hw/scsi/vmw_pvscsi.c

   1 /*
   2  * QEMU VMWARE PVSCSI paravirtual SCSI bus
   3  *
   4  * Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
   5  *
   6  * Developed by Daynix Computing LTD (http://www.daynix.com)
   7  *
   8  * Based on implementation by Paolo Bonzini
   9  * http://lists.gnu.org/archive/html/qemu-devel/2011-08/msg00729.html
  10  *
  11  * Authors:
  12  * Paolo Bonzini <pbonzini@redhat.com>
  13  * Dmitry Fleytman <dmitry@daynix.com>
  14  * Yan Vugenfirer <yan@daynix.com>
  15  *
  16  * This work is licensed under the terms of the GNU GPL, version 2.
  17  * See the COPYING file in the top-level directory.
  18  *
  19  * NOTE about MSI-X:
  20  * MSI-X support has been removed for the moment because it leads Windows OS
  21  * to crash on startup. The crash happens because Windows driver requires
  22  * MSI-X shared memory to be part of the same BAR used for rings state
  23  * registers, etc. This is not supported by QEMU infrastructure so separate
  24  * BAR created from MSI-X purposes. Windows driver fails to deal with 2 BARs.
  25  *
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "qapi/error.h"
  30 #include "qemu/main-loop.h"
  31 #include "qemu/module.h"
  32 #include "hw/scsi/scsi.h"
  33 #include "migration/vmstate.h"
  34 #include "scsi/constants.h"
  35 #include "hw/pci/msi.h"
  36 #include "hw/qdev-properties.h"
  37 #include "vmw_pvscsi.h"
  38 #include "trace.h"
  39 #include "qom/object.h"
  40
  41
  42 #define PVSCSI_USE_64BIT         (true)
  43 #define PVSCSI_PER_VECTOR_MASK   (false)
  44
  45 #define PVSCSI_MAX_DEVS                   (64)
  46 #define PVSCSI_MSIX_NUM_VECTORS           (1)
  47
  48 #define PVSCSI_MAX_SG_ELEM                2048
  49
  50 #define PVSCSI_MAX_CMD_DATA_WORDS \
  51     (sizeof(PVSCSICmdDescSetupRings)/sizeof(uint32_t))
  52
  53 #define RS_GET_FIELD(pval, m, field) \
  54     ldl_le_pci_dma(&container_of(m, PVSCSIState, rings)->parent_obj, \
  55                  (m)->rs_pa + offsetof(struct PVSCSIRingsState, field), \
  56                  pval, MEMTXATTRS_UNSPECIFIED)
  57 #define RS_SET_FIELD(m, field, val) \
  58     (stl_le_pci_dma(&container_of(m, PVSCSIState, rings)->parent_obj, \
  59                  (m)->rs_pa + offsetof(struct PVSCSIRingsState, field), val, \
  60                  MEMTXATTRS_UNSPECIFIED))
  61
  62 struct PVSCSIClass {
  63     PCIDeviceClass parent_class;
  64     DeviceRealize parent_dc_realize;
  65 };
  66
  67 #define TYPE_PVSCSI "pvscsi"
  68 OBJECT_DECLARE_TYPE(PVSCSIState, PVSCSIClass, PVSCSI)
  69
  70
  71 /* Compatibility flags for migration */
  72 #define PVSCSI_COMPAT_OLD_PCI_CONFIGURATION_BIT 0
  73 #define PVSCSI_COMPAT_OLD_PCI_CONFIGURATION \
  74     (1 << PVSCSI_COMPAT_OLD_PCI_CONFIGURATION_BIT)
  75 #define PVSCSI_COMPAT_DISABLE_PCIE_BIT 1
  76 #define PVSCSI_COMPAT_DISABLE_PCIE \
  77     (1 << PVSCSI_COMPAT_DISABLE_PCIE_BIT)
  78
  79 #define PVSCSI_USE_OLD_PCI_CONFIGURATION(s) \
  80     ((s)->compat_flags & PVSCSI_COMPAT_OLD_PCI_CONFIGURATION)
  81 #define PVSCSI_MSI_OFFSET(s) \
  82     (PVSCSI_USE_OLD_PCI_CONFIGURATION(s) ? 0x50 : 0x7c)
  83 #define PVSCSI_EXP_EP_OFFSET (0x40)
  84
  85 typedef struct PVSCSIRingInfo {
  86     uint64_t            rs_pa;
  87     uint32_t            txr_len_mask;
  88     uint32_t            rxr_len_mask;
  89     uint32_t            msg_len_mask;
  90     uint64_t            req_ring_pages_pa[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
  91     uint64_t            cmp_ring_pages_pa[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
  92     uint64_t            msg_ring_pages_pa[PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES];
  93     uint64_t            consumed_ptr;
  94     uint64_t            filled_cmp_ptr;
  95     uint64_t            filled_msg_ptr;
  96 } PVSCSIRingInfo;
  97
  98 typedef struct PVSCSISGState {
  99     hwaddr elemAddr;
 100     hwaddr dataAddr;
 101     uint32_t resid;
 102 } PVSCSISGState;
 103
 104 typedef QTAILQ_HEAD(, PVSCSIRequest) PVSCSIRequestList;
 105
 106 struct PVSCSIState {
 107     PCIDevice parent_obj;
 108     MemoryRegion io_space;
 109     SCSIBus bus;
 110     QEMUBH *completion_worker;
 111     PVSCSIRequestList pending_queue;
 112     PVSCSIRequestList completion_queue;
 113
 114     uint64_t reg_interrupt_status;        /* Interrupt status register value */
 115     uint64_t reg_interrupt_enabled;       /* Interrupt mask register value   */
 116     uint64_t reg_command_status;          /* Command status register value   */
 117
 118     /* Command data adoption mechanism */
 119     uint64_t curr_cmd;                   /* Last command arrived             */
 120     uint32_t curr_cmd_data_cntr;         /* Amount of data for last command  */
 121
 122     /* Collector for current command data */
 123     uint32_t curr_cmd_data[PVSCSI_MAX_CMD_DATA_WORDS];
 124
 125     uint8_t rings_info_valid;            /* Whether data rings initialized   */
 126     uint8_t msg_ring_info_valid;         /* Whether message ring initialized */
 127     uint8_t use_msg;                     /* Whether to use message ring      */
 128
 129     uint8_t msi_used;                    /* For migration compatibility      */
 130     PVSCSIRingInfo rings;                /* Data transfer rings manager      */
