xref: /openbmc/qemu/hw/scsi/spapr_vscsi.c (revision 0c0c1fd9)
1 /*
2  * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
3  *
4  * PAPR Virtual SCSI, aka ibmvscsi
5  *
6  * Copyright (c) 2010,2011 Benjamin Herrenschmidt, IBM Corporation.
7  *
8  * Permission is hereby granted, free of charge, to any person obtaining a copy
9  * of this software and associated documentation files (the "Software"), to deal
10  * in the Software without restriction, including without limitation the rights
11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12  * copies of the Software, and to permit persons to whom the Software is
13  * furnished to do so, subject to the following conditions:
14  *
15  * The above copyright notice and this permission notice shall be included in
16  * all copies or substantial portions of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24  * THE SOFTWARE.
25  *
26  * TODO:
27  *
28  *  - Cleanups :-)
29  *  - Sort out better how to assign devices to VSCSI instances
30  *  - Fix residual counts
31  *  - Add indirect descriptors support
32  *  - Maybe do autosense (PAPR seems to mandate it, linux doesn't care)
33  */
34 #include "qemu/osdep.h"
35 #include "qemu-common.h"
36 #include "cpu.h"
37 #include "hw/hw.h"
38 #include "hw/scsi/scsi.h"
39 #include "block/scsi.h"
40 #include "srp.h"
41 #include "hw/qdev.h"
42 #include "hw/ppc/spapr.h"
43 #include "hw/ppc/spapr_vio.h"
44 #include "viosrp.h"
45 
46 #include <libfdt.h>
47 
48 /*#define DEBUG_VSCSI*/
49 
50 #ifdef DEBUG_VSCSI
51 #define DPRINTF(fmt, ...) \
52     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
53 #else
54 #define DPRINTF(fmt, ...) \
55     do { } while (0)
56 #endif
57 
58 /*
59  * Virtual SCSI device
60  */
61 
62 /* Random numbers */
63 #define VSCSI_MAX_SECTORS       4096
64 #define VSCSI_REQ_LIMIT         24
65 
66 #define SRP_RSP_SENSE_DATA_LEN  18
67 
68 #define SRP_REPORT_LUNS_WLUN    0xc10100000000000ULL
69 
70 typedef union vscsi_crq {
71     struct viosrp_crq s;
72     uint8_t raw[16];
73 } vscsi_crq;
74 
75 typedef struct vscsi_req {
76     vscsi_crq               crq;
77     union viosrp_iu         iu;
78 
79     /* SCSI request tracking */
80     SCSIRequest             *sreq;
81     uint32_t                qtag; /* qemu tag != srp tag */
82     bool                    active;
83     bool                    writing;
84     bool                    dma_error;
85     uint32_t                data_len;
86     uint32_t                senselen;
87     uint8_t                 sense[SCSI_SENSE_BUF_SIZE];
88 
89     /* RDMA related bits */
90     uint8_t                 dma_fmt;
91     uint16_t                local_desc;
92     uint16_t                total_desc;
93     uint16_t                cdb_offset;
94     uint16_t                cur_desc_num;
95     uint16_t                cur_desc_offset;
96 } vscsi_req;
97 
98 #define TYPE_VIO_SPAPR_VSCSI_DEVICE "spapr-vscsi"
99 #define VIO_SPAPR_VSCSI_DEVICE(obj) \
100      OBJECT_CHECK(VSCSIState, (obj), TYPE_VIO_SPAPR_VSCSI_DEVICE)
101 
102 typedef struct {
103     VIOsPAPRDevice vdev;
104     SCSIBus bus;
105     vscsi_req reqs[VSCSI_REQ_LIMIT];
106 } VSCSIState;
107 
108 static struct vscsi_req *vscsi_get_req(VSCSIState *s)
109 {
110     vscsi_req *req;
111     int i;
112 
113     for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
114         req = &s->reqs[i];
115         if (!req->active) {
116             memset(req, 0, sizeof(*req));
117             req->qtag = i;
118             req->active = 1;
119             return req;
120         }
121     }
122     return NULL;
123 }
124 
125 static struct vscsi_req *vscsi_find_req(VSCSIState *s, uint64_t srp_tag)
126 {
127     vscsi_req *req;
128     int i;
129 
130     for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
131         req = &s->reqs[i];
132         if (req->iu.srp.cmd.tag == srp_tag) {
133             return req;
134         }
135     }
136     return NULL;
137 }
138 
139 static void vscsi_put_req(vscsi_req *req)
140 {
141     if (req->sreq != NULL) {
142         scsi_req_unref(req->sreq);
143     }
144     req->sreq = NULL;
145     req->active = 0;
146 }
147 
148 static SCSIDevice *vscsi_device_find(SCSIBus *bus, uint64_t srp_lun, int *lun)
149 {
150     int channel = 0, id = 0;
151 
152 retry:
153     switch (srp_lun >> 62) {
154     case 0:
155         if ((srp_lun >> 56) != 0) {
156             channel = (srp_lun >> 56) & 0x3f;
157             id = (srp_lun >> 48) & 0xff;
158             srp_lun <<= 16;
159             goto retry;
160         }
161         *lun = (srp_lun >> 48) & 0xff;
162         break;
163 
164     case 1:
165         *lun = (srp_lun >> 48) & 0x3fff;
166         break;
167     case 2:
168         channel = (srp_lun >> 53) & 0x7;
169         id = (srp_lun >> 56) & 0x3f;
170         *lun = (srp_lun >> 48) & 0x1f;
171         break;
172     case 3:
173         *lun = -1;
174         return NULL;
175     default:
176         abort();
177     }
178 
179     return scsi_device_find(bus, channel, id, *lun);
180 }
181 
182 static int vscsi_send_iu(VSCSIState *s, vscsi_req *req,
183                          uint64_t length, uint8_t format)
184 {
185     long rc, rc1;
186 
187     /* First copy the SRP */
188     rc = spapr_vio_dma_write(&s->vdev, req->crq.s.IU_data_ptr,
189                              &req->iu, length);
190     if (rc) {
191         fprintf(stderr, "vscsi_send_iu: DMA write failure !\n");
192     }
193 
194     req->crq.s.valid = 0x80;
195     req->crq.s.format = format;
196     req->crq.s.reserved = 0x00;
197     req->crq.s.timeout = cpu_to_be16(0x0000);
198     req->crq.s.IU_length = cpu_to_be16(length);
