diff options
Diffstat (limited to 'src/hw/pci/shpc.c')
| -rw-r--r-- | src/hw/pci/shpc.c | 720 |
1 files changed, 720 insertions, 0 deletions
diff --git a/src/hw/pci/shpc.c b/src/hw/pci/shpc.c new file mode 100644 index 0000000..d34fdf3 --- /dev/null +++ b/src/hw/pci/shpc.c @@ -0,0 +1,720 @@ +#include "qemu-common.h" +#include <stdint.h> +#include "qemu/range.h" +#include "qemu/error-report.h" +#include "hw/pci/shpc.h" +#include "hw/pci/pci.h" +#include "hw/pci/pci_bus.h" +#include "hw/pci/msi.h" + +/* TODO: model power only and disabled slot states. */ +/* TODO: handle SERR and wakeups */ +/* TODO: consider enabling 66MHz support */ + +/* TODO: remove fully only on state DISABLED and LED off. + * track state to properly record this. */ + +/* SHPC Working Register Set */ +#define SHPC_BASE_OFFSET 0x00 /* 4 bytes */ +#define SHPC_SLOTS_33 0x04 /* 4 bytes. Also encodes PCI-X slots. */ +#define SHPC_SLOTS_66 0x08 /* 4 bytes. */ +#define SHPC_NSLOTS 0x0C /* 1 byte */ +#define SHPC_FIRST_DEV 0x0D /* 1 byte */ +#define SHPC_PHYS_SLOT 0x0E /* 2 byte */ +#define SHPC_PHYS_NUM_MAX 0x7ff +#define SHPC_PHYS_NUM_UP 0x2000 +#define SHPC_PHYS_MRL 0x4000 +#define SHPC_PHYS_BUTTON 0x8000 +#define SHPC_SEC_BUS 0x10 /* 2 bytes */ +#define SHPC_SEC_BUS_33 0x0 +#define SHPC_SEC_BUS_66 0x1 /* Unused */ +#define SHPC_SEC_BUS_MASK 0x7 +#define SHPC_MSI_CTL 0x12 /* 1 byte */ +#define SHPC_PROG_IFC 0x13 /* 1 byte */ +#define SHPC_PROG_IFC_1_0 0x1 +#define SHPC_CMD_CODE 0x14 /* 1 byte */ +#define SHPC_CMD_TRGT 0x15 /* 1 byte */ +#define SHPC_CMD_TRGT_MIN 0x1 +#define SHPC_CMD_TRGT_MAX 0x1f +#define SHPC_CMD_STATUS 0x16 /* 2 bytes */ +#define SHPC_CMD_STATUS_BUSY 0x1 +#define SHPC_CMD_STATUS_MRL_OPEN 0x2 +#define SHPC_CMD_STATUS_INVALID_CMD 0x4 +#define SHPC_CMD_STATUS_INVALID_MODE 0x8 +#define SHPC_INT_LOCATOR 0x18 /* 4 bytes */ +#define SHPC_INT_COMMAND 0x1 +#define SHPC_SERR_LOCATOR 0x1C /* 4 bytes */ +#define SHPC_SERR_INT 0x20 /* 4 bytes */ +#define SHPC_INT_DIS 0x1 +#define SHPC_SERR_DIS 0x2 +#define SHPC_CMD_INT_DIS 0x4 +#define SHPC_ARB_SERR_DIS 0x8 +#define SHPC_CMD_DETECTED 0x10000 +#define SHPC_ARB_DETECTED 0x20000 + /* 4 bytes * slot # (start from 0) */ +#define SHPC_SLOT_REG(s) (0x24 + (s) * 4) + /* 2 bytes */ +#define SHPC_SLOT_STATUS(s) (0x0 + SHPC_SLOT_REG(s)) + +/* Same slot state masks are used for command and status registers */ +#define SHPC_SLOT_STATE_MASK 0x03 +#define SHPC_SLOT_STATE_SHIFT \ + ctz32(SHPC_SLOT_STATE_MASK) + +#define SHPC_STATE_NO 0x0 +#define SHPC_STATE_PWRONLY 0x1 +#define SHPC_STATE_ENABLED 0x2 +#define SHPC_STATE_DISABLED 0x3 + +#define SHPC_SLOT_PWR_LED_MASK 0xC +#define SHPC_SLOT_PWR_LED_SHIFT \ + ctz32(SHPC_SLOT_PWR_LED_MASK) +#define SHPC_SLOT_ATTN_LED_MASK 0x30 +#define SHPC_SLOT_ATTN_LED_SHIFT \ + ctz32(SHPC_SLOT_ATTN_LED_MASK) + +#define SHPC_LED_NO 