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Subject[PATCH v3 2/5] PCI/AER: Add sysfs stats for AER capable devices
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Add the following AER sysfs stats to represent the counters for each
kind of error as seen by the device:

dev_total_cor_errs
dev_total_fatal_errs
dev_total_nonfatal_errs

Signed-off-by: Rajat Jain <rajatja@google.com>
---
v3: Merge everything in aer.c, use "%llu" in place of "%llx"

drivers/pci/pci-sysfs.c | 3 ++
drivers/pci/pci.h | 4 ++-
drivers/pci/pcie/aer.c | 74 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 80 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 0c4653c1d2ce..9f1cb9051d7d 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1746,6 +1746,9 @@ static const struct attribute_group *pci_dev_attr_groups[] = {
#endif
&pci_bridge_attr_group,
&pcie_dev_attr_group,
+#ifdef CONFIG_PCIEAER
+ &aer_stats_attr_group,
+#endif
NULL,
};

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index c358e7a07f3f..9a28ec600225 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -181,7 +181,9 @@ extern const struct attribute_group *pci_dev_groups[];
extern const struct attribute_group *pcibus_groups[];
extern const struct device_type pci_dev_type;
extern const struct attribute_group *pci_bus_groups[];
-
+#ifdef CONFIG_PCIEAER
+extern const struct attribute_group aer_stats_attr_group;
+#endif

/**
* pci_match_one_device - Tell if a PCI device structure has a matching
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index f9fa994b6c33..ce0d675d7bd3 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -573,6 +573,79 @@ static const char *aer_agent_string[] = {
"Transmitter ID"
};

+#define aer_stats_aggregate_attr(field) \
+ static ssize_t \
+ field##_show(struct device *dev, struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct pci_dev *pdev = to_pci_dev(dev); \
+ return sprintf(buf, "%llu\n", pdev->aer_stats->field); \
+} \
+static DEVICE_ATTR_RO(field)
+
+aer_stats_aggregate_attr(dev_total_cor_errs);
+aer_stats_aggregate_attr(dev_total_fatal_errs);
+aer_stats_aggregate_attr(dev_total_nonfatal_errs);
+
+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,
+ NULL
+};
+
+static umode_t aer_stats_attrs_are_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ if (!pdev->aer_stats)
+ return 0;
+
+ return a->mode;
+}
+
+const struct attribute_group aer_stats_attr_group = {
+ .name = "aer_stats",
+ .attrs = aer_stats_attrs,
+ .is_visible = aer_stats_attrs_are_visible,
+};
+
+static void pci_dev_aer_stats_incr(struct pci_dev *pdev,
+ struct aer_err_info *info)
+{
+ int status, i, max = -1;
+ u64 *counter = NULL;
+ struct aer_stats *aer_stats = pdev->aer_stats;
+
+ if (!aer_stats)
+ return;
+
+ switch (info->severity) {
+ case AER_CORRECTABLE:
+ aer_stats->dev_total_cor_errs++;
+ counter = &aer_stats->dev_cor_errs[0];
+ max = AER_MAX_TYPEOF_CORRECTABLE_ERRS;
+ break;
+ case AER_NONFATAL:
+ aer_stats->dev_total_nonfatal_errs++;
+ counter = &aer_stats->dev_uncor_errs[0];
+ max = AER_MAX_TYPEOF_UNCORRECTABLE_ERRS;
+ break;
+ case AER_FATAL:
+ aer_stats->dev_total_fatal_errs++;
+ counter = &aer_stats->dev_uncor_errs[0];
+ max = AER_MAX_TYPEOF_UNCORRECTABLE_ERRS;
+ break;
+ }
+
+ status = (info->status & ~info->mask);
+ for (i = 0; i < max; i++)
+ if (status & (1 << i))
+ counter[i]++;
+}
+
static void __print_tlp_header(struct pci_dev *dev,
struct aer_header_log_regs *t)
{
@@ -605,6 +678,7 @@ static void __aer_print_error(struct pci_dev *dev,
pci_err(dev, " [%2d] Unknown Error Bit%s\n",
i, info->first_error == i ? " (First)" : "");
}
+ pci_dev_aer_stats_incr(dev, info);
}

static void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
--
2.18.0.rc1.244.gcf134e6275-goog
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