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 "hw/scsi/scsi.h"
  29 #include <block/scsi.h>
  30 #include "hw/pci/msi.h"
  31 #include "vmw_pvscsi.h"
  32 #include "trace.h"
  33
  34
  35 #define PVSCSI_MSI_OFFSET        (0x50)
  36 #define PVSCSI_USE_64BIT         (true)
  37 #define PVSCSI_PER_VECTOR_MASK   (false)
  38
  39 #define PVSCSI_MAX_DEVS                   (64)
  40 #define PVSCSI_MSIX_NUM_VECTORS           (1)
  41
  42 #define PVSCSI_MAX_CMD_DATA_WORDS \
  43     (sizeof(PVSCSICmdDescSetupRings)/sizeof(uint32_t))
  44
  45 #define RS_GET_FIELD(rs_pa, field) \
  46     (ldl_le_phys(rs_pa + offsetof(struct PVSCSIRingsState, field)))
  47 #define RS_SET_FIELD(rs_pa, field, val) \
  48     (stl_le_phys(rs_pa + offsetof(struct PVSCSIRingsState, field), val))
  49
  50 #define TYPE_PVSCSI "pvscsi"
  51 #define PVSCSI(obj) OBJECT_CHECK(PVSCSIState, (obj), TYPE_PVSCSI)
  52
  53 typedef struct PVSCSIRingInfo {
  54     uint64_t            rs_pa;
  55     uint32_t            txr_len_mask;
  56     uint32_t            rxr_len_mask;
  57     uint32_t            msg_len_mask;
  58     uint64_t            req_ring_pages_pa[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
  59     uint64_t            cmp_ring_pages_pa[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
  60     uint64_t            msg_ring_pages_pa[PVSCSI_SETUP_MSG_RING_MAX_NUM_PAGES];
  61     uint64_t            consumed_ptr;
  62     uint64_t            filled_cmp_ptr;
  63     uint64_t            filled_msg_ptr;
  64 } PVSCSIRingInfo;
  65
  66 typedef struct PVSCSISGState {
  67     hwaddr elemAddr;
  68     hwaddr dataAddr;
  69     uint32_t resid;
  70 } PVSCSISGState;
  71
  72 typedef QTAILQ_HEAD(, PVSCSIRequest) PVSCSIRequestList;
  73
  74 typedef struct {
  75     PCIDevice parent_obj;
  76     MemoryRegion io_space;
  77     SCSIBus bus;
  78     QEMUBH *completion_worker;
  79     PVSCSIRequestList pending_queue;
  80     PVSCSIRequestList completion_queue;
  81
  82     uint64_t reg_interrupt_status;        /* Interrupt status register value */
  83     uint64_t reg_interrupt_enabled;       /* Interrupt mask register value   */
  84     uint64_t reg_command_status;          /* Command status register value   */
  85
  86     /* Command data adoption mechanism */
  87     uint64_t curr_cmd;                   /* Last command arrived             */
  88     uint32_t curr_cmd_data_cntr;         /* Amount of data for last command  */
  89
  90     /* Collector for current command data */
  91     uint32_t curr_cmd_data[PVSCSI_MAX_CMD_DATA_WORDS];
  92
  93     uint8_t rings_info_valid;            /* Whether data rings initialized   */
  94     uint8_t msg_ring_info_valid;         /* Whether message ring initialized */
  95     uint8_t use_msg;                     /* Whether to use message ring      */
  96
  97     uint8_t msi_used;    /* Whether MSI support was installed successfully   */
  98
  99     PVSCSIRingInfo rings;                /* Data transfer rings manager      */
 100     uint32_t resetting;                  /* Reset in progress                */
 101 } PVSCSIState;
 102
 103 typedef struct PVSCSIRequest {
 104     SCSIRequest *sreq;
 105     PVSCSIState *dev;
 106     uint8_t sense_key;
 107     uint8_t completed;
 108     int lun;
 109     QEMUSGList sgl;
 110     PVSCSISGState sg;
 111     struct PVSCSIRingReqDesc req;
 112     struct PVSCSIRingCmpDesc cmp;
 113     QTAILQ_ENTRY(PVSCSIRequest) next;
 114 } PVSCSIRequest;
 115
 116 /* Integer binary logarithm */
 117 static int
 118 pvscsi_log2(uint32_t input)
 119 {
 120     int log = 0;
 121     assert(input > 0);
 122     while (input >> ++log) {
 123     }
 124     return log;
 125 }
 126
 127 static void
 128 pvscsi_ring_init_data(PVSCSIRingInfo *m, PVSCSICmdDescSetupRings *ri)
 129 {
 130     int i;
 131     uint32_t txr_len_log2, rxr_len_log2;
 132     uint32_t req_ring_size, cmp_ring_size;
 133     m->rs_pa = ri->ringsStatePPN << VMW_PAGE_SHIFT;
 134
 135     req_ring_size = ri->reqRingNumPages * PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
 136     cmp_ring_size = ri->cmpRingNumPages * PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE;
 137     txr_len_log2 = pvscsi_log2(req_ring_size - 1);
 138     rxr_len_log2 = pvscsi_log2(cmp_ring_size - 1);
 139
 140     m->txr_len_mask = MASK(txr_len_log2);
 141     m->rxr_len_mask = MASK(rxr_len_log2);
 142
 143     m->consumed_ptr = 0;
 144     m->filled_cmp_ptr = 0;
 145
 146     for (i = 0; i < ri->reqRingNumPages; i++) {
 147         m->req_ring_pages_pa[i] = ri->reqRingPPNs[i] << VMW_PAGE_SHIFT;
 148     }
 149
 150     for (i = 0; i < ri->cmpRingNumPages; i++) {
 151         m->cmp_ring_pages_pa[i] = ri->cmpRingPPNs[i] << VMW_PAGE_SHIFT;
 152     }
 153
 154     RS_SET_FIELD(m->rs_pa, reqProdIdx, 0);
 155     RS_SET_FIELD(m->rs_pa, reqConsIdx, 0);