199     req->crq.s.IU_data_ptr = req->iu.srp.rsp.tag; /* right byte order */
200 
201     if (rc == 0) {
202         req->crq.s.status = VIOSRP_OK;
203     } else {
204         req->crq.s.status = VIOSRP_ADAPTER_FAIL;
205     }
206 
207     rc1 = spapr_vio_send_crq(&s->vdev, req->crq.raw);
208     if (rc1) {
209         fprintf(stderr, "vscsi_send_iu: Error sending response\n");
210         return rc1;
211     }
212 
213     return rc;
214 }
215 
216 static void vscsi_makeup_sense(VSCSIState *s, vscsi_req *req,
217                                uint8_t key, uint8_t asc, uint8_t ascq)
218 {
219     req->senselen = SRP_RSP_SENSE_DATA_LEN;
220 
221     /* Valid bit and 'current errors' */
222     req->sense[0] = (0x1 << 7 | 0x70);
223     /* Sense key */
224     req->sense[2] = key;
225     /* Additional sense length */
226     req->sense[7] = 0xa; /* 10 bytes */
227     /* Additional sense code */
228     req->sense[12] = asc;
229     req->sense[13] = ascq;
230 }
231 
232 static int vscsi_send_rsp(VSCSIState *s, vscsi_req *req,
233                           uint8_t status, int32_t res_in, int32_t res_out)
234 {
235     union viosrp_iu *iu = &req->iu;
236     uint64_t tag = iu->srp.rsp.tag;
237     int total_len = sizeof(iu->srp.rsp);
238     uint8_t sol_not = iu->srp.cmd.sol_not;
239 
240     DPRINTF("VSCSI: Sending resp status: 0x%x, "
241             "res_in: %d, res_out: %d\n", status, res_in, res_out);
242 
243     memset(iu, 0, sizeof(struct srp_rsp));
244     iu->srp.rsp.opcode = SRP_RSP;
245     iu->srp.rsp.req_lim_delta = cpu_to_be32(1);
246     iu->srp.rsp.tag = tag;
247 
248     /* Handle residuals */
249     if (res_in < 0) {
250         iu->srp.rsp.flags |= SRP_RSP_FLAG_DIUNDER;
251         res_in = -res_in;
252     } else if (res_in) {
253         iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER;
254     }
255     if (res_out < 0) {
256         iu->srp.rsp.flags |= SRP_RSP_FLAG_DOUNDER;
257         res_out = -res_out;
258     } else if (res_out) {
259         iu->srp.rsp.flags |= SRP_RSP_FLAG_DOOVER;
260     }
261     iu->srp.rsp.data_in_res_cnt = cpu_to_be32(res_in);
262     iu->srp.rsp.data_out_res_cnt = cpu_to_be32(res_out);
263 
264     /* We don't do response data */
265     /* iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID; */
266     iu->srp.rsp.resp_data_len = cpu_to_be32(0);
267 
268     /* Handle success vs. failure */
269     iu->srp.rsp.status = status;
270     if (status) {
271         iu->srp.rsp.sol_not = (sol_not & 0x04) >> 2;
272         if (req->senselen) {
273             req->iu.srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
274             req->iu.srp.rsp.sense_data_len = cpu_to_be32(req->senselen);
275             memcpy(req->iu.srp.rsp.data, req->sense, req->senselen);
276             total_len += req->senselen;
277         }
278     } else {
279         iu->srp.rsp.sol_not = (sol_not & 0x02) >> 1;
280     }
281 
282     vscsi_send_iu(s, req, total_len, VIOSRP_SRP_FORMAT);
283     return 0;
284 }
285 
286 static inline struct srp_direct_buf vscsi_swap_desc(struct srp_direct_buf desc)
287 {
288     desc.va = be64_to_cpu(desc.va);
289     desc.len = be32_to_cpu(desc.len);
290     return desc;
291 }
292 
293 static int vscsi_fetch_desc(VSCSIState *s, struct vscsi_req *req,
294                             unsigned n, unsigned buf_offset,
295                             struct srp_direct_buf *ret)
296 {
297     struct srp_cmd *cmd = &req->iu.srp.cmd;
298 
299     switch (req->dma_fmt) {
300     case SRP_NO_DATA_DESC: {
301         DPRINTF("VSCSI: no data descriptor\n");
302         return 0;
303     }
304     case SRP_DATA_DESC_DIRECT: {
305         memcpy(ret, cmd->add_data + req->cdb_offset, sizeof(*ret));
306         assert(req->cur_desc_num == 0);
307         DPRINTF("VSCSI: direct segment\n");
308         break;
309     }
310     case SRP_DATA_DESC_INDIRECT: {
311         struct srp_indirect_buf *tmp = (struct srp_indirect_buf *)
312                                        (cmd->add_data + req->cdb_offset);
313         if (n < req->local_desc) {
314             *ret = tmp->desc_list[n];
315             DPRINTF("VSCSI: indirect segment local tag=0x%x desc#%d/%d\n",
316                     req->qtag, n, req->local_desc);
317 
318         } else if (n < req->total_desc) {
319             int rc;
320             struct srp_direct_buf tbl_desc = vscsi_swap_desc(tmp->table_desc);
321             unsigned desc_offset = n * sizeof(struct srp_direct_buf);
322 
323             if (desc_offset >= tbl_desc.len) {
324                 DPRINTF("VSCSI:   #%d is ouf of range (%d bytes)\n",
325                         n, desc_offset);
326                 return -1;
327             }
328             rc = spapr_vio_dma_read(&s->vdev, tbl_desc.va + desc_offset,
329                                     ret, sizeof(struct srp_direct_buf));
330             if (rc) {
331                 DPRINTF("VSCSI: spapr_vio_dma_read -> %d reading ext_desc\n",
332                         rc);
333                 return -1;
334             }
335             DPRINTF("VSCSI: indirect segment ext. tag=0x%x desc#%d/%d { va=%"PRIx64" len=%x }\n",
336                     req->qtag, n, req->total_desc, tbl_desc.va, tbl_desc.len);
337         } else {
338             DPRINTF("VSCSI:   Out of descriptors !\n");
339             return 0;
340         }
341         break;
342     }
343     default:
344         fprintf(stderr, "VSCSI:   Unknown format %x\n", req->dma_fmt);
345         return -1;
346     }
347 
348     *ret = vscsi_swap_desc(*ret);
349     if (buf_offset > ret->len) {
350         DPRINTF("   offset=%x is out of a descriptor #%d boundary=%x\n",
