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Subject[PATCH v4 1/5] PCI/AER: Define and allocate aer_stats structure for AER capable devices
From
Define a structure to hold the AER statistics. There are 2 groups
of statistics: dev_* counters that are to be collected for all AER
capable devices and rootport_* counters that are collected for all
(AER capable) rootports only. Allocate and free this structure when
device is added or released (thus counters survive the lifetime of the
device).

Signed-off-by: Rajat Jain <rajatja@google.com>
---
v4: Same as v3
v3: Merge everything in aer.c

drivers/pci/pcie/aer.c | 60 ++++++++++++++++++++++++++++++++++++++++++
drivers/pci/probe.c | 1 +
include/linux/pci.h | 3 +++
3 files changed, 64 insertions(+)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index a2e88386af28..f9fa994b6c33 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -33,6 +33,9 @@
#define AER_ERROR_SOURCES_MAX 100
#define AER_MAX_MULTI_ERR_DEVICES 5 /* Not likely to have more */

+#define AER_MAX_TYPEOF_CORRECTABLE_ERRS 16 /* as per PCI_ERR_COR_STATUS */
+#define AER_MAX_TYPEOF_UNCORRECTABLE_ERRS 26 /* as per PCI_ERR_UNCOR_STATUS*/
+
struct aer_err_info {
struct pci_dev *dev[AER_MAX_MULTI_ERR_DEVICES];
int error_dev_num;
@@ -76,6 +79,40 @@ struct aer_rpc {
*/
};

+/* AER stats for the device */
+struct aer_stats {
+
+ /*
+ * Fields for all AER capable devices. They indicate the errors
+ * "as seen by this device". Note that this may mean that if an
+ * end point is causing problems, the AER counters may increment
+ * at its link partner (e.g. root port) because the errors will be
+ * "seen" by the link partner and not the the problematic end point
+ * itself (which may report all counters as 0 as it never saw any
+ * problems).
+ */
+ /* Individual counters for different type of correctable errors */
+ u64 dev_cor_errs[AER_MAX_TYPEOF_CORRECTABLE_ERRS];
+ /* Individual counters for different type of uncorrectable errors */
+ u64 dev_uncor_errs[AER_MAX_TYPEOF_UNCORRECTABLE_ERRS];
+ /* Total number of correctable errors seen by this device */
+ u64 dev_total_cor_errs;
+ /* Total number of fatal uncorrectable errors seen by this device */
+ u64 dev_total_fatal_errs;
+ /* Total number of fatal uncorrectable errors seen by this device */
+ u64 dev_total_nonfatal_errs;
+
+ /*
+ * Fields for Root ports only, these indicate the total number of
+ * ERR_COR, ERR_FATAL, and ERR_NONFATAL messages received by the
+ * rootport, INCLUDING the ones that are generated internally (by
+ * the rootport itself)
+ */
+ u64 rootport_total_cor_errs;
+ u64 rootport_total_fatal_errs;
+ u64 rootport_total_nonfatal_errs;
+};
+
#define AER_LOG_TLP_MASKS (PCI_ERR_UNC_POISON_TLP| \
PCI_ERR_UNC_ECRC| \
PCI_ERR_UNC_UNSUP| \
@@ -402,12 +439,35 @@ int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
return 0;
}

+static int pci_aer_stats_init(struct pci_dev *pdev)
+{
+ pdev->aer_stats = kzalloc(sizeof(struct aer_stats), GFP_KERNEL);
+ if (!pdev->aer_stats) {
+ dev_err(&pdev->dev, "No memory for aer_stats\n");
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static void pci_aer_stats_exit(struct pci_dev *pdev)
+{
+ kfree(pdev->aer_stats);
+ pdev->aer_stats = NULL;
+}
+
int pci_aer_init(struct pci_dev *dev)
{
dev->aer_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
+ if (!dev->aer_cap || pci_aer_stats_init(dev))
+ return -EIO;
return pci_cleanup_aer_error_status_regs(dev);
}

+void pci_aer_exit(struct pci_dev *dev)
+{
+ pci_aer_stats_exit(dev);
+}
+
#define AER_AGENT_RECEIVER 0
#define AER_AGENT_REQUESTER 1
#define AER_AGENT_COMPLETER 2
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ac876e32de4b..48edd0c9e4bc 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2064,6 +2064,7 @@ static void pci_configure_device(struct pci_dev *dev)

static void pci_release_capabilities(struct pci_dev *dev)
{
+ pci_aer_exit(dev);
pci_vpd_release(dev);
pci_iov_release(dev);
pci_free_cap_save_buffers(dev);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 340029b2fb38..8d59c6c19a19 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -299,6 +299,7 @@ struct pci_dev {
u8 hdr_type; /* PCI header type (`multi' flag masked out) */
#ifdef CONFIG_PCIEAER
u16 aer_cap; /* AER capability offset */
+ struct aer_stats *aer_stats; /* AER stats for this device */
#endif
u8 pcie_cap; /* PCIe capability offset */
u8 msi_cap; /* MSI capability offset */
@@ -1471,10 +1472,12 @@ static inline bool pcie_aspm_support_enabled(void) { return false; }
void pci_no_aer(void);
bool pci_aer_available(void);
int pci_aer_init(struct pci_dev *dev);
+void pci_aer_exit(struct pci_dev *dev);
#else
static inline void pci_no_aer(void) { }
static inline bool pci_aer_available(void) { return false; }
static inline int pci_aer_init(struct pci_dev *d) { return -ENODEV; }
+static inline void pci_aer_exit(struct pci_dev *d) { }
#endif

#ifdef CONFIG_PCIE_ECRC
--
2.18.0.rc1.244.gcf134e6275-goog
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