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qemu-e2k/hw/pci/pcie_aer.c
Frederic Barrat 2e8656710a pcie: Don't try triggering a LSI when not defined 
This patch skips [de]asserting a LSI interrupt if the device doesn't
have any LSI defined. Doing so would trigger an assert in
pci_irq_handler().

The PCIE root port implementation in qemu requests a LSI (INTA), but a
subclass may want to change that behavior since it's a valid
configuration. For example on the POWER8/POWER9/POWER10 systems, the
root bridge doesn't request any LSI.

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20220408131303.147840-2-fbarrat@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
2022-04-20 18:00:30 -03:00

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/*
* pcie_aer.c
*
* Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp>
* VA Linux Systems Japan K.K.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "sysemu/sysemu.h"
#include "qapi/qmp/qdict.h"
#include "migration/vmstate.h"
#include "monitor/monitor.h"
#include "hw/pci/pci_bridge.h"
#include "hw/pci/pcie.h"
#include "hw/pci/msix.h"
#include "hw/pci/msi.h"
#include "hw/pci/pci_bus.h"
#include "hw/pci/pcie_regs.h"
#include "qapi/error.h"
//#define DEBUG_PCIE
#ifdef DEBUG_PCIE
# define PCIE_DPRINTF(fmt, ...) \
fprintf(stderr, "%s:%d " fmt, __func__, __LINE__, ## __VA_ARGS__)
#else
# define PCIE_DPRINTF(fmt, ...) do {} while (0)
#endif
#define PCIE_DEV_PRINTF(dev, fmt, ...) \
PCIE_DPRINTF("%s:%x "fmt, (dev)->name, (dev)->devfn, ## __VA_ARGS__)
#define PCI_ERR_SRC_COR_OFFS 0
#define PCI_ERR_SRC_UNCOR_OFFS 2
typedef struct PCIEErrorDetails {
const char *id;
const char *root_bus;
int bus;
int devfn;
} PCIEErrorDetails;
/* From 6.2.7 Error Listing and Rules. Table 6-2, 6-3 and 6-4 */
static uint32_t pcie_aer_uncor_default_severity(uint32_t status)
{
switch (status) {
case PCI_ERR_UNC_INTN:
case PCI_ERR_UNC_DLP:
case PCI_ERR_UNC_SDN:
case PCI_ERR_UNC_RX_OVER:
case PCI_ERR_UNC_FCP:
case PCI_ERR_UNC_MALF_TLP:
return PCI_ERR_ROOT_CMD_FATAL_EN;
case PCI_ERR_UNC_POISON_TLP:
case PCI_ERR_UNC_ECRC:
case PCI_ERR_UNC_UNSUP:
case PCI_ERR_UNC_COMP_TIME:
case PCI_ERR_UNC_COMP_ABORT:
case PCI_ERR_UNC_UNX_COMP:
case PCI_ERR_UNC_ACSV:
case PCI_ERR_UNC_MCBTLP:
case PCI_ERR_UNC_ATOP_EBLOCKED:
case PCI_ERR_UNC_TLP_PRF_BLOCKED:
return PCI_ERR_ROOT_CMD_NONFATAL_EN;
default:
abort();
break;
}
return PCI_ERR_ROOT_CMD_FATAL_EN;
}
static int aer_log_add_err(PCIEAERLog *aer_log, const PCIEAERErr *err)
{
if (aer_log->log_num == aer_log->log_max) {
return -1;
}
memcpy(&aer_log->log[aer_log->log_num], err, sizeof *err);
aer_log->log_num++;
return 0;
}
static void aer_log_del_err(PCIEAERLog *aer_log, PCIEAERErr *err)
{
assert(aer_log->log_num);
*err = aer_log->log[0];
aer_log->log_num--;
memmove(&aer_log->log[0], &aer_log->log[1],
aer_log->log_num * sizeof *err);
}
static void aer_log_clear_all_err(PCIEAERLog *aer_log)
{
aer_log->log_num = 0;
}
int pcie_aer_init(PCIDevice *dev, uint8_t cap_ver, uint16_t offset,
uint16_t size, Error **errp)
