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 "net.h" /* Remove that when we can */
  38 #include "srp.h"
  39 #include "hw/qdev.h"
  40 #include "hw/spapr.h"
  41 #include "hw/spapr_vio.h"
  42 #include "hw/ppc-viosrp.h"
  43
  44 #include <libfdt.h>
  45
  46 /*#define DEBUG_VSCSI*/
  47
  48 #ifdef DEBUG_VSCSI
  49 #define dprintf(fmt, ...) \
  50     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  51 #else
  52 #define dprintf(fmt, ...) \
  53     do { } while (0)
  54 #endif
  55
  56 /*
  57  * Virtual SCSI device
  58  */
  59
  60 /* Random numbers */
  61 #define VSCSI_MAX_SECTORS       4096
  62 #define VSCSI_REQ_LIMIT         24
  63
  64 #define SCSI_SENSE_BUF_SIZE     96
  65 #define SRP_RSP_SENSE_DATA_LEN  18
  66
  67 typedef union vscsi_crq {
  68     struct viosrp_crq s;
  69     uint8_t raw[16];
  70 } vscsi_crq;
  71
  72 typedef struct vscsi_req {
  73     vscsi_crq               crq;
  74     union viosrp_iu         iu;
  75
  76     /* SCSI request tracking */
  77     SCSIRequest             *sreq;
  78     uint32_t                qtag; /* qemu tag != srp tag */
  79     int                     lun;
  80     int                     active;
  81     long                    data_len;
  82     int                     writing;
  83     int                     senselen;
  84     uint8_t                 sense[SCSI_SENSE_BUF_SIZE];
  85
  86     /* RDMA related bits */
  87     uint8_t                 dma_fmt;
  88     struct srp_direct_buf   ext_desc;
  89     struct srp_direct_buf   *cur_desc;
  90     struct srp_indirect_buf *ind_desc;
  91     int                     local_desc;
  92     int                     total_desc;
  93 } vscsi_req;
  94
  95
  96 typedef struct {
  97     VIOsPAPRDevice vdev;
  98     SCSIBus bus;
  99     vscsi_req reqs[VSCSI_REQ_LIMIT];
 100 } VSCSIState;
 101
 102 /* XXX Debug only */
 103 static VSCSIState *dbg_vscsi_state;
 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 void vscsi_put_req(vscsi_req *req)
 124 {
 125     if (req->sreq != NULL) {
 126         scsi_req_unref(req->sreq);
 127     }
 128     req->sreq = NULL;
 129     req->active = 0;
 130 }
 131
 132 static SCSIDevice *vscsi_device_find(SCSIBus *bus, uint64_t srp_lun, int *lun)
 133 {
 134     int channel = 0, id = 0;
 135
 136 retry:
 137     switch (srp_lun >> 62) {
 138     case 0:
 139         if ((srp_lun >> 56) != 0) {
 140             channel = (srp_lun >> 56) & 0x3f;
 141             id = (srp_lun >> 48) & 0xff;
 142             srp_lun <<= 16;
 143             goto retry;
 144         }
 145         *lun = (srp_lun >> 48) & 0xff;
 146         break;
 147
 148     case 1:
 149         *lun = (srp_lun >> 48) & 0x3fff;
 150         break;
 151     case 2:
 152         channel = (srp_lun >> 53) & 0x7;
 153         id = (srp_lun >> 56) & 0x3f;
 154         *lun = (srp_lun >> 48) & 0x1f;
 155         break;
 156     case 3:
 157         *lun = -1;
 158         return NULL;
 159     default:
 160         abort();
 161     }
 162
 163     return scsi_device_find(bus, channel, id, *lun);
 164 }
 165
 166 static int vscsi_send_iu(VSCSIState *s, vscsi_req *req,
 167                          uint64_t length, uint8_t format)
 168 {
 169     long rc, rc1;
 170
 171     /* First copy the SRP */
 172     rc = spapr_tce_dma_write(&s->vdev, req->crq.s.IU_data_ptr,
 173                              &req->iu, length);
 174     if (rc) {
 175         fprintf(stderr, "vscsi_send_iu: DMA write failure !\n");
 176     }
 177
 178     req->crq.s.valid = 0x80;
 179     req->crq.s.format = format;
 180     req->crq.s.reserved = 0x00;
 181     req->crq.s.timeout = cpu_to_be16(0x0000);
 182     req->crq.s.IU_length = cpu_to_be16(length);
 183     req->crq.s.IU_data_ptr = req->iu.srp.rsp.tag; /* right byte order */
 184
 185     if (rc == 0) {
 186         req->crq.s.status = 0x99; /* Just needs to be non-zero */