351                 buf_offset, req->cur_desc_num, ret->len);
352         return -1;
353     }
354     ret->va += buf_offset;
355     ret->len -= buf_offset;
356 
357     DPRINTF("   cur=%d offs=%x ret { va=%"PRIx64" len=%x }\n",
358             req->cur_desc_num, req->cur_desc_offset, ret->va, ret->len);
359 
360     return ret->len ? 1 : 0;
361 }
362 
363 static int vscsi_srp_direct_data(VSCSIState *s, vscsi_req *req,
364                                  uint8_t *buf, uint32_t len)
365 {
366     struct srp_direct_buf md;
367     uint32_t llen;
368     int rc = 0;
369 
370     rc = vscsi_fetch_desc(s, req, req->cur_desc_num, req->cur_desc_offset, &md);
371     if (rc < 0) {
372         return -1;
373     } else if (rc == 0) {
374         return 0;
375     }
376 
377     llen = MIN(len, md.len);
378     if (llen) {
379         if (req->writing) { /* writing = to device = reading from memory */
380             rc = spapr_vio_dma_read(&s->vdev, md.va, buf, llen);
381         } else {
382             rc = spapr_vio_dma_write(&s->vdev, md.va, buf, llen);
383         }
384     }
385 
386     if (rc) {
387         return -1;
388     }
389     req->cur_desc_offset += llen;
390 
391     return llen;
392 }
393 
394 static int vscsi_srp_indirect_data(VSCSIState *s, vscsi_req *req,
395                                    uint8_t *buf, uint32_t len)
396 {
397     struct srp_direct_buf md;
398     int rc = 0;
399     uint32_t llen, total = 0;
400 
401     DPRINTF("VSCSI: indirect segment 0x%x bytes\n", len);
402 
403     /* While we have data ... */
404     while (len) {
405         rc = vscsi_fetch_desc(s, req, req->cur_desc_num, req->cur_desc_offset, &md);
406         if (rc < 0) {
407             return -1;
408         } else if (rc == 0) {
409             break;
410         }
411 
412         /* Perform transfer */
413         llen = MIN(len, md.len);
414         if (req->writing) { /* writing = to device = reading from memory */
415             rc = spapr_vio_dma_read(&s->vdev, md.va, buf, llen);
416         } else {
417             rc = spapr_vio_dma_write(&s->vdev, md.va, buf, llen);
418         }
419         if (rc) {
420             DPRINTF("VSCSI: spapr_vio_dma_r/w(%d) -> %d\n", req->writing, rc);
421             break;
422         }
423         DPRINTF("VSCSI:     data: %02x %02x %02x %02x...\n",
424                 buf[0], buf[1], buf[2], buf[3]);
425 
426         len -= llen;
427         buf += llen;
428 
429         total += llen;
430 
431         /* Update current position in the current descriptor */
432         req->cur_desc_offset += llen;
433         if (md.len == llen) {
434             /* Go to the next descriptor if the current one finished */
435             ++req->cur_desc_num;
436             req->cur_desc_offset = 0;
437         }
438     }
439 
440     return rc ? -1 : total;
441 }
442 
443 static int vscsi_srp_transfer_data(VSCSIState *s, vscsi_req *req,
444                                    int writing, uint8_t *buf, uint32_t len)
445 {
446     int err = 0;
447 
448     switch (req->dma_fmt) {
449     case SRP_NO_DATA_DESC:
450         DPRINTF("VSCSI: no data desc transfer, skipping 0x%x bytes\n", len);
451         break;
452     case SRP_DATA_DESC_DIRECT:
453         err = vscsi_srp_direct_data(s, req, buf, len);
454         break;
455     case SRP_DATA_DESC_INDIRECT:
456         err = vscsi_srp_indirect_data(s, req, buf, len);
457         break;
458     }
459     return err;
460 }
461 
462 /* Bits from linux srp */
463 static int data_out_desc_size(struct srp_cmd *cmd)
464 {
465     int size = 0;
466     uint8_t fmt = cmd->buf_fmt >> 4;
467 
468     switch (fmt) {
469     case SRP_NO_DATA_DESC:
470         break;
471     case SRP_DATA_DESC_DIRECT:
472         size = sizeof(struct srp_direct_buf);
473         break;
474     case SRP_DATA_DESC_INDIRECT:
475         size = sizeof(struct srp_indirect_buf) +
476             sizeof(struct srp_direct_buf)*cmd->data_out_desc_cnt;
477         break;
478     default:
479         break;
480     }
481     return size;
482 }
483 
484 static int vscsi_preprocess_desc(vscsi_req *req)
485 {
486     struct srp_cmd *cmd = &req->iu.srp.cmd;
487 
488     req->cdb_offset = cmd->add_cdb_len & ~3;
489 
490     if (req->writing) {
491         req->dma_fmt = cmd->buf_fmt >> 4;
492     } else {
493         req->cdb_offset += data_out_desc_size(cmd);
494         req->dma_fmt = cmd->buf_fmt & ((1U << 4) - 1);
495     }
496 
497     switch (req->dma_fmt) {
498     case SRP_NO_DATA_DESC:
499         break;
500     case SRP_DATA_DESC_DIRECT:
501         req->total_desc = req->local_desc = 1;
502         break;
503     case SRP_DATA_DESC_INDIRECT: {
504         struct srp_indirect_buf *ind_tmp = (struct srp_indirect_buf *)
505                 (cmd->add_data + req->cdb_offset);
506 
507         req->total_desc = be32_to_cpu(ind_tmp->table_desc.len) /
508                           sizeof(struct srp_direct_buf);
509         req->local_desc = req->writing ? cmd->data_out_desc_cnt :
510                           cmd->data_in_desc_cnt;
511         break;
512     }
513     default:
514         fprintf(stderr,
515                 "vscsi_preprocess_desc: Unknown format %x\n", req->dma_fmt);
516         return -1;
517     }
518 
519     return 0;
520 }
521 
522 /* Callback to indicate that the SCSI layer has completed a transfer.  */
523 static void vscsi_transfer_data(SCSIRequest *sreq, uint32_t len)
524 {
525     VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(sreq->bus->qbus.parent);
526     vscsi_req *req = sreq->hba_private;
527     uint8_t *buf;
528     int rc = 0;
529 
530     DPRINTF("VSCSI: SCSI xfer complete tag=0x%x len=0x%x, req=%p\n",