 156     RS_SET_FIELD(m->rs_pa, reqNumEntriesLog2, txr_len_log2);
 157
 158     RS_SET_FIELD(m->rs_pa, cmpProdIdx, 0);
 159     RS_SET_FIELD(m->rs_pa, cmpConsIdx, 0);
 160     RS_SET_FIELD(m->rs_pa, cmpNumEntriesLog2, rxr_len_log2);
 161
 162     trace_pvscsi_ring_init_data(txr_len_log2, rxr_len_log2);
 163
 164     /* Flush ring state page changes */
 165     smp_wmb();
 166 }
 167
 168 static void
 169 pvscsi_ring_init_msg(PVSCSIRingInfo *m, PVSCSICmdDescSetupMsgRing *ri)
 170 {
 171     int i;
 172     uint32_t len_log2;
 173     uint32_t ring_size;
 174
 175     ring_size = ri->numPages * PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE;
 176     len_log2 = pvscsi_log2(ring_size - 1);
 177
 178     m->msg_len_mask = MASK(len_log2);
 179
 180     m->filled_msg_ptr = 0;
 181
 182     for (i = 0; i < ri->numPages; i++) {
 183         m->msg_ring_pages_pa[i] = ri->ringPPNs[i] << VMW_PAGE_SHIFT;
 184     }
 185
 186     RS_SET_FIELD(m->rs_pa, msgProdIdx, 0);
 187     RS_SET_FIELD(m->rs_pa, msgConsIdx, 0);
 188     RS_SET_FIELD(m->rs_pa, msgNumEntriesLog2, len_log2);
 189
 190     trace_pvscsi_ring_init_msg(len_log2);
 191
 192     /* Flush ring state page changes */
 193     smp_wmb();
 194 }
 195
 196 static void
 197 pvscsi_ring_cleanup(PVSCSIRingInfo *mgr)
 198 {
 199     mgr->rs_pa = 0;
 200     mgr->txr_len_mask = 0;
 201     mgr->rxr_len_mask = 0;
 202     mgr->msg_len_mask = 0;
 203     mgr->consumed_ptr = 0;
 204     mgr->filled_cmp_ptr = 0;
 205     mgr->filled_msg_ptr = 0;
 206     memset(mgr->req_ring_pages_pa, 0, sizeof(mgr->req_ring_pages_pa));
 207     memset(mgr->cmp_ring_pages_pa, 0, sizeof(mgr->cmp_ring_pages_pa));
 208     memset(mgr->msg_ring_pages_pa, 0, sizeof(mgr->msg_ring_pages_pa));
 209 }
 210
 211 static hwaddr
 212 pvscsi_ring_pop_req_descr(PVSCSIRingInfo *mgr)
 213 {
 214     uint32_t ready_ptr = RS_GET_FIELD(mgr->rs_pa, reqProdIdx);
 215
 216     if (ready_ptr != mgr->consumed_ptr) {
 217         uint32_t next_ready_ptr =
 218             mgr->consumed_ptr++ & mgr->txr_len_mask;
 219         uint32_t next_ready_page =
 220             next_ready_ptr / PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
 221         uint32_t inpage_idx =
 222             next_ready_ptr % PVSCSI_MAX_NUM_REQ_ENTRIES_PER_PAGE;
 223
 224         return mgr->req_ring_pages_pa[next_ready_page] +
 225                inpage_idx * sizeof(PVSCSIRingReqDesc);
 226     } else {
 227         return 0;
 228     }
 229 }
 230
 231 static void
 232 pvscsi_ring_flush_req(PVSCSIRingInfo *mgr)
 233 {
 234     RS_SET_FIELD(mgr->rs_pa, reqConsIdx, mgr->consumed_ptr);
 235 }
 236
 237 static hwaddr
 238 pvscsi_ring_pop_cmp_descr(PVSCSIRingInfo *mgr)
 239 {
 240     /*
 241      * According to Linux driver code it explicitly verifies that number
 242      * of requests being processed by device is less then the size of
 243      * completion queue, so device may omit completion queue overflow
 244      * conditions check. We assume that this is true for other (Windows)
 245      * drivers as well.
 246      */
 247
 248     uint32_t free_cmp_ptr =
 249         mgr->filled_cmp_ptr++ & mgr->rxr_len_mask;
 250     uint32_t free_cmp_page =
 251         free_cmp_ptr / PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE;
 252     uint32_t inpage_idx =
 253         free_cmp_ptr % PVSCSI_MAX_NUM_CMP_ENTRIES_PER_PAGE;
 254     return mgr->cmp_ring_pages_pa[free_cmp_page] +
 255            inpage_idx * sizeof(PVSCSIRingCmpDesc);
 256 }
 257
 258 static hwaddr
 259 pvscsi_ring_pop_msg_descr(PVSCSIRingInfo *mgr)
 260 {
 261     uint32_t free_msg_ptr =
 262         mgr->filled_msg_ptr++ & mgr->msg_len_mask;
 263     uint32_t free_msg_page =
 264         free_msg_ptr / PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE;
 265     uint32_t inpage_idx =
 266         free_msg_ptr % PVSCSI_MAX_NUM_MSG_ENTRIES_PER_PAGE;
 267     return mgr->msg_ring_pages_pa[free_msg_page] +
 268            inpage_idx * sizeof(PVSCSIRingMsgDesc);
 269 }
 270
 271 static void
 272 pvscsi_ring_flush_cmp(PVSCSIRingInfo *mgr)
 273 {
 274     /* Flush descriptor changes */
 275     smp_wmb();
 276
 277     trace_pvscsi_ring_flush_cmp(mgr->filled_cmp_ptr);
 278
 279     RS_SET_FIELD(mgr->rs_pa, cmpProdIdx, mgr->filled_cmp_ptr);
 280 }
 281
 282 static bool
 283 pvscsi_ring_msg_has_room(PVSCSIRingInfo *mgr)
 284 {
 285     uint32_t prodIdx = RS_GET_FIELD(mgr->rs_pa, msgProdIdx);
 286     uint32_t consIdx = RS_GET_FIELD(mgr->rs_pa, msgConsIdx);
 287
 288     return (prodIdx - consIdx) < (mgr->msg_len_mask + 1);
 289 }
 290
 291 static void
 292 pvscsi_ring_flush_msg(PVSCSIRingInfo *mgr)
 293 {
 294     /* Flush descriptor changes */
 295     smp_wmb();
 296
 297     trace_pvscsi_ring_flush_msg(mgr->filled_msg_ptr);
 298
 299     RS_SET_FIELD(mgr->rs_pa, msgProdIdx, mgr->filled_msg_ptr);
 300 }
 301
 302 static void