 187     } else {
 188         req->crq.s.status = 0x00;
 189     }
 190
 191     rc1 = spapr_vio_send_crq(&s->vdev, req->crq.raw);
 192     if (rc1) {
 193         fprintf(stderr, "vscsi_send_iu: Error sending response\n");
 194         return rc1;
 195     }
 196
 197     return rc;
 198 }
 199
 200 static void vscsi_makeup_sense(VSCSIState *s, vscsi_req *req,
 201                                uint8_t key, uint8_t asc, uint8_t ascq)
 202 {
 203     req->senselen = SRP_RSP_SENSE_DATA_LEN;
 204
 205     /* Valid bit and 'current errors' */
 206     req->sense[0] = (0x1 << 7 | 0x70);
 207     /* Sense key */
 208     req->sense[2] = key;
 209     /* Additional sense length */
 210     req->sense[7] = 0xa; /* 10 bytes */
 211     /* Additional sense code */
 212     req->sense[12] = asc;
 213     req->sense[13] = ascq;
 214 }
 215
 216 static int vscsi_send_rsp(VSCSIState *s, vscsi_req *req,
 217                           uint8_t status, int32_t res_in, int32_t res_out)
 218 {
 219     union viosrp_iu *iu = &req->iu;
 220     uint64_t tag = iu->srp.rsp.tag;
 221     int total_len = sizeof(iu->srp.rsp);
 222
 223     dprintf("VSCSI: Sending resp status: 0x%x, "
 224             "res_in: %d, res_out: %d\n", status, res_in, res_out);
 225
 226     memset(iu, 0, sizeof(struct srp_rsp));
 227     iu->srp.rsp.opcode = SRP_RSP;
 228     iu->srp.rsp.req_lim_delta = cpu_to_be32(1);
 229     iu->srp.rsp.tag = tag;
 230
 231     /* Handle residuals */
 232     if (res_in < 0) {
 233         iu->srp.rsp.flags |= SRP_RSP_FLAG_DIUNDER;
 234         res_in = -res_in;
 235     } else if (res_in) {
 236         iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER;
 237     }
 238     if (res_out < 0) {
 239         iu->srp.rsp.flags |= SRP_RSP_FLAG_DOUNDER;
 240         res_out = -res_out;
 241     } else if (res_out) {
 242         iu->srp.rsp.flags |= SRP_RSP_FLAG_DOOVER;
 243     }
 244     iu->srp.rsp.data_in_res_cnt = cpu_to_be32(res_in);
 245     iu->srp.rsp.data_out_res_cnt = cpu_to_be32(res_out);
 246
 247     /* We don't do response data */
 248     /* iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID; */
 249     iu->srp.rsp.resp_data_len = cpu_to_be32(0);
 250
 251     /* Handle success vs. failure */
 252     iu->srp.rsp.status = status;
 253     if (status) {
 254         iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x04) >> 2;
 255         if (req->senselen) {
 256             req->iu.srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
 257             req->iu.srp.rsp.sense_data_len = cpu_to_be32(req->senselen);
 258             memcpy(req->iu.srp.rsp.data, req->sense, req->senselen);
 259             total_len += req->senselen;
 260         }
 261     } else {
 262         iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x02) >> 1;
 263     }
 264
 265     vscsi_send_iu(s, req, total_len, VIOSRP_SRP_FORMAT);
 266     return 0;
 267 }
 268
 269 static inline void vscsi_swap_desc(struct srp_direct_buf *desc)
 270 {
 271     desc->va = be64_to_cpu(desc->va);
 272     desc->len = be32_to_cpu(desc->len);
 273 }
 274
 275 static int vscsi_srp_direct_data(VSCSIState *s, vscsi_req *req,
 276                                  uint8_t *buf, uint32_t len)
 277 {
 278     struct srp_direct_buf *md = req->cur_desc;
 279     uint32_t llen;
 280     int rc = 0;
 281
 282     dprintf("VSCSI: direct segment 0x%x bytes, va=0x%llx desc len=0x%x\n",
 283             len, (unsigned long long)md->va, md->len);
 284
 285     llen = MIN(len, md->len);
 286     if (llen) {
 287         if (req->writing) { /* writing = to device = reading from memory */
 288             rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen);
 289         } else {
 290             rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen);
 291         }
 292     }
 293     md->len -= llen;
 294     md->va += llen;
 295
 296     if (rc) {