 131     uint32_t resetting;                  /* Reset in progress                */
 132
 133     uint32_t compat_flags;
 134 };
 135
 136 typedef struct PVSCSIRequest {
 137     SCSIRequest *sreq;
 138     PVSCSIState *dev;
 139     uint8_t sense_key;
 140     uint8_t completed;
 141     int lun;
 142     QEMUSGList sgl;
 143     PVSCSISGState sg;
 144     struct PVSCSIRingReqDesc req;
 145     struct PVSCSIRingCmpDesc cmp;
 146     QTAILQ_ENTRY(PVSCSIRequest) next;
 147 } PVSCSIRequest;
 148
 149 /* Integer binary logarithm */
 150 static int
 151 pvscsi_log2(uint32_t input)
 152 {
 153     int log = 0;
 154     assert(input > 0);
 155     while (input >> ++log) {
 156     }
 157     return log;
 158 }
 159
 160 static void
 161 pvscsi_ring_init_data(PVSCSIRingInfo *m, PVSCSICmdDescSetupRings *ri)
 162 {
 163     int i;
 164     uint32_t txr_len_log2, rxr_len_log2;
 165     uint32_t req_ring_size, cmp_ring_size;
 166     m->rs_pa = ri->ringsStatePPN << VMW_PAGE_SHIFT;
 167
 168     req_ring_size = ri->reqRingNumPages * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
 169     cmp_ring_size = ri->cmpRingNumPages * PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE;
 170     txr_len_log2 = pvscsi_log2(req_ring_size - 1);
 171     rxr_len_log2 = pvscsi_log2(cmp_ring_size - 1);
 172
 173     m->txr_len_mask = MASK(txr_len_log2);
 174     m->rxr_len_mask = MASK(rxr_len_log2);
 175
 176     m->consumed_ptr = 0;
 177     m->filled_cmp_ptr = 0;
 178
 179     for (i = 0; i < ri->reqRingNumPages; i++) {
 180         m->req_ring_pages_pa[i] = ri->reqRingPPNs[i] << VMW_PAGE_SHIFT;
 181     }
 182
 183     for (i = 0; i < ri->cmpRingNumPages; i++) {
 184         m->cmp_ring_pages_pa[i] = ri->cmpRingPPNs[i] << VMW_PAGE_SHIFT;
 185     }
 186
 187     RS_SET_FIELD(m, reqProdIdx, 0);
 188     RS_SET_FIELD(m, reqConsIdx, 0);
 189     RS_SET_FIELD(m, reqNumEntriesLog2, txr_len_log2);
 190
 191     RS_SET_FIELD(m, cmpProdIdx, 0);
 192     RS_SET_FIELD(m, cmpConsIdx, 0);
 193     RS_SET_FIELD(m, cmpNumEntriesLog2, rxr_len_log2);
 194
 195     trace_pvscsi_ring_init_data(txr_len_log2, rxr_len_log2);
 196
 197     /* Flush ring state page changes */
 198     smp_wmb();
 199 }
 200
 201 static int
 202 pvscsi_ring_init_msg(PVSCSIRingInfo *m, PVSCSICmdDescSetupMsgRing *ri)
 203 {
 204     int i;
 205     uint32_t len_log2;
 206     uint32_t ring_size;
 207
 208     if (!ri->numPages || ri->numPages > PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES) {
 209         return -1;
 210     }
 211     ring_size = ri->numPages * PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE;
 212     len_log2 = pvscsi_log2(ring_size - 1);
 213
 214     m->msg_len_mask = MASK(len_log2);
 215
 216     m->filled_msg_ptr = 0;
 217
 218     for (i = 0; i < ri->numPages; i++) {
 219         m->msg_ring_pages_pa[i] = ri->ringPPNs[i] << VMW_PAGE_SHIFT;
 220     }
 221
 222     RS_SET_FIELD(m, msgProdIdx, 0);
 223     RS_SET_FIELD(m, msgConsIdx, 0);
 224     RS_SET_FIELD(m, msgNumEntriesLog2, len_log2);
 225
 226     trace_pvscsi_ring_init_msg(len_log2);
 227
 228     /* Flush ring state page changes */
 229     smp_wmb();
 230
 231     return 0;
 232 }
 233
 234 static void
 235 pvscsi_ring_cleanup(PVSCSIRingInfo *mgr)
 236 {
 237     mgr->rs_pa = 0;
 238     mgr->txr_len_mask = 0;
 239     mgr->rxr_len_mask = 0;
 240     mgr->msg_len_mask = 0;
 241     mgr->consumed_ptr = 0;
 242     mgr->filled_cmp_ptr = 0;
 243     mgr->filled_msg_ptr = 0;
 244     memset(mgr->req_ring_pages_pa, 0, sizeof(mgr->req_ring_pages_pa));
 245     memset(mgr->cmp_ring_pages_pa, 0, sizeof(mgr->cmp_ring_pages_pa));
 246     memset(mgr->msg_ring_pages_pa, 0, sizeof(mgr->msg_ring_pages_pa));
 247 }
 248
 249 static hwaddr
 250 pvscsi_ring_pop_req_descr(PVSCSIRingInfo *mgr)
 251 {
 252     uint32_t ready_ptr;
 253     uint32_t ring_size = PVSCSI_MAX_NUM_PAGES_REQ_RING
 254                             * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
 255
 256     RS_GET_FIELD(&ready_ptr, mgr, reqProdIdx);
 257     if (ready_ptr != mgr->consumed_ptr
 258         && ready_ptr - mgr->consumed_ptr < ring_size) {
 259         uint32_t next_ready_ptr =
 260             mgr->consumed_ptr++ & mgr->txr_len_mask;
 261         uint32_t next_ready_page =
 262             next_ready_ptr / PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
 263         uint32_t inpage_idx =
 264             next_ready_ptr % PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
 265
 266         return mgr->req_ring_pages_pa[next_ready_page] +
 267                inpage_idx * sizeof(PVSCSIRingReqDesc);
 268     } else {
 269         return 0;
 270     }
 271 }
 272
 273 static void
 274 pvscsi_ring_flush_req(PVSCSIRingInfo *mgr)
 275 {
 276     RS_SET_FIELD(mgr, reqConsIdx, mgr->consumed_ptr);
 277 }
 278
 279 static hwaddr
 280 pvscsi_ring_pop_cmp_descr(PVSCSIRingInfo *mgr)
 281 {
 282     /*
 283      * According to Linux driver code it explicitly verifies that number
 284      * of requests being processed by device is less then the size of
 285      * completion queue, so device may omit completion queue overflow
 286      * conditions check. We assume that this is true for other (Windows)
 287      * drivers as well.
