1 /*
2  * Copyright (c) 2012, 2013 Intel Corporation.  All rights reserved.
3  * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
4  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
5  *
6  * This software is available to you under a choice of one of two
7  * licenses.  You may choose to be licensed under the terms of the GNU
8  * General Public License (GPL) Version 2, available from the file
9  * COPYING in the main directory of this source tree, or the
10  * OpenIB.org BSD license below:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
20  *      - Redistributions in binary form must reproduce the above
21  *        copyright notice, this list of conditions and the following
22  *        disclaimer in the documentation and/or other materials
23  *        provided with the distribution.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32  * SOFTWARE.
33  */
34 
35 #include <linux/pci.h>
36 #include <linux/netdevice.h>
37 #include <linux/vmalloc.h>
38 #include <linux/delay.h>
39 #include <linux/module.h>
40 #include <linux/printk.h>
41 #ifdef CONFIG_INFINIBAND_QIB_DCA
42 #include <linux/dca.h>
43 #endif
44 #include <rdma/rdma_vt.h>
45 
46 #include "qib.h"
47 #include "qib_common.h"
48 #include "qib_mad.h"
49 #ifdef CONFIG_DEBUG_FS
50 #include "qib_debugfs.h"
51 #include "qib_verbs.h"
52 #endif
53 
54 #undef pr_fmt
55 #define pr_fmt(fmt) QIB_DRV_NAME ": " fmt
56 
57 /*
58  * min buffers we want to have per context, after driver
59  */
60 #define QIB_MIN_USER_CTXT_BUFCNT 7
61 
62 #define QLOGIC_IB_R_SOFTWARE_MASK 0xFF
63 #define QLOGIC_IB_R_SOFTWARE_SHIFT 24
64 #define QLOGIC_IB_R_EMULATOR_MASK (1ULL<<62)
65 
66 /*
67  * Number of ctxts we are configured to use (to allow for more pio
68  * buffers per ctxt, etc.)  Zero means use chip value.
69  */
70 ushort qib_cfgctxts;
71 module_param_named(cfgctxts, qib_cfgctxts, ushort, S_IRUGO);
72 MODULE_PARM_DESC(cfgctxts, "Set max number of contexts to use");
73 
74 unsigned qib_numa_aware;
75 module_param_named(numa_aware, qib_numa_aware, uint, S_IRUGO);
76 MODULE_PARM_DESC(numa_aware,
77 	"0 -> PSM allocation close to HCA, 1 -> PSM allocation local to process");
78 
79 /*
80  * If set, do not write to any regs if avoidable, hack to allow
81  * check for deranged default register values.
82  */
83 ushort qib_mini_init;
84 module_param_named(mini_init, qib_mini_init, ushort, S_IRUGO);
85 MODULE_PARM_DESC(mini_init, "If set, do minimal diag init");
86 
87 unsigned qib_n_krcv_queues;
88 module_param_named(krcvqs, qib_n_krcv_queues, uint, S_IRUGO);
89 MODULE_PARM_DESC(krcvqs, "number of kernel receive queues per IB port");
90 
91 unsigned qib_cc_table_size;
92 module_param_named(cc_table_size, qib_cc_table_size, uint, S_IRUGO);
93 MODULE_PARM_DESC(cc_table_size, "Congestion control table entries 0 (CCA disabled - default), min = 128, max = 1984");
94 
95 static void verify_interrupt(struct timer_list *);
96 
97 DEFINE_XARRAY_FLAGS(qib_dev_table, XA_FLAGS_ALLOC | XA_FLAGS_LOCK_IRQ);
98 u32 qib_cpulist_count;
99 unsigned long *qib_cpulist;
100 
101 /* set number of contexts we'll actually use */
102 void qib_set_ctxtcnt(struct qib_devdata *dd)
103 {
104 	if (!qib_cfgctxts) {
105 		dd->cfgctxts = dd->first_user_ctxt + num_online_cpus();
106 		if (dd->cfgctxts > dd->ctxtcnt)
107 			dd->cfgctxts = dd->ctxtcnt;
108 	} else if (qib_cfgctxts < dd->num_pports)
109 		dd->cfgctxts = dd->ctxtcnt;
110 	else if (qib_cfgctxts <= dd->ctxtcnt)
111 		dd->cfgctxts = qib_cfgctxts;
112 	else
113 		dd->cfgctxts = dd->ctxtcnt;
114 	dd->freectxts = (dd->first_user_ctxt > dd->cfgctxts) ? 0 :
115 		dd->cfgctxts - dd->first_user_ctxt;
116 }
117 
118 /*
119  * Common code for creating the receive context array.
120  */
121 int qib_create_ctxts(struct qib_devdata *dd)
122 {
123 	unsigned i;
124 	int local_node_id = pcibus_to_node(dd->pcidev->bus);
125 
126 	if (local_node_id < 0)
127 		local_node_id = numa_node_id();
128 	dd->assigned_node_id = local_node_id;
129 
130 	/*
131 	 * Allocate full ctxtcnt array, rather than just cfgctxts, because
132 	 * cleanup iterates across all possible ctxts.
133 	 */
134 	dd->rcd = kcalloc(dd->ctxtcnt, sizeof(*dd->rcd), GFP_KERNEL);
135 	if (!dd->rcd)
136 		return -ENOMEM;
137 
138 	/* create (one or more) kctxt */
139 	for (i = 0; i < dd->first_user_ctxt; ++i) {
140 		struct qib_pportdata *ppd;
141 		struct qib_ctxtdata *rcd;
142 
143 		if (dd->skip_kctxt_mask & (1 << i))
144 			continue;
145 
146 		ppd = dd->pport + (i % dd->num_pports);
147 
148 		rcd = qib_create_ctxtdata(ppd, i, dd->assigned_node_id);
149 		if (!rcd) {
150 			qib_dev_err(dd,
151 				"Unable to allocate ctxtdata for Kernel ctxt, failing\n");
152 			kfree(dd->rcd);
153 			dd->rcd = NULL;
154 			return -ENOMEM;
155 		}
156 		rcd->pkeys[0] = QIB_DEFAULT_P_KEY;
157 		rcd->seq_cnt = 1;
158 	}
159 	return 0;
160 }
161 
162 /*
163  * Common code for user and kernel context setup.
164  */
165 struct qib_ctxtdata *qib_create_ctxtdata(struct qib_pportdata *ppd, u32 ctxt,
166 	int node_id)
167 {
168 	struct qib_devdata *dd = ppd->dd;
169 	struct qib_ctxtdata *rcd;
170 
171 	rcd = kzalloc_node(sizeof(*rcd), GFP_KERNEL, node_id);
172 	if (rcd) {
173 		INIT_LIST_HEAD(&rcd->qp_wait_list);
174 		rcd->node_id = node_id;
175 		rcd->ppd = ppd;
176 		rcd->dd = dd;
177 		rcd->cnt = 1;
178 		rcd->ctxt = ctxt;
179 		dd->rcd[ctxt] = rcd;
180 #ifdef CONFIG_DEBUG_FS
181 		if (ctxt < dd->first_user_ctxt) { /* N/A for PSM contexts */
182 			rcd->opstats = kzalloc_node(sizeof(*rcd->opstats),
183 				GFP_KERNEL, node_id);
184 			if (!rcd->opstats) {
185 				kfree(rcd);
186 				qib_dev_err(dd,
187 					"Unable to allocate per ctxt stats buffer\n");
188 				return NULL;
189 			}
190 		}
191 #endif
192 		dd->f_init_ctxt(rcd);
193 
194 		/*
195 		 * To avoid wasting a lot of memory, we allocate 32KB chunks
196 		 * of physically contiguous memory, advance through it until
197 		 * used up and then allocate more.  Of course, we need
198 		 * memory to store those extra pointers, now.  32KB seems to
199 		 * be the most that is "safe" under memory pressure
200 		 * (creating large files and then copying them over
201 		 * NFS while doing lots of MPI jobs).  The OOM killer can
202 		 * get invoked, even though we say we can sleep and this can
203 		 * cause significant system problems....
204 		 */
205 		rcd->rcvegrbuf_size = 0x8000;
206 		rcd->rcvegrbufs_perchunk =
207 			rcd->rcvegrbuf_size / dd->rcvegrbufsize;
208 		rcd->rcvegrbuf_chunks = (rcd->rcvegrcnt +
209 			rcd->rcvegrbufs_perchunk - 1) /
210 			rcd->rcvegrbufs_perchunk;
211 		rcd->rcvegrbufs_perchunk_shift =
212 			ilog2(rcd->rcvegrbufs_perchunk);
213 	}
214 	return rcd;
215 }
216 
217 /*
218  * Common code for initializing the physical port structure.