 303 pvscsi_reset_state(PVSCSIState *s)
 304 {
 305     s->curr_cmd = PVSCSI_CMD_FIRST;
 306     s->curr_cmd_data_cntr = 0;
 307     s->reg_command_status = PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
 308     s->reg_interrupt_status = 0;
 309     pvscsi_ring_cleanup(&s->rings);
 310     s->rings_info_valid = FALSE;
 311     s->msg_ring_info_valid = FALSE;
 312     QTAILQ_INIT(&s->pending_queue);
 313     QTAILQ_INIT(&s->completion_queue);
 314 }
 315
 316 static void
 317 pvscsi_update_irq_status(PVSCSIState *s)
 318 {
 319     PCIDevice *d = PCI_DEVICE(s);
 320     bool should_raise = s->reg_interrupt_enabled & s->reg_interrupt_status;
 321
 322     trace_pvscsi_update_irq_level(should_raise, s->reg_interrupt_enabled,
 323                                   s->reg_interrupt_status);
 324
 325     if (s->msi_used && msi_enabled(d)) {
 326         if (should_raise) {
 327             trace_pvscsi_update_irq_msi();
 328             msi_notify(d, PVSCSI_VECTOR_COMPLETION);
 329         }
 330         return;
 331     }
 332
 333     qemu_set_irq(d->irq[0], !!should_raise);
 334 }
 335
 336 static void
 337 pvscsi_raise_completion_interrupt(PVSCSIState *s)
 338 {
 339     s->reg_interrupt_status |= PVSCSI_INTR_CMPL_0;
 340
 341     /* Memory barrier to flush interrupt status register changes*/
 342     smp_wmb();
 343
 344     pvscsi_update_irq_status(s);
 345 }
 346
 347 static void
 348 pvscsi_raise_message_interrupt(PVSCSIState *s)
 349 {
 350     s->reg_interrupt_status |= PVSCSI_INTR_MSG_0;
 351
 352     /* Memory barrier to flush interrupt status register changes*/
 353     smp_wmb();
 354
 355     pvscsi_update_irq_status(s);
 356 }
 357
 358 static void
 359 pvscsi_cmp_ring_put(PVSCSIState *s, struct PVSCSIRingCmpDesc *cmp_desc)
 360 {
 361     hwaddr cmp_descr_pa;
 362
 363     cmp_descr_pa = pvscsi_ring_pop_cmp_descr(&s->rings);
 364     trace_pvscsi_cmp_ring_put(cmp_descr_pa);
 365     cpu_physical_memory_write(cmp_descr_pa, (void *)cmp_desc,
 366                               sizeof(*cmp_desc));
 367 }
 368
 369 static void
 370 pvscsi_msg_ring_put(PVSCSIState *s, struct PVSCSIRingMsgDesc *msg_desc)
 371 {
 372     hwaddr msg_descr_pa;
 373
 374     msg_descr_pa = pvscsi_ring_pop_msg_descr(&s->rings);
 375     trace_pvscsi_msg_ring_put(msg_descr_pa);
 376     cpu_physical_memory_write(msg_descr_pa, (void *)msg_desc,
 377                               sizeof(*msg_desc));
 378 }
 379
 380 static void
 381 pvscsi_process_completion_queue(void *opaque)
 382 {
 383     PVSCSIState *s = opaque;
 384     PVSCSIRequest *pvscsi_req;
 385     bool has_completed = false;
 386
 387     while (!QTAILQ_EMPTY(&s->completion_queue)) {
 388         pvscsi_req = QTAILQ_FIRST(&s->completion_queue);
 389         QTAILQ_REMOVE(&s->completion_queue, pvscsi_req, next);
 390         pvscsi_cmp_ring_put(s, &pvscsi_req->cmp);
 391         g_free(pvscsi_req);
 392         has_completed = true;
 393     }
 394
 395     if (has_completed) {
 396         pvscsi_ring_flush_cmp(&s->rings);
 397         pvscsi_raise_completion_interrupt(s);
 398     }
 399 }
 400
 401 static void
 402 pvscsi_reset_adapter(PVSCSIState *s)
 403 {
 404     s->resetting++;
 405     qbus_reset_all_fn(&s->bus);
 406     s->resetting--;
 407     pvscsi_process_completion_queue(s);
 408     assert(QTAILQ_EMPTY(&s->pending_queue));
 409     pvscsi_reset_state(s);
 410 }
 411
 412 static void
 413 pvscsi_schedule_completion_processing(PVSCSIState *s)
 414 {
 415     /* Try putting more complete requests on the ring. */
 416     if (!QTAILQ_EMPTY(&s->completion_queue)) {
 417         qemu_bh_schedule(s->completion_worker);
 418     }
 419 }
 420
 421 static void
 422 pvscsi_complete_request(PVSCSIState *s, PVSCSIRequest *r)
 423 {
 424     assert(!r->completed);
 425
 426     trace_pvscsi_complete_request(r->cmp.context, r->cmp.dataLen,
 427                                   r->sense_key);
 428     if (r->sreq != NULL) {
 429         scsi_req_unref(r->sreq);
 430         r->sreq = NULL;
 431     }
 432     r->completed = 1;
 433     QTAILQ_REMOVE(&s->pending_queue, r, next);
 434     QTAILQ_INSERT_TAIL(&s->completion_queue, r, next);
 435     pvscsi_schedule_completion_processing(s);
 436 }
 437
 438 static QEMUSGList *pvscsi_get_sg_list(SCSIRequest *r)
 439 {
 440     PVSCSIRequest *req = r->hba_private;
 441
 442     trace_pvscsi_get_sg_list(req->sgl.nsg, req->sgl.size);
 443
 444     return &req->sgl;
 445 }
 446
 447 static void
 448 pvscsi_get_next_sg_elem(PVSCSISGState *sg)
 449 {
 450     struct PVSCSISGElement elem;
 451
 452     cpu_physical_memory_read(sg->elemAddr, (void *)&elem, sizeof(elem));
 453     if ((elem.flags & ~PVSCSI_KNOWN_FLAGS) != 0) {
 454         /*
 455             * There is PVSCSI_SGE_FLAG_CHAIN_ELEMENT flag described in
 456             * header file but its value is unknown. This flag requires
