hw/ide/ahci.c

   1 /*
   2  * QEMU AHCI Emulation
   3  *
   4  * Copyright (c) 2010 qiaochong@loongson.cn
   5  * Copyright (c) 2010 Roland Elek <elek.roland@gmail.com>
   6  * Copyright (c) 2010 Sebastian Herbszt <herbszt@gmx.de>
   7  * Copyright (c) 2010 Alexander Graf <agraf@suse.de>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  21  *
  22  */
  23
  24 #include <hw/hw.h>
  25 #include <hw/msi.h>
  26 #include <hw/pc.h>
  27 #include <hw/pci.h>
  28
  29 #include "monitor.h"
  30 #include "dma.h"
  31 #include "cpu-common.h"
  32 #include "internal.h"
  33 #include <hw/ide/pci.h>
  34 #include <hw/ide/ahci.h>
  35
  36 /* #define DEBUG_AHCI */
  37
  38 #ifdef DEBUG_AHCI
  39 #define DPRINTF(port, fmt, ...) \
  40 do { fprintf(stderr, "ahci: %s: [%d] ", __FUNCTION__, port); \
  41      fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  42 #else
  43 #define DPRINTF(port, fmt, ...) do {} while(0)
  44 #endif
  45
  46 static void check_cmd(AHCIState *s, int port);
  47 static int handle_cmd(AHCIState *s,int port,int slot);
  48 static void ahci_reset_port(AHCIState *s, int port);
  49 static void ahci_write_fis_d2h(AHCIDevice *ad, uint8_t *cmd_fis);
  50 static void ahci_init_d2h(AHCIDevice *ad);
  51
  52 static uint32_t  ahci_port_read(AHCIState *s, int port, int offset)
  53 {
  54     uint32_t val;
  55     AHCIPortRegs *pr;
  56     pr = &s->dev[port].port_regs;
  57
  58     switch (offset) {
  59     case PORT_LST_ADDR:
  60         val = pr->lst_addr;
  61         break;
  62     case PORT_LST_ADDR_HI:
  63         val = pr->lst_addr_hi;
  64         break;
  65     case PORT_FIS_ADDR:
  66         val = pr->fis_addr;
  67         break;
  68     case PORT_FIS_ADDR_HI:
  69         val = pr->fis_addr_hi;
  70         break;
  71     case PORT_IRQ_STAT:
  72         val = pr->irq_stat;
  73         break;
  74     case PORT_IRQ_MASK:
  75         val = pr->irq_mask;
  76         break;
  77     case PORT_CMD:
  78         val = pr->cmd;
  79         break;
  80     case PORT_TFDATA:
  81         val = ((uint16_t)s->dev[port].port.ifs[0].error << 8) |
  82               s->dev[port].port.ifs[0].status;
  83         break;
  84     case PORT_SIG:
  85         val = pr->sig;
  86         break;
  87     case PORT_SCR_STAT:
  88         if (s->dev[port].port.ifs[0].bs) {
  89             val = SATA_SCR_SSTATUS_DET_DEV_PRESENT_PHY_UP |
  90                   SATA_SCR_SSTATUS_SPD_GEN1 | SATA_SCR_SSTATUS_IPM_ACTIVE;
  91         } else {
  92             val = SATA_SCR_SSTATUS_DET_NODEV;
  93         }
  94         break;
  95     case PORT_SCR_CTL:
  96         val = pr->scr_ctl;
  97         break;
  98     case PORT_SCR_ERR:
  99         val = pr->scr_err;
 100         break;
 101     case PORT_SCR_ACT:
 102         pr->scr_act &= ~s->dev[port].finished;
 103         s->dev[port].finished = 0;
 104         val = pr->scr_act;
 105         break;
 106     case PORT_CMD_ISSUE:
 107         val = pr->cmd_issue;
 108         break;
 109     case PORT_RESERVED:
 110     default:
 111         val = 0;
 112     }
 113     DPRINTF(port, "offset: 0x%x val: 0x%x\n", offset, val);
 114     return val;
 115
 116 }
 117
 118 static void ahci_irq_raise(AHCIState *s, AHCIDevice *dev)
 119 {
 120     struct AHCIPCIState *d = container_of(s, AHCIPCIState, ahci);
 121
 122     DPRINTF(0, "raise irq\n");
 123
 124     if (msi_enabled(&d->card)) {
 125         msi_notify(&d->card, 0);
 126     } else {
 127         qemu_irq_raise(s->irq);
 128     }
 129 }
 130
 131 static void ahci_irq_lower(AHCIState *s, AHCIDevice *dev)
 132 {
 133     struct AHCIPCIState *d = container_of(s, AHCIPCIState, ahci);
 134
 135     DPRINTF(0, "lower irq\n");
 136
 137     if (!msi_enabled(&d->card)) {
 138         qemu_irq_lower(s->irq);
 139     }
 140 }
 141
 142 static void ahci_check_irq(AHCIState *s)
 143 {
 144     int i;
 145
 146     DPRINTF(-1, "check irq %#x\n", s->control_regs.irqstatus);
 147
 148     for (i = 0; i < s->ports; i++) {
 149         AHCIPortRegs *pr = &s->dev[i].port_regs;
 150         if (pr->irq_stat & pr->irq_mask) {
 151             s->control_regs.irqstatus |= (1 << i);
 152         }
 153     }
 154
 155     if (s->control_regs.irqstatus &&
 156         (s->control_regs.ghc & HOST_CTL_IRQ_EN)) {
 157             ahci_irq_raise(s, NULL);
 158     } else {
 159         ahci_irq_lower(s, NULL);
 160     }
 161 }
 162
 163 static void ahci_trigger_irq(AHCIState *s, AHCIDevice *d,
 164                              int irq_type)
 165 {
 166     DPRINTF(d->port_no, "trigger irq %#x -> %x\n",
 167             irq_type, d->port_regs.irq_mask & irq_type);
 168
 169     d->port_regs.irq_stat |= irq_type;
 170     ahci_check_irq(s);
 171 }
 172
