hw/pci/shpc.c

   1 #include "qemu/osdep.h"
   2 #include "qapi/error.h"
   3 #include "qemu/host-utils.h"
   4 #include "qemu/range.h"
   5 #include "qemu/error-report.h"
   6 #include "hw/pci/shpc.h"
   7 #include "migration/qemu-file-types.h"
   8 #include "hw/pci/pci.h"
   9 #include "hw/pci/pci_bus.h"
  10 #include "hw/pci/msi.h"
  11
  12 /* TODO: model power only and disabled slot states. */
  13 /* TODO: handle SERR and wakeups */
  14 /* TODO: consider enabling 66MHz support */
  15
  16 /* TODO: remove fully only on state DISABLED and LED off.
  17  * track state to properly record this. */
  18
  19 /* SHPC Working Register Set */
  20 #define SHPC_BASE_OFFSET  0x00 /* 4 bytes */
  21 #define SHPC_SLOTS_33     0x04 /* 4 bytes. Also encodes PCI-X slots. */
  22 #define SHPC_SLOTS_66     0x08 /* 4 bytes. */
  23 #define SHPC_NSLOTS       0x0C /* 1 byte */
  24 #define SHPC_FIRST_DEV    0x0D /* 1 byte */
  25 #define SHPC_PHYS_SLOT    0x0E /* 2 byte */
  26 #define SHPC_PHYS_NUM_MAX 0x7ff
  27 #define SHPC_PHYS_NUM_UP  0x2000
  28 #define SHPC_PHYS_MRL     0x4000
  29 #define SHPC_PHYS_BUTTON  0x8000
  30 #define SHPC_SEC_BUS      0x10 /* 2 bytes */
  31 #define SHPC_SEC_BUS_33   0x0
  32 #define SHPC_SEC_BUS_66   0x1 /* Unused */
  33 #define SHPC_SEC_BUS_MASK 0x7
  34 #define SHPC_MSI_CTL      0x12 /* 1 byte */
  35 #define SHPC_PROG_IFC     0x13 /* 1 byte */
  36 #define SHPC_PROG_IFC_1_0 0x1
  37 #define SHPC_CMD_CODE     0x14 /* 1 byte */
  38 #define SHPC_CMD_TRGT     0x15 /* 1 byte */
  39 #define SHPC_CMD_TRGT_MIN 0x1
  40 #define SHPC_CMD_TRGT_MAX 0x1f
  41 #define SHPC_CMD_STATUS   0x16 /* 2 bytes */
  42 #define SHPC_CMD_STATUS_BUSY          0x1
  43 #define SHPC_CMD_STATUS_MRL_OPEN      0x2
  44 #define SHPC_CMD_STATUS_INVALID_CMD   0x4
  45 #define SHPC_CMD_STATUS_INVALID_MODE  0x8
  46 #define SHPC_INT_LOCATOR  0x18 /* 4 bytes */
  47 #define SHPC_INT_COMMAND  0x1
  48 #define SHPC_SERR_LOCATOR 0x1C /* 4 bytes */
  49 #define SHPC_SERR_INT     0x20 /* 4 bytes */
  50 #define SHPC_INT_DIS      0x1
  51 #define SHPC_SERR_DIS     0x2
  52 #define SHPC_CMD_INT_DIS  0x4
  53 #define SHPC_ARB_SERR_DIS 0x8
  54 #define SHPC_CMD_DETECTED 0x10000
  55 #define SHPC_ARB_DETECTED 0x20000
  56  /* 4 bytes * slot # (start from 0) */
  57 #define SHPC_SLOT_REG(s)         (0x24 + (s) * 4)
  58  /* 2 bytes */
  59 #define SHPC_SLOT_STATUS(s)       (0x0 + SHPC_SLOT_REG(s))
  60
  61 /* Same slot state masks are used for command and status registers */
  62 #define SHPC_SLOT_STATE_MASK     0x03
  63 #define SHPC_SLOT_STATE_SHIFT \
  64     ctz32(SHPC_SLOT_STATE_MASK)
  65
  66 #define SHPC_STATE_NO       0x0
  67 #define SHPC_STATE_PWRONLY  0x1
  68 #define SHPC_STATE_ENABLED  0x2
  69 #define SHPC_STATE_DISABLED 0x3
  70
  71 #define SHPC_SLOT_PWR_LED_MASK   0xC
  72 #define SHPC_SLOT_PWR_LED_SHIFT \
  73     ctz32(SHPC_SLOT_PWR_LED_MASK)
  74 #define SHPC_SLOT_ATTN_LED_MASK  0x30
  75 #define SHPC_SLOT_ATTN_LED_SHIFT \
  76     ctz32(SHPC_SLOT_ATTN_LED_MASK)
  77
  78 #define SHPC_LED_NO     0x0
  79 #define SHPC_LED_ON     0x1
  80 #define SHPC_LED_BLINK  0x2
  81 #define SHPC_LED_OFF    0x3
  82
  83 #define SHPC_SLOT_STATUS_PWR_FAULT      0x40
  84 #define SHPC_SLOT_STATUS_BUTTON         0x80
  85 #define SHPC_SLOT_STATUS_MRL_OPEN       0x100
  86 #define SHPC_SLOT_STATUS_66             0x200
  87 #define SHPC_SLOT_STATUS_PRSNT_MASK     0xC00
  88 #define SHPC_SLOT_STATUS_PRSNT_EMPTY    0x3
  89 #define SHPC_SLOT_STATUS_PRSNT_25W      0x1
  90 #define SHPC_SLOT_STATUS_PRSNT_15W      0x2
  91 #define SHPC_SLOT_STATUS_PRSNT_7_5W     0x0
  92
