct pe_handler_work_data *pe_handler_worker;
117 static DEFINE_MUTEX(dasd_pe_handler_mutex);
118
119 struct check_attention_work_data {
120 struct work_struct worker;
121 struct dasd_device *device;
122 __u8 lpum;
123 };
124
125 static int dasd_eckd_ext_pool_id(struct dasd_device *);
126 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
127 struct dasd_device *, struct dasd_device *,
128 unsigned int, int, unsigned int, unsigned int,
129 unsigned int, unsigned int);
130 static int dasd_eckd_query_pprc_status(struct dasd_device *,
131 struct dasd_pprc_data_sc4 *);
132
133 /* initial attempt at a probe function. this can be simplified once
134 * the other detection code is gone */
135 static int
dasd_eckd_probe(struct ccw_device * cdev)136 dasd_eckd_probe (struct ccw_device *cdev)
137 {
138 int ret;
139
140 /* set ECKD specific ccw-device options */
141 ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
142 CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
143 if (ret) {
144 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
145 "dasd_eckd_probe: could not set "
146 "ccw-device options");
147 return ret;
148 }
149 ret = dasd_generic_probe(cdev);
150 return ret;
151 }
152
153 static int
dasd_eckd_set_online(struct ccw_device * cdev)154 dasd_eckd_set_online(struct ccw_device *cdev)
155 {
156 return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
157 }
158
159 static const int sizes_trk0[] = { 28, 148, 84 };
160 #define LABEL_SIZE 140
161
162 /* head and record addresses of count_area read in analysis ccw */
163 static const int count_area_head[] = { 0, 0, 0, 0, 1 };
164 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
165
166 static inline unsigned int
ceil_quot(unsigned int d1,unsigned int d2)167 ceil_quot(unsigned int d1, unsigned int d2)
168 {
169 return (d1 + (d2 - 1)) / d2;
170 }
171
172 static unsigned int
recs_per_track(struct dasd_eckd_characteristics * rdc,unsigned int kl,unsigned int dl)173 recs_per_track(struct dasd_eckd_characteristics * rdc,
174 unsigned int kl, unsigned int dl)
175 {
176 int dn, kn;
177
178 switch (rdc->dev_type) {
179 case 0x3380:
180 if (kl)
181 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
182 ceil_quot(dl + 12, 32));
183 else
184 return 1499 / (15 + ceil_quot(dl + 12, 32));
185 case 0x3390:
186 dn = ceil_quot(dl + 6, 232) + 1;
187 if (kl) {
188 kn = ceil_quot(kl + 6, 232) + 1;
189 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
190 9 + ceil_quot(dl + 6 * dn, 34));
191 } else
192 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
193 case 0x9345:
194 dn = ceil_quot(dl + 6, 232) + 1;
195 if (kl) {
196 kn = ceil_quot(kl + 6, 232) + 1;
197 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
198 ceil_quot(dl + 6 * dn, 34));
199 } else
200 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
201 }
202 return 0;
203 }
204
set_ch_t(struct ch_t * geo,__u32 cyl,__u8 head)205 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
206 {
207 geo->cyl = (__u16) cyl;
208 geo->head = cyl >> 16;
209 geo->head <<= 4;
210 geo->head |= head;
211 }
212
213 /*
214 * calculate failing track from sense data depending if
215 * it is an EAV device or not
216 */
dasd_eckd_track_from_irb(struct irb * irb,struct dasd_device * device,sector_t * track)217 static int dasd_eckd_track_from_irb(struct irb *irb, struct dasd_device *device,
218 sector_t *track)
219 {
220 struct dasd_eckd_private *private = device->private;
221 u8 *sense = NULL;
222 u32 cyl;
223 u8 head;
224
225 sense = dasd_get_sense(irb);
226 if (!sense) {
227 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
228 "ESE error no sense data\n");
229 return -EINVAL;
230 }
231 if (!(sense[27] & DASD_SENSE_BIT_2)) {
232 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
233 "ESE error no valid track data\n");
234 return -EINVAL;
235 }
236
237 if (sense[27] & DASD_SENSE_BIT_3) {
238 /* enhanced addressing */
239 cyl = sense[30] << 20;
240 cyl |= (sense[31] & 0xF0) << 12;
241 cyl |= sense[28] << 8;
242 cyl |= sense[29];
243 } else {
244 cyl = sense[29] << 8;
245 cyl |= sense[30];
246 }
247 head = sense[31] & 0x0F;
248 *track = cyl * private->rdc_data.trk_per_cyl + head;
249 return 0;
250 }
251
set_timestamp(struct ccw1 * ccw,struct DE_eckd_data * data,struct dasd_device * device)252 static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
253 struct dasd_device *device)
254 {
255 struct dasd_eckd_private *private = device->private;
256 int rc;
257
258 rc = get_phys_clock(&data->ep_sys_time);
259 /*
260 * Ignore return code if XRC is not supported or
261 * sync clock is switched off
262 */
263 if ((rc && !private->rdc_data.facilities.XRC_supported) ||
264 rc == -EOPNOTSUPP || rc == -EACCES)
265 return 0;
266
267 /* switch on System Time Stamp - needed for XRC Support */
268 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
269 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
270
271 if (ccw) {
272 ccw->count = sizeof(struct DE_eckd_data);
273 ccw->flags |= CCW_FLAG_SLI;
274 }
275
276 return rc;
277 }
278
279 static int
define_extent(struct ccw1 * ccw,struct DE_eckd_data * data,unsigned int trk,unsigned int totrk,int cmd,struct dasd_device * device,int blksize)280 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
281 unsigned int totrk, int cmd, struct dasd_device *device,
282 int blksize)
283 {
284 struct dasd_eckd_private *private = device->private;
285 u16 heads, beghead, endhead;
286 u32 begcyl, endcyl;
287 int rc = 0;
288
289 if (ccw) {
290 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
291 ccw->flags = 0;
292 ccw->count = 16;
293 ccw->cda = (__u32)virt_to_phys(data);
294 }
295
296 memset(data, 0, sizeof(struct DE_eckd_data));
297 switch (cmd) {
298 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
299 case DASD_ECKD_CCW_READ_RECORD_ZERO:
300 case DASD_ECKD_CCW_READ:
301 case DASD_ECKD_CCW_READ_MT:
302 case DASD_ECKD_CCW_READ_CKD:
303 case DASD_ECKD_CCW_READ_CKD_MT:
304 case DASD_ECKD_CCW_READ_KD:
305 case DASD_ECKD_CCW_READ_KD_MT:
306 data->mask.perm = 0x1;
307 data->attributes.operation = private->attrib.operation;
308 break;
309 case DASD_ECKD_CCW_READ_COUNT:
310 data->mask.perm = 0x1;
311 data->attributes.operation = DASD_BYPASS_CACHE;
312 break;
313 case DASD_ECKD_CCW_READ_TRACK:
314 case DASD_ECKD_CCW_READ_TRACK_DATA:
315 data->mask.perm = 0x1;
316 data->attributes.operation = private->attrib.operation;
317 data->blk_size = 0;
318 break;
319 case DASD_ECKD_CCW_WRITE:
320 case DASD_ECKD_CCW_WRITE_MT:
321 case DASD_ECKD_CCW_WRITE_KD:
322 case DASD_ECKD_CCW_WRITE_KD_MT:
323 data->mask.perm = 0x02;
324 data->attributes.operation = private->attrib.operation;
325 rc = set_timestamp(ccw, data, device);
326 break;
327 case DASD_ECKD_CCW_WRITE_CKD:
328 case DASD_ECKD_CCW_WRITE_CKD_MT:
329 data->attributes.operation = DASD_BYPASS_CACHE;
330 rc = set_timestamp(ccw, data, device);
331 break;
332 case DASD_ECKD_CCW_ERASE:
333 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
334 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
335 data->mask.perm = 0x3;
336 data->mask.auth = 0x1;
337 data->attributes.operation = DASD_BYPASS_CACHE;
338 rc = set_timestamp(ccw, data, device);
339 break;
340 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
341 data->mask.perm = 0x03;
342 data->attributes.operation = private->attrib.operation;
343 data->blk_size = 0;
344 break;
345 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
346 data->mask.perm = 0x02;
347 data->attributes.operation = private->attrib.operation;
348 data->blk_size = blksize;
349 rc = set_timestamp(ccw, data, device);
350 break;
351 default:
352 dev_err(&device->cdev->dev,
353 "0x%x is not a known command\n", cmd);
354 break;
355 }
356
357 data->attributes.mode = 0x3; /* ECKD */
358
359 if ((private->rdc_data.cu_type == 0x2105 ||
360 private->rdc_data.cu_type == 0x2107 ||
361 private->rdc_data.cu_type == 0x1750)
362 && !(private->uses_cdl && trk < 2))
363 data->ga_extended |= 0x40; /* Regular Data Format Mode */
364
365 heads = private->rdc_data.trk_per_cyl;
366 begcyl = trk / heads;
367 beghead = trk % heads;
368 endcyl = totrk / heads;
369 endhead = totrk % heads;
370
371 /* check for sequential prestage - enhance cylinder range */
372 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
373 data->attributes.operation == DASD_SEQ_ACCESS) {
374
375 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
376 endcyl += private->attrib.nr_cyl;
377 else
378 endcyl = (private->real_cyl - 1);
379 }
380
381 set_ch_t(&data->beg_ext, begcyl, beghead);
382 set_ch_t(&data->end_ext, endcyl, endhead);
383 return rc;
384 }
385
386
locate_record_ext(struct ccw1 * ccw,struct LRE_eckd_data * data,unsigned int trk,unsigned int rec_on_trk,int count,int cmd,struct dasd_device * device,unsigned int reclen,unsigned int tlf)387 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
388 unsigned int trk, unsigned int rec_on_trk,
389 int count, int cmd, struct dasd_device *device,
390 unsigned int reclen, unsigned int tlf)
391 {
392 struct dasd_eckd_private *private = device->private;
393 int sector;
394 int dn, d;
395
396 if (ccw) {
397 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
398 ccw->flags = 0;
399 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
400 ccw->count = 22;
401 else
402 ccw->count = 20;
403 ccw->cda = (__u32)virt_to_phys(data);
404 }
405
406 memset(data, 0, sizeof(*data));
407 sector = 0;
408 if (rec_on_trk) {
409 switch (private->rdc_data.dev_type) {
410 case 0x3390:
411 dn = ceil_quot(reclen + 6, 232);
412 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
413 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
414 break;
415 case 0x3380:
416 d = 7 + ceil_quot(reclen + 12, 32);
417 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
418 break;
419 }
420 }
421 data->sector = sector;
422 /* note: meaning of count depends on the operation
423 * for record based I/O it's the number of records, but for
424 * track based I/O it's the number of tracks
425 */
426 data->count = count;
427 switch (cmd) {
428 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
429 data->operation.orientation = 0x3;
430 data->operation.operation = 0x03;
431 break;
432 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
433 data->operation.orientation = 0x3;
434 data->operation.operation = 0x16;
435 break;
436 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
437 data->operation.orientation = 0x1;
438 data->operation.operation = 0x03;
439 data->count++;
440 break;
441 case DASD_ECKD_CCW_READ_RECORD_ZERO:
442 data->operation.orientation = 0x3;
443 data->operation.operation = 0x16;
444 data->count++;
445 break;
446 case DASD_ECKD_CCW_WRITE:
447 case DASD_ECKD_CCW_WRITE_MT:
448 case DASD_ECKD_CCW_WRITE_KD:
449 case DASD_ECKD_CCW_WRITE_KD_MT:
450 data->auxiliary.length_valid = 0x1;
451 data->length = reclen;
452 data->operation.operation = 0x01;
453 break;
454 case DASD_ECKD_CCW_WRITE_CKD:
455 case DASD_ECKD_CCW_WRITE_CKD_MT:
456 data->auxiliary.length_valid = 0x1;
457 data->length = reclen;
458 data->operation.operation = 0x03;
459 break;
460 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
461 data->operation.orientation = 0x0;
462 data->operation.operation = 0x3F;
463 data->extended_operation = 0x11;
464 data->length = 0;
465 data->extended_parameter_length = 0x02;
466 if (data->count > 8) {
467 data->extended_parameter[0] = 0xFF;
468 data->extended_parameter[1] = 0xFF;
469 data->extended_parameter[1] <<= (16 - count);
470 } else {
471 data->extended_parameter[0] = 0xFF;
472 data->extended_parameter[0] <<= (8 - count);
473 data->extended_parameter[1] = 0x00;
474 }
475 data->sector = 0xFF;
476 break;
477 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
478 data->auxiliary.length_valid = 0x1;
479 data->length = reclen; /* not tlf, as one might think */
480 data->operation.operation = 0x3F;
481 data->extended_operation = 0x23;
482 break;
483 case DASD_ECKD_CCW_READ:
484 case DASD_ECKD_CCW_READ_MT:
485 case DASD_ECKD_CCW_READ_KD:
486 case DASD_ECKD_CCW_READ_KD_MT:
487 data->auxiliary.length_valid = 0x1;
488 data->length = reclen;
489 data->operation.operation = 0x06;
490 break;
491 case DASD_ECKD_CCW_READ_CKD:
492 case DASD_ECKD_CCW_READ_CKD_MT:
493 data->auxiliary.length_valid = 0x1;
494 data->length = reclen;
495 data->operation.operation = 0x16;
496 break;
497 case DASD_ECKD_CCW_READ_COUNT:
498 data->operation.operation = 0x06;
499 break;
500 case DASD_ECKD_CCW_READ_TRACK:
501 data->operation.orientation = 0x1;
502 data->operation.operation = 0x0C;
503 data->extended_parameter_length = 0;
504 data->sector = 0xFF;
505 break;
506 case DASD_ECKD_CCW_READ_TRACK_DATA:
507 data->auxiliary.length_valid = 0x1;
508 data->length = tlf;
509 data->operation.operation = 0x0C;
510 break;
511 case DASD_ECKD_CCW_ERASE:
512 data->length = reclen;
513 data->auxiliary.length_valid = 0x1;
514 data->operation.operation = 0x0b;
515 break;
516 default:
517 DBF_DEV_EVENT(DBF_ERR, device,
518 "fill LRE unknown opcode 0x%x", cmd);
519 BUG();
520 }
521 set_ch_t(&data->seek_addr,
522 trk / private->rdc_data.trk_per_cyl,
523 trk % private->rdc_data.trk_per_cyl);
524 data->search_arg.cyl = data->seek_addr.cyl;
525 data->search_arg.head = data->seek_addr.head;
526 data->search_arg.record = rec_on_trk;
527 }
528
prefix_LRE(struct ccw1 * ccw,struct PFX_eckd_data * pfxdata,unsigned int trk,unsigned int totrk,int cmd,struct dasd_device * basedev,struct dasd_device * startdev,unsigned int format,unsigned int rec_on_trk,int count,unsigned int blksize,unsigned int tlf)529 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
530 unsigned int trk, unsigned int totrk, int cmd,
531 struct dasd_device *basedev, struct dasd_device *startdev,
532 unsigned int format, unsigned int rec_on_trk, int count,
533 unsigned int blksize, unsigned int tlf)
534 {
535 struct dasd_eckd_private *basepriv, *startpriv;
536 struct LRE_eckd_data *lredata;
537 struct DE_eckd_data *dedata;
538 int rc = 0;
539
540 basepriv = basedev->private;
541 startpriv = startdev->private;
542 dedata = &pfxdata->define_extent;
543 lredata = &pfxdata->locate_record;
544
545 ccw->cmd_code = DASD_ECKD_CCW_PFX;
546 ccw->flags = 0;
547 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
548 ccw->count = sizeof(*pfxdata) + 2;
549 ccw->cda = (__u32)virt_to_phys(pfxdata);
550 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
551 } else {
552 ccw->count = sizeof(*pfxdata);
553 ccw->cda = (__u32)virt_to_phys(pfxdata);
554 memset(pfxdata, 0, sizeof(*pfxdata));
555 }
556
557 /* prefix data */
558 if (format > 1) {
559 DBF_DEV_EVENT(DBF_ERR, basedev,
560 "PFX LRE unknown format 0x%x", format);
561 BUG();
562 return -EINVAL;
563 }
564 pfxdata->format = format;
565 pfxdata->base_address = basepriv->conf.ned->unit_addr;
566 pfxdata->base_lss = basepriv->conf.ned->ID;
567 pfxdata->validity.define_extent = 1;
568
569 /* private uid is kept up to date, conf_data may be outdated */
570 if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
571 pfxdata->validity.verify_base = 1;
572
573 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
574 pfxdata->validity.verify_base = 1;
575 pfxdata->validity.hyper_pav = 1;
576 }
577
578 rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
579
580 /*
581 * For some commands the System Time Stamp is set in the define extent
582 * data when XRC is supported. The validity of the time stamp must be
583 * reflected in the prefix data as well.
584 */
585 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
586 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
587
588 if (format == 1) {
589 locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
590 basedev, blksize, tlf);
591 }
592
593 return rc;
594 }
595
prefix(struct ccw1 * ccw,struct PFX_eckd_data * pfxdata,unsigned int trk,unsigned int totrk,int cmd,struct dasd_device * basedev,struct dasd_device * startdev)596 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
597 unsigned int trk, unsigned int totrk, int cmd,
598 struct dasd_device *basedev, struct dasd_device *startdev)
599 {
600 return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
601 0, 0, 0, 0, 0);
602 }
603
604 static void
locate_record(struct ccw1 * ccw,struct LO_eckd_data * data,unsigned int trk,unsigned int rec_on_trk,int no_rec,int cmd,struct dasd_device * device,int reclen)605 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
606 unsigned int rec_on_trk, int no_rec, int cmd,
607 struct dasd_device * device, int reclen)
608 {
609 struct dasd_eckd_private *private = device->private;
610 int sector;
611 int dn, d;
612
613 DBF_DEV_EVENT(DBF_INFO, device,
614 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
615 trk, rec_on_trk, no_rec, cmd, reclen);
616
617 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
618 ccw->flags = 0;
619 ccw->count = 16;
620 ccw->cda = (__u32)virt_to_phys(data);
621
622 memset(data, 0, sizeof(struct LO_eckd_data));
623 sector = 0;
624 if (rec_on_trk) {
625 switch (private->rdc_data.dev_type) {
626 case 0x3390:
627 dn = ceil_quot(reclen + 6, 232);
628 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
629 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
630 break;
631 case 0x3380:
632 d = 7 + ceil_quot(reclen + 12, 32);
633 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
634 break;
635 }
636 }
637 data->sector = sector;
638 data->count = no_rec;
639 switch (cmd) {
640 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
641 data->operation.orientation = 0x3;
642 data->operation.operation = 0x03;
643 break;
644 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
645 data->operation.orientation = 0x3;
646 data->operation.operation = 0x16;
647 break;
648 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
649 data->operation.orientation = 0x1;
650 data->operation.operation = 0x03;
651 data->count++;
652 break;
653 case DASD_ECKD_CCW_READ_RECORD_ZERO:
654 data->operation.orientation = 0x3;
655 data->operation.operation = 0x16;
656 data->count++;
657 break;
658 case DASD_ECKD_CCW_WRITE:
659 case DASD_ECKD_CCW_WRITE_MT:
660 case DASD_ECKD_CCW_WRITE_KD:
661 case DASD_ECKD_CCW_WRITE_KD_MT:
662 data->auxiliary.last_bytes_used = 0x1;
663 data->length = reclen;
664 data->operation.operation = 0x01;
665 break;
666 case DASD_ECKD_CCW_WRITE_CKD:
667 case DASD_ECKD_CCW_WRITE_CKD_MT:
668 data->auxiliary.last_bytes_used = 0x1;
669 data->length = reclen;
670 data->operation.operation = 0x03;
671 break;
672 case DASD_ECKD_CCW_READ:
673 case DASD_ECKD_CCW_READ_MT:
674 case DASD_ECKD_CCW_READ_KD:
675 case DASD_ECKD_CCW_READ_KD_MT:
676 data->auxiliary.last_bytes_used = 0x1;
677 data->length = reclen;
678 data->operation.operation = 0x06;
679 break;
680 case DASD_ECKD_CCW_READ_CKD:
681 case DASD_ECKD_CCW_READ_CKD_MT:
682 data->auxiliary.last_bytes_used = 0x1;
683 data->length = reclen;
684 data->operation.operation = 0x16;
685 break;
686 case DASD_ECKD_CCW_READ_COUNT:
687 data->operation.operation = 0x06;
688 break;
689 case DASD_ECKD_CCW_ERASE:
690 data->length = reclen;
691 data->auxiliary.last_bytes_used = 0x1;
692 data->operation.operation = 0x0b;
693 break;
694 default:
695 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
696 "opcode 0x%x", cmd);
697 }
698 set_ch_t(&data->seek_addr,
699 trk / private->rdc_data.trk_per_cyl,
700 trk % private->rdc_data.trk_per_cyl);
701 data->search_arg.cyl = data->seek_addr.cyl;
702 data->search_arg.head = data->seek_addr.head;
703 data->search_arg.record = rec_on_trk;
704 }
705
706 /*
707 * Returns 1 if the block is one of the special blocks that needs
708 * to get read/written with the KD variant of the command.
709 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
710 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
711 * Luckily the KD variants differ only by one bit (0x08) from the
712 * normal variant. So don't wonder about code like:
713 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
714 * ccw->cmd_code |= 0x8;
715 */
716 static inline int
dasd_eckd_cdl_special(int blk_per_trk,int recid)717 dasd_eckd_cdl_special(int blk_per_trk, int recid)
718 {
719 if (recid < 3)
720 return 1;
721 if (recid < blk_per_trk)
722 return 0;
723 if (recid < 2 * blk_per_trk)
724 return 1;
725 return 0;
726 }
727
728 /*
729 * Returns the record size for the special blocks of the cdl format.
730 * Only returns something useful if dasd_eckd_cdl_special is true
731 * for the recid.
732 */
733 static inline int
dasd_eckd_cdl_reclen(int recid)734 dasd_eckd_cdl_reclen(int recid)
735 {
736 if (recid < 3)
737 return sizes_trk0[recid];
738 return LABEL_SIZE;
739 }
740 /* create unique id from private structure. */
create_uid(struct dasd_conf * conf,struct dasd_uid * uid)741 static void create_uid(struct dasd_conf *conf, struct dasd_uid *uid)
742 {
743 int count;
744
745 memset(uid, 0, sizeof(struct dasd_uid));
746 memcpy(uid->vendor, conf->ned->HDA_manufacturer,
747 sizeof(uid->vendor) - 1);
748 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
749 memcpy(uid->serial, &conf->ned->serial,
750 sizeof(uid->serial) - 1);
751 EBCASC(uid->serial, sizeof(uid->serial) - 1);
752 uid->ssid = conf->gneq->subsystemID;
753 uid->real_unit_addr = conf->ned->unit_addr;
754 if (conf->sneq) {
755 uid->type = conf->sneq->sua_flags;
756 if (uid->type == UA_BASE_PAV_ALIAS)
757 uid->base_unit_addr = conf->sneq->base_unit_addr;
758 } else {
759 uid->type = UA_BASE_DEVICE;
760 }
761 if (conf->vdsneq) {
762 for (count = 0; count < 16; count++) {
763 sprintf(uid->vduit+2*count, "%02x",
764 conf->vdsneq->uit[count]);
765 }
766 }
767 }
768
769 /*
770 * Generate device unique id that specifies the physical device.
