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 void vscsi_decode_id_lun(uint64_t srp_lun, int *id, int *lun)
 133 {
 134     /* XXX Figure that one out properly ! This is crackpot */
 135     *id = (srp_lun >> 56) & 0x7f;
 136     *lun = (srp_lun >> 48) & 0xff;
 137 }
 138
 139 static int vscsi_send_iu(VSCSIState *s, vscsi_req *req,
 140                          uint64_t length, uint8_t format)
 141 {
 142     long rc, rc1;
 143
 144     /* First copy the SRP */
 145     rc = spapr_tce_dma_write(&s->vdev, req->crq.s.IU_data_ptr,
 146                              &req->iu, length);
 147     if (rc) {
 148         fprintf(stderr, "vscsi_send_iu: DMA write failure !\n");
 149     }
 150
 151     req->crq.s.valid = 0x80;
 152     req->crq.s.format = format;
 153     req->crq.s.reserved = 0x00;
 154     req->crq.s.timeout = cpu_to_be16(0x0000);
 155     req->crq.s.IU_length = cpu_to_be16(length);
 156     req->crq.s.IU_data_ptr = req->iu.srp.rsp.tag; /* right byte order */
 157
 158     if (rc == 0) {
 159         req->crq.s.status = 0x99; /* Just needs to be non-zero */
 160     } else {
 161         req->crq.s.status = 0x00;
 162     }
 163
 164     rc1 = spapr_vio_send_crq(&s->vdev, req->crq.raw);
 165     if (rc1) {
 166         fprintf(stderr, "vscsi_send_iu: Error sending response\n");
 167         return rc1;
 168     }
 169
 170     return rc;
 171 }
 172
 173 static void vscsi_makeup_sense(VSCSIState *s, vscsi_req *req,
 174                                uint8_t key, uint8_t asc, uint8_t ascq)
 175 {
 176     req->senselen = SRP_RSP_SENSE_DATA_LEN;
 177
 178     /* Valid bit and 'current errors' */
 179     req->sense[0] = (0x1 << 7 | 0x70);
 180     /* Sense key */
 181     req->sense[2] = key;
 182     /* Additional sense length */
 183     req->sense[7] = 0xa; /* 10 bytes */
 184     /* Additional sense code */
 185     req->sense[12] = asc;
 186     req->sense[13] = ascq;
 187 }
 188
 189 static int vscsi_send_rsp(VSCSIState *s, vscsi_req *req,
 190                           uint8_t status, int32_t res_in, int32_t res_out)
 191 {
 192     union viosrp_iu *iu = &req->iu;
 193     uint64_t tag = iu->srp.rsp.tag;
 194     int total_len = sizeof(iu->srp.rsp);
 195
 196     dprintf("VSCSI: Sending resp status: 0x%x, "
 197             "res_in: %d, res_out: %d\n", status, res_in, res_out);
 198
 199     memset(iu, 0, sizeof(struct srp_rsp));
 200     iu->srp.rsp.opcode = SRP_RSP;
 201     iu->srp.rsp.req_lim_delta = cpu_to_be32(1);
 202     iu->srp.rsp.tag = tag;
 203
 204     /* Handle residuals */
 205     if (res_in < 0) {
 206         iu->srp.rsp.flags |= SRP_RSP_FLAG_DIUNDER;
 207         res_in = -res_in;
 208     } else if (res_in) {
 209         iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER;
 210     }
 211     if (res_out < 0) {
 212         iu->srp.rsp.flags |= SRP_RSP_FLAG_DOUNDER;
 213         res_out = -res_out;
 214     } else if (res_out) {
 215         iu->srp.rsp.flags |= SRP_RSP_FLAG_DOOVER;
 216     }
 217     iu->srp.rsp.data_in_res_cnt = cpu_to_be32(res_in);
 218     iu->srp.rsp.data_out_res_cnt = cpu_to_be32(res_out);
 219
 220     /* We don't do response data */
 221     /* iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID; */
 222     iu->srp.rsp.resp_data_len = cpu_to_be32(0);
 223
 224     /* Handle success vs. failure */
 225     iu->srp.rsp.status = status;
 226     if (status) {
 227         iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x04) >> 2;
 228         if (req->senselen) {
 229             req->iu.srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
 230             req->iu.srp.rsp.sense_data_len = cpu_to_be32(req->senselen);
 231             memcpy(req->iu.srp.rsp.data, req->sense, req->senselen);
