When reporting an error, the AER driver prints the TLP Header / Prefix Log
only for errors enumerated in the AER_LOG_TLP_MASKS macro.
The macro was never amended since its introduction in 2006 with commit
6c2b374d7485 ("PCI-Express AER implemetation: AER core and aerdriver").
At the time, PCIe r1.1 was the latest spec revision.
Amend the macro with errors defined since then to avoid omitting the TLP
Header / Prefix Log for newer errors.
The order of the errors in AER_LOG_TLP_MASKS follows PCIe r1.1 sec 6.2.7
rather than 7.10.2, because only the former documents for which errors a
TLP Header / Prefix is logged. Retain this order. The section number is
still 6.2.7 in today's PCIe r7.0.
For Completion Timeouts, the TLP Header / Prefix is only logged if the
Completion Timeout Prefix / Header Log Capable bit is set in the AER
Capabilities and Control register. Introduce a tlp_header_logged() helper
to check whether the TLP Header / Prefix Log is populated and use it in
the two places which currently match against AER_LOG_TLP_MASKS directly.
For Uncorrectable Internal Errors, logging of the TLP Header / Prefix is
optional per PCIe r7.0 sec 6.2.7. If needed, drivers could indicate
through a flag whether devices are capable and tlp_header_logged() could
then check that flag.
pcitools introduced macros for newer errors with commit 144b0911cc0b
("ls-ecaps: extend decode support for more fields for AER CE and UE
status"):
https://git.kernel.org/pub/scm/utils/pciutils/pciutils.git/commit/?id=144b0911cc0b
Unfortunately some of those macros are overly long:
PCI_ERR_UNC_POISONED_TLP_EGRESS
PCI_ERR_UNC_DMWR_REQ_EGRESS_BLOCKED
PCI_ERR_UNC_IDE_CHECK
PCI_ERR_UNC_MISR_IDE_TLP
PCI_ERR_UNC_PCRC_CHECK
PCI_ERR_UNC_TLP_XLAT_EGRESS_BLOCKED
This seems unsuitable for <linux/pci_regs.h>, so shorten to:
PCI_ERR_UNC_POISON_BLK
PCI_ERR_UNC_DMWR_BLK
PCI_ERR_UNC_IDE_CHECK
PCI_ERR_UNC_MISR_IDE
PCI_ERR_UNC_PCRC_CHECK
PCI_ERR_UNC_XLAT_BLK
Note that some of the existing macros in <linux/pci_regs.h> do not match
exactly with pcitools (e.g. PCI_ERR_UNC_SDES versus PCI_ERR_UNC_SURPDN),
so it does not seem mandatory for them to be identical.
Signed-off-by: Lukas Wunner <[email protected]>
---
drivers/pci/pcie/aer.c | 30 +++++++++++++++++++++++++++---
include/uapi/linux/pci_regs.h | 8 ++++++++
2 files changed, 35 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 15ed541..62c74b5 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -96,11 +96,21 @@ struct aer_info {
};
#define AER_LOG_TLP_MASKS (PCI_ERR_UNC_POISON_TLP| \
+ PCI_ERR_UNC_POISON_BLK | \
PCI_ERR_UNC_ECRC| \
PCI_ERR_UNC_UNSUP| \
PCI_ERR_UNC_COMP_ABORT| \
PCI_ERR_UNC_UNX_COMP| \
- PCI_ERR_UNC_MALF_TLP)
+ PCI_ERR_UNC_ACSV | \
+ PCI_ERR_UNC_MCBTLP | \
+ PCI_ERR_UNC_ATOMEG | \
+ PCI_ERR_UNC_DMWR_BLK | \
+ PCI_ERR_UNC_XLAT_BLK | \
+ PCI_ERR_UNC_TLPPRE | \
+ PCI_ERR_UNC_MALF_TLP | \
+ PCI_ERR_UNC_IDE_CHECK | \