 173 static void map_page(uint8_t **ptr, uint64_t addr, uint32_t wanted)
 174 {
 175     target_phys_addr_t len = wanted;
 176
 177     if (*ptr) {
 178         cpu_physical_memory_unmap(*ptr, len, 1, len);
 179     }
 180
 181     *ptr = cpu_physical_memory_map(addr, &len, 1);
 182     if (len < wanted) {
 183         cpu_physical_memory_unmap(*ptr, len, 1, len);
 184         *ptr = NULL;
 185     }
 186 }
 187
 188 static void  ahci_port_write(AHCIState *s, int port, int offset, uint32_t val)
 189 {
 190     AHCIPortRegs *pr = &s->dev[port].port_regs;
 191
 192     DPRINTF(port, "offset: 0x%x val: 0x%x\n", offset, val);
 193     switch (offset) {
 194         case PORT_LST_ADDR:
 195             pr->lst_addr = val;
 196             map_page(&s->dev[port].lst,
 197                      ((uint64_t)pr->lst_addr_hi << 32) | pr->lst_addr, 1024);
 198             s->dev[port].cur_cmd = NULL;
 199             break;
 200         case PORT_LST_ADDR_HI:
 201             pr->lst_addr_hi = val;
 202             map_page(&s->dev[port].lst,
 203                      ((uint64_t)pr->lst_addr_hi << 32) | pr->lst_addr, 1024);
 204             s->dev[port].cur_cmd = NULL;
 205             break;
 206         case PORT_FIS_ADDR:
 207             pr->fis_addr = val;
 208             map_page(&s->dev[port].res_fis,
 209                      ((uint64_t)pr->fis_addr_hi << 32) | pr->fis_addr, 256);
 210             break;
 211         case PORT_FIS_ADDR_HI:
 212             pr->fis_addr_hi = val;
 213             map_page(&s->dev[port].res_fis,
 214                      ((uint64_t)pr->fis_addr_hi << 32) | pr->fis_addr, 256);
 215             break;
 216         case PORT_IRQ_STAT:
 217             pr->irq_stat &= ~val;
 218             break;
 219         case PORT_IRQ_MASK:
 220             pr->irq_mask = val & 0xfdc000ff;
 221             ahci_check_irq(s);
 222             break;
 223         case PORT_CMD:
 224             pr->cmd = val & ~(PORT_CMD_LIST_ON | PORT_CMD_FIS_ON);
 225
 226             if (pr->cmd & PORT_CMD_START) {
 227                 pr->cmd |= PORT_CMD_LIST_ON;
 228             }
 229
 230             if (pr->cmd & PORT_CMD_FIS_RX) {
 231                 pr->cmd |= PORT_CMD_FIS_ON;
 232             }
 233
 234             /* XXX usually the FIS would be pending on the bus here and
 235                    issuing deferred until the OS enables FIS receival.
 236                    Instead, we only submit it once - which works in most
 237                    cases, but is a hack. */
 238             if ((pr->cmd & PORT_CMD_FIS_ON) &&
 239                 !s->dev[port].init_d2h_sent) {
 240                 ahci_init_d2h(&s->dev[port]);
 241                 s->dev[port].init_d2h_sent = 1;
 242             }
 243
 244             check_cmd(s, port);
 245             break;
 246         case PORT_TFDATA:
 247             s->dev[port].port.ifs[0].error = (val >> 8) & 0xff;
 248             s->dev[port].port.ifs[0].status = val & 0xff;
 249             break;
 250         case PORT_SIG:
 251             pr->sig = val;
 252             break;
 253         case PORT_SCR_STAT:
 254             pr->scr_stat = val;
 255             break;
 256         case PORT_SCR_CTL:
 257             if (((pr->scr_ctl & AHCI_SCR_SCTL_DET) == 1) &&
 258                 ((val & AHCI_SCR_SCTL_DET) == 0)) {
 259                 ahci_reset_port(s, port);
 260             }
 261             pr->scr_ctl = val;
 262             break;
 263         case PORT_SCR_ERR:
 264             pr->scr_err &= ~val;
 265             break;
 266         case PORT_SCR_ACT:
 267             /* RW1 */
 268             pr->scr_act |= val;
 269             break;
 270         case PORT_CMD_ISSUE:
 271             pr->cmd_issue |= val;
 272             check_cmd(s, port);
 273             break;
 274         default:
 275             break;
 276     }
 277 }
 278
 279 static uint32_t ahci_mem_readl(void *ptr, target_phys_addr_t addr)
 280 {
 281     AHCIState *s = ptr;
 282     uint32_t val = 0;
 283
 284     addr = addr & 0xfff;
 285     if (addr < AHCI_GENERIC_HOST_CONTROL_REGS_MAX_ADDR) {
 286         switch (addr) {
 287         case HOST_CAP:
 288             val = s->control_regs.cap;
 289             break;
 290         case HOST_CTL:
 291             val = s->control_regs.ghc;
 292             break;
 293         case HOST_IRQ_STAT:
 294             val = s->control_regs.irqstatus;
 295             break;
 296         case HOST_PORTS_IMPL:
 297             val = s->control_regs.impl;
 298             break;
 299         case HOST_VERSION:
 300             val = s->control_regs.version;
 301             break;
 302         }
 303
 304         DPRINTF(-1, "(addr 0x%08X), val 0x%08X\n", (unsigned) addr, val);
 305     } else if ((addr >= AHCI_PORT_REGS_START_ADDR) &&
