xref: /openbmc/qemu/hw/scsi/spapr_vscsi.c (revision 587adaca)
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 
35 #include "qemu/osdep.h"
36 #include "qemu/module.h"
37 #include "hw/scsi/scsi.h"
38 #include "migration/vmstate.h"
39 #include "scsi/constants.h"
40 #include "srp.h"
41 #include "hw/ppc/spapr.h"
42 #include "hw/ppc/spapr_vio.h"
43 #include "hw/qdev-properties.h"
44 #include "viosrp.h"
45 #include "trace.h"
46 
47 #include <libfdt.h>
48 #include "qom/object.h"
49 
50 /*
51  * Virtual SCSI device
52  */
53 
54 /* Random numbers */
55 #define VSCSI_MAX_SECTORS       4096
56 #define VSCSI_REQ_LIMIT         24
57 
58 /* Maximum size of a IU payload */
59 #define SRP_MAX_IU_DATA_LEN     (SRP_MAX_IU_LEN - sizeof(union srp_iu))
60 #define SRP_RSP_SENSE_DATA_LEN  18
61 
62 #define SRP_REPORT_LUNS_WLUN    0xc10100000000000ULL
63 
64 typedef union vscsi_crq {
65     struct viosrp_crq s;
66     uint8_t raw[16];
67 } vscsi_crq;
68 
69 typedef struct vscsi_req {
70     vscsi_crq               crq;
71     uint8_t                 viosrp_iu_buf[SRP_MAX_IU_LEN];
72 
73     /* SCSI request tracking */
74     SCSIRequest             *sreq;
75     uint32_t                qtag; /* qemu tag != srp tag */
76     bool                    active;
77     bool                    writing;
78     bool                    dma_error;
79     uint32_t                data_len;
80     uint32_t                senselen;
81     uint8_t                 sense[SCSI_SENSE_BUF_SIZE];
82 
83     /* RDMA related bits */
84     uint8_t                 dma_fmt;
85     uint16_t                local_desc;
86     uint16_t                total_desc;
87     uint16_t                cdb_offset;
88     uint16_t                cur_desc_num;
89     uint16_t                cur_desc_offset;
90 } vscsi_req;
91 
92 #define TYPE_VIO_SPAPR_VSCSI_DEVICE "spapr-vscsi"
93 OBJECT_DECLARE_SIMPLE_TYPE(VSCSIState, VIO_SPAPR_VSCSI_DEVICE)
94 
95 struct VSCSIState {
96     SpaprVioDevice vdev;
97     SCSIBus bus;
98     vscsi_req reqs[VSCSI_REQ_LIMIT];
99 };
100 
101 static union viosrp_iu *req_iu(vscsi_req *req)
102 {
103     return (union viosrp_iu *)req->viosrp_iu_buf;
104 }
105 
106 static struct vscsi_req *vscsi_get_req(VSCSIState *s)
107 {
108     vscsi_req *req;
109     int i;
110 
111     for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
112         req = &s->reqs[i];
113         if (!req->active) {
114             memset(req, 0, sizeof(*req));
115             req->qtag = i;
116             req->active = 1;
117             return req;
118         }
119     }
120     return NULL;
121 }
122 
123 static struct vscsi_req *vscsi_find_req(VSCSIState *s, uint64_t srp_tag)
124 {
125     vscsi_req *req;
126     int i;
127 
128     for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
129         req = &s->reqs[i];
130         if (req_iu(req)->srp.cmd.tag == srp_tag) {
131             return req;
132         }
133     }
134     return NULL;
135 }
136 
137 static void vscsi_put_req(vscsi_req *req)
138 {
139     if (req->sreq != NULL) {
140         scsi_req_unref(req->sreq);
141     }
142     req->sreq = NULL;
143     req->active = 0;
144 }
145 
146 static SCSIDevice *vscsi_device_find(SCSIBus *bus, uint64_t srp_lun, int *lun)
147 {
148     int channel = 0, id = 0;
149 
150 retry:
151     switch (srp_lun >> 62) {
152     case 0:
153         if ((srp_lun >> 56) != 0) {
154             channel = (srp_lun >> 56) & 0x3f;
155             id = (srp_lun >> 48) & 0xff;
156             srp_lun <<= 16;
157             goto retry;
158         }
159         *lun = (srp_lun >> 48) & 0xff;
160         break;
161 
162     case 1:
163         *lun = (srp_lun >> 48) & 0x3fff;
164         break;
165     case 2:
166         channel = (srp_lun >> 53) & 0x7;
167         id = (srp_lun >> 56) & 0x3f;
168         *lun = (srp_lun >> 48) & 0x1f;
169         break;
170     case 3:
171         *lun = -1;
172         return NULL;
173     default:
174         abort();
175     }
176 
177     return scsi_device_find(bus, channel, id, *lun);
178 }
179 
180 static int vscsi_send_iu(VSCSIState *s, vscsi_req *req,
181                          uint64_t length, uint8_t format)
182 {
183     long rc, rc1;
184 
185     assert(length <= SRP_MAX_IU_LEN);
186 
187     /* First copy the SRP */
188     rc = spapr_vio_dma_write(&s->vdev, req->crq.s.IU_data_ptr,
189                              &req->viosrp_iu_buf, 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(req)->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(req);
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     trace_spapr_vscsi_send_rsp(status, res_in, res_out);
241 
242     memset(iu, 0, sizeof(struct srp_rsp));
243     iu->srp.rsp.opcode = SRP_RSP;
244     iu->srp.rsp.req_lim_delta = cpu_to_be32(1);
245     iu->srp.rsp.tag = tag;
246 