 297         return -1;
 298     }
 299     return llen;
 300 }
 301
 302 static int vscsi_srp_indirect_data(VSCSIState *s, vscsi_req *req,
 303                                    uint8_t *buf, uint32_t len)
 304 {
 305     struct srp_direct_buf *td = &req->ind_desc->table_desc;
 306     struct srp_direct_buf *md = req->cur_desc;
 307     int rc = 0;
 308     uint32_t llen, total = 0;
 309
 310     dprintf("VSCSI: indirect segment 0x%x bytes, td va=0x%llx len=0x%x\n",
 311             len, (unsigned long long)td->va, td->len);
 312
 313     /* While we have data ... */
 314     while (len) {
 315         /* If we have a descriptor but it's empty, go fetch a new one */
 316         if (md && md->len == 0) {
 317             /* More local available, use one */
 318             if (req->local_desc) {
 319                 md = ++req->cur_desc;
 320                 --req->local_desc;
 321                 --req->total_desc;
 322                 td->va += sizeof(struct srp_direct_buf);
 323             } else {
 324                 md = req->cur_desc = NULL;
 325             }
 326         }
 327         /* No descriptor at hand, fetch one */
 328         if (!md) {
 329             if (!req->total_desc) {
 330                 dprintf("VSCSI:   Out of descriptors !\n");
 331                 break;
 332             }
 333             md = req->cur_desc = &req->ext_desc;
 334             dprintf("VSCSI:   Reading desc from 0x%llx\n",
 335                     (unsigned long long)td->va);
 336             rc = spapr_tce_dma_read(&s->vdev, td->va, md,
 337                                     sizeof(struct srp_direct_buf));
 338             if (rc) {
 339                 dprintf("VSCSI: tce_dma_read -> %d reading ext_desc\n", rc);
 340                 break;
 341             }
 342             vscsi_swap_desc(md);
 343             td->va += sizeof(struct srp_direct_buf);
 344             --req->total_desc;
 345         }
 346         dprintf("VSCSI:   [desc va=0x%llx,len=0x%x] remaining=0x%x\n",
 347                 (unsigned long long)md->va, md->len, len);
 348
 349         /* Perform transfer */
 350         llen = MIN(len, md->len);
 351         if (req->writing) { /* writing = to device = reading from memory */
 352             rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen);
 353         } else {
 354             rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen);
 355         }
 356         if (rc) {
 357             dprintf("VSCSI: tce_dma_r/w(%d) -> %d\n", req->writing, rc);
 358             break;
 359         }
 360         dprintf("VSCSI:     data: %02x %02x %02x %02x...\n",
 361                 buf[0], buf[1], buf[2], buf[3]);
 362
 363         len -= llen;
 364         buf += llen;
 365         total += llen;
 366         md->va += llen;
 367         md->len -= llen;
 368     }
 369     return rc ? -1 : total;
 370 }
 371
 372 static int vscsi_srp_transfer_data(VSCSIState *s, vscsi_req *req,
 373                                    int writing, uint8_t *buf, uint32_t len)
 374 {
 375     int err = 0;
 376
 377     switch (req->dma_fmt) {
 378     case SRP_NO_DATA_DESC:
 379         dprintf("VSCSI: no data desc transfer, skipping 0x%x bytes\n", len);
 380         break;
 381     case SRP_DATA_DESC_DIRECT:
 382         err = vscsi_srp_direct_data(s, req, buf, len);
 383         break;
 384     case SRP_DATA_DESC_INDIRECT:
 385         err = vscsi_srp_indirect_data(s, req, buf, len);
 386         break;
 387     }
 388     return err;
 389 }
 390
 391 /* Bits from linux srp */
 392 static int data_out_desc_size(struct srp_cmd *cmd)
 393 {
 394     int size = 0;
 395     uint8_t fmt = cmd->buf_fmt >> 4;
 396
 397     switch (fmt) {
 398     case SRP_NO_DATA_DESC:
 399         break;
 400     case SRP_DATA_DESC_DIRECT:
 401         size = sizeof(struct srp_direct_buf);
 402         break;
 403     case SRP_DATA_DESC_INDIRECT:
 404         size = sizeof(struct srp_indirect_buf) +
 405             sizeof(struct srp_direct_buf)*cmd->data_out_desc_cnt;
 406         break;
 407     default:
 408         break;
 409     }
 410     return size;
 411 }
 412
 413 static int vscsi_preprocess_desc(vscsi_req *req)
 414 {
 415     struct srp_cmd *cmd = &req->iu.srp.cmd;
 416     int offset, i;
 417
 418     offset = cmd->add_cdb_len & ~3;
 419
 420     if (req->writing) {
 421         req->dma_fmt = cmd->buf_fmt >> 4;
 422     } else {
 423         offset += data_out_desc_size(cmd);
 424         req->dma_fmt = cmd->buf_fmt & ((1U << 4) - 1);
 425     }
 426
 427     switch (req->dma_fmt) {
 428     case SRP_NO_DATA_DESC:
 429         break;
 430     case SRP_DATA_DESC_DIRECT:
 431         req->cur_desc = (struct srp_direct_buf *)(cmd->add_data + offset);
 432         req->total_desc = req->local_desc = 1;
 433         vscsi_swap_desc(req->cur_desc);
 434         dprintf("VSCSI: using direct RDMA %s, 0x%x bytes MD: 0x%llx\n",
 435                 req->writing ? "write" : "read",
 436                 req->cur_desc->len, (unsigned long long)req->cur_desc->va);
 437         break;
 438     case SRP_DATA_DESC_INDIRECT:
 439         req->ind_desc = (struct srp_indirect_buf *)(cmd->add_data + offset);
 440         vscsi_swap_desc(&req->ind_desc->table_desc);
 441         req->total_desc = req->ind_desc->table_desc.len /
 442             sizeof(struct srp_direct_buf);
 443         req->local_desc = req->writing ? cmd->data_out_desc_cnt :
 444             cmd->data_in_desc_cnt;
 445         for (i = 0; i < req->local_desc; i++) {
 446             vscsi_swap_desc(&req->ind_desc->desc_list[i]);
 447         }
 448         req->cur_desc = req->local_desc ? &req->ind_desc->desc_list[0] : NULL;
 449         dprintf("VSCSI: using indirect RDMA %s, 0x%x bytes %d descs "
 450                 "(%d local) VA: 0x%llx\n",
 451                 req->writing ? "read" : "write",
 452                 be32_to_cpu(req->ind_desc->len),
 453                 req->total_desc, req->local_desc,
 454                 (unsigned long long)req->ind_desc->table_desc.va);
 455         break;
 456     default:
 457         fprintf(stderr,
 458                 "vscsi_preprocess_desc: Unknown format %x\n", req->dma_fmt);
 459         return -1;
 460     }
 461
 462     return 0;
 463 }
 464
 465 /* Callback to indicate that the SCSI layer has completed a transfer.  */
 466 static void vscsi_transfer_data(SCSIRequest *sreq, uint32_t len)
 467 {
 468     VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent);
 469     vscsi_req *req = sreq->hba_private;
 470     uint8_t *buf;
 471     int rc = 0;
 472
 473     dprintf("VSCSI: SCSI xfer complete tag=0x%x len=0x%x, req=%p\n",
 474             sreq->tag, len, req);
 475     if (req == NULL) {
 476         fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
 477         return;
 478     }
 479
 480     if (len) {
 481         buf = scsi_req_get_buf(sreq);
 482         rc = vscsi_srp_transfer_data(s, req, req->writing, buf, len);
 483     }
 484     if (rc < 0) {
 485         fprintf(stderr, "VSCSI: RDMA error rc=%d!\n", rc);
 486         vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
 487         scsi_req_abort(req->sreq, CHECK_CONDITION);
 488         return;
 489     }
 490
 491     /* Start next chunk */
 492     req->data_len -= rc;
 493     scsi_req_continue(sreq);
 494 }
 495
 496 /* Callback to indicate that the SCSI layer has completed a transfer.  */
 497 static void vscsi_command_complete(SCSIRequest *sreq, uint32_t status)
 498 {
 499     VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent);
 500     vscsi_req *req = sreq->hba_private;
 501     int32_t res_in = 0, res_out = 0;
 502
 503     dprintf("VSCSI: SCSI cmd complete, r=0x%x tag=0x%x status=0x%x, req=%p\n",
 504             reason, sreq->tag, status, req);