 306                (addr < (AHCI_PORT_REGS_START_ADDR +
 307                 (s->ports * AHCI_PORT_ADDR_OFFSET_LEN)))) {
 308         val = ahci_port_read(s, (addr - AHCI_PORT_REGS_START_ADDR) >> 7,
 309                              addr & AHCI_PORT_ADDR_OFFSET_MASK);
 310     }
 311
 312     return val;
 313 }
 314
 315
 316
 317 static void ahci_mem_writel(void *ptr, target_phys_addr_t addr, uint32_t val)
 318 {
 319     AHCIState *s = ptr;
 320     addr = addr & 0xfff;
 321
 322     /* Only aligned reads are allowed on AHCI */
 323     if (addr & 3) {
 324         fprintf(stderr, "ahci: Mis-aligned write to addr 0x"
 325                 TARGET_FMT_plx "\n", addr);
 326         return;
 327     }
 328
 329     if (addr < AHCI_GENERIC_HOST_CONTROL_REGS_MAX_ADDR) {
 330         DPRINTF(-1, "(addr 0x%08X), val 0x%08X\n", (unsigned) addr, val);
 331
 332         switch (addr) {
 333             case HOST_CAP: /* R/WO, RO */
 334                 /* FIXME handle R/WO */
 335                 break;
 336             case HOST_CTL: /* R/W */
 337                 if (val & HOST_CTL_RESET) {
 338                     DPRINTF(-1, "HBA Reset\n");
 339                     ahci_reset(container_of(s, AHCIPCIState, ahci));
 340                 } else {
 341                     s->control_regs.ghc = (val & 0x3) | HOST_CTL_AHCI_EN;
 342                     ahci_check_irq(s);
 343                 }
 344                 break;
 345             case HOST_IRQ_STAT: /* R/WC, RO */
 346                 s->control_regs.irqstatus &= ~val;
 347                 ahci_check_irq(s);
 348                 break;
 349             case HOST_PORTS_IMPL: /* R/WO, RO */
 350                 /* FIXME handle R/WO */
 351                 break;
 352             case HOST_VERSION: /* RO */
 353                 /* FIXME report write? */
 354                 break;
 355             default:
 356                 DPRINTF(-1, "write to unknown register 0x%x\n", (unsigned)addr);
 357         }
 358     } else if ((addr >= AHCI_PORT_REGS_START_ADDR) &&
 359                (addr < (AHCI_PORT_REGS_START_ADDR +
 360                 (s->ports * AHCI_PORT_ADDR_OFFSET_LEN)))) {
 361         ahci_port_write(s, (addr - AHCI_PORT_REGS_START_ADDR) >> 7,
 362                         addr & AHCI_PORT_ADDR_OFFSET_MASK, val);
 363     }
 364
 365 }
 366
 367 static CPUReadMemoryFunc * const ahci_readfn[3]={
 368     ahci_mem_readl,
 369     ahci_mem_readl,
 370     ahci_mem_readl
 371 };
 372
 373 static CPUWriteMemoryFunc * const ahci_writefn[3]={
 374     ahci_mem_writel,
 375     ahci_mem_writel,
 376     ahci_mem_writel
 377 };
 378
 379 static void ahci_reg_init(AHCIState *s)
 380 {
 381     int i;
 382
 383     s->control_regs.cap = (s->ports - 1) |
 384                           (AHCI_NUM_COMMAND_SLOTS << 8) |
 385                           (AHCI_SUPPORTED_SPEED_GEN1 << AHCI_SUPPORTED_SPEED) |
 386                           HOST_CAP_NCQ | HOST_CAP_AHCI;
 387
 388     s->control_regs.impl = (1 << s->ports) - 1;
 389
 390     s->control_regs.version = AHCI_VERSION_1_0;
 391
 392     for (i = 0; i < s->ports; i++) {
 393         s->dev[i].port_state = STATE_RUN;
 394     }
 395 }
 396
 397 static uint32_t read_from_sglist(uint8_t *buffer, uint32_t len,
 398                                  QEMUSGList *sglist)
 399 {
 400     uint32_t i = 0;
 401     uint32_t total = 0, once;
 402     ScatterGatherEntry *cur_prd;
 403     uint32_t sgcount;
 404
 405     cur_prd = sglist->sg;
 406     sgcount = sglist->nsg;
 407     for (i = 0; len && sgcount; i++) {
 408         once = MIN(cur_prd->len, len);
 409         cpu_physical_memory_read(cur_prd->base, buffer, once);
 410         cur_prd++;
 411         sgcount--;
 412         len -= once;
 413         buffer += once;
 414         total += once;
 415     }
 416
 417     return total;
 418 }
 419
 420 static uint32_t write_to_sglist(uint8_t *buffer, uint32_t len,
 421                                 QEMUSGList *sglist)
 422 {
 423     uint32_t i = 0;
 424     uint32_t total = 0, once;
 425     ScatterGatherEntry *cur_prd;
 426     uint32_t sgcount;
 427
 428     DPRINTF(-1, "total: 0x%x bytes\n", len);
 429
 430     cur_prd = sglist->sg;
 431     sgcount = sglist->nsg;
 432     for (i = 0; len && sgcount; i++) {
 433         once = MIN(cur_prd->len, len);
 434         DPRINTF(-1, "write 0x%x bytes to 0x%lx\n", once, (long)cur_prd->base);
 435         cpu_physical_memory_write(cur_prd->base, buffer, once);
 436         cur_prd++;
 437         sgcount--;
 438         len -= once;
 439         buffer += once;
 440         total += once;
 441     }
 442
 443     return total;
 444 }
 445
 446 static void check_cmd(AHCIState *s, int port)
 447 {
 448     AHCIPortRegs *pr = &s->dev[port].port_regs;
