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 "block_int.h"
  31 #include "dma.h"
  32
  33 #include <hw/ide/pci.h>
  34
  35 #define BMDMA_PAGE_SIZE 4096
  36
  37 static void bmdma_start_dma(IDEDMA *dma, IDEState *s,
  38                             BlockDriverCompletionFunc *dma_cb)
  39 {
  40     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
  41
  42     bm->unit = s->unit;
  43     bm->dma_cb = dma_cb;
  44     bm->cur_prd_last = 0;
  45     bm->cur_prd_addr = 0;
  46     bm->cur_prd_len = 0;
  47     bm->sector_num = ide_get_sector(s);
  48     bm->nsector = s->nsector;
  49
  50     if (bm->status & BM_STATUS_DMAING) {
  51         bm->dma_cb(bmdma_active_if(bm), 0);
  52     }
  53 }
  54
  55 /* return 0 if buffer completed */
  56 static int bmdma_prepare_buf(IDEDMA *dma, int is_write)
  57 {
  58     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
  59     IDEState *s = bmdma_active_if(bm);
  60     struct {
  61         uint32_t addr;
  62         uint32_t size;
  63     } prd;
  64     int l, len;
  65
  66     qemu_sglist_init(&s->sg, 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             cpu_physical_memory_read(bm->cur_addr, (uint8_t *)&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             cpu_physical_memory_read(bm->cur_addr, (uint8_t *)&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                 cpu_physical_memory_write(bm->cur_prd_addr,
 132                                           s->io_buffer + s->io_buffer_index, l);
 133             } else {
 134                 cpu_physical_memory_read(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, int is_read)
 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->is_read = is_read;
 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 static void bmdma_restart_bh(void *opaque)
 187 {
 188     BMDMAState *bm = opaque;
 189     int is_read;
 190
 191     qemu_bh_delete(bm->bh);
 192     bm->bh = NULL;
 193
 194     is_read = !!(bm->status & BM_STATUS_RETRY_READ);
 195
 196     if (bm->status & BM_STATUS_DMA_RETRY) {
 197         bm->status &= ~(BM_STATUS_DMA_RETRY | BM_STATUS_RETRY_READ);
 198         bmdma_restart_dma(bm, is_read);
 199     } else if (bm->status & BM_STATUS_PIO_RETRY) {
 200         bm->status &= ~(BM_STATUS_PIO_RETRY | BM_STATUS_RETRY_READ);
 201         if (is_read) {
 202             ide_sector_read(bmdma_active_if(bm));
 203         } else {
 204             ide_sector_write(bmdma_active_if(bm));
 205         }
 206     } else if (bm->status & BM_STATUS_RETRY_FLUSH) {
 207         ide_flush_cache(bmdma_active_if(bm));
 208     }
 209 }
 210
 211 static void bmdma_restart_cb(void *opaque, int running, int reason)
 212 {
 213     IDEDMA *dma = opaque;
 214     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
 215
 216     if (!running)
 217         return;
 218
 219     if (!bm->bh) {
 220         bm->bh = qemu_bh_new(bmdma_restart_bh, &bm->dma);
 221         qemu_bh_schedule(bm->bh);
 222     }
 223 }
 224
 225 static void bmdma_cancel(BMDMAState *bm)
 226 {
 227     if (bm->status & BM_STATUS_DMAING) {
 228         /* cancel DMA request */
 229         bmdma_set_inactive(&bm->dma);
 230     }
 231 }
 232
 233 static int bmdma_reset(IDEDMA *dma)
 234 {
 235     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
 236
 237 #ifdef DEBUG_IDE
 238     printf("ide: dma_reset\n");
 239 #endif
 240     bmdma_cancel(bm);
 241     bm->cmd = 0;
 242     bm->status = 0;
 243     bm->addr = 0;
 244     bm->cur_addr = 0;
 245     bm->cur_prd_last = 0;