219  */
220 int qib_init_pportdata(struct qib_pportdata *ppd, struct qib_devdata *dd,
221 			u8 hw_pidx, u8 port)
222 {
223 	int size;
224 
225 	ppd->dd = dd;
226 	ppd->hw_pidx = hw_pidx;
227 	ppd->port = port; /* IB port number, not index */
228 
229 	spin_lock_init(&ppd->sdma_lock);
230 	spin_lock_init(&ppd->lflags_lock);
231 	spin_lock_init(&ppd->cc_shadow_lock);
232 	init_waitqueue_head(&ppd->state_wait);
233 
234 	timer_setup(&ppd->symerr_clear_timer, qib_clear_symerror_on_linkup, 0);
235 
236 	ppd->qib_wq = NULL;
237 	ppd->ibport_data.pmastats =
238 		alloc_percpu(struct qib_pma_counters);
239 	if (!ppd->ibport_data.pmastats)
240 		return -ENOMEM;
241 	ppd->ibport_data.rvp.rc_acks = alloc_percpu(u64);
242 	ppd->ibport_data.rvp.rc_qacks = alloc_percpu(u64);
243 	ppd->ibport_data.rvp.rc_delayed_comp = alloc_percpu(u64);
244 	if (!(ppd->ibport_data.rvp.rc_acks) ||
245 	    !(ppd->ibport_data.rvp.rc_qacks) ||
246 	    !(ppd->ibport_data.rvp.rc_delayed_comp))
247 		return -ENOMEM;
248 
249 	if (qib_cc_table_size < IB_CCT_MIN_ENTRIES)
250 		goto bail;
251 
252 	ppd->cc_supported_table_entries = min(max_t(int, qib_cc_table_size,
253 		IB_CCT_MIN_ENTRIES), IB_CCT_ENTRIES*IB_CC_TABLE_CAP_DEFAULT);
254 
255 	ppd->cc_max_table_entries =
256 		ppd->cc_supported_table_entries/IB_CCT_ENTRIES;
257 
258 	size = IB_CC_TABLE_CAP_DEFAULT * sizeof(struct ib_cc_table_entry)
259 		* IB_CCT_ENTRIES;
260 	ppd->ccti_entries = kzalloc(size, GFP_KERNEL);
261 	if (!ppd->ccti_entries)
262 		goto bail;
263 
264 	size = IB_CC_CCS_ENTRIES * sizeof(struct ib_cc_congestion_entry);
265 	ppd->congestion_entries = kzalloc(size, GFP_KERNEL);
266 	if (!ppd->congestion_entries)
267 		goto bail_1;
268 
269 	size = sizeof(struct cc_table_shadow);
270 	ppd->ccti_entries_shadow = kzalloc(size, GFP_KERNEL);
271 	if (!ppd->ccti_entries_shadow)
272 		goto bail_2;
273 
274 	size = sizeof(struct ib_cc_congestion_setting_attr);
275 	ppd->congestion_entries_shadow = kzalloc(size, GFP_KERNEL);
276 	if (!ppd->congestion_entries_shadow)
277 		goto bail_3;
278 
279 	return 0;
280 
281 bail_3:
282 	kfree(ppd->ccti_entries_shadow);
283 	ppd->ccti_entries_shadow = NULL;
284 bail_2:
285 	kfree(ppd->congestion_entries);
286 	ppd->congestion_entries = NULL;
287 bail_1:
288 	kfree(ppd->ccti_entries);
289 	ppd->ccti_entries = NULL;
290 bail:
291 	/* User is intentionally disabling the congestion control agent */
292 	if (!qib_cc_table_size)
293 		return 0;
294 
295 	if (qib_cc_table_size < IB_CCT_MIN_ENTRIES) {
296 		qib_cc_table_size = 0;
297 		qib_dev_err(dd,
298 		 "Congestion Control table size %d less than minimum %d for port %d\n",
299 		 qib_cc_table_size, IB_CCT_MIN_ENTRIES, port);
300 	}
301 
302 	qib_dev_err(dd, "Congestion Control Agent disabled for port %d\n",
303 		port);
304 	return 0;
305 }
306 
307 static int init_pioavailregs(struct qib_devdata *dd)
308 {
309 	int ret, pidx;
310 	u64 *status_page;
311 
312 	dd->pioavailregs_dma = dma_alloc_coherent(
313 		&dd->pcidev->dev, PAGE_SIZE, &dd->pioavailregs_phys,
314 		GFP_KERNEL);
315 	if (!dd->pioavailregs_dma) {
316 		qib_dev_err(dd,
317 			"failed to allocate PIOavail reg area in memory\n");
318 		ret = -ENOMEM;
319 		goto done;
320 	}
321 
322 	/*
323 	 * We really want L2 cache aligned, but for current CPUs of
324 	 * interest, they are the same.
325 	 */
326 	status_page = (u64 *)
327 		((char *) dd->pioavailregs_dma +
328 		 ((2 * L1_CACHE_BYTES +
329 		   dd->pioavregs * sizeof(u64)) & ~L1_CACHE_BYTES));
330 	/* device status comes first, for backwards compatibility */
331 	dd->devstatusp = status_page;
332 	*status_page++ = 0;
333 	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
334 		dd->pport[pidx].statusp = status_page;
335 		*status_page++ = 0;
336 	}
337 
338 	/*
339 	 * Setup buffer to hold freeze and other messages, accessible to
340 	 * apps, following statusp.  This is per-unit, not per port.
341 	 */
342 	dd->freezemsg = (char *) status_page;
343 	*dd->freezemsg = 0;
344 	/* length of msg buffer is "whatever is left" */
345 	ret = (char *) status_page - (char *) dd->pioavailregs_dma;
346 	dd->freezelen = PAGE_SIZE - ret;
347 
348 	ret = 0;
349 
350 done:
351 	return ret;
352 }
353 
354 /**
355  * init_shadow_tids - allocate the shadow TID array
356  * @dd: the qlogic_ib device
357  *
358  * allocate the shadow TID array, so we can qib_munlock previous
359  * entries.  It may make more sense to move the pageshadow to the
360  * ctxt data structure, so we only allocate memory for ctxts actually
361  * in use, since we at 8k per ctxt, now.
362  * We don't want failures here to prevent use of the driver/chip,
363  * so no return value.
364  */
365 static void init_shadow_tids(struct qib_devdata *dd)
366 {
367 	struct page **pages;
368 	dma_addr_t *addrs;
369 
370 	pages = vzalloc(array_size(sizeof(struct page *),
371 				   dd->cfgctxts * dd->rcvtidcnt));
372 	if (!pages)
373 		goto bail;
374 
375 	addrs = vzalloc(array_size(sizeof(dma_addr_t),
376 				   dd->cfgctxts * dd->rcvtidcnt));
377 	if (!addrs)
378 		goto bail_free;
379 
380 	dd->pageshadow = pages;
381 	dd->physshadow = addrs;
382 	return;
383 
384 bail_free:
385 	vfree(pages);
386 bail:
387 	dd->pageshadow = NULL;
388 }
389 
390 /*
391  * Do initialization for device that is only needed on
392  * first detect, not on resets.
393  */
394 static int loadtime_init(struct qib_devdata *dd)
395 {
396 	int ret = 0;
397 
398 	if (((dd->revision >> QLOGIC_IB_R_SOFTWARE_SHIFT) &
399 	     QLOGIC_IB_R_SOFTWARE_MASK) != QIB_CHIP_SWVERSION) {
400 		qib_dev_err(dd,
401 			"Driver only handles version %d, chip swversion is %d (%llx), failing\n",
402 			QIB_CHIP_SWVERSION,
403 			(int)(dd->revision >>
404 				QLOGIC_IB_R_SOFTWARE_SHIFT) &
405 				QLOGIC_IB_R_SOFTWARE_MASK,
406 			(unsigned long long) dd->revision);
407 		ret = -ENOSYS;
408 		goto done;
409 	}
410 
411 	if (dd->revision & QLOGIC_IB_R_EMULATOR_MASK)
412 		qib_devinfo(dd->pcidev, "%s", dd->boardversion);
413 
414 	spin_lock_init(&dd->pioavail_lock);
415 	spin_lock_init(&dd->sendctrl_lock);
416 	spin_lock_init(&dd->uctxt_lock);
417 	spin_lock_init(&dd->qib_diag_trans_lock);
418 	spin_lock_init(&dd->eep_st_lock);
419 	mutex_init(&dd->eep_lock);
420 
421 	if (qib_mini_init)
422 		goto done;
423 
424 	ret = init_pioavailregs(dd);
425 	init_shadow_tids(dd);
426 
427 	qib_get_eeprom_info(dd);
428 
429 	/* setup time (don't start yet) to verify we got interrupt */
430 	timer_setup(&dd->intrchk_timer, verify_interrupt, 0);
431 done:
432 	return ret;
433 }
434 
435 /**
436  * init_after_reset - re-initialize after a reset
437  * @dd: the qlogic_ib device
438  *
439  * sanity check at least some of the values after reset, and
440  * ensure no receive or transmit (explicitly, in case reset
441  * failed
442  */
443 static int init_after_reset(struct qib_devdata *dd)
444 {
445 	int i;
446 
447 	/*
448 	 * Ensure chip does no sends or receives, tail updates, or
449 	 * pioavail updates while we re-initialize.  This is mostly
450 	 * for the driver data structures, not chip registers.
451 	 */
452 	for (i = 0; i < dd->num_pports; ++i) {
453 		/*
454 		 * ctxt == -1 means "all contexts". Only really safe for
455 		 * _dis_abling things, as here.