531             sreq->tag, len, req);
532     if (req == NULL) {
533         fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
534         return;
535     }
536 
537     if (len) {
538         buf = scsi_req_get_buf(sreq);
539         rc = vscsi_srp_transfer_data(s, req, req->writing, buf, len);
540     }
541     if (rc < 0) {
542         fprintf(stderr, "VSCSI: RDMA error rc=%d!\n", rc);
543         req->dma_error = true;
544         scsi_req_cancel(req->sreq);
545         return;
546     }
547 
548     /* Start next chunk */
549     req->data_len -= rc;
550     scsi_req_continue(sreq);
551 }
552 
553 /* Callback to indicate that the SCSI layer has completed a transfer.  */
554 static void vscsi_command_complete(SCSIRequest *sreq, uint32_t status, size_t resid)
555 {
556     VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(sreq->bus->qbus.parent);
557     vscsi_req *req = sreq->hba_private;
558     int32_t res_in = 0, res_out = 0;
559 
560     DPRINTF("VSCSI: SCSI cmd complete, tag=0x%x status=0x%x, req=%p\n",
561             sreq->tag, status, req);
562     if (req == NULL) {
563         fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
564         return;
565     }
566 
567     if (status == CHECK_CONDITION) {
568         req->senselen = scsi_req_get_sense(req->sreq, req->sense,
569                                            sizeof(req->sense));
570         DPRINTF("VSCSI: Sense data, %d bytes:\n", req->senselen);
571         DPRINTF("       %02x  %02x  %02x  %02x  %02x  %02x  %02x  %02x\n",
572                 req->sense[0], req->sense[1], req->sense[2], req->sense[3],
573                 req->sense[4], req->sense[5], req->sense[6], req->sense[7]);
574         DPRINTF("       %02x  %02x  %02x  %02x  %02x  %02x  %02x  %02x\n",
575                 req->sense[8], req->sense[9], req->sense[10], req->sense[11],
576                 req->sense[12], req->sense[13], req->sense[14], req->sense[15]);
577     }
578 
579     DPRINTF("VSCSI: Command complete err=%d\n", status);
580     if (status == 0) {
581         /* We handle overflows, not underflows for normal commands,
582          * but hopefully nobody cares
583          */
584         if (req->writing) {
585             res_out = req->data_len;
586         } else {
587             res_in = req->data_len;
588         }
589     }
590     vscsi_send_rsp(s, req, status, res_in, res_out);
591     vscsi_put_req(req);
592 }
593 
594 static void vscsi_request_cancelled(SCSIRequest *sreq)
595 {
596     vscsi_req *req = sreq->hba_private;
597 
598     if (req->dma_error) {
599         VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(sreq->bus->qbus.parent);
600 
601         vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
602         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
603     }
604     vscsi_put_req(req);
605 }
606 
607 static const VMStateDescription vmstate_spapr_vscsi_req = {
608     .name = "spapr_vscsi_req",
609     .version_id = 1,
610     .minimum_version_id = 1,
611     .fields = (VMStateField[]) {
612         VMSTATE_BUFFER(crq.raw, vscsi_req),
613         VMSTATE_BUFFER(iu.srp.reserved, vscsi_req),
614         VMSTATE_UINT32(qtag, vscsi_req),
615         VMSTATE_BOOL(active, vscsi_req),
616         VMSTATE_UINT32(data_len, vscsi_req),
617         VMSTATE_BOOL(writing, vscsi_req),
618         VMSTATE_UINT32(senselen, vscsi_req),
619         VMSTATE_BUFFER(sense, vscsi_req),
620         VMSTATE_UINT8(dma_fmt, vscsi_req),
621         VMSTATE_UINT16(local_desc, vscsi_req),
622         VMSTATE_UINT16(total_desc, vscsi_req),
623         VMSTATE_UINT16(cdb_offset, vscsi_req),
624       /*Restart SCSI request from the beginning for now */
625       /*VMSTATE_UINT16(cur_desc_num, vscsi_req),
626         VMSTATE_UINT16(cur_desc_offset, vscsi_req),*/
627         VMSTATE_END_OF_LIST()
628     },
629 };
630 
631 static void vscsi_save_request(QEMUFile *f, SCSIRequest *sreq)
632 {
633     vscsi_req *req = sreq->hba_private;
634     assert(req->active);
635 
636     vmstate_save_state(f, &vmstate_spapr_vscsi_req, req, NULL);
637 
638     DPRINTF("VSCSI: saving tag=%u, current desc#%d, offset=%x\n",
639             req->qtag, req->cur_desc_num, req->cur_desc_offset);
640 }
641 
642 static void *vscsi_load_request(QEMUFile *f, SCSIRequest *sreq)
643 {
644     SCSIBus *bus = sreq->bus;
645     VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(bus->qbus.parent);
646     vscsi_req *req;
647     int rc;
648 
649     assert(sreq->tag < VSCSI_REQ_LIMIT);
650     req = &s->reqs[sreq->tag];
651     assert(!req->active);
652 
653     memset(req, 0, sizeof(*req));
654     rc = vmstate_load_state(f, &vmstate_spapr_vscsi_req, req, 1);
655     if (rc) {
656         fprintf(stderr, "VSCSI: failed loading request tag#%u\n", sreq->tag);
657         return NULL;
658     }
659     assert(req->active);
660 
661     req->sreq = scsi_req_ref(sreq);
662 
663     DPRINTF("VSCSI: restoring tag=%u, current desc#%d, offset=%x\n",
664             req->qtag, req->cur_desc_num, req->cur_desc_offset);
665 
666     return req;
667 }
668 
669 static void vscsi_process_login(VSCSIState *s, vscsi_req *req)
670 {
671     union viosrp_iu *iu = &req->iu;
672     struct srp_login_rsp *rsp = &iu->srp.login_rsp;
673     uint64_t tag = iu->srp.rsp.tag;
674 
675     DPRINTF("VSCSI: Got login, sendin response !\n");
676 
677     /* TODO handle case that requested size is wrong and
678      * buffer format is wrong
679      */
680     memset(iu, 0, sizeof(struct srp_login_rsp));
681     rsp->opcode = SRP_LOGIN_RSP;
682     /* Don't advertise quite as many request as we support to
683      * keep room for management stuff etc...