 449     int slot;
 450
 451     if ((pr->cmd & PORT_CMD_START) && pr->cmd_issue) {
 452         for (slot = 0; (slot < 32) && pr->cmd_issue; slot++) {
 453             if ((pr->cmd_issue & (1 << slot)) &&
 454                 !handle_cmd(s, port, slot)) {
 455                 pr->cmd_issue &= ~(1 << slot);
 456             }
 457         }
 458     }
 459 }
 460
 461 static void ahci_check_cmd_bh(void *opaque)
 462 {
 463     AHCIDevice *ad = opaque;
 464
 465     qemu_bh_delete(ad->check_bh);
 466     ad->check_bh = NULL;
 467
 468     if ((ad->busy_slot != -1) &&
 469         !(ad->port.ifs[0].status & (BUSY_STAT|DRQ_STAT))) {
 470         /* no longer busy */
 471         ad->port_regs.cmd_issue &= ~(1 << ad->busy_slot);
 472         ad->busy_slot = -1;
 473     }
 474
 475     check_cmd(ad->hba, ad->port_no);
 476 }
 477
 478 static void ahci_init_d2h(AHCIDevice *ad)
 479 {
 480     uint8_t init_fis[0x20];
 481     IDEState *ide_state = &ad->port.ifs[0];
 482
 483     memset(init_fis, 0, sizeof(init_fis));
 484
 485     init_fis[4] = 1;
 486     init_fis[12] = 1;
 487
 488     if (ide_state->drive_kind == IDE_CD) {
 489         init_fis[5] = ide_state->lcyl;
 490         init_fis[6] = ide_state->hcyl;
 491     }
 492
 493     ahci_write_fis_d2h(ad, init_fis);
 494 }
 495
 496 static void ahci_reset_port(AHCIState *s, int port)
 497 {
 498     AHCIDevice *d = &s->dev[port];
 499     AHCIPortRegs *pr = &d->port_regs;
 500     IDEState *ide_state = &d->port.ifs[0];
 501     int i;
 502
 503     DPRINTF(port, "reset port\n");
 504
 505     ide_bus_reset(&d->port);
 506     ide_state->ncq_queues = AHCI_MAX_CMDS;
 507
 508     pr->irq_stat = 0;
 509     pr->irq_mask = 0;
 510     pr->scr_stat = 0;
 511     pr->scr_ctl = 0;
 512     pr->scr_err = 0;
 513     pr->scr_act = 0;
 514     d->busy_slot = -1;
 515     d->init_d2h_sent = 0;
 516
 517     ide_state = &s->dev[port].port.ifs[0];
 518     if (!ide_state->bs) {
 519         return;
 520     }
 521
 522     /* reset ncq queue */
 523     for (i = 0; i < AHCI_MAX_CMDS; i++) {
 524         NCQTransferState *ncq_tfs = &s->dev[port].ncq_tfs[i];
 525         if (!ncq_tfs->used) {
 526             continue;
 527         }
 528
 529         if (ncq_tfs->aiocb) {
 530             bdrv_aio_cancel(ncq_tfs->aiocb);
 531             ncq_tfs->aiocb = NULL;
 532         }
 533
 534         qemu_sglist_destroy(&ncq_tfs->sglist);
 535         ncq_tfs->used = 0;
 536     }
 537
 538     s->dev[port].port_state = STATE_RUN;
 539     if (!ide_state->bs) {
 540         s->dev[port].port_regs.sig = 0;
 541         ide_state->status = SEEK_STAT | WRERR_STAT;
 542     } else if (ide_state->drive_kind == IDE_CD) {
 543         s->dev[port].port_regs.sig = SATA_SIGNATURE_CDROM;
 544         ide_state->lcyl = 0x14;
 545         ide_state->hcyl = 0xeb;
 546         DPRINTF(port, "set lcyl = %d\n", ide_state->lcyl);
 547         ide_state->status = SEEK_STAT | WRERR_STAT | READY_STAT;
 548     } else {
 549         s->dev[port].port_regs.sig = SATA_SIGNATURE_DISK;
 550         ide_state->status = SEEK_STAT | WRERR_STAT;
 551     }
 552
 553     ide_state->error = 1;
 554     ahci_init_d2h(d);
 555 }
 556
 557 static void debug_print_fis(uint8_t *fis, int cmd_len)
 558 {
 559 #ifdef DEBUG_AHCI
 560     int i;
 561
 562     fprintf(stderr, "fis:");
 563     for (i = 0; i < cmd_len; i++) {
 564         if ((i & 0xf) == 0) {
 565             fprintf(stderr, "\n%02x:",i);
 566         }
 567         fprintf(stderr, "%02x ",fis[i]);
 568     }
 569     fprintf(stderr, "\n");
 570 #endif
 571 }
 572
 573 static void ahci_write_fis_sdb(AHCIState *s, int port, uint32_t finished)
 574 {
 575     AHCIPortRegs *pr = &s->dev[port].port_regs;
 576     IDEState *ide_state;
 577     uint8_t *sdb_fis;
 578
 579     if (!s->dev[port].res_fis ||
 580         !(pr->cmd & PORT_CMD_FIS_RX)) {
 581         return;
 582     }
 583
 584     sdb_fis = &s->dev[port].res_fis[RES_FIS_SDBFIS];
 585     ide_state = &s->dev[port].port.ifs[0];
 586
 587     /* clear memory */
 588     *(uint32_t*)sdb_fis = 0;
 589
 590     /* write values */
 591     sdb_fis[0] = ide_state->error;
 592     sdb_fis[2] = ide_state->status & 0x77;
 593     s->dev[port].finished |= finished;
 594     *(uint32_t*)(sdb_fis + 4) = cpu_to_le32(s->dev[port].finished);
 595
 596     ahci_trigger_irq(s, &s->dev[port], PORT_IRQ_STAT_SDBS);
 597 }
 598
 599 static void ahci_write_fis_d2h(AHCIDevice *ad, uint8_t *cmd_fis)
 600 {
 601     AHCIPortRegs *pr = &ad->port_regs;
 602     uint8_t *d2h_fis;
 603     int i;
 604     target_phys_addr_t cmd_len = 0x80;
 605     int cmd_mapped = 0;
 606
 607     if (!ad->res_fis || !(pr->cmd & PORT_CMD_FIS_RX)) {
 608         return;
 609     }
 610
 611     if (!cmd_fis) {