 246     bm->cur_prd_addr = 0;
 247     bm->cur_prd_len = 0;
 248     bm->sector_num = 0;
 249     bm->nsector = 0;
 250
 251     return 0;
 252 }
 253
 254 static int bmdma_start_transfer(IDEDMA *dma)
 255 {
 256     return 0;
 257 }
 258
 259 static void bmdma_irq(void *opaque, int n, int level)
 260 {
 261     BMDMAState *bm = opaque;
 262
 263     if (!level) {
 264         /* pass through lower */
 265         qemu_set_irq(bm->irq, level);
 266         return;
 267     }
 268
 269     bm->status |= BM_STATUS_INT;
 270
 271     /* trigger the real irq */
 272     qemu_set_irq(bm->irq, level);
 273 }
 274
 275 void bmdma_cmd_writeb(void *opaque, uint32_t addr, uint32_t val)
 276 {
 277     BMDMAState *bm = opaque;
 278 #ifdef DEBUG_IDE
 279     printf("%s: 0x%08x\n", __func__, val);
 280 #endif
 281
 282     /* Ignore writes to SSBM if it keeps the old value */
 283     if ((val & BM_CMD_START) != (bm->cmd & BM_CMD_START)) {
 284         if (!(val & BM_CMD_START)) {
 285             /*
 286              * We can't cancel Scatter Gather DMA in the middle of the
 287              * operation or a partial (not full) DMA transfer would reach
 288              * the storage so we wait for completion instead (we beahve
 289              * like if the DMA was completed by the time the guest trying
 290              * to cancel dma with bmdma_cmd_writeb with BM_CMD_START not
 291              * set).
 292              *
 293              * In the future we'll be able to safely cancel the I/O if the
 294              * whole DMA operation will be submitted to disk with a single
 295              * aio operation with preadv/pwritev.
 296              */
 297             if (bm->bus->dma->aiocb) {
 298                 qemu_aio_flush();
 299                 assert(bm->bus->dma->aiocb == NULL);
 300                 assert((bm->status & BM_STATUS_DMAING) == 0);
 301             }
 302         } else {
 303             bm->cur_addr = bm->addr;
 304             if (!(bm->status & BM_STATUS_DMAING)) {
 305                 bm->status |= BM_STATUS_DMAING;
 306                 /* start dma transfer if possible */
 307                 if (bm->dma_cb)
 308                     bm->dma_cb(bmdma_active_if(bm), 0);
 309             }
 310         }
 311     }
 312
 313     bm->cmd = val & 0x09;
 314 }
 315
 316 static void bmdma_addr_read(IORange *ioport, uint64_t addr,
 317                             unsigned width, uint64_t *data)
 318 {
 319     BMDMAState *bm = container_of(ioport, BMDMAState, addr_ioport);
 320     uint32_t mask = (1ULL << (width * 8)) - 1;
 321
 322     *data = (bm->addr >> (addr * 8)) & mask;
 323 #ifdef DEBUG_IDE
 324     printf("%s: 0x%08x\n", __func__, (unsigned)*data);
 325 #endif
 326 }
 327
 328 static void bmdma_addr_write(IORange *ioport, uint64_t addr,
 329                              unsigned width, uint64_t data)
 330 {
 331     BMDMAState *bm = container_of(ioport, BMDMAState, addr_ioport);
 332     int shift = addr * 8;
 333     uint32_t mask = (1ULL << (width * 8)) - 1;
 334
 335 #ifdef DEBUG_IDE
 336     printf("%s: 0x%08x\n", __func__, (unsigned)data);
 337 #endif
 338     bm->addr &= ~(mask << shift);
 339     bm->addr |= ((data & mask) << shift) & ~3;
 340 }
 341
 342 const IORangeOps bmdma_addr_ioport_ops = {
 343     .read = bmdma_addr_read,
 344     .write = bmdma_addr_write,
 345 };
 346
 347 static bool ide_bmdma_current_needed(void *opaque)
 348 {
 349     BMDMAState *bm = opaque;
 350
 351     return (bm->cur_prd_len != 0);
 352 }
 353