247     /* Handle residuals */
248     if (res_in < 0) {
249         iu->srp.rsp.flags |= SRP_RSP_FLAG_DIUNDER;
250         res_in = -res_in;
251     } else if (res_in) {
252         iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER;
253     }
254     if (res_out < 0) {
255         iu->srp.rsp.flags |= SRP_RSP_FLAG_DOUNDER;
256         res_out = -res_out;
257     } else if (res_out) {
258         iu->srp.rsp.flags |= SRP_RSP_FLAG_DOOVER;
259     }
260     iu->srp.rsp.data_in_res_cnt = cpu_to_be32(res_in);
261     iu->srp.rsp.data_out_res_cnt = cpu_to_be32(res_out);
262 
263     /* We don't do response data */
264     /* iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID; */
265     iu->srp.rsp.resp_data_len = cpu_to_be32(0);
266 
267     /* Handle success vs. failure */
268     iu->srp.rsp.status = status;
269     if (status) {
270         iu->srp.rsp.sol_not = (sol_not & 0x04) >> 2;
271         if (req->senselen) {
272             int sense_data_len = MIN(req->senselen, SRP_MAX_IU_DATA_LEN);
273 
274             iu->srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
275             iu->srp.rsp.sense_data_len = cpu_to_be32(sense_data_len);
276             memcpy(iu->srp.rsp.data, req->sense, sense_data_len);
277             total_len += sense_data_len;
278         }
279     } else {
280         iu->srp.rsp.sol_not = (sol_not & 0x02) >> 1;
281     }
282 
283     vscsi_send_iu(s, req, total_len, VIOSRP_SRP_FORMAT);
284     return 0;
285 }
286 
287 static inline struct srp_direct_buf vscsi_swap_desc(struct srp_direct_buf desc)
288 {
289     desc.va = be64_to_cpu(desc.va);
290     desc.len = be32_to_cpu(desc.len);
291     return desc;
292 }
293 
294 static int vscsi_fetch_desc(VSCSIState *s, struct vscsi_req *req,
295                             unsigned n, unsigned buf_offset,
296                             struct srp_direct_buf *ret)
297 {
298     struct srp_cmd *cmd = &req_iu(req)->srp.cmd;
299 
300     switch (req->dma_fmt) {
301     case SRP_NO_DATA_DESC: {
302         trace_spapr_vscsi_fetch_desc_no_data();
303         return 0;
304     }
305     case SRP_DATA_DESC_DIRECT: {
306         memcpy(ret, cmd->add_data + req->cdb_offset, sizeof(*ret));
307         assert(req->cur_desc_num == 0);
308         trace_spapr_vscsi_fetch_desc_direct();
309         break;
310     }
311     case SRP_DATA_DESC_INDIRECT: {
312         struct srp_indirect_buf *tmp = (struct srp_indirect_buf *)
313                                        (cmd->add_data + req->cdb_offset);
314         if (n < req->local_desc) {
315             *ret = tmp->desc_list[n];
316             trace_spapr_vscsi_fetch_desc_indirect(req->qtag, n,
317                                                   req->local_desc);
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                 trace_spapr_vscsi_fetch_desc_out_of_range(n, desc_offset);
325                 return -1;
326             }
327             rc = spapr_vio_dma_read(&s->vdev, tbl_desc.va + desc_offset,
328                                     ret, sizeof(struct srp_direct_buf));
329             if (rc) {
330                 trace_spapr_vscsi_fetch_desc_dma_read_error(rc);
331                 return -1;
332             }
333             trace_spapr_vscsi_fetch_desc_indirect_seg_ext(req->qtag, n,
334                                                           req->total_desc,
335                                                           tbl_desc.va,
336                                                           tbl_desc.len);
337         } else {
338             trace_spapr_vscsi_fetch_desc_out_of_desc();
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         trace_spapr_vscsi_fetch_desc_out_of_desc_boundary(buf_offset,
351                                                           req->cur_desc_num,
352                                                           ret->len);
353         return -1;
354     }
355     ret->va += buf_offset;
356     ret->len -= buf_offset;
357 
358     trace_spapr_vscsi_fetch_desc_done(req->cur_desc_num, req->cur_desc_offset,
359                                       ret->va, ret->len);
360 
361     return ret->len ? 1 : 0;
362 }
363 
364 static int vscsi_srp_direct_data(VSCSIState *s, vscsi_req *req,
365                                  uint8_t *buf, uint32_t len)
366 {
367     struct srp_direct_buf md;
368     uint32_t llen;
369     int rc = 0;
370 
371     rc = vscsi_fetch_desc(s, req, req->cur_desc_num, req->cur_desc_offset, &md);
372     if (rc < 0) {
373         return -1;
374     } else if (rc == 0) {
375         return 0;
376     }
377 
378     llen = MIN(len, md.len);
379     if (llen) {
380         if (req->writing) { /* writing = to device = reading from memory */
381             rc = spapr_vio_dma_read(&s->vdev, md.va, buf, llen);
382         } else {
