hw/ide/pci.c

   1 /*
   2  * QEMU IDE Emulation: PCI Bus support.
   3  *
   4  * Copyright (c) 2003 Fabrice Bellard
   5  * Copyright (c) 2006 Openedhand Ltd.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #include <hw/hw.h>
  26 #include <hw/pc.h>
  27 #include <hw/pci.h>
  28 #include <hw/isa.h>
  29 #include "block.h"
  30 #include "dma.h"
  31
  32 #include <hw/ide/pci.h>
  33
  34 #define BMDMA_PAGE_SIZE 4096
  35
  36 static void bmdma_start_dma(IDEDMA *dma, IDEState *s,
  37                             BlockDriverCompletionFunc *dma_cb)
  38 {
  39     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
  40
  41     bm->unit = s->unit;
  42     bm->dma_cb = dma_cb;
  43     bm->cur_prd_last = 0;
  44     bm->cur_prd_addr = 0;
  45     bm->cur_prd_len = 0;
  46     bm->sector_num = ide_get_sector(s);
  47     bm->nsector = s->nsector;
  48
  49     if (bm->status & BM_STATUS_DMAING) {
  50         bm->dma_cb(bmdma_active_if(bm), 0);
  51     }
  52 }
  53
  54 /* return 0 if buffer completed */
  55 static int bmdma_prepare_buf(IDEDMA *dma, int is_write)
  56 {
  57     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
  58     IDEState *s = bmdma_active_if(bm);
  59     struct {
  60         uint32_t addr;
  61         uint32_t size;
  62     } prd;
  63     int l, len;
  64
  65     pci_dma_sglist_init(&s->sg, &bm->pci_dev->dev,
  66                         s->nsector / (BMDMA_PAGE_SIZE / 512) + 1);
  67     s->io_buffer_size = 0;
  68     for(;;) {
  69         if (bm->cur_prd_len == 0) {
  70             /* end of table (with a fail safe of one page) */
  71             if (bm->cur_prd_last ||
  72                 (bm->cur_addr - bm->addr) >= BMDMA_PAGE_SIZE)
  73                 return s->io_buffer_size != 0;
  74             pci_dma_read(&bm->pci_dev->dev, bm->cur_addr, &prd, 8);
  75             bm->cur_addr += 8;
  76             prd.addr = le32_to_cpu(prd.addr);
  77             prd.size = le32_to_cpu(prd.size);
  78             len = prd.size & 0xfffe;
  79             if (len == 0)
  80                 len = 0x10000;
  81             bm->cur_prd_len = len;
  82             bm->cur_prd_addr = prd.addr;
  83             bm->cur_prd_last = (prd.size & 0x80000000);
  84         }
  85         l = bm->cur_prd_len;
  86         if (l > 0) {
  87             qemu_sglist_add(&s->sg, bm->cur_prd_addr, l);
  88             bm->cur_prd_addr += l;
  89             bm->cur_prd_len -= l;
  90             s->io_buffer_size += l;
  91         }
  92     }
  93     return 1;
  94 }
  95
  96 /* return 0 if buffer completed */
  97 static int bmdma_rw_buf(IDEDMA *dma, int is_write)
  98 {
  99     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
 100     IDEState *s = bmdma_active_if(bm);
 101     struct {
 102         uint32_t addr;
 103         uint32_t size;
 104     } prd;
 105     int l, len;
 106
 107     for(;;) {
 108         l = s->io_buffer_size - s->io_buffer_index;
 109         if (l <= 0)
 110             break;
 111         if (bm->cur_prd_len == 0) {
 112             /* end of table (with a fail safe of one page) */
 113             if (bm->cur_prd_last ||
 114                 (bm->cur_addr - bm->addr) >= BMDMA_PAGE_SIZE)
 115                 return 0;
 116             pci_dma_read(&bm->pci_dev->dev, bm->cur_addr, &prd, 8);
 117             bm->cur_addr += 8;
