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Subject[PATCH v2 3/5] PCI/AER: Add sysfs attributes to provide breakdown of AERs
Date
Add sysfs attributes to provide breakdown of the AERs seen,
into different type of correctable or uncorrectable errors:

dev_breakdown_correctable
dev_breakdown_uncorrectable

Signed-off-by: Rajat Jain <rajatj@google.com>
---
v2: Use tabs instead of spaces, fix the subject, and print
all non zero counters.

drivers/pci/pcie/aer/aerdrv.h | 6 ++++++
drivers/pci/pcie/aer/aerdrv_errprint.c | 6 ++++--
drivers/pci/pcie/aer/aerdrv_stats.c | 28 ++++++++++++++++++++++++++
3 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pcie/aer/aerdrv.h b/drivers/pci/pcie/aer/aerdrv.h
index b5d5ad6f2c03..048fbd7c9633 100644
--- a/drivers/pci/pcie/aer/aerdrv.h
+++ b/drivers/pci/pcie/aer/aerdrv.h
@@ -89,6 +89,12 @@ int pci_aer_stats_init(struct pci_dev *pdev);
void pci_aer_stats_exit(struct pci_dev *pdev);
void pci_dev_aer_stats_incr(struct pci_dev *pdev, struct aer_err_info *info);

+extern const char
+*aer_correctable_error_string[AER_MAX_TYPEOF_CORRECTABLE_ERRS];
+
+extern const char
+*aer_uncorrectable_error_string[AER_MAX_TYPEOF_UNCORRECTABLE_ERRS];
+
#ifdef CONFIG_ACPI_APEI
int pcie_aer_get_firmware_first(struct pci_dev *pci_dev);
#else
diff --git a/drivers/pci/pcie/aer/aerdrv_errprint.c b/drivers/pci/pcie/aer/aerdrv_errprint.c
index 5e8b98deda08..5585f309f1a8 100644
--- a/drivers/pci/pcie/aer/aerdrv_errprint.c
+++ b/drivers/pci/pcie/aer/aerdrv_errprint.c
@@ -68,7 +68,8 @@ static const char *aer_error_layer[] = {
"Transaction Layer"
};

-static const char *aer_correctable_error_string[] = {
+const char
+*aer_correctable_error_string[AER_MAX_TYPEOF_CORRECTABLE_ERRS] = {
"Receiver Error", /* Bit Position 0 */
NULL,
NULL,
@@ -87,7 +88,8 @@ static const char *aer_correctable_error_string[] = {
"Header Log Overflow", /* Bit Position 15 */
};

-static const char *aer_uncorrectable_error_string[] = {
+const char
+*aer_uncorrectable_error_string[AER_MAX_TYPEOF_UNCORRECTABLE_ERRS] = {
"Undefined", /* Bit Position 0 */
NULL,
NULL,
diff --git a/drivers/pci/pcie/aer/aerdrv_stats.c b/drivers/pci/pcie/aer/aerdrv_stats.c
index 5555beffef2b..e47321b267f6 100644
--- a/drivers/pci/pcie/aer/aerdrv_stats.c
+++ b/drivers/pci/pcie/aer/aerdrv_stats.c
@@ -58,10 +58,38 @@ aer_stats_aggregate_attr(dev_total_cor_errs);
aer_stats_aggregate_attr(dev_total_fatal_errs);
aer_stats_aggregate_attr(dev_total_nonfatal_errs);

+#define aer_stats_breakdown_attr(field, stats_array, strings_array) \
+ static ssize_t \
+ field##_show(struct device *dev, struct device_attribute *attr, \
+ char *buf) \
+{ \
+ unsigned int i; \
+ char *str = buf; \
+ struct pci_dev *pdev = to_pci_dev(dev); \
+ u64 *stats = pdev->aer_stats->stats_array; \
+ for (i = 0; i < ARRAY_SIZE(strings_array); i++) { \
+ if (strings_array[i]) \
+ str += sprintf(str, "%s = 0x%llx\n", \
+ strings_array[i], stats[i]); \
+ else if (stats[i]) \
+ str += sprintf(str, #stats_array "bit[%d] = 0x%llx\n",\
+ i, stats[i]); \
+ } \
+ return str-buf; \
+} \
+static DEVICE_ATTR_RO(field)
+
+aer_stats_breakdown_attr(dev_breakdown_correctable, dev_cor_errs,
+ aer_correctable_error_string);
+aer_stats_breakdown_attr(dev_breakdown_uncorrectable, dev_uncor_errs,
+ aer_uncorrectable_error_string);
+
static struct attribute *aer_stats_attrs[] __ro_after_init = {
&dev_attr_dev_total_cor_errs.attr,
&dev_attr_dev_total_fatal_errs.attr,
&dev_attr_dev_total_nonfatal_errs.attr,
+ &dev_attr_dev_breakdown_correctable.attr,
+ &dev_attr_dev_breakdown_uncorrectable.attr,
NULL
};

--
2.17.0.441.gb46fe60e1d-goog
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