456 		 */
457 		dd->f_rcvctrl(dd->pport + i, QIB_RCVCTRL_CTXT_DIS |
458 				  QIB_RCVCTRL_INTRAVAIL_DIS |
459 				  QIB_RCVCTRL_TAILUPD_DIS, -1);
460 		/* Redundant across ports for some, but no big deal.  */
461 		dd->f_sendctrl(dd->pport + i, QIB_SENDCTRL_SEND_DIS |
462 			QIB_SENDCTRL_AVAIL_DIS);
463 	}
464 
465 	return 0;
466 }
467 
468 static void enable_chip(struct qib_devdata *dd)
469 {
470 	u64 rcvmask;
471 	int i;
472 
473 	/*
474 	 * Enable PIO send, and update of PIOavail regs to memory.
475 	 */
476 	for (i = 0; i < dd->num_pports; ++i)
477 		dd->f_sendctrl(dd->pport + i, QIB_SENDCTRL_SEND_ENB |
478 			QIB_SENDCTRL_AVAIL_ENB);
479 	/*
480 	 * Enable kernel ctxts' receive and receive interrupt.
481 	 * Other ctxts done as user opens and inits them.
482 	 */
483 	rcvmask = QIB_RCVCTRL_CTXT_ENB | QIB_RCVCTRL_INTRAVAIL_ENB;
484 	rcvmask |= (dd->flags & QIB_NODMA_RTAIL) ?
485 		  QIB_RCVCTRL_TAILUPD_DIS : QIB_RCVCTRL_TAILUPD_ENB;
486 	for (i = 0; dd->rcd && i < dd->first_user_ctxt; ++i) {
487 		struct qib_ctxtdata *rcd = dd->rcd[i];
488 
489 		if (rcd)
490 			dd->f_rcvctrl(rcd->ppd, rcvmask, i);
491 	}
492 }
493 
494 static void verify_interrupt(struct timer_list *t)
495 {
496 	struct qib_devdata *dd = from_timer(dd, t, intrchk_timer);
497 	u64 int_counter;
498 
499 	if (!dd)
500 		return; /* being torn down */
501 
502 	/*
503 	 * If we don't have a lid or any interrupts, let the user know and
504 	 * don't bother checking again.
505 	 */
506 	int_counter = qib_int_counter(dd) - dd->z_int_counter;
507 	if (int_counter == 0) {
508 		if (!dd->f_intr_fallback(dd))
509 			dev_err(&dd->pcidev->dev,
510 				"No interrupts detected, not usable.\n");
511 		else /* re-arm the timer to see if fallback works */
512 			mod_timer(&dd->intrchk_timer, jiffies + HZ/2);
513 	}
514 }
515 
516 static void init_piobuf_state(struct qib_devdata *dd)
517 {
518 	int i, pidx;
519 	u32 uctxts;
520 
521 	/*
522 	 * Ensure all buffers are free, and fifos empty.  Buffers
523 	 * are common, so only do once for port 0.
524 	 *
525 	 * After enable and qib_chg_pioavailkernel so we can safely
526 	 * enable pioavail updates and PIOENABLE.  After this, packets
527 	 * are ready and able to go out.
528 	 */
529 	dd->f_sendctrl(dd->pport, QIB_SENDCTRL_DISARM_ALL);
530 	for (pidx = 0; pidx < dd->num_pports; ++pidx)
531 		dd->f_sendctrl(dd->pport + pidx, QIB_SENDCTRL_FLUSH);
532 
533 	/*
534 	 * If not all sendbufs are used, add the one to each of the lower
535 	 * numbered contexts.  pbufsctxt and lastctxt_piobuf are
536 	 * calculated in chip-specific code because it may cause some
537 	 * chip-specific adjustments to be made.
538 	 */
539 	uctxts = dd->cfgctxts - dd->first_user_ctxt;
540 	dd->ctxts_extrabuf = dd->pbufsctxt ?
541 		dd->lastctxt_piobuf - (dd->pbufsctxt * uctxts) : 0;
542 
543 	/*
544 	 * Set up the shadow copies of the piobufavail registers,
545 	 * which we compare against the chip registers for now, and
546 	 * the in memory DMA'ed copies of the registers.
547 	 * By now pioavail updates to memory should have occurred, so
548 	 * copy them into our working/shadow registers; this is in
549 	 * case something went wrong with abort, but mostly to get the
550 	 * initial values of the generation bit correct.
551 	 */
552 	for (i = 0; i < dd->pioavregs; i++) {
553 		__le64 tmp;
554 
555 		tmp = dd->pioavailregs_dma[i];
556 		/*
557 		 * Don't need to worry about pioavailkernel here
558 		 * because we will call qib_chg_pioavailkernel() later
559 		 * in initialization, to busy out buffers as needed.
560 		 */
561 		dd->pioavailshadow[i] = le64_to_cpu(tmp);
562 	}
563 	while (i < ARRAY_SIZE(dd->pioavailshadow))
564 		dd->pioavailshadow[i++] = 0; /* for debugging sanity */
565 
566 	/* after pioavailshadow is setup */
567 	qib_chg_pioavailkernel(dd, 0, dd->piobcnt2k + dd->piobcnt4k,
568 			       TXCHK_CHG_TYPE_KERN, NULL);
569 	dd->f_initvl15_bufs(dd);
570 }
571 
572 /**
573  * qib_create_workqueues - create per port workqueues
574  * @dd: the qlogic_ib device
575  */
576 static int qib_create_workqueues(struct qib_devdata *dd)
577 {
578 	int pidx;
579 	struct qib_pportdata *ppd;
580 
581 	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
582 		ppd = dd->pport + pidx;
583 		if (!ppd->qib_wq) {
584 			char wq_name[8]; /* 3 + 2 + 1 + 1 + 1 */
585 
586 			snprintf(wq_name, sizeof(wq_name), "qib%d_%d",
587 				dd->unit, pidx);
588 			ppd->qib_wq = alloc_ordered_workqueue(wq_name,
589 							      WQ_MEM_RECLAIM);
590 			if (!ppd->qib_wq)
591 				goto wq_error;
592 		}
593 	}
594 	return 0;
595 wq_error:
596 	pr_err("create_singlethread_workqueue failed for port %d\n",
597 		pidx + 1);
598 	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
599 		ppd = dd->pport + pidx;
600 		if (ppd->qib_wq) {
601 			destroy_workqueue(ppd->qib_wq);
602 			ppd->qib_wq = NULL;
603 		}
604 	}
605 	return -ENOMEM;
606 }
607 
608 static void qib_free_pportdata(struct qib_pportdata *ppd)
609 {
610 	free_percpu(ppd->ibport_data.pmastats);
611 	free_percpu(ppd->ibport_data.rvp.rc_acks);
612 	free_percpu(ppd->ibport_data.rvp.rc_qacks);
613 	free_percpu(ppd->ibport_data.rvp.rc_delayed_comp);
614 	ppd->ibport_data.pmastats = NULL;
615 }
616 
617 /**
618  * qib_init - do the actual initialization sequence on the chip
619  * @dd: the qlogic_ib device
620  * @reinit: reinitializing, so don't allocate new memory
621  *
622  * Do the actual initialization sequence on the chip.  This is done
623  * both from the init routine called from the PCI infrastructure, and
624  * when we reset the chip, or detect that it was reset internally,
625  * or it's administratively re-enabled.
626  *
627  * Memory allocation here and in called routines is only done in
628  * the first case (reinit == 0).  We have to be careful, because even
629  * without memory allocation, we need to re-write all the chip registers
630  * TIDs, etc. after the reset or enable has completed.
631  */
632 int qib_init(struct qib_devdata *dd, int reinit)
633 {
634 	int ret = 0, pidx, lastfail = 0;
635 	u32 portok = 0;
636 	unsigned i;
637 	struct qib_ctxtdata *rcd;
638 	struct qib_pportdata *ppd;
639 	unsigned long flags;
640 
641 	/* Set linkstate to unknown, so we can watch for a transition. */
642 	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
643 		ppd = dd->pport + pidx;
644 		spin_lock_irqsave(&ppd->lflags_lock, flags);
645 		ppd->lflags &= ~(QIBL_LINKACTIVE | QIBL_LINKARMED |
646 				 QIBL_LINKDOWN | QIBL_LINKINIT |
647 				 QIBL_LINKV);
648 		spin_unlock_irqrestore(&ppd->lflags_lock, flags);
649 	}
650 
651 	if (reinit)
652 		ret = init_after_reset(dd);
653 	else
654 		ret = loadtime_init(dd);
655 	if (ret)
656 		goto done;
657 
658 	/* Bypass most chip-init, to get to device creation */
659 	if (qib_mini_init)
660 		return 0;
661 
662 	ret = dd->f_late_initreg(dd);
663 	if (ret)
664 		goto done;
665 
666 	/* dd->rcd can be NULL if early init failed */
667 	for (i = 0; dd->rcd && i < dd->first_user_ctxt; ++i) {
668 		/*
669 		 * Set up the (kernel) rcvhdr queue and egr TIDs.  If doing
670 		 * re-init, the simplest way to handle this is to free
671 		 * existing, and re-allocate.
672 		 * Need to re-create rest of ctxt 0 ctxtdata as well.