 457             * additional processing, so we put warning here to catch it
 458             * some day and make proper implementation
 459             */
 460         trace_pvscsi_get_next_sg_elem(elem.flags);
 461     }
 462
 463     sg->elemAddr += sizeof(elem);
 464     sg->dataAddr = elem.addr;
 465     sg->resid = elem.length;
 466 }
 467
 468 static void
 469 pvscsi_write_sense(PVSCSIRequest *r, uint8_t *sense, int len)
 470 {
 471     r->cmp.senseLen = MIN(r->req.senseLen, len);
 472     r->sense_key = sense[(sense[0] & 2) ? 1 : 2];
 473     cpu_physical_memory_write(r->req.senseAddr, sense, r->cmp.senseLen);
 474 }
 475
 476 static void
 477 pvscsi_command_complete(SCSIRequest *req, uint32_t status, size_t resid)
 478 {
 479     PVSCSIRequest *pvscsi_req = req->hba_private;
 480     PVSCSIState *s = pvscsi_req->dev;
 481
 482     if (!pvscsi_req) {
 483         trace_pvscsi_command_complete_not_found(req->tag);
 484         return;
 485     }
 486
 487     if (resid) {
 488         /* Short transfer.  */
 489         trace_pvscsi_command_complete_data_run();
 490         pvscsi_req->cmp.hostStatus = BTSTAT_DATARUN;
 491     }
 492
 493     pvscsi_req->cmp.scsiStatus = status;
 494     if (pvscsi_req->cmp.scsiStatus == CHECK_CONDITION) {
 495         uint8_t sense[SCSI_SENSE_BUF_SIZE];
 496         int sense_len =
 497             scsi_req_get_sense(pvscsi_req->sreq, sense, sizeof(sense));
 498
 499         trace_pvscsi_command_complete_sense_len(sense_len);
 500         pvscsi_write_sense(pvscsi_req, sense, sense_len);
 501     }
 502     qemu_sglist_destroy(&pvscsi_req->sgl);
 503     pvscsi_complete_request(s, pvscsi_req);
 504 }
 505
 506 static void
 507 pvscsi_send_msg(PVSCSIState *s, SCSIDevice *dev, uint32_t msg_type)
 508 {
 509     if (s->msg_ring_info_valid && pvscsi_ring_msg_has_room(&s->rings)) {
 510         PVSCSIMsgDescDevStatusChanged msg = {0};
 511
 512         msg.type = msg_type;
 513         msg.bus = dev->channel;
 514         msg.target = dev->id;
 515         msg.lun[1] = dev->lun;
 516
 517         pvscsi_msg_ring_put(s, (PVSCSIRingMsgDesc *)&msg);
 518         pvscsi_ring_flush_msg(&s->rings);
 519         pvscsi_raise_message_interrupt(s);
 520     }
 521 }
 522
 523 static void
 524 pvscsi_hotplug(SCSIBus *bus, SCSIDevice *dev)
 525 {
 526     PVSCSIState *s = container_of(bus, PVSCSIState, bus);
 527     pvscsi_send_msg(s, dev, PVSCSI_MSG_DEV_ADDED);
 528 }
 529
 530 static void
 531 pvscsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev)
 532 {
 533     PVSCSIState *s = container_of(bus, PVSCSIState, bus);
 534     pvscsi_send_msg(s, dev, PVSCSI_MSG_DEV_REMOVED);
 535 }
 536
 537 static void
 538 pvscsi_request_cancelled(SCSIRequest *req)
 539 {
 540     PVSCSIRequest *pvscsi_req = req->hba_private;
 541     PVSCSIState *s = pvscsi_req->dev;
 542
 543     if (pvscsi_req->completed) {
 544         return;
 545     }
 546
 547    if (pvscsi_req->dev->resetting) {
 548        pvscsi_req->cmp.hostStatus = BTSTAT_BUSRESET;
 549     } else {
 550        pvscsi_req->cmp.hostStatus = BTSTAT_ABORTQUEUE;
 551     }
 552
 553     pvscsi_complete_request(s, pvscsi_req);
 554 }
 555
 556 static SCSIDevice*
 557 pvscsi_device_find(PVSCSIState *s, int channel, int target,
 558                    uint8_t *requested_lun, uint8_t *target_lun)
 559 {
 560     if (requested_lun[0] || requested_lun[2] || requested_lun[3] ||
 561         requested_lun[4] || requested_lun[5] || requested_lun[6] ||
 562         requested_lun[7] || (target > PVSCSI_MAX_DEVS)) {
 563         return NULL;
 564     } else {
 565         *target_lun = requested_lun[1];
 566         return scsi_device_find(&s->bus, channel, target, *target_lun);
 567     }
 568 }
 569
 570 static PVSCSIRequest *
 571 pvscsi_queue_pending_descriptor(PVSCSIState *s, SCSIDevice **d,
 572                                 struct PVSCSIRingReqDesc *descr)
 573 {
 574     PVSCSIRequest *pvscsi_req;
 575     uint8_t lun;
 576
 577     pvscsi_req = g_malloc0(sizeof(*pvscsi_req));
 578     pvscsi_req->dev = s;
 579     pvscsi_req->req = *descr;
 580     pvscsi_req->cmp.context = pvscsi_req->req.context;
 581     QTAILQ_INSERT_TAIL(&s->pending_queue, pvscsi_req, next);
 582
 583     *d = pvscsi_device_find(s, descr->bus, descr->target, descr->lun, &lun);
 584     if (*d) {
 585         pvscsi_req->lun = lun;
 586     }
 587
 588     return pvscsi_req;
 589 }
 590
 591 static void
 592 pvscsi_convert_sglist(PVSCSIRequest *r)
 593 {
 594     int chunk_size;
 595     uint64_t data_length = r->req.dataLen;
 596     PVSCSISGState sg = r->sg;
 597     while (data_length) {
 598         while (!sg.resid) {
 599             pvscsi_get_next_sg_elem(&sg);
 600             trace_pvscsi_convert_sglist(r->req.context, r->sg.dataAddr,
 601                                         r->sg.resid);
 602         }
 603         assert(data_length > 0);