 232             total_len += req->senselen;
 233         }
 234     } else {
 235         iu->srp.rsp.sol_not = (iu->srp.cmd.sol_not & 0x02) >> 1;
 236     }
 237
 238     vscsi_send_iu(s, req, total_len, VIOSRP_SRP_FORMAT);
 239     return 0;
 240 }
 241
 242 static inline void vscsi_swap_desc(struct srp_direct_buf *desc)
 243 {
 244     desc->va = be64_to_cpu(desc->va);
 245     desc->len = be32_to_cpu(desc->len);
 246 }
 247
 248 static int vscsi_srp_direct_data(VSCSIState *s, vscsi_req *req,
 249                                  uint8_t *buf, uint32_t len)
 250 {
 251     struct srp_direct_buf *md = req->cur_desc;
 252     uint32_t llen;
 253     int rc = 0;
 254
 255     dprintf("VSCSI: direct segment 0x%x bytes, va=0x%llx desc len=0x%x\n",
 256             len, (unsigned long long)md->va, md->len);
 257
 258     llen = MIN(len, md->len);
 259     if (llen) {
 260         if (req->writing) { /* writing = to device = reading from memory */
 261             rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen);
 262         } else {
 263             rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen);
 264         }
 265     }
 266     md->len -= llen;
 267     md->va += llen;
 268
 269     if (rc) {
 270         return -1;
 271     }
 272     return llen;
 273 }
 274
 275 static int vscsi_srp_indirect_data(VSCSIState *s, vscsi_req *req,
 276                                    uint8_t *buf, uint32_t len)
 277 {
 278     struct srp_direct_buf *td = &req->ind_desc->table_desc;
 279     struct srp_direct_buf *md = req->cur_desc;
 280     int rc = 0;
 281     uint32_t llen, total = 0;
 282
 283     dprintf("VSCSI: indirect segment 0x%x bytes, td va=0x%llx len=0x%x\n",
 284             len, (unsigned long long)td->va, td->len);
 285
 286     /* While we have data ... */
 287     while (len) {
 288         /* If we have a descriptor but it's empty, go fetch a new one */
 289         if (md && md->len == 0) {
 290             /* More local available, use one */
 291             if (req->local_desc) {
 292                 md = ++req->cur_desc;
 293                 --req->local_desc;
 294                 --req->total_desc;
 295                 td->va += sizeof(struct srp_direct_buf);
 296             } else {
 297                 md = req->cur_desc = NULL;
 298             }
 299         }
 300         /* No descriptor at hand, fetch one */
 301         if (!md) {
 302             if (!req->total_desc) {
 303                 dprintf("VSCSI:   Out of descriptors !\n");
 304                 break;
 305             }
 306             md = req->cur_desc = &req->ext_desc;
 307             dprintf("VSCSI:   Reading desc from 0x%llx\n",
 308                     (unsigned long long)td->va);
 309             rc = spapr_tce_dma_read(&s->vdev, td->va, md,
 310                                     sizeof(struct srp_direct_buf));
 311             if (rc) {
 312                 dprintf("VSCSI: tce_dma_read -> %d reading ext_desc\n", rc);
 313                 break;
 314             }
 315             vscsi_swap_desc(md);
 316             td->va += sizeof(struct srp_direct_buf);
 317             --req->total_desc;
 318         }
 319         dprintf("VSCSI:   [desc va=0x%llx,len=0x%x] remaining=0x%x\n",
 320                 (unsigned long long)md->va, md->len, len);
 321
 322         /* Perform transfer */
 323         llen = MIN(len, md->len);
 324         if (req->writing) { /* writing = to device = reading from memory */
 325             rc = spapr_tce_dma_read(&s->vdev, md->va, buf, llen);
 326         } else {
 327             rc = spapr_tce_dma_write(&s->vdev, md->va, buf, llen);
 328         }
 329         if (rc) {
 330             dprintf("VSCSI: tce_dma_r/w(%d) -> %d\n", req->writing, rc);