 612         /* map cmd_fis */
 613         uint64_t tbl_addr = le64_to_cpu(ad->cur_cmd->tbl_addr);
 614         cmd_fis = cpu_physical_memory_map(tbl_addr, &cmd_len, 0);
 615         cmd_mapped = 1;
 616     }
 617
 618     d2h_fis = &ad->res_fis[RES_FIS_RFIS];
 619
 620     d2h_fis[0] = 0x34;
 621     d2h_fis[1] = (ad->hba->control_regs.irqstatus ? (1 << 6) : 0);
 622     d2h_fis[2] = ad->port.ifs[0].status;
 623     d2h_fis[3] = ad->port.ifs[0].error;
 624
 625     d2h_fis[4] = cmd_fis[4];
 626     d2h_fis[5] = cmd_fis[5];
 627     d2h_fis[6] = cmd_fis[6];
 628     d2h_fis[7] = cmd_fis[7];
 629     d2h_fis[8] = cmd_fis[8];
 630     d2h_fis[9] = cmd_fis[9];
 631     d2h_fis[10] = cmd_fis[10];
 632     d2h_fis[11] = cmd_fis[11];
 633     d2h_fis[12] = cmd_fis[12];
 634     d2h_fis[13] = cmd_fis[13];
 635     for (i = 14; i < 0x20; i++) {
 636         d2h_fis[i] = 0;
 637     }
 638
 639     if (d2h_fis[2] & ERR_STAT) {
 640         ahci_trigger_irq(ad->hba, ad, PORT_IRQ_STAT_TFES);
 641     }
 642
 643     ahci_trigger_irq(ad->hba, ad, PORT_IRQ_D2H_REG_FIS);
 644
 645     if (cmd_mapped) {
 646         cpu_physical_memory_unmap(cmd_fis, cmd_len, 0, cmd_len);
 647     }
 648 }
 649
 650 static int ahci_populate_sglist(AHCIDevice *ad, QEMUSGList *sglist)
 651 {
 652     AHCICmdHdr *cmd = ad->cur_cmd;
 653     uint32_t opts = le32_to_cpu(cmd->opts);
 654     uint64_t prdt_addr = le64_to_cpu(cmd->tbl_addr) + 0x80;
 655     int sglist_alloc_hint = opts >> AHCI_CMD_HDR_PRDT_LEN;
 656     target_phys_addr_t prdt_len = (sglist_alloc_hint * sizeof(AHCI_SG));
 657     target_phys_addr_t real_prdt_len = prdt_len;
 658     uint8_t *prdt;
 659     int i;
 660     int r = 0;
 661
 662     if (!sglist_alloc_hint) {
 663         DPRINTF(ad->port_no, "no sg list given by guest: 0x%08x\n", opts);
 664         return -1;
 665     }
 666
 667     /* map PRDT */
 668     if (!(prdt = cpu_physical_memory_map(prdt_addr, &prdt_len, 0))){
 669         DPRINTF(ad->port_no, "map failed\n");
 670         return -1;
 671     }
 672
 673     if (prdt_len < real_prdt_len) {
 674         DPRINTF(ad->port_no, "mapped less than expected\n");
 675         r = -1;
 676         goto out;
 677     }
 678
 679     /* Get entries in the PRDT, init a qemu sglist accordingly */
 680     if (sglist_alloc_hint > 0) {
 681         AHCI_SG *tbl = (AHCI_SG *)prdt;
 682
 683         qemu_sglist_init(sglist, sglist_alloc_hint);
 684         for (i = 0; i < sglist_alloc_hint; i++) {
 685             /* flags_size is zero-based */
 686             qemu_sglist_add(sglist, le64_to_cpu(tbl[i].addr),
 687                             le32_to_cpu(tbl[i].flags_size) + 1);
 688         }
 689     }
 690
 691 out:
 692     cpu_physical_memory_unmap(prdt, prdt_len, 0, prdt_len);
 693     return r;
 694 }
 695
 696 static void ncq_cb(void *opaque, int ret)
 697 {
 698     NCQTransferState *ncq_tfs = (NCQTransferState *)opaque;
 699     IDEState *ide_state = &ncq_tfs->drive->port.ifs[0];
 700
 701     /* Clear bit for this tag in SActive */
 702     ncq_tfs->drive->port_regs.scr_act &= ~(1 << ncq_tfs->tag);
 703
 704     if (ret < 0) {
 705         /* error */
 706         ide_state->error = ABRT_ERR;
 707         ide_state->status = READY_STAT | ERR_STAT;
 708         ncq_tfs->drive->port_regs.scr_err |= (1 << ncq_tfs->tag);
 709     } else {
 710         ide_state->status = READY_STAT | SEEK_STAT;
 711     }
 712
 713     ahci_write_fis_sdb(ncq_tfs->drive->hba, ncq_tfs->drive->port_no,
 714                        (1 << ncq_tfs->tag));
 715
 716     DPRINTF(ncq_tfs->drive->port_no, "NCQ transfer tag %d finished\n",
 717             ncq_tfs->tag);
 718
 719     qemu_sglist_destroy(&ncq_tfs->sglist);
 720     ncq_tfs->used = 0;
 721 }
 722
 723 static void process_ncq_command(AHCIState *s, int port, uint8_t *cmd_fis,
 724                                 int slot)
 725 {
 726     NCQFrame *ncq_fis = (NCQFrame*)cmd_fis;
 727     uint8_t tag = ncq_fis->tag >> 3;
 728     NCQTransferState *ncq_tfs = &s->dev[port].ncq_tfs[tag];
 729
 730     if (ncq_tfs->used) {
 731         /* error - already in use */
 732         fprintf(stderr, "%s: tag %d already used\n", __FUNCTION__, tag);
 733         return;
 734     }
 735
 736     ncq_tfs->used = 1;
 737     ncq_tfs->drive = &s->dev[port];
 738     ncq_tfs->slot = slot;
 739     ncq_tfs->lba = ((uint64_t)ncq_fis->lba5 << 40) |
 740                    ((uint64_t)ncq_fis->lba4 << 32) |
 741                    ((uint64_t)ncq_fis->lba3 << 24) |
 742                    ((uint64_t)ncq_fis->lba2 << 16) |
 743                    ((uint64_t)ncq_fis->lba1 << 8) |
 744                    (uint64_t)ncq_fis->lba0;
 745
 746     /* Note: We calculate the sector count, but don't currently rely on it.