  93 #define SHPC_SLOT_STATUS_PRSNT_PCIX     0x3000
  94
  95
  96  /* 1 byte */
  97 #define SHPC_SLOT_EVENT_LATCH(s)        (0x2 + SHPC_SLOT_REG(s))
  98  /* 1 byte */
  99 #define SHPC_SLOT_EVENT_SERR_INT_DIS(d, s) (0x3 + SHPC_SLOT_REG(s))
 100 #define SHPC_SLOT_EVENT_PRESENCE        0x01
 101 #define SHPC_SLOT_EVENT_ISOLATED_FAULT  0x02
 102 #define SHPC_SLOT_EVENT_BUTTON          0x04
 103 #define SHPC_SLOT_EVENT_MRL             0x08
 104 #define SHPC_SLOT_EVENT_CONNECTED_FAULT 0x10
 105 /* Bits below are used for Serr/Int disable only */
 106 #define SHPC_SLOT_EVENT_MRL_SERR_DIS    0x20
 107 #define SHPC_SLOT_EVENT_CONNECTED_FAULT_SERR_DIS 0x40
 108
 109 #define SHPC_MIN_SLOTS        1
 110 #define SHPC_MAX_SLOTS        31
 111 #define SHPC_SIZEOF(d)    SHPC_SLOT_REG((d)->shpc->nslots)
 112
 113 /* SHPC Slot identifiers */
 114
 115 /* Hotplug supported at 31 slots out of the total 32.  We reserve slot 0,
 116    and give the rest of them physical *and* pci numbers starting from 1, so
 117    they match logical numbers.  Note: this means that multiple slots must have
 118    different chassis number values, to make chassis+physical slot unique.
 119    TODO: make this configurable? */
 120 #define SHPC_IDX_TO_LOGICAL(slot) ((slot) + 1)
 121 #define SHPC_LOGICAL_TO_IDX(target) ((target) - 1)
 122 #define SHPC_IDX_TO_PCI(slot) ((slot) + 1)
 123 #define SHPC_PCI_TO_IDX(pci_slot) ((pci_slot) - 1)
 124 #define SHPC_IDX_TO_PHYSICAL(slot) ((slot) + 1)
 125
 126 static uint16_t shpc_get_status(SHPCDevice *shpc, int slot, uint16_t msk)
 127 {
 128     uint8_t *status = shpc->config + SHPC_SLOT_STATUS(slot);
 129     return (pci_get_word(status) & msk) >> ctz32(msk);
 130 }
 131
 132 static void shpc_set_status(SHPCDevice *shpc,
 133                             int slot, uint8_t value, uint16_t msk)
 134 {
 135     uint8_t *status = shpc->config + SHPC_SLOT_STATUS(slot);
 136     pci_word_test_and_clear_mask(status, msk);
 137     pci_word_test_and_set_mask(status, value << ctz32(msk));
 138 }
 139
 140 static void shpc_interrupt_update(PCIDevice *d)
 141 {
 142     SHPCDevice *shpc = d->shpc;
 143     int slot;
 144     int level = 0;
 145     uint32_t serr_int;
 146     uint32_t int_locator = 0;
 147
 148     /* Update interrupt locator register */
 149     for (slot = 0; slot < shpc->nslots; ++slot) {
 150         uint8_t event = shpc->config[SHPC_SLOT_EVENT_LATCH(slot)];
 151         uint8_t disable = shpc->config[SHPC_SLOT_EVENT_SERR_INT_DIS(d, slot)];
 152         uint32_t mask = 1U << SHPC_IDX_TO_LOGICAL(slot);
 153         if (event & ~disable) {
 154             int_locator |= mask;
 155         }
 156     }
 157     serr_int = pci_get_long(shpc->config + SHPC_SERR_INT);
 158     if ((serr_int & SHPC_CMD_DETECTED) && !(serr_int & SHPC_CMD_INT_DIS)) {
 159         int_locator |= SHPC_INT_COMMAND;
 160     }
 161     pci_set_long(shpc->config + SHPC_INT_LOCATOR, int_locator);
 162     level = (!(serr_int & SHPC_INT_DIS) && int_locator) ? 1 : 0;
 163     if (msi_enabled(d) && shpc->msi_requested != level)
 164         msi_notify(d, 0);
 165     else
 166         pci_set_irq(d, level);
 167     shpc->msi_requested = level;
 168 }
 169
 170 static void shpc_set_sec_bus_speed(SHPCDevice *shpc, uint8_t speed)
 171 {
 172     switch (speed) {
 173     case SHPC_SEC_BUS_33:
 174         shpc->config[SHPC_SEC_BUS] &= ~SHPC_SEC_BUS_MASK;
 175         shpc->config[SHPC_SEC_BUS] |= speed;
 176         break;
 177     default:
 178         pci_word_test_and_set_mask(shpc->config + SHPC_CMD_STATUS,
 179                                    SHPC_CMD_STATUS_INVALID_MODE);
 180     }