673 		 */
674 		rcd = dd->rcd[i];
675 		if (!rcd)
676 			continue;
677 
678 		lastfail = qib_create_rcvhdrq(dd, rcd);
679 		if (!lastfail)
680 			lastfail = qib_setup_eagerbufs(rcd);
681 		if (lastfail)
682 			qib_dev_err(dd,
683 				"failed to allocate kernel ctxt's rcvhdrq and/or egr bufs\n");
684 	}
685 
686 	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
687 		int mtu;
688 
689 		if (lastfail)
690 			ret = lastfail;
691 		ppd = dd->pport + pidx;
692 		mtu = ib_mtu_enum_to_int(qib_ibmtu);
693 		if (mtu == -1) {
694 			mtu = QIB_DEFAULT_MTU;
695 			qib_ibmtu = 0; /* don't leave invalid value */
696 		}
697 		/* set max we can ever have for this driver load */
698 		ppd->init_ibmaxlen = min(mtu > 2048 ?
699 					 dd->piosize4k : dd->piosize2k,
700 					 dd->rcvegrbufsize +
701 					 (dd->rcvhdrentsize << 2));
702 		/*
703 		 * Have to initialize ibmaxlen, but this will normally
704 		 * change immediately in qib_set_mtu().
705 		 */
706 		ppd->ibmaxlen = ppd->init_ibmaxlen;
707 		qib_set_mtu(ppd, mtu);
708 
709 		spin_lock_irqsave(&ppd->lflags_lock, flags);
710 		ppd->lflags |= QIBL_IB_LINK_DISABLED;
711 		spin_unlock_irqrestore(&ppd->lflags_lock, flags);
712 
713 		lastfail = dd->f_bringup_serdes(ppd);
714 		if (lastfail) {
715 			qib_devinfo(dd->pcidev,
716 				 "Failed to bringup IB port %u\n", ppd->port);
717 			lastfail = -ENETDOWN;
718 			continue;
719 		}
720 
721 		portok++;
722 	}
723 
724 	if (!portok) {
725 		/* none of the ports initialized */
726 		if (!ret && lastfail)
727 			ret = lastfail;
728 		else if (!ret)
729 			ret = -ENETDOWN;
730 		/* but continue on, so we can debug cause */
731 	}
732 
733 	enable_chip(dd);
734 
735 	init_piobuf_state(dd);
736 
737 done:
738 	if (!ret) {
739 		/* chip is OK for user apps; mark it as initialized */
740 		for (pidx = 0; pidx < dd->num_pports; ++pidx) {
741 			ppd = dd->pport + pidx;
742 			/*
743 			 * Set status even if port serdes is not initialized
744 			 * so that diags will work.
745 			 */
746 			*ppd->statusp |= QIB_STATUS_CHIP_PRESENT |
747 				QIB_STATUS_INITTED;
748 			if (!ppd->link_speed_enabled)
749 				continue;
750 			if (dd->flags & QIB_HAS_SEND_DMA)
751 				ret = qib_setup_sdma(ppd);
752 			timer_setup(&ppd->hol_timer, qib_hol_event, 0);
753 			ppd->hol_state = QIB_HOL_UP;
754 		}
755 
756 		/* now we can enable all interrupts from the chip */
757 		dd->f_set_intr_state(dd, 1);
758 
759 		/*
760 		 * Setup to verify we get an interrupt, and fallback
761 		 * to an alternate if necessary and possible.
762 		 */
763 		mod_timer(&dd->intrchk_timer, jiffies + HZ/2);
764 		/* start stats retrieval timer */
765 		mod_timer(&dd->stats_timer, jiffies + HZ * ACTIVITY_TIMER);
766 	}
767 
768 	/* if ret is non-zero, we probably should do some cleanup here... */
769 	return ret;
770 }
771 
772 /*
773  * These next two routines are placeholders in case we don't have per-arch
774  * code for controlling write combining.  If explicit control of write
775  * combining is not available, performance will probably be awful.
776  */
777 
778 int __attribute__((weak)) qib_enable_wc(struct qib_devdata *dd)
779 {
780 	return -EOPNOTSUPP;
781 }
782 
783 void __attribute__((weak)) qib_disable_wc(struct qib_devdata *dd)
784 {
785 }
786 
787 struct qib_devdata *qib_lookup(int unit)
788 {
789 	return xa_load(&qib_dev_table, unit);
790 }
791 
792 /*
793  * Stop the timers during unit shutdown, or after an error late
794  * in initialization.
795  */
796 static void qib_stop_timers(struct qib_devdata *dd)
797 {
798 	struct qib_pportdata *ppd;
799 	int pidx;
800 
801 	if (dd->stats_timer.function)
802 		del_timer_sync(&dd->stats_timer);
803 	if (dd->intrchk_timer.function)
804 		del_timer_sync(&dd->intrchk_timer);
805 	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
806 		ppd = dd->pport + pidx;
807 		if (ppd->hol_timer.function)
808 			del_timer_sync(&ppd->hol_timer);
809 		if (ppd->led_override_timer.function) {
810 			del_timer_sync(&ppd->led_override_timer);
811 			atomic_set(&ppd->led_override_timer_active, 0);
812 		}
813 		if (ppd->symerr_clear_timer.function)
814 			del_timer_sync(&ppd->symerr_clear_timer);
815 	}
816 }
817 
818 /**
819  * qib_shutdown_device - shut down a device
820  * @dd: the qlogic_ib device
821  *
822  * This is called to make the device quiet when we are about to
823  * unload the driver, and also when the device is administratively
824  * disabled.   It does not free any data structures.
825  * Everything it does has to be setup again by qib_init(dd, 1)
826  */
827 static void qib_shutdown_device(struct qib_devdata *dd)
828 {
829 	struct qib_pportdata *ppd;
830 	unsigned pidx;
831 
832 	if (dd->flags & QIB_SHUTDOWN)
833 		return;
834 	dd->flags |= QIB_SHUTDOWN;
835 
836 	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
837 		ppd = dd->pport + pidx;
838 
839 		spin_lock_irq(&ppd->lflags_lock);
840 		ppd->lflags &= ~(QIBL_LINKDOWN | QIBL_LINKINIT |
841 				 QIBL_LINKARMED | QIBL_LINKACTIVE |
842 				 QIBL_LINKV);
843 		spin_unlock_irq(&ppd->lflags_lock);
844 		*ppd->statusp &= ~(QIB_STATUS_IB_CONF | QIB_STATUS_IB_READY);
845 	}
846 	dd->flags &= ~QIB_INITTED;
847 
848 	/* mask interrupts, but not errors */
849 	dd->f_set_intr_state(dd, 0);
850 
851 	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
852 		ppd = dd->pport + pidx;
853 		dd->f_rcvctrl(ppd, QIB_RCVCTRL_TAILUPD_DIS |
854 				   QIB_RCVCTRL_CTXT_DIS |
855 				   QIB_RCVCTRL_INTRAVAIL_DIS |
856 				   QIB_RCVCTRL_PKEY_ENB, -1);
857 		/*
858 		 * Gracefully stop all sends allowing any in progress to
859 		 * trickle out first.
860 		 */
861 		dd->f_sendctrl(ppd, QIB_SENDCTRL_CLEAR);
862 	}
863 
864 	/*
865 	 * Enough for anything that's going to trickle out to have actually
866 	 * done so.
867 	 */
868 	udelay(20);
869 
870 	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
871 		ppd = dd->pport + pidx;
872 		dd->f_setextled(ppd, 0); /* make sure LEDs are off */
873 
874 		if (dd->flags & QIB_HAS_SEND_DMA)
875 			qib_teardown_sdma(ppd);
876 
877 		dd->f_sendctrl(ppd, QIB_SENDCTRL_AVAIL_DIS |
878 				    QIB_SENDCTRL_SEND_DIS);
879 		/*
880 		 * Clear SerdesEnable.
881 		 * We can't count on interrupts since we are stopping.
882 		 */
883 		dd->f_quiet_serdes(ppd);
884 
885 		if (ppd->qib_wq) {
886 			destroy_workqueue(ppd->qib_wq);
887 			ppd->qib_wq = NULL;
888 		}
889 		qib_free_pportdata(ppd);
890 	}
891 
892 }
893 
894 /**
895  * qib_free_ctxtdata - free a context's allocated data
896  * @dd: the qlogic_ib device
897  * @rcd: the ctxtdata structure
898  *
899  * free up any allocated data for a context
900  * This should not touch anything that would affect a simultaneous
901  * re-allocation of context data, because it is called after qib_mutex
902  * is released (and can be called from reinit as well).
903  * It should never change any chip state, or global driver state.