 747      * The total size of the DMA buffer tells us the transfer size instead. */
 748     ncq_tfs->sector_count = ((uint16_t)ncq_fis->sector_count_high << 8) |
 749                                 ncq_fis->sector_count_low;
 750
 751     DPRINTF(port, "NCQ transfer LBA from %ld to %ld, drive max %ld\n",
 752             ncq_tfs->lba, ncq_tfs->lba + ncq_tfs->sector_count - 2,
 753             s->dev[port].port.ifs[0].nb_sectors - 1);
 754
 755     ahci_populate_sglist(&s->dev[port], &ncq_tfs->sglist);
 756     ncq_tfs->tag = tag;
 757
 758     switch(ncq_fis->command) {
 759         case READ_FPDMA_QUEUED:
 760             DPRINTF(port, "NCQ reading %d sectors from LBA %ld, tag %d\n",
 761                     ncq_tfs->sector_count-1, ncq_tfs->lba, ncq_tfs->tag);
 762             ncq_tfs->is_read = 1;
 763
 764             DPRINTF(port, "tag %d aio read %ld\n", ncq_tfs->tag, ncq_tfs->lba);
 765             ncq_tfs->aiocb = dma_bdrv_read(ncq_tfs->drive->port.ifs[0].bs,
 766                                            &ncq_tfs->sglist, ncq_tfs->lba,
 767                                            ncq_cb, ncq_tfs);
 768             break;
 769         case WRITE_FPDMA_QUEUED:
 770             DPRINTF(port, "NCQ writing %d sectors to LBA %ld, tag %d\n",
 771                     ncq_tfs->sector_count-1, ncq_tfs->lba, ncq_tfs->tag);
 772             ncq_tfs->is_read = 0;
 773
 774             DPRINTF(port, "tag %d aio write %ld\n", ncq_tfs->tag, ncq_tfs->lba);
 775             ncq_tfs->aiocb = dma_bdrv_write(ncq_tfs->drive->port.ifs[0].bs,
 776                                             &ncq_tfs->sglist, ncq_tfs->lba,
 777                                             ncq_cb, ncq_tfs);
 778             break;
 779         default:
 780             DPRINTF(port, "error: tried to process non-NCQ command as NCQ\n");
 781             qemu_sglist_destroy(&ncq_tfs->sglist);
 782             break;
 783     }
 784 }
 785
 786 static int handle_cmd(AHCIState *s, int port, int slot)
 787 {
 788     IDEState *ide_state;
 789     uint32_t opts;
 790     uint64_t tbl_addr;
 791     AHCICmdHdr *cmd;
 792     uint8_t *cmd_fis;
 793     target_phys_addr_t cmd_len;
 794
 795     if (s->dev[port].port.ifs[0].status & (BUSY_STAT|DRQ_STAT)) {
 796         /* Engine currently busy, try again later */
 797         DPRINTF(port, "engine busy\n");
 798         return -1;
 799     }
 800
 801     cmd = &((AHCICmdHdr *)s->dev[port].lst)[slot];
 802
 803     if (!s->dev[port].lst) {
 804         DPRINTF(port, "error: lst not given but cmd handled");
 805         return -1;
 806     }
 807
 808     /* remember current slot handle for later */
 809     s->dev[port].cur_cmd = cmd;
 810
 811     opts = le32_to_cpu(cmd->opts);
 812     tbl_addr = le64_to_cpu(cmd->tbl_addr);
 813
 814     cmd_len = 0x80;
 815     cmd_fis = cpu_physical_memory_map(tbl_addr, &cmd_len, 1);
 816
 817     if (!cmd_fis) {
 818         DPRINTF(port, "error: guest passed us an invalid cmd fis\n");
 819         return -1;
 820     }
 821
 822     /* The device we are working for */
 823     ide_state = &s->dev[port].port.ifs[0];
 824
 825     if (!ide_state->bs) {
 826         DPRINTF(port, "error: guest accessed unused port");
 827         goto out;
 828     }
 829
 830     debug_print_fis(cmd_fis, 0x90);
 831     //debug_print_fis(cmd_fis, (opts & AHCI_CMD_HDR_CMD_FIS_LEN) * 4);
 832
 833     switch (cmd_fis[0]) {
 834         case SATA_FIS_TYPE_REGISTER_H2D:
 835             break;
 836         default:
 837             DPRINTF(port, "unknown command cmd_fis[0]=%02x cmd_fis[1]=%02x "
 838                           "cmd_fis[2]=%02x\n", cmd_fis[0], cmd_fis[1],
 839                           cmd_fis[2]);
 840             goto out;
 841             break;
 842     }
 843
 844     switch (cmd_fis[1]) {
 845         case SATA_FIS_REG_H2D_UPDATE_COMMAND_REGISTER:
 846             break;
 847         case 0:
 848             break;
 849         default:
 850             DPRINTF(port, "unknown command cmd_fis[0]=%02x cmd_fis[1]=%02x "
 851                           "cmd_fis[2]=%02x\n", cmd_fis[0], cmd_fis[1],
 852                           cmd_fis[2]);
 853             goto out;
 854             break;
 855     }
 856
 857     switch (s->dev[port].port_state) {
 858         case STATE_RUN:
 859             if (cmd_fis[15] & ATA_SRST) {
 860                 s->dev[port].port_state = STATE_RESET;
 861             }
 862             break;
 863         case STATE_RESET:
 864             if (!(cmd_fis[15] & ATA_SRST)) {
 865                 ahci_reset_port(s, port);
 866             }
 867             break;
 868     }
 869
 870     if (cmd_fis[1] == SATA_FIS_REG_H2D_UPDATE_COMMAND_REGISTER) {
 871
 872         /* Check for NCQ command */
 873         if ((cmd_fis[2] == READ_FPDMA_QUEUED) ||
 874             (cmd_fis[2] == WRITE_FPDMA_QUEUED)) {
 875             process_ncq_command(s, port, cmd_fis, slot);
 876             goto out;
 877         }
 878
 879         /* Decompose the FIS  */
 880         ide_state->nsector = (int64_t)((cmd_fis[13] << 8) | cmd_fis[12]);
 881         ide_state->feature = cmd_fis[3];
 882         if (!ide_state->nsector) {
 883             ide_state->nsector = 256;
 884         }
 885
 886         if (ide_state->drive_kind != IDE_CD) {
 887             /*
 888              * We set the sector depending on the sector defined in the FIS.