771 */
dasd_eckd_generate_uid(struct dasd_device * device)772 static int dasd_eckd_generate_uid(struct dasd_device *device)
773 {
774 struct dasd_eckd_private *private = device->private;
775 unsigned long flags;
776
777 if (!private)
778 return -ENODEV;
779 if (!private->conf.ned || !private->conf.gneq)
780 return -ENODEV;
781 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
782 create_uid(&private->conf, &private->uid);
783 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
784 return 0;
785 }
786
dasd_eckd_get_uid(struct dasd_device * device,struct dasd_uid * uid)787 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
788 {
789 struct dasd_eckd_private *private = device->private;
790 unsigned long flags;
791
792 if (private) {
793 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
794 *uid = private->uid;
795 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
796 return 0;
797 }
798 return -EINVAL;
799 }
800
801 /*
802 * compare device UID with data of a given dasd_eckd_private structure
803 * return 0 for match
804 */
dasd_eckd_compare_path_uid(struct dasd_device * device,struct dasd_conf * path_conf)805 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
806 struct dasd_conf *path_conf)
807 {
808 struct dasd_uid device_uid;
809 struct dasd_uid path_uid;
810
811 create_uid(path_conf, &path_uid);
812 dasd_eckd_get_uid(device, &device_uid);
813
814 return memcmp(&device_uid, &path_uid, sizeof(struct dasd_uid));
815 }
816
dasd_eckd_fill_rcd_cqr(struct dasd_device * device,struct dasd_ccw_req * cqr,__u8 * rcd_buffer,__u8 lpm)817 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
818 struct dasd_ccw_req *cqr,
819 __u8 *rcd_buffer,
820 __u8 lpm)
821 {
822 struct ccw1 *ccw;
823 /*
824 * buffer has to start with EBCDIC "V1.0" to show
825 * support for virtual device SNEQ
826 */
827 rcd_buffer[0] = 0xE5;
828 rcd_buffer[1] = 0xF1;
829 rcd_buffer[2] = 0x4B;
830 rcd_buffer[3] = 0xF0;
831
832 ccw = cqr->cpaddr;
833 ccw->cmd_code = DASD_ECKD_CCW_RCD;
834 ccw->flags = 0;
835 ccw->cda = (__u32)virt_to_phys(rcd_buffer);
836 ccw->count = DASD_ECKD_RCD_DATA_SIZE;
837 cqr->magic = DASD_ECKD_MAGIC;
838
839 cqr->startdev = device;
840 cqr->memdev = device;
841 cqr->block = NULL;
842 cqr->expires = 10*HZ;
843 cqr->lpm = lpm;
844 cqr->retries = 256;
845 cqr->buildclk = get_tod_clock();
846 cqr->status = DASD_CQR_FILLED;
847 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
848 }
849
850 /*
851 * Wakeup helper for read_conf
852 * if the cqr is not done and needs some error recovery
853 * the buffer has to be re-initialized with the EBCDIC "V1.0"
854 * to show support for virtual device SNEQ
855 */
read_conf_cb(struct dasd_ccw_req * cqr,void * data)856 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
857 {
858 struct ccw1 *ccw;
859 __u8 *rcd_buffer;
860
861 if (cqr->status != DASD_CQR_DONE) {
862 ccw = cqr->cpaddr;
863 rcd_buffer = phys_to_virt(ccw->cda);
864 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
865
866 rcd_buffer[0] = 0xE5;
867 rcd_buffer[1] = 0xF1;
868 rcd_buffer[2] = 0x4B;
869 rcd_buffer[3] = 0xF0;
870 }
871 dasd_wakeup_cb(cqr, data);
872 }
873
dasd_eckd_read_conf_immediately(struct dasd_device * device,struct dasd_ccw_req * cqr,__u8 * rcd_buffer,__u8 lpm)874 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
875 struct dasd_ccw_req *cqr,
876 __u8 *rcd_buffer,
877 __u8 lpm)
878 {
879 struct ciw *ciw;
880 int rc;
881 /*
882 * sanity check: scan for RCD command in extended SenseID data
883 * some devices do not support RCD
884 */
885 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
886 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
887 return -EOPNOTSUPP;
888
889 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
890 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
891 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
892 cqr->retries = 5;
893 cqr->callback = read_conf_cb;
894 rc = dasd_sleep_on_immediatly(cqr);
895 return rc;
896 }
897
dasd_eckd_read_conf_lpm(struct dasd_device * device,void ** rcd_buffer,int * rcd_buffer_size,__u8 lpm)898 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
899 void **rcd_buffer,
900 int *rcd_buffer_size, __u8 lpm)
901 {
902 struct ciw *ciw;
903 char *rcd_buf = NULL;
904 int ret;
905 struct dasd_ccw_req *cqr;
906
907 /*
908 * sanity check: scan for RCD command in extended SenseID data
909 * some devices do not support RCD
910 */
911 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
912 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
913 ret = -EOPNOTSUPP;
914 goto out_error;
915 }
916 rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
917 if (!rcd_buf) {
918 ret = -ENOMEM;
919 goto out_error;
920 }
921 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
922 0, /* use rcd_buf as data ara */
923 device, NULL);
924 if (IS_ERR(cqr)) {
925 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
926 "Could not allocate RCD request");
927 ret = -ENOMEM;
928 goto out_error;
929 }
930 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
931 cqr->callback = read_conf_cb;
932 ret = dasd_sleep_on(cqr);
933 /*
934 * on success we update the user input parms
935 */
936 dasd_sfree_request(cqr, cqr->memdev);
937 if (ret)
938 goto out_error;
939
940 *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
941 *rcd_buffer = rcd_buf;
942 return 0;
943 out_error:
944 kfree(rcd_buf);
945 *rcd_buffer = NULL;
946 *rcd_buffer_size = 0;
947 return ret;
948 }
949
dasd_eckd_identify_conf_parts(struct dasd_conf * conf)950 static int dasd_eckd_identify_conf_parts(struct dasd_conf *conf)
951 {
952
953 struct dasd_sneq *sneq;
954 int i, count;
955
956 conf->ned = NULL;
957 conf->sneq = NULL;
958 conf->vdsneq = NULL;
959 conf->gneq = NULL;
960 count = conf->len / sizeof(struct dasd_sneq);
961 sneq = (struct dasd_sneq *)conf->data;
962 for (i = 0; i < count; ++i) {
963 if (sneq->flags.identifier == 1 && sneq->format == 1)
964 conf->sneq = sneq;
965 else if (sneq->flags.identifier == 1 && sneq->format == 4)
966 conf->vdsneq = (struct vd_sneq *)sneq;
967 else if (sneq->flags.identifier == 2)
968 conf->gneq = (struct dasd_gneq *)sneq;
969 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
970 conf->ned = (struct dasd_ned *)sneq;
971 sneq++;
972 }
973 if (!conf->ned || !conf->gneq) {
974 conf->ned = NULL;
975 conf->sneq = NULL;
976 conf->vdsneq = NULL;
977 conf->gneq = NULL;
978 return -EINVAL;
979 }
980 return 0;
981
982 };
983
dasd_eckd_path_access(void * conf_data,int conf_len)984 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
985 {
986 struct dasd_gneq *gneq;
987 int i, count, found;
988
989 count = conf_len / sizeof(*gneq);
990 gneq = (struct dasd_gneq *)conf_data;
991 found = 0;
992 for (i = 0; i < count; ++i) {
993 if (gneq->flags.identifier == 2) {
994 found = 1;
995 break;
996 }
997 gneq++;
998 }
999 if (found)
1000 return ((char *)gneq)[18] & 0x07;
1001 else
1002 return 0;
1003 }
1004
dasd_eckd_store_conf_data(struct dasd_device * device,struct dasd_conf_data * conf_data,int chp)1005 static void dasd_eckd_store_conf_data(struct dasd_device *device,
1006 struct dasd_conf_data *conf_data, int chp)
1007 {
1008 struct dasd_eckd_private *private = device->private;
1009 struct channel_path_desc_fmt0 *chp_desc;
1010 struct subchannel_id sch_id;
1011 void *cdp;
1012
1013 /*
1014 * path handling and read_conf allocate data
1015 * free it before replacing the pointer
1016 * also replace the old private->conf_data pointer
1017 * with the new one if this points to the same data
1018 */
1019 cdp = device->path[chp].conf_data;
1020 if (private->conf.data == cdp) {
1021 private->conf.data = (void *)conf_data;
1022 dasd_eckd_identify_conf_parts(&private->conf);
1023 }
1024 ccw_device_get_schid(device->cdev, &sch_id);
1025 device->path[chp].conf_data = conf_data;
1026 device->path[chp].cssid = sch_id.cssid;
1027 device->path[chp].ssid = sch_id.ssid;
1028 chp_desc = ccw_device_get_chp_desc(device->cdev, chp);
1029 if (chp_desc)
1030 device->path[chp].chpid = chp_desc->chpid;
1031 kfree(chp_desc);
1032 kfree(cdp);
1033 }
1034
dasd_eckd_clear_conf_data(struct dasd_device * device)1035 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
1036 {
1037 struct dasd_eckd_private *private = device->private;
1038 int i;
1039
1040 private->conf.data = NULL;
1041 private->conf.len = 0;
1042 for (i = 0; i < 8; i++) {
1043 kfree(device->path[i].conf_data);
1044 device->path[i].conf_data = NULL;
1045 device->path[i].cssid = 0;
1046 device->path[i].ssid = 0;
1047 device->path[i].chpid = 0;
1048 dasd_path_notoper(device, i);
1049 }
1050 }
1051
dasd_eckd_read_fc_security(struct dasd_device * device)1052 static void dasd_eckd_read_fc_security(struct dasd_device *device)
1053 {
1054 struct dasd_eckd_private *private = device->private;
1055 u8 esm_valid;
1056 u8 esm[8];
1057 int chp;
1058 int rc;
1059
1060 rc = chsc_scud(private->uid.ssid, (u64 *)esm, &esm_valid);
1061 if (rc) {
1062 for (chp = 0; chp < 8; chp++)
1063 device->path[chp].fc_security = 0;
1064 return;
1065 }
1066
1067 for (chp = 0; chp < 8; chp++) {
1068 if (esm_valid & (0x80 >> chp))
1069 device->path[chp].fc_security = esm[chp];
1070 else
1071 device->path[chp].fc_security = 0;
1072 }
1073 }
1074
dasd_eckd_get_uid_string(struct dasd_conf * conf,char * print_uid)1075 static void dasd_eckd_get_uid_string(struct dasd_conf *conf,
1076 char *print_uid)
1077 {
1078 struct dasd_uid uid;
1079
1080 create_uid(conf, &uid);
1081 if (strlen(uid.vduit) > 0)
1082 snprintf(print_uid, DASD_UID_STRLEN,
1083 "%s.%s.%04x.%02x.%s",
1084 uid.vendor, uid.serial, uid.ssid,
1085 uid.real_unit_addr, uid.vduit);
1086 else
1087 snprintf(print_uid, DASD_UID_STRLEN,
1088 "%s.%s.%04x.%02x",
1089 uid.vendor, uid.serial, uid.ssid,
1090 uid.real_unit_addr);
1091 }
1092
dasd_eckd_check_cabling(struct dasd_device * device,void * conf_data,__u8 lpm)1093 static int dasd_eckd_check_cabling(struct dasd_device *device,
1094 void *conf_data, __u8 lpm)
1095 {
1096 char print_path_uid[DASD_UID_STRLEN], print_device_uid[DASD_UID_STRLEN];
1097 struct dasd_eckd_private *private = device->private;
1098 struct dasd_conf path_conf;
1099
1100 path_conf.data = conf_data;
1101 path_conf.len = DASD_ECKD_RCD_DATA_SIZE;
1102 if (dasd_eckd_identify_conf_parts(&path_conf))
1103 return 1;
1104
1105 if (dasd_eckd_compare_path_uid(device, &path_conf)) {
1106 dasd_eckd_get_uid_string(&path_conf, print_path_uid);
1107 dasd_eckd_get_uid_string(&private->conf, print_device_uid);
1108 dev_err(&device->cdev->dev,
1109 "Not all channel paths lead to the same device, path %02X leads to device %s instead of %s\n",
1110 lpm, print_path_uid, print_device_uid);
1111 return 1;
1112 }
1113
1114 return 0;
1115 }
1116
dasd_eckd_read_conf(struct dasd_device * device)1117 static int dasd_eckd_read_conf(struct dasd_device *device)
1118 {
1119 void *conf_data;
1120 int conf_len, conf_data_saved;
1121 int rc, path_err, pos;
1122 __u8 lpm, opm;
1123 struct dasd_eckd_private *private;
1124
1125 private = device->private;
1126 opm = ccw_device_get_path_mask(device->cdev);
1127 conf_data_saved = 0;
1128 path_err = 0;
1129 /* get configuration data per operational path */
1130 for (lpm = 0x80; lpm; lpm>>= 1) {
1131 if (!(lpm & opm))
1132 continue;
1133 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1134 &conf_len, lpm);
1135 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
1136 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1137 "Read configuration data returned "
1138 "error %d", rc);
1139 return rc;
1140 }
1141 if (conf_data == NULL) {
1142 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1143 "No configuration data "
1144 "retrieved");
1145 /* no further analysis possible */
1146 dasd_path_add_opm(device, opm);
1147 continue; /* no error */
1148 }
1149 /* save first valid configuration data */
1150 if (!conf_data_saved) {
1151 /* initially clear previously stored conf_data */
1152 dasd_eckd_clear_conf_data(device);
1153 private->conf.data = conf_data;
1154 private->conf.len = conf_len;
1155 if (dasd_eckd_identify_conf_parts(&private->conf)) {
1156 private->conf.data = NULL;
1157 private->conf.len = 0;
1158 kfree(conf_data);
1159 continue;
1160 }
1161 /*
1162 * build device UID that other path data
1163 * can be compared to it
1164 */
1165 dasd_eckd_generate_uid(device);
1166 conf_data_saved++;
1167 } else if (dasd_eckd_check_cabling(device, conf_data, lpm)) {
1168 dasd_path_add_cablepm(device, lpm);
1169 path_err = -EINVAL;
1170 kfree(conf_data);
1171 continue;
1172 }
1173
1174 pos = pathmask_to_pos(lpm);
1175 dasd_eckd_store_conf_data(device, conf_data, pos);
1176
1177 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1178 case 0x02:
1179 dasd_path_add_nppm(device, lpm);
1180 break;
1181 case 0x03:
1182 dasd_path_add_ppm(device, lpm);
1183 break;
1184 }
1185 if (!dasd_path_get_opm(device)) {
1186 dasd_path_set_opm(device, lpm);
1187 dasd_generic_path_operational(device);
1188 } else {
1189 dasd_path_add_opm(device, lpm);
1190 }
1191 }
1192
1193 return path_err;
1194 }
1195
get_fcx_max_data(struct dasd_device * device)1196 static u32 get_fcx_max_data(struct dasd_device *device)
1197 {
1198 struct dasd_eckd_private *private = device->private;
1199 int fcx_in_css, fcx_in_gneq, fcx_in_features;
1200 unsigned int mdc;
1201 int tpm;
1202
1203 if (dasd_nofcx)
1204 return 0;
1205 /* is transport mode supported? */
1206 fcx_in_css = css_general_characteristics.fcx;
1207 fcx_in_gneq = private->conf.gneq->reserved2[7] & 0x04;
1208 fcx_in_features = private->features.feature[40] & 0x80;
1209 tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1210
1211 if (!tpm)
1212 return 0;
1213
1214 mdc = ccw_device_get_mdc(device->cdev, 0);
1215 if (mdc == 0) {
1216 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1217 return 0;
1218 } else {
1219 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1220 }
1221 }
1222
verify_fcx_max_data(struct dasd_device * device,__u8 lpm)1223 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1224 {
1225 struct dasd_eckd_private *private = device->private;
1226 unsigned int mdc;
1227 u32 fcx_max_data;
1228
1229 if (private->fcx_max_data) {
1230 mdc = ccw_device_get_mdc(device->cdev, lpm);
1231 if (mdc == 0) {
1232 dev_warn(&device->cdev->dev,
1233 "Detecting the maximum data size for zHPF "
1234 "requests failed (rc=%d) for a new path %x\n",
1235 mdc, lpm);
1236 return mdc;
1237 }
1238 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1239 if (fcx_max_data < private->fcx_max_data) {
1240 dev_warn(&device->cdev->dev,
1241 "The maximum data size for zHPF requests %u "
1242 "on a new path %x is below the active maximum "
1243 "%u\n", fcx_max_data, lpm,
1244 private->fcx_max_data);
1245 return -EACCES;
1246 }
1247 }
1248 return 0;
1249 }
1250
rebuild_device_uid(struct dasd_device * device,struct pe_handler_work_data * data)1251 static int rebuild_device_uid(struct dasd_device *device,
1252 struct pe_handler_work_data *data)
1253 {
1254 struct dasd_eckd_private *private = device->private;
1255 __u8 lpm, opm = dasd_path_get_opm(device);
1256 int rc = -ENODEV;
1257
1258 for (lpm = 0x80; lpm; lpm >>= 1) {
1259 if (!(lpm & opm))
1260 continue;
1261 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1262 memset(&data->cqr, 0, sizeof(data->cqr));
1263 data->cqr.cpaddr = &data->ccw;
1264 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1265 data->rcd_buffer,
1266 lpm);
1267
1268 if (rc) {
1269 if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1270 continue;
1271 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1272 "Read configuration data "
1273 "returned error %d", rc);
1274 break;
1275 }
1276 memcpy(private->conf.data, data->rcd_buffer,
1277 DASD_ECKD_RCD_DATA_SIZE);
1278 if (dasd_eckd_identify_conf_parts(&private->conf)) {
1279 rc = -ENODEV;
1280 } else /* first valid path is enough */
1281 break;
1282 }
1283
1284 if (!rc)
1285 rc = dasd_eckd_generate_uid(device);
1286
1287 return rc;
1288 }
1289
dasd_eckd_path_available_action(struct dasd_device * device,struct pe_handler_work_data * data)1290 static void dasd_eckd_path_available_action(struct dasd_device *device,
1291 struct pe_handler_work_data *data)
1292 {
1293 __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1294 __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1295 struct dasd_conf_data *conf_data;
1296 char print_uid[DASD_UID_STRLEN];
1297 struct dasd_conf path_conf;
1298 unsigned long flags;
1299 int rc, pos;
1300
1301 opm = 0;
1302 npm = 0;
1303 ppm = 0;
1304 epm = 0;
1305 hpfpm = 0;
1306 cablepm = 0;
1307
1308 for (lpm = 0x80; lpm; lpm >>= 1) {
1309 if (!(lpm & data->tbvpm))
1310 continue;
1311 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1312 memset(&data->cqr, 0, sizeof(data->cqr));
1313 data->cqr.cpaddr = &data->ccw;
1314 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1315 data->rcd_buffer,
1316 lpm);
1317 if (!rc) {
1318 switch (dasd_eckd_path_access(data->rcd_buffer,
1319 DASD_ECKD_RCD_DATA_SIZE)
1320 ) {
1321 case 0x02:
1322 npm |= lpm;
1323 break;
1324 case 0x03:
1325 ppm |= lpm;
1326 break;
1327 }
1328 opm |= lpm;
1329 } else if (rc == -EOPNOTSUPP) {
1330 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1331 "path verification: No configuration "
1332 "data retrieved");
1333 opm |= lpm;
1334 } else if (rc == -EAGAIN) {
1335 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1336 "path verification: device is stopped,"
1337 " try again later");
1338 epm |= lpm;
1339 } else {
1340 dev_warn(&device->cdev->dev,
1341 "Reading device feature codes failed "
1342 "(rc=%d) for new path %x\n", rc, lpm);
1343 continue;
1344 }
1345 if (verify_fcx_max_data(device, lpm)) {
1346 opm &= ~lpm;
1347 npm &= ~lpm;
1348 ppm &= ~lpm;
1349 hpfpm |= lpm;
1350 continue;
1351 }
1352
1353 /*
1354 * save conf_data for comparison after
1355 * rebuild_device_uid may have changed
1356 * the original data
1357 */
1358 memcpy(&path_rcd_buf, data->rcd_buffer,
1359 DASD_ECKD_RCD_DATA_SIZE);
1360 path_conf.data = (void *)&path_rcd_buf;
1361 path_conf.len = DASD_ECKD_RCD_DATA_SIZE;
1362 if (dasd_eckd_identify_conf_parts(&path_conf)) {
1363 path_conf.data = NULL;
1364 path_conf.len = 0;
1365 continue;
1366 }
1367
1368 /*
1369 * compare path UID with device UID only if at least
1370 * one valid path is left
1371 * in other case the device UID may have changed and
1372 * the first working path UID will be used as device UID
1373 */
1374 if (dasd_path_get_opm(device) &&
1375 dasd_eckd_compare_path_uid(device, &path_conf)) {
1376 /*
1377 * the comparison was not successful
1378 * rebuild the device UID with at least one
1379 * known path in case a z/VM hyperswap command
1380 * has changed the device
1381 *
1382 * after this compare again
1383 *
1384 * if either the rebuild or the recompare fails
1385 * the path can not be used
1386 */
1387 if (rebuild_device_uid(device, data) ||
1388 dasd_eckd_compare_path_uid(
1389 device, &path_conf)) {
1390 dasd_eckd_get_uid_string(&path_conf, print_uid);
1391 dev_err(&device->cdev->dev,
1392 "The newly added channel path %02X "
1393 "will not be used because it leads "
1394 "to a different device %s\n",
1395 lpm, print_uid);
1396 opm &= ~lpm;
1397 npm &= ~lpm;
1398 ppm &= ~lpm;
1399 cablepm |= lpm;
1400 continue;
1401 }
1402 }
1403
1404 conf_data = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL);
1405 if (conf_data) {
1406 memcpy(conf_data, data->rcd_buffer,
1407 DASD_ECKD_RCD_DATA_SIZE);
1408 } else {
1409 /*
1410 * path is operational but path config data could not
1411 * be stored due to low mem condition
1412 * add it to the error path mask and schedule a path
1413 * verification later that this could be added again
1414 */
1415 epm |= lpm;
1416 }
1417 pos = pathmask_to_pos(lpm);
1418 dasd_eckd_store_conf_data(device, conf_data, pos);
1419
1420 /*
1421 * There is a small chance that a path is lost again between
1422 * above path verification and the following modification of
1423 * the device opm mask. We could avoid that race here by using
1424 * yet another path mask, but we rather deal with this unlikely
1425 * situation in dasd_start_IO.
1426 */
1427 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1428 if (!dasd_path_get_opm(device) && opm) {
1429 dasd_path_set_opm(device, opm);
1430 dasd_generic_path_operational(device);
1431 } else {
1432 dasd_path_add_opm(device, opm);
1433 }
1434 dasd_path_add_nppm(device, npm);
1435 dasd_path_add_ppm(device, ppm);
1436 if (epm) {
1437 dasd_path_add_tbvpm(device, epm);
1438 dasd_device_set_timer(device, 50);
1439 }
1440 dasd_path_add_cablepm(device, cablepm);
1441 dasd_path_add_nohpfpm(device, hpfpm);
1442 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1443
1444 dasd_path_create_kobj(device, pos);
1445 }
1446 }
1447
do_pe_handler_work(struct work_struct * work)1448 static void do_pe_handler_work(struct work_struct *work)
1449 {
1450 struct pe_handler_work_data *data;
1451 struct dasd_device *device;
1452
1453 data = container_of(work, struct pe_handler_work_data, worker);
1454 device = data->device;
1455
1456 /* delay path verification until device was resumed */
1457 if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1458 schedule_work(work);
1459 return;
1460 }
1461 /* check if path verification already running and delay if so */
1462 if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1463 schedule_work(work);
1464 return;
1465 }
1466
1467 if (data->tbvpm)
1468 dasd_eckd_path_available_action(device, data);
1469 if (data->fcsecpm)
1470 dasd_eckd_read_fc_security(device);
1471
1472 clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1473 dasd_put_device(device);
1474 if (data->isglobal)
1475 mutex_unlock(&dasd_pe_handler_mutex);
1476 else
1477 kfree(data);
1478 }
1479
dasd_eckd_pe_handler(struct dasd_device * device,__u8 tbvpm,__u8 fcsecpm)1480 static int dasd_eckd_pe_handler(struct dasd_device *device,
1481 __u8 tbvpm, __u8 fcsecpm)
1482 {
1483 struct pe_handler_work_data *data;
1484
1485 data = kzalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1486 if (!data) {
1487 if (mutex_trylock(&dasd_pe_handler_mutex)) {
1488 data = pe_handler_worker;
1489 data->isglobal = 1;
1490 } else {
1491 return -ENOMEM;
1492 }
1493 }
1494 INIT_WORK(&data->worker, do_pe_handler_work);
1495 dasd_get_device(device);
1496 data->device = device;
1497 data->tbvpm = tbvpm;
1498 data->fcsecpm = fcsecpm;
1499 schedule_work(&data->worker);
1500 return 0;
1501 }
1502
dasd_eckd_reset_path(struct dasd_device * device,__u8 pm)1503 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1504 {
1505 struct dasd_eckd_private *private = device->private;
1506 unsigned long flags;
1507
1508 if (!private->fcx_max_data)
1509 private->fcx_max_data = get_fcx_max_data(device);
1510 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1511 dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1512 dasd_schedule_device_bh(device);
1513 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1514 }
1515
dasd_eckd_read_features(struct dasd_device * device)1516 static int dasd_eckd_read_features(struct dasd_device *device)
1517 {
1518 struct dasd_eckd_private *private = device->private;
1519 struct dasd_psf_prssd_data *prssdp;
1520 struct dasd_rssd_features *features;
1521 struct dasd_ccw_req *cqr;
1522 struct ccw1 *ccw;
1523 int rc;
1524
1525 memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1526 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1527 (sizeof(struct dasd_psf_prssd_data) +
1528 sizeof(struct dasd_rssd_features)),
1529 device, NULL);
1530 if (IS_ERR(cqr)) {
1531 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1532 "allocate initialization request");
1533 return PTR_ERR(cqr);
1534 }
1535 cqr->startdev = device;
1536 cqr->memdev = device;
1537 cqr->block = NULL;
1538 cqr->retries = 256;
1539 cqr->expires = 10 * HZ;
1540
1541 /* Prepare for Read Subsystem Data */
1542 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1543 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1544 prssdp->order = PSF_ORDER_PRSSD;
1545 prssdp->suborder = 0x41; /* Read Feature Codes */
1546 /* all other bytes of prssdp must be zero */
1547
1548 ccw = cqr->cpaddr;
1549 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1550 ccw->count = sizeof(struct dasd_psf_prssd_data);
1551 ccw->flags |= CCW_FLAG_CC;
1552 ccw->cda = (__u32)virt_to_phys(prssdp);
1553
1554 /* Read Subsystem Data - feature codes */
1555 features = (struct dasd_rssd_features *) (prssdp + 1);
1556 memset(features, 0, sizeof(struct dasd_rssd_features));
1557
1558 ccw++;
1559 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1560 ccw->count = sizeof(struct dasd_rssd_features);
1561 ccw->cda = (__u32)virt_to_phys(features);
1562
1563 cqr->buildclk = get_tod_clock();
1564 cqr->status = DASD_CQR_FILLED;
1565 rc = dasd_sleep_on(cqr);
1566 if (rc == 0) {
1567 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1568 features = (struct dasd_rssd_features *) (prssdp + 1);
1569 memcpy(&private->features, features,
1570 sizeof(struct dasd_rssd_features));
1571 } else
1572 dev_warn(&device->cdev->dev, "Reading device feature codes"
1573 " failed with rc=%d\n", rc);
1574 dasd_sfree_request(cqr, cqr->memdev);
1575 return rc;
1576 }
1577
1578 /* Read Volume Information - Volume Storage Query */
dasd_eckd_read_vol_info(struct dasd_device * device)1579 static int dasd_eckd_read_vol_info(struct dasd_device *device)
1580 {
1581 struct dasd_eckd_private *private = device->private;
1582 struct dasd_psf_prssd_data *prssdp;
1583 struct dasd_rssd_vsq *vsq;
1584 struct dasd_ccw_req *cqr;
1585 struct ccw1 *ccw;
1586 int useglobal;
1587 int rc;
1588
1589 /* This command cannot be executed on an alias device */
1590 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1591 private->uid.type == UA_HYPER_PAV_ALIAS)
1592 return 0;
1593
1594 useglobal = 0;
1595 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1596 sizeof(*prssdp) + sizeof(*vsq), device, NULL);
1597 if (IS_ERR(cqr)) {
1598 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1599 "Could not allocate initialization request");
1600 mutex_lock(&dasd_vol_info_mutex);
1601 useglobal = 1;
1602 cqr = &dasd_vol_info_req->cqr;
1603 memset(cqr, 0, sizeof(*cqr));
1604 memset(dasd_vol_info_req, 0, sizeof(*dasd_vol_info_req));
1605 cqr->cpaddr = &dasd_vol_info_req->ccw;
1606 cqr->data = &dasd_vol_info_req->data;
1607 cqr->magic = DASD_ECKD_MAGIC;
1608 }
1609
1610 /* Prepare for Read Subsystem Data */
1611 prssdp = cqr->data;
1612 prssdp->order = PSF_ORDER_PRSSD;
1613 prssdp->suborder = PSF_SUBORDER_VSQ; /* Volume Storage Query */
1614 prssdp->lss = private->conf.ned->ID;
1615 prssdp->volume = private->conf.ned->unit_addr;
1616
1617 ccw = cqr->cpaddr;
1618 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1619 ccw->count = sizeof(*prssdp);
1620 ccw->flags |= CCW_FLAG_CC;
1621 ccw->cda = (__u32)virt_to_phys(prssdp);
1622
1623 /* Read Subsystem Data - Volume Storage Query */
1624 vsq = (struct dasd_rssd_vsq *)(prssdp + 1);
1625 memset(vsq, 0, sizeof(*vsq));
1626
1627 ccw++;
1628 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1629 ccw->count = sizeof(*vsq);
1630 ccw->flags |= CCW_FLAG_SLI;
1631 ccw->cda = (__u32)virt_to_phys(vsq);
1632
1633 cqr->buildclk = get_tod_clock();
1634 cqr->status = DASD_CQR_FILLED;
1635 cqr->startdev = device;
1636 cqr->memdev = device;
1637 cqr->block = NULL;
1638 cqr->retries = 256;
1639 cqr->expires = device->default_expires * HZ;
1640 /* The command might not be supported. Suppress the error output */
1641 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1642
1643 rc = dasd_sleep_on_interruptible(cqr);
1644 if (rc == 0) {
1645 memcpy(&private->vsq, vsq, sizeof(*vsq));
1646 } else {
1647 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1648 "Reading the volume storage information failed with rc=%d", rc);
1649 }
1650
1651 if (useglobal)
1652 mutex_unlock(&dasd_vol_info_mutex);
1653 else
1654 dasd_sfree_request(cqr, cqr->memdev);
1655
1656 return rc;
1657 }
1658
dasd_eckd_is_ese(struct dasd_device * device)1659 static int dasd_eckd_is_ese(struct dasd_device *device)
1660 {
1661 struct dasd_eckd_private *private = device->private;
1662
1663 return private->vsq.vol_info.ese;
1664 }
1665
dasd_eckd_ext_pool_id(struct dasd_device * device)1666 static int dasd_eckd_ext_pool_id(struct dasd_device *device)
1667 {
1668 struct dasd_eckd_private *private = device->private;
1669
1670 return private->vsq.extent_pool_id;
1671 }
1672
1673 /*
1674 * This value represents the total amount of available space. As more space is
1675 * allocated by ESE volumes, this value will decrease.
1676 * The data for this value is therefore updated on any call.
1677 */
dasd_eckd_space_configured(struct dasd_device * device)1678 static int dasd_eckd_space_configured(struct dasd_device *device)
1679 {
1680 struct dasd_eckd_private *private = device->private;
1681 int rc;
1682
1683 rc = dasd_eckd_read_vol_info(device);
1684
1685 return rc ? : private->vsq.space_configured;
1686 }
1687
1688 /*
1689 * The value of space allocated by an ESE volume may have changed and is
1690 * therefore updated on any call.
1691 */
dasd_eckd_space_allocated(struct dasd_device * device)1692 static int dasd_eckd_space_allocated(struct dasd_device *device)
1693 {
1694 struct dasd_eckd_private *private = device->private;
1695 int rc;
1696
1697 rc = dasd_eckd_read_vol_info(device);
1698
1699 return rc ? : private->vsq.space_allocated;
1700 }
1701
dasd_eckd_logical_capacity(struct dasd_device * device)1702 static int dasd_eckd_logical_capacity(struct dasd_device *device)
1703 {
1704 struct dasd_eckd_private *private = device->private;
1705
1706 return private->vsq.logical_capacity;
1707 }
1708
dasd_eckd_ext_pool_exhaust_work(struct work_struct * work)1709 static void dasd_eckd_ext_pool_exhaust_work(struct work_struct *work)
1710 {
1711 struct ext_pool_exhaust_work_data *data;
1712 struct dasd_device *device;
1713 struct dasd_device *base;
1714
1715 data = container_of(work, struct ext_pool_exhaust_work_data, worker);
1716 device = data->device;
1717 base = data->base;
1718
1719 if (!base)
1720 base = device;
1721 if (dasd_eckd_space_configured(base) != 0) {
1722 dasd_generic_space_avail(device);
1723 } else {
1724 dev_warn(&device->cdev->dev, "No space left in the extent pool\n");
1725 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "out of space");
1726 }
1727
1728 dasd_put_device(device);
1729 kfree(data);
1730 }
1731
dasd_eckd_ext_pool_exhaust(struct dasd_device * device,struct dasd_ccw_req * cqr)1732 static int dasd_eckd_ext_pool_exhaust(struct dasd_device *device,
1733 struct dasd_ccw_req *cqr)
1734 {
1735 struct ext_pool_exhaust_work_data *data;
1736
1737 data = kzalloc(sizeof(*data), GFP_ATOMIC);
1738 if (!data)
1739 return -ENOMEM;
1740 INIT_WORK(&data->worker, dasd_eckd_ext_pool_exhaust_work);
1741 dasd_get_device(device);
1742 data->device = device;
1743
1744 if (cqr->block)
1745 data->base = cqr->block->base;
1746 else if (cqr->basedev)
1747 data->base = cqr->basedev;
1748 else
1749 data->base = NULL;
1750
1751 schedule_work(&data->worker);
1752
1753 return 0;
1754 }
1755
dasd_eckd_cpy_ext_pool_data(struct dasd_device * device,struct dasd_rssd_lcq * lcq)1756 static void dasd_eckd_cpy_ext_pool_data(struct dasd_device *device,
1757 struct dasd_rssd_lcq *lcq)
1758 {
1759 struct dasd_eckd_private *private = device->private;
1760 int pool_id = dasd_eckd_ext_pool_id(device);
1761 struct dasd_ext_pool_sum eps;
1762 int i;
1763
1764 for (i = 0; i < lcq->pool_count; i++) {
1765 eps = lcq->ext_pool_sum[i];
1766 if (eps.pool_id == pool_id) {
1767 memcpy(&private->eps, &eps,
1768 sizeof(struct dasd_ext_pool_sum));
1769 }
1770 }
1771 }
1772
1773 /* Read Extent Pool Information - Logical Configuration Query */
dasd_eckd_read_ext_pool_info(struct dasd_device * device)1774 static int dasd_eckd_read_ext_pool_info(struct dasd_device *device)
1775 {
1776 struct dasd_eckd_private *private = device->private;
1777 struct dasd_psf_prssd_data *prssdp;
1778 struct dasd_rssd_lcq *lcq;
1779 struct dasd_ccw_req *cqr;
1780 struct ccw1 *ccw;
1781 int rc;
1782
1783 /* This command cannot be executed on an alias device */
1784 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1785 private->uid.type == UA_HYPER_PAV_ALIAS)
1786 return 0;
1787
1788 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1789 sizeof(*prssdp) + sizeof(*lcq), device, NULL);
1790 if (IS_ERR(cqr)) {
1791 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1792 "Could not allocate initialization request");
1793 return PTR_ERR(cqr);
1794 }
1795
1796 /* Prepare for Read Subsystem Data */
1797 prssdp = cqr->data;
1798 memset(prssdp, 0, sizeof(*prssdp));
1799 prssdp->order = PSF_ORDER_PRSSD;
1800 prssdp->suborder = PSF_SUBORDER_LCQ; /* Logical Configuration Query */
1801
1802 ccw = cqr->cpaddr;
1803 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1804 ccw->count = sizeof(*prssdp);
1805 ccw->flags |= CCW_FLAG_CC;
1806 ccw->cda = (__u32)virt_to_phys(prssdp);
1807
1808 lcq = (struct dasd_rssd_lcq *)(prssdp + 1);
1809 memset(lcq, 0, sizeof(*lcq));
1810
1811 ccw++;
1812 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1813 ccw->count = sizeof(*lcq);
1814 ccw->flags |= CCW_FLAG_SLI;
1815 ccw->cda = (__u32)virt_to_phys(lcq);
1816
1817 cqr->buildclk = get_tod_clock();
1818 cqr->status = DASD_CQR_FILLED;
1819 cqr->startdev = device;
1820 cqr->memdev = device;
1821 cqr->block = NULL;
1822 cqr->retries = 256;
1823 cqr->expires = device->default_expires * HZ;
1824 /* The command might not be supported. Suppress the error output */
1825 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1826
1827 rc = dasd_sleep_on_interruptible(cqr);
1828 if (rc == 0) {
1829 dasd_eckd_cpy_ext_pool_data(device, lcq);
1830 } else {
1831 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1832 "Reading the logical configuration failed with rc=%d", rc);
1833 }
1834
1835 dasd_sfree_request(cqr, cqr->memdev);
1836
1837 return rc;
1838 }
1839
1840 /*
1841 * Depending on the device type, the extent size is specified either as
1842 * cylinders per extent (CKD) or size per extent (FBA)
1843 * A 1GB size corresponds to 1113cyl, and 16MB to 21cyl.
1844 */
dasd_eckd_ext_size(struct dasd_device * device)1845 static int dasd_eckd_ext_size(struct dasd_device *device)
1846 {
1847 struct dasd_eckd_private *private = device->private;
1848 struct dasd_ext_pool_sum eps = private->eps;
1849
1850 if (!eps.flags.extent_size_valid)
1851 return 0;
1852 if (eps.extent_size.size_1G)
1853 return 1113;
1854 if (eps.extent_size.size_16M)
1855 return 21;
1856
1857 return 0;
1858 }
1859
dasd_eckd_ext_pool_warn_thrshld(struct dasd_device * device)1860 static int dasd_eckd_ext_pool_warn_thrshld(struct dasd_device *device)
1861 {
1862 struct dasd_eckd_private *private = device->private;
1863
1864 return private->eps.warn_thrshld;
1865 }
1866
dasd_eckd_ext_pool_cap_at_warnlevel(struct dasd_device * device)1867 static int dasd_eckd_ext_pool_cap_at_warnlevel(struct dasd_device *device)
1868 {
1869 struct dasd_eckd_private *private = device->private;
1870
1871 return private->eps.flags.capacity_at_warnlevel;
1872 }
1873
1874 /*
1875 * Extent Pool out of space
1876 */
dasd_eckd_ext_pool_oos(struct dasd_device * device)1877 static int dasd_eckd_ext_pool_oos(struct dasd_device *device)
1878 {
1879 struct dasd_eckd_private *private = device->private;
1880
1881 return private->eps.flags.pool_oos;
1882 }
1883
1884 /*
1885 * Build CP for Perform Subsystem Function - SSC.