904  */
905 void qib_free_ctxtdata(struct qib_devdata *dd, struct qib_ctxtdata *rcd)
906 {
907 	if (!rcd)
908 		return;
909 
910 	if (rcd->rcvhdrq) {
911 		dma_free_coherent(&dd->pcidev->dev, rcd->rcvhdrq_size,
912 				  rcd->rcvhdrq, rcd->rcvhdrq_phys);
913 		rcd->rcvhdrq = NULL;
914 		if (rcd->rcvhdrtail_kvaddr) {
915 			dma_free_coherent(&dd->pcidev->dev, PAGE_SIZE,
916 					  rcd->rcvhdrtail_kvaddr,
917 					  rcd->rcvhdrqtailaddr_phys);
918 			rcd->rcvhdrtail_kvaddr = NULL;
919 		}
920 	}
921 	if (rcd->rcvegrbuf) {
922 		unsigned e;
923 
924 		for (e = 0; e < rcd->rcvegrbuf_chunks; e++) {
925 			void *base = rcd->rcvegrbuf[e];
926 			size_t size = rcd->rcvegrbuf_size;
927 
928 			dma_free_coherent(&dd->pcidev->dev, size,
929 					  base, rcd->rcvegrbuf_phys[e]);
930 		}
931 		kfree(rcd->rcvegrbuf);
932 		rcd->rcvegrbuf = NULL;
933 		kfree(rcd->rcvegrbuf_phys);
934 		rcd->rcvegrbuf_phys = NULL;
935 		rcd->rcvegrbuf_chunks = 0;
936 	}
937 
938 	kfree(rcd->tid_pg_list);
939 	vfree(rcd->user_event_mask);
940 	vfree(rcd->subctxt_uregbase);
941 	vfree(rcd->subctxt_rcvegrbuf);
942 	vfree(rcd->subctxt_rcvhdr_base);
943 #ifdef CONFIG_DEBUG_FS
944 	kfree(rcd->opstats);
945 	rcd->opstats = NULL;
946 #endif
947 	kfree(rcd);
948 }
949 
950 /*
951  * Perform a PIO buffer bandwidth write test, to verify proper system
952  * configuration.  Even when all the setup calls work, occasionally
953  * BIOS or other issues can prevent write combining from working, or
954  * can cause other bandwidth problems to the chip.
955  *
956  * This test simply writes the same buffer over and over again, and
957  * measures close to the peak bandwidth to the chip (not testing
958  * data bandwidth to the wire).   On chips that use an address-based
959  * trigger to send packets to the wire, this is easy.  On chips that
960  * use a count to trigger, we want to make sure that the packet doesn't
961  * go out on the wire, or trigger flow control checks.
962  */
963 static void qib_verify_pioperf(struct qib_devdata *dd)
964 {
965 	u32 pbnum, cnt, lcnt;
966 	u32 __iomem *piobuf;
967 	u32 *addr;
968 	u64 msecs, emsecs;
969 
970 	piobuf = dd->f_getsendbuf(dd->pport, 0ULL, &pbnum);
971 	if (!piobuf) {
972 		qib_devinfo(dd->pcidev,
973 			 "No PIObufs for checking perf, skipping\n");
974 		return;
975 	}
976 
977 	/*
978 	 * Enough to give us a reasonable test, less than piobuf size, and
979 	 * likely multiple of store buffer length.
980 	 */
981 	cnt = 1024;
982 
983 	addr = vmalloc(cnt);
984 	if (!addr)
985 		goto done;
986 
987 	preempt_disable();  /* we want reasonably accurate elapsed time */
988 	msecs = 1 + jiffies_to_msecs(jiffies);
989 	for (lcnt = 0; lcnt < 10000U; lcnt++) {
990 		/* wait until we cross msec boundary */
991 		if (jiffies_to_msecs(jiffies) >= msecs)
992 			break;
993 		udelay(1);
994 	}
995 
996 	dd->f_set_armlaunch(dd, 0);
997 
998 	/*
999 	 * length 0, no dwords actually sent
1000 	 */
1001 	writeq(0, piobuf);
1002 	qib_flush_wc();
1003 
1004 	/*
1005 	 * This is only roughly accurate, since even with preempt we
1006 	 * still take interrupts that could take a while.   Running for
1007 	 * >= 5 msec seems to get us "close enough" to accurate values.
1008 	 */
1009 	msecs = jiffies_to_msecs(jiffies);
1010 	for (emsecs = lcnt = 0; emsecs <= 5UL; lcnt++) {
1011 		qib_pio_copy(piobuf + 64, addr, cnt >> 2);
1012 		emsecs = jiffies_to_msecs(jiffies) - msecs;
1013 	}
1014 
1015 	/* 1 GiB/sec, slightly over IB SDR line rate */
1016 	if (lcnt < (emsecs * 1024U))
1017 		qib_dev_err(dd,
1018 			    "Performance problem: bandwidth to PIO buffers is only %u MiB/sec\n",
1019 			    lcnt / (u32) emsecs);
1020 
1021 	preempt_enable();
1022 
1023 	vfree(addr);
1024 
1025 done:
1026 	/* disarm piobuf, so it's available again */
1027 	dd->f_sendctrl(dd->pport, QIB_SENDCTRL_DISARM_BUF(pbnum));
1028 	qib_sendbuf_done(dd, pbnum);
1029 	dd->f_set_armlaunch(dd, 1);
1030 }
1031 
1032 void qib_free_devdata(struct qib_devdata *dd)
1033 {
1034 	unsigned long flags;
1035 
1036 	xa_lock_irqsave(&qib_dev_table, flags);
1037 	__xa_erase(&qib_dev_table, dd->unit);
1038 	xa_unlock_irqrestore(&qib_dev_table, flags);
1039 
1040 #ifdef CONFIG_DEBUG_FS
1041 	qib_dbg_ibdev_exit(&dd->verbs_dev);
1042 #endif
1043 	free_percpu(dd->int_counter);
1044 	rvt_dealloc_device(&dd->verbs_dev.rdi);
1045 }
1046 
1047 u64 qib_int_counter(struct qib_devdata *dd)
1048 {
1049 	int cpu;
1050 	u64 int_counter = 0;
1051 
1052 	for_each_possible_cpu(cpu)
1053 		int_counter += *per_cpu_ptr(dd->int_counter, cpu);
1054 	return int_counter;
1055 }
1056 
1057 u64 qib_sps_ints(void)
1058 {
1059 	unsigned long index, flags;
1060 	struct qib_devdata *dd;
1061 	u64 sps_ints = 0;
1062 
1063 	xa_lock_irqsave(&qib_dev_table, flags);
1064 	xa_for_each(&qib_dev_table, index, dd) {
1065 		sps_ints += qib_int_counter(dd);
1066 	}
1067 	xa_unlock_irqrestore(&qib_dev_table, flags);
1068 	return sps_ints;
1069 }
1070 
1071 /*
1072  * Allocate our primary per-unit data structure.  Must be done via verbs
1073  * allocator, because the verbs cleanup process both does cleanup and
1074  * free of the data structure.
1075  * "extra" is for chip-specific data.
1076  */
1077 struct qib_devdata *qib_alloc_devdata(struct pci_dev *pdev, size_t extra)
1078 {
1079 	struct qib_devdata *dd;
1080 	int ret, nports;
1081 
1082 	/* extra is * number of ports */
1083 	nports = extra / sizeof(struct qib_pportdata);
1084 	dd = (struct qib_devdata *)rvt_alloc_device(sizeof(*dd) + extra,
1085 						    nports);
1086 	if (!dd)
1087 		return ERR_PTR(-ENOMEM);
1088 
1089 	ret = xa_alloc_irq(&qib_dev_table, &dd->unit, dd, xa_limit_32b,
1090 			GFP_KERNEL);
1091 	if (ret < 0) {
1092 		qib_early_err(&pdev->dev,
1093 			      "Could not allocate unit ID: error %d\n", -ret);
1094 		goto bail;
1095 	}
1096 	rvt_set_ibdev_name(&dd->verbs_dev.rdi, "%s%d", "qib", dd->unit);
1097 
1098 	dd->int_counter = alloc_percpu(u64);
1099 	if (!dd->int_counter) {
1100 		ret = -ENOMEM;
1101 		qib_early_err(&pdev->dev,
1102 			      "Could not allocate per-cpu int_counter\n");
1103 		goto bail;
1104 	}
1105 
1106 	if (!qib_cpulist_count) {
1107 		u32 count = num_online_cpus();
1108 
1109 		qib_cpulist = kcalloc(BITS_TO_LONGS(count), sizeof(long),
1110 				      GFP_KERNEL);
1111 		if (qib_cpulist)
1112 			qib_cpulist_count = count;
1113 	}
1114 #ifdef CONFIG_DEBUG_FS
1115 	qib_dbg_ibdev_init(&dd->verbs_dev);
1116 #endif
1117 	return dd;
1118 bail:
1119 	if (!list_empty(&dd->list))
1120 		list_del_init(&dd->list);
1121 	rvt_dealloc_device(&dd->verbs_dev.rdi);
1122 	return ERR_PTR(ret);
1123 }
1124 
1125 /*
1126  * Called from freeze mode handlers, and from PCI error
1127  * reporting code.  Should be paranoid about state of
1128  * system and data structures.
1129  */
1130 void qib_disable_after_error(struct qib_devdata *dd)
1131 {
1132 	if (dd->flags & QIB_INITTED) {
1133 		u32 pidx;
1134 
1135 		dd->flags &= ~QIB_INITTED;
1136 		if (dd->pport)
1137 			for (pidx = 0; pidx < dd->num_pports; ++pidx) {
1138 				struct qib_pportdata *ppd;
1139 
1140 				ppd = dd->pport + pidx;
1141 				if (dd->flags & QIB_PRESENT) {
1142 					qib_set_linkstate(ppd,
1143 						QIB_IB_LINKDOWN_DISABLE);
1144 					dd->f_setextled(ppd, 0);
1145 				}
1146 				*ppd->statusp &= ~QIB_STATUS_IB_READY;
1147 			}
1148 	}
1149 
1150 	/*
1151 	 * Mark as having had an error for driver, and also
1152 	 * for /sys and status word mapped to user programs.