 288      */
 289
 290     uint32_t free_cmp_ptr =
 291         mgr->filled_cmp_ptr++ & mgr->rxr_len_mask;
 292     uint32_t free_cmp_page =
 293         free_cmp_ptr / PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE;
 294     uint32_t inpage_idx =
 295         free_cmp_ptr % PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE;
 296     return mgr->cmp_ring_pages_pa[free_cmp_page] +
 297            inpage_idx * sizeof(PVSCSIRingCmpDesc);
 298 }
 299
 300 static hwaddr
 301 pvscsi_ring_pop_msg_descr(PVSCSIRingInfo *mgr)
 302 {
 303     uint32_t free_msg_ptr =
 304         mgr->filled_msg_ptr++ & mgr->msg_len_mask;
 305     uint32_t free_msg_page =
 306         free_msg_ptr / PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE;
 307     uint32_t inpage_idx =
 308         free_msg_ptr % PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE;
 309     return mgr->msg_ring_pages_pa[free_msg_page] +
 310            inpage_idx * sizeof(PVSCSIRingMsgDesc);
 311 }
 312
 313 static void
 314 pvscsi_ring_flush_cmp(PVSCSIRingInfo *mgr)
 315 {
 316     /* Flush descriptor changes */
 317     smp_wmb();
 318
 319     trace_pvscsi_ring_flush_cmp(mgr->filled_cmp_ptr);
 320
 321     RS_SET_FIELD(mgr, cmpProdIdx, mgr->filled_cmp_ptr);
 322 }
 323
 324 static bool
 325 pvscsi_ring_msg_has_room(PVSCSIRingInfo *mgr)
 326 {
 327     uint32_t prodIdx;
 328     uint32_t consIdx;
 329
 330     RS_GET_FIELD(&prodIdx, mgr, msgProdIdx);
 331     RS_GET_FIELD(&consIdx, mgr, msgConsIdx);
 332
 333     return (prodIdx - consIdx) < (mgr->msg_len_mask + 1);
 334 }
 335
 336 static void
 337 pvscsi_ring_flush_msg(PVSCSIRingInfo *mgr)
 338 {
 339     /* Flush descriptor changes */
 340     smp_wmb();
 341
 342     trace_pvscsi_ring_flush_msg(mgr->filled_msg_ptr);
 343
 344     RS_SET_FIELD(mgr, msgProdIdx, mgr->filled_msg_ptr);
 345 }
 346
 347 static void
 348 pvscsi_reset_state(PVSCSIState *s)
 349 {
 350     s->curr_cmd = PVSCSI_CMD_FIRST;
 351     s->curr_cmd_data_cntr = 0;
 352     s->reg_command_status = PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
 353     s->reg_interrupt_status = 0;
 354     pvscsi_ring_cleanup(&s->rings);
 355     s->rings_info_valid = FALSE;
 356     s->msg_ring_info_valid = FALSE;
 357     QTAILQ_INIT(&s->pending_queue);
 358     QTAILQ_INIT(&s->completion_queue);
 359 }
 360
 361 static void
 362 pvscsi_update_irq_status(PVSCSIState *s)
 363 {
 364     PCIDevice *d = PCI_DEVICE(s);
 365     bool should_raise = s->reg_interrupt_enabled & s->reg_interrupt_status;
 366
 367     trace_pvscsi_update_irq_level(should_raise, s->reg_interrupt_enabled,
 368                                   s->reg_interrupt_status);
 369
 370     if (msi_enabled(d)) {
 371         if (should_raise) {
 372             trace_pvscsi_update_irq_msi();
 373             msi_notify(d, PVSCSI_VECTOR_COMPLETION);
 374         }
 375         return;
 376     }
 377
 378     pci_set_irq(d, !!should_raise);
 379 }
 380
 381 static void
 382 pvscsi_raise_completion_interrupt(PVSCSIState *s)
 383 {
 384     s->reg_interrupt_status |= PVSCSI_INTR_CMPL_0;
 385
 386     /* Memory barrier to flush interrupt status register changes*/
 387     smp_wmb();
 388
 389     pvscsi_update_irq_status(s);
 390 }
 391
 392 static void
 393 pvscsi_raise_message_interrupt(PVSCSIState *s)
 394 {
 395     s->reg_interrupt_status |= PVSCSI_INTR_MSG_0;
 396
 397     /* Memory barrier to flush interrupt status register changes*/
 398     smp_wmb();
 399
 400     pvscsi_update_irq_status(s);
 401 }
 402
 403 static void
 404 pvscsi_cmp_ring_put(PVSCSIState *s, struct PVSCSIRingCmpDesc *cmp_desc)
 405 {
 406     hwaddr cmp_descr_pa;
 407
 408     cmp_descr_pa = pvscsi_ring_pop_cmp_descr(&s->rings);
 409     trace_pvscsi_cmp_ring_put(cmp_descr_pa);
 410     cpu_physical_memory_write(cmp_descr_pa, cmp_desc, sizeof(*cmp_desc));
 411 }
 412
 413 static void
 414 pvscsi_msg_ring_put(PVSCSIState *s, struct PVSCSIRingMsgDesc *msg_desc)
 415 {
 416     hwaddr msg_descr_pa;
 417
 418     msg_descr_pa = pvscsi_ring_pop_msg_descr(&s->rings);
 419     trace_pvscsi_msg_ring_put(msg_descr_pa);
 420     cpu_physical_memory_write(msg_descr_pa, msg_desc, sizeof(*msg_desc));
 421 }
 422
 423 static void
 424 pvscsi_process_completion_queue(void *opaque)
 425 {
 426     PVSCSIState *s = opaque;
 427     PVSCSIRequest *pvscsi_req;
 428     bool has_completed = false;
 429
 430     while (!QTAILQ_EMPTY(&s->completion_queue)) {
 431         pvscsi_req = QTAILQ_FIRST(&s->completion_queue);
 432         QTAILQ_REMOVE(&s->completion_queue, pvscsi_req, next);
 433         pvscsi_cmp_ring_put(s, &pvscsi_req->cmp);
 434         g_free(pvscsi_req);
 435         has_completed = true;
 436     }
 437
 438     if (has_completed) {
 439         pvscsi_ring_flush_cmp(&s->rings);
 440         pvscsi_raise_completion_interrupt(s);
 441     }
 442 }
 443
 444 static void
 445 pvscsi_reset_adapter(PVSCSIState *s)
 446 {
 447     s->resetting++;
 448     bus_cold_reset(BUS(&s->bus));
 449     s->resetting--;
 450     pvscsi_process_completion_queue(s);
 451     assert(QTAILQ_EMPTY(&s->pending_queue));
 452     pvscsi_reset_state(s);
 453 }
 454
 455 static void
 456 pvscsi_schedule_completion_processing(PVSCSIState *s)
 457 {
 458     /* Try putting more complete requests on the ring. */
 459     if (!QTAILQ_EMPTY(&s->completion_queue)) {
 460         qemu_bh_schedule(s->completion_worker);
 461     }
 462 }
 463
 464 static void
 465 pvscsi_complete_request(PVSCSIState *s, PVSCSIRequest *r)
 466 {
 467     assert(!r->completed);
 468
 469     trace_pvscsi_complete_request(r->cmp.context, r->cmp.dataLen,
 470                                   r->sense_key);
 471     if (r->sreq != NULL) {
 472         scsi_req_unref(r->sreq);
 473         r->sreq = NULL;
 474     }
 475     r->completed = 1;
 476     QTAILQ_REMOVE(&s->pending_queue, r, next);