 181 }
 182
 183 void shpc_reset(PCIDevice *d)
 184 {
 185     SHPCDevice *shpc = d->shpc;
 186     int nslots = shpc->nslots;
 187     int i;
 188     memset(shpc->config, 0, SHPC_SIZEOF(d));
 189     pci_set_byte(shpc->config + SHPC_NSLOTS, nslots);
 190     pci_set_long(shpc->config + SHPC_SLOTS_33, nslots);
 191     pci_set_long(shpc->config + SHPC_SLOTS_66, 0);
 192     pci_set_byte(shpc->config + SHPC_FIRST_DEV, SHPC_IDX_TO_PCI(0));
 193     pci_set_word(shpc->config + SHPC_PHYS_SLOT,
 194                  SHPC_IDX_TO_PHYSICAL(0) |
 195                  SHPC_PHYS_NUM_UP |
 196                  SHPC_PHYS_MRL |
 197                  SHPC_PHYS_BUTTON);
 198     pci_set_long(shpc->config + SHPC_SERR_INT, SHPC_INT_DIS |
 199                  SHPC_SERR_DIS |
 200                  SHPC_CMD_INT_DIS |
 201                  SHPC_ARB_SERR_DIS);
 202     pci_set_byte(shpc->config + SHPC_PROG_IFC, SHPC_PROG_IFC_1_0);
 203     pci_set_word(shpc->config + SHPC_SEC_BUS, SHPC_SEC_BUS_33);
 204     for (i = 0; i < shpc->nslots; ++i) {
 205         pci_set_byte(shpc->config + SHPC_SLOT_EVENT_SERR_INT_DIS(d, i),
 206                      SHPC_SLOT_EVENT_PRESENCE |
 207                      SHPC_SLOT_EVENT_ISOLATED_FAULT |
 208                      SHPC_SLOT_EVENT_BUTTON |
 209                      SHPC_SLOT_EVENT_MRL |
 210                      SHPC_SLOT_EVENT_CONNECTED_FAULT |
 211                      SHPC_SLOT_EVENT_MRL_SERR_DIS |
 212                      SHPC_SLOT_EVENT_CONNECTED_FAULT_SERR_DIS);
 213         if (shpc->sec_bus->devices[PCI_DEVFN(SHPC_IDX_TO_PCI(i), 0)]) {
 214             shpc_set_status(shpc, i, SHPC_STATE_ENABLED, SHPC_SLOT_STATE_MASK);
 215             shpc_set_status(shpc, i, 0, SHPC_SLOT_STATUS_MRL_OPEN);
 216             shpc_set_status(shpc, i, SHPC_SLOT_STATUS_PRSNT_7_5W,
 217                             SHPC_SLOT_STATUS_PRSNT_MASK);
 218             shpc_set_status(shpc, i, SHPC_LED_ON, SHPC_SLOT_PWR_LED_MASK);
 219         } else {
 220             shpc_set_status(shpc, i, SHPC_STATE_DISABLED, SHPC_SLOT_STATE_MASK);
 221             shpc_set_status(shpc, i, 1, SHPC_SLOT_STATUS_MRL_OPEN);
 222             shpc_set_status(shpc, i, SHPC_SLOT_STATUS_PRSNT_EMPTY,
 223                             SHPC_SLOT_STATUS_PRSNT_MASK);
 224             shpc_set_status(shpc, i, SHPC_LED_OFF, SHPC_SLOT_PWR_LED_MASK);
 225         }
 226         shpc_set_status(shpc, i, 0, SHPC_SLOT_STATUS_66);
 227     }
 228     shpc_set_sec_bus_speed(shpc, SHPC_SEC_BUS_33);
 229     shpc->msi_requested = 0;
 230     shpc_interrupt_update(d);
 231 }
 232
 233 static void shpc_invalid_command(SHPCDevice *shpc)
 234 {
 235     pci_word_test_and_set_mask(shpc->config + SHPC_CMD_STATUS,
 236                                SHPC_CMD_STATUS_INVALID_CMD);
 237 }
 238
 239 static void shpc_free_devices_in_slot(SHPCDevice *shpc, int slot)
 240 {
 241     HotplugHandler *hotplug_ctrl;
 242     int devfn;
 243     int pci_slot = SHPC_IDX_TO_PCI(slot);
 244     for (devfn = PCI_DEVFN(pci_slot, 0);
 245          devfn <= PCI_DEVFN(pci_slot, PCI_FUNC_MAX - 1);
 246          ++devfn) {
 247         PCIDevice *affected_dev = shpc->sec_bus->devices[devfn];
 248         if (affected_dev) {
 249             hotplug_ctrl = qdev_get_hotplug_handler(DEVICE(affected_dev));
 250             hotplug_handler_unplug(hotplug_ctrl, DEVICE(affected_dev),
 251                                    &error_abort);
 252             object_unparent(OBJECT(affected_dev));
 253         }
 254     }
 255 }
 256
 257 static void shpc_slot_command(SHPCDevice *shpc, uint8_t target,