 889              * Unfortunately, the spec isn't exactly obvious on this one.
 890              *
 891              * Apparently LBA48 commands set fis bytes 10,9,8,6,5,4 to the
 892              * 48 bit sector number. ATA_CMD_READ_DMA_EXT is an example for
 893              * such a command.
 894              *
 895              * Non-LBA48 commands however use 7[lower 4 bits],6,5,4 to define a
 896              * 28-bit sector number. ATA_CMD_READ_DMA is an example for such
 897              * a command.
 898              *
 899              * Since the spec doesn't explicitly state what each field should
 900              * do, I simply assume non-used fields as reserved and OR everything
 901              * together, independent of the command.
 902              */
 903             ide_set_sector(ide_state, ((uint64_t)cmd_fis[10] << 40)
 904                                     | ((uint64_t)cmd_fis[9] << 32)
 905                                     /* This is used for LBA48 commands */
 906                                     | ((uint64_t)cmd_fis[8] << 24)
 907                                     /* This is used for non-LBA48 commands */
 908                                     | ((uint64_t)(cmd_fis[7] & 0xf) << 24)
 909                                     | ((uint64_t)cmd_fis[6] << 16)
 910                                     | ((uint64_t)cmd_fis[5] << 8)
 911                                     | cmd_fis[4]);
 912         }
 913
 914         /* Copy the ACMD field (ATAPI packet, if any) from the AHCI command
 915          * table to ide_state->io_buffer
 916          */
 917         if (opts & AHCI_CMD_ATAPI) {
 918             memcpy(ide_state->io_buffer, &cmd_fis[AHCI_COMMAND_TABLE_ACMD], 0x10);
 919             ide_state->lcyl = 0x14;
 920             ide_state->hcyl = 0xeb;
 921             debug_print_fis(ide_state->io_buffer, 0x10);
 922             ide_state->feature = IDE_FEATURE_DMA;
 923             s->dev[port].done_atapi_packet = 0;
 924             /* XXX send PIO setup FIS */
 925         }
 926
 927         ide_state->error = 0;
 928
 929         /* Reset transferred byte counter */
 930         cmd->status = 0;
 931
 932         /* We're ready to process the command in FIS byte 2. */
 933         ide_exec_cmd(&s->dev[port].port, cmd_fis[2]);
 934
 935         if (s->dev[port].port.ifs[0].status & READY_STAT) {
 936             ahci_write_fis_d2h(&s->dev[port], cmd_fis);
 937         }
 938     }
 939
 940 out:
 941     cpu_physical_memory_unmap(cmd_fis, cmd_len, 1, cmd_len);
 942
 943     if (s->dev[port].port.ifs[0].status & (BUSY_STAT|DRQ_STAT)) {
 944         /* async command, complete later */
 945         s->dev[port].busy_slot = slot;
 946         return -1;
 947     }
 948
 949     /* done handling the command */
 950     return 0;
 951 }
 952
 953 /* DMA dev <-> ram */
 954 static int ahci_start_transfer(IDEDMA *dma)
 955 {
 956     AHCIDevice *ad = DO_UPCAST(AHCIDevice, dma, dma);
 957     IDEState *s = &ad->port.ifs[0];
 958     uint32_t size = (uint32_t)(s->data_end - s->data_ptr);
 959     /* write == ram -> device */
 960     uint32_t opts = le32_to_cpu(ad->cur_cmd->opts);
 961     int is_write = opts & AHCI_CMD_WRITE;
 962     int is_atapi = opts & AHCI_CMD_ATAPI;
 963     int has_sglist = 0;
 964
 965     if (is_atapi && !ad->done_atapi_packet) {
 966         /* already prepopulated iobuffer */
 967         ad->done_atapi_packet = 1;
 968         goto out;
 969     }
 970
 971     if (!ahci_populate_sglist(ad, &s->sg)) {
 972         has_sglist = 1;
 973     }
 974
 975     DPRINTF(ad->port_no, "%sing %d bytes on %s w/%s sglist\n",
 976             is_write ? "writ" : "read", size, is_atapi ? "atapi" : "ata",
 977             has_sglist ? "" : "o");
 978
 979     if (is_write && has_sglist && (s->data_ptr < s->data_end)) {
 980         read_from_sglist(s->data_ptr, size, &s->sg);
 981     }
 982
 983     if (!is_write && has_sglist && (s->data_ptr < s->data_end)) {
 984         write_to_sglist(s->data_ptr, size, &s->sg);
 985     }
 986
 987     /* update number of transferred bytes */
 988     ad->cur_cmd->status = cpu_to_le32(le32_to_cpu(ad->cur_cmd->status) + size);
 989
 990 out:
 991     /* declare that we processed everything */
 992     s->data_ptr = s->data_end;
 993
 994     if (has_sglist) {
 995         qemu_sglist_destroy(&s->sg);
 996     }
 997
 998     s->end_transfer_func(s);
 999
1000     if (!(s->status & DRQ_STAT)) {
1001         /* done with DMA */
1002         ahci_trigger_irq(ad->hba, ad, PORT_IRQ_STAT_DSS);
1003     }
1004
1005     return 0;
1006 }
1007