383             rc = spapr_vio_dma_write(&s->vdev, md.va, buf, llen);
384         }
385     }
386 
387     if (rc) {
388         return -1;
389     }
390     req->cur_desc_offset += llen;
391 
392     return llen;
393 }
394 
395 static int vscsi_srp_indirect_data(VSCSIState *s, vscsi_req *req,
396                                    uint8_t *buf, uint32_t len)
397 {
398     struct srp_direct_buf md;
399     int rc = 0;
400     uint32_t llen, total = 0;
401 
402     trace_spapr_vscsi_srp_indirect_data(len);
403 
404     /* While we have data ... */
405     while (len) {
406         rc = vscsi_fetch_desc(s, req, req->cur_desc_num, req->cur_desc_offset, &md);
407         if (rc < 0) {
408             return -1;
409         } else if (rc == 0) {
410             break;
411         }
412 
413         /* Perform transfer */
414         llen = MIN(len, md.len);
415         if (req->writing) { /* writing = to device = reading from memory */
416             rc = spapr_vio_dma_read(&s->vdev, md.va, buf, llen);
417         } else {
418             rc = spapr_vio_dma_write(&s->vdev, md.va, buf, llen);
419         }
420         if (rc) {
421             trace_spapr_vscsi_srp_indirect_data_rw(req->writing, rc);
422             break;
423         }
424         trace_spapr_vscsi_srp_indirect_data_buf(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         trace_spapr_vscsi_srp_transfer_data(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(req)->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     trace_spapr_vscsi_transfer_data(sreq->tag, len, req);
531     if (req == NULL) {
532         fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
533         return;
534     }
535 
536     if (len) {
537         buf = scsi_req_get_buf(sreq);
538         rc = vscsi_srp_transfer_data(s, req, req->writing, buf, len);
539     }
540     if (rc < 0) {
541         fprintf(stderr, "VSCSI: RDMA error rc=%d!\n", rc);
542         req->dma_error = true;
543         scsi_req_cancel(req->sreq);
544         return;
545     }
546 
547     /* Start next chunk */
548     req->data_len -= rc;
549     scsi_req_continue(sreq);
550 }
551 
552 /* Callback to indicate that the SCSI layer has completed a transfer.  */
553 static void vscsi_command_complete(SCSIRequest *sreq, size_t resid)
554 {
555     VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(sreq->bus->qbus.parent);
556     vscsi_req *req = sreq->hba_private;
557     int32_t res_in = 0, res_out = 0;
558 
559     trace_spapr_vscsi_command_complete(sreq->tag, sreq->status, req);
560     if (req == NULL) {
561         fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
562         return;
563     }
564 
565     if (sreq->status == CHECK_CONDITION) {
566         req->senselen = scsi_req_get_sense(req->sreq, req->sense,
567                                            sizeof(req->sense));
568         trace_spapr_vscsi_command_complete_sense_data1(req->senselen,
569                 req->sense[0], req->sense[1], req->sense[2], req->sense[3],
570                 req->sense[4], req->sense[5], req->sense[6], req->sense[7]);
571         trace_spapr_vscsi_command_complete_sense_data2(
572                 req->sense[8], req->sense[9], req->sense[10], req->sense[11],
573                 req->sense[12], req->sense[13], req->sense[14], req->sense[15]);
574     }
575 
576     trace_spapr_vscsi_command_complete_status(sreq->status);
577     if (sreq->status == 0) {
578         /* We handle overflows, not underflows for normal commands,
579          * but hopefully nobody cares
580          */
581         if (req->writing) {
582             res_out = req->data_len;
583         } else {
584             res_in = req->data_len;
585         }
586     }
587     vscsi_send_rsp(s, req, sreq->status, res_in, res_out);
588     vscsi_put_req(req);
589 }
590 
591 static void vscsi_request_cancelled(SCSIRequest *sreq)
592 {
593     vscsi_req *req = sreq->hba_private;
594 
595     if (req->dma_error) {
596         VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(sreq->bus->qbus.parent);
597 
598         vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
599         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
600     }
601     vscsi_put_req(req);
602 }
603 
604 static const VMStateDescription vmstate_spapr_vscsi_req = {
605     .name = "spapr_vscsi_req",
606     .version_id = 1,
607     .minimum_version_id = 1,
608     .fields = (VMStateField[]) {
609         VMSTATE_BUFFER(crq.raw, vscsi_req),
610         VMSTATE_BUFFER(viosrp_iu_buf, vscsi_req),
611         VMSTATE_UINT32(qtag, vscsi_req),
612         VMSTATE_BOOL(active, vscsi_req),
613         VMSTATE_UINT32(data_len, vscsi_req),
614         VMSTATE_BOOL(writing, vscsi_req),
615         VMSTATE_UINT32(senselen, vscsi_req),