 258                               uint8_t state, uint8_t power, uint8_t attn)
 259 {
 260     uint8_t current_state;
 261     int slot = SHPC_LOGICAL_TO_IDX(target);
 262     if (target < SHPC_CMD_TRGT_MIN || slot >= shpc->nslots) {
 263         shpc_invalid_command(shpc);
 264         return;
 265     }
 266     current_state = shpc_get_status(shpc, slot, SHPC_SLOT_STATE_MASK);
 267     if (current_state == SHPC_STATE_ENABLED && state == SHPC_STATE_PWRONLY) {
 268         shpc_invalid_command(shpc);
 269         return;
 270     }
 271
 272     switch (power) {
 273     case SHPC_LED_NO:
 274         break;
 275     default:
 276         /* TODO: send event to monitor */
 277         shpc_set_status(shpc, slot, power, SHPC_SLOT_PWR_LED_MASK);
 278     }
 279     switch (attn) {
 280     case SHPC_LED_NO:
 281         break;
 282     default:
 283         /* TODO: send event to monitor */
 284         shpc_set_status(shpc, slot, attn, SHPC_SLOT_ATTN_LED_MASK);
 285     }
 286
 287     if ((current_state == SHPC_STATE_DISABLED && state == SHPC_STATE_PWRONLY) ||
 288         (current_state == SHPC_STATE_DISABLED && state == SHPC_STATE_ENABLED)) {
 289         shpc_set_status(shpc, slot, state, SHPC_SLOT_STATE_MASK);
 290     } else if ((current_state == SHPC_STATE_ENABLED ||
 291                 current_state == SHPC_STATE_PWRONLY) &&
 292                state == SHPC_STATE_DISABLED) {
 293         shpc_set_status(shpc, slot, state, SHPC_SLOT_STATE_MASK);
 294         power = shpc_get_status(shpc, slot, SHPC_SLOT_PWR_LED_MASK);
 295         /* TODO: track what monitor requested. */
 296         /* Look at LED to figure out whether it's ok to remove the device. */
 297         if (power == SHPC_LED_OFF) {
 298             shpc_free_devices_in_slot(shpc, slot);
 299             shpc_set_status(shpc, slot, 1, SHPC_SLOT_STATUS_MRL_OPEN);
 300             shpc_set_status(shpc, slot, SHPC_SLOT_STATUS_PRSNT_EMPTY,
 301                             SHPC_SLOT_STATUS_PRSNT_MASK);
 302             shpc->config[SHPC_SLOT_EVENT_LATCH(slot)] |=
 303                 SHPC_SLOT_EVENT_BUTTON |
 304                 SHPC_SLOT_EVENT_MRL |
 305                 SHPC_SLOT_EVENT_PRESENCE;
 306         }
 307     }
 308 }
 309
 310 static void shpc_command(SHPCDevice *shpc)
 311 {
 312     uint8_t code = pci_get_byte(shpc->config + SHPC_CMD_CODE);
 313     uint8_t speed;
 314     uint8_t target;
 315     uint8_t attn;
 316     uint8_t power;
 317     uint8_t state;
 318     int i;
 319
 320     /* Clear status from the previous command. */
 321     pci_word_test_and_clear_mask(shpc->config + SHPC_CMD_STATUS,
 322                                  SHPC_CMD_STATUS_BUSY |
 323                                  SHPC_CMD_STATUS_MRL_OPEN |
 324                                  SHPC_CMD_STATUS_INVALID_CMD |
 325                                  SHPC_CMD_STATUS_INVALID_MODE);
 326     switch (code) {
 327     case 0x00 ... 0x3f:
 328         target = shpc->config[SHPC_CMD_TRGT] & SHPC_CMD_TRGT_MAX;
 329         state = (code & SHPC_SLOT_STATE_MASK) >> SHPC_SLOT_STATE_SHIFT;
 330         power = (code & SHPC_SLOT_PWR_LED_MASK) >> SHPC_SLOT_PWR_LED_SHIFT;
 331         attn = (code & SHPC_SLOT_ATTN_LED_MASK) >> SHPC_SLOT_ATTN_LED_SHIFT;
 332         shpc_slot_command(shpc, target, state, power, attn);
 333         break;
 334     case 0x40 ... 0x47:
 335         speed = code & SHPC_SEC_BUS_MASK;
 336         shpc_set_sec_bus_speed(shpc, speed);
 337         break;
 338     case 0x48:
 339         /* Power only all slots */
 340         /* first verify no slots are enabled */
 341         for (i = 0; i < shpc->nslots; ++i) {