1153 	 * This marks unit as not usable, until reset.
1154 	 */
1155 	if (dd->devstatusp)
1156 		*dd->devstatusp |= QIB_STATUS_HWERROR;
1157 }
1158 
1159 static void qib_remove_one(struct pci_dev *);
1160 static int qib_init_one(struct pci_dev *, const struct pci_device_id *);
1161 static void qib_shutdown_one(struct pci_dev *);
1162 
1163 #define DRIVER_LOAD_MSG "Intel " QIB_DRV_NAME " loaded: "
1164 #define PFX QIB_DRV_NAME ": "
1165 
1166 static const struct pci_device_id qib_pci_tbl[] = {
1167 	{ PCI_DEVICE(PCI_VENDOR_ID_PATHSCALE, PCI_DEVICE_ID_QLOGIC_IB_6120) },
1168 	{ PCI_DEVICE(PCI_VENDOR_ID_QLOGIC, PCI_DEVICE_ID_QLOGIC_IB_7220) },
1169 	{ PCI_DEVICE(PCI_VENDOR_ID_QLOGIC, PCI_DEVICE_ID_QLOGIC_IB_7322) },
1170 	{ 0, }
1171 };
1172 
1173 MODULE_DEVICE_TABLE(pci, qib_pci_tbl);
1174 
1175 static struct pci_driver qib_driver = {
1176 	.name = QIB_DRV_NAME,
1177 	.probe = qib_init_one,
1178 	.remove = qib_remove_one,
1179 	.shutdown = qib_shutdown_one,
1180 	.id_table = qib_pci_tbl,
1181 	.err_handler = &qib_pci_err_handler,
1182 };
1183 
1184 #ifdef CONFIG_INFINIBAND_QIB_DCA
1185 
1186 static int qib_notify_dca(struct notifier_block *, unsigned long, void *);
1187 static struct notifier_block dca_notifier = {
1188 	.notifier_call  = qib_notify_dca,
1189 	.next           = NULL,
1190 	.priority       = 0
1191 };
1192 
1193 static int qib_notify_dca_device(struct device *device, void *data)
1194 {
1195 	struct qib_devdata *dd = dev_get_drvdata(device);
1196 	unsigned long event = *(unsigned long *)data;
1197 
1198 	return dd->f_notify_dca(dd, event);
1199 }
1200 
1201 static int qib_notify_dca(struct notifier_block *nb, unsigned long event,
1202 					  void *p)
1203 {
1204 	int rval;
1205 
1206 	rval = driver_for_each_device(&qib_driver.driver, NULL,
1207 				      &event, qib_notify_dca_device);
1208 	return rval ? NOTIFY_BAD : NOTIFY_DONE;
1209 }
1210 
1211 #endif
1212 
1213 /*
1214  * Do all the generic driver unit- and chip-independent memory
1215  * allocation and initialization.
1216  */
1217 static int __init qib_ib_init(void)
1218 {
1219 	int ret;
1220 
1221 	ret = qib_dev_init();
1222 	if (ret)
1223 		goto bail;
1224 
1225 	/*
1226 	 * These must be called before the driver is registered with
1227 	 * the PCI subsystem.
1228 	 */
1229 #ifdef CONFIG_INFINIBAND_QIB_DCA
1230 	dca_register_notify(&dca_notifier);
1231 #endif
1232 #ifdef CONFIG_DEBUG_FS
1233 	qib_dbg_init();
1234 #endif
1235 	ret = pci_register_driver(&qib_driver);
1236 	if (ret < 0) {
1237 		pr_err("Unable to register driver: error %d\n", -ret);
1238 		goto bail_dev;
1239 	}
1240 
1241 	/* not fatal if it doesn't work */
1242 	if (qib_init_qibfs())
1243 		pr_err("Unable to register ipathfs\n");
1244 	goto bail; /* all OK */
1245 
1246 bail_dev:
1247 #ifdef CONFIG_INFINIBAND_QIB_DCA
1248 	dca_unregister_notify(&dca_notifier);
1249 #endif
1250 #ifdef CONFIG_DEBUG_FS
1251 	qib_dbg_exit();
1252 #endif
1253 	qib_dev_cleanup();
1254 bail:
1255 	return ret;
1256 }
1257 
1258 module_init(qib_ib_init);
1259 
1260 /*
1261  * Do the non-unit driver cleanup, memory free, etc. at unload.
1262  */
1263 static void __exit qib_ib_cleanup(void)
1264 {
1265 	int ret;
1266 
1267 	ret = qib_exit_qibfs();
1268 	if (ret)
1269 		pr_err(
1270 			"Unable to cleanup counter filesystem: error %d\n",
1271 			-ret);
1272 
1273 #ifdef CONFIG_INFINIBAND_QIB_DCA
1274 	dca_unregister_notify(&dca_notifier);
1275 #endif
1276 	pci_unregister_driver(&qib_driver);
1277 #ifdef CONFIG_DEBUG_FS
1278 	qib_dbg_exit();
1279 #endif
1280 
1281 	qib_cpulist_count = 0;
1282 	kfree(qib_cpulist);
1283 
1284 	WARN_ON(!xa_empty(&qib_dev_table));
1285 	qib_dev_cleanup();
1286 }
1287 
1288 module_exit(qib_ib_cleanup);
1289 
1290 /* this can only be called after a successful initialization */
1291 static void cleanup_device_data(struct qib_devdata *dd)
1292 {
1293 	int ctxt;
1294 	int pidx;
1295 	struct qib_ctxtdata **tmp;
1296 	unsigned long flags;
1297 
1298 	/* users can't do anything more with chip */
1299 	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
1300 		if (dd->pport[pidx].statusp)
1301 			*dd->pport[pidx].statusp &= ~QIB_STATUS_CHIP_PRESENT;
1302 
1303 		spin_lock(&dd->pport[pidx].cc_shadow_lock);
1304 
1305 		kfree(dd->pport[pidx].congestion_entries);
1306 		dd->pport[pidx].congestion_entries = NULL;
1307 		kfree(dd->pport[pidx].ccti_entries);
1308 		dd->pport[pidx].ccti_entries = NULL;
1309 		kfree(dd->pport[pidx].ccti_entries_shadow);
1310 		dd->pport[pidx].ccti_entries_shadow = NULL;
1311 		kfree(dd->pport[pidx].congestion_entries_shadow);
1312 		dd->pport[pidx].congestion_entries_shadow = NULL;
1313 
1314 		spin_unlock(&dd->pport[pidx].cc_shadow_lock);
1315 	}
1316 
1317 	qib_disable_wc(dd);
1318 
1319 	if (dd->pioavailregs_dma) {
1320 		dma_free_coherent(&dd->pcidev->dev, PAGE_SIZE,
1321 				  (void *) dd->pioavailregs_dma,
1322 				  dd->pioavailregs_phys);
1323 		dd->pioavailregs_dma = NULL;
1324 	}
1325 
1326 	if (dd->pageshadow) {
1327 		struct page **tmpp = dd->pageshadow;
1328 		dma_addr_t *tmpd = dd->physshadow;
1329 		int i;
1330 
1331 		for (ctxt = 0; ctxt < dd->cfgctxts; ctxt++) {
1332 			int ctxt_tidbase = ctxt * dd->rcvtidcnt;
1333 			int maxtid = ctxt_tidbase + dd->rcvtidcnt;
1334 
1335 			for (i = ctxt_tidbase; i < maxtid; i++) {
1336 				if (!tmpp[i])
1337 					continue;
1338 				pci_unmap_page(dd->pcidev, tmpd[i],
1339 					       PAGE_SIZE, PCI_DMA_FROMDEVICE);
1340 				qib_release_user_pages(&tmpp[i], 1);
1341 				tmpp[i] = NULL;
1342 			}
1343 		}
1344 
1345 		dd->pageshadow = NULL;
1346 		vfree(tmpp);
1347 		dd->physshadow = NULL;
1348 		vfree(tmpd);
1349 	}
1350 
1351 	/*
1352 	 * Free any resources still in use (usually just kernel contexts)
1353 	 * at unload; we do for ctxtcnt, because that's what we allocate.
1354 	 * We acquire lock to be really paranoid that rcd isn't being
1355 	 * accessed from some interrupt-related code (that should not happen,
1356 	 * but best to be sure).
1357 	 */
1358 	spin_lock_irqsave(&dd->uctxt_lock, flags);
1359 	tmp = dd->rcd;
1360 	dd->rcd = NULL;
1361 	spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1362 	for (ctxt = 0; tmp && ctxt < dd->ctxtcnt; ctxt++) {
1363 		struct qib_ctxtdata *rcd = tmp[ctxt];
1364 
1365 		tmp[ctxt] = NULL; /* debugging paranoia */
1366 		qib_free_ctxtdata(dd, rcd);
1367 	}
1368 	kfree(tmp);
1369 }
1370 
1371 /*
1372  * Clean up on unit shutdown, or error during unit load after
1373  * successful initialization.