{
pcie_add_capability(dev, PCI_EXT_CAP_ID_ERR, cap_ver,
offset, size);
dev->exp.aer_cap = offset;
/* clip down the value to avoid unreasonable memory usage */
if (dev->exp.aer_log.log_max > PCIE_AER_LOG_MAX_LIMIT) {
error_setg(errp, "Invalid aer_log_max %d. The max number of aer log "
"is %d", dev->exp.aer_log.log_max, PCIE_AER_LOG_MAX_LIMIT);
return -EINVAL;
}
dev->exp.aer_log.log = g_malloc0(sizeof dev->exp.aer_log.log[0] *
dev->exp.aer_log.log_max);
pci_set_long(dev->w1cmask + offset + PCI_ERR_UNCOR_STATUS,
PCI_ERR_UNC_SUPPORTED);
pci_set_long(dev->config + offset + PCI_ERR_UNCOR_SEVER,
PCI_ERR_UNC_SEVERITY_DEFAULT);
pci_set_long(dev->wmask + offset + PCI_ERR_UNCOR_SEVER,
PCI_ERR_UNC_SUPPORTED);
pci_long_test_and_set_mask(dev->w1cmask + offset + PCI_ERR_COR_STATUS,
PCI_ERR_COR_SUPPORTED);
pci_set_long(dev->config + offset + PCI_ERR_COR_MASK,
PCI_ERR_COR_MASK_DEFAULT);
pci_set_long(dev->wmask + offset + PCI_ERR_COR_MASK,
PCI_ERR_COR_SUPPORTED);
/* capabilities and control. multiple header logging is supported */
if (dev->exp.aer_log.log_max > 0) {
pci_set_long(dev->config + offset + PCI_ERR_CAP,
PCI_ERR_CAP_ECRC_GENC | PCI_ERR_CAP_ECRC_CHKC |
PCI_ERR_CAP_MHRC);
pci_set_long(dev->wmask + offset + PCI_ERR_CAP,
PCI_ERR_CAP_ECRC_GENE | PCI_ERR_CAP_ECRC_CHKE |
PCI_ERR_CAP_MHRE);
} else {
pci_set_long(dev->config + offset + PCI_ERR_CAP,
PCI_ERR_CAP_ECRC_GENC | PCI_ERR_CAP_ECRC_CHKC);
pci_set_long(dev->wmask + offset + PCI_ERR_CAP,
PCI_ERR_CAP_ECRC_GENE | PCI_ERR_CAP_ECRC_CHKE);
}
switch (pcie_cap_get_type(dev)) {
case PCI_EXP_TYPE_ROOT_PORT:
/* this case will be set by pcie_aer_root_init() */
/* fallthrough */
case PCI_EXP_TYPE_DOWNSTREAM:
case PCI_EXP_TYPE_UPSTREAM:
pci_word_test_and_set_mask(dev->wmask + PCI_BRIDGE_CONTROL,
PCI_BRIDGE_CTL_SERR);
pci_long_test_and_set_mask(dev->w1cmask + PCI_STATUS,
PCI_SEC_STATUS_RCV_SYSTEM_ERROR);
break;
default:
/* nothing */
break;
}
return 0;
}
void pcie_aer_exit(PCIDevice *dev)
{
g_free(dev->exp.aer_log.log);
}
static void pcie_aer_update_uncor_status(PCIDevice *dev)
{
uint8_t *aer_cap = dev->config + dev->exp.aer_cap;
PCIEAERLog *aer_log = &dev->exp.aer_log;
uint16_t i;
for (i = 0; i < aer_log->log_num; i++) {
pci_long_test_and_set_mask(aer_cap + PCI_ERR_UNCOR_STATUS,
dev->exp.aer_log.log[i].status);
}
}
/*
* return value:
* true: error message needs to be sent up
* false: error message is masked
*
* 6.2.6 Error Message Control
* Figure 6-3
* all pci express devices part
*/
static bool
pcie_aer_msg_alldev(PCIDevice *dev, const PCIEAERMsg *msg)
{
if (!(pcie_aer_msg_is_uncor(msg) &&
(pci_get_word(dev->config + PCI_COMMAND) & PCI_COMMAND_SERR))) {
return false;
}
/* Signaled System Error
*
* 7.5.1.1 Command register
* Bit 8 SERR# Enable
*
* When Set, this bit enables reporting of Non-fatal and Fatal
* errors detected by the Function to the Root Complex. Note that
* errors are reported if enabled either through this bit or through
* the PCI Express specific bits in the Device Control register (see
* Section 7.8.4).