 342             state = shpc_get_status(shpc, i, SHPC_SLOT_STATE_MASK);
 343             if (state == SHPC_STATE_ENABLED) {
 344                 shpc_invalid_command(shpc);
 345                 goto done;
 346             }
 347         }
 348         for (i = 0; i < shpc->nslots; ++i) {
 349             if (!(shpc_get_status(shpc, i, SHPC_SLOT_STATUS_MRL_OPEN))) {
 350                 shpc_slot_command(shpc, i + SHPC_CMD_TRGT_MIN,
 351                                   SHPC_STATE_PWRONLY, SHPC_LED_ON, SHPC_LED_NO);
 352             } else {
 353                 shpc_slot_command(shpc, i + SHPC_CMD_TRGT_MIN,
 354                                   SHPC_STATE_NO, SHPC_LED_OFF, SHPC_LED_NO);
 355             }
 356         }
 357         break;
 358     case 0x49:
 359         /* Enable all slots */
 360         /* TODO: Spec says this shall fail if some are already enabled.
 361          * This doesn't make sense - why not? a spec bug? */
 362         for (i = 0; i < shpc->nslots; ++i) {
 363             state = shpc_get_status(shpc, i, SHPC_SLOT_STATE_MASK);
 364             if (state == SHPC_STATE_ENABLED) {
 365                 shpc_invalid_command(shpc);
 366                 goto done;
 367             }
 368         }
 369         for (i = 0; i < shpc->nslots; ++i) {
 370             if (!(shpc_get_status(shpc, i, SHPC_SLOT_STATUS_MRL_OPEN))) {
 371                 shpc_slot_command(shpc, i + SHPC_CMD_TRGT_MIN,
 372                                   SHPC_STATE_ENABLED, SHPC_LED_ON, SHPC_LED_NO);
 373             } else {
 374                 shpc_slot_command(shpc, i + SHPC_CMD_TRGT_MIN,
 375                                   SHPC_STATE_NO, SHPC_LED_OFF, SHPC_LED_NO);
 376             }
 377         }
 378         break;
 379     default:
 380         shpc_invalid_command(shpc);
 381         break;
 382     }
 383 done:
 384     pci_long_test_and_set_mask(shpc->config + SHPC_SERR_INT, SHPC_CMD_DETECTED);
 385 }
 386
 387 static void shpc_write(PCIDevice *d, unsigned addr, uint64_t val, int l)
 388 {
 389     SHPCDevice *shpc = d->shpc;
 390     int i;
 391     if (addr >= SHPC_SIZEOF(d)) {
 392         return;
 393     }
 394     l = MIN(l, SHPC_SIZEOF(d) - addr);
 395
 396     /* TODO: code duplicated from pci.c */
 397     for (i = 0; i < l; val >>= 8, ++i) {
 398         unsigned a = addr + i;
 399         uint8_t wmask = shpc->wmask[a];
 400         uint8_t w1cmask = shpc->w1cmask[a];
 401         assert(!(wmask & w1cmask));
 402         shpc->config[a] = (shpc->config[a] & ~wmask) | (val & wmask);
 403         shpc->config[a] &= ~(val & w1cmask); /* W1C: Write 1 to Clear */
 404     }
 405     if (ranges_overlap(addr, l, SHPC_CMD_CODE, 2)) {
 406         shpc_command(shpc);
 407     }
 408     shpc_interrupt_update(d);
 409 }
 410
 411 static uint64_t shpc_read(PCIDevice *d, unsigned addr, int l)
 412 {
 413     uint64_t val = 0x0;
 414     if (addr >= SHPC_SIZEOF(d)) {
 415         return val;
 416     }
 417     l = MIN(l, SHPC_SIZEOF(d) - addr);
 418     memcpy(&val, d->shpc->config + addr, l);
 419     return val;
 420 }
 421
 422 /* SHPC Bridge Capability */
 423 #define SHPC_CAP_LENGTH 0x08
 424 #define SHPC_CAP_DWORD_SELECT 0x2 /* 1 byte */
 425 #define SHPC_CAP_CxP 0x3 /* 1 byte: CSP, CIP */
 426 #define SHPC_CAP_DWORD_DATA 0x4 /* 4 bytes */
 427 #define SHPC_CAP_CSP_MASK 0x4
 428 #define SHPC_CAP_CIP_MASK 0x8
 429
 430 static uint8_t shpc_cap_dword(PCIDevice *d)
 431 {
 432     return pci_get_byte(d->config + d->shpc->cap + SHPC_CAP_DWORD_SELECT);
 433 }
 434
 435 /* Update dword data capability register */
 436 static void shpc_cap_update_dword(PCIDevice *d)