 477     QTAILQ_INSERT_TAIL(&s->completion_queue, r, next);
 478     pvscsi_schedule_completion_processing(s);
 479 }
 480
 481 static QEMUSGList *pvscsi_get_sg_list(SCSIRequest *r)
 482 {
 483     PVSCSIRequest *req = r->hba_private;
 484
 485     trace_pvscsi_get_sg_list(req->sgl.nsg, req->sgl.size);
 486
 487     return &req->sgl;
 488 }
 489
 490 static void
 491 pvscsi_get_next_sg_elem(PVSCSISGState *sg)
 492 {
 493     struct PVSCSISGElement elem;
 494
 495     cpu_physical_memory_read(sg->elemAddr, &elem, sizeof(elem));
 496     if ((elem.flags & ~PVSCSI_KNOWN_FLAGS) != 0) {
 497         /*
 498             * There is PVSCSI_SGE_FLAG_CHAIN_ELEMENT flag described in
 499             * header file but its value is unknown. This flag requires
 500             * additional processing, so we put warning here to catch it
 501             * some day and make proper implementation
 502             */
 503         trace_pvscsi_get_next_sg_elem(elem.flags);
 504     }
 505
 506     sg->elemAddr += sizeof(elem);
 507     sg->dataAddr = elem.addr;
 508     sg->resid = elem.length;
 509 }
 510
 511 static void
 512 pvscsi_write_sense(PVSCSIRequest *r, uint8_t *sense, int len)
 513 {
 514     r->cmp.senseLen = MIN(r->req.senseLen, len);
 515     r->sense_key = sense[(sense[0] & 2) ? 1 : 2];
 516     cpu_physical_memory_write(r->req.senseAddr, sense, r->cmp.senseLen);
 517 }
 518
 519 static void
 520 pvscsi_command_failed(SCSIRequest *req)
 521 {
 522     PVSCSIRequest *pvscsi_req = req->hba_private;
 523     PVSCSIState *s;
 524
 525     if (!pvscsi_req) {
 526         trace_pvscsi_command_complete_not_found(req->tag);
 527         return;
 528     }
 529     s = pvscsi_req->dev;
 530
 531     switch (req->host_status) {
 532     case SCSI_HOST_NO_LUN:
 533         pvscsi_req->cmp.hostStatus = BTSTAT_LUNMISMATCH;
 534         break;
 535     case SCSI_HOST_BUSY:
 536         pvscsi_req->cmp.hostStatus = BTSTAT_ABORTQUEUE;
 537         break;
 538     case SCSI_HOST_TIME_OUT:
 539     case SCSI_HOST_ABORTED:
 540         pvscsi_req->cmp.hostStatus = BTSTAT_SENTRST;
 541         break;
 542     case SCSI_HOST_BAD_RESPONSE:
 543         pvscsi_req->cmp.hostStatus = BTSTAT_SELTIMEO;
 544         break;
 545     case SCSI_HOST_RESET:
 546         pvscsi_req->cmp.hostStatus = BTSTAT_BUSRESET;
 547         break;
 548     default:
 549         pvscsi_req->cmp.hostStatus = BTSTAT_HASOFTWARE;
 550         break;
 551     }
 552     pvscsi_req->cmp.scsiStatus = GOOD;
 553     qemu_sglist_destroy(&pvscsi_req->sgl);
 554     pvscsi_complete_request(s, pvscsi_req);
 555 }
 556
 557 static void
 558 pvscsi_command_complete(SCSIRequest *req, size_t resid)
 559 {
 560     PVSCSIRequest *pvscsi_req = req->hba_private;
 561     PVSCSIState *s;
 562
 563     if (!pvscsi_req) {
 564         trace_pvscsi_command_complete_not_found(req->tag);
 565         return;
 566     }
 567     s = pvscsi_req->dev;
 568
 569     if (resid) {
 570         /* Short transfer.  */
 571         trace_pvscsi_command_complete_data_run();
 572         pvscsi_req->cmp.hostStatus = BTSTAT_DATARUN;
 573     }
 574
 575     pvscsi_req->cmp.scsiStatus = req->status;
 576     if (pvscsi_req->cmp.scsiStatus == CHECK_CONDITION) {
 577         uint8_t sense[SCSI_SENSE_BUF_SIZE];
 578         int sense_len =
 579             scsi_req_get_sense(pvscsi_req->sreq, sense, sizeof(sense));
 580
 581         trace_pvscsi_command_complete_sense_len(sense_len);
 582         pvscsi_write_sense(pvscsi_req, sense, sense_len);
 583     }
 584     qemu_sglist_destroy(&pvscsi_req->sgl);
 585     pvscsi_complete_request(s, pvscsi_req);
 586 }
 587
 588 static void
 589 pvscsi_send_msg(PVSCSIState *s, SCSIDevice *dev, uint32_t msg_type)
 590 {
 591     if (s->msg_ring_info_valid && pvscsi_ring_msg_has_room(&s->rings)) {
 592         PVSCSIMsgDescDevStatusChanged msg = {0};
 593
 594         msg.type = msg_type;
 595         msg.bus = dev->channel;
 596         msg.target = dev->id;
 597         msg.lun[1] = dev->lun;
 598
 599         pvscsi_msg_ring_put(s, (PVSCSIRingMsgDesc *)&msg);
 600         pvscsi_ring_flush_msg(&s->rings);
 601         pvscsi_raise_message_interrupt(s);
 602     }
 603 }
 604
 605 static void
 606 pvscsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp)
 607 {
 608     PVSCSIState *s = PVSCSI(hotplug_dev);
 609
 610     pvscsi_send_msg(s, SCSI_DEVICE(dev), PVSCSI_MSG_DEV_ADDED);
 611 }
 612
 613 static void
 614 pvscsi_hot_unplug(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp)
 615 {
 616     PVSCSIState *s = PVSCSI(hotplug_dev);
 617
 618     pvscsi_send_msg(s, SCSI_DEVICE(dev), PVSCSI_MSG_DEV_REMOVED);
 619     qdev_simple_device_unplug_cb(hotplug_dev, dev, errp);
 620 }
 621
 622 static void
 623 pvscsi_request_cancelled(SCSIRequest *req)
 624 {
 625     PVSCSIRequest *pvscsi_req = req->hba_private;
 626     PVSCSIState *s = pvscsi_req->dev;
 627
 628     if (pvscsi_req->completed) {
 629         return;
 630     }
 631
 632    if (pvscsi_req->dev->resetting) {
 633        pvscsi_req->cmp.hostStatus = BTSTAT_BUSRESET;
 634     } else {
 635        pvscsi_req->cmp.hostStatus = BTSTAT_ABORTQUEUE;
 636     }
 637
 638     pvscsi_complete_request(s, pvscsi_req);
 639 }
 640
 641 static SCSIDevice*
 642 pvscsi_device_find(PVSCSIState *s, int channel, int target,
 643                    uint8_t *requested_lun, uint8_t *target_lun)
 644 {
 645     if (requested_lun[0] || requested_lun[2] || requested_lun[3] ||
 646         requested_lun[4] || requested_lun[5] || requested_lun[6] ||
 647         requested_lun[7] || (target > PVSCSI_MAX_DEVS)) {
 648         return NULL;
 649     } else {
 650         *target_lun = requested_lun[1];
 651         return scsi_device_find(&s->bus, channel, target, *target_lun);
 652     }
 653 }
 654
 655 static PVSCSIRequest *
 656 pvscsi_queue_pending_descriptor(PVSCSIState *s, SCSIDevice **d,