684      */
685     rsp->req_lim_delta = cpu_to_be32(VSCSI_REQ_LIMIT-2);
686     rsp->tag = tag;
687     rsp->max_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
688     rsp->max_ti_iu_len = cpu_to_be32(sizeof(union srp_iu));
689     /* direct and indirect */
690     rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT);
691 
692     vscsi_send_iu(s, req, sizeof(*rsp), VIOSRP_SRP_FORMAT);
693 }
694 
695 static void vscsi_inquiry_no_target(VSCSIState *s, vscsi_req *req)
696 {
697     uint8_t *cdb = req->iu.srp.cmd.cdb;
698     uint8_t resp_data[36];
699     int rc, len, alen;
700 
701     /* We don't do EVPD. Also check that page_code is 0 */
702     if ((cdb[1] & 0x01) || cdb[2] != 0) {
703         /* Send INVALID FIELD IN CDB */
704         vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0);
705         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
706         return;
707     }
708     alen = cdb[3];
709     alen = (alen << 8) | cdb[4];
710     len = MIN(alen, 36);
711 
712     /* Fake up inquiry using PQ=3 */
713     memset(resp_data, 0, 36);
714     resp_data[0] = 0x7f;   /* Not capable of supporting a device here */
715     resp_data[2] = 0x06;   /* SPS-4 */
716     resp_data[3] = 0x02;   /* Resp data format */
717     resp_data[4] = 36 - 5; /* Additional length */
718     resp_data[7] = 0x10;   /* Sync transfers */
719     memcpy(&resp_data[16], "QEMU EMPTY      ", 16);
720     memcpy(&resp_data[8], "QEMU    ", 8);
721 
722     req->writing = 0;
723     vscsi_preprocess_desc(req);
724     rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len);
725     if (rc < 0) {
726         vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
727         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
728     } else {
729         vscsi_send_rsp(s, req, 0, 36 - rc, 0);
730     }
731 }
732 
733 static void vscsi_report_luns(VSCSIState *s, vscsi_req *req)
734 {
735     BusChild *kid;
736     int i, len, n, rc;
737     uint8_t *resp_data;
738     bool found_lun0;
739 
740     n = 0;
741     found_lun0 = false;
742     QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
743         SCSIDevice *dev = SCSI_DEVICE(kid->child);
744 
745         n += 8;
746         if (dev->channel == 0 && dev->id == 0 && dev->lun == 0) {
747             found_lun0 = true;
748         }
749     }
750     if (!found_lun0) {
751         n += 8;
752     }
753     len = n+8;
754 
755     resp_data = g_malloc0(len);
756     stl_be_p(resp_data, n);
757     i = found_lun0 ? 8 : 16;
758     QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
759         DeviceState *qdev = kid->child;
760         SCSIDevice *dev = SCSI_DEVICE(qdev);
761 
762         if (dev->id == 0 && dev->channel == 0) {
763             resp_data[i] = 0;         /* Use simple LUN for 0 (SAM5 4.7.7.1) */
764         } else {
765             resp_data[i] = (2 << 6);  /* Otherwise LUN addressing (4.7.7.4)  */
766         }
767         resp_data[i] |= dev->id;
768         resp_data[i+1] = (dev->channel << 5);
769         resp_data[i+1] |= dev->lun;
770         i += 8;
771     }
772 
773     vscsi_preprocess_desc(req);
774     rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len);
775     g_free(resp_data);
776     if (rc < 0) {
777         vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
778         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
779     } else {
780         vscsi_send_rsp(s, req, 0, len - rc, 0);
781     }
782 }
783 
784 static int vscsi_queue_cmd(VSCSIState *s, vscsi_req *req)
785 {
786     union srp_iu *srp = &req->iu.srp;
787     SCSIDevice *sdev;
788     int n, lun;
789 
790     if ((srp->cmd.lun == 0 || be64_to_cpu(srp->cmd.lun) == SRP_REPORT_LUNS_WLUN)
791       && srp->cmd.cdb[0] == REPORT_LUNS) {
792         vscsi_report_luns(s, req);
793         return 0;
794     }
795 
796     sdev = vscsi_device_find(&s->bus, be64_to_cpu(srp->cmd.lun), &lun);
797     if (!sdev) {
798         DPRINTF("VSCSI: Command for lun %08" PRIx64 " with no drive\n",
799                 be64_to_cpu(srp->cmd.lun));
800         if (srp->cmd.cdb[0] == INQUIRY) {
801             vscsi_inquiry_no_target(s, req);
802         } else {
803             vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0x00);
804             vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
805         } return 1;
806     }
807 
808     req->sreq = scsi_req_new(sdev, req->qtag, lun, srp->cmd.cdb, req);
809     n = scsi_req_enqueue(req->sreq);
810 
811     DPRINTF("VSCSI: Queued command tag 0x%x CMD 0x%x=%s LUN %d ret: %d\n",
812             req->qtag, srp->cmd.cdb[0], scsi_command_name(srp->cmd.cdb[0]),
813             lun, n);
814 
815     if (n) {
816         /* Transfer direction must be set before preprocessing the
817          * descriptors
818          */
819         req->writing = (n < 1);
820 
821         /* Preprocess RDMA descriptors */
822         vscsi_preprocess_desc(req);
823 
824         /* Get transfer direction and initiate transfer */
825         if (n > 0) {
826             req->data_len = n;
827         } else if (n < 0) {
828             req->data_len = -n;
829         }
830         scsi_req_continue(req->sreq);
831     }
832     /* Don't touch req here, it may have been recycled already */
833 
834     return 0;
835 }
836 
837 static int vscsi_process_tsk_mgmt(VSCSIState *s, vscsi_req *req)
838 {
839     union viosrp_iu *iu = &req->iu;
840     vscsi_req *tmpreq;
841     int i, lun = 0, resp = SRP_TSK_MGMT_COMPLETE;
842     SCSIDevice *d;
843     uint64_t tag = iu->srp.rsp.tag;
