hw/spapr_vscsi.c

   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 "hw.h"
  35 #include "scsi.h"
  36 #include "scsi-defs.h"
  37 #include "srp.h"
  38 #include "hw/qdev.h"
  39 #include "hw/spapr.h"
  40 #include "hw/spapr_vio.h"
  41 #include "hw/ppc-viosrp.h"
  42
  43 #include <libfdt.h>
  44
  45 /*#define DEBUG_VSCSI*/
  46
  47 #ifdef DEBUG_VSCSI
  48 #define dprintf(fmt, ...) \
  49     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  50 #else
  51 #define dprintf(fmt, ...) \
  52     do { } while (0)
  53 #endif
  54
  55 /*
  56  * Virtual SCSI device
  57  */
  58
  59 /* Random numbers */
  60 #define VSCSI_MAX_SECTORS       4096
  61 #define VSCSI_REQ_LIMIT         24
  62
  63 #define SCSI_SENSE_BUF_SIZE     96
  64 #define SRP_RSP_SENSE_DATA_LEN  18
  65
  66 typedef union vscsi_crq {
  67     struct viosrp_crq s;
  68     uint8_t raw[16];
  69 } vscsi_crq;
  70
  71 typedef struct vscsi_req {
  72     vscsi_crq               crq;
  73     union viosrp_iu         iu;
  74
  75     /* SCSI request tracking */
  76     SCSIRequest             *sreq;
  77     uint32_t                qtag; /* qemu tag != srp tag */
  78     int                     lun;
  79     int                     active;
  80     long                    data_len;
  81     int                     writing;
  82     int                     senselen;
  83     uint8_t                 sense[SCSI_SENSE_BUF_SIZE];
  84
  85     /* RDMA related bits */
  86     uint8_t                 dma_fmt;
  87     struct srp_direct_buf   ext_desc;
  88     struct srp_direct_buf   *cur_desc;
  89     struct srp_indirect_buf *ind_desc;
  90     int                     local_desc;
  91     int                     total_desc;
  92 } vscsi_req;
  93
  94
  95 typedef struct {
  96     VIOsPAPRDevice vdev;
  97     SCSIBus bus;
  98     vscsi_req reqs[VSCSI_REQ_LIMIT];
  99 } VSCSIState;
 100
 101 static struct vscsi_req *vscsi_get_req(VSCSIState *s)
 102 {
 103     vscsi_req *req;
 104     int i;
 105
 106     for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
 107         req = &s->reqs[i];
 108         if (!req->active) {
 109             memset(req, 0, sizeof(*req));
 110             req->qtag = i;
 111             req->active = 1;
 112             return req;
 113         }
 114     }
 115     return NULL;
 116 }
 117
 118 static void vscsi_put_req(vscsi_req *req)
 119 {
 120     if (req->sreq != NULL) {
 121         scsi_req_unref(req->sreq);
 122     }
 123     req->sreq = NULL;
 124     req->active = 0;
 125 }
 126
 127 static SCSIDevice *vscsi_device_find(SCSIBus *bus, uint64_t srp_lun, int *lun)
 128 {
 129     int channel = 0, id = 0;
 130
 131 retry:
 132     switch (srp_lun >> 62) {
 133     case 0:
 134         if ((srp_lun >> 56) != 0) {
 135             channel = (srp_lun >> 56) & 0x3f;
 136             id = (srp_lun >> 48) & 0xff;
 137             srp_lun <<= 16;
 138             goto retry;
 139         }
 140         *lun = (srp_lun >> 48) & 0xff;
 141         break;
 142
 143     case 1:
 144         *lun = (srp_lun >> 48) & 0x3fff;
 145         break;
 146     case 2:
 147         channel = (srp_lun >> 53) & 0x7;
 148         id = (srp_lun >> 56) & 0x3f;
 149         *lun = (srp_lun >> 48) & 0x1f;
 150         break;
 151     case 3:
 152         *lun = -1;
 153         return NULL;
 154     default:
 155         abort();
 156     }
 157
 158     return scsi_device_find(bus, channel, id, *lun);
 159 }
 160
 161 static int vscsi_send_iu(VSCSIState *s, vscsi_req *req,
 162                          uint64_t length, uint8_t format)
 163 {
 164     long rc, rc1;
 165
 166     /* First copy the SRP */
 167     rc = spapr_vio_dma_write(&s->vdev, req->crq.s.IU_data_ptr,
 168                              &req->iu, length);
 169     if (rc) {
 170         fprintf(stderr, "vscsi_send_iu: DMA write failure !\n");
 171     }
 172
 173     req->crq.s.valid = 0x80;
 174     req->crq.s.format = format;
 175     req->crq.s.reserved = 0x00;
 176     req->crq.s.timeout = cpu_to_be16(0x0000);
