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pcie/aer: helper functions for pcie aer capability

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This patch implements helper functions for pcie aer capability
which will be used later.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Isaku Yamahata 2010-11-16 17:26:09 +09:00 committed by Michael S. Tsirkin
parent 1a1ea6f093
commit 34e65944c0
5 changed files with 951 additions and 1 deletions
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2
Makefile.objs
View file

@ -207,7 +207,7 @@ hw-obj-$(CONFIG_PIIX4) += piix4.o
# PCI watchdog devices
hw-obj-y += wdt_i6300esb.o
hw-obj-y += pcie.o pcie_port.o
hw-obj-y += pcie.o pcie_aer.o pcie_port.o
hw-obj-y += msix.o msi.o
# PCI network cards

14
hw/pcie.h
View file

@ -24,6 +24,7 @@
#include "hw.h"
#include "pci_regs.h"
#include "pcie_regs.h"
#include "pcie_aer.h"
typedef enum {
/* for attention and power indicator */
@ -79,6 +80,19 @@ struct PCIExpressDevice {
Software Notification of Hot-Plug Events, an interrupt
is sent whenever the logical and of these conditions
transitions from false to true. */
/* AER */
uint16_t aer_cap;
PCIEAERLog aer_log;
unsigned int aer_intx; /* INTx for error reporting
* default is 0 = INTA#
* If the chip wants to use other interrupt
* line, initialize this member with the
* desired number.
* If the chip dynamically changes this member,
* also initialize it when loaded as
* appropreately.
*/
};
/* PCI express capability helper functions */