 604         chunk_size = MIN((unsigned) data_length, sg.resid);
 605         if (chunk_size) {
 606             qemu_sglist_add(&r->sgl, sg.dataAddr, chunk_size);
 607         }
 608
 609         sg.dataAddr += chunk_size;
 610         data_length -= chunk_size;
 611         sg.resid -= chunk_size;
 612     }
 613 }
 614
 615 static void
 616 pvscsi_build_sglist(PVSCSIState *s, PVSCSIRequest *r)
 617 {
 618     PCIDevice *d = PCI_DEVICE(s);
 619
 620     pci_dma_sglist_init(&r->sgl, d, 1);
 621     if (r->req.flags & PVSCSI_FLAG_CMD_WITH_SG_LIST) {
 622         pvscsi_convert_sglist(r);
 623     } else {
 624         qemu_sglist_add(&r->sgl, r->req.dataAddr, r->req.dataLen);
 625     }
 626 }
 627
 628 static void
 629 pvscsi_process_request_descriptor(PVSCSIState *s,
 630                                   struct PVSCSIRingReqDesc *descr)
 631 {
 632     SCSIDevice *d;
 633     PVSCSIRequest *r = pvscsi_queue_pending_descriptor(s, &d, descr);
 634     int64_t n;
 635
 636     trace_pvscsi_process_req_descr(descr->cdb[0], descr->context);
 637
 638     if (!d) {
 639         r->cmp.hostStatus = BTSTAT_SELTIMEO;
 640         trace_pvscsi_process_req_descr_unknown_device();
 641         pvscsi_complete_request(s, r);
 642         return;
 643     }
 644
 645     if (descr->flags & PVSCSI_FLAG_CMD_WITH_SG_LIST) {
 646         r->sg.elemAddr = descr->dataAddr;
 647     }
 648
 649     r->sreq = scsi_req_new(d, descr->context, r->lun, descr->cdb, r);
 650     if (r->sreq->cmd.mode == SCSI_XFER_FROM_DEV &&
 651         (descr->flags & PVSCSI_FLAG_CMD_DIR_TODEVICE)) {
 652         r->cmp.hostStatus = BTSTAT_BADMSG;
 653         trace_pvscsi_process_req_descr_invalid_dir();
 654         scsi_req_cancel(r->sreq);
 655         return;
 656     }
 657     if (r->sreq->cmd.mode == SCSI_XFER_TO_DEV &&
 658         (descr->flags & PVSCSI_FLAG_CMD_DIR_TOHOST)) {
 659         r->cmp.hostStatus = BTSTAT_BADMSG;
 660         trace_pvscsi_process_req_descr_invalid_dir();
 661         scsi_req_cancel(r->sreq);
 662         return;
 663     }
 664
 665     pvscsi_build_sglist(s, r);
 666     n = scsi_req_enqueue(r->sreq);
 667
 668     if (n) {
 669         scsi_req_continue(r->sreq);
 670     }
 671 }
 672
 673 static void
 674 pvscsi_process_io(PVSCSIState *s)
 675 {
 676     PVSCSIRingReqDesc descr;
 677     hwaddr next_descr_pa;
 678
 679     assert(s->rings_info_valid);
 680     while ((next_descr_pa = pvscsi_ring_pop_req_descr(&s->rings)) != 0) {
 681
 682         /* Only read after production index verification */
 683         smp_rmb();
 684
 685         trace_pvscsi_process_io(next_descr_pa);
 686         cpu_physical_memory_read(next_descr_pa, &descr, sizeof(descr));
 687         pvscsi_process_request_descriptor(s, &descr);
 688     }
 689
 690     pvscsi_ring_flush_req(&s->rings);
 691 }
 692
 693 static void
 694 pvscsi_dbg_dump_tx_rings_config(PVSCSICmdDescSetupRings *rc)
 695 {
 696     int i;
 697     trace_pvscsi_tx_rings_ppn("Rings State", rc->ringsStatePPN);
 698
 699     trace_pvscsi_tx_rings_num_pages("Request Ring", rc->reqRingNumPages);
 700     for (i = 0; i < rc->reqRingNumPages; i++) {
 701         trace_pvscsi_tx_rings_ppn("Request Ring", rc->reqRingPPNs[i]);
 702     }
 703
 704     trace_pvscsi_tx_rings_num_pages("Confirm Ring", rc->cmpRingNumPages);
 705     for (i = 0; i < rc->cmpRingNumPages; i++) {
 706         trace_pvscsi_tx_rings_ppn("Confirm Ring", rc->reqRingPPNs[i]);
 707     }
 708 }
 709
 710 static uint64_t
 711 pvscsi_on_cmd_config(PVSCSIState *s)
 712 {
 713     trace_pvscsi_on_cmd_noimpl("PVSCSI_CMD_CONFIG");
 714     return PVSCSI_COMMAND_PROCESSING_FAILED;
 715 }
 716
 717 static uint64_t
 718 pvscsi_on_cmd_unplug(PVSCSIState *s)
 719 {
 720     trace_pvscsi_on_cmd_noimpl("PVSCSI_CMD_DEVICE_UNPLUG");
 721     return PVSCSI_COMMAND_PROCESSING_FAILED;
 722 }
 723
 724 static uint64_t
 725 pvscsi_on_issue_scsi(PVSCSIState *s)
 726 {
 727     trace_pvscsi_on_cmd_noimpl("PVSCSI_CMD_ISSUE_SCSI");
 728     return PVSCSI_COMMAND_PROCESSING_FAILED;
 729 }
 730
 731 static uint64_t
 732 pvscsi_on_cmd_setup_rings(PVSCSIState *s)
 733 {
 734     PVSCSICmdDescSetupRings *rc =
 735         (PVSCSICmdDescSetupRings *) s->curr_cmd_data;
 736
 737     trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_SETUP_RINGS");
 738
 739     pvscsi_dbg_dump_tx_rings_config(rc);
 740     pvscsi_ring_init_data(&s->rings, rc);
 741     s->rings_info_valid = TRUE;
 742     return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
 743 }
 744
 745 static uint64_t
 746 pvscsi_on_cmd_abort(PVSCSIState *s)
 747 {
 748     PVSCSICmdDescAbortCmd *cmd = (PVSCSICmdDescAbortCmd *) s->curr_cmd_data;
 749     PVSCSIRequest *r, *next;
 750
 751     trace_pvscsi_on_cmd_abort(cmd->context, cmd->target);
 752
 753     QTAILQ_FOREACH_SAFE(r, &s->pending_queue, next, next) {