 177     req->crq.s.IU_length = cpu_to_be16(length);
 178     req->crq.s.IU_data_ptr = req->iu.srp.rsp.tag; /* right byte order */
 179
 180     if (rc == 0) {
 181         req->crq.s.status = 0x99; /* Just needs to be non-zero */
 182     } else {
 183         req->crq.s.status = 0x00;
 184     }
 185
 186     rc1 = spapr_vio_send_crq(&s->vdev, req->crq.raw);
 187     if (rc1) {
 188         fprintf(stderr, "vscsi_send_iu: Error sending response\n");
 189         return rc1;
 190     }
 191
 192     return rc;
 193 }
 194
 195 static void vscsi_makeup_sense(VSCSIState *s, vscsi_req *req,
 196                                uint8_t key, uint8_t asc, uint8_t ascq)
 197 {
 198     req->senselen = SRP_RSP_SENSE_DATA_LEN;
 199
 200     /* Valid bit and 'current errors' */
 201     req->sense[0] = (0x1 << 7 | 0x70);
 202     /* Sense key */
 203     req->sense[2] = key;
 204     /* Additional sense length */
 205     req->sense[7] = 0xa; /* 10 bytes */
 206     /* Additional sense code */
 207     req->sense[12] = asc;
 208     req->sense[13] = ascq;
 209 }
 210
 211 static int vscsi_send_rsp(VSCSIState *s, vscsi_req *req,
 212                           uint8_t status, int32_t res_in, int32_t res_out)
 213 {
 214     union viosrp_iu *iu = &req->iu;
 215     uint64_t tag = iu->srp.rsp.tag;
 216     int total_len = sizeof(iu->srp.rsp);
 217
 218     dprintf("VSCSI: Sending resp status: 0x%x, "
 219             "res_in: %d, res_out: %d\n", status, res_in, res_out);
 220
 221     memset(iu, 0, sizeof(struct srp_rsp));
 222     iu->srp.rsp.opcode = SRP_RSP;
 223     iu->srp.rsp.req_lim_delta = cpu_to_be32(1);
 224     iu->srp.rsp.tag = tag;
 225
 226     /* Handle residuals */
 227     if (res_in < 0) {
 228         iu->srp.rsp.flags |= SRP_RSP_FLAG_DIUNDER;
 229         res_in = -res_in;
 230     } else if (res_in) {
 231         iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER;
 232     }
 233     if (res_out < 0) {
 234         iu->srp.rsp.flags |= SRP_RSP_FLAG_DOUNDER;
 235         res_out = -res_out;
 236     } else if (res_out) {
 237         iu->srp.rsp.flags |= SRP_RSP_FLAG_DOOVER;
 238     }
 239     iu->srp.rsp.data_in_res_cnt = cpu_to_be32(res_in);
 240     iu->srp.rsp.data_out_res_cnt = cpu_to_be32(res_out);
 241
 242     /* We don't do response data */
 243     /* iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID; */
 244     iu->srp.rsp.resp_data_len = cpu_to_be32(0);
 245
 246     /* Handle success vs. failure */
 247     iu->srp.rsp.status = status;
 248     if (status) {
 249         iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x04) >> 2;
 250         if (req->senselen) {
 251             req->iu.srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
 252             req->iu.srp.rsp.sense_data_len = cpu_to_be32(req->senselen);
 253             memcpy(req->iu.srp.rsp.data, req->sense, req->senselen);
 254             total_len += req->senselen;
 255         }
 256     } else {
 257         iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x02) >> 1;
 258     }
 259
 260     vscsi_send_iu(s, req, total_len, VIOSRP_SRP_FORMAT);
 261     return 0;
 262 }
 263
 264 static inline void vscsi_swap_desc(struct srp_direct_buf *desc)
 265 {
 266     desc->va = be64_to_cpu(desc->va);
 267     desc->len = be32_to_cpu(desc->len);
 268 }
 269
 270 static int vscsi_srp_direct_data(VSCSIState *s, vscsi_req *req,
 271                                  uint8_t *buf, uint32_t len)
 272 {
 273     struct srp_direct_buf *md = req->cur_desc;
 274     uint32_t llen;
 275     int rc = 0;
 276
 277     dprintf("VSCSI: direct segment 0x%x bytes, va=0x%llx desc len=0x%x\n",
 278             len, (unsigned long long)md->va, md->len);
 279
 280     llen = MIN(len, md->len);
 281     if (llen) {
 282         if (req->writing) { /* writing = to device = reading from memory */
 283             rc = spapr_vio_dma_read(&s->vdev, md->va, buf, llen);
 284         } else {
 285             rc = spapr_vio_dma_write(&s->vdev, md->va, buf, llen);
 286         }
 287     }