*/
pci_word_test_and_set_mask(dev->config + PCI_STATUS,
PCI_STATUS_SIG_SYSTEM_ERROR);
if (!(msg->severity &
pci_get_word(dev->config + dev->exp.exp_cap + PCI_EXP_DEVCTL))) {
return false;
}
/* send up error message */
return true;
}
/*
* return value:
* true: error message is sent up
* false: error message is masked
*
* 6.2.6 Error Message Control
* Figure 6-3
* virtual pci bridge part
*/
static bool pcie_aer_msg_vbridge(PCIDevice *dev, const PCIEAERMsg *msg)
{
uint16_t bridge_control = pci_get_word(dev->config + PCI_BRIDGE_CONTROL);
if (pcie_aer_msg_is_uncor(msg)) {
/* Received System Error */
pci_word_test_and_set_mask(dev->config + PCI_SEC_STATUS,
PCI_SEC_STATUS_RCV_SYSTEM_ERROR);
}
if (!(bridge_control & PCI_BRIDGE_CTL_SERR)) {
return false;
}
return true;
}
void pcie_aer_root_set_vector(PCIDevice *dev, unsigned int vector)
{
uint8_t *aer_cap = dev->config + dev->exp.aer_cap;
assert(vector < PCI_ERR_ROOT_IRQ_MAX);
pci_long_test_and_clear_mask(aer_cap + PCI_ERR_ROOT_STATUS,
PCI_ERR_ROOT_IRQ);
pci_long_test_and_set_mask(aer_cap + PCI_ERR_ROOT_STATUS,
vector << PCI_ERR_ROOT_IRQ_SHIFT);
}
static unsigned int pcie_aer_root_get_vector(PCIDevice *dev)
{
uint8_t *aer_cap = dev->config + dev->exp.aer_cap;
uint32_t root_status = pci_get_long(aer_cap + PCI_ERR_ROOT_STATUS);
return (root_status & PCI_ERR_ROOT_IRQ) >> PCI_ERR_ROOT_IRQ_SHIFT;
}
/* Given a status register, get corresponding bits in the command register */
static uint32_t pcie_aer_status_to_cmd(uint32_t status)
{
uint32_t cmd = 0;
if (status & PCI_ERR_ROOT_COR_RCV) {
cmd |= PCI_ERR_ROOT_CMD_COR_EN;
}
if (status & PCI_ERR_ROOT_NONFATAL_RCV) {
cmd |= PCI_ERR_ROOT_CMD_NONFATAL_EN;
}
if (status & PCI_ERR_ROOT_FATAL_RCV) {
cmd |= PCI_ERR_ROOT_CMD_FATAL_EN;
}
return cmd;
}
static void pcie_aer_root_notify(PCIDevice *dev)
{
if (msix_enabled(dev)) {
msix_notify(dev, pcie_aer_root_get_vector(dev));
} else if (msi_enabled(dev)) {
msi_notify(dev, pcie_aer_root_get_vector(dev));
} else if (pci_intx(dev) != -1) {
pci_irq_assert(dev);
}
}
/*
* 6.2.6 Error Message Control
* Figure 6-3
* root port part
*/
static void pcie_aer_msg_root_port(PCIDevice *dev, const PCIEAERMsg *msg)
{
uint16_t cmd;
uint8_t *aer_cap;
uint32_t root_cmd;
uint32_t root_status, prev_status;
cmd = pci_get_word(dev->config + PCI_COMMAND);
aer_cap = dev->config + dev->exp.aer_cap;
root_cmd = pci_get_long(aer_cap + PCI_ERR_ROOT_COMMAND);
prev_status = root_status = pci_get_long(aer_cap + PCI_ERR_ROOT_STATUS);
if (cmd & PCI_COMMAND_SERR) {
/* System Error.
*
* The way to report System Error is platform specific and
* it isn't implemented in qemu right now.
* So just discard the error for now.
* OS which cares of aer would receive errors via
* native aer mechanims, so this wouldn't matter.
*/
}
/* Errro Message Received: Root Error Status register */
switch (msg->severity) {
case PCI_ERR_ROOT_CMD_COR_EN:
if (root_status & PCI_ERR_ROOT_COR_RCV) {
root_status |= PCI_ERR_ROOT_MULTI_COR_RCV;
} else {
pci_set_word(aer_cap + PCI_ERR_ROOT_ERR_SRC + PCI_ERR_SRC_COR_OFFS,
msg->source_id);
}
root_status |= PCI_ERR_ROOT_COR_RCV;
break;
case PCI_ERR_ROOT_CMD_NONFATAL_EN:
root_status |= PCI_ERR_ROOT_NONFATAL_RCV;
break;
case PCI_ERR_ROOT_CMD_FATAL_EN:
if (!(root_status & PCI_ERR_ROOT_UNCOR_RCV)) {
root_status |= PCI_ERR_ROOT_FIRST_FATAL;
}
root_status |= PCI_ERR_ROOT_FATAL_RCV;
break;
default:
abort();
break;
}
if (pcie_aer_msg_is_uncor(msg)) {
if (root_status & PCI_ERR_ROOT_UNCOR_RCV) {
root_status |= PCI_ERR_ROOT_MULTI_UNCOR_RCV;
} else {
pci_set_word(aer_cap + PCI_ERR_ROOT_ERR_SRC +
PCI_ERR_SRC_UNCOR_OFFS, msg->source_id);
}
root_status |= PCI_ERR_ROOT_UNCOR_RCV;
}
pci_set_long(aer_cap + PCI_ERR_ROOT_STATUS, root_status);
/* 6.2.4.1.2 Interrupt Generation */
/* All the above did was set some bits in the status register.
* Specifically these that match message severity.