616         VMSTATE_BUFFER(sense, vscsi_req),
617         VMSTATE_UINT8(dma_fmt, vscsi_req),
618         VMSTATE_UINT16(local_desc, vscsi_req),
619         VMSTATE_UINT16(total_desc, vscsi_req),
620         VMSTATE_UINT16(cdb_offset, vscsi_req),
621       /*Restart SCSI request from the beginning for now */
622       /*VMSTATE_UINT16(cur_desc_num, vscsi_req),
623         VMSTATE_UINT16(cur_desc_offset, vscsi_req),*/
624         VMSTATE_END_OF_LIST()
625     },
626 };
627 
628 static void vscsi_save_request(QEMUFile *f, SCSIRequest *sreq)
629 {
630     vscsi_req *req = sreq->hba_private;
631     assert(req->active);
632 
633     vmstate_save_state(f, &vmstate_spapr_vscsi_req, req, NULL);
634 
635     trace_spapr_vscsi_save_request(req->qtag, req->cur_desc_num,
636                                    req->cur_desc_offset);
637 }
638 
639 static void *vscsi_load_request(QEMUFile *f, SCSIRequest *sreq)
640 {
641     SCSIBus *bus = sreq->bus;
642     VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(bus->qbus.parent);
643     vscsi_req *req;
644     int rc;
645 
646     assert(sreq->tag < VSCSI_REQ_LIMIT);
647     req = &s->reqs[sreq->tag];
648     assert(!req->active);
649 
650     memset(req, 0, sizeof(*req));
651     rc = vmstate_load_state(f, &vmstate_spapr_vscsi_req, req, 1);
652     if (rc) {
653         fprintf(stderr, "VSCSI: failed loading request tag#%u\n", sreq->tag);
654         return NULL;
655     }
656     assert(req->active);
657 
658     req->sreq = scsi_req_ref(sreq);
659 
660     trace_spapr_vscsi_load_request(req->qtag, req->cur_desc_num,
661                                    req->cur_desc_offset);
662 
663     return req;
664 }
665 
666 static void vscsi_process_login(VSCSIState *s, vscsi_req *req)
667 {
668     union viosrp_iu *iu = req_iu(req);
669     struct srp_login_rsp *rsp = &iu->srp.login_rsp;
670     uint64_t tag = iu->srp.rsp.tag;
671 
672     trace_spapr_vscsi_process_login();
673 
674     /* TODO handle case that requested size is wrong and
675      * buffer format is wrong
676      */
677     memset(iu, 0, sizeof(struct srp_login_rsp));
678     rsp->opcode = SRP_LOGIN_RSP;
679     /* Don't advertise quite as many request as we support to
680      * keep room for management stuff etc...
681      */
682     rsp->req_lim_delta = cpu_to_be32(VSCSI_REQ_LIMIT-2);
683     rsp->tag = tag;
684     rsp->max_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
685     rsp->max_ti_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
686     /* direct and indirect */
687     rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT);
688 
689     vscsi_send_iu(s, req, sizeof(*rsp), VIOSRP_SRP_FORMAT);
690 }
691 
692 static void vscsi_inquiry_no_target(VSCSIState *s, vscsi_req *req)
693 {
694     uint8_t *cdb = req_iu(req)->srp.cmd.cdb;
695     uint8_t resp_data[36];
696     int rc, len, alen;
697 
698     /* We don't do EVPD. Also check that page_code is 0 */
699     if ((cdb[1] & 0x01) || cdb[2] != 0) {
700         /* Send INVALID FIELD IN CDB */
701         vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0);
702         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
703         return;
704     }
705     alen = cdb[3];
706     alen = (alen << 8) | cdb[4];
707     len = MIN(alen, 36);
708 
709     /* Fake up inquiry using PQ=3 */
710     memset(resp_data, 0, 36);
711     resp_data[0] = 0x7f;   /* Not capable of supporting a device here */
712     resp_data[2] = 0x06;   /* SPS-4 */
713     resp_data[3] = 0x02;   /* Resp data format */
714     resp_data[4] = 36 - 5; /* Additional length */
715     resp_data[7] = 0x10;   /* Sync transfers */
716     memcpy(&resp_data[16], "QEMU EMPTY      ", 16);
717     memcpy(&resp_data[8], "QEMU    ", 8);
718 
719     req->writing = 0;
720     vscsi_preprocess_desc(req);
721     rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len);
722     if (rc < 0) {
723         vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
724         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
725     } else {
726         vscsi_send_rsp(s, req, 0, 36 - rc, 0);
727     }
728 }
729 
730 static void vscsi_report_luns(VSCSIState *s, vscsi_req *req)
731 {
732     BusChild *kid;
733     int i, len, n, rc;
734     uint8_t *resp_data;
735     bool found_lun0;
736 
737     n = 0;
738     found_lun0 = false;
739     QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
740         SCSIDevice *dev = SCSI_DEVICE(kid->child);
741 
742         n += 8;
743         if (dev->channel == 0 && dev->id == 0 && dev->lun == 0) {
744             found_lun0 = true;
745         }
746     }
747     if (!found_lun0) {
748         n += 8;
749     }
750     len = n+8;
751 
752     resp_data = g_malloc0(len);
753     stl_be_p(resp_data, n);
754     i = found_lun0 ? 8 : 16;