0x0 +#define SHPC_LED_ON 0x1 +#define SHPC_LED_BLINK 0x2 +#define SHPC_LED_OFF 0x3 + +#define SHPC_SLOT_STATUS_PWR_FAULT 0x40 +#define SHPC_SLOT_STATUS_BUTTON 0x80 +#define SHPC_SLOT_STATUS_MRL_OPEN 0x100 +#define SHPC_SLOT_STATUS_66 0x200 +#define SHPC_SLOT_STATUS_PRSNT_MASK 0xC00 +#define SHPC_SLOT_STATUS_PRSNT_EMPTY 0x3 +#define SHPC_SLOT_STATUS_PRSNT_25W 0x1 +#define SHPC_SLOT_STATUS_PRSNT_15W 0x2 +#define SHPC_SLOT_STATUS_PRSNT_7_5W 0x0 + +#define SHPC_SLOT_STATUS_PRSNT_PCIX 0x3000 + + + /* 1 byte */ +#define SHPC_SLOT_EVENT_LATCH(s) (0x2 + SHPC_SLOT_REG(s)) + /* 1 byte */ +#define SHPC_SLOT_EVENT_SERR_INT_DIS(d, s) (0x3 + SHPC_SLOT_REG(s)) +#define SHPC_SLOT_EVENT_PRESENCE 0x01 +#define SHPC_SLOT_EVENT_ISOLATED_FAULT 0x02 +#define SHPC_SLOT_EVENT_BUTTON 0x04 +#define SHPC_SLOT_EVENT_MRL 0x08 +#define SHPC_SLOT_EVENT_CONNECTED_FAULT 0x10 +/* Bits below are used for Serr/Int disable only */ +#define SHPC_SLOT_EVENT_MRL_SERR_DIS 0x20 +#define SHPC_SLOT_EVENT_CONNECTED_FAULT_SERR_DIS 0x40 + +#define SHPC_MIN_SLOTS 1 +#define SHPC_MAX_SLOTS 31 +#define SHPC_SIZEOF(d) SHPC_SLOT_REG((d)->shpc->nslots) + +/* SHPC Slot identifiers */ + +/* Hotplug supported at 31 slots out of the total 32. We reserve slot 0, + and give the rest of them physical *and* pci numbers starting from 1, so + they match logical numbers. Note: this means that multiple slots must have + different chassis number values, to make chassis+physical slot unique. + TODO: make this configurable? */ +#define SHPC_IDX_TO_LOGICAL(slot) ((slot) + 1) +#define SHPC_LOGICAL_TO_IDX(target) ((target) - 1) +#define SHPC_IDX_TO_PCI(slot) ((slot) + 1) +#define SHPC_PCI_TO_IDX(pci_slot) ((pci_slot) - 1) +#define SHPC_IDX_TO_PHYSICAL(slot) ((slot) + 1) + +static int roundup_pow_of_two(int x) +{ + x |= (x >> 1); + x |= (x >> 2); + x |= (x >> 4); + x |= (x >> 8); + x |= (x >> 16); + return x + 1; +} + +static uint16_t shpc_get_status(SHPCDevice *shpc, int slot, uint16_t msk) +{ + uint8_t *status = shpc->config + SHPC_SLOT_STATUS(slot); + return (pci_get_word(status) & msk) >> ctz32(msk); +} + +static void shpc_set_status(SHPCDevice *shpc, + int slot, uint8_t value, uint16_t msk) +{ + uint8_t *status = shpc->config + SHPC_SLOT_STATUS(slot); + pci_word_test_and_clear_mask(status, msk); + pci_word_test_and_set_mask(status, value << ctz32(msk)); +} + +static void shpc_interrupt_update(PCIDevice *d) +{ + SHPCDevice *shpc = d->shpc; + int slot; + int level = 0; + uint32_t serr_int; + uint32_t int_locator = 0; + + /* Update interrupt locator register */ + for (slot = 0; slot < shpc->nslots; ++slot) { + uint8_t event = shpc->config[SHPC_SLOT_EVENT_LATCH(slot)]; + uint8_t disable = shpc->config[SHPC_SLOT_EVENT_SERR_INT_DIS(d, slot)]; + uint32_t mask = 1U << SHPC_IDX_TO_LOGICAL(slot); + if (event & ~disable) { + int_locator |= mask; + } + } + serr_int = pci_get_long(shpc->config + SHPC_SERR_INT); + if ((serr_int & SHPC_CMD_DETECTED) && !