1886 */
dasd_eckd_build_psf_ssc(struct dasd_device * device,int enable_pav)1887 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1888 int enable_pav)
1889 {
1890 struct dasd_ccw_req *cqr;
1891 struct dasd_psf_ssc_data *psf_ssc_data;
1892 struct ccw1 *ccw;
1893
1894 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1895 sizeof(struct dasd_psf_ssc_data),
1896 device, NULL);
1897
1898 if (IS_ERR(cqr)) {
1899 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1900 "Could not allocate PSF-SSC request");
1901 return cqr;
1902 }
1903 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1904 psf_ssc_data->order = PSF_ORDER_SSC;
1905 psf_ssc_data->suborder = 0xc0;
1906 if (enable_pav) {
1907 psf_ssc_data->suborder |= 0x08;
1908 psf_ssc_data->reserved[0] = 0x88;
1909 }
1910 ccw = cqr->cpaddr;
1911 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1912 ccw->cda = (__u32)virt_to_phys(psf_ssc_data);
1913 ccw->count = 66;
1914
1915 cqr->startdev = device;
1916 cqr->memdev = device;
1917 cqr->block = NULL;
1918 cqr->retries = 256;
1919 cqr->expires = 10*HZ;
1920 cqr->buildclk = get_tod_clock();
1921 cqr->status = DASD_CQR_FILLED;
1922 return cqr;
1923 }
1924
1925 /*
1926 * Perform Subsystem Function.
1927 * It is necessary to trigger CIO for channel revalidation since this
1928 * call might change behaviour of DASD devices.
1929 */
1930 static int
dasd_eckd_psf_ssc(struct dasd_device * device,int enable_pav,unsigned long flags)1931 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1932 unsigned long flags)
1933 {
1934 struct dasd_ccw_req *cqr;
1935 int rc;
1936
1937 cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1938 if (IS_ERR(cqr))
1939 return PTR_ERR(cqr);
1940
1941 /*
1942 * set flags e.g. turn on failfast, to prevent blocking
1943 * the calling function should handle failed requests
1944 */
1945 cqr->flags |= flags;
1946
1947 rc = dasd_sleep_on(cqr);
1948 if (!rc)
1949 /* trigger CIO to reprobe devices */
1950 css_schedule_reprobe();
1951 else if (cqr->intrc == -EAGAIN)
1952 rc = -EAGAIN;
1953
1954 dasd_sfree_request(cqr, cqr->memdev);
1955 return rc;
1956 }
1957
1958 /*
1959 * Valide storage server of current device.
1960 */
dasd_eckd_validate_server(struct dasd_device * device,unsigned long flags)1961 static int dasd_eckd_validate_server(struct dasd_device *device,
1962 unsigned long flags)
1963 {
1964 struct dasd_eckd_private *private = device->private;
1965 int enable_pav, rc;
1966
1967 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1968 private->uid.type == UA_HYPER_PAV_ALIAS)
1969 return 0;
1970 if (dasd_nopav || MACHINE_IS_VM)
1971 enable_pav = 0;
1972 else
1973 enable_pav = 1;
1974 rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1975
1976 /* may be requested feature is not available on server,
1977 * therefore just report error and go ahead */
1978 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1979 "returned rc=%d", private->uid.ssid, rc);
1980 return rc;
1981 }
1982
1983 /*
1984 * worker to do a validate server in case of a lost pathgroup
1985 */
dasd_eckd_do_validate_server(struct work_struct * work)1986 static void dasd_eckd_do_validate_server(struct work_struct *work)
1987 {
1988 struct dasd_device *device = container_of(work, struct dasd_device,
1989 kick_validate);
1990 unsigned long flags = 0;
1991
1992 set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1993 if (dasd_eckd_validate_server(device, flags)
1994 == -EAGAIN) {
1995 /* schedule worker again if failed */
1996 schedule_work(&device->kick_validate);
1997 return;
1998 }
1999
2000 dasd_put_device(device);
2001 }
2002
dasd_eckd_kick_validate_server(struct dasd_device * device)2003 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
2004 {
2005 dasd_get_device(device);
2006 /* exit if device not online or in offline processing */
2007 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
2008 device->state < DASD_STATE_ONLINE) {
2009 dasd_put_device(device);
2010 return;
2011 }
2012 /* queue call to do_validate_server to the kernel event daemon. */
2013 if (!schedule_work(&device->kick_validate))
2014 dasd_put_device(device);
2015 }
2016
2017 /*
2018 * return if the device is the copy relation primary if a copy relation is active
2019 */
dasd_device_is_primary(struct dasd_device * device)2020 static int dasd_device_is_primary(struct dasd_device *device)
2021 {
2022 if (!device->copy)
2023 return 1;
2024
2025 if (device->copy->active->device == device)
2026 return 1;
2027
2028 return 0;
2029 }
2030
dasd_eckd_alloc_block(struct dasd_device * device)2031 static int dasd_eckd_alloc_block(struct dasd_device *device)
2032 {
2033 struct dasd_block *block;
2034 struct dasd_uid temp_uid;
2035
2036 if (!dasd_device_is_primary(device))
2037 return 0;
2038
2039 dasd_eckd_get_uid(device, &temp_uid);
2040 if (temp_uid.type == UA_BASE_DEVICE) {
2041 block = dasd_alloc_block();
2042 if (IS_ERR(block)) {
2043 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
2044 "could not allocate dasd block structure");
2045 return PTR_ERR(block);
2046 }
2047 device->block = block;
2048 block->base = device;
2049 }
2050 return 0;
2051 }
2052
dasd_eckd_pprc_enabled(struct dasd_device * device)2053 static bool dasd_eckd_pprc_enabled(struct dasd_device *device)
2054 {
2055 struct dasd_eckd_private *private = device->private;
2056
2057 return private->rdc_data.facilities.PPRC_enabled;
2058 }
2059
2060 /*
2061 * Check device characteristics.
2062 * If the device is accessible using ECKD discipline, the device is enabled.
2063 */
2064 static int
dasd_eckd_check_characteristics(struct dasd_device * device)2065 dasd_eckd_check_characteristics(struct dasd_device *device)
2066 {
2067 struct dasd_eckd_private *private = device->private;
2068 int rc, i;
2069 int readonly;
2070 unsigned long value;
2071
2072 /* setup work queue for validate server*/
2073 INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
2074 /* setup work queue for summary unit check */
2075 INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
2076
2077 if (!ccw_device_is_pathgroup(device->cdev)) {
2078 dev_warn(&device->cdev->dev,
2079 "A channel path group could not be established\n");
2080 return -EIO;
2081 }
2082 if (!ccw_device_is_multipath(device->cdev)) {
2083 dev_info(&device->cdev->dev,
2084 "The DASD is not operating in multipath mode\n");
2085 }
2086 if (!private) {
2087 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
2088 if (!private) {
2089 dev_warn(&device->cdev->dev,
2090 "Allocating memory for private DASD data "
2091 "failed\n");
2092 return -ENOMEM;
2093 }
2094 device->private = private;
2095 } else {
2096 memset(private, 0, sizeof(*private));
2097 }
2098 /* Invalidate status of initial analysis. */
2099 private->init_cqr_status = -1;
2100 /* Set default cache operations. */
2101 private->attrib.operation = DASD_NORMAL_CACHE;
2102 private->attrib.nr_cyl = 0;
2103
2104 /* Read Configuration Data */
2105 rc = dasd_eckd_read_conf(device);
2106 if (rc)
2107 goto out_err1;
2108
2109 /* set some default values */
2110 device->default_expires = DASD_EXPIRES;
2111 device->default_retries = DASD_RETRIES;
2112 device->path_thrhld = DASD_ECKD_PATH_THRHLD;
2113 device->path_interval = DASD_ECKD_PATH_INTERVAL;
2114 device->aq_timeouts = DASD_RETRIES_MAX;
2115
2116 if (private->conf.gneq) {
2117 value = 1;
2118 for (i = 0; i < private->conf.gneq->timeout.value; i++)
2119 value = 10 * value;
2120 value = value * private->conf.gneq->timeout.number;
2121 /* do not accept useless values */
2122 if (value != 0 && value <= DASD_EXPIRES_MAX)
2123 device->default_expires = value;
2124 }
2125
2126 /* Read Device Characteristics */
2127 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
2128 &private->rdc_data, 64);
2129 if (rc) {
2130 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
2131 "Read device characteristic failed, rc=%d", rc);
2132 goto out_err1;
2133 }
2134
2135 /* setup PPRC for device from devmap */
2136 rc = dasd_devmap_set_device_copy_relation(device->cdev,
2137 dasd_eckd_pprc_enabled(device));
2138 if (rc) {
2139 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
2140 "copy relation setup failed, rc=%d", rc);
2141 goto out_err1;
2142 }
2143
2144 /* check if block device is needed and allocate in case */
2145 rc = dasd_eckd_alloc_block(device);
2146 if (rc)
2147 goto out_err1;
2148
2149 /* register lcu with alias handling, enable PAV */
2150 rc = dasd_alias_make_device_known_to_lcu(device);
2151 if (rc)
2152 goto out_err2;
2153
2154 dasd_eckd_validate_server(device, 0);
2155
2156 /* device may report different configuration data after LCU setup */
2157 rc = dasd_eckd_read_conf(device);
2158 if (rc)
2159 goto out_err3;
2160
2161 dasd_eckd_read_fc_security(device);
2162 dasd_path_create_kobjects(device);
2163
2164 /* Read Feature Codes */
2165 dasd_eckd_read_features(device);
2166
2167 /* Read Volume Information */
2168 dasd_eckd_read_vol_info(device);
2169
2170 /* Read Extent Pool Information */
2171 dasd_eckd_read_ext_pool_info(device);
2172
2173 if ((device->features & DASD_FEATURE_USERAW) &&
2174 !(private->rdc_data.facilities.RT_in_LR)) {
2175 dev_err(&device->cdev->dev, "The storage server does not "
2176 "support raw-track access\n");
2177 rc = -EINVAL;
2178 goto out_err3;
2179 }
2180
2181 /* find the valid cylinder size */
2182 if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
2183 private->rdc_data.long_no_cyl)
2184 private->real_cyl = private->rdc_data.long_no_cyl;
2185 else
2186 private->real_cyl = private->rdc_data.no_cyl;
2187
2188 private->fcx_max_data = get_fcx_max_data(device);
2189
2190 readonly = dasd_device_is_ro(device);
2191 if (readonly)
2192 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
2193
2194 dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
2195 "with %d cylinders, %d heads, %d sectors%s\n",
2196 private->rdc_data.dev_type,
2197 private->rdc_data.dev_model,
2198 private->rdc_data.cu_type,
2199 private->rdc_data.cu_model.model,
2200 private->real_cyl,
2201 private->rdc_data.trk_per_cyl,
2202 private->rdc_data.sec_per_trk,
2203 readonly ? ", read-only device" : "");
2204 return 0;
2205
2206 out_err3:
2207 dasd_alias_disconnect_device_from_lcu(device);
2208 out_err2:
2209 dasd_free_block(device->block);
2210 device->block = NULL;
2211 out_err1:
2212 dasd_eckd_clear_conf_data(device);
2213 dasd_path_remove_kobjects(device);
2214 kfree(device->private);
2215 device->private = NULL;
2216 return rc;
2217 }
2218
dasd_eckd_uncheck_device(struct dasd_device * device)2219 static void dasd_eckd_uncheck_device(struct dasd_device *device)
2220 {
2221 struct dasd_eckd_private *private = device->private;
2222
2223 if (!private)
2224 return;
2225
2226 dasd_alias_disconnect_device_from_lcu(device);
2227 private->conf.ned = NULL;
2228 private->conf.sneq = NULL;
2229 private->conf.vdsneq = NULL;
2230 private->conf.gneq = NULL;
2231 dasd_eckd_clear_conf_data(device);
2232 dasd_path_remove_kobjects(device);
2233 }
2234
2235 static struct dasd_ccw_req *
dasd_eckd_analysis_ccw(struct dasd_device * device)2236 dasd_eckd_analysis_ccw(struct dasd_device *device)
2237 {
2238 struct dasd_eckd_private *private = device->private;
2239 struct eckd_count *count_data;
2240 struct LO_eckd_data *LO_data;
2241 struct dasd_ccw_req *cqr;
2242 struct ccw1 *ccw;
2243 int cplength, datasize;
2244 int i;
2245
2246 cplength = 8;
2247 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
2248 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
2249 NULL);
2250 if (IS_ERR(cqr))
2251 return cqr;
2252 ccw = cqr->cpaddr;
2253 /* Define extent for the first 2 tracks. */
2254 define_extent(ccw++, cqr->data, 0, 1,
2255 DASD_ECKD_CCW_READ_COUNT, device, 0);
2256 LO_data = cqr->data + sizeof(struct DE_eckd_data);
2257 /* Locate record for the first 4 records on track 0. */
2258 ccw[-1].flags |= CCW_FLAG_CC;
2259 locate_record(ccw++, LO_data++, 0, 0, 4,
2260 DASD_ECKD_CCW_READ_COUNT, device, 0);
2261
2262 count_data = private->count_area;
2263 for (i = 0; i < 4; i++) {
2264 ccw[-1].flags |= CCW_FLAG_CC;
2265 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2266 ccw->flags = 0;
2267 ccw->count = 8;
2268 ccw->cda = (__u32)virt_to_phys(count_data);
2269 ccw++;
2270 count_data++;
2271 }
2272
2273 /* Locate record for the first record on track 1. */
2274 ccw[-1].flags |= CCW_FLAG_CC;
2275 locate_record(ccw++, LO_data++, 1, 0, 1,
2276 DASD_ECKD_CCW_READ_COUNT, device, 0);
2277 /* Read count ccw. */
2278 ccw[-1].flags |= CCW_FLAG_CC;
2279 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2280 ccw->flags = 0;
2281 ccw->count = 8;
2282 ccw->cda = (__u32)virt_to_phys(count_data);
2283
2284 cqr->block = NULL;
2285 cqr->startdev = device;
2286 cqr->memdev = device;
2287 cqr->retries = 255;
2288 cqr->buildclk = get_tod_clock();
2289 cqr->status = DASD_CQR_FILLED;
2290 /* Set flags to suppress output for expected errors */
2291 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2292 set_bit(DASD_CQR_SUPPRESS_IT, &cqr->flags);
2293
2294 return cqr;
2295 }
2296
2297 /* differentiate between 'no record found' and any other error */
dasd_eckd_analysis_evaluation(struct dasd_ccw_req * init_cqr)2298 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
2299 {
2300 char *sense;
2301 if (init_cqr->status == DASD_CQR_DONE)
2302 return INIT_CQR_OK;
2303 else if (init_cqr->status == DASD_CQR_NEED_ERP ||
2304 init_cqr->status == DASD_CQR_FAILED) {
2305 sense = dasd_get_sense(&init_cqr->irb);
2306 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
2307 return INIT_CQR_UNFORMATTED;
2308 else
2309 return INIT_CQR_ERROR;
2310 } else
2311 return INIT_CQR_ERROR;
2312 }
2313
2314 /*
2315 * This is the callback function for the init_analysis cqr. It saves
2316 * the status of the initial analysis ccw before it frees it and kicks
2317 * the device to continue the startup sequence. This will call
2318 * dasd_eckd_do_analysis again (if the devices has not been marked
2319 * for deletion in the meantime).
2320 */
dasd_eckd_analysis_callback(struct dasd_ccw_req * init_cqr,void * data)2321 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
2322 void *data)
2323 {
2324 struct dasd_device *device = init_cqr->startdev;
2325 struct dasd_eckd_private *private = device->private;
2326
2327 private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
2328 dasd_sfree_request(init_cqr, device);
2329 dasd_kick_device(device);
2330 }
2331
dasd_eckd_start_analysis(struct dasd_block * block)2332 static int dasd_eckd_start_analysis(struct dasd_block *block)
2333 {
2334 struct dasd_ccw_req *init_cqr;
2335
2336 init_cqr = dasd_eckd_analysis_ccw(block->base);
2337 if (IS_ERR(init_cqr))
2338 return PTR_ERR(init_cqr);
2339 init_cqr->callback = dasd_eckd_analysis_callback;
2340 init_cqr->callback_data = NULL;
2341 init_cqr->expires = 5*HZ;
2342 /* first try without ERP, so we can later handle unformatted
2343 * devices as special case
2344 */
2345 clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
2346 init_cqr->retries = 0;
2347 dasd_add_request_head(init_cqr);
2348 return -EAGAIN;
2349 }
2350
dasd_eckd_end_analysis(struct dasd_block * block)2351 static int dasd_eckd_end_analysis(struct dasd_block *block)
2352 {
2353 struct dasd_device *device = block->base;
2354 struct dasd_eckd_private *private = device->private;
2355 struct eckd_count *count_area;
2356 unsigned int sb, blk_per_trk;
2357 int status, i;
2358 struct dasd_ccw_req *init_cqr;
2359
2360 status = private->init_cqr_status;
2361 private->init_cqr_status = -1;
2362 if (status == INIT_CQR_ERROR) {
2363 /* try again, this time with full ERP */
2364 init_cqr = dasd_eckd_analysis_ccw(device);
2365 dasd_sleep_on(init_cqr);
2366 status = dasd_eckd_analysis_evaluation(init_cqr);
2367 dasd_sfree_request(init_cqr, device);
2368 }
2369
2370 if (device->features & DASD_FEATURE_USERAW) {
2371 block->bp_block = DASD_RAW_BLOCKSIZE;
2372 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
2373 block->s2b_shift = 3;
2374 goto raw;
2375 }
2376
2377 if (status == INIT_CQR_UNFORMATTED) {
2378 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
2379 return -EMEDIUMTYPE;
2380 } else if (status == INIT_CQR_ERROR) {
2381 dev_err(&device->cdev->dev,
2382 "Detecting the DASD disk layout failed because "
2383 "of an I/O error\n");
2384 return -EIO;
2385 }
2386
2387 private->uses_cdl = 1;
2388 /* Check Track 0 for Compatible Disk Layout */
2389 count_area = NULL;
2390 for (i = 0; i < 3; i++) {
2391 if (private->count_area[i].kl != 4 ||
2392 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2393 private->count_area[i].cyl != 0 ||
2394 private->count_area[i].head != count_area_head[i] ||
2395 private->count_area[i].record != count_area_rec[i]) {
2396 private->uses_cdl = 0;
2397 break;
2398 }
2399 }
2400 if (i == 3)
2401 count_area = &private->count_area[3];
2402
2403 if (private->uses_cdl == 0) {
2404 for (i = 0; i < 5; i++) {
2405 if ((private->count_area[i].kl != 0) ||
2406 (private->count_area[i].dl !=
2407 private->count_area[0].dl) ||
2408 private->count_area[i].cyl != 0 ||
2409 private->count_area[i].head != count_area_head[i] ||
2410 private->count_area[i].record != count_area_rec[i])
2411 break;
2412 }
2413 if (i == 5)
2414 count_area = &private->count_area[0];
2415 } else {
2416 if (private->count_area[3].record == 1)
2417 dev_warn(&device->cdev->dev,
2418 "Track 0 has no records following the VTOC\n");
2419 }
2420
2421 if (count_area != NULL && count_area->kl == 0) {
2422 /* we found notthing violating our disk layout */
2423 if (dasd_check_blocksize(count_area->dl) == 0)
2424 block->bp_block = count_area->dl;
2425 }
2426 if (block->bp_block == 0) {
2427 dev_warn(&device->cdev->dev,
2428 "The disk layout of the DASD is not supported\n");
2429 return -EMEDIUMTYPE;
2430 }
2431 block->s2b_shift = 0; /* bits to shift 512 to get a block */
2432 for (sb = 512; sb < block->bp_block; sb = sb << 1)
2433 block->s2b_shift++;
2434
2435 blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2436
2437 raw:
2438 block->blocks = ((unsigned long) private->real_cyl *
2439 private->rdc_data.trk_per_cyl *
2440 blk_per_trk);
2441
2442 dev_info(&device->cdev->dev,
2443 "DASD with %u KB/block, %lu KB total size, %u KB/track, "
2444 "%s\n", (block->bp_block >> 10),
2445 (((unsigned long) private->real_cyl *
2446 private->rdc_data.trk_per_cyl *
2447 blk_per_trk * (block->bp_block >> 9)) >> 1),
2448 ((blk_per_trk * block->bp_block) >> 10),
2449 private->uses_cdl ?
2450 "compatible disk layout" : "linux disk layout");
2451
2452 return 0;
2453 }
2454
dasd_eckd_do_analysis(struct dasd_block * block)2455 static int dasd_eckd_do_analysis(struct dasd_block *block)
2456 {
2457 struct dasd_eckd_private *private = block->base->private;
2458
2459 if (private->init_cqr_status < 0)
2460 return dasd_eckd_start_analysis(block);
2461 else
2462 return dasd_eckd_end_analysis(block);
2463 }
2464
dasd_eckd_basic_to_ready(struct dasd_device * device)2465 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2466 {
2467 return dasd_alias_add_device(device);
2468 };
2469
dasd_eckd_online_to_ready(struct dasd_device * device)2470 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2471 {
2472 if (cancel_work_sync(&device->reload_device))
2473 dasd_put_device(device);
2474 if (cancel_work_sync(&device->kick_validate))
2475 dasd_put_device(device);
2476
2477 return 0;
2478 };
2479
dasd_eckd_basic_to_known(struct dasd_device * device)2480 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2481 {
2482 return dasd_alias_remove_device(device);
2483 };
2484
2485 static int
dasd_eckd_fill_geometry(struct dasd_block * block,struct hd_geometry * geo)2486 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2487 {
2488 struct dasd_eckd_private *private = block->base->private;
2489
2490 if (dasd_check_blocksize(block->bp_block) == 0) {
2491 geo->sectors = recs_per_track(&private->rdc_data,
2492 0, block->bp_block);
2493 }
2494 geo->cylinders = private->rdc_data.no_cyl;
2495 geo->heads = private->rdc_data.trk_per_cyl;
2496 return 0;
2497 }
2498
2499 /*
2500 * Build the TCW request for the format check
2501 */
2502 static struct dasd_ccw_req *
dasd_eckd_build_check_tcw(struct dasd_device * base,struct format_data_t * fdata,int enable_pav,struct eckd_count * fmt_buffer,int rpt)2503 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2504 int enable_pav, struct eckd_count *fmt_buffer,
2505 int rpt)
2506 {
2507 struct dasd_eckd_private *start_priv;
2508 struct dasd_device *startdev = NULL;
2509 struct tidaw *last_tidaw = NULL;
2510 struct dasd_ccw_req *cqr;
2511 struct itcw *itcw;
2512 int itcw_size;
2513 int count;
2514 int rc;
2515 int i;
2516
2517 if (enable_pav)
2518 startdev = dasd_alias_get_start_dev(base);
2519
2520 if (!startdev)
2521 startdev = base;
2522
2523 start_priv = startdev->private;
2524
2525 count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2526
2527 /*
2528 * we're adding 'count' amount of tidaw to the itcw.
2529 * calculate the corresponding itcw_size
2530 */
2531 itcw_size = itcw_calc_size(0, count, 0);
2532
2533 cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2534 if (IS_ERR(cqr))
2535 return cqr;
2536
2537 start_priv->count++;
2538
2539 itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2540 if (IS_ERR(itcw)) {
2541 rc = -EINVAL;
2542 goto out_err;
2543 }
2544
2545 cqr->cpaddr = itcw_get_tcw(itcw);
2546 rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2547 DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2548 sizeof(struct eckd_count),
2549 count * sizeof(struct eckd_count), 0, rpt);
2550 if (rc)
2551 goto out_err;
2552
2553 for (i = 0; i < count; i++) {
2554 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2555 sizeof(struct eckd_count));
2556 if (IS_ERR(last_tidaw)) {
2557 rc = -EINVAL;
2558 goto out_err;
2559 }
2560 }
2561
2562 last_tidaw->flags |= TIDAW_FLAGS_LAST;
2563 itcw_finalize(itcw);
2564
2565 cqr->cpmode = 1;
2566 cqr->startdev = startdev;
2567 cqr->memdev = startdev;
2568 cqr->basedev = base;
2569 cqr->retries = startdev->default_retries;
2570 cqr->expires = startdev->default_expires * HZ;
2571 cqr->buildclk = get_tod_clock();
2572 cqr->status = DASD_CQR_FILLED;
2573 /* Set flags to suppress output for expected errors */
2574 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2575
2576 return cqr;
2577
2578 out_err:
2579 dasd_sfree_request(cqr, startdev);
2580
2581 return ERR_PTR(rc);
2582 }
2583
2584 /*
2585 * Build the CCW request for the format check
2586 */
2587 static struct dasd_ccw_req *
dasd_eckd_build_check(struct dasd_device * base,struct format_data_t * fdata,int enable_pav,struct eckd_count * fmt_buffer,int rpt)2588 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2589 int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2590 {
2591 struct dasd_eckd_private *start_priv;
2592 struct dasd_eckd_private *base_priv;
2593 struct dasd_device *startdev = NULL;
2594 struct dasd_ccw_req *cqr;
2595 struct ccw1 *ccw;
2596 void *data;
2597 int cplength, datasize;
2598 int use_prefix;
2599 int count;
2600 int i;
2601
2602 if (enable_pav)
2603 startdev = dasd_alias_get_start_dev(base);
2604
2605 if (!startdev)
2606 startdev = base;
2607
2608 start_priv = startdev->private;
2609 base_priv = base->private;
2610
2611 count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2612
2613 use_prefix = base_priv->features.feature[8] & 0x01;
2614
2615 if (use_prefix) {
2616 cplength = 1;
2617 datasize = sizeof(struct PFX_eckd_data);
2618 } else {
2619 cplength = 2;
2620 datasize = sizeof(struct DE_eckd_data) +
2621 sizeof(struct LO_eckd_data);
2622 }
2623 cplength += count;
2624
2625 cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2626 if (IS_ERR(cqr))
2627 return cqr;
2628
2629 start_priv->count++;
2630 data = cqr->data;
2631 ccw = cqr->cpaddr;
2632
2633 if (use_prefix) {
2634 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2635 DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2636 count, 0, 0);
2637 } else {
2638 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2639 DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2640
2641 data += sizeof(struct DE_eckd_data);
2642 ccw[-1].flags |= CCW_FLAG_CC;
2643
2644 locate_record(ccw++, data, fdata->start_unit, 0, count,
2645 DASD_ECKD_CCW_READ_COUNT, base, 0);
2646 }
2647
2648 for (i = 0; i < count; i++) {
2649 ccw[-1].flags |= CCW_FLAG_CC;
2650 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2651 ccw->flags = CCW_FLAG_SLI;
2652 ccw->count = 8;
2653 ccw->cda = (__u32)virt_to_phys(fmt_buffer);
2654 ccw++;
2655 fmt_buffer++;
2656 }
2657
2658 cqr->startdev = startdev;
2659 cqr->memdev = startdev;
2660 cqr->basedev = base;
2661 cqr->retries = DASD_RETRIES;
2662 cqr->expires = startdev->default_expires * HZ;
2663 cqr->buildclk = get_tod_clock();
2664 cqr->status = DASD_CQR_FILLED;
2665 /* Set flags to suppress output for expected errors */
2666 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2667
2668 return cqr;
2669 }
2670
2671 static struct dasd_ccw_req *
dasd_eckd_build_format(struct dasd_device * base,struct dasd_device * startdev,struct format_data_t * fdata,int enable_pav)2672 dasd_eckd_build_format(struct dasd_device *base, struct dasd_device *startdev,
2673 struct format_data_t *fdata, int enable_pav)
2674 {
2675 struct dasd_eckd_private *base_priv;
2676 struct dasd_eckd_private *start_priv;
2677 struct dasd_ccw_req *fcp;
2678 struct eckd_count *ect;
2679 struct ch_t address;
2680 struct ccw1 *ccw;
2681 void *data;
2682 int rpt;
2683 int cplength, datasize;
2684 int i, j;
2685 int intensity = 0;
2686 int r0_perm;
2687 int nr_tracks;
2688 int use_prefix;
2689
2690 if (enable_pav)
2691 startdev = dasd_alias_get_start_dev(base);
2692
2693 if (!startdev)
2694 startdev = base;
2695
2696 start_priv = startdev->private;
2697 base_priv = base->private;
2698
2699 rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2700
2701 nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2702
2703 /*
2704 * fdata->intensity is a bit string that tells us what to do:
2705 * Bit 0: write record zero
2706 * Bit 1: write home address, currently not supported
2707 * Bit 2: invalidate tracks
2708 * Bit 3: use OS/390 compatible disk layout (cdl)
2709 * Bit 4: do not allow storage subsystem to modify record zero
2710 * Only some bit combinations do make sense.