* The below code relies on this fact. */
if (!(root_cmd & msg->severity) ||
(pcie_aer_status_to_cmd(prev_status) & root_cmd)) {
/* Condition is not being set or was already true so nothing to do. */
return;
}
pcie_aer_root_notify(dev);
}
/*
* 6.2.6 Error Message Control Figure 6-3
*
* Walk up the bus tree from the device, propagate the error message.
*/
static void pcie_aer_msg(PCIDevice *dev, const PCIEAERMsg *msg)
{
uint8_t type;
while (dev) {
if (!pci_is_express(dev)) {
/* just ignore it */
/* TODO: Shouldn't we set PCI_STATUS_SIG_SYSTEM_ERROR?
* Consider e.g. a PCI bridge above a PCI Express device. */
return;
}
type = pcie_cap_get_type(dev);
if ((type == PCI_EXP_TYPE_ROOT_PORT ||
type == PCI_EXP_TYPE_UPSTREAM ||
type == PCI_EXP_TYPE_DOWNSTREAM) &&
!pcie_aer_msg_vbridge(dev, msg)) {
return;
}
if (!pcie_aer_msg_alldev(dev, msg)) {
return;
}
if (type == PCI_EXP_TYPE_ROOT_PORT) {
pcie_aer_msg_root_port(dev, msg);
/* Root port can notify system itself,
or send the error message to root complex event collector. */
/*
* if root port is associated with an event collector,
* return the root complex event collector here.
* For now root complex event collector isn't supported.
*/
return;
}
dev = pci_bridge_get_device(pci_get_bus(dev));
}
}
static void pcie_aer_update_log(PCIDevice *dev, const PCIEAERErr *err)
{
uint8_t *aer_cap = dev->config + dev->exp.aer_cap;
uint8_t first_bit = ctz32(err->status);
uint32_t errcap = pci_get_long(aer_cap + PCI_ERR_CAP);
int i;
assert(err->status);
assert(!(err->status & (err->status - 1)));
errcap &= ~(PCI_ERR_CAP_FEP_MASK | PCI_ERR_CAP_TLP);
errcap |= PCI_ERR_CAP_FEP(first_bit);
if (err->flags & PCIE_AER_ERR_HEADER_VALID) {
for (i = 0; i < ARRAY_SIZE(err->header); ++i) {
/* 7.10.8 Header Log Register */
uint8_t *header_log =
aer_cap + PCI_ERR_HEADER_LOG + i * sizeof err->header[0];
stl_be_p(header_log, err->header[i]);
}
} else {
assert(!(err->flags & PCIE_AER_ERR_TLP_PREFIX_PRESENT));
memset(aer_cap + PCI_ERR_HEADER_LOG, 0, PCI_ERR_HEADER_LOG_SIZE);
}
if ((err->flags & PCIE_AER_ERR_TLP_PREFIX_PRESENT) &&
(pci_get_long(dev->config + dev->exp.exp_cap + PCI_EXP_DEVCAP2) &
PCI_EXP_DEVCAP2_EETLPP)) {
for (i = 0; i < ARRAY_SIZE(err->prefix); ++i) {
/* 7.10.12 tlp prefix log register */
uint8_t *prefix_log =
aer_cap + PCI_ERR_TLP_PREFIX_LOG + i * sizeof err->prefix[0];
stl_be_p(prefix_log, err->prefix[i]);
}
errcap |= PCI_ERR_CAP_TLP;
} else {
memset(aer_cap + PCI_ERR_TLP_PREFIX_LOG, 0,
PCI_ERR_TLP_PREFIX_LOG_SIZE);
}
pci_set_long(aer_cap + PCI_ERR_CAP, errcap);
}
static void pcie_aer_clear_log(PCIDevice *dev)
{
uint8_t *aer_cap = dev->config + dev->exp.aer_cap;
pci_long_test_and_clear_mask(aer_cap + PCI_ERR_CAP,
PCI_ERR_CAP_FEP_MASK | PCI_ERR_CAP_TLP);
memset(aer_cap + PCI_ERR_HEADER_LOG, 0, PCI_ERR_HEADER_LOG_SIZE);
memset(aer_cap + PCI_ERR_TLP_PREFIX_LOG, 0, PCI_ERR_TLP_PREFIX_LOG_SIZE);
}
static void pcie_aer_clear_error(PCIDevice *dev)
{
uint8_t *aer_cap = dev->config + dev->exp.aer_cap;
uint32_t errcap = pci_get_long(aer_cap + PCI_ERR_CAP);
PCIEAERLog *aer_log = &dev->exp.aer_log;
PCIEAERErr err;
if (!(errcap & PCI_ERR_CAP_MHRE) || !aer_log->log_num) {
pcie_aer_clear_log(dev);
return;
}
/*
* If more errors are queued, set corresponding bits in uncorrectable
* error status.
* We emulate uncorrectable error status register as W1CS.
