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PCI/AER: Add sysfs attributes to provide AER stats and breakdown
Add sysfs attributes to provide total and breakdown of the AERs seen, into different type of correctable, fatal and nonfatal errors: /sys/bus/pci/devices/<dev>/aer_dev_correctable /sys/bus/pci/devices/<dev>/aer_dev_fatal /sys/bus/pci/devices/<dev>/aer_dev_nonfatal Signed-off-by: Rajat Jain <rajatja@google.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Rajat Jain
Bjorn Helgaas
parent
db89ccbe52
commit
81aa5206f9
94
Documentation/ABI/testing/sysfs-bus-pci-devices-aer_stats
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94
Documentation/ABI/testing/sysfs-bus-pci-devices-aer_stats
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@ -0,0 +1,94 @@
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==========================
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PCIe Device AER statistics
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==========================
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These attributes show up under all the devices that are AER capable. These
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statistical counters indicate the errors "as seen/reported by the device".
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Note that this may mean that if an endpoint is causing problems, the AER
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counters may increment at its link partner (e.g. root port) because the
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errors may be "seen" / reported by the link partner and not the
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problematic endpoint itself (which may report all counters as 0 as it never
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saw any problems).
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Where: /sys/bus/pci/devices/<dev>/aer_dev_correctable
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Date: July 2018
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Kernel Version: 4.19.0
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Contact: linux-pci@vger.kernel.org, rajatja@google.com
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Description: List of correctable errors seen and reported by this
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PCI device using ERR_COR. Note that since multiple errors may
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be reported using a single ERR_COR message, thus
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TOTAL_ERR_COR at the end of the file may not match the actual
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total of all the errors in the file. Sample output:
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-------------------------------------------------------------------------
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localhost /sys/devices/pci0000:00/0000:00:1c.0 # cat aer_dev_correctable
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Receiver Error 2
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Bad TLP 0
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Bad DLLP 0
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RELAY_NUM Rollover 0
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Replay Timer Timeout 0
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Advisory Non-Fatal 0
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Corrected Internal Error 0
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Header Log Overflow 0
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TOTAL_ERR_COR 2
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-------------------------------------------------------------------------
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Where: /sys/bus/pci/devices/<dev>/aer_dev_fatal
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Date: July 2018
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Kernel Version: 4.19.0
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Contact: linux-pci@vger.kernel.org, rajatja@google.com
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Description: List of uncorrectable fatal errors seen and reported by this
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PCI device using ERR_FATAL. Note that since multiple errors may
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be reported using a single ERR_FATAL message, thus
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TOTAL_ERR_FATAL at the end of the file may not match the actual
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total of all the errors in the file. Sample output:
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-------------------------------------------------------------------------
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localhost /sys/devices/pci0000:00/0000:00:1c.0 # cat aer_dev_fatal
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Undefined 0
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Data Link Protocol 0
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Surprise Down Error 0
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Poisoned TLP 0
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Flow Control Protocol 0
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Completion Timeout 0
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Completer Abort 0
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Unexpected Completion 0
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Receiver Overflow 0
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Malformed TLP 0
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ECRC 0
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Unsupported Request 0
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ACS Violation 0
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Uncorrectable Internal Error 0
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MC Blocked TLP 0
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AtomicOp Egress Blocked 0
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TLP Prefix Blocked Error 0
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TOTAL_ERR_FATAL 0
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-------------------------------------------------------------------------
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Where: /sys/bus/pci/devices/<dev>/aer_dev_nonfatal
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Date: July 2018
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Kernel Version: 4.19.0
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Contact: linux-pci@vger.kernel.org, rajatja@google.com
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Description: List of uncorrectable nonfatal errors seen and reported by this
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PCI device using ERR_NONFATAL. Note that since multiple errors
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may be reported using a single ERR_FATAL message, thus
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TOTAL_ERR_NONFATAL at the end of the file may not match the
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actual total of all the errors in the file. Sample output:
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-------------------------------------------------------------------------
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localhost /sys/devices/pci0000:00/0000:00:1c.0 # cat aer_dev_nonfatal
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Undefined 0
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Data Link Protocol 0
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Surprise Down Error 0
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Poisoned TLP 0
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Flow Control Protocol 0
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Completion Timeout 0
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Completer Abort 0
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Unexpected Completion 0
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Receiver Overflow 0
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Malformed TLP 0
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ECRC 0
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Unsupported Request 0
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ACS Violation 0
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Uncorrectable Internal Error 0
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MC Blocked TLP 0
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AtomicOp Egress Blocked 0
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TLP Prefix Blocked Error 0
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TOTAL_ERR_NONFATAL 0
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-------------------------------------------------------------------------
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@ -73,6 +73,11 @@ In the example, 'Requester ID' means the ID of the device who sends
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the error message to root port. Pls. refer to pci express specs for
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other fields.