 331             break;
 332         }
 333         dprintf("VSCSI:     data: %02x %02x %02x %02x...\n",
 334                 buf[0], buf[1], buf[2], buf[3]);
 335
 336         len -= llen;
 337         buf += llen;
 338         total += llen;
 339         md->va += llen;
 340         md->len -= llen;
 341     }
 342     return rc ? -1 : total;
 343 }
 344
 345 static int vscsi_srp_transfer_data(VSCSIState *s, vscsi_req *req,
 346                                    int writing, uint8_t *buf, uint32_t len)
 347 {
 348     int err = 0;
 349
 350     switch (req->dma_fmt) {
 351     case SRP_NO_DATA_DESC:
 352         dprintf("VSCSI: no data desc transfer, skipping 0x%x bytes\n", len);
 353         break;
 354     case SRP_DATA_DESC_DIRECT:
 355         err = vscsi_srp_direct_data(s, req, buf, len);
 356         break;
 357     case SRP_DATA_DESC_INDIRECT:
 358         err = vscsi_srp_indirect_data(s, req, buf, len);
 359         break;
 360     }
 361     return err;
 362 }
 363
 364 /* Bits from linux srp */
 365 static int data_out_desc_size(struct srp_cmd *cmd)
 366 {
 367     int size = 0;
 368     uint8_t fmt = cmd->buf_fmt >> 4;
 369
 370     switch (fmt) {
 371     case SRP_NO_DATA_DESC:
 372         break;
 373     case SRP_DATA_DESC_DIRECT:
 374         size = sizeof(struct srp_direct_buf);
 375         break;
 376     case SRP_DATA_DESC_INDIRECT:
 377         size = sizeof(struct srp_indirect_buf) +
 378             sizeof(struct srp_direct_buf)*cmd->data_out_desc_cnt;
 379         break;
 380     default:
 381         break;
 382     }
 383     return size;
 384 }
 385
 386 static int vscsi_preprocess_desc(vscsi_req *req)
 387 {
 388     struct srp_cmd *cmd = &req->iu.srp.cmd;
 389     int offset, i;
 390
 391     offset = cmd->add_cdb_len & ~3;
 392
 393     if (req->writing) {
 394         req->dma_fmt = cmd->buf_fmt >> 4;
 395     } else {
 396         offset += data_out_desc_size(cmd);
 397         req->dma_fmt = cmd->buf_fmt & ((1U << 4) - 1);
 398     }
 399
 400     switch (req->dma_fmt) {
 401     case SRP_NO_DATA_DESC:
 402         break;
 403     case SRP_DATA_DESC_DIRECT:
 404         req->cur_desc = (struct srp_direct_buf *)(cmd->add_data + offset);
 405         req->total_desc = req->local_desc = 1;
 406         vscsi_swap_desc(req->cur_desc);
 407         dprintf("VSCSI: using direct RDMA %s, 0x%x bytes MD: 0x%llx\n",
 408                 req->writing ? "write" : "read",
 409                 req->cur_desc->len, (unsigned long long)req->cur_desc->va);
 410         break;
 411     case SRP_DATA_DESC_INDIRECT:
 412         req->ind_desc = (struct srp_indirect_buf *)(cmd->add_data + offset);
 413         vscsi_swap_desc(&req->ind_desc->table_desc);
 414         req->total_desc = req->ind_desc->table_desc.len /
 415             sizeof(struct srp_direct_buf);
 416         req->local_desc = req->writing ? cmd->data_out_desc_cnt :
 417             cmd->data_in_desc_cnt;
 418         for (i = 0; i < req->local_desc; i++) {
 419             vscsi_swap_desc(&req->ind_desc->desc_list[i]);
 420         }
 421         req->cur_desc = req->local_desc ? &req->ind_desc->desc_list[0] : NULL;
 422         dprintf("VSCSI: using indirect RDMA %s, 0x%x bytes %d descs "
 423                 "(%d local) VA: 0x%llx\n",
 424                 req->writing ? "read" : "write",
 425                 be32_to_cpu(req->ind_desc->len),
 426                 req->total_desc, req->local_desc,
 427                 (unsigned long long)req->ind_desc->table_desc.va);
 428         break;
 429     default:
 430         fprintf(stderr,
 431                 "vscsi_preprocess_desc: Unknown format %x\n", req->dma_fmt);
 432         return -1;
 433     }
 434
