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linux/drivers/pci/pcie/aer/aerdrv_errprint.c
Zhang, Yanmin 6c2b374d74 PCI-Express AER implemetation: AER core and aerdriver 
Patch 3 implements the core part of PCI-Express AER and aerdrv
port service driver.

When a root port service device is probed, the aerdrv will call
request_irq to register irq handler for AER error interrupt.

When a device sends an PCI-Express error message to the root port,
the root port will trigger an interrupt, by either MSI or IO-APIC,
then kernel would run the irq handler. The handler collects root
error status register and schedules a work. The work will call
the core part to process the error based on its type
(Correctable/non-fatal/fatal).

As for Correctable errors, the patch chooses to just clear the correctable
error status register of the device.

As for the non-fatal error, the patch follows generic PCI error handler
rules to call the error callback functions of the endpoint's driver. If
the device is a bridge, the patch chooses to broadcast the error to
downstream devices.

As for the fatal error, the patch resets the pci-express link and
follows generic PCI error handler rules to call the error callback
functions of the endpoint's driver. If the device is a bridge, the patch
chooses to broadcast the error to downstream devices.

Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-09-26 17:43:53 -07:00

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/*
* drivers/pci/pcie/aer/aerdrv_errprint.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Format error messages and print them to console.
*
* Copyright (C) 2006 Intel Corp.
* Tom Long Nguyen (tom.l.nguyen@intel.com)
* Zhang Yanmin (yanmin.zhang@intel.com)
*
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/suspend.h>
#include "aerdrv.h"
#define AER_AGENT_RECEIVER 0
#define AER_AGENT_REQUESTER 1
#define AER_AGENT_COMPLETER 2
#define AER_AGENT_TRANSMITTER 3
#define AER_AGENT_REQUESTER_MASK (PCI_ERR_UNC_COMP_TIME| \
PCI_ERR_UNC_UNSUP)
#define AER_AGENT_COMPLETER_MASK PCI_ERR_UNC_COMP_ABORT
#define AER_AGENT_TRANSMITTER_MASK(t, e) (e & (PCI_ERR_COR_REP_ROLL| \
((t == AER_CORRECTABLE) ? PCI_ERR_COR_REP_TIMER: 0)))
#define AER_GET_AGENT(t, e) \
((e & AER_AGENT_COMPLETER_MASK) ? AER_AGENT_COMPLETER : \
(e & AER_AGENT_REQUESTER_MASK) ? AER_AGENT_REQUESTER : \
(AER_AGENT_TRANSMITTER_MASK(t, e)) ? AER_AGENT_TRANSMITTER : \
AER_AGENT_RECEIVER)
#define AER_PHYSICAL_LAYER_ERROR_MASK PCI_ERR_COR_RCVR
#define AER_DATA_LINK_LAYER_ERROR_MASK(t, e) \
(PCI_ERR_UNC_DLP| \
PCI_ERR_COR_BAD_TLP| \
PCI_ERR_COR_BAD_DLLP| \
PCI_ERR_COR_REP_ROLL| \
((t == AER_CORRECTABLE) ? \
PCI_ERR_COR_REP_TIMER: 0))
#define AER_PHYSICAL_LAYER_ERROR 0
#define AER_DATA_LINK_LAYER_ERROR 1
#define AER_TRANSACTION_LAYER_ERROR 2
#define AER_GET_LAYER_ERROR(t, e) \
((e & AER_PHYSICAL_LAYER_ERROR_MASK) ? \
AER_PHYSICAL_LAYER_ERROR : \
(e & AER_DATA_LINK_LAYER_ERROR_MASK(t, e)) ? \
AER_DATA_LINK_LAYER_ERROR : \
AER_TRANSACTION_LAYER_ERROR)
/*
* AER error strings
*/
static char* aer_error_severity_string[] = {
"Uncorrected (Non-Fatal)",
"Uncorrected (Fatal)",
"Corrected"
};
static char* aer_error_layer[] = {
"Physical Layer",
"Data Link Layer",
"Transaction Layer"
};
static char* aer_correctable_error_string[] = {
"Receiver Error ", /* Bit Position 0 */
NULL,
NULL,
NULL,
NULL,
NULL,