755     QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
756         DeviceState *qdev = kid->child;
757         SCSIDevice *dev = SCSI_DEVICE(qdev);
758 
759         if (dev->id == 0 && dev->channel == 0) {
760             resp_data[i] = 0;         /* Use simple LUN for 0 (SAM5 4.7.7.1) */
761         } else {
762             resp_data[i] = (2 << 6);  /* Otherwise LUN addressing (4.7.7.4)  */
763         }
764         resp_data[i] |= dev->id;
765         resp_data[i+1] = (dev->channel << 5);
766         resp_data[i+1] |= dev->lun;
767         i += 8;
768     }
769 
770     vscsi_preprocess_desc(req);
771     rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len);
772     g_free(resp_data);
773     if (rc < 0) {
774         vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
775         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
776     } else {
777         vscsi_send_rsp(s, req, 0, len - rc, 0);
778     }
779 }
780 
781 static int vscsi_queue_cmd(VSCSIState *s, vscsi_req *req)
782 {
783     union srp_iu *srp = &req_iu(req)->srp;
784     SCSIDevice *sdev;
785     int n, lun;
786 
787     if ((srp->cmd.lun == 0 || be64_to_cpu(srp->cmd.lun) == SRP_REPORT_LUNS_WLUN)
788       && srp->cmd.cdb[0] == REPORT_LUNS) {
789         vscsi_report_luns(s, req);
790         return 0;
791     }
792 
793     sdev = vscsi_device_find(&s->bus, be64_to_cpu(srp->cmd.lun), &lun);
794     if (!sdev) {
795         trace_spapr_vscsi_queue_cmd_no_drive(be64_to_cpu(srp->cmd.lun));
796         if (srp->cmd.cdb[0] == INQUIRY) {
797             vscsi_inquiry_no_target(s, req);
798         } else {
799             vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0x00);
800             vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
801         } return 1;
802     }
803 
804     req->sreq = scsi_req_new(sdev, req->qtag, lun, srp->cmd.cdb, req);
805     n = scsi_req_enqueue(req->sreq);
806 
807     trace_spapr_vscsi_queue_cmd(req->qtag, srp->cmd.cdb[0],
808                                 scsi_command_name(srp->cmd.cdb[0]), lun, n);
809 
810     if (n) {
811         /* Transfer direction must be set before preprocessing the
812          * descriptors
813          */
814         req->writing = (n < 1);
815 
816         /* Preprocess RDMA descriptors */
817         vscsi_preprocess_desc(req);
818 
819         /* Get transfer direction and initiate transfer */
820         if (n > 0) {
821             req->data_len = n;
822         } else if (n < 0) {
823             req->data_len = -n;
824         }
825         scsi_req_continue(req->sreq);
826     }
827     /* Don't touch req here, it may have been recycled already */
828 
829     return 0;
830 }
831 
832 static int vscsi_process_tsk_mgmt(VSCSIState *s, vscsi_req *req)
833 {
834     union viosrp_iu *iu = req_iu(req);
835     vscsi_req *tmpreq;
836     int i, lun = 0, resp = SRP_TSK_MGMT_COMPLETE;
837     SCSIDevice *d;
838     uint64_t tag = iu->srp.rsp.tag;
839     uint8_t sol_not = iu->srp.cmd.sol_not;
840 
841     trace_spapr_vscsi_process_tsk_mgmt(iu->srp.tsk_mgmt.tsk_mgmt_func);
842     d = vscsi_device_find(&s->bus,
843                           be64_to_cpu(req_iu(req)->srp.tsk_mgmt.lun), &lun);
844     if (!d) {
845         resp = SRP_TSK_MGMT_FIELDS_INVALID;
846     } else {
847         switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
848         case SRP_TSK_ABORT_TASK:
849             if (d->lun != lun) {
850                 resp = SRP_TSK_MGMT_FIELDS_INVALID;
851                 break;
852             }
853 
854             tmpreq = vscsi_find_req(s, req_iu(req)->srp.tsk_mgmt.task_tag);
855             if (tmpreq && tmpreq->sreq) {
856                 assert(tmpreq->sreq->hba_private);
857                 scsi_req_cancel(tmpreq->sreq);
858             }
859             break;
860 
861         case SRP_TSK_LUN_RESET:
862             if (d->lun != lun) {
863                 resp = SRP_TSK_MGMT_FIELDS_INVALID;
864                 break;
865             }
866 
867             qdev_reset_all(&d->qdev);
868             break;
869 
870         case SRP_TSK_ABORT_TASK_SET:
871         case SRP_TSK_CLEAR_TASK_SET:
872             if (d->lun != lun) {
873                 resp = SRP_TSK_MGMT_FIELDS_INVALID;
874                 break;
875             }
876 
877             for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
878                 tmpreq = &s->reqs[i];
879                 if (req_iu(tmpreq)->srp.cmd.lun
880                         != req_iu(req)->srp.tsk_mgmt.lun) {
881                     continue;
882                 }
883                 if (!tmpreq->active || !tmpreq->sreq) {
884                     continue;
885                 }
886                 assert(tmpreq->sreq->hba_private);
887                 scsi_req_cancel(tmpreq->sreq);
888             }