 435     return 0;
 436 }
 437
 438 /* Callback to indicate that the SCSI layer has completed a transfer.  */
 439 static void vscsi_transfer_data(SCSIRequest *sreq, uint32_t len)
 440 {
 441     VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent);
 442     vscsi_req *req = sreq->hba_private;
 443     uint8_t *buf;
 444     int rc = 0;
 445
 446     dprintf("VSCSI: SCSI xfer complete tag=0x%x len=0x%x, req=%p\n",
 447             sreq->tag, len, req);
 448     if (req == NULL) {
 449         fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
 450         return;
 451     }
 452
 453     if (len) {
 454         buf = scsi_req_get_buf(sreq);
 455         rc = vscsi_srp_transfer_data(s, req, req->writing, buf, len);
 456     }
 457     if (rc < 0) {
 458         fprintf(stderr, "VSCSI: RDMA error rc=%d!\n", rc);
 459         vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
 460         scsi_req_abort(req->sreq, CHECK_CONDITION);
 461         return;
 462     }
 463
 464     /* Start next chunk */
 465     req->data_len -= rc;
 466     scsi_req_continue(sreq);
 467 }
 468
 469 /* Callback to indicate that the SCSI layer has completed a transfer.  */
 470 static void vscsi_command_complete(SCSIRequest *sreq, uint32_t status)
 471 {
 472     VSCSIState *s = DO_UPCAST(VSCSIState, vdev.qdev, sreq->bus->qbus.parent);
 473     vscsi_req *req = sreq->hba_private;
 474     int32_t res_in = 0, res_out = 0;
 475
 476     dprintf("VSCSI: SCSI cmd complete, r=0x%x tag=0x%x status=0x%x, req=%p\n",
 477             reason, sreq->tag, status, req);
 478     if (req == NULL) {
 479         fprintf(stderr, "VSCSI: Can't find request for tag 0x%x\n", sreq->tag);
 480         return;
 481     }
 482
 483     if (status == CHECK_CONDITION) {
 484         req->senselen = scsi_req_get_sense(req->sreq, req->sense,
 485                                            sizeof(req->sense));
 486         status = 0;
 487         dprintf("VSCSI: Sense data, %d bytes:\n", len);
 488         dprintf("       %02x  %02x  %02x  %02x  %02x  %02x  %02x  %02x\n",
 489                 req->sense[0], req->sense[1], req->sense[2], req->sense[3],
 490                 req->sense[4], req->sense[5], req->sense[6], req->sense[7]);
 491         dprintf("       %02x  %02x  %02x  %02x  %02x  %02x  %02x  %02x\n",
 492                 req->sense[8], req->sense[9], req->sense[10], req->sense[11],
 493                 req->sense[12], req->sense[13], req->sense[14], req->sense[15]);
 494     }
 495
 496     dprintf("VSCSI: Command complete err=%d\n", status);
 497     if (status == 0) {
 498         /* We handle overflows, not underflows for normal commands,
 499          * but hopefully nobody cares
 500          */
 501         if (req->writing) {
 502             res_out = req->data_len;
 503         } else {
 504             res_in = req->data_len;
 505         }
 506     }
 507     vscsi_send_rsp(s, req, status, res_in, res_out);
 508     vscsi_put_req(req);
 509 }
 510
 511 static void vscsi_request_cancelled(SCSIRequest *sreq)
 512 {
 513     vscsi_req *req = sreq->hba_private;
 514
 515     vscsi_put_req(req);
 516 }
 517
 518 static void vscsi_process_login(VSCSIState *s, vscsi_req *req)
 519 {
 520     union viosrp_iu *iu = &req->iu;
 521     struct srp_login_rsp *rsp = &iu->srp.login_rsp;
 522     uint64_t tag = iu->srp.rsp.tag;
 523
 524     dprintf("VSCSI: Got login, sendin response !\n");
 525
 526     /* TODO handle case that requested size is wrong and
 527      * buffer format is wrong
 528      */
 529     memset(iu, 0, sizeof(struct srp_login_rsp));
 530     rsp->opcode = SRP_LOGIN_RSP;
 531     /* Don't advertise quite as many request as we support to
 532      * keep room for management stuff etc...