* So set bit in uncorrectable error status here again for multiple
* error recording support.
*
* 6.2.4.2 Multiple Error Handling(Advanced Error Reporting Capability)
*/
pcie_aer_update_uncor_status(dev);
aer_log_del_err(aer_log, &err);
pcie_aer_update_log(dev, &err);
}
static int pcie_aer_record_error(PCIDevice *dev,
const PCIEAERErr *err)
{
uint8_t *aer_cap = dev->config + dev->exp.aer_cap;
uint32_t errcap = pci_get_long(aer_cap + PCI_ERR_CAP);
int fep = PCI_ERR_CAP_FEP(errcap);
assert(err->status);
assert(!(err->status & (err->status - 1)));
if (errcap & PCI_ERR_CAP_MHRE &&
(pci_get_long(aer_cap + PCI_ERR_UNCOR_STATUS) & (1U << fep))) {
/* Not first error. queue error */
if (aer_log_add_err(&dev->exp.aer_log, err) < 0) {
/* overflow */
return -1;
}
return 0;
}
pcie_aer_update_log(dev, err);
return 0;
}
typedef struct PCIEAERInject {
PCIDevice *dev;
uint8_t *aer_cap;
const PCIEAERErr *err;
uint16_t devctl;
uint16_t devsta;
uint32_t error_status;
bool unsupported_request;
bool log_overflow;
PCIEAERMsg msg;
} PCIEAERInject;
static bool pcie_aer_inject_cor_error(PCIEAERInject *inj,
uint32_t uncor_status,
bool is_advisory_nonfatal)
{
PCIDevice *dev = inj->dev;
inj->devsta |= PCI_EXP_DEVSTA_CED;
if (inj->unsupported_request) {
inj->devsta |= PCI_EXP_DEVSTA_URD;
}
pci_set_word(dev->config + dev->exp.exp_cap + PCI_EXP_DEVSTA, inj->devsta);
if (inj->aer_cap) {
uint32_t mask;
pci_long_test_and_set_mask(inj->aer_cap + PCI_ERR_COR_STATUS,
inj->error_status);
mask = pci_get_long(inj->aer_cap + PCI_ERR_COR_MASK);
if (mask & inj->error_status) {
return false;
}
if (is_advisory_nonfatal) {
uint32_t uncor_mask =
pci_get_long(inj->aer_cap + PCI_ERR_UNCOR_MASK);
if (!(uncor_mask & uncor_status)) {
inj->log_overflow = !!pcie_aer_record_error(dev, inj->err);
}
pci_long_test_and_set_mask(inj->aer_cap + PCI_ERR_UNCOR_STATUS,
uncor_status);
}
}
if (inj->unsupported_request && !(inj->devctl & PCI_EXP_DEVCTL_URRE)) {
return false;
}
if (!(inj->devctl & PCI_EXP_DEVCTL_CERE)) {
return false;
}
inj->msg.severity = PCI_ERR_ROOT_CMD_COR_EN;
return true;
}
static bool pcie_aer_inject_uncor_error(PCIEAERInject *inj, bool is_fatal)
{
PCIDevice *dev = inj->dev;
uint16_t cmd;
if (is_fatal) {
inj->devsta |= PCI_EXP_DEVSTA_FED;
} else {
inj->devsta |= PCI_EXP_DEVSTA_NFED;
}
if (inj->unsupported_request) {
inj->devsta |= PCI_EXP_DEVSTA_URD;
}
pci_set_long(dev->config + dev->exp.exp_cap + PCI_EXP_DEVSTA, inj->devsta);
if (inj->aer_cap) {
uint32_t mask = pci_get_long(inj->aer_cap + PCI_ERR_UNCOR_MASK);
if (mask & inj->error_status) {
pci_long_test_and_set_mask(inj->aer_cap + PCI_ERR_UNCOR_STATUS,
inj->error_status);
return false;
}
inj->log_overflow = !!pcie_aer_record_error(dev, inj->err);
pci_long_test_and_set_mask(inj->aer_cap + PCI_ERR_UNCOR_STATUS,
inj->error_status);
}
cmd = pci_get_word(dev->config + PCI_COMMAND);
if (inj->unsupported_request &&
!(inj->devctl & PCI_EXP_DEVCTL_URRE) && !(cmd & PCI_COMMAND_SERR)) {
return false;
}
if (is_fatal) {
if (!((cmd & PCI_COMMAND_SERR) ||
(inj->devctl & PCI_EXP_DEVCTL_FERE))) {
return false;
}
inj->msg.severity = PCI_ERR_ROOT_CMD_FATAL_EN;
} else {
if (!((cmd & PCI_COMMAND_SERR) ||
(inj->devctl & PCI_EXP_DEVCTL_NFERE))) {
return false;
}
inj->msg.severity = PCI_ERR_ROOT_CMD_NONFATAL_EN;
}
return true;
}
/*
* non-Function specific error must be recorded in all functions.