(serr_int & SHPC_CMD_INT_DIS)) { + int_locator |= SHPC_INT_COMMAND; + } + pci_set_long(shpc->config + SHPC_INT_LOCATOR, int_locator); + level = (!(serr_int & SHPC_INT_DIS) && int_locator) ? 1 : 0; + if (msi_enabled(d) && shpc->msi_requested != level) + msi_notify(d, 0); + else + pci_set_irq(d, level); + shpc->msi_requested = level; +} + +static void shpc_set_sec_bus_speed(SHPCDevice *shpc, uint8_t speed) +{ + switch (speed) { + case SHPC_SEC_BUS_33: + shpc->config[SHPC_SEC_BUS] &= ~SHPC_SEC_BUS_MASK; + shpc->config[SHPC_SEC_BUS] |= speed; + break; + default: + pci_word_test_and_set_mask(shpc->config + SHPC_CMD_STATUS, + SHPC_CMD_STATUS_INVALID_MODE); + } +} + +void shpc_reset(PCIDevice *d) +{ + SHPCDevice *shpc = d->shpc; + int nslots = shpc->nslots; + int i; + memset(shpc->config, 0, SHPC_SIZEOF(d)); + pci_set_byte(shpc->config + SHPC_NSLOTS, nslots); + pci_set_long(shpc->config + SHPC_SLOTS_33, nslots); + pci_set_long(shpc->config + SHPC_SLOTS_66, 0); + pci_set_byte(shpc->config + SHPC_FIRST_DEV, SHPC_IDX_TO_PCI(0)); + pci_set_word(shpc->config + SHPC_PHYS_SLOT, + SHPC_IDX_TO_PHYSICAL(0) | + SHPC_PHYS_NUM_UP | + SHPC_PHYS_MRL | + SHPC_PHYS_BUTTON); + pci_set_long(shpc->config + SHPC_SERR_INT, SHPC_INT_DIS | + SHPC_SERR_DIS | + SHPC_CMD_INT_DIS | + SHPC_ARB_SERR_DIS); + pci_set_byte(shpc->config + SHPC_PROG_IFC, SHPC_PROG_IFC_1_0); + pci_set_word(shpc->config + SHPC_SEC_BUS, SHPC_SEC_BUS_33); + for (i = 0; i < shpc->nslots; ++i) { + pci_set_byte(shpc->config + SHPC_SLOT_EVENT_SERR_INT_DIS(d, i), + SHPC_SLOT_EVENT_PRESENCE | + SHPC_SLOT_EVENT_ISOLATED_FAULT | + SHPC_SLOT_EVENT_BUTTON | + SHPC_SLOT_EVENT_MRL | + SHPC_SLOT_EVENT_CONNECTED_FAULT | + SHPC_SLOT_EVENT_MRL_SERR_DIS | + SHPC_SLOT_EVENT_CONNECTED_FAULT_SERR_DIS); + if (shpc->sec_bus->devices[PCI_DEVFN(SHPC_IDX_TO_PCI(i), 0)]) { + shpc_set_status(shpc, i, SHPC_STATE_ENABLED, SHPC_SLOT_STATE_MASK); + shpc_set_status(shpc, i, 0, SHPC_SLOT_STATUS_MRL_OPEN); + shpc_set_status(shpc, i, SHPC_SLOT_STATUS_PRSNT_7_5W, + SHPC_SLOT_STATUS_PRSNT_MASK); + shpc_set_status(shpc, i, SHPC_LED_ON, SHPC_SLOT_PWR_LED_MASK); + } else { + shpc_set_status(shpc, i, SHPC_STATE_DISABLED, SHPC_SLOT_STATE_MASK); + shpc_set_status(shpc, i, 1, SHPC_SLOT_STATUS_MRL_OPEN); + shpc_set_status(shpc, i, SHPC_SLOT_STATUS_PRSNT_EMPTY, + SHPC_SLOT_STATUS_PRSNT_MASK); + shpc_set_status(shpc, i, SHPC_LED_OFF, SHPC_SLOT_PWR_LED_MASK); + } + shpc_set_status(shpc, i, 0, SHPC_SLOT_STATUS_66); + } + shpc_set_sec_bus_speed(shpc, SHPC_SEC_BUS_33); + shpc->msi_requested = 0; + shpc_interrupt_update(d); +} + +static void shpc_invalid_command(SHPCDevice *shpc) +{ + pci_word_test_and_set_mask(shpc->config + SHPC_CMD_STATUS, + SHPC_CMD_STATUS_INVALID_CMD); +} + +static