 533      */
 534     rsp->req_lim_delta = cpu_to_be32(VSCSI_REQ_LIMIT-2);
 535     rsp->tag = tag;
 536     rsp->max_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
 537     rsp->max_ti_iu_len = cpu_to_be32(sizeof(union srp_iu));
 538     /* direct and indirect */
 539     rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT);
 540
 541     vscsi_send_iu(s, req, sizeof(*rsp), VIOSRP_SRP_FORMAT);
 542 }
 543
 544 static void vscsi_inquiry_no_target(VSCSIState *s, vscsi_req *req)
 545 {
 546     uint8_t *cdb = req->iu.srp.cmd.cdb;
 547     uint8_t resp_data[36];
 548     int rc, len, alen;
 549
 550     /* We dont do EVPD. Also check that page_code is 0 */
 551     if ((cdb[1] & 0x01) || (cdb[1] & 0x01) || cdb[2] != 0) {
 552         /* Send INVALID FIELD IN CDB */
 553         vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0);
 554         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
 555         return;
 556     }
 557     alen = cdb[3];
 558     alen = (alen << 8) | cdb[4];
 559     len = MIN(alen, 36);
 560
 561     /* Fake up inquiry using PQ=3 */
 562     memset(resp_data, 0, 36);
 563     resp_data[0] = 0x7f;   /* Not capable of supporting a device here */
 564     resp_data[2] = 0x06;   /* SPS-4 */
 565     resp_data[3] = 0x02;   /* Resp data format */
 566     resp_data[4] = 36 - 5; /* Additional length */
 567     resp_data[7] = 0x10;   /* Sync transfers */
 568     memcpy(&resp_data[16], "QEMU EMPTY      ", 16);
 569     memcpy(&resp_data[8], "QEMU    ", 8);
 570
 571     req->writing = 0;
 572     vscsi_preprocess_desc(req);
 573     rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len);
 574     if (rc < 0) {
 575         vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0);
 576         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
 577     } else {
 578         vscsi_send_rsp(s, req, 0, 36 - rc, 0);
 579     }
 580 }
 581
 582 static int vscsi_queue_cmd(VSCSIState *s, vscsi_req *req)
 583 {
 584     union srp_iu *srp = &req->iu.srp;
 585     SCSIDevice *sdev;
 586     int n, id, lun;
 587
 588     vscsi_decode_id_lun(be64_to_cpu(srp->cmd.lun), &id, &lun);
 589
 590     /* Qemu vs. linux issue with LUNs to be sorted out ... */
 591     sdev = (id < 8 && lun < 16) ? s->bus.devs[id] : NULL;
 592     if (!sdev) {
 593         dprintf("VSCSI: Command for id %d with no drive\n", id);
 594         if (srp->cmd.cdb[0] == INQUIRY) {
 595             vscsi_inquiry_no_target(s, req);
 596         } else {
 597             vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x24, 0x00);
 598             vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
 599         } return 1;
 600     }
 601
 602     req->lun = lun;
 603     req->sreq = scsi_req_new(sdev, req->qtag, lun, req);
 604     n = scsi_req_enqueue(req->sreq, srp->cmd.cdb);
 605
 606     dprintf("VSCSI: Queued command tag 0x%x CMD 0x%x ID %d LUN %d ret: %d\n",
 607             req->qtag, srp->cmd.cdb[0], id, lun, n);
 608
 609     if (n) {
 610         /* Transfer direction must be set before preprocessing the
 611          * descriptors
 612          */
 613         req->writing = (n < 1);
 614
 615         /* Preprocess RDMA descriptors */
 616         vscsi_preprocess_desc(req);
 617
 618         /* Get transfer direction and initiate transfer */
 619         if (n > 0) {
 620             req->data_len = n;
 621         } else if (n < 0) {
 622             req->data_len = -n;
 623         }
 624         scsi_req_continue(req->sreq);