 657                                 struct PVSCSIRingReqDesc *descr)
 658 {
 659     PVSCSIRequest *pvscsi_req;
 660     uint8_t lun;
 661
 662     pvscsi_req = g_malloc0(sizeof(*pvscsi_req));
 663     pvscsi_req->dev = s;
 664     pvscsi_req->req = *descr;
 665     pvscsi_req->cmp.context = pvscsi_req->req.context;
 666     QTAILQ_INSERT_TAIL(&s->pending_queue, pvscsi_req, next);
 667
 668     *d = pvscsi_device_find(s, descr->bus, descr->target, descr->lun, &lun);
 669     if (*d) {
 670         pvscsi_req->lun = lun;
 671     }
 672
 673     return pvscsi_req;
 674 }
 675
 676 static void
 677 pvscsi_convert_sglist(PVSCSIRequest *r)
 678 {
 679     uint32_t chunk_size, elmcnt = 0;
 680     uint64_t data_length = r->req.dataLen;
 681     PVSCSISGState sg = r->sg;
 682     while (data_length && elmcnt < PVSCSI_MAX_SG_ELEM) {
 683         while (!sg.resid && elmcnt++ < PVSCSI_MAX_SG_ELEM) {
 684             pvscsi_get_next_sg_elem(&sg);
 685             trace_pvscsi_convert_sglist(r->req.context, r->sg.dataAddr,
 686                                         r->sg.resid);
 687         }
 688         chunk_size = MIN(data_length, sg.resid);
 689         if (chunk_size) {
 690             qemu_sglist_add(&r->sgl, sg.dataAddr, chunk_size);
 691         }
 692
 693         sg.dataAddr += chunk_size;
 694         data_length -= chunk_size;
 695         sg.resid -= chunk_size;
 696     }
 697 }
 698
 699 static void
 700 pvscsi_build_sglist(PVSCSIState *s, PVSCSIRequest *r)
 701 {
 702     PCIDevice *d = PCI_DEVICE(s);
 703
 704     pci_dma_sglist_init(&r->sgl, d, 1);
 705     if (r->req.flags & PVSCSI_FLAG_CMD_WITH_SG_LIST) {
 706         pvscsi_convert_sglist(r);
 707     } else {
 708         qemu_sglist_add(&r->sgl, r->req.dataAddr, r->req.dataLen);
 709     }
 710 }
 711
 712 static void
 713 pvscsi_process_request_descriptor(PVSCSIState *s,
 714                                   struct PVSCSIRingReqDesc *descr)
 715 {
 716     SCSIDevice *d;
 717     PVSCSIRequest *r = pvscsi_queue_pending_descriptor(s, &d, descr);
 718     int64_t n;
 719
 720     trace_pvscsi_process_req_descr(descr->cdb[0], descr->context);
 721
 722     if (!d) {
 723         r->cmp.hostStatus = BTSTAT_SELTIMEO;
 724         trace_pvscsi_process_req_descr_unknown_device();
 725         pvscsi_complete_request(s, r);
 726         return;
 727     }
 728
 729     if (descr->flags & PVSCSI_FLAG_CMD_WITH_SG_LIST) {
 730         r->sg.elemAddr = descr->dataAddr;
 731     }
 732
 733     r->sreq = scsi_req_new(d, descr->context, r->lun, descr->cdb, descr->cdbLen, r);
 734     if (r->sreq->cmd.mode == SCSI_XFER_FROM_DEV &&
 735         (descr->flags & PVSCSI_FLAG_CMD_DIR_TODEVICE)) {
 736         r->cmp.hostStatus = BTSTAT_BADMSG;
 737         trace_pvscsi_process_req_descr_invalid_dir();
 738         scsi_req_cancel(r->sreq);
 739         return;
 740     }
 741     if (r->sreq->cmd.mode == SCSI_XFER_TO_DEV &&
 742         (descr->flags & PVSCSI_FLAG_CMD_DIR_TOHOST)) {
 743         r->cmp.hostStatus = BTSTAT_BADMSG;
 744         trace_pvscsi_process_req_descr_invalid_dir();
 745         scsi_req_cancel(r->sreq);
 746         return;
 747     }
 748
 749     pvscsi_build_sglist(s, r);
 750     n = scsi_req_enqueue(r->sreq);
 751
 752     if (n) {
 753         scsi_req_continue(r->sreq);
 754     }
 755 }
 756
 757 static void
 758 pvscsi_process_io(PVSCSIState *s)
 759 {
 760     PVSCSIRingReqDesc descr;
 761     hwaddr next_descr_pa;
 762
 763     if (!s->rings_info_valid) {
 764         return;
 765     }
 766
 767     while ((next_descr_pa = pvscsi_ring_pop_req_descr(&s->rings)) != 0) {
 768
 769         /* Only read after production index verification */
 770         smp_rmb();
 771
 772         trace_pvscsi_process_io(next_descr_pa);
 773         cpu_physical_memory_read(next_descr_pa, &descr, sizeof(descr));
 774         pvscsi_process_request_descriptor(s, &descr);
 775     }
 776
 777     pvscsi_ring_flush_req(&s->rings);
 778 }
 779
 780 static void
 781 pvscsi_dbg_dump_tx_rings_config(PVSCSICmdDescSetupRings *rc)
 782 {
 783     int i;
 784     trace_pvscsi_tx_rings_ppn("Rings State", rc->ringsStatePPN);
 785
 786     trace_pvscsi_tx_rings_num_pages("Request Ring", rc->reqRingNumPages);
 787     for (i = 0; i < rc->reqRingNumPages; i++) {
 788         trace_pvscsi_tx_rings_ppn("Request Ring", rc->reqRingPPNs[i]);
 789     }
 790
 791     trace_pvscsi_tx_rings_num_pages("Confirm Ring", rc->cmpRingNumPages);
 792     for (i = 0; i < rc->cmpRingNumPages; i++) {
 793         trace_pvscsi_tx_rings_ppn("Confirm Ring", rc->cmpRingPPNs[i]);
 794     }
 795 }
 796
 797 static uint64_t
 798 pvscsi_on_cmd_config(PVSCSIState *s)
 799 {
 800     trace_pvscsi_on_cmd_noimpl("PVSCSI_CMD_CONFIG");
 801     return PVSCSI_COMMAND_PROCESSING_FAILED;
 802 }
 803
 804 static uint64_t
 805 pvscsi_on_cmd_unplug(PVSCSIState *s)
 806 {
 807     trace_pvscsi_on_cmd_noimpl("PVSCSI_CMD_DEVICE_UNPLUG");
 808     return PVSCSI_COMMAND_PROCESSING_FAILED;
 809 }
 810
 811 static uint64_t
 812 pvscsi_on_issue_scsi(PVSCSIState *s)
 813 {
 814     trace_pvscsi_on_cmd_noimpl("PVSCSI_CMD_ISSUE_SCSI");
 815     return PVSCSI_COMMAND_PROCESSING_FAILED;
 816 }
 817
 818 static uint64_t
 819 pvscsi_on_cmd_setup_rings(PVSCSIState *s)
 820 {
 821     PVSCSICmdDescSetupRings *rc =
 822         (PVSCSICmdDescSetupRings *) s->curr_cmd_data;
 823
 824     trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_SETUP_RINGS");
 825
 826     if (!rc->reqRingNumPages
 827         || rc->reqRingNumPages > PVSCSI_SETUP_RINGS_MAX_NUM_PAGES
 828         || !rc->cmpRingNumPages
 829         || rc->cmpRingNumPages > PVSCSI_SETUP_RINGS_MAX_NUM_PAGES) {
 830         return PVSCSI_COMMAND_PROCESSING_FAILED;
 831     }
 832
 833     pvscsi_dbg_dump_tx_rings_config(rc);
 834     pvscsi_ring_init_data(&s->rings, rc);
 835
 836     s->rings_info_valid = TRUE;