2711 */
2712 if (fdata->intensity & 0x10) {
2713 r0_perm = 0;
2714 intensity = fdata->intensity & ~0x10;
2715 } else {
2716 r0_perm = 1;
2717 intensity = fdata->intensity;
2718 }
2719
2720 use_prefix = base_priv->features.feature[8] & 0x01;
2721
2722 switch (intensity) {
2723 case 0x00: /* Normal format */
2724 case 0x08: /* Normal format, use cdl. */
2725 cplength = 2 + (rpt*nr_tracks);
2726 if (use_prefix)
2727 datasize = sizeof(struct PFX_eckd_data) +
2728 sizeof(struct LO_eckd_data) +
2729 rpt * nr_tracks * sizeof(struct eckd_count);
2730 else
2731 datasize = sizeof(struct DE_eckd_data) +
2732 sizeof(struct LO_eckd_data) +
2733 rpt * nr_tracks * sizeof(struct eckd_count);
2734 break;
2735 case 0x01: /* Write record zero and format track. */
2736 case 0x09: /* Write record zero and format track, use cdl. */
2737 cplength = 2 + rpt * nr_tracks;
2738 if (use_prefix)
2739 datasize = sizeof(struct PFX_eckd_data) +
2740 sizeof(struct LO_eckd_data) +
2741 sizeof(struct eckd_count) +
2742 rpt * nr_tracks * sizeof(struct eckd_count);
2743 else
2744 datasize = sizeof(struct DE_eckd_data) +
2745 sizeof(struct LO_eckd_data) +
2746 sizeof(struct eckd_count) +
2747 rpt * nr_tracks * sizeof(struct eckd_count);
2748 break;
2749 case 0x04: /* Invalidate track. */
2750 case 0x0c: /* Invalidate track, use cdl. */
2751 cplength = 3;
2752 if (use_prefix)
2753 datasize = sizeof(struct PFX_eckd_data) +
2754 sizeof(struct LO_eckd_data) +
2755 sizeof(struct eckd_count);
2756 else
2757 datasize = sizeof(struct DE_eckd_data) +
2758 sizeof(struct LO_eckd_data) +
2759 sizeof(struct eckd_count);
2760 break;
2761 default:
2762 dev_warn(&startdev->cdev->dev,
2763 "An I/O control call used incorrect flags 0x%x\n",
2764 fdata->intensity);
2765 return ERR_PTR(-EINVAL);
2766 }
2767
2768 fcp = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2769 if (IS_ERR(fcp))
2770 return fcp;
2771
2772 start_priv->count++;
2773 data = fcp->data;
2774 ccw = fcp->cpaddr;
2775
2776 switch (intensity & ~0x08) {
2777 case 0x00: /* Normal format. */
2778 if (use_prefix) {
2779 prefix(ccw++, (struct PFX_eckd_data *) data,
2780 fdata->start_unit, fdata->stop_unit,
2781 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2782 /* grant subsystem permission to format R0 */
2783 if (r0_perm)
2784 ((struct PFX_eckd_data *)data)
2785 ->define_extent.ga_extended |= 0x04;
2786 data += sizeof(struct PFX_eckd_data);
2787 } else {
2788 define_extent(ccw++, (struct DE_eckd_data *) data,
2789 fdata->start_unit, fdata->stop_unit,
2790 DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2791 /* grant subsystem permission to format R0 */
2792 if (r0_perm)
2793 ((struct DE_eckd_data *) data)
2794 ->ga_extended |= 0x04;
2795 data += sizeof(struct DE_eckd_data);
2796 }
2797 ccw[-1].flags |= CCW_FLAG_CC;
2798 locate_record(ccw++, (struct LO_eckd_data *) data,
2799 fdata->start_unit, 0, rpt*nr_tracks,
2800 DASD_ECKD_CCW_WRITE_CKD, base,
2801 fdata->blksize);
2802 data += sizeof(struct LO_eckd_data);
2803 break;
2804 case 0x01: /* Write record zero + format track. */
2805 if (use_prefix) {
2806 prefix(ccw++, (struct PFX_eckd_data *) data,
2807 fdata->start_unit, fdata->stop_unit,
2808 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2809 base, startdev);
2810 data += sizeof(struct PFX_eckd_data);
2811 } else {
2812 define_extent(ccw++, (struct DE_eckd_data *) data,
2813 fdata->start_unit, fdata->stop_unit,
2814 DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2815 data += sizeof(struct DE_eckd_data);
2816 }
2817 ccw[-1].flags |= CCW_FLAG_CC;
2818 locate_record(ccw++, (struct LO_eckd_data *) data,
2819 fdata->start_unit, 0, rpt * nr_tracks + 1,
2820 DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2821 base->block->bp_block);
2822 data += sizeof(struct LO_eckd_data);
2823 break;
2824 case 0x04: /* Invalidate track. */
2825 if (use_prefix) {
2826 prefix(ccw++, (struct PFX_eckd_data *) data,
2827 fdata->start_unit, fdata->stop_unit,
2828 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2829 data += sizeof(struct PFX_eckd_data);
2830 } else {
2831 define_extent(ccw++, (struct DE_eckd_data *) data,
2832 fdata->start_unit, fdata->stop_unit,
2833 DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2834 data += sizeof(struct DE_eckd_data);
2835 }
2836 ccw[-1].flags |= CCW_FLAG_CC;
2837 locate_record(ccw++, (struct LO_eckd_data *) data,
2838 fdata->start_unit, 0, 1,
2839 DASD_ECKD_CCW_WRITE_CKD, base, 8);
2840 data += sizeof(struct LO_eckd_data);
2841 break;
2842 }
2843
2844 for (j = 0; j < nr_tracks; j++) {
2845 /* calculate cylinder and head for the current track */
2846 set_ch_t(&address,
2847 (fdata->start_unit + j) /
2848 base_priv->rdc_data.trk_per_cyl,
2849 (fdata->start_unit + j) %
2850 base_priv->rdc_data.trk_per_cyl);
2851 if (intensity & 0x01) { /* write record zero */
2852 ect = (struct eckd_count *) data;
2853 data += sizeof(struct eckd_count);
2854 ect->cyl = address.cyl;
2855 ect->head = address.head;
2856 ect->record = 0;
2857 ect->kl = 0;
2858 ect->dl = 8;
2859 ccw[-1].flags |= CCW_FLAG_CC;
2860 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2861 ccw->flags = CCW_FLAG_SLI;
2862 ccw->count = 8;
2863 ccw->cda = (__u32)virt_to_phys(ect);
2864 ccw++;
2865 }
2866 if ((intensity & ~0x08) & 0x04) { /* erase track */
2867 ect = (struct eckd_count *) data;
2868 data += sizeof(struct eckd_count);
2869 ect->cyl = address.cyl;
2870 ect->head = address.head;
2871 ect->record = 1;
2872 ect->kl = 0;
2873 ect->dl = 0;
2874 ccw[-1].flags |= CCW_FLAG_CC;
2875 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2876 ccw->flags = CCW_FLAG_SLI;
2877 ccw->count = 8;
2878 ccw->cda = (__u32)virt_to_phys(ect);
2879 } else { /* write remaining records */
2880 for (i = 0; i < rpt; i++) {
2881 ect = (struct eckd_count *) data;
2882 data += sizeof(struct eckd_count);
2883 ect->cyl = address.cyl;
2884 ect->head = address.head;
2885 ect->record = i + 1;
2886 ect->kl = 0;
2887 ect->dl = fdata->blksize;
2888 /*
2889 * Check for special tracks 0-1
2890 * when formatting CDL
2891 */
2892 if ((intensity & 0x08) &&
2893 address.cyl == 0 && address.head == 0) {
2894 if (i < 3) {
2895 ect->kl = 4;
2896 ect->dl = sizes_trk0[i] - 4;
2897 }
2898 }
2899 if ((intensity & 0x08) &&
2900 address.cyl == 0 && address.head == 1) {
2901 ect->kl = 44;
2902 ect->dl = LABEL_SIZE - 44;
2903 }
2904 ccw[-1].flags |= CCW_FLAG_CC;
2905 if (i != 0 || j == 0)
2906 ccw->cmd_code =
2907 DASD_ECKD_CCW_WRITE_CKD;
2908 else
2909 ccw->cmd_code =
2910 DASD_ECKD_CCW_WRITE_CKD_MT;
2911 ccw->flags = CCW_FLAG_SLI;
2912 ccw->count = 8;
2913 ccw->cda = (__u32)virt_to_phys(ect);
2914 ccw++;
2915 }
2916 }
2917 }
2918
2919 fcp->startdev = startdev;
2920 fcp->memdev = startdev;
2921 fcp->basedev = base;
2922 fcp->retries = 256;
2923 fcp->expires = startdev->default_expires * HZ;
2924 fcp->buildclk = get_tod_clock();
2925 fcp->status = DASD_CQR_FILLED;
2926
2927 return fcp;
2928 }
2929
2930 /*
2931 * Wrapper function to build a CCW request depending on input data
2932 */
2933 static struct dasd_ccw_req *
dasd_eckd_format_build_ccw_req(struct dasd_device * base,struct format_data_t * fdata,int enable_pav,int tpm,struct eckd_count * fmt_buffer,int rpt)2934 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2935 struct format_data_t *fdata, int enable_pav,
2936 int tpm, struct eckd_count *fmt_buffer, int rpt)
2937 {
2938 struct dasd_ccw_req *ccw_req;
2939
2940 if (!fmt_buffer) {
2941 ccw_req = dasd_eckd_build_format(base, NULL, fdata, enable_pav);
2942 } else {
2943 if (tpm)
2944 ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2945 enable_pav,
2946 fmt_buffer, rpt);
2947 else
2948 ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2949 fmt_buffer, rpt);
2950 }
2951
2952 return ccw_req;
2953 }
2954
2955 /*
2956 * Sanity checks on format_data
2957 */
dasd_eckd_format_sanity_checks(struct dasd_device * base,struct format_data_t * fdata)2958 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2959 struct format_data_t *fdata)
2960 {
2961 struct dasd_eckd_private *private = base->private;
2962
2963 if (fdata->start_unit >=
2964 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2965 dev_warn(&base->cdev->dev,
2966 "Start track number %u used in formatting is too big\n",
2967 fdata->start_unit);
2968 return -EINVAL;
2969 }
2970 if (fdata->stop_unit >=
2971 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2972 dev_warn(&base->cdev->dev,
2973 "Stop track number %u used in formatting is too big\n",
2974 fdata->stop_unit);
2975 return -EINVAL;
2976 }
2977 if (fdata->start_unit > fdata->stop_unit) {
2978 dev_warn(&base->cdev->dev,
2979 "Start track %u used in formatting exceeds end track\n",
2980 fdata->start_unit);
2981 return -EINVAL;
2982 }
2983 if (dasd_check_blocksize(fdata->blksize) != 0) {
2984 dev_warn(&base->cdev->dev,
2985 "The DASD cannot be formatted with block size %u\n",
2986 fdata->blksize);
2987 return -EINVAL;
2988 }
2989 return 0;
2990 }
2991
2992 /*
2993 * This function will process format_data originally coming from an IOCTL
2994 */
dasd_eckd_format_process_data(struct dasd_device * base,struct format_data_t * fdata,int enable_pav,int tpm,struct eckd_count * fmt_buffer,int rpt,struct irb * irb)2995 static int dasd_eckd_format_process_data(struct dasd_device *base,
2996 struct format_data_t *fdata,
2997 int enable_pav, int tpm,
2998 struct eckd_count *fmt_buffer, int rpt,
2999 struct irb *irb)
3000 {
3001 struct dasd_eckd_private *private = base->private;
3002 struct dasd_ccw_req *cqr, *n;
3003 struct list_head format_queue;
3004 struct dasd_device *device;
3005 char *sense = NULL;
3006 int old_start, old_stop, format_step;
3007 int step, retry;
3008 int rc;
3009
3010 rc = dasd_eckd_format_sanity_checks(base, fdata);
3011 if (rc)
3012 return rc;
3013
3014 INIT_LIST_HEAD(&format_queue);
3015
3016 old_start = fdata->start_unit;
3017 old_stop = fdata->stop_unit;
3018
3019 if (!tpm && fmt_buffer != NULL) {
3020 /* Command Mode / Format Check */
3021 format_step = 1;
3022 } else if (tpm && fmt_buffer != NULL) {
3023 /* Transport Mode / Format Check */
3024 format_step = DASD_CQR_MAX_CCW / rpt;
3025 } else {
3026 /* Normal Formatting */
3027 format_step = DASD_CQR_MAX_CCW /
3028 recs_per_track(&private->rdc_data, 0, fdata->blksize);
3029 }
3030
3031 do {
3032 retry = 0;
3033 while (fdata->start_unit <= old_stop) {
3034 step = fdata->stop_unit - fdata->start_unit + 1;
3035 if (step > format_step) {
3036 fdata->stop_unit =
3037 fdata->start_unit + format_step - 1;
3038 }
3039
3040 cqr = dasd_eckd_format_build_ccw_req(base, fdata,
3041 enable_pav, tpm,
3042 fmt_buffer, rpt);
3043 if (IS_ERR(cqr)) {
3044 rc = PTR_ERR(cqr);
3045 if (rc == -ENOMEM) {
3046 if (list_empty(&format_queue))
3047 goto out;
3048 /*
3049 * not enough memory available, start
3050 * requests retry after first requests
3051 * were finished
3052 */
3053 retry = 1;
3054 break;
3055 }
3056 goto out_err;
3057 }
3058 list_add_tail(&cqr->blocklist, &format_queue);
3059
3060 if (fmt_buffer) {
3061 step = fdata->stop_unit - fdata->start_unit + 1;
3062 fmt_buffer += rpt * step;
3063 }
3064 fdata->start_unit = fdata->stop_unit + 1;
3065 fdata->stop_unit = old_stop;
3066 }
3067
3068 rc = dasd_sleep_on_queue(&format_queue);
3069
3070 out_err:
3071 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
3072 device = cqr->startdev;
3073 private = device->private;
3074
3075 if (cqr->status == DASD_CQR_FAILED) {
3076 /*
3077 * Only get sense data if called by format
3078 * check
3079 */
3080 if (fmt_buffer && irb) {
3081 sense = dasd_get_sense(&cqr->irb);
3082 memcpy(irb, &cqr->irb, sizeof(*irb));
3083 }
3084 rc = -EIO;
3085 }
3086 list_del_init(&cqr->blocklist);
3087 dasd_ffree_request(cqr, device);
3088 private->count--;
3089 }
3090
3091 if (rc && rc != -EIO)
3092 goto out;
3093 if (rc == -EIO) {
3094 /*
3095 * In case fewer than the expected records are on the
3096 * track, we will most likely get a 'No Record Found'
3097 * error (in command mode) or a 'File Protected' error
3098 * (in transport mode). Those particular cases shouldn't
3099 * pass the -EIO to the IOCTL, therefore reset the rc
3100 * and continue.
3101 */
3102 if (sense &&
3103 (sense[1] & SNS1_NO_REC_FOUND ||
3104 sense[1] & SNS1_FILE_PROTECTED))
3105 retry = 1;
3106 else
3107 goto out;
3108 }
3109
3110 } while (retry);
3111
3112 out:
3113 fdata->start_unit = old_start;
3114 fdata->stop_unit = old_stop;
3115
3116 return rc;
3117 }
3118
dasd_eckd_format_device(struct dasd_device * base,struct format_data_t * fdata,int enable_pav)3119 static int dasd_eckd_format_device(struct dasd_device *base,
3120 struct format_data_t *fdata, int enable_pav)
3121 {
3122 return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
3123 0, NULL);
3124 }
3125
test_and_set_format_track(struct dasd_format_entry * to_format,struct dasd_ccw_req * cqr)3126 static bool test_and_set_format_track(struct dasd_format_entry *to_format,
3127 struct dasd_ccw_req *cqr)
3128 {
3129 struct dasd_block *block = cqr->block;
3130 struct dasd_format_entry *format;
3131 unsigned long flags;
3132 bool rc = false;
3133
3134 spin_lock_irqsave(&block->format_lock, flags);
3135 if (cqr->trkcount != atomic_read(&block->trkcount)) {
3136 /*
3137 * The number of formatted tracks has changed after request
3138 * start and we can not tell if the current track was involved.
3139 * To avoid data corruption treat it as if the current track is
3140 * involved
3141 */
3142 rc = true;
3143 goto out;
3144 }
3145 list_for_each_entry(format, &block->format_list, list) {
3146 if (format->track == to_format->track) {
3147 rc = true;
3148 goto out;
3149 }
3150 }
3151 list_add_tail(&to_format->list, &block->format_list);
3152
3153 out:
3154 spin_unlock_irqrestore(&block->format_lock, flags);
3155 return rc;
3156 }
3157
clear_format_track(struct dasd_format_entry * format,struct dasd_block * block)3158 static void clear_format_track(struct dasd_format_entry *format,
3159 struct dasd_block *block)
3160 {
3161 unsigned long flags;
3162
3163 spin_lock_irqsave(&block->format_lock, flags);
3164 atomic_inc(&block->trkcount);
3165 list_del_init(&format->list);
3166 spin_unlock_irqrestore(&block->format_lock, flags);
3167 }
3168
3169 /*
3170 * Callback function to free ESE format requests.
3171 */
dasd_eckd_ese_format_cb(struct dasd_ccw_req * cqr,void * data)3172 static void dasd_eckd_ese_format_cb(struct dasd_ccw_req *cqr, void *data)
3173 {
3174 struct dasd_device *device = cqr->startdev;
3175 struct dasd_eckd_private *private = device->private;
3176 struct dasd_format_entry *format = data;
3177
3178 clear_format_track(format, cqr->basedev->block);
3179 private->count--;
3180 dasd_ffree_request(cqr, device);
3181 }
3182
3183 static struct dasd_ccw_req *
dasd_eckd_ese_format(struct dasd_device * startdev,struct dasd_ccw_req * cqr,struct irb * irb)3184 dasd_eckd_ese_format(struct dasd_device *startdev, struct dasd_ccw_req *cqr,
3185 struct irb *irb)
3186 {
3187 struct dasd_eckd_private *private;
3188 struct dasd_format_entry *format;
3189 struct format_data_t fdata;
3190 unsigned int recs_per_trk;
3191 struct dasd_ccw_req *fcqr;
3192 struct dasd_device *base;
3193 struct dasd_block *block;
3194 unsigned int blksize;
3195 struct request *req;
3196 sector_t first_trk;
3197 sector_t last_trk;
3198 sector_t curr_trk;
3199 int rc;
3200
3201 req = dasd_get_callback_data(cqr);
3202 block = cqr->block;
3203 base = block->base;
3204 private = base->private;
3205 blksize = block->bp_block;
3206 recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3207 format = &startdev->format_entry;
3208
3209 first_trk = blk_rq_pos(req) >> block->s2b_shift;
3210 sector_div(first_trk, recs_per_trk);
3211 last_trk =
3212 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3213 sector_div(last_trk, recs_per_trk);
3214 rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3215 if (rc)
3216 return ERR_PTR(rc);
3217
3218 if (curr_trk < first_trk || curr_trk > last_trk) {
3219 DBF_DEV_EVENT(DBF_WARNING, startdev,
3220 "ESE error track %llu not within range %llu - %llu\n",
3221 curr_trk, first_trk, last_trk);
3222 return ERR_PTR(-EINVAL);
3223 }
3224 format->track = curr_trk;
3225 /* test if track is already in formatting by another thread */
3226 if (test_and_set_format_track(format, cqr)) {
3227 /* this is no real error so do not count down retries */
3228 cqr->retries++;
3229 return ERR_PTR(-EEXIST);
3230 }
3231
3232 fdata.start_unit = curr_trk;
3233 fdata.stop_unit = curr_trk;
3234 fdata.blksize = blksize;
3235 fdata.intensity = private->uses_cdl ? DASD_FMT_INT_COMPAT : 0;
3236
3237 rc = dasd_eckd_format_sanity_checks(base, &fdata);
3238 if (rc)
3239 return ERR_PTR(-EINVAL);
3240
3241 /*
3242 * We're building the request with PAV disabled as we're reusing
3243 * the former startdev.
3244 */
3245 fcqr = dasd_eckd_build_format(base, startdev, &fdata, 0);
3246 if (IS_ERR(fcqr))
3247 return fcqr;
3248
3249 fcqr->callback = dasd_eckd_ese_format_cb;
3250 fcqr->callback_data = (void *) format;
3251
3252 return fcqr;
3253 }
3254
3255 /*
3256 * When data is read from an unformatted area of an ESE volume, this function
3257 * returns zeroed data and thereby mimics a read of zero data.
3258 *
3259 * The first unformatted track is the one that got the NRF error, the address is
3260 * encoded in the sense data.
3261 *
3262 * All tracks before have returned valid data and should not be touched.
3263 * All tracks after the unformatted track might be formatted or not. This is
3264 * currently not known, remember the processed data and return the remainder of
3265 * the request to the blocklayer in __dasd_cleanup_cqr().
3266 */
dasd_eckd_ese_read(struct dasd_ccw_req * cqr,struct irb * irb)3267 static int dasd_eckd_ese_read(struct dasd_ccw_req *cqr, struct irb *irb)
3268 {
3269 struct dasd_eckd_private *private;
3270 sector_t first_trk, last_trk;
3271 sector_t first_blk, last_blk;
3272 unsigned int blksize, off;
3273 unsigned int recs_per_trk;
3274 struct dasd_device *base;
3275 struct req_iterator iter;
3276 struct dasd_block *block;
3277 unsigned int skip_block;
3278 unsigned int blk_count;
3279 struct request *req;
3280 struct bio_vec bv;
3281 sector_t curr_trk;
3282 sector_t end_blk;
3283 char *dst;
3284 int rc;
3285
3286 req = (struct request *) cqr->callback_data;
3287 base = cqr->block->base;
3288 blksize = base->block->bp_block;
3289 block = cqr->block;
3290 private = base->private;
3291 skip_block = 0;
3292 blk_count = 0;
3293
3294 recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3295 first_trk = first_blk = blk_rq_pos(req) >> block->s2b_shift;
3296 sector_div(first_trk, recs_per_trk);
3297 last_trk = last_blk =
3298 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3299 sector_div(last_trk, recs_per_trk);
3300 rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3301 if (rc)
3302 return rc;
3303
3304 /* sanity check if the current track from sense data is valid */
3305 if (curr_trk < first_trk || curr_trk > last_trk) {
3306 DBF_DEV_EVENT(DBF_WARNING, base,
3307 "ESE error track %llu not within range %llu - %llu\n",
3308 curr_trk, first_trk, last_trk);
3309 return -EINVAL;
3310 }
3311
3312 /*
3313 * if not the first track got the NRF error we have to skip over valid
3314 * blocks
3315 */
3316 if (curr_trk != first_trk)
3317 skip_block = curr_trk * recs_per_trk - first_blk;
3318
3319 /* we have no information beyond the current track */
3320 end_blk = (curr_trk + 1) * recs_per_trk;
3321
3322 rq_for_each_segment(bv, req, iter) {
3323 dst = bvec_virt(&bv);
3324 for (off = 0; off < bv.bv_len; off += blksize) {
3325 if (first_blk + blk_count >= end_blk) {
3326 cqr->proc_bytes = blk_count * blksize;
3327 return 0;
3328 }
3329 if (dst && !skip_block)
3330 memset(dst, 0, blksize);
3331 else
3332 skip_block--;
3333 dst += blksize;
3334 blk_count++;
3335 }
3336 }
3337 return 0;
3338 }
3339
3340 /*
3341 * Helper function to count consecutive records of a single track.
3342 */
dasd_eckd_count_records(struct eckd_count * fmt_buffer,int start,int max)3343 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
3344 int max)
3345 {
3346 int head;
3347 int i;
3348
3349 head = fmt_buffer[start].head;
3350
3351 /*
3352 * There are 3 conditions where we stop counting:
3353 * - if data reoccurs (same head and record may reoccur), which may
3354 * happen due to the way DASD_ECKD_CCW_READ_COUNT works
3355 * - when the head changes, because we're iterating over several tracks
3356 * then (DASD_ECKD_CCW_READ_COUNT_MT)
3357 * - when we've reached the end of sensible data in the buffer (the
3358 * record will be 0 then)
3359 */
3360 for (i = start; i < max; i++) {
3361 if (i > start) {
3362 if ((fmt_buffer[i].head == head &&
3363 fmt_buffer[i].record == 1) ||
3364 fmt_buffer[i].head != head ||
3365 fmt_buffer[i].record == 0)
3366 break;
3367 }
3368 }
3369
3370 return i - start;
3371 }
3372
3373 /*
3374 * Evaluate a given range of tracks. Data like number of records, blocksize,
3375 * record ids, and key length are compared with expected data.
3376 *
3377 * If a mismatch occurs, the corresponding error bit is set, as well as
3378 * additional information, depending on the error.
3379 */
dasd_eckd_format_evaluate_tracks(struct eckd_count * fmt_buffer,struct format_check_t * cdata,int rpt_max,int rpt_exp,int trk_per_cyl,int tpm)3380 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
3381 struct format_check_t *cdata,
3382 int rpt_max, int rpt_exp,
3383 int trk_per_cyl, int tpm)
3384 {
3385 struct ch_t geo;
3386 int max_entries;
3387 int count = 0;
3388 int trkcount;
3389 int blksize;
3390 int pos = 0;
3391 int i, j;
3392 int kl;
3393
3394 trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3395 max_entries = trkcount * rpt_max;
3396
3397 for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
3398 /* Calculate the correct next starting position in the buffer */
3399 if (tpm) {
3400 while (fmt_buffer[pos].record == 0 &&
3401 fmt_buffer[pos].dl == 0) {
3402 if (pos++ > max_entries)
3403 break;
3404 }
3405 } else {
3406 if (i != cdata->expect.start_unit)
3407 pos += rpt_max - count;
3408 }
3409
3410 /* Calculate the expected geo values for the current track */
3411 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
3412
3413 /* Count and check number of records */
3414 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
3415
3416 if (count < rpt_exp) {
3417 cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
3418 break;
3419 }
3420 if (count > rpt_exp) {
3421 cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
3422 break;
3423 }
3424
3425 for (j = 0; j < count; j++, pos++) {
3426 blksize = cdata->expect.blksize;
3427 kl = 0;
3428
3429 /*
3430 * Set special values when checking CDL formatted
3431 * devices.
3432 */
3433 if ((cdata->expect.intensity & 0x08) &&
3434 geo.cyl == 0 && geo.head == 0) {
3435 if (j < 3) {
3436 blksize = sizes_trk0[j] - 4;
3437 kl = 4;
3438 }
3439 }
3440 if ((cdata->expect.intensity & 0x08) &&
3441 geo.cyl == 0 && geo.head == 1) {
3442 blksize = LABEL_SIZE - 44;
3443 kl = 44;
3444 }
3445
3446 /* Check blocksize */
3447 if (fmt_buffer[pos].dl != blksize) {
3448 cdata->result = DASD_FMT_ERR_BLKSIZE;
3449 goto out;
3450 }
3451 /* Check if key length is 0 */
3452 if (fmt_buffer[pos].kl != kl) {
3453 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
3454 goto out;
3455 }
3456 /* Check if record_id is correct */
3457 if (fmt_buffer[pos].cyl != geo.cyl ||
3458 fmt_buffer[pos].head != geo.head ||
3459 fmt_buffer[pos].record != (j + 1)) {
3460 cdata->result = DASD_FMT_ERR_RECORD_ID;
3461 goto out;
3462 }
3463 }
3464 }
3465
3466 out:
3467 /*
3468 * In case of no errors, we need to decrease by one
3469 * to get the correct positions.
3470 */
3471 if (!cdata->result) {
3472 i--;
3473 pos--;
3474 }
3475
3476 cdata->unit = i;
3477 cdata->num_records = count;
3478 cdata->rec = fmt_buffer[pos].record;
3479 cdata->blksize = fmt_buffer[pos].dl;
3480 cdata->key_length = fmt_buffer[pos].kl;
3481 }
3482
3483 /*
3484 * Check the format of a range of tracks of a DASD.
3485 */
dasd_eckd_check_device_format(struct dasd_device * base,struct format_check_t * cdata,int enable_pav)3486 static int dasd_eckd_check_device_format(struct dasd_device *base,
3487 struct format_check_t *cdata,
3488 int enable_pav)
3489 {
3490 struct dasd_eckd_private *private = base->private;
3491 struct eckd_count *fmt_buffer;
3492 struct irb irb;
3493 int rpt_max, rpt_exp;
3494 int fmt_buffer_size;
3495 int trk_per_cyl;
3496 int trkcount;
3497 int tpm = 0;
3498 int rc;
3499
3500 trk_per_cyl = private->rdc_data.trk_per_cyl;
3501
3502 /* Get maximum and expected amount of records per track */
3503 rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
3504 rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
3505
3506 trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3507 fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
3508
3509 fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
3510 if (!fmt_buffer)
3511 return -ENOMEM;
3512
3513 /*
3514 * A certain FICON feature subset is needed to operate in transport
3515 * mode. Additionally, the support for transport mode is implicitly
3516 * checked by comparing the buffer size with fcx_max_data. As long as
3517 * the buffer size is smaller we can operate in transport mode and
3518 * process multiple tracks. If not, only one track at once is being
3519 * processed using command mode.
3520 */
3521 if ((private->features.feature[40] & 0x04) &&
3522 fmt_buffer_size <= private->fcx_max_data)
3523 tpm = 1;
3524
3525 rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
3526 tpm, fmt_buffer, rpt_max, &irb);
3527 if (rc && rc != -EIO)
3528 goto out;
3529 if (rc == -EIO) {
3530 /*
3531 * If our first attempt with transport mode enabled comes back
3532 * with an incorrect length error, we're going to retry the
3533 * check with command mode.
3534 */
3535 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
3536 tpm = 0;
3537 rc = dasd_eckd_format_process_data(base, &cdata->expect,
3538 enable_pav, tpm,
3539 fmt_buffer, rpt_max,
3540 &irb);
3541 if (rc)
3542 goto out;
3543 } else {
3544 goto out;
3545 }
3546 }
3547
3548 dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
3549 trk_per_cyl, tpm);
3550
3551 out:
3552 kfree(fmt_buffer);
3553
3554 return rc;
3555 }
3556
dasd_eckd_handle_terminated_request(struct dasd_ccw_req * cqr)3557 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
3558 {
3559 if (cqr->retries < 0) {
3560 cqr->status = DASD_CQR_FAILED;
3561 return;
3562 }
3563 cqr->status = DASD_CQR_FILLED;
3564 if (cqr->block && (cqr->startdev != cqr->block->base)) {
3565 dasd_eckd_reset_ccw_to_base_io(cqr);
3566 cqr->startdev = cqr->block->base;
3567 cqr->lpm = dasd_path_get_opm(cqr->block->base);
3568 }
3569 };
3570
3571 static dasd_erp_fn_t
dasd_eckd_erp_action(struct dasd_ccw_req * cqr)3572 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
3573 {
3574 struct dasd_device *device = (struct dasd_device *) cqr->startdev;
3575 struct ccw_device *cdev = device->cdev;
3576
3577 switch (cdev->id.cu_type) {
3578 case 0x3990:
3579 case 0x2105:
3580 case 0x2107:
3581 case 0x1750:
3582 return dasd_3990_erp_action;
3583 case 0x9343:
3584 case 0x3880:
3585 default:
3586 return dasd_default_erp_action;
3587 }
3588 }
3589
3590 static dasd_erp_fn_t
dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)3591 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
3592 {
3593 return dasd_default_erp_postaction;
3594 }
3595
dasd_eckd_check_for_device_change(struct dasd_device * device,struct dasd_ccw_req * cqr,struct irb * irb)3596 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
3597 struct dasd_ccw_req *cqr,
3598 struct irb *irb)
3599 {
3600 char mask;
3601 char *sense = NULL;
3602 struct dasd_eckd_private *private = device->private;
3603
3604 /* first of all check for state change pending interrupt */
3605 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
3606 if ((scsw_dstat(&irb->scsw) & mask) == mask) {
3607 /*
3608 * for alias only, not in offline processing
3609 * and only if not suspended
3610 */
3611 if (!device->block && private->lcu &&
3612 device->state == DASD_STATE_ONLINE &&
3613 !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3614 !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
3615 /* schedule worker to reload device */
3616 dasd_reload_device(device);
3617 }
3618 dasd_generic_handle_state_change(device);
3619 return;
3620 }
3621
3622 sense = dasd_get_sense(irb);
3623 if (!sense)
3624 return;
3625
3626 /* summary unit check */
3627 if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
3628 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
3629 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
3630 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3631 "eckd suc: device already notified");
3632 return;
3633 }
3634 sense = dasd_get_sense(irb);
3635 if (!sense) {
3636 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3637 "eckd suc: no reason code available");
3638 clear_bit(DASD_FLAG_SUC, &device->flags);
3639 return;
3640
3641 }
3642 private->suc_reason = sense[8];
3643 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
3644 "eckd handle summary unit check: reason",
3645 private->suc_reason);
3646 dasd_get_device(device);
3647 if (!schedule_work(&device->suc_work))
3648 dasd_put_device(device);
3649
3650 return;
3651 }
3652
3653 /* service information message SIM */
3654 if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3655 ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3656 dasd_3990_erp_handle_sim(device, sense);
3657 return;
3658 }
3659
3660 /* loss of device reservation is handled via base devices only
3661 * as alias devices may be used with several bases
3662 */
3663 if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3664 (sense[7] == 0x3F) &&
3665 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3666 test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3667 if (device->features & DASD_FEATURE_FAILONSLCK)
3668 set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3669 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3670 dev_err(&device->cdev->dev,
3671 "The device reservation was lost\n");
3672 }
3673 }
3674
dasd_eckd_ras_sanity_checks(struct dasd_device * device,unsigned int first_trk,unsigned int last_trk)3675 static int dasd_eckd_ras_sanity_checks(struct dasd_device *device,
3676 unsigned int first_trk,
3677 unsigned int last_trk)
3678 {
3679 struct dasd_eckd_private *private = device->private;
3680 unsigned int trks_per_vol;
3681 int rc = 0;
3682
3683 trks_per_vol = private->real_cyl * private->rdc_data.trk_per_cyl;
3684
3685 if (first_trk >= trks_per_vol) {
3686 dev_warn(&device->cdev->dev,
3687 "Start track number %u used in the space release command is too big\n",
3688 first_trk);
3689 rc = -EINVAL;
3690 } else if (last_trk >= trks_per_vol) {
3691 dev_warn(&device->cdev->dev,
3692 "Stop track number %u used in the space release command is too big\n",
3693 last_trk);
3694 rc = -EINVAL;
3695 } else if (first_trk > last_trk) {
3696 dev_warn(&device->cdev->dev,
3697 "Start track %u used in the space release command exceeds the end track\n",
3698 first_trk);
3699 rc = -EINVAL;
3700 }
3701 return rc;
3702 }
3703
3704 /*
3705 * Helper function to count the amount of involved extents within a given range
3706 * with extent alignment in mind.