 625     }
 626     /* Don't touch req here, it may have been recycled already */
 627
 628     return 0;
 629 }
 630
 631 static int vscsi_process_tsk_mgmt(VSCSIState *s, vscsi_req *req)
 632 {
 633     union viosrp_iu *iu = &req->iu;
 634     int fn;
 635
 636     fprintf(stderr, "vscsi_process_tsk_mgmt %02x\n",
 637             iu->srp.tsk_mgmt.tsk_mgmt_func);
 638
 639     switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
 640 #if 0 /* We really don't deal with these for now */
 641     case SRP_TSK_ABORT_TASK:
 642         fn = ABORT_TASK;
 643         break;
 644     case SRP_TSK_ABORT_TASK_SET:
 645         fn = ABORT_TASK_SET;
 646         break;
 647     case SRP_TSK_CLEAR_TASK_SET:
 648         fn = CLEAR_TASK_SET;
 649         break;
 650     case SRP_TSK_LUN_RESET:
 651         fn = LOGICAL_UNIT_RESET;
 652         break;
 653     case SRP_TSK_CLEAR_ACA:
 654         fn = CLEAR_ACA;
 655         break;
 656 #endif
 657     default:
 658         fn = 0;
 659     }
 660     if (fn) {
 661         /* XXX Send/Handle target task management */
 662         ;
 663     } else {
 664         vscsi_makeup_sense(s, req, ILLEGAL_REQUEST, 0x20, 0);
 665         vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0);
 666     }
 667     return !fn;
 668 }
 669
 670 static int vscsi_handle_srp_req(VSCSIState *s, vscsi_req *req)
 671 {
 672     union srp_iu *srp = &req->iu.srp;
 673     int done = 1;
 674     uint8_t opcode = srp->rsp.opcode;
 675
 676     switch (opcode) {
 677     case SRP_LOGIN_REQ:
 678         vscsi_process_login(s, req);
 679         break;
 680     case SRP_TSK_MGMT:
 681         done = vscsi_process_tsk_mgmt(s, req);
 682         break;
 683     case SRP_CMD:
 684         done = vscsi_queue_cmd(s, req);
 685         break;
 686     case SRP_LOGIN_RSP:
 687     case SRP_I_LOGOUT:
 688     case SRP_T_LOGOUT:
 689     case SRP_RSP:
 690     case SRP_CRED_REQ:
 691     case SRP_CRED_RSP:
 692     case SRP_AER_REQ:
 693     case SRP_AER_RSP:
 694         fprintf(stderr, "VSCSI: Unsupported opcode %02x\n", opcode);
 695         break;
 696     default:
 697         fprintf(stderr, "VSCSI: Unknown type %02x\n", opcode);
 698     }
 699
 700     return done;
 701 }
 702
 703 static int vscsi_send_adapter_info(VSCSIState *s, vscsi_req *req)
 704 {
 705     struct viosrp_adapter_info *sinfo;
 706     struct mad_adapter_info_data info;
 707     int rc;
 708
 709     sinfo = &req->iu.mad.adapter_info;
 710
 711 #if 0 /* What for ? */
 712     rc = spapr_tce_dma_read(&s->vdev, be64_to_cpu(sinfo->buffer),
 713                             &info, be16_to_cpu(sinfo->common.length));
 714     if (rc) {
 715         fprintf(stderr, "vscsi_send_adapter_info: DMA read failure !\n");
 716     }
 717 #endif
 718     memset(&info, 0, sizeof(info));
 719     strcpy(info.srp_version, SRP_VERSION);
 720     strncpy(info.partition_name, "qemu", sizeof("qemu"));
 721     info.partition_number = cpu_to_be32(0);
 722     info.mad_version = cpu_to_be32(1);
 723     info.os_type = cpu_to_be32(2);
 724     info.port_max_txu[0] = cpu_to_be32(VSCSI_MAX_SECTORS << 9);
 725
 726     rc = spapr_tce_dma_write(&s->vdev, be64_to_cpu(sinfo->buffer),
 727                              &info, be16_to_cpu(sinfo->common.length));
 728     if (rc)  {
 729         fprintf(stderr, "vscsi_send_adapter_info: DMA write failure !\n");
 730     }
 731
 732     sinfo->common.status = rc ? cpu_to_be32(1) : 0;
 733
 734     return vscsi_send_iu(s, req, sizeof(*sinfo), VIOSRP_MAD_FORMAT);