 505     if (req == NULL) {
 506         fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
 507         return;
 508     }
 509
 510     if (status == CHECK_CONDITION) {
 511         req->senselen = scsi_req_get_sense(req->sreq, req->sense,
 512                                            sizeof(req->sense));
 513         dprintf("VSCSI: Sense data, %d bytes:\n", len);
 514         dprintf("       %02x  %02x  %02x  %02x  %02x  %02x  %02x  %02x\n",
 515                 req->sense[0], req->sense[1], req->sense[2], req->sense[3],
 516                 req->sense[4], req->sense[5], req->sense[6], req->sense[7]);
 517         dprintf("       %02x  %02x  %02x  %02x  %02x  %02x  %02x  %02x\n",
 518                 req->sense[8], req->sense[9], req->sense[10], req->sense[11],
 519                 req->sense[12], req->sense[13], req->sense[14], req->sense[15]);
 520     }
 521
 522     dprintf("VSCSI: Command complete err=%d\n", status);
 523     if (status == 0) {
 524         /* We handle overflows, not underflows for normal commands,
 525          * but hopefully nobody cares
 526          */
 527         if (req->writing) {
 528             res_out = req->data_len;
 529         } else {
 530             res_in = req->data_len;
 531         }
 532     }
 533     vscsi_send_rsp(s, req, status, res_in, res_out);
 534     vscsi_put_req(req);
 535 }
 536
 537 static void vscsi_request_cancelled(SCSIRequest *sreq)
 538 {
 539     vscsi_req *req = sreq->hba_private;
 540
 541     vscsi_put_req(req);
 542 }
 543
 544 static void vscsi_process_login(VSCSIState *s, vscsi_req *req)
 545 {
 546     union viosrp_iu *iu = &req->iu;
 547     struct srp_login_rsp *rsp = &iu->srp.login_rsp;
 548     uint64_t tag = iu->srp.rsp.tag;
 549
 550     dprintf("VSCSI: Got login, sendin response !\n");
 551
 552     /* TODO handle case that requested size is wrong and
 553      * buffer format is wrong
 554      */
 555     memset(iu, 0, sizeof(struct srp_login_rsp));
 556     rsp->opcode = SRP_LOGIN_RSP;
 557     /* Don't advertise quite as many request as we support to
 558      * keep room for management stuff etc...
 559      */
 560     rsp->req_lim_delta = cpu_to_be32(VSCSI_REQ_LIMIT-2);
 561     rsp->tag = tag;
 562     rsp->max_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
 563     rsp->max_ti_iu_len = cpu_to_be32(sizeof(union srp_iu));
 564     /* direct and indirect */
 565     rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT);
 566
 567     vscsi_send_iu(s, req, sizeof(*rsp), VIOSRP_SRP_FORMAT);
 568 }
 569
 570 static void vscsi_inquiry_no_target(VSCSIState *s, vscsi_req *req)
 571 {
 572     uint8_t *cdb = req->iu.srp.cmd.cdb;
 573     uint8_t resp_data[36];
 574     int rc, len, alen;
 575
 576     /* We dont do EVPD. Also check that page_code is 0 */
 577     if ((cdb[1] & 0x01) || (cdb[1] & 0x01) || cdb[2] != 0) {
 578         /* Send INVALID FIELD IN CDB */
 579         vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0);
 580         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
 581         return;
 582     }
 583     alen = cdb[3];
 584     alen = (alen << 8) | cdb[4];
 585     len = MIN(alen, 36);
 586
 587     /* Fake up inquiry using PQ=3 */
 588     memset(resp_data, 0, 36);
 589     resp_data[0] = 0x7f;   /* Not capable of supporting a device here */
 590     resp_data[2] = 0x06;   /* SPS-4 */
 591     resp_data[3] = 0x02;   /* Resp data format */
 592     resp_data[4] = 36 - 5; /* Additional length */
 593     resp_data[7] = 0x10;   /* Sync transfers */
 594     memcpy(&resp_data[16], "QEMU EMPTY      ", 16);
 595     memcpy(&resp_data[8], "QEMU    ", 8);
 596
 597     req->writing = 0;
 598     vscsi_preprocess_desc(req);
 599     rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len);
 600     if (rc < 0) {
 601         vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