3707 */
count_exts(unsigned int from,unsigned int to,int trks_per_ext)3708 static int count_exts(unsigned int from, unsigned int to, int trks_per_ext)
3709 {
3710 int cur_pos = 0;
3711 int count = 0;
3712 int tmp;
3713
3714 if (from == to)
3715 return 1;
3716
3717 /* Count first partial extent */
3718 if (from % trks_per_ext != 0) {
3719 tmp = from + trks_per_ext - (from % trks_per_ext) - 1;
3720 if (tmp > to)
3721 tmp = to;
3722 cur_pos = tmp - from + 1;
3723 count++;
3724 }
3725 /* Count full extents */
3726 if (to - (from + cur_pos) + 1 >= trks_per_ext) {
3727 tmp = to - ((to - trks_per_ext + 1) % trks_per_ext);
3728 count += (tmp - (from + cur_pos) + 1) / trks_per_ext;
3729 cur_pos = tmp;
3730 }
3731 /* Count last partial extent */
3732 if (cur_pos < to)
3733 count++;
3734
3735 return count;
3736 }
3737
dasd_in_copy_relation(struct dasd_device * device)3738 static int dasd_in_copy_relation(struct dasd_device *device)
3739 {
3740 struct dasd_pprc_data_sc4 *temp;
3741 int rc;
3742
3743 if (!dasd_eckd_pprc_enabled(device))
3744 return 0;
3745
3746 temp = kzalloc(sizeof(*temp), GFP_KERNEL);
3747 if (!temp)
3748 return -ENOMEM;
3749
3750 rc = dasd_eckd_query_pprc_status(device, temp);
3751 if (!rc)
3752 rc = temp->dev_info[0].state;
3753
3754 kfree(temp);
3755 return rc;
3756 }
3757
3758 /*
3759 * Release allocated space for a given range or an entire volume.
3760 */
3761 static struct dasd_ccw_req *
dasd_eckd_dso_ras(struct dasd_device * device,struct dasd_block * block,struct request * req,unsigned int first_trk,unsigned int last_trk,int by_extent)3762 dasd_eckd_dso_ras(struct dasd_device *device, struct dasd_block *block,
3763 struct request *req, unsigned int first_trk,
3764 unsigned int last_trk, int by_extent)
3765 {
3766 struct dasd_eckd_private *private = device->private;
3767 struct dasd_dso_ras_ext_range *ras_range;
3768 struct dasd_rssd_features *features;
3769 struct dasd_dso_ras_data *ras_data;
3770 u16 heads, beg_head, end_head;
3771 int cur_to_trk, cur_from_trk;
3772 struct dasd_ccw_req *cqr;
3773 u32 beg_cyl, end_cyl;
3774 int copy_relation;
3775 struct ccw1 *ccw;
3776 int trks_per_ext;
3777 size_t ras_size;
3778 size_t size;
3779 int nr_exts;
3780 void *rq;
3781 int i;
3782
3783 if (dasd_eckd_ras_sanity_checks(device, first_trk, last_trk))
3784 return ERR_PTR(-EINVAL);
3785
3786 copy_relation = dasd_in_copy_relation(device);
3787 if (copy_relation < 0)
3788 return ERR_PTR(copy_relation);
3789
3790 rq = req ? blk_mq_rq_to_pdu(req) : NULL;
3791
3792 features = &private->features;
3793
3794 trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3795 nr_exts = 0;
3796 if (by_extent)
3797 nr_exts = count_exts(first_trk, last_trk, trks_per_ext);
3798 ras_size = sizeof(*ras_data);
3799 size = ras_size + (nr_exts * sizeof(*ras_range));
3800
3801 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, size, device, rq);
3802 if (IS_ERR(cqr)) {
3803 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
3804 "Could not allocate RAS request");
3805 return cqr;
3806 }
3807
3808 ras_data = cqr->data;
3809 memset(ras_data, 0, size);
3810
3811 ras_data->order = DSO_ORDER_RAS;
3812 ras_data->flags.vol_type = 0; /* CKD volume */
3813 /* Release specified extents or entire volume */
3814 ras_data->op_flags.by_extent = by_extent;
3815 /*
3816 * This bit guarantees initialisation of tracks within an extent that is
3817 * not fully specified, but is only supported with a certain feature
3818 * subset and for devices not in a copy relation.
3819 */
3820 if (features->feature[56] & 0x01 && !copy_relation)
3821 ras_data->op_flags.guarantee_init = 1;
3822
3823 ras_data->lss = private->conf.ned->ID;
3824 ras_data->dev_addr = private->conf.ned->unit_addr;
3825 ras_data->nr_exts = nr_exts;
3826
3827 if (by_extent) {
3828 heads = private->rdc_data.trk_per_cyl;
3829 cur_from_trk = first_trk;
3830 cur_to_trk = first_trk + trks_per_ext -
3831 (first_trk % trks_per_ext) - 1;
3832 if (cur_to_trk > last_trk)
3833 cur_to_trk = last_trk;
3834 ras_range = (struct dasd_dso_ras_ext_range *)(cqr->data + ras_size);
3835
3836 for (i = 0; i < nr_exts; i++) {
3837 beg_cyl = cur_from_trk / heads;
3838 beg_head = cur_from_trk % heads;
3839 end_cyl = cur_to_trk / heads;
3840 end_head = cur_to_trk % heads;
3841
3842 set_ch_t(&ras_range->beg_ext, beg_cyl, beg_head);
3843 set_ch_t(&ras_range->end_ext, end_cyl, end_head);
3844
3845 cur_from_trk = cur_to_trk + 1;
3846 cur_to_trk = cur_from_trk + trks_per_ext - 1;
3847 if (cur_to_trk > last_trk)
3848 cur_to_trk = last_trk;
3849 ras_range++;
3850 }
3851 }
3852
3853 ccw = cqr->cpaddr;
3854 ccw->cda = (__u32)virt_to_phys(cqr->data);
3855 ccw->cmd_code = DASD_ECKD_CCW_DSO;
3856 ccw->count = size;
3857
3858 cqr->startdev = device;
3859 cqr->memdev = device;
3860 cqr->block = block;
3861 cqr->retries = 256;
3862 cqr->expires = device->default_expires * HZ;
3863 cqr->buildclk = get_tod_clock();
3864 cqr->status = DASD_CQR_FILLED;
3865
3866 return cqr;
3867 }
3868
dasd_eckd_release_space_full(struct dasd_device * device)3869 static int dasd_eckd_release_space_full(struct dasd_device *device)
3870 {
3871 struct dasd_ccw_req *cqr;
3872 int rc;
3873
3874 cqr = dasd_eckd_dso_ras(device, NULL, NULL, 0, 0, 0);
3875 if (IS_ERR(cqr))
3876 return PTR_ERR(cqr);
3877
3878 rc = dasd_sleep_on_interruptible(cqr);
3879
3880 dasd_sfree_request(cqr, cqr->memdev);
3881
3882 return rc;
3883 }
3884
dasd_eckd_release_space_trks(struct dasd_device * device,unsigned int from,unsigned int to)3885 static int dasd_eckd_release_space_trks(struct dasd_device *device,
3886 unsigned int from, unsigned int to)
3887 {
3888 struct dasd_eckd_private *private = device->private;
3889 struct dasd_block *block = device->block;
3890 struct dasd_ccw_req *cqr, *n;
3891 struct list_head ras_queue;
3892 unsigned int device_exts;
3893 int trks_per_ext;
3894 int stop, step;
3895 int cur_pos;
3896 int rc = 0;
3897 int retry;
3898
3899 INIT_LIST_HEAD(&ras_queue);
3900
3901 device_exts = private->real_cyl / dasd_eckd_ext_size(device);
3902 trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3903
3904 /* Make sure device limits are not exceeded */
3905 step = trks_per_ext * min(device_exts, DASD_ECKD_RAS_EXTS_MAX);
3906 cur_pos = from;
3907
3908 do {
3909 retry = 0;
3910 while (cur_pos < to) {
3911 stop = cur_pos + step -
3912 ((cur_pos + step) % trks_per_ext) - 1;
3913 if (stop > to)
3914 stop = to;
3915
3916 cqr = dasd_eckd_dso_ras(device, NULL, NULL, cur_pos, stop, 1);
3917 if (IS_ERR(cqr)) {
3918 rc = PTR_ERR(cqr);
3919 if (rc == -ENOMEM) {
3920 if (list_empty(&ras_queue))
3921 goto out;
3922 retry = 1;
3923 break;
3924 }
3925 goto err_out;
3926 }
3927
3928 spin_lock_irq(&block->queue_lock);
3929 list_add_tail(&cqr->blocklist, &ras_queue);
3930 spin_unlock_irq(&block->queue_lock);
3931 cur_pos = stop + 1;
3932 }
3933
3934 rc = dasd_sleep_on_queue_interruptible(&ras_queue);
3935
3936 err_out:
3937 list_for_each_entry_safe(cqr, n, &ras_queue, blocklist) {
3938 device = cqr->startdev;
3939 private = device->private;
3940
3941 spin_lock_irq(&block->queue_lock);
3942 list_del_init(&cqr->blocklist);
3943 spin_unlock_irq(&block->queue_lock);
3944 dasd_sfree_request(cqr, device);
3945 private->count--;
3946 }
3947 } while (retry);
3948
3949 out:
3950 return rc;
3951 }
3952
dasd_eckd_release_space(struct dasd_device * device,struct format_data_t * rdata)3953 static int dasd_eckd_release_space(struct dasd_device *device,
3954 struct format_data_t *rdata)
3955 {
3956 if (rdata->intensity & DASD_FMT_INT_ESE_FULL)
3957 return dasd_eckd_release_space_full(device);
3958 else if (rdata->intensity == 0)
3959 return dasd_eckd_release_space_trks(device, rdata->start_unit,
3960 rdata->stop_unit);
3961 else
3962 return -EINVAL;
3963 }
3964
dasd_eckd_build_cp_cmd_single(struct dasd_device * startdev,struct dasd_block * block,struct request * req,sector_t first_rec,sector_t last_rec,sector_t first_trk,sector_t last_trk,unsigned int first_offs,unsigned int last_offs,unsigned int blk_per_trk,unsigned int blksize)3965 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3966 struct dasd_device *startdev,
3967 struct dasd_block *block,
3968 struct request *req,
3969 sector_t first_rec,
3970 sector_t last_rec,
3971 sector_t first_trk,
3972 sector_t last_trk,
3973 unsigned int first_offs,
3974 unsigned int last_offs,
3975 unsigned int blk_per_trk,
3976 unsigned int blksize)
3977 {
3978 struct dasd_eckd_private *private;
3979 unsigned long *idaws;
3980 struct LO_eckd_data *LO_data;
3981 struct dasd_ccw_req *cqr;
3982 struct ccw1 *ccw;
3983 struct req_iterator iter;
3984 struct bio_vec bv;
3985 char *dst;
3986 unsigned int off;
3987 int count, cidaw, cplength, datasize;
3988 sector_t recid;
3989 unsigned char cmd, rcmd;
3990 int use_prefix;
3991 struct dasd_device *basedev;
3992
3993 basedev = block->base;
3994 private = basedev->private;
3995 if (rq_data_dir(req) == READ)
3996 cmd = DASD_ECKD_CCW_READ_MT;
3997 else if (rq_data_dir(req) == WRITE)
3998 cmd = DASD_ECKD_CCW_WRITE_MT;
3999 else
4000 return ERR_PTR(-EINVAL);
4001
4002 /* Check struct bio and count the number of blocks for the request. */
4003 count = 0;
4004 cidaw = 0;
4005 rq_for_each_segment(bv, req, iter) {
4006 if (bv.bv_len & (blksize - 1))
4007 /* Eckd can only do full blocks. */
4008 return ERR_PTR(-EINVAL);
4009 count += bv.bv_len >> (block->s2b_shift + 9);
4010 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
4011 cidaw += bv.bv_len >> (block->s2b_shift + 9);
4012 }
4013 /* Paranoia. */
4014 if (count != last_rec - first_rec + 1)
4015 return ERR_PTR(-EINVAL);
4016
4017 /* use the prefix command if available */
4018 use_prefix = private->features.feature[8] & 0x01;
4019 if (use_prefix) {
4020 /* 1x prefix + number of blocks */
4021 cplength = 2 + count;
4022 /* 1x prefix + cidaws*sizeof(long) */
4023 datasize = sizeof(struct PFX_eckd_data) +
4024 sizeof(struct LO_eckd_data) +
4025 cidaw * sizeof(unsigned long);
4026 } else {
4027 /* 1x define extent + 1x locate record + number of blocks */
4028 cplength = 2 + count;
4029 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
4030 datasize = sizeof(struct DE_eckd_data) +
4031 sizeof(struct LO_eckd_data) +
4032 cidaw * sizeof(unsigned long);
4033 }
4034 /* Find out the number of additional locate record ccws for cdl. */
4035 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
4036 if (last_rec >= 2*blk_per_trk)
4037 count = 2*blk_per_trk - first_rec;
4038 cplength += count;
4039 datasize += count*sizeof(struct LO_eckd_data);
4040 }
4041 /* Allocate the ccw request. */
4042 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
4043 startdev, blk_mq_rq_to_pdu(req));
4044 if (IS_ERR(cqr))
4045 return cqr;
4046 ccw = cqr->cpaddr;
4047 /* First ccw is define extent or prefix. */
4048 if (use_prefix) {
4049 if (prefix(ccw++, cqr->data, first_trk,
4050 last_trk, cmd, basedev, startdev) == -EAGAIN) {
4051 /* Clock not in sync and XRC is enabled.
4052 * Try again later.
4053 */
4054 dasd_sfree_request(cqr, startdev);
4055 return ERR_PTR(-EAGAIN);
4056 }
4057 idaws = (unsigned long *) (cqr->data +
4058 sizeof(struct PFX_eckd_data));
4059 } else {
4060 if (define_extent(ccw++, cqr->data, first_trk,
4061 last_trk, cmd, basedev, 0) == -EAGAIN) {
4062 /* Clock not in sync and XRC is enabled.
4063 * Try again later.
4064 */
4065 dasd_sfree_request(cqr, startdev);
4066 return ERR_PTR(-EAGAIN);
4067 }
4068 idaws = (unsigned long *) (cqr->data +
4069 sizeof(struct DE_eckd_data));
4070 }
4071 /* Build locate_record+read/write/ccws. */
4072 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
4073 recid = first_rec;
4074 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
4075 /* Only standard blocks so there is just one locate record. */
4076 ccw[-1].flags |= CCW_FLAG_CC;
4077 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
4078 last_rec - recid + 1, cmd, basedev, blksize);
4079 }
4080 rq_for_each_segment(bv, req, iter) {
4081 dst = bvec_virt(&bv);
4082 if (dasd_page_cache) {
4083 char *copy = kmem_cache_alloc(dasd_page_cache,
4084 GFP_DMA | __GFP_NOWARN);
4085 if (copy && rq_data_dir(req) == WRITE)
4086 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
4087 if (copy)
4088 dst = copy + bv.bv_offset;
4089 }
4090 for (off = 0; off < bv.bv_len; off += blksize) {
4091 sector_t trkid = recid;
4092 unsigned int recoffs = sector_div(trkid, blk_per_trk);
4093 rcmd = cmd;
4094 count = blksize;
4095 /* Locate record for cdl special block ? */
4096 if (private->uses_cdl && recid < 2*blk_per_trk) {
4097 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
4098 rcmd |= 0x8;
4099 count = dasd_eckd_cdl_reclen(recid);
4100 if (count < blksize &&
4101 rq_data_dir(req) == READ)
4102 memset(dst + count, 0xe5,
4103 blksize - count);
4104 }
4105 ccw[-1].flags |= CCW_FLAG_CC;
4106 locate_record(ccw++, LO_data++,
4107 trkid, recoffs + 1,
4108 1, rcmd, basedev, count);
4109 }
4110 /* Locate record for standard blocks ? */
4111 if (private->uses_cdl && recid == 2*blk_per_trk) {
4112 ccw[-1].flags |= CCW_FLAG_CC;
4113 locate_record(ccw++, LO_data++,
4114 trkid, recoffs + 1,
4115 last_rec - recid + 1,
4116 cmd, basedev, count);
4117 }
4118 /* Read/write ccw. */
4119 ccw[-1].flags |= CCW_FLAG_CC;
4120 ccw->cmd_code = rcmd;
4121 ccw->count = count;
4122 if (idal_is_needed(dst, blksize)) {
4123 ccw->cda = (__u32)virt_to_phys(idaws);
4124 ccw->flags = CCW_FLAG_IDA;
4125 idaws = idal_create_words(idaws, dst, blksize);
4126 } else {
4127 ccw->cda = (__u32)virt_to_phys(dst);
4128 ccw->flags = 0;
4129 }
4130 ccw++;
4131 dst += blksize;
4132 recid++;
4133 }
4134 }
4135 if (blk_noretry_request(req) ||
4136 block->base->features & DASD_FEATURE_FAILFAST)
4137 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4138 cqr->startdev = startdev;
4139 cqr->memdev = startdev;
4140 cqr->block = block;
4141 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
4142 cqr->lpm = dasd_path_get_ppm(startdev);
4143 cqr->retries = startdev->default_retries;
4144 cqr->buildclk = get_tod_clock();
4145 cqr->status = DASD_CQR_FILLED;
4146
4147 /* Set flags to suppress output for expected errors */
4148 if (dasd_eckd_is_ese(basedev)) {
4149 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4150 }
4151
4152 return cqr;
4153 }
4154
dasd_eckd_build_cp_cmd_track(struct dasd_device * startdev,struct dasd_block * block,struct request * req,sector_t first_rec,sector_t last_rec,sector_t first_trk,sector_t last_trk,unsigned int first_offs,unsigned int last_offs,unsigned int blk_per_trk,unsigned int blksize)4155 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
4156 struct dasd_device *startdev,
4157 struct dasd_block *block,
4158 struct request *req,
4159 sector_t first_rec,
4160 sector_t last_rec,
4161 sector_t first_trk,
4162 sector_t last_trk,
4163 unsigned int first_offs,
4164 unsigned int last_offs,
4165 unsigned int blk_per_trk,
4166 unsigned int blksize)
4167 {
4168 unsigned long *idaws;
4169 struct dasd_ccw_req *cqr;
4170 struct ccw1 *ccw;
4171 struct req_iterator iter;
4172 struct bio_vec bv;
4173 char *dst, *idaw_dst;
4174 unsigned int cidaw, cplength, datasize;
4175 unsigned int tlf;
4176 sector_t recid;
4177 unsigned char cmd;
4178 struct dasd_device *basedev;
4179 unsigned int trkcount, count, count_to_trk_end;
4180 unsigned int idaw_len, seg_len, part_len, len_to_track_end;
4181 unsigned char new_track, end_idaw;
4182 sector_t trkid;
4183 unsigned int recoffs;
4184
4185 basedev = block->base;
4186 if (rq_data_dir(req) == READ)
4187 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4188 else if (rq_data_dir(req) == WRITE)
4189 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4190 else
4191 return ERR_PTR(-EINVAL);
4192
4193 /* Track based I/O needs IDAWs for each page, and not just for
4194 * 64 bit addresses. We need additional idals for pages
4195 * that get filled from two tracks, so we use the number
4196 * of records as upper limit.
4197 */
4198 cidaw = last_rec - first_rec + 1;
4199 trkcount = last_trk - first_trk + 1;
4200
4201 /* 1x prefix + one read/write ccw per track */
4202 cplength = 1 + trkcount;
4203
4204 datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
4205
4206 /* Allocate the ccw request. */
4207 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
4208 startdev, blk_mq_rq_to_pdu(req));
4209 if (IS_ERR(cqr))
4210 return cqr;
4211 ccw = cqr->cpaddr;
4212 /* transfer length factor: how many bytes to read from the last track */
4213 if (first_trk == last_trk)
4214 tlf = last_offs - first_offs + 1;
4215 else
4216 tlf = last_offs + 1;
4217 tlf *= blksize;
4218
4219 if (prefix_LRE(ccw++, cqr->data, first_trk,
4220 last_trk, cmd, basedev, startdev,
4221 1 /* format */, first_offs + 1,
4222 trkcount, blksize,
4223 tlf) == -EAGAIN) {
4224 /* Clock not in sync and XRC is enabled.
4225 * Try again later.
4226 */
4227 dasd_sfree_request(cqr, startdev);
4228 return ERR_PTR(-EAGAIN);
4229 }
4230
4231 /*
4232 * The translation of request into ccw programs must meet the
4233 * following conditions:
4234 * - all idaws but the first and the last must address full pages
4235 * (or 2K blocks on 31-bit)
4236 * - the scope of a ccw and it's idal ends with the track boundaries
4237 */
4238 idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
4239 recid = first_rec;
4240 new_track = 1;
4241 end_idaw = 0;
4242 len_to_track_end = 0;
4243 idaw_dst = NULL;
4244 idaw_len = 0;
4245 rq_for_each_segment(bv, req, iter) {
4246 dst = bvec_virt(&bv);
4247 seg_len = bv.bv_len;
4248 while (seg_len) {
4249 if (new_track) {
4250 trkid = recid;
4251 recoffs = sector_div(trkid, blk_per_trk);
4252 count_to_trk_end = blk_per_trk - recoffs;
4253 count = min((last_rec - recid + 1),
4254 (sector_t)count_to_trk_end);
4255 len_to_track_end = count * blksize;
4256 ccw[-1].flags |= CCW_FLAG_CC;
4257 ccw->cmd_code = cmd;
4258 ccw->count = len_to_track_end;
4259 ccw->cda = (__u32)virt_to_phys(idaws);
4260 ccw->flags = CCW_FLAG_IDA;
4261 ccw++;
4262 recid += count;
4263 new_track = 0;
4264 /* first idaw for a ccw may start anywhere */
4265 if (!idaw_dst)
4266 idaw_dst = dst;
4267 }
4268 /* If we start a new idaw, we must make sure that it
4269 * starts on an IDA_BLOCK_SIZE boundary.
4270 * If we continue an idaw, we must make sure that the
4271 * current segment begins where the so far accumulated
4272 * idaw ends
4273 */
4274 if (!idaw_dst) {
4275 if ((__u32)virt_to_phys(dst) & (IDA_BLOCK_SIZE - 1)) {
4276 dasd_sfree_request(cqr, startdev);
4277 return ERR_PTR(-ERANGE);
4278 } else
4279 idaw_dst = dst;
4280 }
4281 if ((idaw_dst + idaw_len) != dst) {
4282 dasd_sfree_request(cqr, startdev);
4283 return ERR_PTR(-ERANGE);
4284 }
4285 part_len = min(seg_len, len_to_track_end);
4286 seg_len -= part_len;
4287 dst += part_len;
4288 idaw_len += part_len;
4289 len_to_track_end -= part_len;
4290 /* collected memory area ends on an IDA_BLOCK border,
4291 * -> create an idaw
4292 * idal_create_words will handle cases where idaw_len
4293 * is larger then IDA_BLOCK_SIZE
4294 */
4295 if (!((__u32)virt_to_phys(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE - 1)))
4296 end_idaw = 1;
4297 /* We also need to end the idaw at track end */
4298 if (!len_to_track_end) {
4299 new_track = 1;
4300 end_idaw = 1;
4301 }
4302 if (end_idaw) {
4303 idaws = idal_create_words(idaws, idaw_dst,
4304 idaw_len);
4305 idaw_dst = NULL;
4306 idaw_len = 0;
4307 end_idaw = 0;
4308 }
4309 }
4310 }
4311
4312 if (blk_noretry_request(req) ||
4313 block->base->features & DASD_FEATURE_FAILFAST)
4314 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4315 cqr->startdev = startdev;
4316 cqr->memdev = startdev;
4317 cqr->block = block;
4318 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
4319 cqr->lpm = dasd_path_get_ppm(startdev);
4320 cqr->retries = startdev->default_retries;
4321 cqr->buildclk = get_tod_clock();
4322 cqr->status = DASD_CQR_FILLED;
4323
4324 /* Set flags to suppress output for expected errors */
4325 if (dasd_eckd_is_ese(basedev))
4326 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4327
4328 return cqr;
4329 }
4330
prepare_itcw(struct itcw * itcw,unsigned int trk,unsigned int totrk,int cmd,struct dasd_device * basedev,struct dasd_device * startdev,unsigned int rec_on_trk,int count,unsigned int blksize,unsigned int total_data_size,unsigned int tlf,unsigned int blk_per_trk)4331 static int prepare_itcw(struct itcw *itcw,
4332 unsigned int trk, unsigned int totrk, int cmd,
4333 struct dasd_device *basedev,
4334 struct dasd_device *startdev,
4335 unsigned int rec_on_trk, int count,
4336 unsigned int blksize,
4337 unsigned int total_data_size,
4338 unsigned int tlf,
4339 unsigned int blk_per_trk)
4340 {
4341 struct PFX_eckd_data pfxdata;
4342 struct dasd_eckd_private *basepriv, *startpriv;
4343 struct DE_eckd_data *dedata;
4344 struct LRE_eckd_data *lredata;
4345 struct dcw *dcw;
4346
4347 u32 begcyl, endcyl;
4348 u16 heads, beghead, endhead;
4349 u8 pfx_cmd;
4350
4351 int rc = 0;
4352 int sector = 0;
4353 int dn, d;
4354
4355
4356 /* setup prefix data */
4357 basepriv = basedev->private;
4358 startpriv = startdev->private;
4359 dedata = &pfxdata.define_extent;
4360 lredata = &pfxdata.locate_record;
4361
4362 memset(&pfxdata, 0, sizeof(pfxdata));
4363 pfxdata.format = 1; /* PFX with LRE */
4364 pfxdata.base_address = basepriv->conf.ned->unit_addr;
4365 pfxdata.base_lss = basepriv->conf.ned->ID;
4366 pfxdata.validity.define_extent = 1;
4367
4368 /* private uid is kept up to date, conf_data may be outdated */
4369 if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
4370 pfxdata.validity.verify_base = 1;
4371
4372 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
4373 pfxdata.validity.verify_base = 1;
4374 pfxdata.validity.hyper_pav = 1;
4375 }
4376
4377 switch (cmd) {
4378 case DASD_ECKD_CCW_READ_TRACK_DATA:
4379 dedata->mask.perm = 0x1;
4380 dedata->attributes.operation = basepriv->attrib.operation;
4381 dedata->blk_size = blksize;
4382 dedata->ga_extended |= 0x42;
4383 lredata->operation.orientation = 0x0;
4384 lredata->operation.operation = 0x0C;
4385 lredata->auxiliary.check_bytes = 0x01;
4386 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4387 break;
4388 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
4389 dedata->mask.perm = 0x02;
4390 dedata->attributes.operation = basepriv->attrib.operation;
4391 dedata->blk_size = blksize;
4392 rc = set_timestamp(NULL, dedata, basedev);
4393 dedata->ga_extended |= 0x42;
4394 lredata->operation.orientation = 0x0;
4395 lredata->operation.operation = 0x3F;
4396 lredata->extended_operation = 0x23;
4397 lredata->auxiliary.check_bytes = 0x2;
4398 /*
4399 * If XRC is supported the System Time Stamp is set. The
4400 * validity of the time stamp must be reflected in the prefix
4401 * data as well.
4402 */
4403 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
4404 pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
4405 pfx_cmd = DASD_ECKD_CCW_PFX;
4406 break;
4407 case DASD_ECKD_CCW_READ_COUNT_MT:
4408 dedata->mask.perm = 0x1;
4409 dedata->attributes.operation = DASD_BYPASS_CACHE;
4410 dedata->ga_extended |= 0x42;
4411 dedata->blk_size = blksize;
4412 lredata->operation.orientation = 0x2;
4413 lredata->operation.operation = 0x16;
4414 lredata->auxiliary.check_bytes = 0x01;
4415 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4416 break;
4417 default:
4418 DBF_DEV_EVENT(DBF_ERR, basedev,
4419 "prepare itcw, unknown opcode 0x%x", cmd);
4420 BUG();
4421 break;
4422 }
4423 if (rc)
4424 return rc;
4425
4426 dedata->attributes.mode = 0x3; /* ECKD */
4427
4428 heads = basepriv->rdc_data.trk_per_cyl;
4429 begcyl = trk / heads;
4430 beghead = trk % heads;
4431 endcyl = totrk / heads;
4432 endhead = totrk % heads;
4433
4434 /* check for sequential prestage - enhance cylinder range */
4435 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
4436 dedata->attributes.operation == DASD_SEQ_ACCESS) {
4437
4438 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
4439 endcyl += basepriv->attrib.nr_cyl;
4440 else
4441 endcyl = (basepriv->real_cyl - 1);
4442 }
4443
4444 set_ch_t(&dedata->beg_ext, begcyl, beghead);
4445 set_ch_t(&dedata->end_ext, endcyl, endhead);
4446
4447 dedata->ep_format = 0x20; /* records per track is valid */
4448 dedata->ep_rec_per_track = blk_per_trk;
4449
4450 if (rec_on_trk) {
4451 switch (basepriv->rdc_data.dev_type) {
4452 case 0x3390:
4453 dn = ceil_quot(blksize + 6, 232);
4454 d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
4455 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
4456 break;
4457 case 0x3380:
4458 d = 7 + ceil_quot(blksize + 12, 32);
4459 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
4460 break;
4461 }
4462 }
4463
4464 if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
4465 lredata->auxiliary.length_valid = 0;
4466 lredata->auxiliary.length_scope = 0;
4467 lredata->sector = 0xff;
4468 } else {
4469 lredata->auxiliary.length_valid = 1;
4470 lredata->auxiliary.length_scope = 1;
4471 lredata->sector = sector;
4472 }
4473 lredata->auxiliary.imbedded_ccw_valid = 1;
4474 lredata->length = tlf;
4475 lredata->imbedded_ccw = cmd;
4476 lredata->count = count;
4477 set_ch_t(&lredata->seek_addr, begcyl, beghead);
4478 lredata->search_arg.cyl = lredata->seek_addr.cyl;
4479 lredata->search_arg.head = lredata->seek_addr.head;
4480 lredata->search_arg.record = rec_on_trk;
4481
4482 dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
4483 &pfxdata, sizeof(pfxdata), total_data_size);
4484 return PTR_ERR_OR_ZERO(dcw);
4485 }
4486
dasd_eckd_build_cp_tpm_track(struct dasd_device * startdev,struct dasd_block * block,struct request * req,sector_t first_rec,sector_t last_rec,sector_t first_trk,sector_t last_trk,unsigned int first_offs,unsigned int last_offs,unsigned int blk_per_trk,unsigned int blksize)4487 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
4488 struct dasd_device *startdev,
4489 struct dasd_block *block,
4490 struct request *req,
4491 sector_t first_rec,
4492 sector_t last_rec,
4493 sector_t first_trk,
4494 sector_t last_trk,
4495 unsigned int first_offs,
4496 unsigned int last_offs,
4497 unsigned int blk_per_trk,
4498 unsigned int blksize)
4499 {
4500 struct dasd_ccw_req *cqr;
4501 struct req_iterator iter;
4502 struct bio_vec bv;
4503 char *dst;
4504 unsigned int trkcount, ctidaw;
4505 unsigned char cmd;
4506 struct dasd_device *basedev;
4507 unsigned int tlf;
4508 struct itcw *itcw;
4509 struct tidaw *last_tidaw = NULL;
4510 int itcw_op;
4511 size_t itcw_size;
4512 u8 tidaw_flags;
4513 unsigned int seg_len, part_len, len_to_track_end;
4514 unsigned char new_track;
4515 sector_t recid, trkid;
4516 unsigned int offs;
4517 unsigned int count, count_to_trk_end;
4518 int ret;
4519
4520 basedev = block->base;
4521 if (rq_data_dir(req) == READ) {
4522 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4523 itcw_op = ITCW_OP_READ;
4524 } else if (rq_data_dir(req) == WRITE) {
4525 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4526 itcw_op = ITCW_OP_WRITE;
4527 } else
4528 return ERR_PTR(-EINVAL);
4529
4530 /* trackbased I/O needs address all memory via TIDAWs,
4531 * not just for 64 bit addresses. This allows us to map
4532 * each segment directly to one tidaw.