 754         if (r->req.context == cmd->context) {
 755             break;
 756         }
 757     }
 758     if (r) {
 759         assert(!r->completed);
 760         r->cmp.hostStatus = BTSTAT_ABORTQUEUE;
 761         scsi_req_cancel(r->sreq);
 762     }
 763
 764     return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
 765 }
 766
 767 static uint64_t
 768 pvscsi_on_cmd_unknown(PVSCSIState *s)
 769 {
 770     trace_pvscsi_on_cmd_unknown_data(s->curr_cmd_data[0]);
 771     return PVSCSI_COMMAND_PROCESSING_FAILED;
 772 }
 773
 774 static uint64_t
 775 pvscsi_on_cmd_reset_device(PVSCSIState *s)
 776 {
 777     uint8_t target_lun = 0;
 778     struct PVSCSICmdDescResetDevice *cmd =
 779         (struct PVSCSICmdDescResetDevice *) s->curr_cmd_data;
 780     SCSIDevice *sdev;
 781
 782     sdev = pvscsi_device_find(s, 0, cmd->target, cmd->lun, &target_lun);
 783
 784     trace_pvscsi_on_cmd_reset_dev(cmd->target, (int) target_lun, sdev);
 785
 786     if (sdev != NULL) {
 787         s->resetting++;
 788         device_reset(&sdev->qdev);
 789         s->resetting--;
 790         return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
 791     }
 792
 793     return PVSCSI_COMMAND_PROCESSING_FAILED;
 794 }
 795
 796 static uint64_t
 797 pvscsi_on_cmd_reset_bus(PVSCSIState *s)
 798 {
 799     trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_RESET_BUS");
 800
 801     s->resetting++;
 802     qbus_reset_all_fn(&s->bus);
 803     s->resetting--;
 804     return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
 805 }
 806
 807 static uint64_t
 808 pvscsi_on_cmd_setup_msg_ring(PVSCSIState *s)
 809 {
 810     PVSCSICmdDescSetupMsgRing *rc =
 811         (PVSCSICmdDescSetupMsgRing *) s->curr_cmd_data;
 812
 813     trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_SETUP_MSG_RING");
 814
 815     if (!s->use_msg) {
 816         return PVSCSI_COMMAND_PROCESSING_FAILED;
 817     }
 818
 819     if (s->rings_info_valid) {
 820         pvscsi_ring_init_msg(&s->rings, rc);
 821         s->msg_ring_info_valid = TRUE;
 822     }
 823     return sizeof(PVSCSICmdDescSetupMsgRing) / sizeof(uint32_t);
 824 }
 825
 826 static uint64_t
 827 pvscsi_on_cmd_adapter_reset(PVSCSIState *s)
 828 {
 829     trace_pvscsi_on_cmd_arrived("PVSCSI_CMD_ADAPTER_RESET");
 830
 831     pvscsi_reset_adapter(s);
 832     return PVSCSI_COMMAND_PROCESSING_SUCCEEDED;
 833 }
 834
 835 static const struct {
 836     int       data_size;
 837     uint64_t  (*handler_fn)(PVSCSIState *s);
 838 } pvscsi_commands[] = {
 839     [PVSCSI_CMD_FIRST] = {
 840         .data_size = 0,
 841         .handler_fn = pvscsi_on_cmd_unknown,
 842     },
 843
 844     /* Not implemented, data size defined based on what arrives on windows */
 845     [PVSCSI_CMD_CONFIG] = {
 846         .data_size = 6 * sizeof(uint32_t),
 847         .handler_fn = pvscsi_on_cmd_config,
 848     },
 849
 850     /* Command not implemented, data size is unknown */
 851     [PVSCSI_CMD_ISSUE_SCSI] = {
 852         .data_size = 0,
 853         .handler_fn = pvscsi_on_issue_scsi,
 854     },
 855
 856     /* Command not implemented, data size is unknown */
 857     [PVSCSI_CMD_DEVICE_UNPLUG] = {
 858         .data_size = 0,
 859         .handler_fn = pvscsi_on_cmd_unplug,
 860     },
 861
 862     [PVSCSI_CMD_SETUP_RINGS] = {
 863         .data_size = sizeof(PVSCSICmdDescSetupRings),
 864         .handler_fn = pvscsi_on_cmd_setup_rings,
 865     },
 866
 867     [PVSCSI_CMD_RESET_DEVICE] = {
 868         .data_size = sizeof(struct PVSCSICmdDescResetDevice),
 869         .handler_fn = pvscsi_on_cmd_reset_device,
 870     },
 871
 872     [PVSCSI_CMD_RESET_BUS] = {
 873         .data_size = 0,
 874         .handler_fn = pvscsi_on_cmd_reset_bus,
 875     },
 876
 877     [PVSCSI_CMD_SETUP_MSG_RING] = {
 878         .data_size = sizeof(PVSCSICmdDescSetupMsgRing),
 879         .handler_fn = pvscsi_on_cmd_setup_msg_ring,
 880     },
 881
 882     [PVSCSI_CMD_ADAPTER_RESET] = {
 883         .data_size = 0,
 884         .handler_fn = pvscsi_on_cmd_adapter_reset,
 885     },
 886
 887     [PVSCSI_CMD_ABORT_CMD] = {
 888         .data_size = sizeof(struct PVSCSICmdDescAbortCmd),
 889         .handler_fn = pvscsi_on_cmd_abort,
 890     },
 891 };
 892
 893 static void
 894 pvscsi_do_command_processing(PVSCSIState *s)
 895 {
 896     size_t bytes_arrived = s->curr_cmd_data_cntr * sizeof(uint32_t);
 897
 898     assert(s->curr_cmd < PVSCSI_CMD_LAST);
 899     if (bytes_arrived >= pvscsi_commands[s->curr_cmd].data_size) {
 900         s->reg_command_status = pvscsi_commands[s->curr_cmd].handler_fn(s);
 901         s->curr_cmd = PVSCSI_CMD_FIRST;
 902         s->curr_cmd_data_cntr   = 0;
 903     }
 904 }
 905
 906 static void
 907 pvscsi_on_command_data(PVSCSIState *s, uint32_t value)
 908 {
 909     size_t bytes_arrived = s->curr_cmd_data_cntr * sizeof(uint32_t);
 910