 118             prd.addr = le32_to_cpu(prd.addr);
 119             prd.size = le32_to_cpu(prd.size);
 120             len = prd.size & 0xfffe;
 121             if (len == 0)
 122                 len = 0x10000;
 123             bm->cur_prd_len = len;
 124             bm->cur_prd_addr = prd.addr;
 125             bm->cur_prd_last = (prd.size & 0x80000000);
 126         }
 127         if (l > bm->cur_prd_len)
 128             l = bm->cur_prd_len;
 129         if (l > 0) {
 130             if (is_write) {
 131                 pci_dma_write(&bm->pci_dev->dev, bm->cur_prd_addr,
 132                               s->io_buffer + s->io_buffer_index, l);
 133             } else {
 134                 pci_dma_read(&bm->pci_dev->dev, bm->cur_prd_addr,
 135                              s->io_buffer + s->io_buffer_index, l);
 136             }
 137             bm->cur_prd_addr += l;
 138             bm->cur_prd_len -= l;
 139             s->io_buffer_index += l;
 140         }
 141     }
 142     return 1;
 143 }
 144
 145 static int bmdma_set_unit(IDEDMA *dma, int unit)
 146 {
 147     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
 148     bm->unit = unit;
 149
 150     return 0;
 151 }
 152
 153 static int bmdma_add_status(IDEDMA *dma, int status)
 154 {
 155     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
 156     bm->status |= status;
 157
 158     return 0;
 159 }
 160
 161 static int bmdma_set_inactive(IDEDMA *dma)
 162 {
 163     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
 164
 165     bm->status &= ~BM_STATUS_DMAING;
 166     bm->dma_cb = NULL;
 167     bm->unit = -1;
 168
 169     return 0;
 170 }
 171
 172 static void bmdma_restart_dma(BMDMAState *bm, enum ide_dma_cmd dma_cmd)
 173 {
 174     IDEState *s = bmdma_active_if(bm);
 175
 176     ide_set_sector(s, bm->sector_num);
 177     s->io_buffer_index = 0;
 178     s->io_buffer_size = 0;
 179     s->nsector = bm->nsector;
 180     s->dma_cmd = dma_cmd;
 181     bm->cur_addr = bm->addr;
 182     bm->dma_cb = ide_dma_cb;
 183     bmdma_start_dma(&bm->dma, s, bm->dma_cb);
 184 }
 185
 186 /* TODO This should be common IDE code */
 187 static void bmdma_restart_bh(void *opaque)
 188 {
 189     BMDMAState *bm = opaque;
 190     IDEBus *bus = bm->bus;
 191     int is_read;
 192     int error_status;
 193
 194     qemu_bh_delete(bm->bh);
 195     bm->bh = NULL;
 196
 197     if (bm->unit == (uint8_t) -1) {
 198         return;
 199     }
 200
 201     is_read = !!(bus->error_status & BM_STATUS_RETRY_READ);
 202
 203     /* The error status must be cleared before resubmitting the request: The
 204      * request may fail again, and this case can only be distinguished if the
 205      * called function can set a new error status. */
 206     error_status = bus->error_status;
 207     bus->error_status = 0;
 208
 209     if (error_status & BM_STATUS_DMA_RETRY) {
 210         if (error_status & BM_STATUS_RETRY_TRIM) {
 211             bmdma_restart_dma(bm, IDE_DMA_TRIM);
 212         } else {
 213             bmdma_restart_dma(bm, is_read ? IDE_DMA_READ : IDE_DMA_WRITE);
 214         }
 215     } else if (error_status & BM_STATUS_PIO_RETRY) {
 216         if (is_read) {
 217             ide_sector_read(bmdma_active_if(bm));
 218         } else {
 219             ide_sector_write(bmdma_active_if(bm));
 220         }
 221     } else if (error_status & BM_STATUS_RETRY_FLUSH) {