827
hw/pcie_aer.c Normal file
View file

@ -0,0 +1,827 @@
/*
* 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 "sysemu.h"
#include "pci_bridge.h"
#include "pcie.h"
#include "msix.h"
#include "msi.h"
#include "pci_internals.h"
#include "pcie_regs.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__)
/* 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, uint16_t offset)
{
PCIExpressDevice *exp;
pcie_add_capability(dev, PCI_EXT_CAP_ID_ERR, PCI_ERR_VER,
offset, PCI_ERR_SIZEOF);
exp = &dev->exp;
exp->aer_cap = offset;
/* log_max is property */
if (dev->exp.aer_log.log_max == PCIE_AER_LOG_MAX_UNSET) {
dev->exp.aer_log.log_max = PCIE_AER_LOG_MAX_DEFAULT;
}
/* clip down the value to avoid unreasobale memory usage */
if (dev->exp.aer_log.log_max > PCIE_AER_LOG_MAX_LIMIT) {
return -EINVAL;
}
dev->exp.aer_log.log = qemu_mallocz(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_STATUS);
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)
{
qemu_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);
}
}
/*
* pcie_aer_msg() is called recursively by
* pcie_aer_msg_alldev(), pci_aer_msg_vbridge() and pcie_aer_msg_root_port()
*/
static void pcie_aer_msg(PCIDevice *dev, const PCIEAERMsg *msg);
/*
* return value:
* true: error message is 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)
{
PCIDevice *parent_port;
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 */
if (pci_is_express(dev) &&
pcie_cap_get_type(dev) == PCI_EXP_TYPE_ROOT_PORT) {
/* Root port notify system itself,
or send the error message to root complex event collector. */
/*
* if root port is associated to event collector, set
* parent_port = root complex event collector
* For now root complex event collector isn't supported.
*/
parent_port = NULL;
} else {
parent_port = pci_bridge_get_device(dev->bus);
}
if (parent_port) {
if (!pci_is_express(parent_port)) {
/* just ignore it */
return false;
}
pcie_aer_msg(parent_port, msg);
}
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;
}
/*
* return value:
* true: error message is sent up
* false: error message is masked
*
* 6.2.6 Error Message Control
* Figure 6-3
* root port part
*/
static bool pcie_aer_msg_root_port(PCIDevice *dev, const PCIEAERMsg *msg)
{
bool msg_sent;
uint16_t cmd;
uint8_t *aer_cap;
uint32_t root_cmd;
uint32_t root_status;
bool msi_trigger;
msg_sent = false;
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);
root_status = pci_get_long(aer_cap + PCI_ERR_ROOT_STATUS);
msi_trigger = false;
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 {
if (root_cmd & PCI_ERR_ROOT_CMD_COR_EN) {
msi_trigger = true;
}
pci_set_word(aer_cap + PCI_ERR_ROOT_COR_SRC, msg->source_id);
}
root_status |= PCI_ERR_ROOT_COR_RCV;
break;
case PCI_ERR_ROOT_CMD_NONFATAL_EN:
if (!(root_status & PCI_ERR_ROOT_NONFATAL_RCV) &&
root_cmd & PCI_ERR_ROOT_CMD_NONFATAL_EN) {
msi_trigger = true;
}
root_status |= PCI_ERR_ROOT_NONFATAL_RCV;
break;
case PCI_ERR_ROOT_CMD_FATAL_EN:
if (!(root_status & PCI_ERR_ROOT_FATAL_RCV) &&
root_cmd & PCI_ERR_ROOT_CMD_FATAL_EN) {
msi_trigger = true;
}
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_SRC, msg->source_id);
}
root_status |= PCI_ERR_ROOT_UNCOR_RCV;
}
pci_set_long(aer_cap + PCI_ERR_ROOT_STATUS, root_status);
if (root_cmd & msg->severity) {
/* 6.2.4.1.2 Interrupt Generation */
if (pci_msi_enabled(dev)) {
if (msi_trigger) {
pci_msi_notify(dev, pcie_aer_root_get_vector(dev));
}
} else {
qemu_set_irq(dev->irq[dev->exp.aer_intx], 1);
}
msg_sent = true;
}
return msg_sent;
}
/*
* 6.2.6 Error Message Control Figure 6-3
*/
static void pcie_aer_msg(PCIDevice *dev, const PCIEAERMsg *msg)
{
uint8_t type;
bool msg_sent;
assert(pci_is_express(dev));
type = pcie_cap_get_type(dev);
if (type == PCI_EXP_TYPE_ROOT_PORT ||
type == PCI_EXP_TYPE_UPSTREAM ||
type == PCI_EXP_TYPE_DOWNSTREAM) {
msg_sent = pcie_aer_msg_vbridge(dev, msg);
if (!msg_sent) {
return;
}
}
msg_sent = pcie_aer_msg_alldev(dev, msg);
if (type == PCI_EXP_TYPE_ROOT_PORT && msg_sent) {
pcie_aer_msg_root_port(dev, msg);
}
}
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 = ffsl(err->status) - 1;
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];
cpu_to_be32wu((uint32_t*)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_DEVCTL2) &
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];
cpu_to_be32wu((uint32_t*)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 responsiblity to determine which function should
* report the rerror.
*
* 6.2.4 Error Logging
* 6.2.5 Sqeunce of Device Error Signaling and Logging Operations
* table 6-2: Flowchard Showing Sequence of Device Error Signaling and Logging
* Operations
*/
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);
}
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.
*/
}
static bool pcie_aer_root_does_trigger(uint32_t cmd, uint32_t status)
{
return
((cmd & PCI_ERR_ROOT_CMD_COR_EN) && (status & PCI_ERR_ROOT_COR_RCV)) ||
((cmd & PCI_ERR_ROOT_CMD_NONFATAL_EN) &&
(status & PCI_ERR_ROOT_NONFATAL_RCV)) ||
((cmd & PCI_ERR_ROOT_CMD_FATAL_EN) &&
(status & PCI_ERR_ROOT_FATAL_RCV));
}
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;
/* root command register */
uint32_t root_cmd = pci_get_long(aer_cap + PCI_ERR_ROOT_COMMAND);
if (root_cmd & PCI_ERR_ROOT_CMD_EN_MASK) {
/* 6.2.4.1.2 Interrupt Generation */
/* 0 -> 1 */
uint32_t root_cmd_set = (root_cmd_prev ^ root_cmd) & root_cmd;
uint32_t root_status = pci_get_long(aer_cap + PCI_ERR_ROOT_STATUS);
if (pci_msi_enabled(dev)) {
if (pcie_aer_root_does_trigger(root_cmd_set, root_status)) {
pci_msi_notify(dev, pcie_aer_root_get_vector(dev));
}
} else {
int int_level = pcie_aer_root_does_trigger(root_cmd, root_status);
qemu_set_irq(dev->irq[dev->exp.aer_intx], int_level);
}
}
}
static const VMStateDescription vmstate_pcie_aer_err = {
.name = "PCIE_AER_ERROR",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 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()
}
};
#define VMSTATE_PCIE_AER_ERRS(_field, _state, _field_num, _vmsd, _type) { \
.name = (stringify(_field)), \
.version_id = 0, \
.num_offset = vmstate_offset_value(_state, _field_num, uint16_t), \
.size = sizeof(_type), \
.vmsd = &(_vmsd), \
.flags = VMS_POINTER | VMS_VARRAY_UINT16 | VMS_STRUCT, \
.offset = vmstate_offset_pointer(_state, _field, _type), \
}
const VMStateDescription vmstate_pcie_aer_log = {
.name = "PCIE_AER_ERROR_LOG",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT16(log_num, PCIEAERLog),
VMSTATE_UINT16(log_max, PCIEAERLog),
VMSTATE_PCIE_AER_ERRS(log, PCIEAERLog, log_num,
vmstate_pcie_aer_err, PCIEAERErr),
VMSTATE_END_OF_LIST()
}
};