 602         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
 603     } else {
 604         vscsi_send_rsp(s, req, 0, 36 - rc, 0);
 605     }
 606 }
 607
 608 static int vscsi_queue_cmd(VSCSIState *s, vscsi_req *req)
 609 {
 610     union srp_iu *srp = &req->iu.srp;
 611     SCSIDevice *sdev;
 612     int n, lun;
 613
 614     sdev = vscsi_device_find(&s->bus, be64_to_cpu(srp->cmd.lun), &lun);
 615     if (!sdev) {
 616         dprintf("VSCSI: Command for lun %08" PRIx64 " with no drive\n", be64_to_cpu(srp->cmd.lun));
 617         if (srp->cmd.cdb[0] == INQUIRY) {
 618             vscsi_inquiry_no_target(s, req);
 619         } else {
 620             vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0x00);
 621             vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
 622         } return 1;
 623     }
 624
 625     req->lun = lun;
 626     req->sreq = scsi_req_new(sdev, req->qtag, lun, srp->cmd.cdb, req);
 627     n = scsi_req_enqueue(req->sreq);
 628
 629     dprintf("VSCSI: Queued command tag 0x%x CMD 0x%x ID %d LUN %d ret: %d\n",
 630             req->qtag, srp->cmd.cdb[0], id, lun, n);
 631
 632     if (n) {
 633         /* Transfer direction must be set before preprocessing the
 634          * descriptors
 635          */
 636         req->writing = (n < 1);
 637
 638         /* Preprocess RDMA descriptors */
 639         vscsi_preprocess_desc(req);
 640
 641         /* Get transfer direction and initiate transfer */
 642         if (n > 0) {
 643             req->data_len = n;
 644         } else if (n < 0) {
 645             req->data_len = -n;
 646         }
 647         scsi_req_continue(req->sreq);
 648     }
 649     /* Don't touch req here, it may have been recycled already */
 650
 651     return 0;
 652 }
 653
 654 static int vscsi_process_tsk_mgmt(VSCSIState *s, vscsi_req *req)
 655 {
 656     union viosrp_iu *iu = &req->iu;
 657     int fn;
 658
 659     fprintf(stderr, "vscsi_process_tsk_mgmt %02x\n",
 660             iu->srp.tsk_mgmt.tsk_mgmt_func);
 661
 662     switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
 663 #if 0 /* We really don't deal with these for now */
 664     case SRP_TSK_ABORT_TASK:
 665         fn = ABORT_TASK;
 666         break;
 667     case SRP_TSK_ABORT_TASK_SET:
 668         fn = ABORT_TASK_SET;
 669         break;
 670     case SRP_TSK_CLEAR_TASK_SET:
 671         fn = CLEAR_TASK_SET;
 672         break;
 673     case SRP_TSK_LUN_RESET:
 674         fn = LOGICAL_UNIT_RESET;
 675         break;
 676     case SRP_TSK_CLEAR_ACA:
 677         fn = CLEAR_ACA;
 678         break;
 679 #endif
 680     default:
 681         fn = 0;
 682     }
 683     if (fn) {
 684         /* XXX Send/Handle target task management */
 685         ;
 686     } else {
 687         vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x20, 0);
 688         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
 689     }
 690     return !fn;
 691 }
 692
 693 static int vscsi_handle_srp_req(VSCSIState *s, vscsi_req *req)
 694 {
 695     union srp_iu *srp = &req->iu.srp;
 696     int done = 1;
 697     uint8_t opcode = srp->rsp.opcode;
 698
 699     switch (opcode) {
 700     case SRP_LOGIN_REQ:
 701         vscsi_process_login(s, req);
 702         break;
 703     case SRP_TSK_MGMT:
 704         done = vscsi_process_tsk_mgmt(s, req);
 705         break;
 706     case SRP_CMD:
 707         done = vscsi_queue_cmd(s, req);
 708         break;
 709     case SRP_LOGIN_RSP:
 710     case SRP_I_LOGOUT:
 711     case SRP_T_LOGOUT:
 712     case SRP_RSP:
 713     case SRP_CRED_REQ:
 714     case SRP_CRED_RSP:
 715     case SRP_AER_REQ:
 716     case SRP_AER_RSP:
 717         fprintf(stderr, "VSCSI: Unsupported opcode %02x\n", opcode);
 718         break;
 719     default:
 720         fprintf(stderr, "VSCSI: Unknown type %02x\n", opcode);
 721     }
 722
 723     return done;
 724 }
 725