 288     md->len -= llen;
 289     md->va += llen;
 290
 291     if (rc) {
 292         return -1;
 293     }
 294     return llen;
 295 }
 296
 297 static int vscsi_srp_indirect_data(VSCSIState *s, vscsi_req *req,
 298                                    uint8_t *buf, uint32_t len)
 299 {
 300     struct srp_direct_buf *td = &req->ind_desc->table_desc;
 301     struct srp_direct_buf *md = req->cur_desc;
 302     int rc = 0;
 303     uint32_t llen, total = 0;
 304
 305     dprintf("VSCSI: indirect segment 0x%x bytes, td va=0x%llx len=0x%x\n",
 306             len, (unsigned long long)td->va, td->len);
 307
 308     /* While we have data ... */
 309     while (len) {
 310         /* If we have a descriptor but it's empty, go fetch a new one */
 311         if (md && md->len == 0) {
 312             /* More local available, use one */
 313             if (req->local_desc) {
 314                 md = ++req->cur_desc;
 315                 --req->local_desc;
 316                 --req->total_desc;
 317                 td->va += sizeof(struct srp_direct_buf);
 318             } else {
 319                 md = req->cur_desc = NULL;
 320             }
 321         }
 322         /* No descriptor at hand, fetch one */
 323         if (!md) {
 324             if (!req->total_desc) {
 325                 dprintf("VSCSI:   Out of descriptors !\n");
 326                 break;
 327             }
 328             md = req->cur_desc = &req->ext_desc;
 329             dprintf("VSCSI:   Reading desc from 0x%llx\n",
 330                     (unsigned long long)td->va);
 331             rc = spapr_vio_dma_read(&s->vdev, td->va, md,
 332                                     sizeof(struct srp_direct_buf));
 333             if (rc) {
 334                 dprintf("VSCSI: spapr_vio_dma_read -> %d reading ext_desc\n",
 335                         rc);
 336                 break;
 337             }
 338             vscsi_swap_desc(md);
 339             td->va += sizeof(struct srp_direct_buf);
 340             --req->total_desc;
 341         }
 342         dprintf("VSCSI:   [desc va=0x%llx,len=0x%x] remaining=0x%x\n",
 343                 (unsigned long long)md->va, md->len, len);
 344
 345         /* Perform transfer */
 346         llen = MIN(len, md->len);
 347         if (req->writing) { /* writing = to device = reading from memory */
 348             rc = spapr_vio_dma_read(&s->vdev, md->va, buf, llen);
 349         } else {
 350             rc = spapr_vio_dma_write(&s->vdev, md->va, buf, llen);
 351         }
 352         if (rc) {
 353             dprintf("VSCSI: spapr_vio_dma_r/w(%d) -> %d\n", req->writing, rc);
 354             break;
 355         }
 356         dprintf("VSCSI:     data: %02x %02x %02x %02x...\n",
 357                 buf[0], buf[1], buf[2], buf[3]);
 358
 359         len -= llen;
 360         buf += llen;
 361         total += llen;
 362         md->va += llen;
 363         md->len -= llen;
 364     }
 365     return rc ? -1 : total;
 366 }
 367
 368 static int vscsi_srp_transfer_data(VSCSIState *s, vscsi_req *req,
 369                                    int writing, uint8_t *buf, uint32_t len)
 370 {
 371     int err = 0;
 372
 373     switch (req->dma_fmt) {
 374     case SRP_NO_DATA_DESC:
 375         dprintf("VSCSI: no data desc transfer, skipping 0x%x bytes\n", len);
 376         break;
 377     case SRP_DATA_DESC_DIRECT:
 378         err = vscsi_srp_direct_data(s, req, buf, len);
 379         break;
 380     case SRP_DATA_DESC_INDIRECT:
 381         err = vscsi_srp_indirect_data(s, req, buf, len);
 382         break;
 383     }
 384     return err;
 385 }
 386
 387 /* Bits from linux srp */
 388 static int data_out_desc_size(struct srp_cmd *cmd)
 389 {
 390     int size = 0;
 391     uint8_t fmt = cmd->buf_fmt >> 4;
 392
 393     switch (fmt) {
 394     case SRP_NO_DATA_DESC:
 395         break;
 396     case SRP_DATA_DESC_DIRECT:
 397         size = sizeof(struct srp_direct_buf);
 398         break;
 399     case SRP_DATA_DESC_INDIRECT:
 400         size = sizeof(struct srp_indirect_buf) +
 401             sizeof(struct srp_direct_buf)*cmd->data_out_desc_cnt;
 402         break;
 403     default:
 404         break;
 405     }
 406     return size;
 407 }
 408
 409 static int vscsi_preprocess_desc(vscsi_req *req)
 410 {
 411     struct srp_cmd *cmd = &req->iu.srp.cmd;
 412     int offset, i;
 413
 414     offset = cmd->add_cdb_len & ~3;
 415
 416     if (req->writing) {
 417         req->dma_fmt = cmd->buf_fmt >> 4;
 418     } else {
 419         offset += data_out_desc_size(cmd);
 420         req->dma_fmt = cmd->buf_fmt & ((1U << 4) - 1);
 421     }
 422
 423     switch (req->dma_fmt) {
 424     case SRP_NO_DATA_DESC:
 425         break;
 426     case SRP_DATA_DESC_DIRECT:
 427         req->cur_desc = (struct srp_direct_buf *)(cmd->add_data + offset);
 428         req->total_desc = req->local_desc = 1;
 429         vscsi_swap_desc(req->cur_desc);
 430         dprintf("VSCSI: using direct RDMA %s, 0x%x bytes MD: 0x%llx\n",
 431                 req->writing ? "write" : "read",
 432                 req->cur_desc->len, (unsigned long long)req->cur_desc->va);
 433         break;
 434     case SRP_DATA_DESC_INDIRECT:
 435         req->ind_desc = (struct srp_indirect_buf *)(cmd->add_data + offset);
 436         vscsi_swap_desc(&req->ind_desc->table_desc);
 437         req->total_desc = req->ind_desc->table_desc.len /
 438             sizeof(struct srp_direct_buf);
 439         req->local_desc = req->writing ? cmd->data_out_desc_cnt :
 440             cmd->data_in_desc_cnt;
 441         for (i = 0; i < req->local_desc; i++) {
 442             vscsi_swap_desc(&req->ind_desc->desc_list[i]);
 443         }
 444         req->cur_desc = req->local_desc ? &req->ind_desc->desc_list[0] : NULL;
 445         dprintf("VSCSI: using indirect RDMA %s, 0x%x bytes %d descs "
 446                 "(%d local) VA: 0x%llx\n",
 447                 req->writing ? "read" : "write",
 448                 be32_to_cpu(req->ind_desc->len),
 449                 req->total_desc, req->local_desc,
 450                 (unsigned long long)req->ind_desc->table_desc.va);
 451         break;
 452     default:
 453         fprintf(stderr,
 454                 "vscsi_preprocess_desc: Unknown format %x\n", req->dma_fmt);
 455         return -1;
 456     }
 457
 458     return 0;
 459 }
 460
 461 /* Callback to indicate that the SCSI layer has completed a transfer.  */
 462 static void vscsi_transfer_data(SCSIRequest *sreq, uint32_t len)
 463 {
 464     VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent);
 465     vscsi_req *req = sreq->hba_private;
 466     uint8_t *buf;
 467     int rc = 0;
 468
 469     dprintf("VSCSI: SCSI xfer complete tag=0x%x len=0x%x, req=%p\n",
 470             sreq->tag, len, req);
 471     if (req == NULL) {
 472         fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
 473         return;
 474     }
 475
 476     if (len) {
 477         buf = scsi_req_get_buf(sreq);
 478         rc = vscsi_srp_transfer_data(s, req, req->writing, buf, len);
 479     }
 480     if (rc < 0) {
 481         fprintf(stderr, "VSCSI: RDMA error rc=%d!\n", rc);
 482         vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
 483         scsi_req_abort(req->sreq, CHECK_CONDITION);
 484         return;
 485     }
 486
 487     /* Start next chunk */
 488     req->data_len -= rc;
 489     scsi_req_continue(sreq);
 490 }
 491
 492 /* Callback to indicate that the SCSI layer has completed a transfer.  */
 493 static void vscsi_command_complete(SCSIRequest *sreq, uint32_t status, size_t resid)
 494 {
 495     VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent);
 496     vscsi_req *req = sreq->hba_private;
 497     int32_t res_in = 0, res_out = 0;
 498
 499     dprintf("VSCSI: SCSI cmd complete, r=0x%x tag=0x%x status=0x%x, req=%p\n",
 500             reason, sreq->tag, status, req);
 501     if (req == NULL) {
 502         fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
 503         return;
 504     }
 505
 506     if (status == CHECK_CONDITION) {