106
hw/pcie_aer.h Normal file
View file

@ -0,0 +1,106 @@
/*
* pcie_aer.h
*
* 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/>.
*/
#ifndef QEMU_PCIE_AER_H
#define QEMU_PCIE_AER_H
#include "hw.h"
/* definitions which PCIExpressDevice uses */
/* AER log */
struct PCIEAERLog {
/* This structure is saved/loaded.
So explicitly size them instead of unsigned int */
/* the number of currently recorded log in log member */
uint16_t log_num;
/*
* The maximum number of the log. Errors can be logged up to this.
*
* This is configurable property.
* The specified value will be clipped down to PCIE_AER_LOG_MAX_LIMIT
* to avoid unreasonable memory usage.
* I bet that 128 log size would be big enough, otherwise too many errors
* for system to function normaly. But could consecutive errors occur?
*/
#define PCIE_AER_LOG_MAX_DEFAULT 8
#define PCIE_AER_LOG_MAX_LIMIT 128
#define PCIE_AER_LOG_MAX_UNSET 0xffff
uint16_t log_max;
/* Error log. log_max-sized array */
PCIEAERErr *log;
};
/* aer error message: error signaling message has only error sevirity and
source id. See 2.2.8.3 error signaling messages */
struct PCIEAERMsg {
/*
* PCI_ERR_ROOT_CMD_{COR, NONFATAL, FATAL}_EN
* = PCI_EXP_DEVCTL_{CERE, NFERE, FERE}
*/
uint32_t severity;
uint16_t source_id; /* bdf */
};
static inline bool
pcie_aer_msg_is_uncor(const PCIEAERMsg *msg)
{
return msg->severity == PCI_ERR_ROOT_CMD_NONFATAL_EN ||
msg->severity == PCI_ERR_ROOT_CMD_FATAL_EN;
}
/* error */
struct PCIEAERErr {
uint32_t status; /* error status bits */
uint16_t source_id; /* bdf */
#define PCIE_AER_ERR_IS_CORRECTABLE 0x1 /* correctable/uncorrectable */
#define PCIE_AER_ERR_MAYBE_ADVISORY 0x2 /* maybe advisory non-fatal */
#define PCIE_AER_ERR_HEADER_VALID 0x4 /* TLP header is logged */
#define PCIE_AER_ERR_TLP_PREFIX_PRESENT 0x8 /* TLP Prefix is logged */
uint16_t flags;
uint32_t header[4]; /* TLP header */
uint32_t prefix[4]; /* TLP header prefix */
};
extern const VMStateDescription vmstate_pcie_aer_log;
int pcie_aer_init(PCIDevice *dev, uint16_t offset);
void pcie_aer_exit(PCIDevice *dev);
void pcie_aer_write_config(PCIDevice *dev,
uint32_t addr, uint32_t val, int len);
/* aer root port */
void pcie_aer_root_set_vector(PCIDevice *dev, unsigned int vector);
void pcie_aer_root_init(PCIDevice *dev);
void pcie_aer_root_reset(PCIDevice *dev);
void pcie_aer_root_write_config(PCIDevice *dev,
uint32_t addr, uint32_t val, int len,
uint32_t root_cmd_prev);
/* error injection */
int pcie_aer_inject_error(PCIDevice *dev, const PCIEAERErr *err);
#endif /* QEMU_PCIE_AER_H */

3
qemu-common.h
View file

@ -240,6 +240,9 @@ typedef struct PCIBus PCIBus;
typedef struct PCIDevice PCIDevice;
typedef struct PCIExpressDevice PCIExpressDevice;
typedef struct PCIBridge PCIBridge;
typedef struct PCIEAERMsg PCIEAERMsg;
typedef struct PCIEAERLog PCIEAERLog;
typedef struct PCIEAERErr PCIEAERErr;
typedef struct PCIEPort PCIEPort;
typedef struct PCIESlot PCIESlot;
typedef struct SerialState SerialState;