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2.4 AER Statistics / Counters
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When PCIe AER errors are captured, the counters / statistics are also exposed
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in the form of sysfs attributes which are documented at
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Documentation/ABI/testing/sysfs-bus-pci-devices-aer_stats
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3. Developer Guide
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@ -1746,6 +1746,9 @@ static const struct attribute_group *pci_dev_attr_groups[] = {
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#endif
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&pci_bridge_attr_group,
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&pcie_dev_attr_group,
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#ifdef CONFIG_PCIEAER
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&aer_stats_attr_group,
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#endif
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NULL,
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};
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@ -484,6 +484,7 @@ static inline int devm_of_pci_get_host_bridge_resources(struct device *dev,
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void pci_no_aer(void);
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void pci_aer_init(struct pci_dev *dev);
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void pci_aer_exit(struct pci_dev *dev);
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extern const struct attribute_group aer_stats_attr_group;
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#else
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static inline void pci_no_aer(void) { }
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static inline int pci_aer_init(struct pci_dev *d) { return -ENODEV; }
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@ -542,6 +542,99 @@ static const char *aer_agent_string[] = {
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"Transmitter ID"
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};
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#define aer_stats_dev_attr(name, stats_array, strings_array, \
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total_string, total_field) \
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static ssize_t \
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name##_show(struct device *dev, struct device_attribute *attr, \
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char *buf) \
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{ \
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unsigned int i; \
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char *str = buf; \
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struct pci_dev *pdev = to_pci_dev(dev); \
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u64 *stats = pdev->aer_stats->stats_array; \
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\
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for (i = 0; i < ARRAY_SIZE(strings_array); i++) { \
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if (strings_array[i]) \
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str += sprintf(str, "%s %llu\n", \
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strings_array[i], stats[i]); \
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else if (stats[i]) \
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str += sprintf(str, #stats_array "_bit[%d] %llu\n",\
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i, stats[i]); \
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} \
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str += sprintf(str, "TOTAL_%s %llu\n", total_string, \
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pdev->aer_stats->total_field); \
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return str-buf; \
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} \
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static DEVICE_ATTR_RO(name)
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aer_stats_dev_attr(aer_dev_correctable, dev_cor_errs,
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aer_correctable_error_string, "ERR_COR",
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dev_total_cor_errs);
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aer_stats_dev_attr(aer_dev_fatal, dev_fatal_errs,
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aer_uncorrectable_error_string, "ERR_FATAL",
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dev_total_fatal_errs);
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aer_stats_dev_attr(aer_dev_nonfatal, dev_nonfatal_errs,
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aer_uncorrectable_error_string, "ERR_NONFATAL",
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dev_total_nonfatal_errs);
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static struct attribute *aer_stats_attrs[] __ro_after_init = {
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&dev_attr_aer_dev_correctable.attr,
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&dev_attr_aer_dev_fatal.attr,
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&dev_attr_aer_dev_nonfatal.attr,
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NULL
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};
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static umode_t aer_stats_attrs_are_visible(struct kobject *kobj,
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struct attribute *a, int n)
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{
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struct device *dev = kobj_to_dev(kobj);
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struct pci_dev *pdev = to_pci_dev(dev);
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if (!pdev->aer_stats)
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return 0;
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return a->mode;
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}
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const struct attribute_group aer_stats_attr_group = {
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.attrs = aer_stats_attrs,
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.is_visible = aer_stats_attrs_are_visible,
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};
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static void pci_dev_aer_stats_incr(struct pci_dev *pdev,
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struct aer_err_info *info)
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{
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int status, i, max = -1;
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u64 *counter = NULL;
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struct aer_stats *aer_stats = pdev->aer_stats;
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if (!aer_stats)
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return;
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switch (info->severity) {
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case AER_CORRECTABLE:
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aer_stats->dev_total_cor_errs++;
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counter = &aer_stats->dev_cor_errs[0];
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max = AER_MAX_TYPEOF_COR_ERRS;
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break;
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case AER_NONFATAL:
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aer_stats->dev_total_nonfatal_errs++;
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counter = &aer_stats->dev_nonfatal_errs[0];
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max = AER_MAX_TYPEOF_UNCOR_ERRS;
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break;
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case AER_FATAL:
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aer_stats->dev_total_fatal_errs++;
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counter = &aer_stats->dev_fatal_errs[0];
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max = AER_MAX_TYPEOF_UNCOR_ERRS;
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break;
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}
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status = (info->status & ~info->mask);
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for (i = 0; i < max; i++)
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if (status & (1 << i))
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counter[i]++;
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}
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static void __print_tlp_header(struct pci_dev *dev,
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struct aer_header_log_regs *t)
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{
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@ -574,6 +667,7 @@ static void __aer_print_error(struct pci_dev *dev,
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pci_err(dev, " [%2d] Unknown Error Bit%s\n",
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i, info->first_error == i ? " (First)" : "");
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}
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pci_dev_aer_stats_incr(dev, info);
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}
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void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
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