 507         req->senselen = scsi_req_get_sense(req->sreq, req->sense,
 508                                            sizeof(req->sense));
 509         dprintf("VSCSI: Sense data, %d bytes:\n", len);
 510         dprintf("       %02x  %02x  %02x  %02x  %02x  %02x  %02x  %02x\n",
 511                 req->sense[0], req->sense[1], req->sense[2], req->sense[3],
 512                 req->sense[4], req->sense[5], req->sense[6], req->sense[7]);
 513         dprintf("       %02x  %02x  %02x  %02x  %02x  %02x  %02x  %02x\n",
 514                 req->sense[8], req->sense[9], req->sense[10], req->sense[11],
 515                 req->sense[12], req->sense[13], req->sense[14], req->sense[15]);
 516     }
 517
 518     dprintf("VSCSI: Command complete err=%d\n", status);
 519     if (status == 0) {
 520         /* We handle overflows, not underflows for normal commands,
 521          * but hopefully nobody cares
 522          */
 523         if (req->writing) {
 524             res_out = req->data_len;
 525         } else {
 526             res_in = req->data_len;
 527         }
 528     }
 529     vscsi_send_rsp(s, req, status, res_in, res_out);
 530     vscsi_put_req(req);
 531 }
 532
 533 static void vscsi_request_cancelled(SCSIRequest *sreq)
 534 {
 535     vscsi_req *req = sreq->hba_private;
 536
 537     vscsi_put_req(req);
 538 }
 539
 540 static void vscsi_process_login(VSCSIState *s, vscsi_req *req)
 541 {
 542     union viosrp_iu *iu = &req->iu;
 543     struct srp_login_rsp *rsp = &iu->srp.login_rsp;
 544     uint64_t tag = iu->srp.rsp.tag;
 545
 546     dprintf("VSCSI: Got login, sendin response !\n");
 547
 548     /* TODO handle case that requested size is wrong and
 549      * buffer format is wrong
 550      */
 551     memset(iu, 0, sizeof(struct srp_login_rsp));
 552     rsp->opcode = SRP_LOGIN_RSP;
 553     /* Don't advertise quite as many request as we support to
 554      * keep room for management stuff etc...
 555      */
 556     rsp->req_lim_delta = cpu_to_be32(VSCSI_REQ_LIMIT-2);
 557     rsp->tag = tag;
 558     rsp->max_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
 559     rsp->max_ti_iu_len = cpu_to_be32(sizeof(union srp_iu));
 560     /* direct and indirect */
 561     rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT);
 562
 563     vscsi_send_iu(s, req, sizeof(*rsp), VIOSRP_SRP_FORMAT);
 564 }
 565
 566 static void vscsi_inquiry_no_target(VSCSIState *s, vscsi_req *req)
 567 {
 568     uint8_t *cdb = req->iu.srp.cmd.cdb;
 569     uint8_t resp_data[36];
 570     int rc, len, alen;
 571
 572     /* We dont do EVPD. Also check that page_code is 0 */
 573     if ((cdb[1] & 0x01) || (cdb[1] & 0x01) || cdb[2] != 0) {
 574         /* Send INVALID FIELD IN CDB */
 575         vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0);
 576         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
 577         return;
 578     }
 579     alen = cdb[3];
 580     alen = (alen << 8) | cdb[4];
 581     len = MIN(alen, 36);
 582
 583     /* Fake up inquiry using PQ=3 */
 584     memset(resp_data, 0, 36);
 585     resp_data[0] = 0x7f;   /* Not capable of supporting a device here */
 586     resp_data[2] = 0x06;   /* SPS-4 */
 587     resp_data[3] = 0x02;   /* Resp data format */
 588     resp_data[4] = 36 - 5; /* Additional length */
 589     resp_data[7] = 0x10;   /* Sync transfers */
 590     memcpy(&resp_data[16], "QEMU EMPTY      ", 16);
 591     memcpy(&resp_data[8], "QEMU    ", 8);
 592
 593     req->writing = 0;
 594     vscsi_preprocess_desc(req);
 595     rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len);
 596     if (rc < 0) {
 597         vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
 598         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
 599     } else {
 600         vscsi_send_rsp(s, req, 0, 36 - rc, 0);
 601     }
 602 }
 603
 604 static int vscsi_queue_cmd(VSCSIState *s, vscsi_req *req)
 605 {
 606     union srp_iu *srp = &req->iu.srp;
 607     SCSIDevice *sdev;
 608     int n, lun;
 609