 726 static int vscsi_send_adapter_info(VSCSIState *s, vscsi_req *req)
 727 {
 728     struct viosrp_adapter_info *sinfo;
 729     struct mad_adapter_info_data info;
 730     int rc;
 731
 732     sinfo = &req->iu.mad.adapter_info;
 733
 734 #if 0 /* What for ? */
 735     rc = spapr_tce_dma_read(&s->vdev, be64_to_cpu(sinfo->buffer),
 736                             &info, be16_to_cpu(sinfo->common.length));
 737     if (rc) {
 738         fprintf(stderr, "vscsi_send_adapter_info: DMA read failure !\n");
 739     }
 740 #endif
 741     memset(&info, 0, sizeof(info));
 742     strcpy(info.srp_version, SRP_VERSION);
 743     strncpy(info.partition_name, "qemu", sizeof("qemu"));
 744     info.partition_number = cpu_to_be32(0);
 745     info.mad_version = cpu_to_be32(1);
 746     info.os_type = cpu_to_be32(2);
 747     info.port_max_txu[0] = cpu_to_be32(VSCSI_MAX_SECTORS << 9);
 748
 749     rc = spapr_tce_dma_write(&s->vdev, be64_to_cpu(sinfo->buffer),
 750                              &info, be16_to_cpu(sinfo->common.length));
 751     if (rc)  {
 752         fprintf(stderr, "vscsi_send_adapter_info: DMA write failure !\n");
 753     }
 754
 755     sinfo->common.status = rc ? cpu_to_be32(1) : 0;
 756
 757     return vscsi_send_iu(s, req, sizeof(*sinfo), VIOSRP_MAD_FORMAT);
 758 }
 759
 760 static int vscsi_handle_mad_req(VSCSIState *s, vscsi_req *req)
 761 {
 762     union mad_iu *mad = &req->iu.mad;
 763
 764     switch (be32_to_cpu(mad->empty_iu.common.type)) {
 765     case VIOSRP_EMPTY_IU_TYPE:
 766         fprintf(stderr, "Unsupported EMPTY MAD IU\n");
 767         break;
 768     case VIOSRP_ERROR_LOG_TYPE:
 769         fprintf(stderr, "Unsupported ERROR LOG MAD IU\n");
 770         mad->error_log.common.status = cpu_to_be16(1);
 771         vscsi_send_iu(s, req, sizeof(mad->error_log), VIOSRP_MAD_FORMAT);
 772         break;
 773     case VIOSRP_ADAPTER_INFO_TYPE:
 774         vscsi_send_adapter_info(s, req);
 775         break;
 776     case VIOSRP_HOST_CONFIG_TYPE:
 777         mad->host_config.common.status = cpu_to_be16(1);
 778         vscsi_send_iu(s, req, sizeof(mad->host_config), VIOSRP_MAD_FORMAT);
 779         break;
 780     default:
 781         fprintf(stderr, "VSCSI: Unknown MAD type %02x\n",
 782                 be32_to_cpu(mad->empty_iu.common.type));
 783     }
 784
 785     return 1;
 786 }
 787
 788 static void vscsi_got_payload(VSCSIState *s, vscsi_crq *crq)
 789 {
 790     vscsi_req *req;
 791     int done;
 792
 793     req = vscsi_get_req(s);
 794     if (req == NULL) {
 795         fprintf(stderr, "VSCSI: Failed to get a request !\n");
 796         return;
 797     }
 798
 799     /* We only support a limited number of descriptors, we know
 800      * the ibmvscsi driver uses up to 10 max, so it should fit
 801      * in our 256 bytes IUs. If not we'll have to increase the size
 802      * of the structure.
 803      */
 804     if (crq->s.IU_length > sizeof(union viosrp_iu)) {
 805         fprintf(stderr, "VSCSI: SRP IU too long (%d bytes) !\n",
 806                 crq->s.IU_length);
 807         return;
 808     }
 809
 810     /* XXX Handle failure differently ? */
 811     if (spapr_tce_dma_read(&s->vdev, crq->s.IU_data_ptr, &req->iu,
 812                            crq->s.IU_length)) {
 813         fprintf(stderr, "vscsi_got_payload: DMA read failure !\n");
 814         g_free(req);
 815     }
 816     memcpy(&req->crq, crq, sizeof(vscsi_crq));
 817
 818     if (crq->s.format == VIOSRP_MAD_FORMAT) {
 819         done = vscsi_handle_mad_req(s, req);
 820     } else {
 821         done = vscsi_handle_srp_req(s, req);
 822     }
 823
 824     if (done) {
 825         vscsi_put_req(req);
 826     }
 827 }
 828
 829
 830 static int vscsi_do_crq(struct VIOsPAPRDevice *dev, uint8_t *crq_data)
 831 {
 832     VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
 833     vscsi_crq crq;
 834
 835     memcpy(crq.raw, crq_data, 16);