4533 * In the case of write requests, additional tidaws may
4534 * be needed when a segment crosses a track boundary.
4535 */
4536 trkcount = last_trk - first_trk + 1;
4537 ctidaw = 0;
4538 rq_for_each_segment(bv, req, iter) {
4539 ++ctidaw;
4540 }
4541 if (rq_data_dir(req) == WRITE)
4542 ctidaw += (last_trk - first_trk);
4543
4544 /* Allocate the ccw request. */
4545 itcw_size = itcw_calc_size(0, ctidaw, 0);
4546 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
4547 blk_mq_rq_to_pdu(req));
4548 if (IS_ERR(cqr))
4549 return cqr;
4550
4551 /* transfer length factor: how many bytes to read from the last track */
4552 if (first_trk == last_trk)
4553 tlf = last_offs - first_offs + 1;
4554 else
4555 tlf = last_offs + 1;
4556 tlf *= blksize;
4557
4558 itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
4559 if (IS_ERR(itcw)) {
4560 ret = -EINVAL;
4561 goto out_error;
4562 }
4563 cqr->cpaddr = itcw_get_tcw(itcw);
4564 if (prepare_itcw(itcw, first_trk, last_trk,
4565 cmd, basedev, startdev,
4566 first_offs + 1,
4567 trkcount, blksize,
4568 (last_rec - first_rec + 1) * blksize,
4569 tlf, blk_per_trk) == -EAGAIN) {
4570 /* Clock not in sync and XRC is enabled.
4571 * Try again later.
4572 */
4573 ret = -EAGAIN;
4574 goto out_error;
4575 }
4576 len_to_track_end = 0;
4577 /*
4578 * A tidaw can address 4k of memory, but must not cross page boundaries
4579 * We can let the block layer handle this by setting
4580 * blk_queue_segment_boundary to page boundaries and
4581 * blk_max_segment_size to page size when setting up the request queue.
4582 * For write requests, a TIDAW must not cross track boundaries, because
4583 * we have to set the CBC flag on the last tidaw for each track.
4584 */
4585 if (rq_data_dir(req) == WRITE) {
4586 new_track = 1;
4587 recid = first_rec;
4588 rq_for_each_segment(bv, req, iter) {
4589 dst = bvec_virt(&bv);
4590 seg_len = bv.bv_len;
4591 while (seg_len) {
4592 if (new_track) {
4593 trkid = recid;
4594 offs = sector_div(trkid, blk_per_trk);
4595 count_to_trk_end = blk_per_trk - offs;
4596 count = min((last_rec - recid + 1),
4597 (sector_t)count_to_trk_end);
4598 len_to_track_end = count * blksize;
4599 recid += count;
4600 new_track = 0;
4601 }
4602 part_len = min(seg_len, len_to_track_end);
4603 seg_len -= part_len;
4604 len_to_track_end -= part_len;
4605 /* We need to end the tidaw at track end */
4606 if (!len_to_track_end) {
4607 new_track = 1;
4608 tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
4609 } else
4610 tidaw_flags = 0;
4611 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
4612 dst, part_len);
4613 if (IS_ERR(last_tidaw)) {
4614 ret = -EINVAL;
4615 goto out_error;
4616 }
4617 dst += part_len;
4618 }
4619 }
4620 } else {
4621 rq_for_each_segment(bv, req, iter) {
4622 dst = bvec_virt(&bv);
4623 last_tidaw = itcw_add_tidaw(itcw, 0x00,
4624 dst, bv.bv_len);
4625 if (IS_ERR(last_tidaw)) {
4626 ret = -EINVAL;
4627 goto out_error;
4628 }
4629 }
4630 }
4631 last_tidaw->flags |= TIDAW_FLAGS_LAST;
4632 last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
4633 itcw_finalize(itcw);
4634
4635 if (blk_noretry_request(req) ||
4636 block->base->features & DASD_FEATURE_FAILFAST)
4637 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4638 cqr->cpmode = 1;
4639 cqr->startdev = startdev;
4640 cqr->memdev = startdev;
4641 cqr->block = block;
4642 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
4643 cqr->lpm = dasd_path_get_ppm(startdev);
4644 cqr->retries = startdev->default_retries;
4645 cqr->buildclk = get_tod_clock();
4646 cqr->status = DASD_CQR_FILLED;
4647
4648 /* Set flags to suppress output for expected errors */
4649 if (dasd_eckd_is_ese(basedev)) {
4650 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4651 set_bit(DASD_CQR_SUPPRESS_IT, &cqr->flags);
4652 }
4653
4654 return cqr;
4655 out_error:
4656 dasd_sfree_request(cqr, startdev);
4657 return ERR_PTR(ret);
4658 }
4659
dasd_eckd_build_cp(struct dasd_device * startdev,struct dasd_block * block,struct request * req)4660 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
4661 struct dasd_block *block,
4662 struct request *req)
4663 {
4664 int cmdrtd, cmdwtd;
4665 int use_prefix;
4666 int fcx_multitrack;
4667 struct dasd_eckd_private *private;
4668 struct dasd_device *basedev;
4669 sector_t first_rec, last_rec;
4670 sector_t first_trk, last_trk;
4671 unsigned int first_offs, last_offs;
4672 unsigned int blk_per_trk, blksize;
4673 int cdlspecial;
4674 unsigned int data_size;
4675 struct dasd_ccw_req *cqr;
4676
4677 basedev = block->base;
4678 private = basedev->private;
4679
4680 /* Calculate number of blocks/records per track. */
4681 blksize = block->bp_block;
4682 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4683 if (blk_per_trk == 0)
4684 return ERR_PTR(-EINVAL);
4685 /* Calculate record id of first and last block. */
4686 first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
4687 first_offs = sector_div(first_trk, blk_per_trk);
4688 last_rec = last_trk =
4689 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
4690 last_offs = sector_div(last_trk, blk_per_trk);
4691 cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
4692
4693 fcx_multitrack = private->features.feature[40] & 0x20;
4694 data_size = blk_rq_bytes(req);
4695 if (data_size % blksize)
4696 return ERR_PTR(-EINVAL);
4697 /* tpm write request add CBC data on each track boundary */
4698 if (rq_data_dir(req) == WRITE)
4699 data_size += (last_trk - first_trk) * 4;
4700
4701 /* is read track data and write track data in command mode supported? */
4702 cmdrtd = private->features.feature[9] & 0x20;
4703 cmdwtd = private->features.feature[12] & 0x40;
4704 use_prefix = private->features.feature[8] & 0x01;
4705
4706 cqr = NULL;
4707 if (cdlspecial || dasd_page_cache) {
4708 /* do nothing, just fall through to the cmd mode single case */
4709 } else if ((data_size <= private->fcx_max_data)
4710 && (fcx_multitrack || (first_trk == last_trk))) {
4711 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
4712 first_rec, last_rec,
4713 first_trk, last_trk,
4714 first_offs, last_offs,
4715 blk_per_trk, blksize);
4716 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4717 (PTR_ERR(cqr) != -ENOMEM))
4718 cqr = NULL;
4719 } else if (use_prefix &&
4720 (((rq_data_dir(req) == READ) && cmdrtd) ||
4721 ((rq_data_dir(req) == WRITE) && cmdwtd))) {
4722 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
4723 first_rec, last_rec,
4724 first_trk, last_trk,
4725 first_offs, last_offs,
4726 blk_per_trk, blksize);
4727 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4728 (PTR_ERR(cqr) != -ENOMEM))
4729 cqr = NULL;
4730 }
4731 if (!cqr)
4732 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
4733 first_rec, last_rec,
4734 first_trk, last_trk,
4735 first_offs, last_offs,
4736 blk_per_trk, blksize);
4737 return cqr;
4738 }
4739
dasd_eckd_build_cp_raw(struct dasd_device * startdev,struct dasd_block * block,struct request * req)4740 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
4741 struct dasd_block *block,
4742 struct request *req)
4743 {
4744 sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
4745 unsigned int seg_len, len_to_track_end;
4746 unsigned int cidaw, cplength, datasize;
4747 sector_t first_trk, last_trk, sectors;
4748 struct dasd_eckd_private *base_priv;
4749 struct dasd_device *basedev;
4750 struct req_iterator iter;
4751 struct dasd_ccw_req *cqr;
4752 unsigned int trkcount;
4753 unsigned long *idaws;
4754 unsigned int size;
4755 unsigned char cmd;
4756 struct bio_vec bv;
4757 struct ccw1 *ccw;
4758 int use_prefix;
4759 void *data;
4760 char *dst;
4761
4762 /*
4763 * raw track access needs to be mutiple of 64k and on 64k boundary
4764 * For read requests we can fix an incorrect alignment by padding
4765 * the request with dummy pages.
4766 */
4767 start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
4768 end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
4769 DASD_RAW_SECTORS_PER_TRACK;
4770 end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
4771 DASD_RAW_SECTORS_PER_TRACK;
4772 basedev = block->base;
4773 if ((start_padding_sectors || end_padding_sectors) &&
4774 (rq_data_dir(req) == WRITE)) {
4775 DBF_DEV_EVENT(DBF_ERR, basedev,
4776 "raw write not track aligned (%llu,%llu) req %p",
4777 start_padding_sectors, end_padding_sectors, req);
4778 return ERR_PTR(-EINVAL);
4779 }
4780
4781 first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
4782 last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
4783 DASD_RAW_SECTORS_PER_TRACK;
4784 trkcount = last_trk - first_trk + 1;
4785
4786 if (rq_data_dir(req) == READ)
4787 cmd = DASD_ECKD_CCW_READ_TRACK;
4788 else if (rq_data_dir(req) == WRITE)
4789 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
4790 else
4791 return ERR_PTR(-EINVAL);
4792
4793 /*
4794 * Raw track based I/O needs IDAWs for each page,
4795 * and not just for 64 bit addresses.
4796 */
4797 cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
4798
4799 /*
4800 * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
4801 * of extended parameter. This is needed for write full track.
4802 */
4803 base_priv = basedev->private;
4804 use_prefix = base_priv->features.feature[8] & 0x01;
4805 if (use_prefix) {
4806 cplength = 1 + trkcount;
4807 size = sizeof(struct PFX_eckd_data) + 2;
4808 } else {
4809 cplength = 2 + trkcount;
4810 size = sizeof(struct DE_eckd_data) +
4811 sizeof(struct LRE_eckd_data) + 2;
4812 }
4813 size = ALIGN(size, 8);
4814
4815 datasize = size + cidaw * sizeof(unsigned long);
4816
4817 /* Allocate the ccw request. */
4818 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
4819 datasize, startdev, blk_mq_rq_to_pdu(req));
4820 if (IS_ERR(cqr))
4821 return cqr;
4822
4823 ccw = cqr->cpaddr;
4824 data = cqr->data;
4825
4826 if (use_prefix) {
4827 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
4828 startdev, 1, 0, trkcount, 0, 0);
4829 } else {
4830 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
4831 ccw[-1].flags |= CCW_FLAG_CC;
4832
4833 data += sizeof(struct DE_eckd_data);
4834 locate_record_ext(ccw++, data, first_trk, 0,
4835 trkcount, cmd, basedev, 0, 0);
4836 }
4837
4838 idaws = (unsigned long *)(cqr->data + size);
4839 len_to_track_end = 0;
4840 if (start_padding_sectors) {
4841 ccw[-1].flags |= CCW_FLAG_CC;
4842 ccw->cmd_code = cmd;
4843 /* maximum 3390 track size */
4844 ccw->count = 57326;
4845 /* 64k map to one track */
4846 len_to_track_end = 65536 - start_padding_sectors * 512;
4847 ccw->cda = (__u32)virt_to_phys(idaws);
4848 ccw->flags |= CCW_FLAG_IDA;
4849 ccw->flags |= CCW_FLAG_SLI;
4850 ccw++;
4851 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
4852 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4853 }
4854 rq_for_each_segment(bv, req, iter) {
4855 dst = bvec_virt(&bv);
4856 seg_len = bv.bv_len;
4857 if (cmd == DASD_ECKD_CCW_READ_TRACK)
4858 memset(dst, 0, seg_len);
4859 if (!len_to_track_end) {
4860 ccw[-1].flags |= CCW_FLAG_CC;
4861 ccw->cmd_code = cmd;
4862 /* maximum 3390 track size */
4863 ccw->count = 57326;
4864 /* 64k map to one track */
4865 len_to_track_end = 65536;
4866 ccw->cda = (__u32)virt_to_phys(idaws);
4867 ccw->flags |= CCW_FLAG_IDA;
4868 ccw->flags |= CCW_FLAG_SLI;
4869 ccw++;
4870 }
4871 len_to_track_end -= seg_len;
4872 idaws = idal_create_words(idaws, dst, seg_len);
4873 }
4874 for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
4875 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4876 if (blk_noretry_request(req) ||
4877 block->base->features & DASD_FEATURE_FAILFAST)
4878 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4879 cqr->startdev = startdev;
4880 cqr->memdev = startdev;
4881 cqr->block = block;
4882 cqr->expires = startdev->default_expires * HZ;
4883 cqr->lpm = dasd_path_get_ppm(startdev);
4884 cqr->retries = startdev->default_retries;
4885 cqr->buildclk = get_tod_clock();
4886 cqr->status = DASD_CQR_FILLED;
4887
4888 return cqr;
4889 }
4890
4891
4892 static int
dasd_eckd_free_cp(struct dasd_ccw_req * cqr,struct request * req)4893 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
4894 {
4895 struct dasd_eckd_private *private;
4896 struct ccw1 *ccw;
4897 struct req_iterator iter;
4898 struct bio_vec bv;
4899 char *dst, *cda;
4900 unsigned int blksize, blk_per_trk, off;
4901 sector_t recid;
4902 int status;
4903
4904 if (!dasd_page_cache)
4905 goto out;
4906 private = cqr->block->base->private;
4907 blksize = cqr->block->bp_block;
4908 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4909 recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
4910 ccw = cqr->cpaddr;
4911 /* Skip over define extent & locate record. */
4912 ccw++;
4913 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
4914 ccw++;
4915 rq_for_each_segment(bv, req, iter) {
4916 dst = bvec_virt(&bv);
4917 for (off = 0; off < bv.bv_len; off += blksize) {
4918 /* Skip locate record. */
4919 if (private->uses_cdl && recid <= 2*blk_per_trk)
4920 ccw++;
4921 if (dst) {
4922 if (ccw->flags & CCW_FLAG_IDA)
4923 cda = *((char **)phys_to_virt(ccw->cda));
4924 else
4925 cda = phys_to_virt(ccw->cda);
4926 if (dst != cda) {
4927 if (rq_data_dir(req) == READ)
4928 memcpy(dst, cda, bv.bv_len);
4929 kmem_cache_free(dasd_page_cache,
4930 (void *)((addr_t)cda & PAGE_MASK));
4931 }
4932 dst = NULL;
4933 }
4934 ccw++;
4935 recid++;
4936 }
4937 }
4938 out:
4939 status = cqr->status == DASD_CQR_DONE;
4940 dasd_sfree_request(cqr, cqr->memdev);
4941 return status;
4942 }
4943
4944 /*
4945 * Modify ccw/tcw in cqr so it can be started on a base device.
4946 *
4947 * Note that this is not enough to restart the cqr!
4948 * Either reset cqr->startdev as well (summary unit check handling)
4949 * or restart via separate cqr (as in ERP handling).
4950 */
dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req * cqr)4951 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4952 {
4953 struct ccw1 *ccw;
4954 struct PFX_eckd_data *pfxdata;
4955 struct tcw *tcw;
4956 struct tccb *tccb;
4957 struct dcw *dcw;
4958
4959 if (cqr->cpmode == 1) {
4960 tcw = cqr->cpaddr;
4961 tccb = tcw_get_tccb(tcw);
4962 dcw = (struct dcw *)&tccb->tca[0];
4963 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4964 pfxdata->validity.verify_base = 0;
4965 pfxdata->validity.hyper_pav = 0;
4966 } else {
4967 ccw = cqr->cpaddr;
4968 pfxdata = cqr->data;
4969 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4970 pfxdata->validity.verify_base = 0;
4971 pfxdata->validity.hyper_pav = 0;
4972 }
4973 }
4974 }
4975
4976 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4977
dasd_eckd_build_alias_cp(struct dasd_device * base,struct dasd_block * block,struct request * req)4978 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4979 struct dasd_block *block,
4980 struct request *req)
4981 {
4982 struct dasd_eckd_private *private;
4983 struct dasd_device *startdev;
4984 unsigned long flags;
4985 struct dasd_ccw_req *cqr;
4986
4987 startdev = dasd_alias_get_start_dev(base);
4988 if (!startdev)
4989 startdev = base;
4990 private = startdev->private;
4991 if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4992 return ERR_PTR(-EBUSY);
4993
4994 spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4995 private->count++;
4996 if ((base->features & DASD_FEATURE_USERAW))
4997 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4998 else
4999 cqr = dasd_eckd_build_cp(startdev, block, req);
5000 if (IS_ERR(cqr))
5001 private->count--;
5002 spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
5003 return cqr;
5004 }
5005
dasd_eckd_free_alias_cp(struct dasd_ccw_req * cqr,struct request * req)5006 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
5007 struct request *req)
5008 {
5009 struct dasd_eckd_private *private;
5010 unsigned long flags;
5011
5012 spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
5013 private = cqr->memdev->private;
5014 private->count--;
5015 spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
5016 return dasd_eckd_free_cp(cqr, req);
5017 }
5018
5019 static int
dasd_eckd_fill_info(struct dasd_device * device,struct dasd_information2_t * info)5020 dasd_eckd_fill_info(struct dasd_device * device,
5021 struct dasd_information2_t * info)
5022 {
5023 struct dasd_eckd_private *private = device->private;
5024
5025 info->label_block = 2;
5026 info->FBA_layout = private->uses_cdl ? 0 : 1;
5027 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
5028 info->characteristics_size = sizeof(private->rdc_data);
5029 memcpy(info->characteristics, &private->rdc_data,
5030 sizeof(private->rdc_data));
5031 info->confdata_size = min_t(unsigned long, private->conf.len,
5032 sizeof(info->configuration_data));
5033 memcpy(info->configuration_data, private->conf.data,
5034 info->confdata_size);
5035 return 0;
5036 }
5037
5038 /*
5039 * SECTION: ioctl functions for eckd devices.
5040 */
5041
5042 /*
5043 * Release device ioctl.
5044 * Buils a channel programm to releases a prior reserved
5045 * (see dasd_eckd_reserve) device.
5046 */
5047 static int
dasd_eckd_release(struct dasd_device * device)5048 dasd_eckd_release(struct dasd_device *device)
5049 {
5050 struct dasd_ccw_req *cqr;
5051 int rc;
5052 struct ccw1 *ccw;
5053 int useglobal;
5054
5055 if (!capable(CAP_SYS_ADMIN))
5056 return -EACCES;
5057
5058 useglobal = 0;
5059 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5060 if (IS_ERR(cqr)) {
5061 mutex_lock(&dasd_reserve_mutex);
5062 useglobal = 1;
5063 cqr = &dasd_reserve_req->cqr;
5064 memset(cqr, 0, sizeof(*cqr));
5065 memset(&dasd_reserve_req->ccw, 0,
5066 sizeof(dasd_reserve_req->ccw));
5067 cqr->cpaddr = &dasd_reserve_req->ccw;
5068 cqr->data = &dasd_reserve_req->data;
5069 cqr->magic = DASD_ECKD_MAGIC;
5070 }
5071 ccw = cqr->cpaddr;
5072 ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
5073 ccw->flags |= CCW_FLAG_SLI;
5074 ccw->count = 32;
5075 ccw->cda = (__u32)virt_to_phys(cqr->data);
5076 cqr->startdev = device;
5077 cqr->memdev = device;
5078 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5079 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5080 cqr->retries = 2; /* set retry counter to enable basic ERP */
5081 cqr->expires = 2 * HZ;
5082 cqr->buildclk = get_tod_clock();
5083 cqr->status = DASD_CQR_FILLED;
5084
5085 rc = dasd_sleep_on_immediatly(cqr);
5086 if (!rc)
5087 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5088
5089 if (useglobal)
5090 mutex_unlock(&dasd_reserve_mutex);
5091 else
5092 dasd_sfree_request(cqr, cqr->memdev);
5093 return rc;
5094 }
5095
5096 /*
5097 * Reserve device ioctl.
5098 * Options are set to 'synchronous wait for interrupt' and
5099 * 'timeout the request'. This leads to a terminate IO if
5100 * the interrupt is outstanding for a certain time.
5101 */
5102 static int
dasd_eckd_reserve(struct dasd_device * device)5103 dasd_eckd_reserve(struct dasd_device *device)
5104 {
5105 struct dasd_ccw_req *cqr;
5106 int rc;
5107 struct ccw1 *ccw;
5108 int useglobal;
5109
5110 if (!capable(CAP_SYS_ADMIN))
5111 return -EACCES;
5112
5113 useglobal = 0;
5114 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5115 if (IS_ERR(cqr)) {
5116 mutex_lock(&dasd_reserve_mutex);
5117 useglobal = 1;
5118 cqr = &dasd_reserve_req->cqr;
5119 memset(cqr, 0, sizeof(*cqr));
5120 memset(&dasd_reserve_req->ccw, 0,
5121 sizeof(dasd_reserve_req->ccw));
5122 cqr->cpaddr = &dasd_reserve_req->ccw;
5123 cqr->data = &dasd_reserve_req->data;
5124 cqr->magic = DASD_ECKD_MAGIC;
5125 }
5126 ccw = cqr->cpaddr;
5127 ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
5128 ccw->flags |= CCW_FLAG_SLI;
5129 ccw->count = 32;
5130 ccw->cda = (__u32)virt_to_phys(cqr->data);
5131 cqr->startdev = device;
5132 cqr->memdev = device;
5133 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5134 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5135 cqr->retries = 2; /* set retry counter to enable basic ERP */
5136 cqr->expires = 2 * HZ;
5137 cqr->buildclk = get_tod_clock();
5138 cqr->status = DASD_CQR_FILLED;
5139
5140 rc = dasd_sleep_on_immediatly(cqr);
5141 if (!rc)
5142 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5143
5144 if (useglobal)
5145 mutex_unlock(&dasd_reserve_mutex);
5146 else
5147 dasd_sfree_request(cqr, cqr->memdev);
5148 return rc;
5149 }
5150
5151 /*
5152 * Steal lock ioctl - unconditional reserve device.
5153 * Buils a channel programm to break a device's reservation.
5154 * (unconditional reserve)
5155 */
5156 static int
dasd_eckd_steal_lock(struct dasd_device * device)5157 dasd_eckd_steal_lock(struct dasd_device *device)
5158 {
5159 struct dasd_ccw_req *cqr;
5160 int rc;
5161 struct ccw1 *ccw;
5162 int useglobal;
5163
5164 if (!capable(CAP_SYS_ADMIN))
5165 return -EACCES;
5166
5167 useglobal = 0;
5168 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5169 if (IS_ERR(cqr)) {
5170 mutex_lock(&dasd_reserve_mutex);
5171 useglobal = 1;
5172 cqr = &dasd_reserve_req->cqr;
5173 memset(cqr, 0, sizeof(*cqr));
5174 memset(&dasd_reserve_req->ccw, 0,
5175 sizeof(dasd_reserve_req->ccw));
5176 cqr->cpaddr = &dasd_reserve_req->ccw;
5177 cqr->data = &dasd_reserve_req->data;
5178 cqr->magic = DASD_ECKD_MAGIC;
5179 }
5180 ccw = cqr->cpaddr;
5181 ccw->cmd_code = DASD_ECKD_CCW_SLCK;
5182 ccw->flags |= CCW_FLAG_SLI;
5183 ccw->count = 32;
5184 ccw->cda = (__u32)virt_to_phys(cqr->data);
5185 cqr->startdev = device;
5186 cqr->memdev = device;
5187 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5188 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5189 cqr->retries = 2; /* set retry counter to enable basic ERP */
5190 cqr->expires = 2 * HZ;
5191 cqr->buildclk = get_tod_clock();
5192 cqr->status = DASD_CQR_FILLED;
5193
5194 rc = dasd_sleep_on_immediatly(cqr);
5195 if (!rc)
5196 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5197
5198 if (useglobal)
5199 mutex_unlock(&dasd_reserve_mutex);
5200 else
5201 dasd_sfree_request(cqr, cqr->memdev);
5202 return rc;
5203 }
5204
5205 /*
5206 * SNID - Sense Path Group ID
5207 * This ioctl may be used in situations where I/O is stalled due to
5208 * a reserve, so if the normal dasd_smalloc_request fails, we use the
5209 * preallocated dasd_reserve_req.
5210 */
dasd_eckd_snid(struct dasd_device * device,void __user * argp)5211 static int dasd_eckd_snid(struct dasd_device *device,
5212 void __user *argp)
5213 {
5214 struct dasd_ccw_req *cqr;
5215 int rc;
5216 struct ccw1 *ccw;
5217 int useglobal;
5218 struct dasd_snid_ioctl_data usrparm;
5219
5220 if (!capable(CAP_SYS_ADMIN))
5221 return -EACCES;
5222
5223 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5224 return -EFAULT;
5225
5226 useglobal = 0;
5227 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
5228 sizeof(struct dasd_snid_data), device,
5229 NULL);
5230 if (IS_ERR(cqr)) {
5231 mutex_lock(&dasd_reserve_mutex);
5232 useglobal = 1;
5233 cqr = &dasd_reserve_req->cqr;
5234 memset(cqr, 0, sizeof(*cqr));
5235 memset(&dasd_reserve_req->ccw, 0,
5236 sizeof(dasd_reserve_req->ccw));
5237 cqr->cpaddr = &dasd_reserve_req->ccw;
5238 cqr->data = &dasd_reserve_req->data;
5239 cqr->magic = DASD_ECKD_MAGIC;
5240 }
5241 ccw = cqr->cpaddr;
5242 ccw->cmd_code = DASD_ECKD_CCW_SNID;
5243 ccw->flags |= CCW_FLAG_SLI;
5244 ccw->count = 12;
5245 ccw->cda = (__u32)virt_to_phys(cqr->data);
5246 cqr->startdev = device;
5247 cqr->memdev = device;
5248 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5249 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5250 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
5251 cqr->retries = 5;
5252 cqr->expires = 10 * HZ;
5253 cqr->buildclk = get_tod_clock();
5254 cqr->status = DASD_CQR_FILLED;
5255 cqr->lpm = usrparm.path_mask;
5256
5257 rc = dasd_sleep_on_immediatly(cqr);
5258 /* verify that I/O processing didn't modify the path mask */
5259 if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
5260 rc = -EIO;
5261 if (!rc) {
5262 usrparm.data = *((struct dasd_snid_data *)cqr->data);
5263 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
5264 rc = -EFAULT;
5265 }
5266
5267 if (useglobal)
5268 mutex_unlock(&dasd_reserve_mutex);
5269 else
5270 dasd_sfree_request(cqr, cqr->memdev);
5271 return rc;
5272 }
5273
5274 /*
5275 * Read performance statistics
5276 */
5277 static int
dasd_eckd_performance(struct dasd_device * device,void __user * argp)5278 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
5279 {
5280 struct dasd_psf_prssd_data *prssdp;
5281 struct dasd_rssd_perf_stats_t *stats;
5282 struct dasd_ccw_req *cqr;
5283 struct ccw1 *ccw;
5284 int rc;
5285
5286 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5287 (sizeof(struct dasd_psf_prssd_data) +
5288 sizeof(struct dasd_rssd_perf_stats_t)),
5289 device, NULL);
5290 if (IS_ERR(cqr)) {
5291 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5292 "Could not allocate initialization request");
5293 return PTR_ERR(cqr);
5294 }
5295 cqr->startdev = device;
5296 cqr->memdev = device;
5297 cqr->retries = 0;
5298 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5299 cqr->expires = 10 * HZ;
5300
5301 /* Prepare for Read Subsystem Data */
5302 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5303 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5304 prssdp->order = PSF_ORDER_PRSSD;
5305 prssdp->suborder = 0x01; /* Performance Statistics */
5306 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
5307
5308 ccw = cqr->cpaddr;
5309 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5310 ccw->count = sizeof(struct dasd_psf_prssd_data);
5311 ccw->flags |= CCW_FLAG_CC;
5312 ccw->cda = (__u32)virt_to_phys(prssdp);
5313
5314 /* Read Subsystem Data - Performance Statistics */
5315 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5316 memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
5317
5318 ccw++;
5319 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5320 ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
5321 ccw->cda = (__u32)virt_to_phys(stats);
5322
5323 cqr->buildclk = get_tod_clock();
5324 cqr->status = DASD_CQR_FILLED;
5325 rc = dasd_sleep_on(cqr);
5326 if (rc == 0) {
5327 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5328 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5329 if (copy_to_user(argp, stats,
5330 sizeof(struct dasd_rssd_perf_stats_t)))
5331 rc = -EFAULT;
5332 }
5333 dasd_sfree_request(cqr, cqr->memdev);
5334 return rc;
5335 }
5336
5337 /*
5338 * Get attributes (cache operations)
5339 * Returnes the cache attributes used in Define Extend (DE).