 610     sdev = vscsi_device_find(&s->bus, be64_to_cpu(srp->cmd.lun), &lun);
 611     if (!sdev) {
 612         dprintf("VSCSI: Command for lun %08" PRIx64 " with no drive\n", be64_to_cpu(srp->cmd.lun));
 613         if (srp->cmd.cdb[0] == INQUIRY) {
 614             vscsi_inquiry_no_target(s, req);
 615         } else {
 616             vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0x00);
 617             vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
 618         } return 1;
 619     }
 620
 621     req->lun = lun;
 622     req->sreq = scsi_req_new(sdev, req->qtag, lun, srp->cmd.cdb, req);
 623     n = scsi_req_enqueue(req->sreq);
 624
 625     dprintf("VSCSI: Queued command tag 0x%x CMD 0x%x ID %d LUN %d ret: %d\n",
 626             req->qtag, srp->cmd.cdb[0], id, lun, n);
 627
 628     if (n) {
 629         /* Transfer direction must be set before preprocessing the
 630          * descriptors
 631          */
 632         req->writing = (n < 1);
 633
 634         /* Preprocess RDMA descriptors */
 635         vscsi_preprocess_desc(req);
 636
 637         /* Get transfer direction and initiate transfer */
 638         if (n > 0) {
 639             req->data_len = n;
 640         } else if (n < 0) {
 641             req->data_len = -n;
 642         }
 643         scsi_req_continue(req->sreq);
 644     }
 645     /* Don't touch req here, it may have been recycled already */
 646
 647     return 0;
 648 }
 649
 650 static int vscsi_process_tsk_mgmt(VSCSIState *s, vscsi_req *req)
 651 {
 652     union viosrp_iu *iu = &req->iu;
 653     int fn;
 654
 655     fprintf(stderr, "vscsi_process_tsk_mgmt %02x\n",
 656             iu->srp.tsk_mgmt.tsk_mgmt_func);
 657
 658     switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
 659 #if 0 /* We really don't deal with these for now */
 660     case SRP_TSK_ABORT_TASK:
 661         fn = ABORT_TASK;
 662         break;
 663     case SRP_TSK_ABORT_TASK_SET:
 664         fn = ABORT_TASK_SET;
 665         break;
 666     case SRP_TSK_CLEAR_TASK_SET:
 667         fn = CLEAR_TASK_SET;
 668         break;
 669     case SRP_TSK_LUN_RESET:
 670         fn = LOGICAL_UNIT_RESET;
 671         break;
 672     case SRP_TSK_CLEAR_ACA:
 673         fn = CLEAR_ACA;
 674         break;
 675 #endif
 676     default:
 677         fn = 0;
 678     }
 679     if (fn) {
 680         /* XXX Send/Handle target task management */
 681         ;
 682     } else {
 683         vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x20, 0);
 684         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
 685     }
 686     return !fn;
 687 }
 688
 689 static int vscsi_handle_srp_req(VSCSIState *s, vscsi_req *req)
 690 {
 691     union srp_iu *srp = &req->iu.srp;
 692     int done = 1;
 693     uint8_t opcode = srp->rsp.opcode;
 694
 695     switch (opcode) {
 696     case SRP_LOGIN_REQ:
 697         vscsi_process_login(s, req);
 698         break;
 699     case SRP_TSK_MGMT:
 700         done = vscsi_process_tsk_mgmt(s, req);
 701         break;
 702     case SRP_CMD:
 703         done = vscsi_queue_cmd(s, req);
 704         break;
 705     case SRP_LOGIN_RSP:
 706     case SRP_I_LOGOUT:
 707     case SRP_T_LOGOUT:
 708     case SRP_RSP:
 709     case SRP_CRED_REQ:
 710     case SRP_CRED_RSP:
 711     case SRP_AER_REQ:
 712     case SRP_AER_RSP:
 713         fprintf(stderr, "VSCSI: Unsupported opcode %02x\n", opcode);
 714         break;
 715     default:
 716         fprintf(stderr, "VSCSI: Unknown type %02x\n", opcode);
 717     }
 718
 719     return done;
 720 }
 721
 722 static int vscsi_send_adapter_info(VSCSIState *s, vscsi_req *req)
 723 {
 724     struct viosrp_adapter_info *sinfo;
 725     struct mad_adapter_info_data info;
 726     int rc;
 727
 728     sinfo = &req->iu.mad.adapter_info;
 729
 730 #if 0 /* What for ? */
 731     rc = spapr_vio_dma_read(&s->vdev, be64_to_cpu(sinfo->buffer),
 732                             &info, be16_to_cpu(sinfo->common.length));
 733     if (rc) {
 734         fprintf(stderr, "vscsi_send_adapter_info: DMA read failure !\n");