void shpc_free_devices_in_slot(SHPCDevice *shpc, int slot) +{ + int devfn; + int pci_slot = SHPC_IDX_TO_PCI(slot); + for (devfn = PCI_DEVFN(pci_slot, 0); + devfn <= PCI_DEVFN(pci_slot, PCI_FUNC_MAX - 1); + ++devfn) { + PCIDevice *affected_dev = shpc->sec_bus->devices[devfn]; + if (affected_dev) { + object_unparent(OBJECT(affected_dev)); + } + } +} + +static void shpc_slot_command(SHPCDevice *shpc, uint8_t target, + uint8_t state, uint8_t power, uint8_t attn) +{ + uint8_t current_state; + int slot = SHPC_LOGICAL_TO_IDX(target); + if (target < SHPC_CMD_TRGT_MIN || slot >= shpc->nslots) { + shpc_invalid_command(shpc); + return; + } + current_state = shpc_get_status(shpc, slot, SHPC_SLOT_STATE_MASK); + if (current_state == SHPC_STATE_ENABLED && state == SHPC_STATE_PWRONLY) { + shpc_invalid_command(shpc); + return; + } + + switch (power) { + case SHPC_LED_NO: + break; + default: + /* TODO: send event to monitor */ + shpc_set_status(shpc, slot, power, SHPC_SLOT_PWR_LED_MASK); + } + switch (attn) { + case SHPC_LED_NO: + break; + default: + /* TODO: send event to monitor */ + shpc_set_status(shpc, slot, attn, SHPC_SLOT_ATTN_LED_MASK); + } + + if ((current_state == SHPC_STATE_DISABLED && state == SHPC_STATE_PWRONLY) || + (current_state == SHPC_STATE_DISABLED && state == SHPC_STATE_ENABLED)) { + shpc_set_status(shpc, slot, state, SHPC_SLOT_STATE_MASK); + } else if ((current_state == SHPC_STATE_ENABLED || + current_state == SHPC_STATE_PWRONLY) && + state == SHPC_STATE_DISABLED) { + shpc_set_status(shpc, slot, state, SHPC_SLOT_STATE_MASK); + power = shpc_get_status(shpc, slot, SHPC_SLOT_PWR_LED_MASK); + /* TODO: track what monitor requested. */ + /* Look at LED to figure out whether it's ok to remove the device. */ + if (power == SHPC_LED_OFF) { + shpc_free_devices_in_slot(shpc, slot); + shpc_set_status(shpc, slot, 1, SHPC_SLOT_STATUS_MRL_OPEN); + shpc_set_status(shpc, slot, SHPC_SLOT_STATUS_PRSNT_EMPTY, + SHPC_SLOT_STATUS_PRSNT_MASK); + shpc->config[SHPC_SLOT_EVENT_LATCH(slot)] |= + SHPC_SLOT_EVENT_BUTTON | + SHPC_SLOT_EVENT_MRL | + SHPC_SLOT_EVENT_PRESENCE; + } + } +} + +static void shpc_command(SHPCDevice *shpc) +{ + uint8_t code = pci_get_byte(shpc->config + SHPC_CMD_CODE); + uint8_t speed; + uint8_t target; + uint8_t attn; + uint8_t power; + uint8_t state; + int i; + + /* Clear status from the previous command. */ + pci_word_test_and_clear_mask(shpc->config + SHPC_CMD_STATUS, + SHPC_CMD_STATUS_BUSY | + SHPC_CMD_STATUS_MRL_OPEN | + SHPC_CMD_STATUS_INVALID_CMD | + SHPC_CMD_STATUS_INVALID_MODE); + switch (code) { + case 0x00 ... 0x3f: + target = shpc->config[SHPC_CMD_TRGT] & SHPC_CMD_TRGT_MAX; + state = (code & SHPC_SLOT_STATE_MASK) >> SHPC_SLOT_STATE_SHIFT; + power = (code & SHPC_SLOT_PWR_LED_MASK) >> SHPC_SLOT_PWR_LED_SHIFT; + attn = (code & SHPC_SLOT_ATTN_LED_MASK) >> SHPC_SLOT_ATTN_LED_SHIFT; + shpc_slot_command(shpc, target, state, power, attn); + break; + case 0x40 ... 