 735 }
 736
 737 static int vscsi_handle_mad_req(VSCSIState *s, vscsi_req *req)
 738 {
 739     union mad_iu *mad = &req->iu.mad;
 740
 741     switch (be32_to_cpu(mad->empty_iu.common.type)) {
 742     case VIOSRP_EMPTY_IU_TYPE:
 743         fprintf(stderr, "Unsupported EMPTY MAD IU\n");
 744         break;
 745     case VIOSRP_ERROR_LOG_TYPE:
 746         fprintf(stderr, "Unsupported ERROR LOG MAD IU\n");
 747         mad->error_log.common.status = cpu_to_be16(1);
 748         vscsi_send_iu(s, req, sizeof(mad->error_log), VIOSRP_MAD_FORMAT);
 749         break;
 750     case VIOSRP_ADAPTER_INFO_TYPE:
 751         vscsi_send_adapter_info(s, req);
 752         break;
 753     case VIOSRP_HOST_CONFIG_TYPE:
 754         mad->host_config.common.status = cpu_to_be16(1);
 755         vscsi_send_iu(s, req, sizeof(mad->host_config), VIOSRP_MAD_FORMAT);
 756         break;
 757     default:
 758         fprintf(stderr, "VSCSI: Unknown MAD type %02x\n",
 759                 be32_to_cpu(mad->empty_iu.common.type));
 760     }
 761
 762     return 1;
 763 }
 764
 765 static void vscsi_got_payload(VSCSIState *s, vscsi_crq *crq)
 766 {
 767     vscsi_req *req;
 768     int done;
 769
 770     req = vscsi_get_req(s);
 771     if (req == NULL) {
 772         fprintf(stderr, "VSCSI: Failed to get a request !\n");
 773         return;
 774     }
 775
 776     /* We only support a limited number of descriptors, we know
 777      * the ibmvscsi driver uses up to 10 max, so it should fit
 778      * in our 256 bytes IUs. If not we'll have to increase the size
 779      * of the structure.
 780      */
 781     if (crq->s.IU_length > sizeof(union viosrp_iu)) {
 782         fprintf(stderr, "VSCSI: SRP IU too long (%d bytes) !\n",
 783                 crq->s.IU_length);
 784         return;
 785     }
 786
 787     /* XXX Handle failure differently ? */
 788     if (spapr_tce_dma_read(&s->vdev, crq->s.IU_data_ptr, &req->iu,
 789                            crq->s.IU_length)) {
 790         fprintf(stderr, "vscsi_got_payload: DMA read failure !\n");
 791         qemu_free(req);
 792     }
 793     memcpy(&req->crq, crq, sizeof(vscsi_crq));
 794
 795     if (crq->s.format == VIOSRP_MAD_FORMAT) {
 796         done = vscsi_handle_mad_req(s, req);
 797     } else {
 798         done = vscsi_handle_srp_req(s, req);
 799     }
 800
 801     if (done) {
 802         vscsi_put_req(req);
 803     }
 804 }
 805
 806
 807 static int vscsi_do_crq(struct VIOsPAPRDevice *dev, uint8_t *crq_data)
 808 {
 809     VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
 810     vscsi_crq crq;
 811
 812     memcpy(crq.raw, crq_data, 16);
 813     crq.s.timeout = be16_to_cpu(crq.s.timeout);
 814     crq.s.IU_length = be16_to_cpu(crq.s.IU_length);
 815     crq.s.IU_data_ptr = be64_to_cpu(crq.s.IU_data_ptr);
 816
 817     dprintf("VSCSI: do_crq %02x %02x ...\n", crq.raw[0], crq.raw[1]);
 818
 819     switch (crq.s.valid) {
 820     case 0xc0: /* Init command/response */
 821
 822         /* Respond to initialization request */
 823         if (crq.s.format == 0x01) {
 824             memset(crq.raw, 0, 16);
 825             crq.s.valid = 0xc0;
 826             crq.s.format = 0x02;
 827             spapr_vio_send_crq(dev, crq.raw);
 828         }
 829
 830         /* Note that in hotplug cases, we might get a 0x02
 831          * as a result of us emitting the init request
 832          */
 833
 834         break;
 835     case 0xff: /* Link event */
 836