* It is the responsibility of the caller of this function.
* It is also caller's responsibility to determine which function should
* report the error.
*
* 6.2.4 Error Logging
* 6.2.5 Sequence of Device Error Signaling and Logging Operations
* Figure 6-2: Flowchart Showing Sequence of Device Error Signaling and Logging
* Operations
*/
static int pcie_aer_inject_error(PCIDevice *dev, const PCIEAERErr *err)
{
uint8_t *aer_cap = NULL;
uint16_t devctl = 0;
uint16_t devsta = 0;
uint32_t error_status = err->status;
PCIEAERInject inj;
if (!pci_is_express(dev)) {
return -ENOSYS;
}
if (err->flags & PCIE_AER_ERR_IS_CORRECTABLE) {
error_status &= PCI_ERR_COR_SUPPORTED;
} else {
error_status &= PCI_ERR_UNC_SUPPORTED;
}
/* invalid status bit. one and only one bit must be set */
if (!error_status || (error_status & (error_status - 1))) {
return -EINVAL;
}
if (dev->exp.aer_cap) {
uint8_t *exp_cap = dev->config + dev->exp.exp_cap;
aer_cap = dev->config + dev->exp.aer_cap;
devctl = pci_get_long(exp_cap + PCI_EXP_DEVCTL);
devsta = pci_get_long(exp_cap + PCI_EXP_DEVSTA);
}
inj.dev = dev;
inj.aer_cap = aer_cap;
inj.err = err;
inj.devctl = devctl;
inj.devsta = devsta;
inj.error_status = error_status;
inj.unsupported_request = !(err->flags & PCIE_AER_ERR_IS_CORRECTABLE) &&
err->status == PCI_ERR_UNC_UNSUP;
inj.log_overflow = false;
if (err->flags & PCIE_AER_ERR_IS_CORRECTABLE) {
if (!pcie_aer_inject_cor_error(&inj, 0, false)) {
return 0;
}
} else {
bool is_fatal =
pcie_aer_uncor_default_severity(error_status) ==
PCI_ERR_ROOT_CMD_FATAL_EN;
if (aer_cap) {
is_fatal =
error_status & pci_get_long(aer_cap + PCI_ERR_UNCOR_SEVER);
}
if (!is_fatal && (err->flags & PCIE_AER_ERR_MAYBE_ADVISORY)) {
inj.error_status = PCI_ERR_COR_ADV_NONFATAL;
if (!pcie_aer_inject_cor_error(&inj, error_status, true)) {
return 0;
}
} else {
if (!pcie_aer_inject_uncor_error(&inj, is_fatal)) {
return 0;
}
}
}
/* send up error message */
inj.msg.source_id = err->source_id;
pcie_aer_msg(dev, &inj.msg);
if (inj.log_overflow) {
PCIEAERErr header_log_overflow = {
.status = PCI_ERR_COR_HL_OVERFLOW,
.flags = PCIE_AER_ERR_IS_CORRECTABLE,
};
int ret = pcie_aer_inject_error(dev, &header_log_overflow);
assert(!ret);
}
return 0;
}
void pcie_aer_write_config(PCIDevice *dev,
uint32_t addr, uint32_t val, int len)
{
uint8_t *aer_cap = dev->config + dev->exp.aer_cap;
uint32_t errcap = pci_get_long(aer_cap + PCI_ERR_CAP);
uint32_t first_error = 1U << PCI_ERR_CAP_FEP(errcap);
uint32_t uncorsta = pci_get_long(aer_cap + PCI_ERR_UNCOR_STATUS);
/* uncorrectable error */
if (!(uncorsta & first_error)) {
/* the bit that corresponds to the first error is cleared */
pcie_aer_clear_error(dev);
} else if (errcap & PCI_ERR_CAP_MHRE) {
/* When PCI_ERR_CAP_MHRE is enabled and the first error isn't cleared
* nothing should happen. So we have to revert the modification to
* the register.
*/
pcie_aer_update_uncor_status(dev);
} else {
/* capability & control
* PCI_ERR_CAP_MHRE might be cleared, so clear of header log.
*/
aer_log_clear_all_err(&dev->exp.aer_log);
}
}
void pcie_aer_root_init(PCIDevice *dev)
{
uint16_t pos = dev->exp.aer_cap;
pci_set_long(dev->wmask + pos + PCI_ERR_ROOT_COMMAND,
PCI_ERR_ROOT_CMD_EN_MASK);
pci_set_long(dev->w1cmask + pos + PCI_ERR_ROOT_STATUS,
PCI_ERR_ROOT_STATUS_REPORT_MASK);
/* PCI_ERR_ROOT_IRQ is RO but devices change it using a
* device-specific method.