1008 static void ahci_start_dma(IDEDMA *dma, IDEState *s,
1009                            BlockDriverCompletionFunc *dma_cb)
1010 {
1011     AHCIDevice *ad = DO_UPCAST(AHCIDevice, dma, dma);
1012
1013     DPRINTF(ad->port_no, "\n");
1014     ad->dma_cb = dma_cb;
1015     ad->dma_status |= BM_STATUS_DMAING;
1016     dma_cb(s, 0);
1017 }
1018
1019 static int ahci_dma_prepare_buf(IDEDMA *dma, int is_write)
1020 {
1021     AHCIDevice *ad = DO_UPCAST(AHCIDevice, dma, dma);
1022     IDEState *s = &ad->port.ifs[0];
1023     int i;
1024
1025     ahci_populate_sglist(ad, &s->sg);
1026
1027     s->io_buffer_size = 0;
1028     for (i = 0; i < s->sg.nsg; i++) {
1029         s->io_buffer_size += s->sg.sg[i].len;
1030     }
1031
1032     DPRINTF(ad->port_no, "len=%#x\n", s->io_buffer_size);
1033     return s->io_buffer_size != 0;
1034 }
1035
1036 static int ahci_dma_rw_buf(IDEDMA *dma, int is_write)
1037 {
1038     AHCIDevice *ad = DO_UPCAST(AHCIDevice, dma, dma);
1039     IDEState *s = &ad->port.ifs[0];
1040     uint8_t *p = s->io_buffer + s->io_buffer_index;
1041     int l = s->io_buffer_size - s->io_buffer_index;
1042
1043     if (ahci_populate_sglist(ad, &s->sg)) {
1044         return 0;
1045     }
1046
1047     if (is_write) {
1048         write_to_sglist(p, l, &s->sg);
1049     } else {
1050         read_from_sglist(p, l, &s->sg);
1051     }
1052
1053     /* update number of transferred bytes */
1054     ad->cur_cmd->status = cpu_to_le32(le32_to_cpu(ad->cur_cmd->status) + l);
1055     s->io_buffer_index += l;
1056
1057     DPRINTF(ad->port_no, "len=%#x\n", l);
1058
1059     return 1;
1060 }
1061
1062 static int ahci_dma_set_unit(IDEDMA *dma, int unit)
1063 {
1064     /* only a single unit per link */
1065     return 0;
1066 }
1067
1068 static int ahci_dma_add_status(IDEDMA *dma, int status)
1069 {
1070     AHCIDevice *ad = DO_UPCAST(AHCIDevice, dma, dma);
1071     ad->dma_status |= status;
1072     DPRINTF(ad->port_no, "set status: %x\n", status);
1073
1074     if (status & BM_STATUS_INT) {
1075         ahci_trigger_irq(ad->hba, ad, PORT_IRQ_STAT_DSS);
1076     }
1077
1078     return 0;
1079 }
1080
1081 static int ahci_dma_set_inactive(IDEDMA *dma)
1082 {
1083     AHCIDevice *ad = DO_UPCAST(AHCIDevice, dma, dma);
1084
1085     DPRINTF(ad->port_no, "dma done\n");
1086
1087     /* update d2h status */
1088     ahci_write_fis_d2h(ad, NULL);
1089
1090     ad->dma_cb = NULL;
1091
1092     if (!ad->check_bh) {
1093         /* maybe we still have something to process, check later */
1094         ad->check_bh = qemu_bh_new(ahci_check_cmd_bh, ad);
1095         qemu_bh_schedule(ad->check_bh);
1096     }
1097
1098     return 0;
1099 }
1100
1101 static void ahci_irq_set(void *opaque, int n, int level)
1102 {
1103 }
1104
1105 static void ahci_dma_restart_cb(void *opaque, int running, int reason)
1106 {
1107 }
1108
1109 static int ahci_dma_reset(IDEDMA *dma)
1110 {
1111     return 0;
1112 }
1113
1114 static const IDEDMAOps ahci_dma_ops = {
1115     .start_dma = ahci_start_dma,
1116     .start_transfer = ahci_start_transfer,
1117     .prepare_buf = ahci_dma_prepare_buf,
1118     .rw_buf = ahci_dma_rw_buf,
1119     .set_unit = ahci_dma_set_unit,
1120     .add_status = ahci_dma_add_status,
1121     .set_inactive = ahci_dma_set_inactive,
1122     .restart_cb = ahci_dma_restart_cb,
1123     .reset = ahci_dma_reset,
1124 };
1125
1126 void ahci_init(AHCIState *s, DeviceState *qdev, int ports)
1127 {
1128     qemu_irq *irqs;
1129     int i;
1130
1131     s->ports = ports;
1132     s->dev = qemu_mallocz(sizeof(AHCIDevice) * ports);
1133     ahci_reg_init(s);
1134     s->mem = cpu_register_io_memory(ahci_readfn, ahci_writefn, s,
1135                                     DEVICE_LITTLE_ENDIAN);
1136     irqs = qemu_allocate_irqs(ahci_irq_set, s, s->ports);
1137
1138     for (i = 0; i < s->ports; i++) {
1139         AHCIDevice *ad = &s->dev[i];
1140
1141         ide_bus_new(&ad->port, qdev, i);
1142         ide_init2(&ad->port, irqs[i]);
1143
1144         ad->hba = s;
1145         ad->port_no = i;
1146         ad->port.dma = &ad->dma;
1147         ad->port.dma->ops = &ahci_dma_ops;
1148         ad->port_regs.cmd = PORT_CMD_SPIN_UP | PORT_CMD_POWER_ON;
1149     }
1150 }
1151
1152 void ahci_uninit(AHCIState *s)
1153 {
1154     qemu_free(s->dev);
1155 }
1156
1157 void ahci_reset(void *opaque)
1158 {
1159     struct AHCIPCIState *d = opaque;
1160     int i;
1161
1162     d->ahci.control_regs.irqstatus = 0;
1163     d->ahci.control_regs.ghc = 0;
1164
1165     for (i = 0; i < d->ahci.ports; i++) {
1166         ahci_reset_port(&d->ahci, i);
1167     }
1168 }