 911     assert(bytes_arrived < sizeof(s->curr_cmd_data));
 912     s->curr_cmd_data[s->curr_cmd_data_cntr++] = value;
 913
 914     pvscsi_do_command_processing(s);
 915 }
 916
 917 static void
 918 pvscsi_on_command(PVSCSIState *s, uint64_t cmd_id)
 919 {
 920     if ((cmd_id > PVSCSI_CMD_FIRST) && (cmd_id < PVSCSI_CMD_LAST)) {
 921         s->curr_cmd = cmd_id;
 922     } else {
 923         s->curr_cmd = PVSCSI_CMD_FIRST;
 924         trace_pvscsi_on_cmd_unknown(cmd_id);
 925     }
 926
 927     s->curr_cmd_data_cntr = 0;
 928     s->reg_command_status = PVSCSI_COMMAND_NOT_ENOUGH_DATA;
 929
 930     pvscsi_do_command_processing(s);
 931 }
 932
 933 static void
 934 pvscsi_io_write(void *opaque, hwaddr addr,
 935                 uint64_t val, unsigned size)
 936 {
 937     PVSCSIState *s = opaque;
 938
 939     switch (addr) {
 940     case PVSCSI_REG_OFFSET_COMMAND:
 941         pvscsi_on_command(s, val);
 942         break;
 943
 944     case PVSCSI_REG_OFFSET_COMMAND_DATA:
 945         pvscsi_on_command_data(s, (uint32_t) val);
 946         break;
 947
 948     case PVSCSI_REG_OFFSET_INTR_STATUS:
 949         trace_pvscsi_io_write("PVSCSI_REG_OFFSET_INTR_STATUS", val);
 950         s->reg_interrupt_status &= ~val;
 951         pvscsi_update_irq_status(s);
 952         pvscsi_schedule_completion_processing(s);
 953         break;
 954
 955     case PVSCSI_REG_OFFSET_INTR_MASK:
 956         trace_pvscsi_io_write("PVSCSI_REG_OFFSET_INTR_MASK", val);
 957         s->reg_interrupt_enabled = val;
 958         pvscsi_update_irq_status(s);
 959         break;
 960
 961     case PVSCSI_REG_OFFSET_KICK_NON_RW_IO:
 962         trace_pvscsi_io_write("PVSCSI_REG_OFFSET_KICK_NON_RW_IO", val);
 963         pvscsi_process_io(s);
 964         break;
 965
 966     case PVSCSI_REG_OFFSET_KICK_RW_IO:
 967         trace_pvscsi_io_write("PVSCSI_REG_OFFSET_KICK_RW_IO", val);
 968         pvscsi_process_io(s);
 969         break;
 970
 971     case PVSCSI_REG_OFFSET_DEBUG:
 972         trace_pvscsi_io_write("PVSCSI_REG_OFFSET_DEBUG", val);
 973         break;
 974
 975     default:
 976         trace_pvscsi_io_write_unknown(addr, size, val);
 977         break;
 978     }
 979
 980 }
 981
 982 static uint64_t
 983 pvscsi_io_read(void *opaque, hwaddr addr, unsigned size)
 984 {
 985     PVSCSIState *s = opaque;
 986
 987     switch (addr) {
 988     case PVSCSI_REG_OFFSET_INTR_STATUS:
 989         trace_pvscsi_io_read("PVSCSI_REG_OFFSET_INTR_STATUS",
 990                              s->reg_interrupt_status);
 991         return s->reg_interrupt_status;
 992
 993     case PVSCSI_REG_OFFSET_INTR_MASK:
 994         trace_pvscsi_io_read("PVSCSI_REG_OFFSET_INTR_MASK",
 995                              s->reg_interrupt_status);
 996         return s->reg_interrupt_enabled;
 997
 998     case PVSCSI_REG_OFFSET_COMMAND_STATUS:
 999         trace_pvscsi_io_read("PVSCSI_REG_OFFSET_COMMAND_STATUS",
1000                              s->reg_interrupt_status);
1001         return s->reg_command_status;
1002
1003     default:
1004         trace_pvscsi_io_read_unknown(addr, size);
1005         return 0;
1006     }
1007 }
1008
1009
1010 static bool
1011 pvscsi_init_msi(PVSCSIState *s)
1012 {
1013     int res;
1014     PCIDevice *d = PCI_DEVICE(s);
1015
1016     res = msi_init(d, PVSCSI_MSI_OFFSET, PVSCSI_MSIX_NUM_VECTORS,
1017                    PVSCSI_USE_64BIT, PVSCSI_PER_VECTOR_MASK);
1018     if (res < 0) {
1019         trace_pvscsi_init_msi_fail(res);
1020         s->msi_used = false;
1021     } else {
1022         s->msi_used = true;
1023     }
1024
1025     return s->msi_used;
1026 }
1027
1028 static void
1029 pvscsi_cleanup_msi(PVSCSIState *s)
1030 {
1031     PCIDevice *d = PCI_DEVICE(s);
1032
1033     if (s->msi_used) {
1034         msi_uninit(d);
1035     }
1036 }
1037
1038 static const MemoryRegionOps pvscsi_ops = {
1039         .read = pvscsi_io_read,
1040         .write = pvscsi_io_write,
1041         .endianness = DEVICE_LITTLE_ENDIAN,
1042         .impl = {
1043                 .min_access_size = 4,
1044                 .max_access_size = 4,
1045         },
1046 };
1047
1048 static const struct SCSIBusInfo pvscsi_scsi_info = {
1049         .tcq = true,
1050         .max_target = PVSCSI_MAX_DEVS,
1051         .max_channel = 0,
1052         .max_lun = 0,
1053
1054         .get_sg_list = pvscsi_get_sg_list,
1055         .complete = pvscsi_command_complete,
1056         .cancel = pvscsi_request_cancelled,
1057         .hotplug = pvscsi_hotplug,
1058         .hot_unplug = pvscsi_hot_unplug,
1059 };
1060
1061 static int
1062 pvscsi_init(PCIDevice *pci_dev)
1063 {
1064     PVSCSIState *s = PVSCSI(pci_dev);
1065
1066     trace_pvscsi_state("init");
1067
1068     /* PCI subsystem ID */
1069     pci_dev->config[PCI_SUBSYSTEM_ID] = 0x00;
1070     pci_dev->config[PCI_SUBSYSTEM_ID + 1] = 0x10;
1071
1072     /* PCI latency timer = 255 */