889             break;
890 
891         case SRP_TSK_CLEAR_ACA:
892             resp = SRP_TSK_MGMT_NOT_SUPPORTED;
893             break;
894 
895         default:
896             resp = SRP_TSK_MGMT_FIELDS_INVALID;
897             break;
898         }
899     }
900 
901     /* Compose the response here as  */
902     QEMU_BUILD_BUG_ON(SRP_MAX_IU_DATA_LEN < 4);
903     memset(iu, 0, sizeof(struct srp_rsp) + 4);
904     iu->srp.rsp.opcode = SRP_RSP;
905     iu->srp.rsp.req_lim_delta = cpu_to_be32(1);
906     iu->srp.rsp.tag = tag;
907     iu->srp.rsp.flags |= SRP_RSP_FLAG_RSPVALID;
908     iu->srp.rsp.resp_data_len = cpu_to_be32(4);
909     if (resp) {
910         iu->srp.rsp.sol_not = (sol_not & 0x04) >> 2;
911     } else {
912         iu->srp.rsp.sol_not = (sol_not & 0x02) >> 1;
913     }
914 
915     iu->srp.rsp.status = GOOD;
916     iu->srp.rsp.data[3] = resp;
917 
918     vscsi_send_iu(s, req, sizeof(iu->srp.rsp) + 4, VIOSRP_SRP_FORMAT);
919 
920     return 1;
921 }
922 
923 static int vscsi_handle_srp_req(VSCSIState *s, vscsi_req *req)
924 {
925     union srp_iu *srp = &req_iu(req)->srp;
926     int done = 1;
927     uint8_t opcode = srp->rsp.opcode;
928 
929     switch (opcode) {
930     case SRP_LOGIN_REQ:
931         vscsi_process_login(s, req);
932         break;
933     case SRP_TSK_MGMT:
934         done = vscsi_process_tsk_mgmt(s, req);
935         break;
936     case SRP_CMD:
937         done = vscsi_queue_cmd(s, req);
938         break;
939     case SRP_LOGIN_RSP:
940     case SRP_I_LOGOUT:
941     case SRP_T_LOGOUT:
942     case SRP_RSP:
943     case SRP_CRED_REQ:
944     case SRP_CRED_RSP:
945     case SRP_AER_REQ:
946     case SRP_AER_RSP:
947         fprintf(stderr, "VSCSI: Unsupported opcode %02x\n", opcode);
948         break;
949     default:
950         fprintf(stderr, "VSCSI: Unknown type %02x\n", opcode);
951     }
952 
953     return done;
954 }
955 
956 static int vscsi_send_adapter_info(VSCSIState *s, vscsi_req *req)
957 {
958     struct viosrp_adapter_info *sinfo;
959     struct mad_adapter_info_data info;
960     int rc;
961 
962     sinfo = &req_iu(req)->mad.adapter_info;
963 
964 #if 0 /* What for ? */
965     rc = spapr_vio_dma_read(&s->vdev, be64_to_cpu(sinfo->buffer),
966                             &info, be16_to_cpu(sinfo->common.length));
967     if (rc) {
968         fprintf(stderr, "vscsi_send_adapter_info: DMA read failure !\n");
969     }
970 #endif
971     memset(&info, 0, sizeof(info));
972     strcpy(info.srp_version, SRP_VERSION);
973     memcpy(info.partition_name, "qemu", sizeof("qemu"));
974     info.partition_number = cpu_to_be32(0);
975     info.mad_version = cpu_to_be32(1);
976     info.os_type = cpu_to_be32(2);
977     info.port_max_txu[0] = cpu_to_be32(VSCSI_MAX_SECTORS << 9);
978 
979     rc = spapr_vio_dma_write(&s->vdev, be64_to_cpu(sinfo->buffer),
980                              &info, be16_to_cpu(sinfo->common.length));
981     if (rc)  {
982         fprintf(stderr, "vscsi_send_adapter_info: DMA write failure !\n");
983     }
984 
985     sinfo->common.status = rc ? cpu_to_be32(1) : 0;
986 
987     return vscsi_send_iu(s, req, sizeof(*sinfo), VIOSRP_MAD_FORMAT);
988 }
989 
990 static int vscsi_send_capabilities(VSCSIState *s, vscsi_req *req)
991 {
992     struct viosrp_capabilities *vcap;
993     struct capabilities cap = { };
994     uint16_t len, req_len;
995     uint64_t buffer;
996     int rc;
997 
998     vcap = &req_iu(req)->mad.capabilities;
999     req_len = len = be16_to_cpu(vcap->common.length);
1000     buffer = be64_to_cpu(vcap->buffer);
1001     if (len > sizeof(cap)) {
1002         fprintf(stderr, "vscsi_send_capabilities: capabilities size mismatch !\n");
1003 
1004         /*
1005          * Just read and populate the structure that is known.
1006          * Zero rest of the structure.
1007          */
1008         len = sizeof(cap);
1009     }
1010     rc = spapr_vio_dma_read(&s->vdev, buffer, &cap, len);
1011     if (rc)  {
1012         fprintf(stderr, "vscsi_send_capabilities: DMA read failure !\n");
1013     }
1014 
1015     /*
1016      * Current implementation does not suppport any migration or
1017      * reservation capabilities. Construct the response telling the
1018      * guest not to use them.
1019      */
1020     cap.flags = 0;
1021     cap.migration.ecl = 0;
1022     cap.reserve.type = 0;
1023     cap.migration.common.server_support = 0;
1024     cap.reserve.common.server_support = 0;
1025 
1026     rc = spapr_vio_dma_write(&s->vdev, buffer, &cap, len);
1027     if (rc)  {
1028         fprintf(stderr, "vscsi_send_capabilities: DMA write failure !\n");
1029     }
1030     if (req_len > len) {
1031         /*
1032          * Being paranoid and lets not worry about the error code
1033          * here. Actual write of the cap is done above.