*/
pci_set_long(dev->cmask + pos + PCI_ERR_ROOT_STATUS,
~PCI_ERR_ROOT_IRQ);
}
void pcie_aer_root_reset(PCIDevice *dev)
{
uint8_t* aer_cap = dev->config + dev->exp.aer_cap;
pci_set_long(aer_cap + PCI_ERR_ROOT_COMMAND, 0);
/*
* Advanced Error Interrupt Message Number in Root Error Status Register
* must be updated by chip dependent code because it's chip dependent
* which number is used.
*/
}
void pcie_aer_root_write_config(PCIDevice *dev,
uint32_t addr, uint32_t val, int len,
uint32_t root_cmd_prev)
{
uint8_t *aer_cap = dev->config + dev->exp.aer_cap;
uint32_t root_status = pci_get_long(aer_cap + PCI_ERR_ROOT_STATUS);
uint32_t enabled_cmd = pcie_aer_status_to_cmd(root_status);
uint32_t root_cmd = pci_get_long(aer_cap + PCI_ERR_ROOT_COMMAND);
/* 6.2.4.1.2 Interrupt Generation */
if (!msix_enabled(dev) && !msi_enabled(dev)) {
if (pci_intx(dev) != -1) {
pci_set_irq(dev, !!(root_cmd & enabled_cmd));
}
return;
}
if ((root_cmd_prev & enabled_cmd) || !(root_cmd & enabled_cmd)) {
/* Send MSI on transition from false to true. */
return;
}
pcie_aer_root_notify(dev);
}
static const VMStateDescription vmstate_pcie_aer_err = {
.name = "PCIE_AER_ERROR",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(status, PCIEAERErr),
VMSTATE_UINT16(source_id, PCIEAERErr),
VMSTATE_UINT16(flags, PCIEAERErr),
VMSTATE_UINT32_ARRAY(header, PCIEAERErr, 4),
VMSTATE_UINT32_ARRAY(prefix, PCIEAERErr, 4),
VMSTATE_END_OF_LIST()
}
};
static bool pcie_aer_state_log_num_valid(void *opaque, int version_id)
{
PCIEAERLog *s = opaque;
return s->log_num <= s->log_max;
}
const VMStateDescription vmstate_pcie_aer_log = {
.name = "PCIE_AER_ERROR_LOG",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT16(log_num, PCIEAERLog),
VMSTATE_UINT16_EQUAL(log_max, PCIEAERLog, NULL),
VMSTATE_VALIDATE("log_num <= log_max", pcie_aer_state_log_num_valid),
VMSTATE_STRUCT_VARRAY_POINTER_UINT16(log, PCIEAERLog, log_num,
vmstate_pcie_aer_err, PCIEAERErr),
VMSTATE_END_OF_LIST()
}
};
typedef struct PCIEAERErrorName {
const char *name;
uint32_t val;
bool correctable;
} PCIEAERErrorName;
/*
* AER error name -> value conversion table
* This naming scheme is same to linux aer-injection tool.
*/
static const struct PCIEAERErrorName pcie_aer_error_list[] = {
{
.name = "DLP",
.val = PCI_ERR_UNC_DLP,
.correctable = false,
}, {
.name = "SDN",
.val = PCI_ERR_UNC_SDN,
.correctable = false,
}, {
.name = "POISON_TLP",
.val = PCI_ERR_UNC_POISON_TLP,
.correctable = false,
}, {
.name = "FCP",
.val = PCI_ERR_UNC_FCP,
.correctable = false,
}, {
.name = "COMP_TIME",
.val = PCI_ERR_UNC_COMP_TIME,
.correctable = false,
}, {
.name = "COMP_ABORT",
.val = PCI_ERR_UNC_COMP_ABORT,
.correctable = false,
}, {
.name = "UNX_COMP",
.val = PCI_ERR_UNC_UNX_COMP,
.correctable = false,
}, {
.name = "RX_OVER",
.val = PCI_ERR_UNC_RX_OVER,
.correctable = false,
}, {
.name = "MALF_TLP",
.val = PCI_ERR_UNC_MALF_TLP,
.correctable = false,
}, {
.name = "ECRC",
.val = PCI_ERR_UNC_ECRC,
.correctable = false,
}, {
.name = "UNSUP",
.val = PCI_ERR_UNC_UNSUP,
.correctable = false,
}, {
.name = "ACSV",
.val = PCI_ERR_UNC_ACSV,
.correctable = false,
}, {
.name = "INTN",
.val = PCI_ERR_UNC_INTN,
.correctable = false,
}, {
.name = "MCBTLP",
.val = PCI_ERR_UNC_MCBTLP,
.correctable = false,
}, {
.name = "ATOP_EBLOCKED",
.val = PCI_ERR_UNC_ATOP_EBLOCKED,
.correctable = false,
}, {
.name = "TLP_PRF_BLOCKED",
.val = PCI_ERR_UNC_TLP_PRF_BLOCKED,
.correctable = false,
}, {
.name = "RCVR",
.val = PCI_ERR_COR_RCVR,