 837         /* Not handled for now */
 838
 839         break;
 840     case 0x80: /* Payloads */
 841         switch (crq.s.format) {
 842         case VIOSRP_SRP_FORMAT: /* AKA VSCSI request */
 843         case VIOSRP_MAD_FORMAT: /* AKA VSCSI response */
 844             vscsi_got_payload(s, &crq);
 845             break;
 846         case VIOSRP_OS400_FORMAT:
 847         case VIOSRP_AIX_FORMAT:
 848         case VIOSRP_LINUX_FORMAT:
 849         case VIOSRP_INLINE_FORMAT:
 850             fprintf(stderr, "vscsi_do_srq: Unsupported payload format %02x\n",
 851                     crq.s.format);
 852             break;
 853         default:
 854             fprintf(stderr, "vscsi_do_srq: Unknown payload format %02x\n",
 855                     crq.s.format);
 856         }
 857         break;
 858     default:
 859         fprintf(stderr, "vscsi_do_crq: unknown CRQ %02x %02x ...\n",
 860                 crq.raw[0], crq.raw[1]);
 861     };
 862
 863     return 0;
 864 }
 865
 866 static const struct SCSIBusOps vscsi_scsi_ops = {
 867     .transfer_data = vscsi_transfer_data,
 868     .complete = vscsi_command_complete,
 869     .cancel = vscsi_request_cancelled
 870 };
 871
 872 static int spapr_vscsi_init(VIOsPAPRDevice *dev)
 873 {
 874     VSCSIState *s = DO_UPCAST(VSCSIState, vdev, dev);
 875     int i;
 876
 877     dbg_vscsi_state = s;
 878
 879     /* Initialize qemu request tags */
 880     memset(s->reqs, 0, sizeof(s->reqs));
 881     for (i = 0; i < VSCSI_REQ_LIMIT; i++) {
 882         s->reqs[i].qtag = i;
 883     }
 884
 885     dev->crq.SendFunc = vscsi_do_crq;
 886
 887     scsi_bus_new(&s->bus, &dev->qdev, 1, VSCSI_REQ_LIMIT,
 888                  &vscsi_scsi_ops);
 889     if (!dev->qdev.hotplugged) {
 890         scsi_bus_legacy_handle_cmdline(&s->bus);
 891     }
 892
 893     return 0;
 894 }
 895
 896 void spapr_vscsi_create(VIOsPAPRBus *bus, uint32_t reg,
 897                         qemu_irq qirq, uint32_t vio_irq_num)
 898 {
 899     DeviceState *dev;
 900     VIOsPAPRDevice *sdev;
 901
 902     dev = qdev_create(&bus->bus, "spapr-vscsi");
 903     qdev_prop_set_uint32(dev, "reg", reg);
 904
 905     qdev_init_nofail(dev);
 906
 907     sdev = (VIOsPAPRDevice *)dev;
 908     sdev->qirq = qirq;
 909     sdev->vio_irq_num = vio_irq_num;
 910 }
 911
 912 static int spapr_vscsi_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
 913 {
 914     int ret;
 915
 916     ret = fdt_setprop_cell(fdt, node_off, "#address-cells", 2);
 917     if (ret < 0) {
 918         return ret;
 919     }
 920
 921     ret = fdt_setprop_cell(fdt, node_off, "#size-cells", 0);
 922     if (ret < 0) {
 923         return ret;
 924     }
 925
 926     return 0;
 927 }
 928
 929 static VIOsPAPRDeviceInfo spapr_vscsi = {
 930     .init = spapr_vscsi_init,
 931     .devnode = spapr_vscsi_devnode,
 932     .dt_name = "v-scsi",
 933     .dt_type = "vscsi",
 934     .dt_compatible = "IBM,v-scsi",
 935     .signal_mask = 0x00000001,
 936     .qdev.name = "spapr-vscsi",
 937     .qdev.size = sizeof(VSCSIState),
 938     .qdev.props = (Property[]) {
 939         DEFINE_PROP_UINT32("reg", VIOsPAPRDevice, reg, 0x2000),
 940         DEFINE_PROP_UINT32("dma-window", VIOsPAPRDevice,
 941                            rtce_window_size, 0x10000000),
 942         DEFINE_PROP_END_OF_LIST(),
 943     },
 944 };
 945
 946 static void spapr_vscsi_register(void)
 947 {
 948     spapr_vio_bus_register_withprop(&spapr_vscsi);
 949 }
 950 device_init(spapr_vscsi_register);