844     uint8_t sol_not = iu->srp.cmd.sol_not;
845 
846     fprintf(stderr, "vscsi_process_tsk_mgmt %02x\n",
847             iu->srp.tsk_mgmt.tsk_mgmt_func);
848 
849     d = vscsi_device_find(&s->bus, be64_to_cpu(req->iu.srp.tsk_mgmt.lun), &lun);
850     if (!d) {
851         resp = SRP_TSK_MGMT_FIELDS_INVALID;
852     } else {
853         switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
854         case SRP_TSK_ABORT_TASK:
855             if (d->lun != lun) {
856                 resp = SRP_TSK_MGMT_FIELDS_INVALID;
857                 break;
858             }
859 
860             tmpreq = vscsi_find_req(s, req->iu.srp.tsk_mgmt.task_tag);
861             if (tmpreq && tmpreq->sreq) {
862                 assert(tmpreq->sreq->hba_private);
863                 scsi_req_cancel(tmpreq->sreq);
864             }
865             break;
866 
867         case SRP_TSK_LUN_RESET:
868             if (d->lun != lun) {
869                 resp = SRP_TSK_MGMT_FIELDS_INVALID;
870                 break;
871             }
872 
873             qdev_reset_all(&d->qdev);
874             break;
875 
876         case SRP_TSK_ABORT_TASK_SET:
877         case SRP_TSK_CLEAR_TASK_SET:
878             if (d->lun != lun) {
879                 resp = SRP_TSK_MGMT_FIELDS_INVALID;
880                 break;
881             }
882 
883             for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
884                 tmpreq = &s->reqs[i];
885                 if (tmpreq->iu.srp.cmd.lun != req->iu.srp.tsk_mgmt.lun) {
886                     continue;
887                 }
888                 if (!tmpreq->active || !tmpreq->sreq) {
889                     continue;
890                 }
891                 assert(tmpreq->sreq->hba_private);
892                 scsi_req_cancel(tmpreq->sreq);
893             }
894             break;
895 
896         case SRP_TSK_CLEAR_ACA:
897             resp = SRP_TSK_MGMT_NOT_SUPPORTED;
898             break;
899 
900         default:
901             resp = SRP_TSK_MGMT_FIELDS_INVALID;
902             break;
903         }
904     }
905 
906     /* Compose the response here as  */
907     memset(iu, 0, sizeof(struct srp_rsp) + 4);
908     iu->srp.rsp.opcode = SRP_RSP;
909     iu->srp.rsp.req_lim_delta = cpu_to_be32(1);
910     iu->srp.rsp.tag = tag;
911     iu->srp.rsp.flags |= SRP_RSP_FLAG_RSPVALID;
912     iu->srp.rsp.resp_data_len = cpu_to_be32(4);
913     if (resp) {
914         iu->srp.rsp.sol_not = (sol_not & 0x04) >> 2;
915     } else {
916         iu->srp.rsp.sol_not = (sol_not & 0x02) >> 1;
917     }
918 
919     iu->srp.rsp.status = GOOD;
920     iu->srp.rsp.data[3] = resp;
921 
922     vscsi_send_iu(s, req, sizeof(iu->srp.rsp) + 4, VIOSRP_SRP_FORMAT);
923 
924     return 1;
925 }
926 
927 static int vscsi_handle_srp_req(VSCSIState *s, vscsi_req *req)
928 {
929     union srp_iu *srp = &req->iu.srp;
930     int done = 1;
931     uint8_t opcode = srp->rsp.opcode;
932 
933     switch (opcode) {
934     case SRP_LOGIN_REQ:
935         vscsi_process_login(s, req);
936         break;
937     case SRP_TSK_MGMT:
938         done = vscsi_process_tsk_mgmt(s, req);
939         break;
940     case SRP_CMD:
941         done = vscsi_queue_cmd(s, req);
942         break;
943     case SRP_LOGIN_RSP:
944     case SRP_I_LOGOUT:
945     case SRP_T_LOGOUT:
946     case SRP_RSP:
947     case SRP_CRED_REQ:
948     case SRP_CRED_RSP:
949     case SRP_AER_REQ:
950     case SRP_AER_RSP:
951         fprintf(stderr, "VSCSI: Unsupported opcode %02x\n", opcode);
952         break;
953     default:
954         fprintf(stderr, "VSCSI: Unknown type %02x\n", opcode);
955     }
956 
957     return done;
958 }
959 
960 static int vscsi_send_adapter_info(VSCSIState *s, vscsi_req *req)
961 {
962     struct viosrp_adapter_info *sinfo;
963     struct mad_adapter_info_data info;
964     int rc;
965 
966     sinfo = &req->iu.mad.adapter_info;
967 
968 #if 0 /* What for ? */
969     rc = spapr_vio_dma_read(&s->vdev, be64_to_cpu(sinfo->buffer),
970                             &info, be16_to_cpu(sinfo->common.length));
971     if (rc) {
972         fprintf(stderr, "vscsi_send_adapter_info: DMA read failure !\n");
973     }
974 #endif
975     memset(&info, 0, sizeof(info));
976     strcpy(info.srp_version, SRP_VERSION);
977     memcpy(info.partition_name, "qemu", sizeof("qemu"));
978     info.partition_number = cpu_to_be32(0);
979     info.mad_version = cpu_to_be32(1);
980     info.os_type = cpu_to_be32(2);
981     info.port_max_txu[0] = cpu_to_be32(VSCSI_MAX_SECTORS << 9);
982 
983     rc = spapr_vio_dma_write(&s->vdev, be64_to_cpu(sinfo->buffer),
984                              &info, be16_to_cpu(sinfo->common.length));
985     if (rc)  {
986         fprintf(stderr, "vscsi_send_adapter_info: DMA write failure !\n");
987     }
988 
989     sinfo->common.status = rc ? cpu_to_be32(1) : 0;
990 
991     return vscsi_send_iu(s, req, sizeof(*sinfo), VIOSRP_MAD_FORMAT);
992 }
993 
994 static int vscsi_send_capabilities(VSCSIState *s, vscsi_req *req)
995 {
996     struct viosrp_capabilities *vcap;
997     struct capabilities cap = { };
998     uint16_t len, req_len;
999     uint64_t buffer;
1000     int rc;
1001 
1002     vcap = &req->iu.mad.capabilities;
1003     req_len = len = be16_to_cpu(vcap->common.length);
1004     buffer = be64_to_cpu(vcap->buffer);
1005     if (len > sizeof(cap)) {
1006         fprintf(stderr, "vscsi_send_capabilities: capabilities size mismatch !\n");
1007 
1008         /*
1009          * Just read and populate the structure that is known.