1034          */
1035         spapr_vio_dma_set(&s->vdev, (buffer + len), 0, (req_len - len));
1036     }
1037     vcap->common.status = rc ? cpu_to_be32(1) : 0;
1038     return vscsi_send_iu(s, req, sizeof(*vcap), VIOSRP_MAD_FORMAT);
1039 }
1040 
1041 static int vscsi_handle_mad_req(VSCSIState *s, vscsi_req *req)
1042 {
1043     union mad_iu *mad = &req_iu(req)->mad;
1044     bool request_handled = false;
1045     uint64_t retlen = 0;
1046 
1047     switch (be32_to_cpu(mad->empty_iu.common.type)) {
1048     case VIOSRP_EMPTY_IU_TYPE:
1049         fprintf(stderr, "Unsupported EMPTY MAD IU\n");
1050         retlen = sizeof(mad->empty_iu);
1051         break;
1052     case VIOSRP_ERROR_LOG_TYPE:
1053         fprintf(stderr, "Unsupported ERROR LOG MAD IU\n");
1054         retlen = sizeof(mad->error_log);
1055         break;
1056     case VIOSRP_ADAPTER_INFO_TYPE:
1057         vscsi_send_adapter_info(s, req);
1058         request_handled = true;
1059         break;
1060     case VIOSRP_HOST_CONFIG_TYPE:
1061         retlen = sizeof(mad->host_config);
1062         break;
1063     case VIOSRP_CAPABILITIES_TYPE:
1064         vscsi_send_capabilities(s, req);
1065         request_handled = true;
1066         break;
1067     default:
1068         fprintf(stderr, "VSCSI: Unknown MAD type %02x\n",
1069                 be32_to_cpu(mad->empty_iu.common.type));
1070         /*
1071          * PAPR+ says that "The length field is set to the length
1072          * of the data structure(s) used in the command".
1073          * As we did not recognize the request type, put zero there.
1074          */
1075         retlen = 0;
1076     }
1077 
1078     if (!request_handled) {
1079         mad->empty_iu.common.status = cpu_to_be16(VIOSRP_MAD_NOT_SUPPORTED);
1080         vscsi_send_iu(s, req, retlen, VIOSRP_MAD_FORMAT);
1081     }
1082 
1083     return 1;
1084 }
1085 
1086 static void vscsi_got_payload(VSCSIState *s, vscsi_crq *crq)
1087 {
1088     vscsi_req *req;
1089     int done;
1090 
1091     req = vscsi_get_req(s);
1092     if (req == NULL) {
1093         fprintf(stderr, "VSCSI: Failed to get a request !\n");
1094         return;
1095     }
1096 
1097     /* We only support a limited number of descriptors, we know
1098      * the ibmvscsi driver uses up to 10 max, so it should fit
1099      * in our 256 bytes IUs. If not we'll have to increase the size
1100      * of the structure.
1101      */
1102     if (crq->s.IU_length > SRP_MAX_IU_LEN) {
1103         fprintf(stderr, "VSCSI: SRP IU too long (%d bytes) !\n",
1104                 crq->s.IU_length);
1105         vscsi_put_req(req);
1106         return;
1107     }
1108 
1109     /* XXX Handle failure differently ? */
1110     if (spapr_vio_dma_read(&s->vdev, crq->s.IU_data_ptr, &req->viosrp_iu_buf,
1111                            crq->s.IU_length)) {
1112         fprintf(stderr, "vscsi_got_payload: DMA read failure !\n");
1113         vscsi_put_req(req);
1114         return;
1115     }
1116     memcpy(&req->crq, crq, sizeof(vscsi_crq));
1117 
1118     if (crq->s.format == VIOSRP_MAD_FORMAT) {
1119         done = vscsi_handle_mad_req(s, req);
1120     } else {
1121         done = vscsi_handle_srp_req(s, req);
1122     }
1123 
1124     if (done) {
1125         vscsi_put_req(req);
1126     }
1127 }
1128 
1129 
1130 static int vscsi_do_crq(struct SpaprVioDevice *dev, uint8_t *crq_data)
1131 {
1132     VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(dev);
1133     vscsi_crq crq;
1134 
1135     memcpy(crq.raw, crq_data, 16);
1136     crq.s.timeout = be16_to_cpu(crq.s.timeout);
1137     crq.s.IU_length = be16_to_cpu(crq.s.IU_length);
1138     crq.s.IU_data_ptr = be64_to_cpu(crq.s.IU_data_ptr);
1139 
1140     trace_spapr_vscsi_do_crq(crq.raw[0], crq.raw[1]);
1141 
1142     switch (crq.s.valid) {
1143     case 0xc0: /* Init command/response */
1144 
1145         /* Respond to initialization request */
1146         if (crq.s.format == 0x01) {
1147             memset(crq.raw, 0, 16);
1148             crq.s.valid = 0xc0;
1149             crq.s.format = 0x02;
1150             spapr_vio_send_crq(dev, crq.raw);
1151         }
1152 
1153         /* Note that in hotplug cases, we might get a 0x02
1154          * as a result of us emitting the init request
1155          */
1156 
1157         break;
1158     case 0xff: /* Link event */
1159 
1160         /* Not handled for now */
1161 
1162         break;
1163     case 0x80: /* Payloads */