 837     return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
 838 }
 839
 840 static uint64_t
 841 pvscsi_on_cmd_abort(PVSCSIState *s)
 842 {
 843     PVSCSICmdDescAbortCmd *cmd = (PVSCSICmdDescAbortCmd *) s->curr_cmd_data;
 844     PVSCSIRequest *r, *next;
 845
 846     trace_pvscsi_on_cmd_abort(cmd->context, cmd->target);
 847
 848     QTAILQ_FOREACH_SAFE(r, &s->pending_queue, next, next) {
 849         if (r->req.context == cmd->context) {
 850             break;
 851         }
 852     }
 853     if (r) {
 854         assert(!r->completed);
 855         r->cmp.hostStatus = BTSTAT_ABORTQUEUE;
 856         scsi_req_cancel(r->sreq);
 857     }
 858
 859     return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
 860 }
 861
 862 static uint64_t
 863 pvscsi_on_cmd_unknown(PVSCSIState *s)
 864 {
 865     trace_pvscsi_on_cmd_unknown_data(s->curr_cmd_data[0]);
 866     return PVSCSI_COMMAND_PROCESSING_FAILED;
 867 }
 868
 869 static uint64_t
 870 pvscsi_on_cmd_reset_device(PVSCSIState *s)
 871 {
 872     uint8_t target_lun = 0;
 873     struct PVSCSICmdDescResetDevice *cmd =
 874         (struct PVSCSICmdDescResetDevice *) s->curr_cmd_data;
 875     SCSIDevice *sdev;
 876
 877     sdev = pvscsi_device_find(s, 0, cmd->target, cmd->lun, &target_lun);
 878
 879     trace_pvscsi_on_cmd_reset_dev(cmd->target, (int) target_lun, sdev);
 880
 881     if (sdev != NULL) {
 882         s->resetting++;
 883         device_cold_reset(&sdev->qdev);
 884         s->resetting--;
 885         return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
 886     }
 887
 888     return PVSCSI_COMMAND_PROCESSING_FAILED;
 889 }
 890
 891 static uint64_t
 892 pvscsi_on_cmd_reset_bus(PVSCSIState *s)
 893 {
 894     trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_RESET_BUS");
 895
 896     s->resetting++;
 897     bus_cold_reset(BUS(&s->bus));
 898     s->resetting--;
 899     return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
 900 }
 901
 902 static uint64_t
 903 pvscsi_on_cmd_setup_msg_ring(PVSCSIState *s)
 904 {
 905     PVSCSICmdDescSetupMsgRing *rc =
 906         (PVSCSICmdDescSetupMsgRing *) s->curr_cmd_data;
 907
 908     trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_SETUP_MSG_RING");
 909
 910     if (!s->use_msg) {
 911         return PVSCSI_COMMAND_PROCESSING_FAILED;
 912     }
 913
 914     if (s->rings_info_valid) {
 915         if (pvscsi_ring_init_msg(&s->rings, rc) < 0) {
 916             return PVSCSI_COMMAND_PROCESSING_FAILED;
 917         }
 918         s->msg_ring_info_valid = TRUE;
 919     }
 920     return sizeof(PVSCSICmdDescSetupMsgRing) / sizeof(uint32_t);
 921 }
 922
 923 static uint64_t
 924 pvscsi_on_cmd_adapter_reset(PVSCSIState *s)
 925 {
 926     trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_ADAPTER_RESET");
 927
 928     pvscsi_reset_adapter(s);
 929     return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
 930 }
 931
 932 static const struct {
 933     int       data_size;
 934     uint64_t  (*handler_fn)(PVSCSIState *s);
 935 } pvscsi_commands[] = {
 936     [PVSCSI_CMD_FIRST] = {
 937         .data_size = 0,
 938         .handler_fn = pvscsi_on_cmd_unknown,
 939     },
 940
 941     /* Not implemented, data size defined based on what arrives on windows */
 942     [PVSCSI_CMD_CONFIG] = {
 943         .data_size = 6 * sizeof(uint32_t),
 944         .handler_fn = pvscsi_on_cmd_config,
 945     },
 946
 947     /* Command not implemented, data size is unknown */
 948     [PVSCSI_CMD_ISSUE_SCSI] = {
 949         .data_size = 0,
 950         .handler_fn = pvscsi_on_issue_scsi,
 951     },
 952
 953     /* Command not implemented, data size is unknown */
 954     [PVSCSI_CMD_DEVICE_UNPLUG] = {
 955         .data_size = 0,
 956         .handler_fn = pvscsi_on_cmd_unplug,
 957     },
 958
 959     [PVSCSI_CMD_SETUP_RINGS] = {
 960         .data_size = sizeof(PVSCSICmdDescSetupRings),
 961         .handler_fn = pvscsi_on_cmd_setup_rings,
 962     },
 963
 964     [PVSCSI_CMD_RESET_DEVICE] = {
 965         .data_size = sizeof(struct PVSCSICmdDescResetDevice),
 966         .handler_fn = pvscsi_on_cmd_reset_device,
 967     },
 968
 969     [PVSCSI_CMD_RESET_BUS] = {
 970         .data_size = 0,
 971         .handler_fn = pvscsi_on_cmd_reset_bus,
 972     },
 973
 974     [PVSCSI_CMD_SETUP_MSG_RING] = {
 975         .data_size = sizeof(PVSCSICmdDescSetupMsgRing),
 976         .handler_fn = pvscsi_on_cmd_setup_msg_ring,
 977     },
 978
 979     [PVSCSI_CMD_ADAPTER_RESET] = {
 980         .data_size = 0,
 981         .handler_fn = pvscsi_on_cmd_adapter_reset,
 982     },
 983
 984     [PVSCSI_CMD_ABORT_CMD] = {
 985         .data_size = sizeof(struct PVSCSICmdDescAbortCmd),
 986         .handler_fn = pvscsi_on_cmd_abort,
 987     },
 988 };
 989
 990 static void
 991 pvscsi_do_command_processing(PVSCSIState *s)
 992 {
 993     size_t bytes_arrived = s->curr_cmd_data_cntr * sizeof(uint32_t);
 994
 995     assert(s->curr_cmd < PVSCSI_CMD_LAST);
 996     if (bytes_arrived >= pvscsi_commands[s->curr_cmd].data_size) {
 997         s->reg_command_status = pvscsi_commands[s->curr_cmd].handler_fn(s);
 998         s->curr_cmd = PVSCSI_CMD_FIRST;
 999         s->curr_cmd_data_cntr   = 0;
1000     }
1001 }
1002
1003 static void
1004 pvscsi_on_command_data(PVSCSIState *s, uint32_t value)
1005 {
1006     size_t bytes_arrived = s->curr_cmd_data_cntr * sizeof(uint32_t);
1007
1008     assert(bytes_arrived < sizeof(s->curr_cmd_data));
1009     s->curr_cmd_data[s->curr_cmd_data_cntr++] = value;
1010
1011     pvscsi_do_command_processing(s);
1012 }
1013
1014 static void
1015 pvscsi_on_command(PVSCSIState *s, uint64_t cmd_id)
1016 {
1017     if ((cmd_id > PVSCSI_CMD_FIRST) && (cmd_id < PVSCSI_CMD_LAST)) {
1018         s->curr_cmd = cmd_id;
1019     } else {
1020         s->curr_cmd = PVSCSI_CMD_FIRST;
1021         trace_pvscsi_on_cmd_unknown(cmd_id);