1010          * Zero rest of the structure.
1011          */
1012         len = sizeof(cap);
1013     }
1014     rc = spapr_vio_dma_read(&s->vdev, buffer, &cap, len);
1015     if (rc)  {
1016         fprintf(stderr, "vscsi_send_capabilities: DMA read failure !\n");
1017     }
1018 
1019     /*
1020      * Current implementation does not suppport any migration or
1021      * reservation capabilities. Construct the response telling the
1022      * guest not to use them.
1023      */
1024     cap.flags = 0;
1025     cap.migration.ecl = 0;
1026     cap.reserve.type = 0;
1027     cap.migration.common.server_support = 0;
1028     cap.reserve.common.server_support = 0;
1029 
1030     rc = spapr_vio_dma_write(&s->vdev, buffer, &cap, len);
1031     if (rc)  {
1032         fprintf(stderr, "vscsi_send_capabilities: DMA write failure !\n");
1033     }
1034     if (req_len > len) {
1035         /*
1036          * Being paranoid and lets not worry about the error code
1037          * here. Actual write of the cap is done above.
1038          */
1039         spapr_vio_dma_set(&s->vdev, (buffer + len), 0, (req_len - len));
1040     }
1041     vcap->common.status = rc ? cpu_to_be32(1) : 0;
1042     return vscsi_send_iu(s, req, sizeof(*vcap), VIOSRP_MAD_FORMAT);
1043 }
1044 
1045 static int vscsi_handle_mad_req(VSCSIState *s, vscsi_req *req)
1046 {
1047     union mad_iu *mad = &req->iu.mad;
1048     bool request_handled = false;
1049     uint64_t retlen = 0;
1050 
1051     switch (be32_to_cpu(mad->empty_iu.common.type)) {
1052     case VIOSRP_EMPTY_IU_TYPE:
1053         fprintf(stderr, "Unsupported EMPTY MAD IU\n");
1054         retlen = sizeof(mad->empty_iu);
1055         break;
1056     case VIOSRP_ERROR_LOG_TYPE:
1057         fprintf(stderr, "Unsupported ERROR LOG MAD IU\n");
1058         retlen = sizeof(mad->error_log);
1059         break;
1060     case VIOSRP_ADAPTER_INFO_TYPE:
1061         vscsi_send_adapter_info(s, req);
1062         request_handled = true;
1063         break;
1064     case VIOSRP_HOST_CONFIG_TYPE:
1065         retlen = sizeof(mad->host_config);
1066         break;
1067     case VIOSRP_CAPABILITIES_TYPE:
1068         vscsi_send_capabilities(s, req);
1069         request_handled = true;
1070         break;
1071     default:
1072         fprintf(stderr, "VSCSI: Unknown MAD type %02x\n",
1073                 be32_to_cpu(mad->empty_iu.common.type));
1074         /*
1075          * PAPR+ says that "The length field is set to the length
1076          * of the data structure(s) used in the command".
1077          * As we did not recognize the request type, put zero there.
1078          */
1079         retlen = 0;
1080     }
1081 
1082     if (!request_handled) {
1083         mad->empty_iu.common.status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED);
1084         vscsi_send_iu(s, req, retlen, VIOSRP_MAD_FORMAT);
1085     }
1086 
1087     return 1;
1088 }
1089 
1090 static void vscsi_got_payload(VSCSIState *s, vscsi_crq *crq)
1091 {
1092     vscsi_req *req;
1093     int done;
1094 
1095     req = vscsi_get_req(s);
1096     if (req == NULL) {
1097         fprintf(stderr, "VSCSI: Failed to get a request !\n");
1098         return;
1099     }
1100 
1101     /* We only support a limited number of descriptors, we know
1102      * the ibmvscsi driver uses up to 10 max, so it should fit
1103      * in our 256 bytes IUs. If not we'll have to increase the size
1104      * of the structure.