 735     }
 736 #endif
 737     memset(&info, 0, sizeof(info));
 738     strcpy(info.srp_version, SRP_VERSION);
 739     memcpy(info.partition_name, "qemu", sizeof("qemu"));
 740     info.partition_number = cpu_to_be32(0);
 741     info.mad_version = cpu_to_be32(1);
 742     info.os_type = cpu_to_be32(2);
 743     info.port_max_txu[0] = cpu_to_be32(VSCSI_MAX_SECTORS << 9);
 744
 745     rc = spapr_vio_dma_write(&s->vdev, be64_to_cpu(sinfo->buffer),
 746                              &info, be16_to_cpu(sinfo->common.length));
 747     if (rc)  {
 748         fprintf(stderr, "vscsi_send_adapter_info: DMA write failure !\n");
 749     }
 750
 751     sinfo->common.status = rc ? cpu_to_be32(1) : 0;
 752
 753     return vscsi_send_iu(s, req, sizeof(*sinfo), VIOSRP_MAD_FORMAT);
 754 }
 755
 756 static int vscsi_handle_mad_req(VSCSIState *s, vscsi_req *req)
 757 {
 758     union mad_iu *mad = &req->iu.mad;
 759
 760     switch (be32_to_cpu(mad->empty_iu.common.type)) {
 761     case VIOSRP_EMPTY_IU_TYPE:
 762         fprintf(stderr, "Unsupported EMPTY MAD IU\n");
 763         break;
 764     case VIOSRP_ERROR_LOG_TYPE:
 765         fprintf(stderr, "Unsupported ERROR LOG MAD IU\n");
 766         mad->error_log.common.status = cpu_to_be16(1);
 767         vscsi_send_iu(s, req, sizeof(mad->error_log), VIOSRP_MAD_FORMAT);
 768         break;
 769     case VIOSRP_ADAPTER_INFO_TYPE:
 770         vscsi_send_adapter_info(s, req);
 771         break;
 772     case VIOSRP_HOST_CONFIG_TYPE:
 773         mad->host_config.common.status = cpu_to_be16(1);
 774         vscsi_send_iu(s, req, sizeof(mad->host_config), VIOSRP_MAD_FORMAT);
 775         break;
 776     default:
 777         fprintf(stderr, "VSCSI: Unknown MAD type %02x\n",
 778                 be32_to_cpu(mad->empty_iu.common.type));
 779     }
 780
 781     return 1;
 782 }
 783
 784 static void vscsi_got_payload(VSCSIState *s, vscsi_crq *crq)
 785 {
 786     vscsi_req *req;
 787     int done;
 788
 789     req = vscsi_get_req(s);
 790     if (req == NULL) {
 791         fprintf(stderr, "VSCSI: Failed to get a request !\n");
 792         return;
 793     }
 794
 795     /* We only support a limited number of descriptors, we know
 796      * the ibmvscsi driver uses up to 10 max, so it should fit
 797      * in our 256 bytes IUs. If not we'll have to increase the size
 798      * of the structure.
 799      */
 800     if (crq->s.IU_length > sizeof(union viosrp_iu)) {
 801         fprintf(stderr, "VSCSI: SRP IU too long (%d bytes) !\n",
 802                 crq->s.IU_length);
 803         vscsi_put_req(req);
 804         return;
 805     }
 806
 807     /* XXX Handle failure differently ? */
 808     if (spapr_vio_dma_read(&s->vdev, crq->s.IU_data_ptr, &req->iu,
 809                            crq->s.IU_length)) {
 810         fprintf(stderr, "vscsi_got_payload: DMA read failure !\n");
 811         vscsi_put_req(req);
 812         return;
 813     }
 814     memcpy(&req->crq, crq, sizeof(vscsi_crq));
 815
 816     if (crq->s.format == VIOSRP_MAD_FORMAT) {
 817         done = vscsi_handle_mad_req(s, req);
 818     } else {
 819         done = vscsi_handle_srp_req(s, req);
 820     }
 821
 822     if (done) {
 823         vscsi_put_req(req);
 824     }
 825 }
 826
 827
 828 static int vscsi_do_crq(struct VIOsPAPRDevice *dev, uint8_t *crq_data)
 829 {
 830     VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
 831     vscsi_crq crq;
 832
 833     memcpy(crq.raw, crq_data, 16);
 834     crq.s.timeout = be16_to_cpu(crq.s.timeout);
 835     crq.s.IU_length = be16_to_cpu(crq.s.IU_length);
 836     crq.s.IU_data_ptr = be64_to_cpu(crq.s.IU_data_ptr);
 837
 838     dprintf("VSCSI: do_crq %02x %02x ...\n", crq.raw[0], crq.raw[1]);
 839
 840     switch (crq.s.valid) {
 841     case 0xc0: /* Init command/response */
 842
 843         /* Respond to initialization request */
 844         if (crq.s.format == 0x01) {
 845             memset(crq.raw, 0, 16);
 846             crq.s.valid = 0xc0;
 847             crq.s.format = 0x02;