.correctable = true,
}, {
.name = "BAD_TLP",
.val = PCI_ERR_COR_BAD_TLP,
.correctable = true,
}, {
.name = "BAD_DLLP",
.val = PCI_ERR_COR_BAD_DLLP,
.correctable = true,
}, {
.name = "REP_ROLL",
.val = PCI_ERR_COR_REP_ROLL,
.correctable = true,
}, {
.name = "REP_TIMER",
.val = PCI_ERR_COR_REP_TIMER,
.correctable = true,
}, {
.name = "ADV_NONFATAL",
.val = PCI_ERR_COR_ADV_NONFATAL,
.correctable = true,
}, {
.name = "INTERNAL",
.val = PCI_ERR_COR_INTERNAL,
.correctable = true,
}, {
.name = "HL_OVERFLOW",
.val = PCI_ERR_COR_HL_OVERFLOW,
.correctable = true,
},
};
static int pcie_aer_parse_error_string(const char *error_name,
uint32_t *status, bool *correctable)
{
int i;
for (i = 0; i < ARRAY_SIZE(pcie_aer_error_list); i++) {
const PCIEAERErrorName *e = &pcie_aer_error_list[i];
if (strcmp(error_name, e->name)) {
continue;
}
*status = e->val;
*correctable = e->correctable;
return 0;
}
return -EINVAL;
}
/*
* Inject an error described by @qdict.
* On success, set @details to show where error was sent.
* Return negative errno if injection failed and a message was emitted.
*/
static int do_pcie_aer_inject_error(Monitor *mon,
const QDict *qdict,
PCIEErrorDetails *details)
{
const char *id = qdict_get_str(qdict, "id");
const char *error_name;
uint32_t error_status;
bool correctable;
PCIDevice *dev;
PCIEAERErr err;
int ret;
ret = pci_qdev_find_device(id, &dev);
if (ret < 0) {
monitor_printf(mon,
"id or pci device path is invalid or device not "
"found. %s\n", id);
return ret;
}
if (!pci_is_express(dev)) {
monitor_printf(mon, "the device doesn't support pci express. %s\n",
id);
return -ENOSYS;
}
error_name = qdict_get_str(qdict, "error_status");
if (pcie_aer_parse_error_string(error_name, &error_status, &correctable)) {
char *e = NULL;
error_status = strtoul(error_name, &e, 0);
correctable = qdict_get_try_bool(qdict, "correctable", false);
if (!e || *e != '\0') {
monitor_printf(mon, "invalid error status value. \"%s\"",
error_name);
return -EINVAL;
}
}
err.status = error_status;
err.source_id = pci_requester_id(dev);
err.flags = 0;
if (correctable) {
err.flags |= PCIE_AER_ERR_IS_CORRECTABLE;
}
if (qdict_get_try_bool(qdict, "advisory_non_fatal", false)) {
err.flags |= PCIE_AER_ERR_MAYBE_ADVISORY;
}
if (qdict_haskey(qdict, "header0")) {
err.flags |= PCIE_AER_ERR_HEADER_VALID;
}
if (qdict_haskey(qdict, "prefix0")) {
err.flags |= PCIE_AER_ERR_TLP_PREFIX_PRESENT;
}
err.header[0] = qdict_get_try_int(qdict, "header0", 0);
err.header[1] = qdict_get_try_int(qdict, "header1", 0);
err.header[2] = qdict_get_try_int(qdict, "header2", 0);
err.header[3] = qdict_get_try_int(qdict, "header3", 0);
err.prefix[0] = qdict_get_try_int(qdict, "prefix0", 0);
err.prefix[1] = qdict_get_try_int(qdict, "prefix1", 0);
err.prefix[2] = qdict_get_try_int(qdict, "prefix2", 0);
err.prefix[3] = qdict_get_try_int(qdict, "prefix3", 0);
ret = pcie_aer_inject_error(dev, &err);
if (ret < 0) {
monitor_printf(mon, "failed to inject error: %s\n",
strerror(-ret));
return ret;
}
details->id = id;
details->root_bus = pci_root_bus_path(dev);
details->bus = pci_dev_bus_num(dev);
details->devfn = dev->devfn;
return 0;
}
void hmp_pcie_aer_inject_error(Monitor *mon, const QDict *qdict)
{
PCIEErrorDetails data;
if (do_pcie_aer_inject_error(mon, qdict, &data) < 0) {
return;
}
monitor_printf(mon, "OK id: %s root bus: %s, bus: %x devfn: %x.%x\n",
data.id, data.root_bus, data.bus,
PCI_SLOT(data.devfn), PCI_FUNC(data.devfn));
}
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