1374  */
1375 static void qib_postinit_cleanup(struct qib_devdata *dd)
1376 {
1377 	/*
1378 	 * Clean up chip-specific stuff.
1379 	 * We check for NULL here, because it's outside
1380 	 * the kregbase check, and we need to call it
1381 	 * after the free_irq.  Thus it's possible that
1382 	 * the function pointers were never initialized.
1383 	 */
1384 	if (dd->f_cleanup)
1385 		dd->f_cleanup(dd);
1386 
1387 	qib_pcie_ddcleanup(dd);
1388 
1389 	cleanup_device_data(dd);
1390 
1391 	qib_free_devdata(dd);
1392 }
1393 
1394 static int qib_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
1395 {
1396 	int ret, j, pidx, initfail;
1397 	struct qib_devdata *dd = NULL;
1398 
1399 	ret = qib_pcie_init(pdev, ent);
1400 	if (ret)
1401 		goto bail;
1402 
1403 	/*
1404 	 * Do device-specific initialiation, function table setup, dd
1405 	 * allocation, etc.
1406 	 */
1407 	switch (ent->device) {
1408 	case PCI_DEVICE_ID_QLOGIC_IB_6120:
1409 #ifdef CONFIG_PCI_MSI
1410 		dd = qib_init_iba6120_funcs(pdev, ent);
1411 #else
1412 		qib_early_err(&pdev->dev,
1413 			"Intel PCIE device 0x%x cannot work if CONFIG_PCI_MSI is not enabled\n",
1414 			ent->device);
1415 		dd = ERR_PTR(-ENODEV);
1416 #endif
1417 		break;
1418 
1419 	case PCI_DEVICE_ID_QLOGIC_IB_7220:
1420 		dd = qib_init_iba7220_funcs(pdev, ent);
1421 		break;
1422 
1423 	case PCI_DEVICE_ID_QLOGIC_IB_7322:
1424 		dd = qib_init_iba7322_funcs(pdev, ent);
1425 		break;
1426 
1427 	default:
1428 		qib_early_err(&pdev->dev,
1429 			"Failing on unknown Intel deviceid 0x%x\n",
1430 			ent->device);
1431 		ret = -ENODEV;
1432 	}
1433 
1434 	if (IS_ERR(dd))
1435 		ret = PTR_ERR(dd);
1436 	if (ret)
1437 		goto bail; /* error already printed */
1438 
1439 	ret = qib_create_workqueues(dd);
1440 	if (ret)
1441 		goto bail;
1442 
1443 	/* do the generic initialization */
1444 	initfail = qib_init(dd, 0);
1445 
1446 	ret = qib_register_ib_device(dd);
1447 
1448 	/*
1449 	 * Now ready for use.  this should be cleared whenever we
1450 	 * detect a reset, or initiate one.  If earlier failure,
1451 	 * we still create devices, so diags, etc. can be used
1452 	 * to determine cause of problem.
1453 	 */
1454 	if (!qib_mini_init && !initfail && !ret)
1455 		dd->flags |= QIB_INITTED;
1456 
1457 	j = qib_device_create(dd);
1458 	if (j)
1459 		qib_dev_err(dd, "Failed to create /dev devices: %d\n", -j);
1460 	j = qibfs_add(dd);
1461 	if (j)
1462 		qib_dev_err(dd, "Failed filesystem setup for counters: %d\n",
1463 			    -j);
1464 
1465 	if (qib_mini_init || initfail || ret) {
1466 		qib_stop_timers(dd);
1467 		flush_workqueue(ib_wq);
1468 		for (pidx = 0; pidx < dd->num_pports; ++pidx)
1469 			dd->f_quiet_serdes(dd->pport + pidx);
1470 		if (qib_mini_init)
1471 			goto bail;
1472 		if (!j) {
1473 			(void) qibfs_remove(dd);
1474 			qib_device_remove(dd);
1475 		}
1476 		if (!ret)
1477 			qib_unregister_ib_device(dd);
1478 		qib_postinit_cleanup(dd);
1479 		if (initfail)
1480 			ret = initfail;
1481 		goto bail;
1482 	}
1483 
1484 	ret = qib_enable_wc(dd);
1485 	if (ret) {
1486 		qib_dev_err(dd,
1487 			"Write combining not enabled (err %d): performance may be poor\n",
1488 			-ret);
1489 		ret = 0;
1490 	}
1491 
1492 	qib_verify_pioperf(dd);
1493 bail:
1494 	return ret;
1495 }
1496 
1497 static void qib_remove_one(struct pci_dev *pdev)
1498 {
1499 	struct qib_devdata *dd = pci_get_drvdata(pdev);
1500 	int ret;
1501 
1502 	/* unregister from IB core */
1503 	qib_unregister_ib_device(dd);
1504 
1505 	/*
1506 	 * Disable the IB link, disable interrupts on the device,
1507 	 * clear dma engines, etc.
1508 	 */
1509 	if (!qib_mini_init)
1510 		qib_shutdown_device(dd);
1511 
1512 	qib_stop_timers(dd);
1513 
1514 	/* wait until all of our (qsfp) queue_work() calls complete */
1515 	flush_workqueue(ib_wq);
1516 
1517 	ret = qibfs_remove(dd);
1518 	if (ret)
1519 		qib_dev_err(dd, "Failed counters filesystem cleanup: %d\n",
1520 			    -ret);
1521 
1522 	qib_device_remove(dd);
1523 
1524 	qib_postinit_cleanup(dd);
1525 }
1526 
1527 static void qib_shutdown_one(struct pci_dev *pdev)
1528 {
1529 	struct qib_devdata *dd = pci_get_drvdata(pdev);
1530 
1531 	qib_shutdown_device(dd);
1532 }
1533 
1534 /**
1535  * qib_create_rcvhdrq - create a receive header queue
1536  * @dd: the qlogic_ib device
1537  * @rcd: the context data
1538  *
1539  * This must be contiguous memory (from an i/o perspective), and must be
1540  * DMA'able (which means for some systems, it will go through an IOMMU,
1541  * or be forced into a low address range).
1542  */
1543 int qib_create_rcvhdrq(struct qib_devdata *dd, struct qib_ctxtdata *rcd)
1544 {
1545 	unsigned amt;
1546 	int old_node_id;
1547 
1548 	if (!rcd->rcvhdrq) {
1549 		dma_addr_t phys_hdrqtail;
1550 		gfp_t gfp_flags;
1551 
1552 		amt = ALIGN(dd->rcvhdrcnt * dd->rcvhdrentsize *
1553 			    sizeof(u32), PAGE_SIZE);
1554 		gfp_flags = (rcd->ctxt >= dd->first_user_ctxt) ?
1555 			GFP_USER : GFP_KERNEL;
1556 
1557 		old_node_id = dev_to_node(&dd->pcidev->dev);
1558 		set_dev_node(&dd->pcidev->dev, rcd->node_id);
1559 		rcd->rcvhdrq = dma_alloc_coherent(
1560 			&dd->pcidev->dev, amt, &rcd->rcvhdrq_phys,
1561 			gfp_flags | __GFP_COMP);
1562 		set_dev_node(&dd->pcidev->dev, old_node_id);
1563 
1564 		if (!rcd->rcvhdrq) {
1565 			qib_dev_err(dd,
1566 				"attempt to allocate %d bytes for ctxt %u rcvhdrq failed\n",
1567 				amt, rcd->ctxt);
1568 			goto bail;
1569 		}
1570 
1571 		if (rcd->ctxt >= dd->first_user_ctxt) {
1572 			rcd->user_event_mask = vmalloc_user(PAGE_SIZE);
1573 			if (!rcd->user_event_mask)
1574 				goto bail_free_hdrq;
1575 		}
1576 
1577 		if (!(dd->flags & QIB_NODMA_RTAIL)) {
1578 			set_dev_node(&dd->pcidev->dev, rcd->node_id);
1579 			rcd->rcvhdrtail_kvaddr = dma_alloc_coherent(
1580 				&dd->pcidev->dev, PAGE_SIZE, &phys_hdrqtail,
1581 				gfp_flags);
1582 			set_dev_node(&dd->pcidev->dev, old_node_id);
1583 			if (!rcd->rcvhdrtail_kvaddr)
1584 				goto bail_free;
1585 			rcd->rcvhdrqtailaddr_phys = phys_hdrqtail;
1586 		}
1587 
1588 		rcd->rcvhdrq_size = amt;
1589 	}
1590 
1591 	/* clear for security and sanity on each use */
1592 	memset(rcd->rcvhdrq, 0, rcd->rcvhdrq_size);
1593 	if (rcd->rcvhdrtail_kvaddr)
1594 		memset(rcd->rcvhdrtail_kvaddr, 0, PAGE_SIZE);
1595 	return 0;
1596 
1597 bail_free:
1598 	qib_dev_err(dd,
1599 		"attempt to allocate 1 page for ctxt %u rcvhdrqtailaddr failed\n",
1600 		rcd->ctxt);
1601 	vfree(rcd->user_event_mask);
1602 	rcd->user_event_mask = NULL;
1603 bail_free_hdrq:
1604 	dma_free_coherent(&dd->pcidev->dev, amt, rcd->rcvhdrq,
1605 			  rcd->rcvhdrq_phys);
1606 	rcd->rcvhdrq = NULL;
1607 bail:
1608 	return -ENOMEM;
1609 }
1610 
1611 /**
1612  * allocate eager buffers, both kernel and user contexts.