 437 {
 438     unsigned data;
 439     data = shpc_read(d, shpc_cap_dword(d) * 4, 4);
 440     pci_set_long(d->config  + d->shpc->cap + SHPC_CAP_DWORD_DATA, data);
 441 }
 442
 443 /* Add SHPC capability to the config space for the device. */
 444 static int shpc_cap_add_config(PCIDevice *d, Error **errp)
 445 {
 446     uint8_t *config;
 447     int config_offset;
 448     config_offset = pci_add_capability(d, PCI_CAP_ID_SHPC,
 449                                        0, SHPC_CAP_LENGTH,
 450                                        errp);
 451     if (config_offset < 0) {
 452         return config_offset;
 453     }
 454     config = d->config + config_offset;
 455
 456     pci_set_byte(config + SHPC_CAP_DWORD_SELECT, 0);
 457     pci_set_byte(config + SHPC_CAP_CxP, 0);
 458     pci_set_long(config + SHPC_CAP_DWORD_DATA, 0);
 459     d->shpc->cap = config_offset;
 460     /* Make dword select and data writeable. */
 461     pci_set_byte(d->wmask + config_offset + SHPC_CAP_DWORD_SELECT, 0xff);
 462     pci_set_long(d->wmask + config_offset + SHPC_CAP_DWORD_DATA, 0xffffffff);
 463     return 0;
 464 }
 465
 466 static uint64_t shpc_mmio_read(void *opaque, hwaddr addr,
 467                                unsigned size)
 468 {
 469     return shpc_read(opaque, addr, size);
 470 }
 471
 472 static void shpc_mmio_write(void *opaque, hwaddr addr,
 473                             uint64_t val, unsigned size)
 474 {
 475     shpc_write(opaque, addr, val, size);
 476 }
 477
 478 static const MemoryRegionOps shpc_mmio_ops = {
 479     .read = shpc_mmio_read,
 480     .write = shpc_mmio_write,
 481     .endianness = DEVICE_LITTLE_ENDIAN,
 482     .valid = {
 483         /* SHPC ECN requires dword accesses, but the original 1.0 spec doesn't.
 484          * It's easier to suppport all sizes than worry about it. */
 485         .min_access_size = 1,
 486         .max_access_size = 4,
 487     },
 488 };
 489 static void shpc_device_plug_common(PCIDevice *affected_dev, int *slot,
 490                                     SHPCDevice *shpc, Error **errp)
 491 {
 492     int pci_slot = PCI_SLOT(affected_dev->devfn);
 493     *slot = SHPC_PCI_TO_IDX(pci_slot);
 494
 495     if (pci_slot < SHPC_IDX_TO_PCI(0) || *slot >= shpc->nslots) {
 496         error_setg(errp, "Unsupported PCI slot %d for standard hotplug "
 497                    "controller. Valid slots are between %d and %d.",
 498                    pci_slot, SHPC_IDX_TO_PCI(0),
 499                    SHPC_IDX_TO_PCI(shpc->nslots) - 1);
 500         return;
 501     }
 502 }
 503
 504 void shpc_device_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
 505                             Error **errp)
 506 {
 507     Error *local_err = NULL;
 508     PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
 509     SHPCDevice *shpc = pci_hotplug_dev->shpc;
 510     int slot;
 511
 512     shpc_device_plug_common(PCI_DEVICE(dev), &slot, shpc, &local_err);
 513     if (local_err) {
 514         error_propagate(errp, local_err);
 515         return;
 516     }
 517
 518     /* Don't send event when device is enabled during qemu machine creation:
 519      * it is present on boot, no hotplug event is necessary. We do send an
 520      * event when the device is disabled later. */
 521     if (!dev->hotplugged) {
 522         shpc_set_status(shpc, slot, 0, SHPC_SLOT_STATUS_MRL_OPEN);
 523         shpc_set_status(shpc, slot, SHPC_SLOT_STATUS_PRSNT_7_5W,
 524                         SHPC_SLOT_STATUS_PRSNT_MASK);
 525         return;
 526     }
 527
 528     /* This could be a cancellation of the previous removal.
