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