1105      */
1106     if (crq->s.IU_length > sizeof(union viosrp_iu)) {
1107         fprintf(stderr, "VSCSI: SRP IU too long (%d bytes) !\n",
1108                 crq->s.IU_length);
1109         vscsi_put_req(req);
1110         return;
1111     }
1112 
1113     /* XXX Handle failure differently ? */
1114     if (spapr_vio_dma_read(&s->vdev, crq->s.IU_data_ptr, &req->iu,
1115                            crq->s.IU_length)) {
1116         fprintf(stderr, "vscsi_got_payload: DMA read failure !\n");
1117         vscsi_put_req(req);
1118         return;
1119     }
1120     memcpy(&req->crq, crq, sizeof(vscsi_crq));
1121 
1122     if (crq->s.format == VIOSRP_MAD_FORMAT) {
1123         done = vscsi_handle_mad_req(s, req);
1124     } else {
1125         done = vscsi_handle_srp_req(s, req);
1126     }
1127 
1128     if (done) {
1129         vscsi_put_req(req);
1130     }
1131 }
1132 
1133 
1134 static int vscsi_do_crq(struct VIOsPAPRDevice *dev, uint8_t *crq_data)
1135 {
1136     VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(dev);
1137     vscsi_crq crq;
1138 
1139     memcpy(crq.raw, crq_data, 16);
1140     crq.s.timeout = be16_to_cpu(crq.s.timeout);
1141     crq.s.IU_length = be16_to_cpu(crq.s.IU_length);
1142     crq.s.IU_data_ptr = be64_to_cpu(crq.s.IU_data_ptr);
1143 
1144     DPRINTF("VSCSI: do_crq %02x %02x ...\n", crq.raw[0], crq.raw[1]);
1145 
1146     switch (crq.s.valid) {
1147     case 0xc0: /* Init command/response */
1148 
1149         /* Respond to initialization request */
1150         if (crq.s.format == 0x01) {
1151             memset(crq.raw, 0, 16);
1152             crq.s.valid = 0xc0;
1153             crq.s.format = 0x02;
1154             spapr_vio_send_crq(dev, crq.raw);
1155         }
1156 
1157         /* Note that in hotplug cases, we might get a 0x02
1158          * as a result of us emitting the init request
1159          */
1160 
1161         break;
1162     case 0xff: /* Link event */
1163 
1164         /* Not handled for now */
1165 
1166         break;
1167     case 0x80: /* Payloads */
1168         switch (crq.s.format) {
1169         case VIOSRP_SRP_FORMAT: /* AKA VSCSI request */
1170         case VIOSRP_MAD_FORMAT: /* AKA VSCSI response */
1171             vscsi_got_payload(s, &crq);
1172             break;
1173         case VIOSRP_OS400_FORMAT:
1174         case VIOSRP_AIX_FORMAT:
1175         case VIOSRP_LINUX_FORMAT:
1176         case VIOSRP_INLINE_FORMAT:
1177             fprintf(stderr, "vscsi_do_srq: Unsupported payload format %02x\n",
1178                     crq.s.format);
1179             break;
1180         default:
1181             fprintf(stderr, "vscsi_do_srq: Unknown payload format %02x\n",
1182                     crq.s.format);
1183         }
1184         break;
1185     default:
1186         fprintf(stderr, "vscsi_do_crq: unknown CRQ %02x %02x ...\n",
1187                 crq.raw[0], crq.raw[1]);
1188     };
1189 
1190     return 0;
1191 }
1192 
1193 static const struct SCSIBusInfo vscsi_scsi_info = {
1194     .tcq = true,
1195     .max_channel = 7, /* logical unit addressing format */
1196     .max_target = 63,
1197     .max_lun = 31,
1198 
1199     .transfer_data = vscsi_transfer_data,
1200     .complete = vscsi_command_complete,
1201     .cancel = vscsi_request_cancelled,
1202     .save_request = vscsi_save_request,
1203     .load_request = vscsi_load_request,
1204 };
1205 
1206 static void spapr_vscsi_reset(VIOsPAPRDevice *dev)
1207 {
1208     VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(dev);
1209     int i;
1210 
1211     memset(s->reqs, 0, sizeof(s->reqs));
1212     for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
1213         s->reqs[i].qtag = i;
1214     }
1215 }
1216 
1217 static void spapr_vscsi_realize(VIOsPAPRDevice *dev, Error **errp)
1218 {
1219     VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(dev);
1220 
1221     dev->crq.SendFunc = vscsi_do_crq;
1222 
1223     scsi_bus_new(&s->bus, sizeof(s->bus), DEVICE(dev),
1224                  &vscsi_scsi_info, NULL);
1225     if (!dev->qdev.hotplugged) {
1226         scsi_bus_legacy_handle_cmdline(&s->bus, errp);
1227     }
1228 }
1229 
1230 void spapr_vscsi_create(VIOsPAPRBus *bus)
1231 {
1232     DeviceState *dev;
1233 
1234     dev = qdev_create(&bus->bus, "spapr-vscsi");
1235 
1236     qdev_init_nofail(dev);
1237 }
1238 
1239 static int spapr_vscsi_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
1240 {
1241     int ret;
1242 
1243     ret = fdt_setprop_cell(fdt, node_off, "#address-cells", 2);
1244     if (ret < 0) {
1245         return ret;
1246     }
1247 
1248     ret = fdt_setprop_cell(fdt, node_off, "#size-cells", 0);
1249     if (ret < 0) {
1250         return ret;
1251     }
1252 
1253     return 0;
1254 }
1255 
1256 static Property spapr_vscsi_properties[] = {
1257     DEFINE_SPAPR_PROPERTIES(VSCSIState, vdev),
1258     DEFINE_PROP_END_OF_LIST(),
1259 };
1260 
1261 static const VMStateDescription vmstate_spapr_vscsi = {
1262     .name = "spapr_vscsi",
1263     .version_id = 1,
1264     .minimum_version_id = 1,
1265     .fields = (VMStateField[]) {
1266         VMSTATE_SPAPR_VIO(vdev, VSCSIState),
1267         /* VSCSI state */
1268         /* ???? */
1269 
1270         VMSTATE_END_OF_LIST()
1271     },
1272 };
1273 
1274 static void spapr_vscsi_class_init(ObjectClass *klass, void *data)
1275 {
1276     DeviceClass *dc = DEVICE_CLASS(klass);
1277     VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
1278 
1279     k->realize = spapr_vscsi_realize;
1280     k->reset = spapr_vscsi_reset;
1281     k->devnode = spapr_vscsi_devnode;
1282     k->dt_name = "v-scsi";
1283     k->dt_type = "vscsi";
1284     k->dt_compatible = "IBM,v-scsi";
1285     k->signal_mask = 0x00000001;
1286     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1287     dc->props = spapr_vscsi_properties;
1288     k->rtce_window_size = 0x10000000;
1289     dc->vmsd = &vmstate_spapr_vscsi;
1290 }
1291 
1292 static const TypeInfo spapr_vscsi_info = {
1293     .name          = TYPE_VIO_SPAPR_VSCSI_DEVICE,
1294     .parent        = TYPE_VIO_SPAPR_DEVICE,
1295     .instance_size = sizeof(VSCSIState),
1296     .class_init    = spapr_vscsi_class_init,
1297 };
1298 
1299 static void spapr_vscsi_register_types(void)
1300 {
1301     type_register_static(&spapr_vscsi_info);
1302 }
1303 
1304 type_init(spapr_vscsi_register_types)
1305