1073     pci_dev->config[PCI_LATENCY_TIMER] = 0xff;
1074
1075     /* Interrupt pin A */
1076     pci_config_set_interrupt_pin(pci_dev->config, 1);
1077
1078     memory_region_init_io(&s->io_space, NULL, &pvscsi_ops, s,
1079                           "pvscsi-io", PVSCSI_MEM_SPACE_SIZE);
1080     pci_register_bar(pci_dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->io_space);
1081
1082     pvscsi_init_msi(s);
1083
1084     s->completion_worker = qemu_bh_new(pvscsi_process_completion_queue, s);
1085     if (!s->completion_worker) {
1086         pvscsi_cleanup_msi(s);
1087         memory_region_destroy(&s->io_space);
1088         return -ENOMEM;
1089     }
1090
1091     scsi_bus_new(&s->bus, &pci_dev->qdev, &pvscsi_scsi_info, NULL);
1092     pvscsi_reset_state(s);
1093
1094     return 0;
1095 }
1096
1097 static void
1098 pvscsi_uninit(PCIDevice *pci_dev)
1099 {
1100     PVSCSIState *s = PVSCSI(pci_dev);
1101
1102     trace_pvscsi_state("uninit");
1103     qemu_bh_delete(s->completion_worker);
1104
1105     pvscsi_cleanup_msi(s);
1106
1107     memory_region_destroy(&s->io_space);
1108 }
1109
1110 static void
1111 pvscsi_reset(DeviceState *dev)
1112 {
1113     PCIDevice *d = PCI_DEVICE(dev);
1114     PVSCSIState *s = PVSCSI(d);
1115
1116     trace_pvscsi_state("reset");
1117     pvscsi_reset_adapter(s);
1118 }
1119
1120 static void
1121 pvscsi_pre_save(void *opaque)
1122 {
1123     PVSCSIState *s = (PVSCSIState *) opaque;
1124
1125     trace_pvscsi_state("presave");
1126
1127     assert(QTAILQ_EMPTY(&s->pending_queue));
1128     assert(QTAILQ_EMPTY(&s->completion_queue));
1129 }
1130
1131 static int
1132 pvscsi_post_load(void *opaque, int version_id)
1133 {
1134     trace_pvscsi_state("postload");
1135     return 0;
1136 }
1137
1138 static const VMStateDescription vmstate_pvscsi = {
1139     .name = TYPE_PVSCSI,
1140     .version_id = 0,
1141     .minimum_version_id = 0,
1142     .minimum_version_id_old = 0,
1143     .pre_save = pvscsi_pre_save,
1144     .post_load = pvscsi_post_load,
1145     .fields      = (VMStateField[]) {
1146         VMSTATE_PCI_DEVICE(parent_obj, PVSCSIState),
1147         VMSTATE_UINT8(msi_used, PVSCSIState),
1148         VMSTATE_UINT32(resetting, PVSCSIState),
1149         VMSTATE_UINT64(reg_interrupt_status, PVSCSIState),
1150         VMSTATE_UINT64(reg_interrupt_enabled, PVSCSIState),
1151         VMSTATE_UINT64(reg_command_status, PVSCSIState),
1152         VMSTATE_UINT64(curr_cmd, PVSCSIState),
1153         VMSTATE_UINT32(curr_cmd_data_cntr, PVSCSIState),
1154         VMSTATE_UINT32_ARRAY(curr_cmd_data, PVSCSIState,
1155                              ARRAY_SIZE(((PVSCSIState *)NULL)->curr_cmd_data)),
1156         VMSTATE_UINT8(rings_info_valid, PVSCSIState),
1157         VMSTATE_UINT8(msg_ring_info_valid, PVSCSIState),
1158         VMSTATE_UINT8(use_msg, PVSCSIState),
1159
1160         VMSTATE_UINT64(rings.rs_pa, PVSCSIState),
1161         VMSTATE_UINT32(rings.txr_len_mask, PVSCSIState),
1162         VMSTATE_UINT32(rings.rxr_len_mask, PVSCSIState),
1163         VMSTATE_UINT64_ARRAY(rings.req_ring_pages_pa, PVSCSIState,
1164                              PVSCSI_SETUP_RINGS_MAX_NUM_PAGES),
1165         VMSTATE_UINT64_ARRAY(rings.cmp_ring_pages_pa, PVSCSIState,
1166                              PVSCSI_SETUP_RINGS_MAX_NUM_PAGES),
1167         VMSTATE_UINT64(rings.consumed_ptr, PVSCSIState),
1168         VMSTATE_UINT64(rings.filled_cmp_ptr, PVSCSIState),
1169
1170         VMSTATE_END_OF_LIST()
1171     }
1172 };
1173
1174 static void
1175 pvscsi_write_config(PCIDevice *pci, uint32_t addr, uint32_t val, int len)
1176 {
1177     pci_default_write_config(pci, addr, val, len);
1178     msi_write_config(pci, addr, val, len);
1179 }
1180
1181 static Property pvscsi_properties[] = {
1182     DEFINE_PROP_UINT8("use_msg", PVSCSIState, use_msg, 1),
1183     DEFINE_PROP_END_OF_LIST(),
1184 };
1185
1186 static void pvscsi_class_init(ObjectClass *klass, void *data)
1187 {
1188     DeviceClass *dc = DEVICE_CLASS(klass);
1189     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1190
1191     k->init = pvscsi_init;
1192     k->exit = pvscsi_uninit;
1193     k->vendor_id = PCI_VENDOR_ID_VMWARE;
1194     k->device_id = PCI_DEVICE_ID_VMWARE_PVSCSI;
1195     k->class_id = PCI_CLASS_STORAGE_SCSI;
1196     k->subsystem_id = 0x1000;
1197     dc->reset = pvscsi_reset;
1198     dc->vmsd = &vmstate_pvscsi;
1199     dc->props = pvscsi_properties;
1200     k->config_write = pvscsi_write_config;
1201 }
1202
1203 static const TypeInfo pvscsi_info = {
1204     .name          = "pvscsi",
1205     .parent        = TYPE_PCI_DEVICE,
1206     .instance_size = sizeof(PVSCSIState),
1207     .class_init    = pvscsi_class_init,
1208 };
1209
1210 static void
1211 pvscsi_register_types(void)
1212 {
1213     type_register_static(&pvscsi_info);
1214 }
1215
1216 type_init(pvscsi_register_types);