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qemu/hw/pci/shpc.c
Vladimir Sementsov-Ogievskiy 86f0aa1d43 hw/pci: add some convenient trace-events for pcie and shpc hotplug 
Add trace-events that may help to debug problems with hotplugging.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240301154146.761531-2-vsementsov@yandex-team.ru>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2024-03-11 22:09:42 +01:00

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26 KiB
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#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/host-utils.h"
#include "qemu/range.h"
#include "qemu/error-report.h"
#include "hw/pci/shpc.h"
#include "migration/qemu-file-types.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_bus.h"
#include "hw/pci/msi.h"
#include "trace.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 const char *shpc_led_state_to_str(uint8_t value)
{
switch (value) {
case SHPC_LED_ON:
return "on";
case SHPC_LED_BLINK:
return "blink";
case SHPC_LED_OFF:
return "off";
default:
return "invalid";
}
}
static const char *shpc_slot_state_to_str(uint8_t value)
{
switch (value) {
case SHPC_STATE_PWRONLY:
return "power-only";
case SHPC_STATE_ENABLED:
return "enabled";
case SHPC_STATE_DISABLED:
return "disabled";
default:
return "invalid";
}
}
static uint8_t shpc_get_status(SHPCDevice *shpc, int slot, uint16_t msk)
{
uint8_t *status = shpc->config + SHPC_SLOT_STATUS(slot);
uint16_t result = (pci_get_word(status) & msk) >> ctz32(msk);
assert(result <= UINT8_MAX);
return result;
}
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, SHPC_LED_OFF, SHPC_SLOT_ATTN_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)
{
HotplugHandler *hotplug_ctrl;
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) {
hotplug_ctrl = qdev_get_hotplug_handler(DEVICE(affected_dev));
hotplug_handler_unplug(hotplug_ctrl, DEVICE(affected_dev),
&error_abort);
object_unparent(OBJECT(affected_dev));
}
}
}
static bool shpc_slot_is_off(uint8_t state, uint8_t power, uint8_t attn)
{
return state == SHPC_STATE_DISABLED && power == SHPC_LED_OFF;
}
static void shpc_slot_command(PCIDevice *d, uint8_t target,
uint8_t state, uint8_t power, uint8_t attn)
{
SHPCDevice *shpc = d->shpc;
int slot = SHPC_LOGICAL_TO_IDX(target);
uint8_t old_state = shpc_get_status(shpc, slot, SHPC_SLOT_STATE_MASK);
uint8_t old_power = shpc_get_status(shpc, slot, SHPC_SLOT_PWR_LED_MASK);
uint8_t old_attn = shpc_get_status(shpc, slot, SHPC_SLOT_ATTN_LED_MASK);
if (target < SHPC_CMD_TRGT_MIN || slot >= shpc->nslots) {
shpc_invalid_command(shpc);
return;
}
if (old_state == SHPC_STATE_ENABLED && state == SHPC_STATE_PWRONLY) {
shpc_invalid_command(shpc);
return;
}
if (power == SHPC_LED_NO) {
power = old_power;
} else {
/* TODO: send event to monitor */
shpc_set_status(shpc, slot, power, SHPC_SLOT_PWR_LED_MASK);
}
if (attn == SHPC_LED_NO) {
attn = old_attn;
} else {
/* TODO: send event to monitor */
shpc_set_status(shpc, slot, attn, SHPC_SLOT_ATTN_LED_MASK);
}
if (state == SHPC_STATE_NO) {
state = old_state;
} else {
shpc_set_status(shpc, slot, state, SHPC_SLOT_STATE_MASK);
}
if (trace_event_get_state_backends(TRACE_SHPC_SLOT_COMMAND)) {
DeviceState *parent = DEVICE(d);
int pci_slot = SHPC_IDX_TO_PCI(slot);
DeviceState *child =
DEVICE(shpc->sec_bus->devices[PCI_DEVFN(pci_slot, 0)]);
trace_shpc_slot_command(
parent->canonical_path, pci_slot,
child ? child->canonical_path : "no-child",
shpc_led_state_to_str(old_power),
shpc_led_state_to_str(power),
shpc_led_state_to_str(old_attn),
shpc_led_state_to_str(attn),
shpc_slot_state_to_str(old_state),
shpc_slot_state_to_str(state));
}
if (!shpc_slot_is_off(old_state, old_power, old_attn) &&
shpc_slot_is_off(state, power, attn))
{
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;
}
}
static void shpc_command(PCIDevice *d)
{
SHPCDevice *shpc = d->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(d, 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(d, i + SHPC_CMD_TRGT_MIN,
SHPC_STATE_PWRONLY, SHPC_LED_ON, SHPC_LED_NO);
} else {
shpc_slot_command(d, 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(d, i + SHPC_CMD_TRGT_MIN,
SHPC_STATE_ENABLED, SHPC_LED_ON, SHPC_LED_NO);
} else {
shpc_slot_command(d, 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(d);
}
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, Error **errp)
{
uint8_t *config;
int config_offset;
config_offset = pci_add_capability(d, PCI_CAP_ID_SHPC,
0, SHPC_CAP_LENGTH,
errp);
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 writable. */
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 support all sizes than worry about it.
*/
.min_access_size = 1,
.max_access_size = 4,
},
};
static bool shpc_device_get_slot(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 false;
}
return true;
}
void shpc_device_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
SHPCDevice *shpc = pci_hotplug_dev->shpc;
int slot;
if (!shpc_device_get_slot(PCI_DEVICE(dev), &slot, shpc, errp)) {
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_unplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
qdev_unrealize(dev);
}
void shpc_device_unplug_request_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev);
SHPCDevice *shpc = pci_hotplug_dev->shpc;
uint8_t state;
uint8_t led;
int slot;
if (!shpc_device_get_slot(PCI_DEVICE(dev), &slot, shpc, errp)) {
return;
}
state = shpc_get_status(shpc, slot, SHPC_SLOT_STATE_MASK);
led = shpc_get_status(shpc, slot, SHPC_SLOT_PWR_LED_MASK);
if (led == SHPC_LED_BLINK) {
error_setg(errp, "Hot-unplug failed: "
"guest is busy (power indicator blinking)");
return;
}
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;
} else {
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);
}
/* Initialize the SHPC structure in bridge's BAR. */
int shpc_init(PCIDevice *d, PCIBus *sec_bus, MemoryRegion *bar,
unsigned offset, Error **errp)
{
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, errp);
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 message 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), OBJECT(d));
d->cap_present |= QEMU_PCI_CAP_SHPC;
return 0;
}
int shpc_bar_size(PCIDevice *d)
{
return pow2roundup32(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 int shpc_save(QEMUFile *f, void *pv, size_t size,
const VMStateField *field, JSONWriter *vmdesc)
{
PCIDevice *d = container_of(pv, PCIDevice, shpc);
qemu_put_buffer(f, d->shpc->config, SHPC_SIZEOF(d));
return 0;
}
static int shpc_load(QEMUFile *f, void *pv, size_t size,
const VMStateField *field)
{
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;
}
const VMStateInfo shpc_vmstate_info = {
.name = "shpc",
.get = shpc_load,
.put = shpc_save,
};
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