1022     }
1023
1024     s->curr_cmd_data_cntr = 0;
1025     s->reg_command_status = PVSCSI_COMMAND_NOT_ENOUGH_DATA;
1026
1027     pvscsi_do_command_processing(s);
1028 }
1029
1030 static void
1031 pvscsi_io_write(void *opaque, hwaddr addr,
1032                 uint64_t val, unsigned size)
1033 {
1034     PVSCSIState *s = opaque;
1035
1036     switch (addr) {
1037     case PVSCSI_REG_OFFSET_COMMAND:
1038         pvscsi_on_command(s, val);
1039         break;
1040
1041     case PVSCSI_REG_OFFSET_COMMAND_DATA:
1042         pvscsi_on_command_data(s, (uint32_t) val);
1043         break;
1044
1045     case PVSCSI_REG_OFFSET_INTR_STATUS:
1046         trace_pvscsi_io_write("PVSCSI_REG_OFFSET_INTR_STATUS", val);
1047         s->reg_interrupt_status &= ~val;
1048         pvscsi_update_irq_status(s);
1049         pvscsi_schedule_completion_processing(s);
1050         break;
1051
1052     case PVSCSI_REG_OFFSET_INTR_MASK:
1053         trace_pvscsi_io_write("PVSCSI_REG_OFFSET_INTR_MASK", val);
1054         s->reg_interrupt_enabled = val;
1055         pvscsi_update_irq_status(s);
1056         break;
1057
1058     case PVSCSI_REG_OFFSET_KICK_NON_RW_IO:
1059         trace_pvscsi_io_write("PVSCSI_REG_OFFSET_KICK_NON_RW_IO", val);
1060         pvscsi_process_io(s);
1061         break;
1062
1063     case PVSCSI_REG_OFFSET_KICK_RW_IO:
1064         trace_pvscsi_io_write("PVSCSI_REG_OFFSET_KICK_RW_IO", val);
1065         pvscsi_process_io(s);
1066         break;
1067
1068     case PVSCSI_REG_OFFSET_DEBUG:
1069         trace_pvscsi_io_write("PVSCSI_REG_OFFSET_DEBUG", val);
1070         break;
1071
1072     default:
1073         trace_pvscsi_io_write_unknown(addr, size, val);
1074         break;
1075     }
1076
1077 }
1078
1079 static uint64_t
1080 pvscsi_io_read(void *opaque, hwaddr addr, unsigned size)
1081 {
1082     PVSCSIState *s = opaque;
1083
1084     switch (addr) {
1085     case PVSCSI_REG_OFFSET_INTR_STATUS:
1086         trace_pvscsi_io_read("PVSCSI_REG_OFFSET_INTR_STATUS",
1087                              s->reg_interrupt_status);
1088         return s->reg_interrupt_status;
1089
1090     case PVSCSI_REG_OFFSET_INTR_MASK:
1091         trace_pvscsi_io_read("PVSCSI_REG_OFFSET_INTR_MASK",
1092                              s->reg_interrupt_status);
1093         return s->reg_interrupt_enabled;
1094
1095     case PVSCSI_REG_OFFSET_COMMAND_STATUS:
1096         trace_pvscsi_io_read("PVSCSI_REG_OFFSET_COMMAND_STATUS",
1097                              s->reg_interrupt_status);
1098         return s->reg_command_status;
1099
1100     default:
1101         trace_pvscsi_io_read_unknown(addr, size);
1102         return 0;
1103     }
1104 }
1105
1106
1107 static void
1108 pvscsi_init_msi(PVSCSIState *s)
1109 {
1110     int res;
1111     PCIDevice *d = PCI_DEVICE(s);
1112
1113     res = msi_init(d, PVSCSI_MSI_OFFSET(s), PVSCSI_MSIX_NUM_VECTORS,
1114                    PVSCSI_USE_64BIT, PVSCSI_PER_VECTOR_MASK, NULL);
1115     if (res < 0) {
1116         trace_pvscsi_init_msi_fail(res);
1117         s->msi_used = false;
1118     } else {
1119         s->msi_used = true;
1120     }
1121 }
1122
1123 static void
1124 pvscsi_cleanup_msi(PVSCSIState *s)
1125 {
1126     PCIDevice *d = PCI_DEVICE(s);
1127
1128     msi_uninit(d);
1129 }
1130
1131 static const MemoryRegionOps pvscsi_ops = {
1132         .read = pvscsi_io_read,
1133         .write = pvscsi_io_write,
1134         .endianness = DEVICE_LITTLE_ENDIAN,
1135         .impl = {
1136                 .min_access_size = 4,
1137                 .max_access_size = 4,
1138         },
1139 };
1140
1141 static const struct SCSIBusInfo pvscsi_scsi_info = {
1142         .tcq = true,
1143         .max_target = PVSCSI_MAX_DEVS,
1144         .max_channel = 0,
1145         .max_lun = 0,
1146
1147         .get_sg_list = pvscsi_get_sg_list,
1148         .complete = pvscsi_command_complete,
1149         .cancel = pvscsi_request_cancelled,
1150         .fail = pvscsi_command_failed,
1151 };
1152
1153 static void
1154 pvscsi_realizefn(PCIDevice *pci_dev, Error **errp)
1155 {
1156     PVSCSIState *s = PVSCSI(pci_dev);
1157
1158     trace_pvscsi_state("init");
1159
1160     /* PCI subsystem ID, subsystem vendor ID, revision */
1161     if (PVSCSI_USE_OLD_PCI_CONFIGURATION(s)) {
1162         pci_set_word(pci_dev->config + PCI_SUBSYSTEM_ID, 0x1000);
1163     } else {
1164         pci_set_word(pci_dev->config + PCI_SUBSYSTEM_VENDOR_ID,
1165                      PCI_VENDOR_ID_VMWARE);
1166         pci_set_word(pci_dev->config + PCI_SUBSYSTEM_ID,
1167                      PCI_DEVICE_ID_VMWARE_PVSCSI);
1168         pci_config_set_revision(pci_dev->config, 0x2);
1169     }
1170
1171     /* PCI latency timer = 255 */
1172     pci_dev->config[PCI_LATENCY_TIMER] = 0xff;
1173
1174     /* Interrupt pin A */
1175     pci_config_set_interrupt_pin(pci_dev->config, 1);
1176
1177     memory_region_init_io(&s->io_space, OBJECT(s), &pvscsi_ops, s,
1178                           "pvscsi-io", PVSCSI_MEM_SPACE_SIZE);
1179     pci_register_bar(pci_dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->io_space);
1180
1181     pvscsi_init_msi(s);
1182
1183     if (pci_is_express(pci_dev) && pci_bus_is_express(pci_get_bus(pci_dev))) {
1184         pcie_endpoint_cap_init(pci_dev, PVSCSI_EXP_EP_OFFSET);
1185     }
1186
1187     s->completion_worker = qemu_bh_new_guarded(pvscsi_process_completion_queue, s,
1188                                                &DEVICE(pci_dev)->mem_reentrancy_guard);
1189
1190     scsi_bus_init(&s->bus, sizeof(s->bus), DEVICE(pci_dev), &pvscsi_scsi_info);
1191     /* override default SCSI bus hotplug-handler, with pvscsi's one */
1192     qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(s));
1193     pvscsi_reset_state(s);
1194 }
1195
1196 static void
1197 pvscsi_uninit(PCIDevice *pci_dev)
1198 {
1199     PVSCSIState *s = PVSCSI(pci_dev);
1200
1201     trace_pvscsi_state("uninit");