 836     crq.s.timeout = be16_to_cpu(crq.s.timeout);
 837     crq.s.IU_length = be16_to_cpu(crq.s.IU_length);
 838     crq.s.IU_data_ptr = be64_to_cpu(crq.s.IU_data_ptr);
 839
 840     dprintf("VSCSI: do_crq %02x %02x ...\n", crq.raw[0], crq.raw[1]);
 841
 842     switch (crq.s.valid) {
 843     case 0xc0: /* Init command/response */
 844
 845         /* Respond to initialization request */
 846         if (crq.s.format == 0x01) {
 847             memset(crq.raw, 0, 16);
 848             crq.s.valid = 0xc0;
 849             crq.s.format = 0x02;
 850             spapr_vio_send_crq(dev, crq.raw);
 851         }
 852
 853         /* Note that in hotplug cases, we might get a 0x02
 854          * as a result of us emitting the init request
 855          */
 856
 857         break;
 858     case 0xff: /* Link event */
 859
 860         /* Not handled for now */
 861
 862         break;
 863     case 0x80: /* Payloads */
 864         switch (crq.s.format) {
 865         case VIOSRP_SRP_FORMAT: /* AKA VSCSI request */
 866         case VIOSRP_MAD_FORMAT: /* AKA VSCSI response */
 867             vscsi_got_payload(s, &crq);
 868             break;
 869         case VIOSRP_OS400_FORMAT:
 870         case VIOSRP_AIX_FORMAT:
 871         case VIOSRP_LINUX_FORMAT:
 872         case VIOSRP_INLINE_FORMAT:
 873             fprintf(stderr, "vscsi_do_srq: Unsupported payload format %02x\n",
 874                     crq.s.format);
 875             break;
 876         default:
 877             fprintf(stderr, "vscsi_do_srq: Unknown payload format %02x\n",
 878                     crq.s.format);
 879         }
 880         break;
 881     default:
 882         fprintf(stderr, "vscsi_do_crq: unknown CRQ %02x %02x ...\n",
 883                 crq.raw[0], crq.raw[1]);
 884     };
 885
 886     return 0;
 887 }
 888
 889 static const struct SCSIBusInfo vscsi_scsi_info = {
 890     .tcq = true,
 891     .max_channel = 7, /* logical unit addressing format */
 892     .max_target = 63,
 893     .max_lun = 31,
 894
 895     .transfer_data = vscsi_transfer_data,
 896     .complete = vscsi_command_complete,
 897     .cancel = vscsi_request_cancelled
 898 };
 899
 900 static int spapr_vscsi_init(VIOsPAPRDevice *dev)
 901 {
 902     VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
 903     int i;
 904
 905     dbg_vscsi_state = s;
 906
 907     /* Initialize qemu request tags */
 908     memset(s->reqs, 0, sizeof(s->reqs));
 909     for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
 910         s->reqs[i].qtag = i;
 911     }
 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, uint32_t reg)
 924 {
 925     DeviceState *dev;
 926
 927     dev = qdev_create(&bus->bus, "spapr-vscsi");
 928     qdev_prop_set_uint32(dev, "reg", reg);
 929
 930     qdev_init_nofail(dev);
 931 }
 932
 933 static int spapr_vscsi_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
 934 {
 935     int ret;
 936
 937     ret = fdt_setprop_cell(fdt, node_off, "#address-cells", 2);
 938     if (ret < 0) {
 939         return ret;
 940     }
 941
 942     ret = fdt_setprop_cell(fdt, node_off, "#size-cells", 0);
 943     if (ret < 0) {
 944         return ret;
 945     }
 946
 947     return 0;
 948 }
 949
 950 static VIOsPAPRDeviceInfo spapr_vscsi = {
 951     .init = spapr_vscsi_init,
 952     .devnode = spapr_vscsi_devnode,
 953     .dt_name = "v-scsi",
 954     .dt_type = "vscsi",
 955     .dt_compatible = "IBM,v-scsi",
 956     .signal_mask = 0x00000001,
 957     .qdev.name = "spapr-vscsi",
 958     .qdev.size = sizeof(VSCSIState),
 959     .qdev.props = (Property[]) {
 960         DEFINE_SPAPR_PROPERTIES(VSCSIState, vdev, 0x2000, 0x10000000),
 961         DEFINE_PROP_END_OF_LIST(),
 962     },
 963 };
 964
 965 static void spapr_vscsi_register(void)
 966 {
 967     spapr_vio_bus_register_withprop(&spapr_vscsi);
 968 }
 969 device_init(spapr_vscsi_register);