 354 static const VMStateDescription vmstate_bmdma_current = {
 355     .name = "ide bmdma_current",
 356     .version_id = 1,
 357     .minimum_version_id = 1,
 358     .minimum_version_id_old = 1,
 359     .fields      = (VMStateField []) {
 360         VMSTATE_UINT32(cur_addr, BMDMAState),
 361         VMSTATE_UINT32(cur_prd_last, BMDMAState),
 362         VMSTATE_UINT32(cur_prd_addr, BMDMAState),
 363         VMSTATE_UINT32(cur_prd_len, BMDMAState),
 364         VMSTATE_END_OF_LIST()
 365     }
 366 };
 367
 368
 369 static const VMStateDescription vmstate_bmdma = {
 370     .name = "ide bmdma",
 371     .version_id = 3,
 372     .minimum_version_id = 0,
 373     .minimum_version_id_old = 0,
 374     .fields      = (VMStateField []) {
 375         VMSTATE_UINT8(cmd, BMDMAState),
 376         VMSTATE_UINT8(status, BMDMAState),
 377         VMSTATE_UINT32(addr, BMDMAState),
 378         VMSTATE_INT64(sector_num, BMDMAState),
 379         VMSTATE_UINT32(nsector, BMDMAState),
 380         VMSTATE_UINT8(unit, BMDMAState),
 381         VMSTATE_END_OF_LIST()
 382     },
 383     .subsections = (VMStateSubsection []) {
 384         {
 385             .vmsd = &vmstate_bmdma_current,
 386             .needed = ide_bmdma_current_needed,
 387         }, {
 388             /* empty */
 389         }
 390     }
 391 };
 392
 393 static int ide_pci_post_load(void *opaque, int version_id)
 394 {
 395     PCIIDEState *d = opaque;
 396     int i;
 397
 398     for(i = 0; i < 2; i++) {
 399         /* current versions always store 0/1, but older version
 400            stored bigger values. We only need last bit */
 401         d->bmdma[i].unit &= 1;
 402     }
 403     return 0;
 404 }
 405
 406 const VMStateDescription vmstate_ide_pci = {
 407     .name = "ide",
 408     .version_id = 3,
 409     .minimum_version_id = 0,
 410     .minimum_version_id_old = 0,
 411     .post_load = ide_pci_post_load,
 412     .fields      = (VMStateField []) {
 413         VMSTATE_PCI_DEVICE(dev, PCIIDEState),
 414         VMSTATE_STRUCT_ARRAY(bmdma, PCIIDEState, 2, 0,
 415                              vmstate_bmdma, BMDMAState),
 416         VMSTATE_IDE_BUS_ARRAY(bus, PCIIDEState, 2),
 417         VMSTATE_IDE_DRIVES(bus[0].ifs, PCIIDEState),
 418         VMSTATE_IDE_DRIVES(bus[1].ifs, PCIIDEState),
 419         VMSTATE_END_OF_LIST()
 420     }
 421 };
 422
 423 void pci_ide_create_devs(PCIDevice *dev, DriveInfo **hd_table)
 424 {
 425     PCIIDEState *d = DO_UPCAST(PCIIDEState, dev, dev);
 426     static const int bus[4]  = { 0, 0, 1, 1 };
 427     static const int unit[4] = { 0, 1, 0, 1 };
 428     int i;
 429
 430     for (i = 0; i < 4; i++) {
 431         if (hd_table[i] == NULL)
 432             continue;
 433         ide_create_drive(d->bus+bus[i], unit[i], hd_table[i]);
 434     }
 435 }
 436
 437 static const struct IDEDMAOps bmdma_ops = {
 438     .start_dma = bmdma_start_dma,
 439     .start_transfer = bmdma_start_transfer,
 440     .prepare_buf = bmdma_prepare_buf,
 441     .rw_buf = bmdma_rw_buf,
 442     .set_unit = bmdma_set_unit,
 443     .add_status = bmdma_add_status,
 444     .set_inactive = bmdma_set_inactive,
 445     .restart_cb = bmdma_restart_cb,
 446     .reset = bmdma_reset,
 447 };
 448
 449 void bmdma_init(IDEBus *bus, BMDMAState *bm)
 450 {
 451     qemu_irq *irq;
 452
 453     if (bus->dma == &bm->dma) {
 454         return;
 455     }
 456
 457     bm->dma.ops = &bmdma_ops;
 458     bus->dma = &bm->dma;
 459     bm->irq = bus->irq;
 460     irq = qemu_allocate_irqs(bmdma_irq, bm, 1);
 461     bus->irq = *irq;
 462 }