 529      * We check MRL state to figure out. */
 530     if (shpc_get_status(shpc, slot, SHPC_SLOT_STATUS_MRL_OPEN)) {
 531         shpc_set_status(shpc, slot, 0, SHPC_SLOT_STATUS_MRL_OPEN);
 532         shpc_set_status(shpc, slot, SHPC_SLOT_STATUS_PRSNT_7_5W,
 533                         SHPC_SLOT_STATUS_PRSNT_MASK);
 534         shpc->config[SHPC_SLOT_EVENT_LATCH(slot)] |=
 535             SHPC_SLOT_EVENT_BUTTON |
 536             SHPC_SLOT_EVENT_MRL |
 537             SHPC_SLOT_EVENT_PRESENCE;
 538     } else {
 539         /* Press attention button to cancel removal */
 540         shpc->config[SHPC_SLOT_EVENT_LATCH(slot)] |=
 541             SHPC_SLOT_EVENT_BUTTON;
 542     }
 543     shpc_set_status(shpc, slot, 0, SHPC_SLOT_STATUS_66);
 544     shpc_interrupt_update(pci_hotplug_dev);
 545 }
 546
 547 void shpc_device_unplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
 548                            Error **errp)
 549 {
 550     qdev_unrealize(dev);
 551 }
 552
 553 void shpc_device_unplug_request_cb(HotplugHandler *hotplug_dev,
 554                                    DeviceState *dev, Error **errp)
 555 {
 556     Error *local_err = NULL;
 557     PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
 558     SHPCDevice *shpc = pci_hotplug_dev->shpc;
 559     uint8_t state;
 560     uint8_t led;
 561     int slot;
 562
 563     shpc_device_plug_common(PCI_DEVICE(dev), &slot, shpc, &local_err);
 564     if (local_err) {
 565         error_propagate(errp, local_err);
 566         return;
 567     }
 568
 569     shpc->config[SHPC_SLOT_EVENT_LATCH(slot)] |= SHPC_SLOT_EVENT_BUTTON;
 570     state = shpc_get_status(shpc, slot, SHPC_SLOT_STATE_MASK);
 571     led = shpc_get_status(shpc, slot, SHPC_SLOT_PWR_LED_MASK);
 572     if (state == SHPC_STATE_DISABLED && led == SHPC_LED_OFF) {
 573         shpc_free_devices_in_slot(shpc, slot);
 574         shpc_set_status(shpc, slot, 1, SHPC_SLOT_STATUS_MRL_OPEN);
 575         shpc_set_status(shpc, slot, SHPC_SLOT_STATUS_PRSNT_EMPTY,
 576                         SHPC_SLOT_STATUS_PRSNT_MASK);
 577         shpc->config[SHPC_SLOT_EVENT_LATCH(slot)] |=
 578             SHPC_SLOT_EVENT_MRL |
 579             SHPC_SLOT_EVENT_PRESENCE;
 580     }
 581     shpc_set_status(shpc, slot, 0, SHPC_SLOT_STATUS_66);
 582     shpc_interrupt_update(pci_hotplug_dev);
 583 }
 584
 585 /* Initialize the SHPC structure in bridge's BAR. */
 586 int shpc_init(PCIDevice *d, PCIBus *sec_bus, MemoryRegion *bar,
 587               unsigned offset, Error **errp)
 588 {
 589     int i, ret;
 590     int nslots = SHPC_MAX_SLOTS; /* TODO: qdev property? */
 591     SHPCDevice *shpc = d->shpc = g_malloc0(sizeof(*d->shpc));
 592     shpc->sec_bus = sec_bus;
 593     ret = shpc_cap_add_config(d, errp);
 594     if (ret) {
 595         g_free(d->shpc);
 596         return ret;
 597     }
 598     if (nslots < SHPC_MIN_SLOTS) {
 599         return 0;
 600     }
 601     if (nslots > SHPC_MAX_SLOTS ||
 602         SHPC_IDX_TO_PCI(nslots) > PCI_SLOT_MAX) {
 603         /* TODO: report an error mesage that makes sense. */
 604         return -EINVAL;
 605     }
 606     shpc->nslots = nslots;
 607     shpc->config = g_malloc0(SHPC_SIZEOF(d));
 608     shpc->cmask = g_malloc0(SHPC_SIZEOF(d));
 609     shpc->wmask = g_malloc0(SHPC_SIZEOF(d));
 610     shpc->w1cmask = g_malloc0(SHPC_SIZEOF(d));
 611
 612     shpc_reset(d);
 613
 614     pci_set_long(shpc->config + SHPC_BASE_OFFSET, offset);
 615
 616     pci_set_byte(shpc->wmask + SHPC_CMD_CODE, 0xff);
 617     pci_set_byte(shpc->wmask + SHPC_CMD_TRGT, SHPC_CMD_TRGT_MAX);
 618     pci_set_byte(shpc->wmask + SHPC_CMD_TRGT, SHPC_CMD_TRGT_MAX);
 619     pci_set_long(shpc->wmask + SHPC_SERR_INT,
 620                  SHPC_INT_DIS |
 621                  SHPC_SERR_DIS |
 622                  SHPC_CMD_INT_DIS |