 222         ide_flush_cache(bmdma_active_if(bm));
 223     }
 224 }
 225
 226 static void bmdma_restart_cb(void *opaque, int running, RunState state)
 227 {
 228     IDEDMA *dma = opaque;
 229     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
 230
 231     if (!running)
 232         return;
 233
 234     if (!bm->bh) {
 235         bm->bh = qemu_bh_new(bmdma_restart_bh, &bm->dma);
 236         qemu_bh_schedule(bm->bh);
 237     }
 238 }
 239
 240 static void bmdma_cancel(BMDMAState *bm)
 241 {
 242     if (bm->status & BM_STATUS_DMAING) {
 243         /* cancel DMA request */
 244         bmdma_set_inactive(&bm->dma);
 245     }
 246 }
 247
 248 static int bmdma_reset(IDEDMA *dma)
 249 {
 250     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
 251
 252 #ifdef DEBUG_IDE
 253     printf("ide: dma_reset\n");
 254 #endif
 255     bmdma_cancel(bm);
 256     bm->cmd = 0;
 257     bm->status = 0;
 258     bm->addr = 0;
 259     bm->cur_addr = 0;
 260     bm->cur_prd_last = 0;
 261     bm->cur_prd_addr = 0;
 262     bm->cur_prd_len = 0;
 263     bm->sector_num = 0;
 264     bm->nsector = 0;
 265
 266     return 0;
 267 }
 268
 269 static int bmdma_start_transfer(IDEDMA *dma)
 270 {
 271     return 0;
 272 }
 273
 274 static void bmdma_irq(void *opaque, int n, int level)
 275 {
 276     BMDMAState *bm = opaque;
 277
 278     if (!level) {
 279         /* pass through lower */
 280         qemu_set_irq(bm->irq, level);
 281         return;
 282     }
 283
 284     bm->status |= BM_STATUS_INT;
 285
 286     /* trigger the real irq */
 287     qemu_set_irq(bm->irq, level);
 288 }
 289
 290 void bmdma_cmd_writeb(BMDMAState *bm, uint32_t val)
 291 {
 292 #ifdef DEBUG_IDE
 293     printf("%s: 0x%08x\n", __func__, val);
 294 #endif
 295
 296     /* Ignore writes to SSBM if it keeps the old value */
 297     if ((val & BM_CMD_START) != (bm->cmd & BM_CMD_START)) {
 298         if (!(val & BM_CMD_START)) {
 299             /*
 300              * We can't cancel Scatter Gather DMA in the middle of the
 301              * operation or a partial (not full) DMA transfer would reach
 302              * the storage so we wait for completion instead (we beahve
 303              * like if the DMA was completed by the time the guest trying
 304              * to cancel dma with bmdma_cmd_writeb with BM_CMD_START not
 305              * set).
 306              *
 307              * In the future we'll be able to safely cancel the I/O if the
 308              * whole DMA operation will be submitted to disk with a single
 309              * aio operation with preadv/pwritev.
 310              */
 311             if (bm->bus->dma->aiocb) {
 312                 bdrv_drain_all();
 313                 assert(bm->bus->dma->aiocb == NULL);
 314                 assert((bm->status & BM_STATUS_DMAING) == 0);
 315             }
 316         } else {
 317             bm->cur_addr = bm->addr;
 318             if (!(bm->status & BM_STATUS_DMAING)) {
 319                 bm->status |= BM_STATUS_DMAING;
 320                 /* start dma transfer if possible */
 321                 if (bm->dma_cb)
 322                     bm->dma_cb(bmdma_active_if(bm), 0);
 323             }
 324         }
 325     }
 326
 327     bm->cmd = val & 0x09;
 328 }
 329
 330 static uint64_t bmdma_addr_read(void *opaque, target_phys_addr_t addr,