0x47: + speed = code & SHPC_SEC_BUS_MASK; + shpc_set_sec_bus_speed(shpc, speed); + break; + case 0x48: + /* Power only all slots */ + /* first verify no slots are enabled */ + for (i = 0; i < shpc->nslots; ++i) { + state = shpc_get_status(shpc, i, SHPC_SLOT_STATE_MASK); + if (state == SHPC_STATE_ENABLED) { + shpc_invalid_command(shpc); + goto done; + } + } + for (i = 0; i < shpc->nslots; ++i) { + if (!(shpc_get_status(shpc, i, SHPC_SLOT_STATUS_MRL_OPEN))) { + shpc_slot_command(shpc, i + SHPC_CMD_TRGT_MIN, + SHPC_STATE_PWRONLY, SHPC_LED_ON, SHPC_LED_NO); + } else { + shpc_slot_command(shpc, i + SHPC_CMD_TRGT_MIN, + SHPC_STATE_NO, SHPC_LED_OFF, SHPC_LED_NO); + } + } + break; + case 0x49: + /* Enable all slots */ + /* TODO: Spec says this shall fail if some are already enabled. + * This doesn't make sense - why not? a spec bug? */ + for (i = 0; i < shpc->nslots; ++i) { + state = shpc_get_status(shpc, i, SHPC_SLOT_STATE_MASK); + if (state == SHPC_STATE_ENABLED) { + shpc_invalid_command(shpc); + goto done; + } + } + for (i = 0; i < shpc->nslots; ++i) { + if (!(shpc_get_status(shpc, i, SHPC_SLOT_STATUS_MRL_OPEN))) { + shpc_slot_command(shpc, i + SHPC_CMD_TRGT_MIN, + SHPC_STATE_ENABLED, SHPC_LED_ON, SHPC_LED_NO); + } else { + shpc_slot_command(shpc, i + SHPC_CMD_TRGT_MIN, + SHPC_STATE_NO, SHPC_LED_OFF, SHPC_LED_NO); + } + } + break; + default: + shpc_invalid_command(shpc); + break; + } +done: + pci_long_test_and_set_mask(shpc->config + SHPC_SERR_INT, SHPC_CMD_DETECTED); +} + +static void shpc_write(PCIDevice *d, unsigned addr, uint64_t val, int l) +{ + SHPCDevice *shpc = d->shpc; + int i; + if (addr >= SHPC_SIZEOF(d)) { + return; + } + l = MIN(l, SHPC_SIZEOF(d) - addr); + + /* TODO: code duplicated from pci.c */ + for (i = 0; i < l; val >>= 8, ++i) { + unsigned a = addr + i; + uint8_t wmask = shpc->wmask[a]; + uint8_t w1cmask = shpc->w1cmask[a]; + assert(!(wmask & w1cmask)); + shpc->config[a] = (shpc->config[a] & ~wmask) | (val & wmask); + shpc->config[a] &= ~(val & w1cmask); /* W1C: Write 1 to Clear */ + } + if (ranges_overlap(addr, l, SHPC_CMD_CODE, 2)) { + shpc_command(shpc); + } + shpc_interrupt_update(d); +} + +static uint64_t shpc_read(PCIDevice *d, unsigned addr, int l) +{ + uint64_t val = 0x0; + if (addr >= SHPC_SIZEOF(d)) { + return val; + } + l = MIN(l, SHPC_SIZEOF(d) - addr); + memcpy(&val, d->shpc->config + addr, l); + return val; +} + +/* SHPC Bridge Capability */ +#define SHPC_CAP_LENGTH 0x08 +#define SHPC_CAP_DWORD_SELECT 0x2 /* 1 byte */ +#define SHPC_CAP_CxP 0x3 /* 1 byte: CSP, CIP */ +#define SHPC_CAP_DWORD_DATA 0x4 /* 4 bytes */ +#define SHPC_CAP_CSP_MASK 0x4 +#define SHPC_CAP_CIP_MASK 0x8 + +static uint8_t shpc_cap_dword(PCIDevice *d) +{ + return pci_get_byte(d->config + d->shpc->cap + SHPC_CAP_DWORD_SELECT); +} + +/* Update dword data capability register */ +static void shpc_cap_update_dword(PCIDevice *d) +{ + unsigned data; + data = shpc_read(d, shpc_cap_dword(d) * 4, 4); + pci_set_long(d->config + d->shpc->cap + SHPC_CAP_DWORD_DATA, data); +} + +/* Add SHPC capability to the config space for the device. */ +static int shpc_cap_add_config(PCIDevice *d) +{ + uint8_t *config; + int config_offset; + config_offset = pci_add_capability(d, PCI_CAP_ID_SHPC, + 0, SHPC_CAP_LENGTH); + if (config_offset < 0) { + return config_offset; + } + config = d->config + config_offset; + + pci_set_byte(config + SHPC_CAP_DWORD_SELECT, 0); + pci_set_byte(config + SHPC_CAP_CxP, 0); + pci_set_long(config + SHPC_CAP_DWORD_DATA, 0); + d->shpc->cap = config_offset; + /* Make dword select and data writeable. */ + pci_set_byte(d->wmask + config_offset + SHPC_CAP_DWORD_SELECT, 0xff); + pci_set_long(d->wmask + config_offset + SHPC_CAP_DWORD_DATA, 0xffffffff); + return 0; +} + +static uint64_t shpc_mmio_read(void *opaque, hwaddr addr, + unsigned size) +{ + return shpc_read(opaque, addr, size); +} + +static void shpc_mmio_write(void *opaque, hwaddr addr, + uint64_t val, unsigned size) +{ + shpc_write(opaque, addr, val, size); +} + +static const MemoryRegionOps shpc_mmio_ops = { + .read = shpc_mmio_read, + .write = shpc_mmio_write, + .endianness = DEVICE_LITTLE_ENDIAN, + .valid = { + /* SHPC ECN requires dword accesses, but the original 1.0 spec doesn't. + * It's easier to suppport all sizes than worry about it. */ + .min_access_size = 1, + .max_access_size = 4, + }, +}; +static void shpc_device_hotplug_common(PCIDevice *affected_dev, int *slot, + SHPCDevice *shpc, Error **errp) +{ + int pci_slot = PCI_SLOT(affected_dev->devfn); + *slot = SHPC_PCI_TO_IDX(pci_slot); + + if (pci_slot < SHPC_IDX_TO_PCI(0) || *slot >= shpc->nslots) { + error_setg(errp, "Unsupported PCI slot %d for standard hotplug " + "controller. Valid slots are between %d and %d.", + pci_slot, SHPC_IDX_TO_PCI(0), + SHPC_IDX_TO_PCI(shpc->nslots) - 1); + return; + } +} + +void shpc_device_hotplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, + Error **errp) +{ + Error *local_err = NULL; + PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev); + SHPCDevice *shpc = pci_hotplug_dev->shpc; + int slot; + + shpc_device_hotplug_common(PCI_DEVICE(dev), &slot, shpc, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + /* Don't send event when device is enabled during qemu machine creation: + * it is present on boot, no hotplug event is necessary. We do send an + * event when the device is disabled later. */ + if (!dev->hotplugged) { + shpc_set_status(shpc, slot, 0, SHPC_SLOT_STATUS_MRL_OPEN); + shpc_set_status(shpc, slot, SHPC_SLOT_STATUS_PRSNT_7_5W, + SHPC_SLOT_STATUS_PRSNT_MASK); + return; + } + + /* This