1202     qemu_bh_delete(s->completion_worker);
1203
1204     pvscsi_cleanup_msi(s);
1205 }
1206
1207 static void
1208 pvscsi_reset(DeviceState *dev)
1209 {
1210     PCIDevice *d = PCI_DEVICE(dev);
1211     PVSCSIState *s = PVSCSI(d);
1212
1213     trace_pvscsi_state("reset");
1214     pvscsi_reset_adapter(s);
1215 }
1216
1217 static int
1218 pvscsi_pre_save(void *opaque)
1219 {
1220     PVSCSIState *s = (PVSCSIState *) opaque;
1221
1222     trace_pvscsi_state("presave");
1223
1224     assert(QTAILQ_EMPTY(&s->pending_queue));
1225     assert(QTAILQ_EMPTY(&s->completion_queue));
1226
1227     return 0;
1228 }
1229
1230 static int
1231 pvscsi_post_load(void *opaque, int version_id)
1232 {
1233     trace_pvscsi_state("postload");
1234     return 0;
1235 }
1236
1237 static bool pvscsi_vmstate_need_pcie_device(void *opaque)
1238 {
1239     PVSCSIState *s = PVSCSI(opaque);
1240
1241     return !(s->compat_flags & PVSCSI_COMPAT_DISABLE_PCIE);
1242 }
1243
1244 static bool pvscsi_vmstate_test_pci_device(void *opaque, int version_id)
1245 {
1246     return !pvscsi_vmstate_need_pcie_device(opaque);
1247 }
1248
1249 static const VMStateDescription vmstate_pvscsi_pcie_device = {
1250     .name = "pvscsi/pcie",
1251     .needed = pvscsi_vmstate_need_pcie_device,
1252     .fields = (VMStateField[]) {
1253         VMSTATE_PCI_DEVICE(parent_obj, PVSCSIState),
1254         VMSTATE_END_OF_LIST()
1255     }
1256 };
1257
1258 static const VMStateDescription vmstate_pvscsi = {
1259     .name = "pvscsi",
1260     .version_id = 0,
1261     .minimum_version_id = 0,
1262     .pre_save = pvscsi_pre_save,
1263     .post_load = pvscsi_post_load,
1264     .fields = (VMStateField[]) {
1265         VMSTATE_STRUCT_TEST(parent_obj, PVSCSIState,
1266                             pvscsi_vmstate_test_pci_device, 0,
1267                             vmstate_pci_device, PCIDevice),
1268         VMSTATE_UINT8(msi_used, PVSCSIState),
1269         VMSTATE_UINT32(resetting, PVSCSIState),
1270         VMSTATE_UINT64(reg_interrupt_status, PVSCSIState),
1271         VMSTATE_UINT64(reg_interrupt_enabled, PVSCSIState),
1272         VMSTATE_UINT64(reg_command_status, PVSCSIState),
1273         VMSTATE_UINT64(curr_cmd, PVSCSIState),
1274         VMSTATE_UINT32(curr_cmd_data_cntr, PVSCSIState),
1275         VMSTATE_UINT32_ARRAY(curr_cmd_data, PVSCSIState,
1276                              ARRAY_SIZE(((PVSCSIState *)NULL)->curr_cmd_data)),
1277         VMSTATE_UINT8(rings_info_valid, PVSCSIState),
1278         VMSTATE_UINT8(msg_ring_info_valid, PVSCSIState),
1279         VMSTATE_UINT8(use_msg, PVSCSIState),
1280
1281         VMSTATE_UINT64(rings.rs_pa, PVSCSIState),
1282         VMSTATE_UINT32(rings.txr_len_mask, PVSCSIState),
1283         VMSTATE_UINT32(rings.rxr_len_mask, PVSCSIState),
1284         VMSTATE_UINT64_ARRAY(rings.req_ring_pages_pa, PVSCSIState,
1285                              PVSCSI_SETUP_RINGS_MAX_NUM_PAGES),
1286         VMSTATE_UINT64_ARRAY(rings.cmp_ring_pages_pa, PVSCSIState,
1287                              PVSCSI_SETUP_RINGS_MAX_NUM_PAGES),
1288         VMSTATE_UINT64(rings.consumed_ptr, PVSCSIState),
1289         VMSTATE_UINT64(rings.filled_cmp_ptr, PVSCSIState),
1290
1291         VMSTATE_END_OF_LIST()
1292     },
1293     .subsections = (const VMStateDescription*[]) {
1294         &vmstate_pvscsi_pcie_device,
1295         NULL
1296     }
1297 };
1298
1299 static Property pvscsi_properties[] = {
1300     DEFINE_PROP_UINT8("use_msg", PVSCSIState, use_msg, 1),
1301     DEFINE_PROP_BIT("x-old-pci-configuration", PVSCSIState, compat_flags,
1302                     PVSCSI_COMPAT_OLD_PCI_CONFIGURATION_BIT, false),
1303     DEFINE_PROP_BIT("x-disable-pcie", PVSCSIState, compat_flags,
1304                     PVSCSI_COMPAT_DISABLE_PCIE_BIT, false),
1305     DEFINE_PROP_END_OF_LIST(),
1306 };
1307
1308 static void pvscsi_realize(DeviceState *qdev, Error **errp)
1309 {
1310     PVSCSIClass *pvs_c = PVSCSI_GET_CLASS(qdev);
1311     PCIDevice *pci_dev = PCI_DEVICE(qdev);
1312     PVSCSIState *s = PVSCSI(qdev);
1313
1314     if (!(s->compat_flags & PVSCSI_COMPAT_DISABLE_PCIE)) {
1315         pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS;
1316     }
1317
1318     pvs_c->parent_dc_realize(qdev, errp);
1319 }
1320
1321 static void pvscsi_class_init(ObjectClass *klass, void *data)
1322 {
1323     DeviceClass *dc = DEVICE_CLASS(klass);
1324     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1325     PVSCSIClass *pvs_k = PVSCSI_CLASS(klass);
1326     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
1327
1328     k->realize = pvscsi_realizefn;
1329     k->exit = pvscsi_uninit;
1330     k->vendor_id = PCI_VENDOR_ID_VMWARE;
1331     k->device_id = PCI_DEVICE_ID_VMWARE_PVSCSI;
1332     k->class_id = PCI_CLASS_STORAGE_SCSI;
1333     k->subsystem_id = 0x1000;
1334     device_class_set_parent_realize(dc, pvscsi_realize,
1335                                     &pvs_k->parent_dc_realize);
1336     dc->reset = pvscsi_reset;
1337     dc->vmsd = &vmstate_pvscsi;
1338     device_class_set_props(dc, pvscsi_properties);
1339     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1340     hc->unplug = pvscsi_hot_unplug;
1341     hc->plug = pvscsi_hotplug;
1342 }
1343
1344 static const TypeInfo pvscsi_info = {
1345     .name          = TYPE_PVSCSI,
1346     .parent        = TYPE_PCI_DEVICE,
1347     .class_size    = sizeof(PVSCSIClass),
1348     .instance_size = sizeof(PVSCSIState),
1349     .class_init    = pvscsi_class_init,
1350     .interfaces = (InterfaceInfo[]) {
1351         { TYPE_HOTPLUG_HANDLER },
1352         { INTERFACE_PCIE_DEVICE },
1353         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
1354         { }
1355     }
1356 };
1357
1358 static void
1359 pvscsi_register_types(void)
1360 {
1361     type_register_static(&pvscsi_info);
1362 }
1363
1364 type_init(pvscsi_register_types);