5340 */
5341 static int
dasd_eckd_get_attrib(struct dasd_device * device,void __user * argp)5342 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
5343 {
5344 struct dasd_eckd_private *private = device->private;
5345 struct attrib_data_t attrib = private->attrib;
5346 int rc;
5347
5348 if (!capable(CAP_SYS_ADMIN))
5349 return -EACCES;
5350 if (!argp)
5351 return -EINVAL;
5352
5353 rc = 0;
5354 if (copy_to_user(argp, (long *) &attrib,
5355 sizeof(struct attrib_data_t)))
5356 rc = -EFAULT;
5357
5358 return rc;
5359 }
5360
5361 /*
5362 * Set attributes (cache operations)
5363 * Stores the attributes for cache operation to be used in Define Extend (DE).
5364 */
5365 static int
dasd_eckd_set_attrib(struct dasd_device * device,void __user * argp)5366 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
5367 {
5368 struct dasd_eckd_private *private = device->private;
5369 struct attrib_data_t attrib;
5370
5371 if (!capable(CAP_SYS_ADMIN))
5372 return -EACCES;
5373 if (!argp)
5374 return -EINVAL;
5375
5376 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
5377 return -EFAULT;
5378 private->attrib = attrib;
5379
5380 dev_info(&device->cdev->dev,
5381 "The DASD cache mode was set to %x (%i cylinder prestage)\n",
5382 private->attrib.operation, private->attrib.nr_cyl);
5383 return 0;
5384 }
5385
5386 /*
5387 * Issue syscall I/O to EMC Symmetrix array.
5388 * CCWs are PSF and RSSD
5389 */
dasd_symm_io(struct dasd_device * device,void __user * argp)5390 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
5391 {
5392 struct dasd_symmio_parms usrparm;
5393 char *psf_data, *rssd_result;
5394 struct dasd_ccw_req *cqr;
5395 struct ccw1 *ccw;
5396 char psf0, psf1;
5397 int rc;
5398
5399 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
5400 return -EACCES;
5401 psf0 = psf1 = 0;
5402
5403 /* Copy parms from caller */
5404 rc = -EFAULT;
5405 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5406 goto out;
5407 if (is_compat_task()) {
5408 /* Make sure pointers are sane even on 31 bit. */
5409 rc = -EINVAL;
5410 if ((usrparm.psf_data >> 32) != 0)
5411 goto out;
5412 if ((usrparm.rssd_result >> 32) != 0)
5413 goto out;
5414 usrparm.psf_data &= 0x7fffffffULL;
5415 usrparm.rssd_result &= 0x7fffffffULL;
5416 }
5417 /* at least 2 bytes are accessed and should be allocated */
5418 if (usrparm.psf_data_len < 2) {
5419 DBF_DEV_EVENT(DBF_WARNING, device,
5420 "Symmetrix ioctl invalid data length %d",
5421 usrparm.psf_data_len);
5422 rc = -EINVAL;
5423 goto out;
5424 }
5425 /* alloc I/O data area */
5426 psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
5427 rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
5428 if (!psf_data || !rssd_result) {
5429 rc = -ENOMEM;
5430 goto out_free;
5431 }
5432
5433 /* get syscall header from user space */
5434 rc = -EFAULT;
5435 if (copy_from_user(psf_data,
5436 (void __user *)(unsigned long) usrparm.psf_data,
5437 usrparm.psf_data_len))
5438 goto out_free;
5439 psf0 = psf_data[0];
5440 psf1 = psf_data[1];
5441
5442 /* setup CCWs for PSF + RSSD */
5443 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
5444 if (IS_ERR(cqr)) {
5445 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5446 "Could not allocate initialization request");
5447 rc = PTR_ERR(cqr);
5448 goto out_free;
5449 }
5450
5451 cqr->startdev = device;
5452 cqr->memdev = device;
5453 cqr->retries = 3;
5454 cqr->expires = 10 * HZ;
5455 cqr->buildclk = get_tod_clock();
5456 cqr->status = DASD_CQR_FILLED;
5457
5458 /* Build the ccws */
5459 ccw = cqr->cpaddr;
5460
5461 /* PSF ccw */
5462 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5463 ccw->count = usrparm.psf_data_len;
5464 ccw->flags |= CCW_FLAG_CC;
5465 ccw->cda = (__u32)virt_to_phys(psf_data);
5466
5467 ccw++;
5468
5469 /* RSSD ccw */
5470 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5471 ccw->count = usrparm.rssd_result_len;
5472 ccw->flags = CCW_FLAG_SLI ;
5473 ccw->cda = (__u32)virt_to_phys(rssd_result);
5474
5475 rc = dasd_sleep_on(cqr);
5476 if (rc)
5477 goto out_sfree;
5478
5479 rc = -EFAULT;
5480 if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
5481 rssd_result, usrparm.rssd_result_len))
5482 goto out_sfree;
5483 rc = 0;
5484
5485 out_sfree:
5486 dasd_sfree_request(cqr, cqr->memdev);
5487 out_free:
5488 kfree(rssd_result);
5489 kfree(psf_data);
5490 out:
5491 DBF_DEV_EVENT(DBF_WARNING, device,
5492 "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
5493 (int) psf0, (int) psf1, rc);
5494 return rc;
5495 }
5496
5497 static int
dasd_eckd_ioctl(struct dasd_block * block,unsigned int cmd,void __user * argp)5498 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
5499 {
5500 struct dasd_device *device = block->base;
5501
5502 switch (cmd) {
5503 case BIODASDGATTR:
5504 return dasd_eckd_get_attrib(device, argp);
5505 case BIODASDSATTR:
5506 return dasd_eckd_set_attrib(device, argp);
5507 case BIODASDPSRD:
5508 return dasd_eckd_performance(device, argp);
5509 case BIODASDRLSE:
5510 return dasd_eckd_release(device);
5511 case BIODASDRSRV:
5512 return dasd_eckd_reserve(device);
5513 case BIODASDSLCK:
5514 return dasd_eckd_steal_lock(device);
5515 case BIODASDSNID:
5516 return dasd_eckd_snid(device, argp);
5517 case BIODASDSYMMIO:
5518 return dasd_symm_io(device, argp);
5519 default:
5520 return -ENOTTY;
5521 }
5522 }
5523
5524 /*
5525 * Dump the range of CCWs into 'page' buffer
5526 * and return number of printed chars.
5527 */
5528 static void
dasd_eckd_dump_ccw_range(struct ccw1 * from,struct ccw1 * to,char * page)5529 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
5530 {
5531 int len, count;
5532 char *datap;
5533
5534 len = 0;
5535 while (from <= to) {
5536 len += sprintf(page + len, PRINTK_HEADER
5537 " CCW %p: %08X %08X DAT:",
5538 from, ((int *) from)[0], ((int *) from)[1]);
5539
5540 /* get pointer to data (consider IDALs) */
5541 if (from->flags & CCW_FLAG_IDA)
5542 datap = (char *)*((addr_t *)phys_to_virt(from->cda));
5543 else
5544 datap = phys_to_virt(from->cda);
5545
5546 /* dump data (max 128 bytes) */
5547 for (count = 0; count < from->count && count < 128; count++) {
5548 if (count % 32 == 0)
5549 len += sprintf(page + len, "\n");
5550 if (count % 8 == 0)
5551 len += sprintf(page + len, " ");
5552 if (count % 4 == 0)
5553 len += sprintf(page + len, " ");
5554 len += sprintf(page + len, "%02x", datap[count]);
5555 }
5556 len += sprintf(page + len, "\n");
5557 from++;
5558 }
5559 if (len > 0)
5560 printk(KERN_ERR "%s", page);
5561 }
5562
5563 static void
dasd_eckd_dump_sense_dbf(struct dasd_device * device,struct irb * irb,char * reason)5564 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
5565 char *reason)
5566 {
5567 u64 *sense;
5568 u64 *stat;
5569
5570 sense = (u64 *) dasd_get_sense(irb);
5571 stat = (u64 *) &irb->scsw;
5572 if (sense) {
5573 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
5574 "%016llx %016llx %016llx %016llx",
5575 reason, *stat, *((u32 *) (stat + 1)),
5576 sense[0], sense[1], sense[2], sense[3]);
5577 } else {
5578 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
5579 reason, *stat, *((u32 *) (stat + 1)),
5580 "NO VALID SENSE");
5581 }
5582 }
5583
5584 /*
5585 * Print sense data and related channel program.
5586 * Parts are printed because printk buffer is only 1024 bytes.
5587 */
dasd_eckd_dump_sense_ccw(struct dasd_device * device,struct dasd_ccw_req * req,struct irb * irb)5588 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
5589 struct dasd_ccw_req *req, struct irb *irb)
5590 {
5591 char *page;
5592 struct ccw1 *first, *last, *fail, *from, *to;
5593 int len, sl, sct;
5594
5595 page = (char *) get_zeroed_page(GFP_ATOMIC);
5596 if (page == NULL) {
5597 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5598 "No memory to dump sense data\n");
5599 return;
5600 }
5601 /* dump the sense data */
5602 len = sprintf(page, PRINTK_HEADER
5603 " I/O status report for device %s:\n",
5604 dev_name(&device->cdev->dev));
5605 len += sprintf(page + len, PRINTK_HEADER
5606 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5607 "CS:%02X RC:%d\n",
5608 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5609 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5610 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5611 req ? req->intrc : 0);
5612 len += sprintf(page + len, PRINTK_HEADER
5613 " device %s: Failing CCW: %p\n",
5614 dev_name(&device->cdev->dev),
5615 phys_to_virt(irb->scsw.cmd.cpa));
5616 if (irb->esw.esw0.erw.cons) {
5617 for (sl = 0; sl < 4; sl++) {
5618 len += sprintf(page + len, PRINTK_HEADER
5619 " Sense(hex) %2d-%2d:",
5620 (8 * sl), ((8 * sl) + 7));
5621
5622 for (sct = 0; sct < 8; sct++) {
5623 len += sprintf(page + len, " %02x",
5624 irb->ecw[8 * sl + sct]);
5625 }
5626 len += sprintf(page + len, "\n");
5627 }
5628
5629 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
5630 /* 24 Byte Sense Data */
5631 sprintf(page + len, PRINTK_HEADER
5632 " 24 Byte: %x MSG %x, "
5633 "%s MSGb to SYSOP\n",
5634 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
5635 irb->ecw[1] & 0x10 ? "" : "no");
5636 } else {
5637 /* 32 Byte Sense Data */
5638 sprintf(page + len, PRINTK_HEADER
5639 " 32 Byte: Format: %x "
5640 "Exception class %x\n",
5641 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
5642 }
5643 } else {
5644 sprintf(page + len, PRINTK_HEADER
5645 " SORRY - NO VALID SENSE AVAILABLE\n");
5646 }
5647 printk(KERN_ERR "%s", page);
5648
5649 if (req) {
5650 /* req == NULL for unsolicited interrupts */
5651 /* dump the Channel Program (max 140 Bytes per line) */
5652 /* Count CCW and print first CCWs (maximum 7) */
5653 first = req->cpaddr;
5654 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
5655 to = min(first + 6, last);
5656 printk(KERN_ERR PRINTK_HEADER " Related CP in req: %p\n", req);
5657 dasd_eckd_dump_ccw_range(first, to, page);
5658
5659 /* print failing CCW area (maximum 4) */
5660 /* scsw->cda is either valid or zero */
5661 from = ++to;
5662 fail = phys_to_virt(irb->scsw.cmd.cpa); /* failing CCW */
5663 if (from < fail - 2) {
5664 from = fail - 2; /* there is a gap - print header */
5665 printk(KERN_ERR PRINTK_HEADER "......\n");
5666 }
5667 to = min(fail + 1, last);
5668 dasd_eckd_dump_ccw_range(from, to, page + len);
5669
5670 /* print last CCWs (maximum 2) */
5671 len = 0;
5672 from = max(from, ++to);
5673 if (from < last - 1) {
5674 from = last - 1; /* there is a gap - print header */
5675 printk(KERN_ERR PRINTK_HEADER "......\n");
5676 }
5677 dasd_eckd_dump_ccw_range(from, last, page + len);
5678 }
5679 free_page((unsigned long) page);
5680 }
5681
5682
5683 /*
5684 * Print sense data from a tcw.
5685 */
dasd_eckd_dump_sense_tcw(struct dasd_device * device,struct dasd_ccw_req * req,struct irb * irb)5686 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
5687 struct dasd_ccw_req *req, struct irb *irb)
5688 {
5689 char *page;
5690 int len, sl, sct, residual;
5691 struct tsb *tsb;
5692 u8 *sense, *rcq;
5693
5694 page = (char *) get_zeroed_page(GFP_ATOMIC);
5695 if (page == NULL) {
5696 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
5697 "No memory to dump sense data");
5698 return;
5699 }
5700 /* dump the sense data */
5701 len = sprintf(page, PRINTK_HEADER
5702 " I/O status report for device %s:\n",
5703 dev_name(&device->cdev->dev));
5704 len += sprintf(page + len, PRINTK_HEADER
5705 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5706 "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
5707 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5708 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5709 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5710 irb->scsw.tm.fcxs,
5711 (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
5712 req ? req->intrc : 0);
5713 len += sprintf(page + len, PRINTK_HEADER
5714 " device %s: Failing TCW: %p\n",
5715 dev_name(&device->cdev->dev),
5716 phys_to_virt(irb->scsw.tm.tcw));
5717
5718 tsb = NULL;
5719 sense = NULL;
5720 if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
5721 tsb = tcw_get_tsb(phys_to_virt(irb->scsw.tm.tcw));
5722
5723 if (tsb) {
5724 len += sprintf(page + len, PRINTK_HEADER
5725 " tsb->length %d\n", tsb->length);
5726 len += sprintf(page + len, PRINTK_HEADER
5727 " tsb->flags %x\n", tsb->flags);
5728 len += sprintf(page + len, PRINTK_HEADER
5729 " tsb->dcw_offset %d\n", tsb->dcw_offset);
5730 len += sprintf(page + len, PRINTK_HEADER
5731 " tsb->count %d\n", tsb->count);
5732 residual = tsb->count - 28;
5733 len += sprintf(page + len, PRINTK_HEADER
5734 " residual %d\n", residual);
5735
5736 switch (tsb->flags & 0x07) {
5737 case 1: /* tsa_iostat */
5738 len += sprintf(page + len, PRINTK_HEADER
5739 " tsb->tsa.iostat.dev_time %d\n",
5740 tsb->tsa.iostat.dev_time);
5741 len += sprintf(page + len, PRINTK_HEADER
5742 " tsb->tsa.iostat.def_time %d\n",
5743 tsb->tsa.iostat.def_time);
5744 len += sprintf(page + len, PRINTK_HEADER
5745 " tsb->tsa.iostat.queue_time %d\n",
5746 tsb->tsa.iostat.queue_time);
5747 len += sprintf(page + len, PRINTK_HEADER
5748 " tsb->tsa.iostat.dev_busy_time %d\n",
5749 tsb->tsa.iostat.dev_busy_time);
5750 len += sprintf(page + len, PRINTK_HEADER
5751 " tsb->tsa.iostat.dev_act_time %d\n",
5752 tsb->tsa.iostat.dev_act_time);
5753 sense = tsb->tsa.iostat.sense;
5754 break;
5755 case 2: /* ts_ddpc */
5756 len += sprintf(page + len, PRINTK_HEADER
5757 " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
5758 for (sl = 0; sl < 2; sl++) {
5759 len += sprintf(page + len, PRINTK_HEADER
5760 " tsb->tsa.ddpc.rcq %2d-%2d: ",
5761 (8 * sl), ((8 * sl) + 7));
5762 rcq = tsb->tsa.ddpc.rcq;
5763 for (sct = 0; sct < 8; sct++) {
5764 len += sprintf(page + len, " %02x",
5765 rcq[8 * sl + sct]);
5766 }
5767 len += sprintf(page + len, "\n");
5768 }
5769 sense = tsb->tsa.ddpc.sense;
5770 break;
5771 case 3: /* tsa_intrg */
5772 len += sprintf(page + len, PRINTK_HEADER
5773 " tsb->tsa.intrg.: not supported yet\n");
5774 break;
5775 }
5776
5777 if (sense) {
5778 for (sl = 0; sl < 4; sl++) {
5779 len += sprintf(page + len, PRINTK_HEADER
5780 " Sense(hex) %2d-%2d:",
5781 (8 * sl), ((8 * sl) + 7));
5782 for (sct = 0; sct < 8; sct++) {
5783 len += sprintf(page + len, " %02x",
5784 sense[8 * sl + sct]);
5785 }
5786 len += sprintf(page + len, "\n");
5787 }
5788
5789 if (sense[27] & DASD_SENSE_BIT_0) {
5790 /* 24 Byte Sense Data */
5791 sprintf(page + len, PRINTK_HEADER
5792 " 24 Byte: %x MSG %x, "
5793 "%s MSGb to SYSOP\n",
5794 sense[7] >> 4, sense[7] & 0x0f,
5795 sense[1] & 0x10 ? "" : "no");
5796 } else {
5797 /* 32 Byte Sense Data */
5798 sprintf(page + len, PRINTK_HEADER
5799 " 32 Byte: Format: %x "
5800 "Exception class %x\n",
5801 sense[6] & 0x0f, sense[22] >> 4);
5802 }
5803 } else {
5804 sprintf(page + len, PRINTK_HEADER
5805 " SORRY - NO VALID SENSE AVAILABLE\n");
5806 }
5807 } else {
5808 sprintf(page + len, PRINTK_HEADER
5809 " SORRY - NO TSB DATA AVAILABLE\n");
5810 }
5811 printk(KERN_ERR "%s", page);
5812 free_page((unsigned long) page);
5813 }
5814
dasd_eckd_dump_sense(struct dasd_device * device,struct dasd_ccw_req * req,struct irb * irb)5815 static void dasd_eckd_dump_sense(struct dasd_device *device,
5816 struct dasd_ccw_req *req, struct irb *irb)
5817 {
5818 u8 *sense = dasd_get_sense(irb);
5819
5820 /*
5821 * In some cases certain errors might be expected and
5822 * log messages shouldn't be written then.
5823 * Check if the according suppress bit is set.
5824 */
5825 if (sense && (sense[1] & SNS1_INV_TRACK_FORMAT) &&
5826 !(sense[2] & SNS2_ENV_DATA_PRESENT) &&
5827 test_bit(DASD_CQR_SUPPRESS_IT, &req->flags))
5828 return;
5829
5830 if (sense && sense[0] & SNS0_CMD_REJECT &&
5831 test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
5832 return;
5833
5834 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
5835 test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
5836 return;
5837
5838 if (scsw_cstat(&irb->scsw) == 0x40 &&
5839 test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
5840 return;
5841
5842 if (scsw_is_tm(&irb->scsw))
5843 dasd_eckd_dump_sense_tcw(device, req, irb);
5844 else
5845 dasd_eckd_dump_sense_ccw(device, req, irb);
5846 }
5847
dasd_eckd_reload_device(struct dasd_device * device)5848 static int dasd_eckd_reload_device(struct dasd_device *device)
5849 {
5850 struct dasd_eckd_private *private = device->private;
5851 char print_uid[DASD_UID_STRLEN];
5852 int rc, old_base;
5853 struct dasd_uid uid;
5854 unsigned long flags;
5855
5856 /*
5857 * remove device from alias handling to prevent new requests
5858 * from being scheduled on the wrong alias device
5859 */
5860 dasd_alias_remove_device(device);
5861
5862 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5863 old_base = private->uid.base_unit_addr;
5864 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5865
5866 /* Read Configuration Data */
5867 rc = dasd_eckd_read_conf(device);
5868 if (rc)
5869 goto out_err;
5870
5871 dasd_eckd_read_fc_security(device);
5872
5873 rc = dasd_eckd_generate_uid(device);
5874 if (rc)
5875 goto out_err;
5876 /*
5877 * update unit address configuration and
5878 * add device to alias management
5879 */
5880 dasd_alias_update_add_device(device);
5881
5882 dasd_eckd_get_uid(device, &uid);
5883
5884 if (old_base != uid.base_unit_addr) {
5885 dasd_eckd_get_uid_string(&private->conf, print_uid);
5886 dev_info(&device->cdev->dev,
5887 "An Alias device was reassigned to a new base device "
5888 "with UID: %s\n", print_uid);
5889 }
5890 return 0;
5891
5892 out_err:
5893 return -1;
5894 }
5895
dasd_eckd_read_message_buffer(struct dasd_device * device,struct dasd_rssd_messages * messages,__u8 lpum)5896 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5897 struct dasd_rssd_messages *messages,
5898 __u8 lpum)
5899 {
5900 struct dasd_rssd_messages *message_buf;
5901 struct dasd_psf_prssd_data *prssdp;
5902 struct dasd_ccw_req *cqr;
5903 struct ccw1 *ccw;
5904 int rc;
5905
5906 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5907 (sizeof(struct dasd_psf_prssd_data) +
5908 sizeof(struct dasd_rssd_messages)),
5909 device, NULL);
5910 if (IS_ERR(cqr)) {
5911 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5912 "Could not allocate read message buffer request");
5913 return PTR_ERR(cqr);
5914 }
5915
5916 cqr->lpm = lpum;
5917 retry:
5918 cqr->startdev = device;
5919 cqr->memdev = device;
5920 cqr->block = NULL;
5921 cqr->expires = 10 * HZ;
5922 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5923 /* dasd_sleep_on_immediatly does not do complex error
5924 * recovery so clear erp flag and set retry counter to
5925 * do basic erp */
5926 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5927 cqr->retries = 256;
5928
5929 /* Prepare for Read Subsystem Data */
5930 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5931 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5932 prssdp->order = PSF_ORDER_PRSSD;
5933 prssdp->suborder = 0x03; /* Message Buffer */
5934 /* all other bytes of prssdp must be zero */
5935
5936 ccw = cqr->cpaddr;
5937 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5938 ccw->count = sizeof(struct dasd_psf_prssd_data);
5939 ccw->flags |= CCW_FLAG_CC;
5940 ccw->flags |= CCW_FLAG_SLI;
5941 ccw->cda = (__u32)virt_to_phys(prssdp);
5942
5943 /* Read Subsystem Data - message buffer */
5944 message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5945 memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5946
5947 ccw++;
5948 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5949 ccw->count = sizeof(struct dasd_rssd_messages);
5950 ccw->flags |= CCW_FLAG_SLI;
5951 ccw->cda = (__u32)virt_to_phys(message_buf);
5952
5953 cqr->buildclk = get_tod_clock();
5954 cqr->status = DASD_CQR_FILLED;
5955 rc = dasd_sleep_on_immediatly(cqr);
5956 if (rc == 0) {
5957 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5958 message_buf = (struct dasd_rssd_messages *)
5959 (prssdp + 1);
5960 memcpy(messages, message_buf,
5961 sizeof(struct dasd_rssd_messages));
5962 } else if (cqr->lpm) {
5963 /*
5964 * on z/VM we might not be able to do I/O on the requested path
5965 * but instead we get the required information on any path
5966 * so retry with open path mask
5967 */
5968 cqr->lpm = 0;
5969 goto retry;
5970 } else
5971 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5972 "Reading messages failed with rc=%d\n"
5973 , rc);
5974 dasd_sfree_request(cqr, cqr->memdev);
5975 return rc;
5976 }
5977
dasd_eckd_query_host_access(struct dasd_device * device,struct dasd_psf_query_host_access * data)5978 static int dasd_eckd_query_host_access(struct dasd_device *device,
5979 struct dasd_psf_query_host_access *data)
5980 {
5981 struct dasd_eckd_private *private = device->private;
5982 struct dasd_psf_query_host_access *host_access;
5983 struct dasd_psf_prssd_data *prssdp;
5984 struct dasd_ccw_req *cqr;
5985 struct ccw1 *ccw;
5986 int rc;
5987
5988 /* not available for HYPER PAV alias devices */
5989 if (!device->block && private->lcu->pav == HYPER_PAV)
5990 return -EOPNOTSUPP;
5991
5992 /* may not be supported by the storage server */
5993 if (!(private->features.feature[14] & 0x80))
5994 return -EOPNOTSUPP;
5995
5996 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5997 sizeof(struct dasd_psf_prssd_data) + 1,
5998 device, NULL);
5999 if (IS_ERR(cqr)) {
6000 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6001 "Could not allocate read message buffer request");
6002 return PTR_ERR(cqr);
6003 }
6004 host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
6005 if (!host_access) {
6006 dasd_sfree_request(cqr, device);
6007 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6008 "Could not allocate host_access buffer");
6009 return -ENOMEM;
6010 }
6011 cqr->startdev = device;
6012 cqr->memdev = device;
6013 cqr->block = NULL;
6014 cqr->retries = 256;
6015 cqr->expires = 10 * HZ;
6016
6017 /* Prepare for Read Subsystem Data */
6018 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
6019 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
6020 prssdp->order = PSF_ORDER_PRSSD;
6021 prssdp->suborder = PSF_SUBORDER_QHA; /* query host access */
6022 /* LSS and Volume that will be queried */
6023 prssdp->lss = private->conf.ned->ID;
6024 prssdp->volume = private->conf.ned->unit_addr;
6025 /* all other bytes of prssdp must be zero */
6026
6027 ccw = cqr->cpaddr;
6028 ccw->cmd_code = DASD_ECKD_CCW_PSF;
6029 ccw->count = sizeof(struct dasd_psf_prssd_data);
6030 ccw->flags |= CCW_FLAG_CC;
6031 ccw->flags |= CCW_FLAG_SLI;
6032 ccw->cda = (__u32)virt_to_phys(prssdp);
6033
6034 /* Read Subsystem Data - query host access */
6035 ccw++;
6036 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
6037 ccw->count = sizeof(struct dasd_psf_query_host_access);
6038 ccw->flags |= CCW_FLAG_SLI;
6039 ccw->cda = (__u32)virt_to_phys(host_access);
6040
6041 cqr->buildclk = get_tod_clock();
6042 cqr->status = DASD_CQR_FILLED;
6043 /* the command might not be supported, suppress error message */
6044 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
6045 rc = dasd_sleep_on_interruptible(cqr);
6046 if (rc == 0) {
6047 *data = *host_access;
6048 } else {
6049 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
6050 "Reading host access data failed with rc=%d\n",
6051 rc);
6052 rc = -EOPNOTSUPP;
6053 }
6054
6055 dasd_sfree_request(cqr, cqr->memdev);
6056 kfree(host_access);
6057 return rc;
6058 }
6059 /*
6060 * return number of grouped devices
6061 */
dasd_eckd_host_access_count(struct dasd_device * device)6062 static int dasd_eckd_host_access_count(struct dasd_device *device)
6063 {
6064 struct dasd_psf_query_host_access *access;
6065 struct dasd_ckd_path_group_entry *entry;
6066 struct dasd_ckd_host_information *info;
6067 int count = 0;
6068 int rc, i;
6069
6070 access = kzalloc(sizeof(*access), GFP_NOIO);
6071 if (!access) {
6072 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6073 "Could not allocate access buffer");
6074 return -ENOMEM;
6075 }
6076 rc = dasd_eckd_query_host_access(device, access);
6077 if (rc) {
6078 kfree(access);
6079 return rc;
6080 }
6081
6082 info = (struct dasd_ckd_host_information *)
6083 access->host_access_information;
6084 for (i = 0; i < info->entry_count; i++) {
6085 entry = (struct dasd_ckd_path_group_entry *)
6086 (info->entry + i * info->entry_size);
6087 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
6088 count++;
6089 }
6090
6091 kfree(access);
6092 return count;
6093 }
6094
6095 /*
6096 * write host access information to a sequential file
6097 */
dasd_hosts_print(struct dasd_device * device,struct seq_file * m)6098 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
6099 {
6100 struct dasd_psf_query_host_access *access;
6101 struct dasd_ckd_path_group_entry *entry;
6102 struct dasd_ckd_host_information *info;
6103 char sysplex[9] = "";
6104 int rc, i;
6105
6106 access = kzalloc(sizeof(*access), GFP_NOIO);
6107 if (!access) {
6108 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6109 "Could not allocate access buffer");
6110 return -ENOMEM;
6111 }
6112 rc = dasd_eckd_query_host_access(device, access);
6113 if (rc) {
6114 kfree(access);
6115 return rc;
6116 }
6117
6118 info = (struct dasd_ckd_host_information *)
6119 access->host_access_information;
6120 for (i = 0; i < info->entry_count; i++) {
6121 entry = (struct dasd_ckd_path_group_entry *)
6122 (info->entry + i * info->entry_size);
6123 /* PGID */
6124 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
6125 /* FLAGS */
6126 seq_printf(m, "status_flags %02x\n", entry->status_flags);
6127 /* SYSPLEX NAME */
6128 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
6129 EBCASC(sysplex, sizeof(sysplex));
6130 seq_printf(m, "sysplex_name %8s\n", sysplex);
6131 /* SUPPORTED CYLINDER */
6132 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
6133 /* TIMESTAMP */
6134 seq_printf(m, "timestamp %lu\n", (unsigned long)
6135 entry->timestamp);
6136 }
6137 kfree(access);
6138
6139 return 0;
6140 }
6141
6142 static struct dasd_device
copy_relation_find_device(struct dasd_copy_relation * copy,char * busid)6143 *copy_relation_find_device(struct dasd_copy_relation *copy,
6144 char *busid)
6145 {
6146 int i;
6147
6148 for (i = 0; i < DASD_CP_ENTRIES; i++) {
6149 if (copy->entry[i].configured &&
6150 strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0)
6151 return copy->entry[i].device;
6152 }
6153 return NULL;
6154 }
6155
6156 /*
6157 * set the new active/primary device
6158 */
copy_pair_set_active(struct dasd_copy_relation * copy,char * new_busid,char * old_busid)6159 static void copy_pair_set_active(struct dasd_copy_relation *copy, char *new_busid,
6160 char *old_busid)
6161 {
6162 int i;
6163
6164 for (i = 0; i < DASD_CP_ENTRIES; i++) {
6165 if (copy->entry[i].configured &&
6166 strncmp(copy->entry[i].busid, new_busid,
6167 DASD_BUS_ID_SIZE) == 0) {
6168 copy->active = ©->entry[i];
6169 copy->entry[i].primary = true;
6170 } else if (copy->entry[i].configured &&
6171 strncmp(copy->entry[i].busid, old_busid,
6172 DASD_BUS_ID_SIZE) == 0) {
6173 copy->entry[i].primary = false;
6174 }
6175 }
6176 }
6177
6178 /*
6179 * The function will swap the role of a given copy pair.
6180 * During the swap operation the relation of the blockdevice is disconnected
6181 * from the old primary and connected to the new.
6182 *
6183 * IO is paused on the block queue before swap and may be resumed afterwards.