 848             spapr_vio_send_crq(dev, crq.raw);
 849         }
 850
 851         /* Note that in hotplug cases, we might get a 0x02
 852          * as a result of us emitting the init request
 853          */
 854
 855         break;
 856     case 0xff: /* Link event */
 857
 858         /* Not handled for now */
 859
 860         break;
 861     case 0x80: /* Payloads */
 862         switch (crq.s.format) {
 863         case VIOSRP_SRP_FORMAT: /* AKA VSCSI request */
 864         case VIOSRP_MAD_FORMAT: /* AKA VSCSI response */
 865             vscsi_got_payload(s, &crq);
 866             break;
 867         case VIOSRP_OS400_FORMAT:
 868         case VIOSRP_AIX_FORMAT:
 869         case VIOSRP_LINUX_FORMAT:
 870         case VIOSRP_INLINE_FORMAT:
 871             fprintf(stderr, "vscsi_do_srq: Unsupported payload format %02x\n",
 872                     crq.s.format);
 873             break;
 874         default:
 875             fprintf(stderr, "vscsi_do_srq: Unknown payload format %02x\n",
 876                     crq.s.format);
 877         }
 878         break;
 879     default:
 880         fprintf(stderr, "vscsi_do_crq: unknown CRQ %02x %02x ...\n",
 881                 crq.raw[0], crq.raw[1]);
 882     };
 883
 884     return 0;
 885 }
 886
 887 static const struct SCSIBusInfo vscsi_scsi_info = {
 888     .tcq = true,
 889     .max_channel = 7, /* logical unit addressing format */
 890     .max_target = 63,
 891     .max_lun = 31,
 892
 893     .transfer_data = vscsi_transfer_data,
 894     .complete = vscsi_command_complete,
 895     .cancel = vscsi_request_cancelled
 896 };
 897
 898 static void spapr_vscsi_reset(VIOsPAPRDevice *dev)
 899 {
 900     VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
 901     int i;
 902
 903     memset(s->reqs, 0, sizeof(s->reqs));
 904     for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
 905         s->reqs[i].qtag = i;
 906     }
 907 }
 908
 909 static int spapr_vscsi_init(VIOsPAPRDevice *dev)
 910 {
 911     VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
 912
 913     dev->crq.SendFunc = vscsi_do_crq;
 914
 915     scsi_bus_new(&s->bus, &dev->qdev, &vscsi_scsi_info);
 916     if (!dev->qdev.hotplugged) {
 917         scsi_bus_legacy_handle_cmdline(&s->bus);
 918     }
 919
 920     return 0;
 921 }
 922
 923 void spapr_vscsi_create(VIOsPAPRBus *bus)
 924 {
 925     DeviceState *dev;
 926
 927     dev = qdev_create(&bus->bus, "spapr-vscsi");
 928
 929     qdev_init_nofail(dev);
 930 }
 931
 932 static int spapr_vscsi_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
 933 {
 934     int ret;
 935
 936     ret = fdt_setprop_cell(fdt, node_off, "#address-cells", 2);
 937     if (ret < 0) {
 938         return ret;
 939     }
 940
 941     ret = fdt_setprop_cell(fdt, node_off, "#size-cells", 0);
 942     if (ret < 0) {
 943         return ret;
 944     }
 945
 946     return 0;
 947 }
 948
 949 static Property spapr_vscsi_properties[] = {
 950     DEFINE_SPAPR_PROPERTIES(VSCSIState, vdev),
 951     DEFINE_PROP_END_OF_LIST(),
 952 };
 953
 954 static void spapr_vscsi_class_init(ObjectClass *klass, void *data)
 955 {
 956     DeviceClass *dc = DEVICE_CLASS(klass);
 957     VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
 958
 959     k->init = spapr_vscsi_init;
 960     k->reset = spapr_vscsi_reset;
 961     k->devnode = spapr_vscsi_devnode;
 962     k->dt_name = "v-scsi";
 963     k->dt_type = "vscsi";
 964     k->dt_compatible = "IBM,v-scsi";
 965     k->signal_mask = 0x00000001;
 966     dc->props = spapr_vscsi_properties;
 967     k->rtce_window_size = 0x10000000;
 968 }
 969
 970 static const TypeInfo spapr_vscsi_info = {
 971     .name          = "spapr-vscsi",
 972     .parent        = TYPE_VIO_SPAPR_DEVICE,
 973     .instance_size = sizeof(VSCSIState),
 974     .class_init    = spapr_vscsi_class_init,
 975 };
 976
 977 static void spapr_vscsi_register_types(void)
 978 {
 979     type_register_static(&spapr_vscsi_info);
 980 }
 981
 982 type_init(spapr_vscsi_register_types)