 331                                 unsigned width)
 332 {
 333     BMDMAState *bm = opaque;
 334     uint32_t mask = (1ULL << (width * 8)) - 1;
 335     uint64_t data;
 336
 337     data = (bm->addr >> (addr * 8)) & mask;
 338 #ifdef DEBUG_IDE
 339     printf("%s: 0x%08x\n", __func__, (unsigned)data);
 340 #endif
 341     return data;
 342 }
 343
 344 static void bmdma_addr_write(void *opaque, target_phys_addr_t addr,
 345                              uint64_t data, unsigned width)
 346 {
 347     BMDMAState *bm = opaque;
 348     int shift = addr * 8;
 349     uint32_t mask = (1ULL << (width * 8)) - 1;
 350
 351 #ifdef DEBUG_IDE
 352     printf("%s: 0x%08x\n", __func__, (unsigned)data);
 353 #endif
 354     bm->addr &= ~(mask << shift);
 355     bm->addr |= ((data & mask) << shift) & ~3;
 356 }
 357
 358 MemoryRegionOps bmdma_addr_ioport_ops = {
 359     .read = bmdma_addr_read,
 360     .write = bmdma_addr_write,
 361     .endianness = DEVICE_LITTLE_ENDIAN,
 362 };
 363
 364 static bool ide_bmdma_current_needed(void *opaque)
 365 {
 366     BMDMAState *bm = opaque;
 367
 368     return (bm->cur_prd_len != 0);
 369 }
 370
 371 static bool ide_bmdma_status_needed(void *opaque)
 372 {
 373     BMDMAState *bm = opaque;
 374
 375     /* Older versions abused some bits in the status register for internal
 376      * error state. If any of these bits are set, we must add a subsection to
 377      * transfer the real status register */
 378     uint8_t abused_bits = BM_MIGRATION_COMPAT_STATUS_BITS;
 379
 380     return ((bm->status & abused_bits) != 0);
 381 }
 382
 383 static void ide_bmdma_pre_save(void *opaque)
 384 {
 385     BMDMAState *bm = opaque;
 386     uint8_t abused_bits = BM_MIGRATION_COMPAT_STATUS_BITS;
 387
 388     bm->migration_compat_status =
 389         (bm->status & ~abused_bits) | (bm->bus->error_status & abused_bits);
 390 }
 391
 392 /* This function accesses bm->bus->error_status which is loaded only after
 393  * BMDMA itself. This is why the function is called from ide_pci_post_load
 394  * instead of being registered with VMState where it would run too early. */
 395 static int ide_bmdma_post_load(void *opaque, int version_id)
 396 {
 397     BMDMAState *bm = opaque;
 398     uint8_t abused_bits = BM_MIGRATION_COMPAT_STATUS_BITS;
 399
 400     if (bm->status == 0) {
 401         bm->status = bm->migration_compat_status & ~abused_bits;
 402         bm->bus->error_status |= bm->migration_compat_status & abused_bits;
 403     }
 404
 405     return 0;
 406 }
 407
 408 static const VMStateDescription vmstate_bmdma_current = {
 409     .name = "ide bmdma_current",
 410     .version_id = 1,
 411     .minimum_version_id = 1,
 412     .minimum_version_id_old = 1,
 413     .fields      = (VMStateField []) {
 414         VMSTATE_UINT32(cur_addr, BMDMAState),
 415         VMSTATE_UINT32(cur_prd_last, BMDMAState),
 416         VMSTATE_UINT32(cur_prd_addr, BMDMAState),
 417         VMSTATE_UINT32(cur_prd_len, BMDMAState),
 418         VMSTATE_END_OF_LIST()
 419     }
 420 };
 421
 422 const VMStateDescription vmstate_bmdma_status = {
 423     .name ="ide bmdma/status",
 424     .version_id = 1,
 425     .minimum_version_id = 1,
 426     .minimum_version_id_old = 1,
 427     .fields = (VMStateField []) {
 428         VMSTATE_UINT8(status, BMDMAState),
 429         VMSTATE_END_OF_LIST()