+ PCI_ERR_UNC_MISR_IDE | \
+ PCI_ERR_UNC_PCRC_CHECK)
#define SYSTEM_ERROR_INTR_ON_MESG_MASK (PCI_EXP_RTCTL_SECEE| \
PCI_EXP_RTCTL_SENFEE| \
@@ -796,6 +806,20 @@ static int aer_ratelimit(struct pci_dev *dev, unsigned int
severity)
}
}
+static bool tlp_header_logged(u32 status, u32 capctl)
+{
+ /* Errors for which a header is always logged (PCIe r7.0 sec 6.2.7) */
+ if (status & AER_LOG_TLP_MASKS)
+ return true;
+
+ /* Completion Timeout header is only logged on capable devices */
+ if (status & PCI_ERR_UNC_COMP_TIME &&
+ capctl & PCI_ERR_CAP_COMP_TIME_LOG)
+ return true;
+
+ return false;
+}
+
static void __aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
{
const char **strings;
@@ -910,7 +934,7 @@ void pci_print_aer(struct pci_dev *dev, int aer_severity,
status = aer->uncor_status;
mask = aer->uncor_mask;
info.level = KERN_ERR;
- tlp_header_valid = status & AER_LOG_TLP_MASKS;
+ tlp_header_valid = tlp_header_logged(status, aer->cap_control);
}
info.status = status;
@@ -1401,7 +1425,7 @@ int aer_get_device_error_info(struct aer_err_info *info,
int i)
pci_read_config_dword(dev, aer + PCI_ERR_CAP, &aercc);
info->first_error = PCI_ERR_CAP_FEP(aercc);
- if (info->status & AER_LOG_TLP_MASKS) {
+ if (tlp_header_logged(info->status, aercc)) {
info->tlp_header_valid = 1;
pcie_read_tlp_log(dev, aer + PCI_ERR_HEADER_LOG,
aer + PCI_ERR_PREFIX_LOG,
diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index f5b1774..d2e1bbb 100644
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -776,6 +776,13 @@
#define PCI_ERR_UNC_MCBTLP 0x00800000 /* MC blocked TLP */
#define PCI_ERR_UNC_ATOMEG 0x01000000 /* Atomic egress blocked */
#define PCI_ERR_UNC_TLPPRE 0x02000000 /* TLP prefix blocked */
+#define PCI_ERR_UNC_POISON_BLK 0x04000000 /* Poisoned TLP Egress
Blocked */
+#define PCI_ERR_UNC_DMWR_BLK 0x08000000 /* DMWr Request Egress Blocked
*/
+#define PCI_ERR_UNC_IDE_CHECK 0x10000000 /* IDE Check Failed */
+#define PCI_ERR_UNC_MISR_IDE 0x20000000 /* Misrouted IDE TLP */
+#define PCI_ERR_UNC_PCRC_CHECK 0x40000000 /* PCRC Check Failed */
+#define PCI_ERR_UNC_XLAT_BLK 0x80000000 /* TLP Translation Egress
Blocked */
+
#define PCI_ERR_UNCOR_MASK 0x08 /* Uncorrectable Error Mask */
/* Same bits as above */
#define PCI_ERR_UNCOR_SEVER 0x0c /* Uncorrectable Error Severity */
@@ -798,6 +805,7 @@
#define PCI_ERR_CAP_ECRC_CHKC 0x00000080 /* ECRC Check Capable */
#define PCI_ERR_CAP_ECRC_CHKE 0x00000100 /* ECRC Check Enable */
#define PCI_ERR_CAP_PREFIX_LOG_PRESENT 0x00000800 /* TLP Prefix Log
Present */
+#define PCI_ERR_CAP_COMP_TIME_LOG 0x00001000 /* Completion Timeout
Prefix/Header Log Capable */
#define PCI_ERR_CAP_TLP_LOG_FLIT 0x00040000 /* TLP was logged in Flit
Mode */
#define PCI_ERR_CAP_TLP_LOG_SIZE 0x00f80000 /* Logged TLP Size (only in
Flit mode) */
#define PCI_ERR_HEADER_LOG 0x1c /* Header Log Register (16 bytes) */
--
2.50.1