"Bad TLP ", /* Bit Position 6 */
"Bad DLLP ", /* Bit Position 7 */
"RELAY_NUM Rollover ", /* Bit Position 8 */
NULL,
NULL,
NULL,
"Replay Timer Timeout ", /* Bit Position 12 */
"Advisory Non-Fatal ", /* Bit Position 13 */
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
};
static char* aer_uncorrectable_error_string[] = {
NULL,
NULL,
NULL,
NULL,
"Data Link Protocol ", /* Bit Position 4 */
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
"Poisoned TLP ", /* Bit Position 12 */
"Flow Control Protocol ", /* Bit Position 13 */
"Completion Timeout ", /* Bit Position 14 */
"Completer Abort ", /* Bit Position 15 */
"Unexpected Completion ", /* Bit Position 16 */
"Receiver Overflow ", /* Bit Position 17 */
"Malformed TLP ", /* Bit Position 18 */
"ECRC ", /* Bit Position 19 */
"Unsupported Request ", /* Bit Position 20 */
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
};
static char* aer_agent_string[] = {
"Receiver ID",
"Requester ID",
"Completer ID",
"Transmitter ID"
};
static char * aer_get_error_source_name(int severity,
unsigned int status,
char errmsg_buff[])
{
int i;
char * errmsg = NULL;
for (i = 0; i < 32; i++) {
if (!(status & (1 << i)))
continue;
if (severity == AER_CORRECTABLE)
errmsg = aer_correctable_error_string[i];
else
errmsg = aer_uncorrectable_error_string[i];
if (!errmsg) {
sprintf(errmsg_buff, "Unknown Error Bit %2d ", i);
errmsg = errmsg_buff;
}
break;
}
return errmsg;
}
static DEFINE_SPINLOCK(logbuf_lock);
static char errmsg_buff[100];
void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
{
char * errmsg;
int err_layer, agent;
char * loglevel;
if (info->severity == AER_CORRECTABLE)
loglevel = KERN_WARNING;
else
loglevel = KERN_ERR;
printk("%s+------ PCI-Express Device Error ------+\n", loglevel);
printk("%sError Severity\t\t: %s\n", loglevel,
aer_error_severity_string[info->severity]);
if ( info->status == 0) {
printk("%sPCIE Bus Error type\t: (Unaccessible)\n", loglevel);
printk("%sUnaccessible Received\t: %s\n", loglevel,
info->flags & AER_MULTI_ERROR_VALID_FLAG ?
"Multiple" : "First");
printk("%sUnregistered Agent ID\t: %04x\n", loglevel,
(dev->bus->number << 8) | dev->devfn);
} else {
err_layer = AER_GET_LAYER_ERROR(info->severity, info->status);
printk("%sPCIE Bus Error type\t: %s\n", loglevel,
aer_error_layer[err_layer]);
spin_lock(&logbuf_lock);
errmsg = aer_get_error_source_name(info->severity,
info->status,
errmsg_buff);
printk("%s%s\t: %s\n", loglevel, errmsg,
info->flags & AER_MULTI_ERROR_VALID_FLAG ?
"Multiple" : "First");
spin_unlock(&logbuf_lock);
agent = AER_GET_AGENT(info->severity, info->status);
printk("%s%s\t\t: %04x\n", loglevel,
aer_agent_string[agent],
(dev->bus->number << 8) | dev->devfn);
printk("%sVendorID=%04xh, DeviceID=%04xh,"
" Bus=%02xh, Device=%02xh, Function=%02xh\n",
loglevel,
dev->vendor,
dev->device,
dev->bus->number,
PCI_SLOT(dev->devfn),
PCI_FUNC(dev->devfn));
if (info->flags & AER_TLP_HEADER_VALID_FLAG) {
unsigned char *tlp = (unsigned char *) &info->tlp;
printk("%sTLB Header:\n", loglevel);
printk("%s%02x%02x%02x%02x %02x%02x%02x%02x"
" %02x%02x%02x%02x %02x%02x%02x%02x\n",
loglevel,
*(tlp + 3), *(tlp + 2), *(tlp + 1), *tlp,
*(tlp + 7), *(tlp + 6), *(tlp + 5), *(tlp + 4),
*(tlp + 11), *(tlp + 10), *(tlp + 9),
*(tlp + 8), *(tlp + 15), *(tlp + 14),
*(tlp + 13), *(tlp + 12));
}
}
}
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