1164         switch (crq.s.format) {
1165         case VIOSRP_SRP_FORMAT: /* AKA VSCSI request */
1166         case VIOSRP_MAD_FORMAT: /* AKA VSCSI response */
1167             vscsi_got_payload(s, &crq);
1168             break;
1169         case VIOSRP_OS400_FORMAT:
1170         case VIOSRP_AIX_FORMAT:
1171         case VIOSRP_LINUX_FORMAT:
1172         case VIOSRP_INLINE_FORMAT:
1173             fprintf(stderr, "vscsi_do_srq: Unsupported payload format %02x\n",
1174                     crq.s.format);
1175             break;
1176         default:
1177             fprintf(stderr, "vscsi_do_srq: Unknown payload format %02x\n",
1178                     crq.s.format);
1179         }
1180         break;
1181     default:
1182         fprintf(stderr, "vscsi_do_crq: unknown CRQ %02x %02x ...\n",
1183                 crq.raw[0], crq.raw[1]);
1184     };
1185 
1186     return 0;
1187 }
1188 
1189 static const struct SCSIBusInfo vscsi_scsi_info = {
1190     .tcq = true,
1191     .max_channel = 7, /* logical unit addressing format */
1192     .max_target = 63,
1193     .max_lun = 31,
1194 
1195     .transfer_data = vscsi_transfer_data,
1196     .complete = vscsi_command_complete,
1197     .cancel = vscsi_request_cancelled,
1198     .save_request = vscsi_save_request,
1199     .load_request = vscsi_load_request,
1200 };
1201 
1202 static void spapr_vscsi_reset(SpaprVioDevice *dev)
1203 {
1204     VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(dev);
1205     int i;
1206 
1207     memset(s->reqs, 0, sizeof(s->reqs));
1208     for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
1209         s->reqs[i].qtag = i;
1210     }
1211 }
1212 
1213 static void spapr_vscsi_realize(SpaprVioDevice *dev, Error **errp)
1214 {
1215     VSCSIState *s = VIO_SPAPR_VSCSI_DEVICE(dev);
1216 
1217     dev->crq.SendFunc = vscsi_do_crq;
1218 
1219     scsi_bus_new(&s->bus, sizeof(s->bus), DEVICE(dev),
1220                  &vscsi_scsi_info, NULL);
1221 
1222     /* ibmvscsi SCSI bus does not allow hotplug. */
1223     qbus_set_hotplug_handler(BUS(&s->bus), NULL);
1224 }
1225 
1226 void spapr_vscsi_create(SpaprVioBus *bus)
1227 {
1228     DeviceState *dev;
1229 
1230     dev = qdev_new("spapr-vscsi");
1231 
1232     qdev_realize_and_unref(dev, &bus->bus, &error_fatal);
1233     scsi_bus_legacy_handle_cmdline(&VIO_SPAPR_VSCSI_DEVICE(dev)->bus);
1234 }
1235 
1236 static int spapr_vscsi_devnode(SpaprVioDevice *dev, void *fdt, int node_off)
1237 {
1238     int ret;
1239 
1240     ret = fdt_setprop_cell(fdt, node_off, "#address-cells", 2);
1241     if (ret < 0) {
1242         return ret;
1243     }
1244 
1245     ret = fdt_setprop_cell(fdt, node_off, "#size-cells", 0);
1246     if (ret < 0) {
1247         return ret;
1248     }
1249 
1250     return 0;
1251 }
1252 
1253 static Property spapr_vscsi_properties[] = {
1254     DEFINE_SPAPR_PROPERTIES(VSCSIState, vdev),
1255     DEFINE_PROP_END_OF_LIST(),
1256 };
1257 
1258 static const VMStateDescription vmstate_spapr_vscsi = {
1259     .name = "spapr_vscsi",
1260     .version_id = 1,
1261     .minimum_version_id = 1,
1262     .fields = (VMStateField[]) {
1263         VMSTATE_SPAPR_VIO(vdev, VSCSIState),
1264         /* VSCSI state */
1265         /* ???? */
1266 
1267         VMSTATE_END_OF_LIST()
1268     },
1269 };
1270 
1271 static void spapr_vscsi_class_init(ObjectClass *klass, void *data)
1272 {
1273     DeviceClass *dc = DEVICE_CLASS(klass);
1274     SpaprVioDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
1275 
1276     k->realize = spapr_vscsi_realize;
1277     k->reset = spapr_vscsi_reset;
1278     k->devnode = spapr_vscsi_devnode;
1279     k->dt_name = "v-scsi";
1280     k->dt_type = "vscsi";
1281     k->dt_compatible = "IBM,v-scsi";
1282     k->signal_mask = 0x00000001;
1283     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1284     device_class_set_props(dc, spapr_vscsi_properties);
1285     k->rtce_window_size = 0x10000000;
1286     dc->vmsd = &vmstate_spapr_vscsi;
1287 }
1288 
1289 static const TypeInfo spapr_vscsi_info = {
1290     .name          = TYPE_VIO_SPAPR_VSCSI_DEVICE,
1291     .parent        = TYPE_VIO_SPAPR_DEVICE,
1292     .instance_size = sizeof(VSCSIState),
1293     .class_init    = spapr_vscsi_class_init,
1294 };
1295 
1296 static void spapr_vscsi_register_types(void)
1297 {
1298     type_register_static(&spapr_vscsi_info);
1299 }
1300 
1301 type_init(spapr_vscsi_register_types)
1302