 623                  SHPC_ARB_SERR_DIS);
 624     pci_set_long(shpc->w1cmask + SHPC_SERR_INT,
 625                  SHPC_CMD_DETECTED |
 626                  SHPC_ARB_DETECTED);
 627     for (i = 0; i < nslots; ++i) {
 628         pci_set_byte(shpc->wmask +
 629                      SHPC_SLOT_EVENT_SERR_INT_DIS(d, i),
 630                      SHPC_SLOT_EVENT_PRESENCE |
 631                      SHPC_SLOT_EVENT_ISOLATED_FAULT |
 632                      SHPC_SLOT_EVENT_BUTTON |
 633                      SHPC_SLOT_EVENT_MRL |
 634                      SHPC_SLOT_EVENT_CONNECTED_FAULT |
 635                      SHPC_SLOT_EVENT_MRL_SERR_DIS |
 636                      SHPC_SLOT_EVENT_CONNECTED_FAULT_SERR_DIS);
 637         pci_set_byte(shpc->w1cmask +
 638                      SHPC_SLOT_EVENT_LATCH(i),
 639                      SHPC_SLOT_EVENT_PRESENCE |
 640                      SHPC_SLOT_EVENT_ISOLATED_FAULT |
 641                      SHPC_SLOT_EVENT_BUTTON |
 642                      SHPC_SLOT_EVENT_MRL |
 643                      SHPC_SLOT_EVENT_CONNECTED_FAULT);
 644     }
 645
 646     /* TODO: init cmask */
 647     memory_region_init_io(&shpc->mmio, OBJECT(d), &shpc_mmio_ops,
 648                           d, "shpc-mmio", SHPC_SIZEOF(d));
 649     shpc_cap_update_dword(d);
 650     memory_region_add_subregion(bar, offset, &shpc->mmio);
 651
 652     qbus_set_hotplug_handler(BUS(sec_bus), OBJECT(d));
 653
 654     d->cap_present |= QEMU_PCI_CAP_SHPC;
 655     return 0;
 656 }
 657
 658 int shpc_bar_size(PCIDevice *d)
 659 {
 660     return pow2roundup32(SHPC_SLOT_REG(SHPC_MAX_SLOTS));
 661 }
 662
 663 void shpc_cleanup(PCIDevice *d, MemoryRegion *bar)
 664 {
 665     SHPCDevice *shpc = d->shpc;
 666     d->cap_present &= ~QEMU_PCI_CAP_SHPC;
 667     memory_region_del_subregion(bar, &shpc->mmio);
 668     /* TODO: cleanup config space changes? */
 669 }
 670
 671 void shpc_free(PCIDevice *d)
 672 {
 673     SHPCDevice *shpc = d->shpc;
 674     if (!shpc) {
 675         return;
 676     }
 677     object_unparent(OBJECT(&shpc->mmio));
 678     g_free(shpc->config);
 679     g_free(shpc->cmask);
 680     g_free(shpc->wmask);
 681     g_free(shpc->w1cmask);
 682     g_free(shpc);
 683     d->shpc = NULL;
 684 }
 685
 686 void shpc_cap_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int l)
 687 {
 688     if (!ranges_overlap(addr, l, d->shpc->cap, SHPC_CAP_LENGTH)) {
 689         return;
 690     }
 691     if (ranges_overlap(addr, l, d->shpc->cap + SHPC_CAP_DWORD_DATA, 4)) {
 692         unsigned dword_data;
 693         dword_data = pci_get_long(d->shpc->config + d->shpc->cap
 694                                   + SHPC_CAP_DWORD_DATA);
 695         shpc_write(d, shpc_cap_dword(d) * 4, dword_data, 4);
 696     }
 697     /* Update cap dword data in case guest is going to read it. */
 698     shpc_cap_update_dword(d);
 699 }
 700
 701 static int shpc_save(QEMUFile *f, void *pv, size_t size,
 702                      const VMStateField *field, QJSON *vmdesc)
 703 {
 704     PCIDevice *d = container_of(pv, PCIDevice, shpc);
 705     qemu_put_buffer(f, d->shpc->config, SHPC_SIZEOF(d));
 706
 707     return 0;
 708 }
 709
 710 static int shpc_load(QEMUFile *f, void *pv, size_t size,
 711                      const VMStateField *field)
 712 {
 713     PCIDevice *d = container_of(pv, PCIDevice, shpc);
 714     int ret = qemu_get_buffer(f, d->shpc->config, SHPC_SIZEOF(d));
 715     if (ret != SHPC_SIZEOF(d)) {
 716         return -EINVAL;
 717     }
 718     /* Make sure we don't lose notifications. An extra interrupt is harmless. */
 719     d->shpc->msi_requested = 0;
 720     shpc_interrupt_update(d);
 721     return 0;
 722 }
 723
 724 VMStateInfo shpc_vmstate_info = {
 725     .name = "shpc",
 726     .get  = shpc_load,
 727     .put  = shpc_save,
 728 };