6184 */
dasd_eckd_copy_pair_swap(struct dasd_device * device,char * prim_busid,char * sec_busid)6185 static int dasd_eckd_copy_pair_swap(struct dasd_device *device, char *prim_busid,
6186 char *sec_busid)
6187 {
6188 struct dasd_device *primary, *secondary;
6189 struct dasd_copy_relation *copy;
6190 struct dasd_block *block;
6191 struct gendisk *gdp;
6192
6193 copy = device->copy;
6194 if (!copy)
6195 return DASD_COPYPAIRSWAP_INVALID;
6196 primary = copy->active->device;
6197 if (!primary)
6198 return DASD_COPYPAIRSWAP_INVALID;
6199 /* double check if swap has correct primary */
6200 if (strncmp(dev_name(&primary->cdev->dev), prim_busid, DASD_BUS_ID_SIZE) != 0)
6201 return DASD_COPYPAIRSWAP_PRIMARY;
6202
6203 secondary = copy_relation_find_device(copy, sec_busid);
6204 if (!secondary)
6205 return DASD_COPYPAIRSWAP_SECONDARY;
6206
6207 /*
6208 * usually the device should be quiesced for swap
6209 * for paranoia stop device and requeue requests again
6210 */
6211 dasd_device_set_stop_bits(primary, DASD_STOPPED_PPRC);
6212 dasd_device_set_stop_bits(secondary, DASD_STOPPED_PPRC);
6213 dasd_generic_requeue_all_requests(primary);
6214
6215 /* swap DASD internal device <> block assignment */
6216 block = primary->block;
6217 primary->block = NULL;
6218 secondary->block = block;
6219 block->base = secondary;
6220 /* set new primary device in COPY relation */
6221 copy_pair_set_active(copy, sec_busid, prim_busid);
6222
6223 /* swap blocklayer device link */
6224 gdp = block->gdp;
6225 dasd_add_link_to_gendisk(gdp, secondary);
6226
6227 /* re-enable device */
6228 dasd_device_remove_stop_bits(primary, DASD_STOPPED_PPRC);
6229 dasd_device_remove_stop_bits(secondary, DASD_STOPPED_PPRC);
6230 dasd_schedule_device_bh(secondary);
6231
6232 return DASD_COPYPAIRSWAP_SUCCESS;
6233 }
6234
6235 /*
6236 * Perform Subsystem Function - Peer-to-Peer Remote Copy Extended Query
6237 */
dasd_eckd_query_pprc_status(struct dasd_device * device,struct dasd_pprc_data_sc4 * data)6238 static int dasd_eckd_query_pprc_status(struct dasd_device *device,
6239 struct dasd_pprc_data_sc4 *data)
6240 {
6241 struct dasd_pprc_data_sc4 *pprc_data;
6242 struct dasd_psf_prssd_data *prssdp;
6243 struct dasd_ccw_req *cqr;
6244 struct ccw1 *ccw;
6245 int rc;
6246
6247 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
6248 sizeof(*prssdp) + sizeof(*pprc_data) + 1,
6249 device, NULL);
6250 if (IS_ERR(cqr)) {
6251 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6252 "Could not allocate query PPRC status request");
6253 return PTR_ERR(cqr);
6254 }
6255 cqr->startdev = device;
6256 cqr->memdev = device;
6257 cqr->block = NULL;
6258 cqr->retries = 256;
6259 cqr->expires = 10 * HZ;
6260
6261 /* Prepare for Read Subsystem Data */
6262 prssdp = (struct dasd_psf_prssd_data *)cqr->data;
6263 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
6264 prssdp->order = PSF_ORDER_PRSSD;
6265 prssdp->suborder = PSF_SUBORDER_PPRCEQ;
6266 prssdp->varies[0] = PPRCEQ_SCOPE_4;
6267 pprc_data = (struct dasd_pprc_data_sc4 *)(prssdp + 1);
6268
6269 ccw = cqr->cpaddr;
6270 ccw->cmd_code = DASD_ECKD_CCW_PSF;
6271 ccw->count = sizeof(struct dasd_psf_prssd_data);
6272 ccw->flags |= CCW_FLAG_CC;
6273 ccw->flags |= CCW_FLAG_SLI;
6274 ccw->cda = (__u32)(addr_t)prssdp;
6275
6276 /* Read Subsystem Data - query host access */
6277 ccw++;
6278 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
6279 ccw->count = sizeof(*pprc_data);
6280 ccw->flags |= CCW_FLAG_SLI;
6281 ccw->cda = (__u32)(addr_t)pprc_data;
6282
6283 cqr->buildclk = get_tod_clock();
6284 cqr->status = DASD_CQR_FILLED;
6285
6286 rc = dasd_sleep_on_interruptible(cqr);
6287 if (rc == 0) {
6288 *data = *pprc_data;
6289 } else {
6290 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
6291 "PPRC Extended Query failed with rc=%d\n",
6292 rc);
6293 rc = -EOPNOTSUPP;
6294 }
6295
6296 dasd_sfree_request(cqr, cqr->memdev);
6297 return rc;
6298 }
6299
6300 /*
6301 * ECKD NOP - no operation
6302 */
dasd_eckd_nop(struct dasd_device * device)6303 static int dasd_eckd_nop(struct dasd_device *device)
6304 {
6305 struct dasd_ccw_req *cqr;
6306 struct ccw1 *ccw;
6307 int rc;
6308
6309 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 1, device, NULL);
6310 if (IS_ERR(cqr)) {
6311 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
6312 "Could not allocate NOP request");
6313 return PTR_ERR(cqr);
6314 }
6315 cqr->startdev = device;
6316 cqr->memdev = device;
6317 cqr->block = NULL;
6318 cqr->retries = 1;
6319 cqr->expires = 10 * HZ;
6320
6321 ccw = cqr->cpaddr;
6322 ccw->cmd_code = DASD_ECKD_CCW_NOP;
6323 ccw->flags |= CCW_FLAG_SLI;
6324
6325 cqr->buildclk = get_tod_clock();
6326 cqr->status = DASD_CQR_FILLED;
6327
6328 rc = dasd_sleep_on_interruptible(cqr);
6329 if (rc != 0) {
6330 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
6331 "NOP failed with rc=%d\n", rc);
6332 rc = -EOPNOTSUPP;
6333 }
6334 dasd_sfree_request(cqr, cqr->memdev);
6335 return rc;
6336 }
6337
dasd_eckd_device_ping(struct dasd_device * device)6338 static int dasd_eckd_device_ping(struct dasd_device *device)
6339 {
6340 return dasd_eckd_nop(device);
6341 }
6342
6343 /*
6344 * Perform Subsystem Function - CUIR response
6345 */
6346 static int
dasd_eckd_psf_cuir_response(struct dasd_device * device,int response,__u32 message_id,__u8 lpum)6347 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
6348 __u32 message_id, __u8 lpum)
6349 {
6350 struct dasd_psf_cuir_response *psf_cuir;
6351 int pos = pathmask_to_pos(lpum);
6352 struct dasd_ccw_req *cqr;
6353 struct ccw1 *ccw;
6354 int rc;
6355
6356 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
6357 sizeof(struct dasd_psf_cuir_response),
6358 device, NULL);
6359
6360 if (IS_ERR(cqr)) {
6361 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6362 "Could not allocate PSF-CUIR request");
6363 return PTR_ERR(cqr);
6364 }
6365
6366 psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
6367 psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
6368 psf_cuir->cc = response;
6369 psf_cuir->chpid = device->path[pos].chpid;
6370 psf_cuir->message_id = message_id;
6371 psf_cuir->cssid = device->path[pos].cssid;
6372 psf_cuir->ssid = device->path[pos].ssid;
6373 ccw = cqr->cpaddr;
6374 ccw->cmd_code = DASD_ECKD_CCW_PSF;
6375 ccw->cda = (__u32)virt_to_phys(psf_cuir);
6376 ccw->flags = CCW_FLAG_SLI;
6377 ccw->count = sizeof(struct dasd_psf_cuir_response);
6378
6379 cqr->startdev = device;
6380 cqr->memdev = device;
6381 cqr->block = NULL;
6382 cqr->retries = 256;
6383 cqr->expires = 10*HZ;
6384 cqr->buildclk = get_tod_clock();
6385 cqr->status = DASD_CQR_FILLED;
6386 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
6387
6388 rc = dasd_sleep_on(cqr);
6389
6390 dasd_sfree_request(cqr, cqr->memdev);
6391 return rc;
6392 }
6393
6394 /*
6395 * return configuration data that is referenced by record selector
6396 * if a record selector is specified or per default return the
6397 * conf_data pointer for the path specified by lpum
6398 */
dasd_eckd_get_ref_conf(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6399 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
6400 __u8 lpum,
6401 struct dasd_cuir_message *cuir)
6402 {
6403 struct dasd_conf_data *conf_data;
6404 int path, pos;
6405
6406 if (cuir->record_selector == 0)
6407 goto out;
6408 for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
6409 conf_data = device->path[pos].conf_data;
6410 if (conf_data->gneq.record_selector ==
6411 cuir->record_selector)
6412 return conf_data;
6413 }
6414 out:
6415 return device->path[pathmask_to_pos(lpum)].conf_data;
6416 }
6417
6418 /*
6419 * This function determines the scope of a reconfiguration request by
6420 * analysing the path and device selection data provided in the CUIR request.
6421 * Returns a path mask containing CUIR affected paths for the give device.
6422 *
6423 * If the CUIR request does not contain the required information return the
6424 * path mask of the path the attention message for the CUIR request was reveived
6425 * on.
6426 */
dasd_eckd_cuir_scope(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6427 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
6428 struct dasd_cuir_message *cuir)
6429 {
6430 struct dasd_conf_data *ref_conf_data;
6431 unsigned long bitmask = 0, mask = 0;
6432 struct dasd_conf_data *conf_data;
6433 unsigned int pos, path;
6434 char *ref_gneq, *gneq;
6435 char *ref_ned, *ned;
6436 int tbcpm = 0;
6437
6438 /* if CUIR request does not specify the scope use the path
6439 the attention message was presented on */
6440 if (!cuir->ned_map ||
6441 !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
6442 return lpum;
6443
6444 /* get reference conf data */
6445 ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
6446 /* reference ned is determined by ned_map field */
6447 pos = 8 - ffs(cuir->ned_map);
6448 ref_ned = (char *)&ref_conf_data->neds[pos];
6449 ref_gneq = (char *)&ref_conf_data->gneq;
6450 /* transfer 24 bit neq_map to mask */
6451 mask = cuir->neq_map[2];
6452 mask |= cuir->neq_map[1] << 8;
6453 mask |= cuir->neq_map[0] << 16;
6454
6455 for (path = 0; path < 8; path++) {
6456 /* initialise data per path */
6457 bitmask = mask;
6458 conf_data = device->path[path].conf_data;
6459 pos = 8 - ffs(cuir->ned_map);
6460 ned = (char *) &conf_data->neds[pos];
6461 /* compare reference ned and per path ned */
6462 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
6463 continue;
6464 gneq = (char *)&conf_data->gneq;
6465 /* compare reference gneq and per_path gneq under
6466 24 bit mask where mask bit 0 equals byte 7 of
6467 the gneq and mask bit 24 equals byte 31 */
6468 while (bitmask) {
6469 pos = ffs(bitmask) - 1;
6470 if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
6471 != 0)
6472 break;
6473 clear_bit(pos, &bitmask);
6474 }
6475 if (bitmask)
6476 continue;
6477 /* device and path match the reference values
6478 add path to CUIR scope */
6479 tbcpm |= 0x80 >> path;
6480 }
6481 return tbcpm;
6482 }
6483
dasd_eckd_cuir_notify_user(struct dasd_device * device,unsigned long paths,int action)6484 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
6485 unsigned long paths, int action)
6486 {
6487 int pos;
6488
6489 while (paths) {
6490 /* get position of bit in mask */
6491 pos = 8 - ffs(paths);
6492 /* get channel path descriptor from this position */
6493 if (action == CUIR_QUIESCE)
6494 pr_warn("Service on the storage server caused path %x.%02x to go offline",
6495 device->path[pos].cssid,
6496 device->path[pos].chpid);
6497 else if (action == CUIR_RESUME)
6498 pr_info("Path %x.%02x is back online after service on the storage server",
6499 device->path[pos].cssid,
6500 device->path[pos].chpid);
6501 clear_bit(7 - pos, &paths);
6502 }
6503 }
6504
dasd_eckd_cuir_remove_path(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6505 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
6506 struct dasd_cuir_message *cuir)
6507 {
6508 unsigned long tbcpm;
6509
6510 tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
6511 /* nothing to do if path is not in use */
6512 if (!(dasd_path_get_opm(device) & tbcpm))
6513 return 0;
6514 if (!(dasd_path_get_opm(device) & ~tbcpm)) {
6515 /* no path would be left if the CUIR action is taken
6516 return error */
6517 return -EINVAL;
6518 }
6519 /* remove device from operational path mask */
6520 dasd_path_remove_opm(device, tbcpm);
6521 dasd_path_add_cuirpm(device, tbcpm);
6522 return tbcpm;
6523 }
6524
6525 /*
6526 * walk through all devices and build a path mask to quiesce them
6527 * return an error if the last path to a device would be removed
6528 *
6529 * if only part of the devices are quiesced and an error
6530 * occurs no onlining necessary, the storage server will
6531 * notify the already set offline devices again
6532 */
dasd_eckd_cuir_quiesce(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6533 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
6534 struct dasd_cuir_message *cuir)
6535 {
6536 struct dasd_eckd_private *private = device->private;
6537 struct alias_pav_group *pavgroup, *tempgroup;
6538 struct dasd_device *dev, *n;
6539 unsigned long paths = 0;
6540 unsigned long flags;
6541 int tbcpm;
6542
6543 /* active devices */
6544 list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6545 alias_list) {
6546 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6547 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6548 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6549 if (tbcpm < 0)
6550 goto out_err;
6551 paths |= tbcpm;
6552 }
6553 /* inactive devices */
6554 list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6555 alias_list) {
6556 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6557 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6558 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6559 if (tbcpm < 0)
6560 goto out_err;
6561 paths |= tbcpm;
6562 }
6563 /* devices in PAV groups */
6564 list_for_each_entry_safe(pavgroup, tempgroup,
6565 &private->lcu->grouplist, group) {
6566 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6567 alias_list) {
6568 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6569 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6570 spin_unlock_irqrestore(
6571 get_ccwdev_lock(dev->cdev), flags);
6572 if (tbcpm < 0)
6573 goto out_err;
6574 paths |= tbcpm;
6575 }
6576 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6577 alias_list) {
6578 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6579 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6580 spin_unlock_irqrestore(
6581 get_ccwdev_lock(dev->cdev), flags);
6582 if (tbcpm < 0)
6583 goto out_err;
6584 paths |= tbcpm;
6585 }
6586 }
6587 /* notify user about all paths affected by CUIR action */
6588 dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
6589 return 0;
6590 out_err:
6591 return tbcpm;
6592 }
6593
dasd_eckd_cuir_resume(struct dasd_device * device,__u8 lpum,struct dasd_cuir_message * cuir)6594 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
6595 struct dasd_cuir_message *cuir)
6596 {
6597 struct dasd_eckd_private *private = device->private;
6598 struct alias_pav_group *pavgroup, *tempgroup;
6599 struct dasd_device *dev, *n;
6600 unsigned long paths = 0;
6601 int tbcpm;
6602
6603 /*
6604 * the path may have been added through a generic path event before
6605 * only trigger path verification if the path is not already in use
6606 */
6607 list_for_each_entry_safe(dev, n,
6608 &private->lcu->active_devices,
6609 alias_list) {
6610 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6611 paths |= tbcpm;
6612 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6613 dasd_path_add_tbvpm(dev, tbcpm);
6614 dasd_schedule_device_bh(dev);
6615 }
6616 }
6617 list_for_each_entry_safe(dev, n,
6618 &private->lcu->inactive_devices,
6619 alias_list) {
6620 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6621 paths |= tbcpm;
6622 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6623 dasd_path_add_tbvpm(dev, tbcpm);
6624 dasd_schedule_device_bh(dev);
6625 }
6626 }
6627 /* devices in PAV groups */
6628 list_for_each_entry_safe(pavgroup, tempgroup,
6629 &private->lcu->grouplist,
6630 group) {
6631 list_for_each_entry_safe(dev, n,
6632 &pavgroup->baselist,
6633 alias_list) {
6634 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6635 paths |= tbcpm;
6636 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6637 dasd_path_add_tbvpm(dev, tbcpm);
6638 dasd_schedule_device_bh(dev);
6639 }
6640 }
6641 list_for_each_entry_safe(dev, n,
6642 &pavgroup->aliaslist,
6643 alias_list) {
6644 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6645 paths |= tbcpm;
6646 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6647 dasd_path_add_tbvpm(dev, tbcpm);
6648 dasd_schedule_device_bh(dev);
6649 }
6650 }
6651 }
6652 /* notify user about all paths affected by CUIR action */
6653 dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
6654 return 0;
6655 }
6656
dasd_eckd_handle_cuir(struct dasd_device * device,void * messages,__u8 lpum)6657 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
6658 __u8 lpum)
6659 {
6660 struct dasd_cuir_message *cuir = messages;
6661 int response;
6662
6663 DBF_DEV_EVENT(DBF_WARNING, device,
6664 "CUIR request: %016llx %016llx %016llx %08x",
6665 ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
6666 ((u32 *)cuir)[3]);
6667
6668 if (cuir->code == CUIR_QUIESCE) {
6669 /* quiesce */
6670 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
6671 response = PSF_CUIR_LAST_PATH;
6672 else
6673 response = PSF_CUIR_COMPLETED;
6674 } else if (cuir->code == CUIR_RESUME) {
6675 /* resume */
6676 dasd_eckd_cuir_resume(device, lpum, cuir);
6677 response = PSF_CUIR_COMPLETED;
6678 } else
6679 response = PSF_CUIR_NOT_SUPPORTED;
6680
6681 dasd_eckd_psf_cuir_response(device, response,
6682 cuir->message_id, lpum);
6683 DBF_DEV_EVENT(DBF_WARNING, device,
6684 "CUIR response: %d on message ID %08x", response,
6685 cuir->message_id);
6686 /* to make sure there is no attention left schedule work again */
6687 device->discipline->check_attention(device, lpum);
6688 }
6689
dasd_eckd_oos_resume(struct dasd_device * device)6690 static void dasd_eckd_oos_resume(struct dasd_device *device)
6691 {
6692 struct dasd_eckd_private *private = device->private;
6693 struct alias_pav_group *pavgroup, *tempgroup;
6694 struct dasd_device *dev, *n;
6695 unsigned long flags;
6696
6697 spin_lock_irqsave(&private->lcu->lock, flags);
6698 list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6699 alias_list) {
6700 if (dev->stopped & DASD_STOPPED_NOSPC)
6701 dasd_generic_space_avail(dev);
6702 }
6703 list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6704 alias_list) {
6705 if (dev->stopped & DASD_STOPPED_NOSPC)
6706 dasd_generic_space_avail(dev);
6707 }
6708 /* devices in PAV groups */
6709 list_for_each_entry_safe(pavgroup, tempgroup,
6710 &private->lcu->grouplist,
6711 group) {
6712 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6713 alias_list) {
6714 if (dev->stopped & DASD_STOPPED_NOSPC)
6715 dasd_generic_space_avail(dev);
6716 }
6717 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6718 alias_list) {
6719 if (dev->stopped & DASD_STOPPED_NOSPC)
6720 dasd_generic_space_avail(dev);
6721 }
6722 }
6723 spin_unlock_irqrestore(&private->lcu->lock, flags);
6724 }
6725
dasd_eckd_handle_oos(struct dasd_device * device,void * messages,__u8 lpum)6726 static void dasd_eckd_handle_oos(struct dasd_device *device, void *messages,
6727 __u8 lpum)
6728 {
6729 struct dasd_oos_message *oos = messages;
6730
6731 switch (oos->code) {
6732 case REPO_WARN:
6733 case POOL_WARN:
6734 dev_warn(&device->cdev->dev,
6735 "Extent pool usage has reached a critical value\n");
6736 dasd_eckd_oos_resume(device);
6737 break;
6738 case REPO_EXHAUST:
6739 case POOL_EXHAUST:
6740 dev_warn(&device->cdev->dev,
6741 "Extent pool is exhausted\n");
6742 break;
6743 case REPO_RELIEVE:
6744 case POOL_RELIEVE:
6745 dev_info(&device->cdev->dev,
6746 "Extent pool physical space constraint has been relieved\n");
6747 break;
6748 }
6749
6750 /* In any case, update related data */
6751 dasd_eckd_read_ext_pool_info(device);
6752
6753 /* to make sure there is no attention left schedule work again */
6754 device->discipline->check_attention(device, lpum);
6755 }
6756
dasd_eckd_check_attention_work(struct work_struct * work)6757 static void dasd_eckd_check_attention_work(struct work_struct *work)
6758 {
6759 struct check_attention_work_data *data;
6760 struct dasd_rssd_messages *messages;
6761 struct dasd_device *device;
6762 int rc;
6763
6764 data = container_of(work, struct check_attention_work_data, worker);
6765 device = data->device;
6766 messages = kzalloc(sizeof(*messages), GFP_KERNEL);
6767 if (!messages) {
6768 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6769 "Could not allocate attention message buffer");
6770 goto out;
6771 }
6772 rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
6773 if (rc)
6774 goto out;
6775
6776 if (messages->length == ATTENTION_LENGTH_CUIR &&
6777 messages->format == ATTENTION_FORMAT_CUIR)
6778 dasd_eckd_handle_cuir(device, messages, data->lpum);
6779 if (messages->length == ATTENTION_LENGTH_OOS &&
6780 messages->format == ATTENTION_FORMAT_OOS)
6781 dasd_eckd_handle_oos(device, messages, data->lpum);
6782
6783 out:
6784 dasd_put_device(device);
6785 kfree(messages);
6786 kfree(data);
6787 }
6788
dasd_eckd_check_attention(struct dasd_device * device,__u8 lpum)6789 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
6790 {
6791 struct check_attention_work_data *data;
6792
6793 data = kzalloc(sizeof(*data), GFP_ATOMIC);
6794 if (!data)
6795 return -ENOMEM;
6796 INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
6797 dasd_get_device(device);
6798 data->device = device;
6799 data->lpum = lpum;
6800 schedule_work(&data->worker);
6801 return 0;
6802 }
6803
dasd_eckd_disable_hpf_path(struct dasd_device * device,__u8 lpum)6804 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
6805 {
6806 if (~lpum & dasd_path_get_opm(device)) {
6807 dasd_path_add_nohpfpm(device, lpum);
6808 dasd_path_remove_opm(device, lpum);
6809 dev_err(&device->cdev->dev,
6810 "Channel path %02X lost HPF functionality and is disabled\n",
6811 lpum);
6812 return 1;
6813 }
6814 return 0;
6815 }
6816
dasd_eckd_disable_hpf_device(struct dasd_device * device)6817 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
6818 {
6819 struct dasd_eckd_private *private = device->private;
6820
6821 dev_err(&device->cdev->dev,
6822 "High Performance FICON disabled\n");
6823 private->fcx_max_data = 0;
6824 }
6825
dasd_eckd_hpf_enabled(struct dasd_device * device)6826 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
6827 {
6828 struct dasd_eckd_private *private = device->private;
6829
6830 return private->fcx_max_data ? 1 : 0;
6831 }
6832
dasd_eckd_handle_hpf_error(struct dasd_device * device,struct irb * irb)6833 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
6834 struct irb *irb)
6835 {
6836 struct dasd_eckd_private *private = device->private;
6837
6838 if (!private->fcx_max_data) {
6839 /* sanity check for no HPF, the error makes no sense */
6840 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6841 "Trying to disable HPF for a non HPF device");
6842 return;
6843 }
6844 if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
6845 dasd_eckd_disable_hpf_device(device);
6846 } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
6847 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
6848 return;
6849 dasd_eckd_disable_hpf_device(device);
6850 dasd_path_set_tbvpm(device,
6851 dasd_path_get_hpfpm(device));
6852 }
6853 /*
6854 * prevent that any new I/O ist started on the device and schedule a
6855 * requeue of existing requests
6856 */
6857 dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
6858 dasd_schedule_requeue(device);
6859 }
6860
6861 /*
6862 * Initialize block layer request queue.
6863 */
dasd_eckd_setup_blk_queue(struct dasd_block * block)6864 static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
6865 {
6866 unsigned int logical_block_size = block->bp_block;
6867 struct request_queue *q = block->gdp->queue;
6868 struct dasd_device *device = block->base;
6869 int max;
6870
6871 if (device->features & DASD_FEATURE_USERAW) {
6872 /*
6873 * the max_blocks value for raw_track access is 256
6874 * it is higher than the native ECKD value because we
6875 * only need one ccw per track
6876 * so the max_hw_sectors are
6877 * 2048 x 512B = 1024kB = 16 tracks
6878 */
6879 max = DASD_ECKD_MAX_BLOCKS_RAW << block->s2b_shift;
6880 } else {
6881 max = DASD_ECKD_MAX_BLOCKS << block->s2b_shift;
6882 }
6883 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
6884 q->limits.max_dev_sectors = max;
6885 blk_queue_logical_block_size(q, logical_block_size);
6886 blk_queue_max_hw_sectors(q, max);
6887 blk_queue_max_segments(q, USHRT_MAX);
6888 /* With page sized segments each segment can be translated into one idaw/tidaw */
6889 blk_queue_max_segment_size(q, PAGE_SIZE);
6890 blk_queue_segment_boundary(q, PAGE_SIZE - 1);
6891 }
6892
6893 static struct ccw_driver dasd_eckd_driver = {
6894 .driver = {
6895 .name = "dasd-eckd",
6896 .owner = THIS_MODULE,
6897 .dev_groups = dasd_dev_groups,
6898 },
6899 .ids = dasd_eckd_ids,
6900 .probe = dasd_eckd_probe,
6901 .remove = dasd_generic_remove,
6902 .set_offline = dasd_generic_set_offline,
6903 .set_online = dasd_eckd_set_online,
6904 .notify = dasd_generic_notify,
6905 .path_event = dasd_generic_path_event,
6906 .shutdown = dasd_generic_shutdown,
6907 .uc_handler = dasd_generic_uc_handler,
6908 .int_class = IRQIO_DAS,
6909 };
6910
6911 static struct dasd_discipline dasd_eckd_discipline = {
6912 .owner = THIS_MODULE,
6913 .name = "ECKD",
6914 .ebcname = "ECKD",
6915 .check_device = dasd_eckd_check_characteristics,
6916 .uncheck_device = dasd_eckd_uncheck_device,
6917 .do_analysis = dasd_eckd_do_analysis,
6918 .pe_handler = dasd_eckd_pe_handler,
6919 .basic_to_ready = dasd_eckd_basic_to_ready,
6920 .online_to_ready = dasd_eckd_online_to_ready,
6921 .basic_to_known = dasd_eckd_basic_to_known,
6922 .setup_blk_queue = dasd_eckd_setup_blk_queue,
6923 .fill_geometry = dasd_eckd_fill_geometry,
6924 .start_IO = dasd_start_IO,
6925 .term_IO = dasd_term_IO,
6926 .handle_terminated_request = dasd_eckd_handle_terminated_request,
6927 .format_device = dasd_eckd_format_device,
6928 .check_device_format = dasd_eckd_check_device_format,
6929 .erp_action = dasd_eckd_erp_action,
6930 .erp_postaction = dasd_eckd_erp_postaction,
6931 .check_for_device_change = dasd_eckd_check_for_device_change,
6932 .build_cp = dasd_eckd_build_alias_cp,
6933 .free_cp = dasd_eckd_free_alias_cp,
6934 .dump_sense = dasd_eckd_dump_sense,
6935 .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
6936 .fill_info = dasd_eckd_fill_info,
6937 .ioctl = dasd_eckd_ioctl,
6938 .reload = dasd_eckd_reload_device,
6939 .get_uid = dasd_eckd_get_uid,
6940 .kick_validate = dasd_eckd_kick_validate_server,
6941 .check_attention = dasd_eckd_check_attention,
6942 .host_access_count = dasd_eckd_host_access_count,
6943 .hosts_print = dasd_hosts_print,
6944 .handle_hpf_error = dasd_eckd_handle_hpf_error,
6945 .disable_hpf = dasd_eckd_disable_hpf_device,
6946 .hpf_enabled = dasd_eckd_hpf_enabled,
6947 .reset_path = dasd_eckd_reset_path,
6948 .is_ese = dasd_eckd_is_ese,
6949 .space_allocated = dasd_eckd_space_allocated,
6950 .space_configured = dasd_eckd_space_configured,
6951 .logical_capacity = dasd_eckd_logical_capacity,
6952 .release_space = dasd_eckd_release_space,
6953 .ext_pool_id = dasd_eckd_ext_pool_id,
6954 .ext_size = dasd_eckd_ext_size,
6955 .ext_pool_cap_at_warnlevel = dasd_eckd_ext_pool_cap_at_warnlevel,
6956 .ext_pool_warn_thrshld = dasd_eckd_ext_pool_warn_thrshld,
6957 .ext_pool_oos = dasd_eckd_ext_pool_oos,
6958 .ext_pool_exhaust = dasd_eckd_ext_pool_exhaust,
6959 .ese_format = dasd_eckd_ese_format,
6960 .ese_read = dasd_eckd_ese_read,
6961 .pprc_status = dasd_eckd_query_pprc_status,
6962 .pprc_enabled = dasd_eckd_pprc_enabled,
6963 .copy_pair_swap = dasd_eckd_copy_pair_swap,
6964 .device_ping = dasd_eckd_device_ping,
6965 };
6966
6967 static int __init
dasd_eckd_init(void)6968 dasd_eckd_init(void)
6969 {
6970 int ret;
6971
6972 ASCEBC(dasd_eckd_discipline.ebcname, 4);
6973 dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
6974 GFP_KERNEL | GFP_DMA);
6975 if (!dasd_reserve_req)
6976 return -ENOMEM;
6977 dasd_vol_info_req = kmalloc(sizeof(*dasd_vol_info_req),
6978 GFP_KERNEL | GFP_DMA);
6979 if (!dasd_vol_info_req) {
6980 kfree(dasd_reserve_req);
6981 return -ENOMEM;
6982 }
6983 pe_handler_worker = kmalloc(sizeof(*pe_handler_worker),
6984 GFP_KERNEL | GFP_DMA);
6985 if (!pe_handler_worker) {
6986 kfree(dasd_reserve_req);
6987 kfree(dasd_vol_info_req);
6988 return -ENOMEM;
6989 }
6990 rawpadpage = (void *)__get_free_page(GFP_KERNEL);
6991 if (!rawpadpage) {
6992 kfree(pe_handler_worker);
6993 kfree(dasd_reserve_req);
6994 kfree(dasd_vol_info_req);
6995 return -ENOMEM;
6996 }
6997 ret = ccw_driver_register(&dasd_eckd_driver);
6998 if (!ret)
6999 wait_for_device_probe();
7000 else {
7001 kfree(pe_handler_worker);
7002 kfree(dasd_reserve_req);
7003 kfree(dasd_vol_info_req);
7004 free_page((unsigned long)rawpadpage);
7005 }
7006 return ret;
7007 }
7008
7009 static void __exit
dasd_eckd_cleanup(void)7010 dasd_eckd_cleanup(void)
7011 {
7012 ccw_driver_unregister(&dasd_eckd_driver);
7013 kfree(pe_handler_worker);
7014 kfree(dasd_reserve_req);
7015 free_page((unsigned long)rawpadpage);
7016 }
7017
7018 module_init(dasd_eckd_init);
7019 module_exit(dasd_eckd_cleanup);
7020