could be a cancellation of the previous removal. + * We check MRL state to figure out. */ + if (shpc_get_status(shpc, slot, SHPC_SLOT_STATUS_MRL_OPEN)) { + shpc_set_status(shpc, slot, 0, SHPC_SLOT_STATUS_MRL_OPEN); + shpc_set_status(shpc, slot, SHPC_SLOT_STATUS_PRSNT_7_5W, + SHPC_SLOT_STATUS_PRSNT_MASK); + shpc->config[SHPC_SLOT_EVENT_LATCH(slot)] |= + SHPC_SLOT_EVENT_BUTTON | + SHPC_SLOT_EVENT_MRL | + SHPC_SLOT_EVENT_PRESENCE; + } else { + /* Press attention button to cancel removal */ + shpc->config[SHPC_SLOT_EVENT_LATCH(slot)] |= + SHPC_SLOT_EVENT_BUTTON; + } + shpc_set_status(shpc, slot, 0, SHPC_SLOT_STATUS_66); + shpc_interrupt_update(pci_hotplug_dev); +} + +void shpc_device_hot_unplug_request_cb(HotplugHandler *hotplug_dev, + DeviceState *dev, Error **errp) +{ + Error *local_err = NULL; + PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev); + SHPCDevice *shpc = pci_hotplug_dev->shpc; + uint8_t state; + uint8_t led; + int slot; + + shpc_device_hotplug_common(PCI_DEVICE(dev), &slot, shpc, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + shpc->config[SHPC_SLOT_EVENT_LATCH(slot)] |= SHPC_SLOT_EVENT_BUTTON; + state = shpc_get_status(shpc, slot, SHPC_SLOT_STATE_MASK); + led = shpc_get_status(shpc, slot, SHPC_SLOT_PWR_LED_MASK); + if (state == SHPC_STATE_DISABLED && led == SHPC_LED_OFF) { + shpc_free_devices_in_slot(shpc, slot); + shpc_set_status(shpc, slot, 1, SHPC_SLOT_STATUS_MRL_OPEN); + shpc_set_status(shpc, slot, SHPC_SLOT_STATUS_PRSNT_EMPTY, + SHPC_SLOT_STATUS_PRSNT_MASK); + shpc->config[SHPC_SLOT_EVENT_LATCH(slot)] |= + SHPC_SLOT_EVENT_MRL | + SHPC_SLOT_EVENT_PRESENCE; + } + shpc_set_status(shpc, slot, 0, SHPC_SLOT_STATUS_66); + shpc_interrupt_update(pci_hotplug_dev); +} + +/* Initialize the SHPC structure in bridge's BAR. */ +int shpc_init(PCIDevice *d, PCIBus *sec_bus, MemoryRegion *bar, unsigned offset) +{ + int i, ret; + int nslots = SHPC_MAX_SLOTS; /* TODO: qdev property? */ + SHPCDevice *shpc = d->shpc = g_malloc0(sizeof(*d->shpc)); + shpc->sec_bus = sec_bus; + ret = shpc_cap_add_config(d); + if (ret) { + g_free(d->shpc); + return ret; + } + if (nslots < SHPC_MIN_SLOTS) { + return 0; + } + if (nslots > SHPC_MAX_SLOTS || + SHPC_IDX_TO_PCI(nslots) > PCI_SLOT_MAX) { + /* TODO: report an error mesage that makes sense. */ + return -EINVAL; + } + shpc->nslots = nslots; + shpc->config = g_malloc0(SHPC_SIZEOF(d)); + shpc->cmask = g_malloc0(SHPC_SIZEOF(d)); + shpc->wmask = g_malloc0(SHPC_SIZEOF(d)); + shpc->w1cmask = g_malloc0(SHPC_SIZEOF(d)); + + shpc_reset(d); + + pci_set_long(shpc->config + SHPC_BASE_OFFSET, offset); + + pci_set_byte(shpc->wmask + SHPC_CMD_CODE, 0xff); + pci_set_byte(shpc->wmask + SHPC_CMD_TRGT, SHPC_CMD_TRGT_MAX); + pci_set_byte(shpc->wmask + SHPC_CMD_TRGT, SHPC_CMD_TRGT_MAX); + pci_set_long(shpc->wmask + SHPC_SERR_INT, + SHPC_INT_DIS | + SHPC_SERR_DIS | + SHPC_CMD_INT_DIS | + SHPC_ARB_SERR_DIS); + pci_set_long(shpc->w1cmask + SHPC_SERR_INT, + SHPC_CMD_DETECTED | + SHPC_ARB_DETECTED); + for (i = 0; i < nslots; ++i) { + pci_set_byte(shpc->wmask + + SHPC_SLOT_EVENT_SERR_INT_DIS(d, i), + SHPC_SLOT_EVENT_PRESENCE | + SHPC_SLOT_EVENT_ISOLATED_FAULT | + SHPC_SLOT_EVENT_BUTTON | + SHPC_SLOT_EVENT_MRL | + SHPC_SLOT_EVENT_CONNECTED_FAULT | + SHPC_SLOT_EVENT_MRL_SERR_DIS | + SHPC_SLOT_EVENT_CONNECTED_FAULT_SERR_DIS); + pci_set_byte(shpc->w1cmask + + SHPC_SLOT_EVENT_LATCH(i), + SHPC_SLOT_EVENT_PRESENCE | + SHPC_SLOT_EVENT_ISOLATED_FAULT | + SHPC_SLOT_EVENT_BUTTON | + SHPC_SLOT_EVENT_MRL | + SHPC_SLOT_EVENT_CONNECTED_FAULT); + } + + /* TODO: init cmask */ + memory_region_init_io(&shpc->mmio, OBJECT(d), &shpc_mmio_ops, + d, "shpc-mmio", SHPC_SIZEOF(d)); + shpc_cap_update_dword(d); + memory_region_add_subregion(bar, offset, &shpc->mmio); + + qbus_set_hotplug_handler(BUS(sec_bus), DEVICE(d), NULL); + + d->cap_present |= QEMU_PCI_CAP_SHPC; + return 0; +} + +int shpc_bar_size(PCIDevice *d) +{ + return roundup_pow_of_two(SHPC_SLOT_REG(SHPC_MAX_SLOTS)); +} + +void shpc_cleanup(PCIDevice *d, MemoryRegion *bar) +{ + SHPCDevice *shpc = d->shpc; + d->cap_present &= ~QEMU_PCI_CAP_SHPC; + memory_region_del_subregion(bar, &shpc->mmio); + /* TODO: cleanup config space changes? */ +} + +void shpc_free(PCIDevice *d) +{ + SHPCDevice *shpc = d->shpc; + if (!shpc) { + return; + } + object_unparent(OBJECT(&shpc->mmio)); + g_free(shpc->config); + g_free(shpc->cmask); + g_free(shpc->wmask); + g_free(shpc->w1cmask); + g_free(shpc); + d->shpc = NULL; +} + +void shpc_cap_write_config(PCIDevice *d, uint32_t addr, uint32_t val, int l) +{ + if (!ranges_overlap(addr, l, d->shpc->cap, SHPC_CAP_LENGTH)) { + return; + } + if (ranges_overlap(addr, l, d->shpc->cap + SHPC_CAP_DWORD_DATA, 4)) { + unsigned dword_data; + dword_data = pci_get_long(d->shpc->config + d->shpc->cap + + SHPC_CAP_DWORD_DATA); + shpc_write(d, shpc_cap_dword(d) * 4, dword_data, 4); + } + /* Update cap dword data in case guest is going to read it. */ + shpc_cap_update_dword(d); +} + +static void shpc_save(QEMUFile *f, void *pv, size_t size) +{ + PCIDevice *d = container_of(pv, PCIDevice, shpc); + qemu_put_buffer(f, d->shpc->config, SHPC_SIZEOF(d)); +} + +static int shpc_load(QEMUFile *f, void *pv, size_t size) +{ + PCIDevice *d = container_of(pv, PCIDevice, shpc); + int ret = qemu_get_buffer(f, d->shpc->config, SHPC_SIZEOF(d)); + if (ret != SHPC_SIZEOF(d)) { + return -EINVAL; + } + /* Make sure we don't lose notifications. An extra interrupt is harmless. */ + d->shpc->msi_requested = 0; + shpc_interrupt_update(d); + return 0; +} + +VMStateInfo shpc_vmstate_info = { + .name = "shpc", + .get = shpc_load, + .put = shpc_save, +}; |