 430     }
 431 };
 432
 433 static const VMStateDescription vmstate_bmdma = {
 434     .name = "ide bmdma",
 435     .version_id = 3,
 436     .minimum_version_id = 0,
 437     .minimum_version_id_old = 0,
 438     .pre_save  = ide_bmdma_pre_save,
 439     .fields      = (VMStateField []) {
 440         VMSTATE_UINT8(cmd, BMDMAState),
 441         VMSTATE_UINT8(migration_compat_status, BMDMAState),
 442         VMSTATE_UINT32(addr, BMDMAState),
 443         VMSTATE_INT64(sector_num, BMDMAState),
 444         VMSTATE_UINT32(nsector, BMDMAState),
 445         VMSTATE_UINT8(unit, BMDMAState),
 446         VMSTATE_END_OF_LIST()
 447     },
 448     .subsections = (VMStateSubsection []) {
 449         {
 450             .vmsd = &vmstate_bmdma_current,
 451             .needed = ide_bmdma_current_needed,
 452         }, {
 453             .vmsd = &vmstate_bmdma_status,
 454             .needed = ide_bmdma_status_needed,
 455         }, {
 456             /* empty */
 457         }
 458     }
 459 };
 460
 461 static int ide_pci_post_load(void *opaque, int version_id)
 462 {
 463     PCIIDEState *d = opaque;
 464     int i;
 465
 466     for(i = 0; i < 2; i++) {
 467         /* current versions always store 0/1, but older version
 468            stored bigger values. We only need last bit */
 469         d->bmdma[i].unit &= 1;
 470         ide_bmdma_post_load(&d->bmdma[i], -1);
 471     }
 472
 473     return 0;
 474 }
 475
 476 const VMStateDescription vmstate_ide_pci = {
 477     .name = "ide",
 478     .version_id = 3,
 479     .minimum_version_id = 0,
 480     .minimum_version_id_old = 0,
 481     .post_load = ide_pci_post_load,
 482     .fields      = (VMStateField []) {
 483         VMSTATE_PCI_DEVICE(dev, PCIIDEState),
 484         VMSTATE_STRUCT_ARRAY(bmdma, PCIIDEState, 2, 0,
 485                              vmstate_bmdma, BMDMAState),
 486         VMSTATE_IDE_BUS_ARRAY(bus, PCIIDEState, 2),
 487         VMSTATE_IDE_DRIVES(bus[0].ifs, PCIIDEState),
 488         VMSTATE_IDE_DRIVES(bus[1].ifs, PCIIDEState),
 489         VMSTATE_END_OF_LIST()
 490     }
 491 };
 492
 493 void pci_ide_create_devs(PCIDevice *dev, DriveInfo **hd_table)
 494 {
 495     PCIIDEState *d = DO_UPCAST(PCIIDEState, dev, dev);
 496     static const int bus[4]  = { 0, 0, 1, 1 };
 497     static const int unit[4] = { 0, 1, 0, 1 };
 498     int i;
 499
 500     for (i = 0; i < 4; i++) {
 501         if (hd_table[i] == NULL)
 502             continue;
 503         ide_create_drive(d->bus+bus[i], unit[i], hd_table[i]);
 504     }
 505 }
 506
 507 static const struct IDEDMAOps bmdma_ops = {
 508     .start_dma = bmdma_start_dma,
 509     .start_transfer = bmdma_start_transfer,
 510     .prepare_buf = bmdma_prepare_buf,
 511     .rw_buf = bmdma_rw_buf,
 512     .set_unit = bmdma_set_unit,
 513     .add_status = bmdma_add_status,
 514     .set_inactive = bmdma_set_inactive,
 515     .restart_cb = bmdma_restart_cb,
 516     .reset = bmdma_reset,
 517 };
 518
 519 void bmdma_init(IDEBus *bus, BMDMAState *bm, PCIIDEState *d)
 520 {
 521     qemu_irq *irq;
 522
 523     if (bus->dma == &bm->dma) {
 524         return;
 525     }
 526
 527     bm->dma.ops = &bmdma_ops;
 528     bus->dma = &bm->dma;
 529     bm->irq = bus->irq;
 530     irq = qemu_allocate_irqs(bmdma_irq, bm, 1);
 531     bus->irq = *irq;
 532     bm->pci_dev = d;
 533 }