1613  * @rcd: the context we are setting up.
1614  *
1615  * Allocate the eager TID buffers and program them into hip.
1616  * They are no longer completely contiguous, we do multiple allocation
1617  * calls.  Otherwise we get the OOM code involved, by asking for too
1618  * much per call, with disastrous results on some kernels.
1619  */
1620 int qib_setup_eagerbufs(struct qib_ctxtdata *rcd)
1621 {
1622 	struct qib_devdata *dd = rcd->dd;
1623 	unsigned e, egrcnt, egrperchunk, chunk, egrsize, egroff;
1624 	size_t size;
1625 	gfp_t gfp_flags;
1626 	int old_node_id;
1627 
1628 	/*
1629 	 * GFP_USER, but without GFP_FS, so buffer cache can be
1630 	 * coalesced (we hope); otherwise, even at order 4,
1631 	 * heavy filesystem activity makes these fail, and we can
1632 	 * use compound pages.
1633 	 */
1634 	gfp_flags = __GFP_RECLAIM | __GFP_IO | __GFP_COMP;
1635 
1636 	egrcnt = rcd->rcvegrcnt;
1637 	egroff = rcd->rcvegr_tid_base;
1638 	egrsize = dd->rcvegrbufsize;
1639 
1640 	chunk = rcd->rcvegrbuf_chunks;
1641 	egrperchunk = rcd->rcvegrbufs_perchunk;
1642 	size = rcd->rcvegrbuf_size;
1643 	if (!rcd->rcvegrbuf) {
1644 		rcd->rcvegrbuf =
1645 			kcalloc_node(chunk, sizeof(rcd->rcvegrbuf[0]),
1646 				     GFP_KERNEL, rcd->node_id);
1647 		if (!rcd->rcvegrbuf)
1648 			goto bail;
1649 	}
1650 	if (!rcd->rcvegrbuf_phys) {
1651 		rcd->rcvegrbuf_phys =
1652 			kmalloc_array_node(chunk,
1653 					   sizeof(rcd->rcvegrbuf_phys[0]),
1654 					   GFP_KERNEL, rcd->node_id);
1655 		if (!rcd->rcvegrbuf_phys)
1656 			goto bail_rcvegrbuf;
1657 	}
1658 	for (e = 0; e < rcd->rcvegrbuf_chunks; e++) {
1659 		if (rcd->rcvegrbuf[e])
1660 			continue;
1661 
1662 		old_node_id = dev_to_node(&dd->pcidev->dev);
1663 		set_dev_node(&dd->pcidev->dev, rcd->node_id);
1664 		rcd->rcvegrbuf[e] =
1665 			dma_alloc_coherent(&dd->pcidev->dev, size,
1666 					   &rcd->rcvegrbuf_phys[e],
1667 					   gfp_flags);
1668 		set_dev_node(&dd->pcidev->dev, old_node_id);
1669 		if (!rcd->rcvegrbuf[e])
1670 			goto bail_rcvegrbuf_phys;
1671 	}
1672 
1673 	rcd->rcvegr_phys = rcd->rcvegrbuf_phys[0];
1674 
1675 	for (e = chunk = 0; chunk < rcd->rcvegrbuf_chunks; chunk++) {
1676 		dma_addr_t pa = rcd->rcvegrbuf_phys[chunk];
1677 		unsigned i;
1678 
1679 		/* clear for security and sanity on each use */
1680 		memset(rcd->rcvegrbuf[chunk], 0, size);
1681 
1682 		for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) {
1683 			dd->f_put_tid(dd, e + egroff +
1684 					  (u64 __iomem *)
1685 					  ((char __iomem *)
1686 					   dd->kregbase +
1687 					   dd->rcvegrbase),
1688 					  RCVHQ_RCV_TYPE_EAGER, pa);
1689 			pa += egrsize;
1690 		}
1691 		cond_resched(); /* don't hog the cpu */
1692 	}
1693 
1694 	return 0;
1695 
1696 bail_rcvegrbuf_phys:
1697 	for (e = 0; e < rcd->rcvegrbuf_chunks && rcd->rcvegrbuf[e]; e++)
1698 		dma_free_coherent(&dd->pcidev->dev, size,
1699 				  rcd->rcvegrbuf[e], rcd->rcvegrbuf_phys[e]);
1700 	kfree(rcd->rcvegrbuf_phys);
1701 	rcd->rcvegrbuf_phys = NULL;
1702 bail_rcvegrbuf:
1703 	kfree(rcd->rcvegrbuf);
1704 	rcd->rcvegrbuf = NULL;
1705 bail:
1706 	return -ENOMEM;
1707 }
1708 
1709 /*
1710  * Note: Changes to this routine should be mirrored
1711  * for the diagnostics routine qib_remap_ioaddr32().
1712  * There is also related code for VL15 buffers in qib_init_7322_variables().
1713  * The teardown code that unmaps is in qib_pcie_ddcleanup()
1714  */
1715 int init_chip_wc_pat(struct qib_devdata *dd, u32 vl15buflen)
1716 {
1717 	u64 __iomem *qib_kregbase = NULL;
1718 	void __iomem *qib_piobase = NULL;
1719 	u64 __iomem *qib_userbase = NULL;
1720 	u64 qib_kreglen;
1721 	u64 qib_pio2koffset = dd->piobufbase & 0xffffffff;
1722 	u64 qib_pio4koffset = dd->piobufbase >> 32;
1723 	u64 qib_pio2klen = dd->piobcnt2k * dd->palign;
1724 	u64 qib_pio4klen = dd->piobcnt4k * dd->align4k;
1725 	u64 qib_physaddr = dd->physaddr;
1726 	u64 qib_piolen;
1727 	u64 qib_userlen = 0;
1728 
1729 	/*
1730 	 * Free the old mapping because the kernel will try to reuse the
1731 	 * old mapping and not create a new mapping with the
1732 	 * write combining attribute.
1733 	 */
1734 	iounmap(dd->kregbase);
1735 	dd->kregbase = NULL;
1736 
1737 	/*
1738 	 * Assumes chip address space looks like:
1739 	 *	- kregs + sregs + cregs + uregs (in any order)
1740 	 *	- piobufs (2K and 4K bufs in either order)
1741 	 * or:
1742 	 *	- kregs + sregs + cregs (in any order)
1743 	 *	- piobufs (2K and 4K bufs in either order)
1744 	 *	- uregs
1745 	 */
1746 	if (dd->piobcnt4k == 0) {
1747 		qib_kreglen = qib_pio2koffset;
1748 		qib_piolen = qib_pio2klen;
1749 	} else if (qib_pio2koffset < qib_pio4koffset) {
1750 		qib_kreglen = qib_pio2koffset;
1751 		qib_piolen = qib_pio4koffset + qib_pio4klen - qib_kreglen;
1752 	} else {
1753 		qib_kreglen = qib_pio4koffset;
1754 		qib_piolen = qib_pio2koffset + qib_pio2klen - qib_kreglen;
1755 	}
1756 	qib_piolen += vl15buflen;
1757 	/* Map just the configured ports (not all hw ports) */
1758 	if (dd->uregbase > qib_kreglen)
1759 		qib_userlen = dd->ureg_align * dd->cfgctxts;
1760 
1761 	/* Sanity checks passed, now create the new mappings */
1762 	qib_kregbase = ioremap(qib_physaddr, qib_kreglen);
1763 	if (!qib_kregbase)
1764 		goto bail;
1765 
1766 	qib_piobase = ioremap_wc(qib_physaddr + qib_kreglen, qib_piolen);
1767 	if (!qib_piobase)
1768 		goto bail_kregbase;
1769 
1770 	if (qib_userlen) {
1771 		qib_userbase = ioremap(qib_physaddr + dd->uregbase,
1772 					       qib_userlen);
1773 		if (!qib_userbase)
1774 			goto bail_piobase;
1775 	}
1776 
1777 	dd->kregbase = qib_kregbase;
1778 	dd->kregend = (u64 __iomem *)
1779 		((char __iomem *) qib_kregbase + qib_kreglen);
1780 	dd->piobase = qib_piobase;
1781 	dd->pio2kbase = (void __iomem *)
1782 		(((char __iomem *) dd->piobase) +
1783 		 qib_pio2koffset - qib_kreglen);
1784 	if (dd->piobcnt4k)
1785 		dd->pio4kbase = (void __iomem *)
1786 			(((char __iomem *) dd->piobase) +
1787 			 qib_pio4koffset - qib_kreglen);
1788 	if (qib_userlen)
1789 		/* ureg will now be accessed relative to dd->userbase */
1790 		dd->userbase = qib_userbase;
1791 	return 0;
1792 
1793 bail_piobase:
1794 	iounmap(qib_piobase);
1795 bail_kregbase:
1796 	iounmap(qib_kregbase);
1797 bail:
1798 	return -ENOMEM;
1799 }
1800