PCI/AER: Define aer_stats structure for AER capable devices

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>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 52bc5b3..1877a14 100644 (file)
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -483,9 +483,11 @@ static inline int devm_of_pci_get_host_bridge_resources(struct device *dev,
 #ifdef CONFIG_PCIEAER
 void pci_no_aer(void);
 void 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 int pci_aer_init(struct pci_dev *d) { return -ENODEV; }
+static inline void pci_aer_exit(struct pci_dev *d) { }
 #endif
 
 #endif /* DRIVERS_PCI_H */

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 0c6fe22..fe1b9d2 100644 (file)
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -32,6 +32,9 @@
 
 #define AER_ERROR_SOURCES_MAX          100
 
+#define AER_MAX_TYPEOF_COR_ERRS                16      /* as per PCI_ERR_COR_STATUS */
+#define AER_MAX_TYPEOF_UNCOR_ERRS      26      /* as per PCI_ERR_UNCOR_STATUS*/
+
 struct aer_err_source {
        unsigned int status;
        unsigned int id;
@@ -56,6 +59,42 @@ 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).
+        */
+       /* Counters for different type of correctable errors */
+       u64 dev_cor_errs[AER_MAX_TYPEOF_COR_ERRS];
+       /* Counters for different type of fatal uncorrectable errors */
+       u64 dev_fatal_errs[AER_MAX_TYPEOF_UNCOR_ERRS];
+       /* Counters for different type of nonfatal uncorrectable errors */
+       u64 dev_nonfatal_errs[AER_MAX_TYPEOF_UNCOR_ERRS];
+       /* Total number of ERR_COR sent by this device */
+       u64 dev_total_cor_errs;
+       /* Total number of ERR_FATAL sent by this device */
+       u64 dev_total_fatal_errs;
+       /* Total number of ERR_NONFATAL sent by this device */
+       u64 dev_total_nonfatal_errs;
+
+       /*
+        * Fields for Root ports & root complex event collectors only, these
+        * indicate the total number of ERR_COR, ERR_FATAL, and ERR_NONFATAL
+        * messages received by the root port / event collector, 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|              \
@@ -385,9 +424,19 @@ int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
 void pci_aer_init(struct pci_dev *dev)
 {
        dev->aer_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
+
+       if (dev->aer_cap)
+               dev->aer_stats = kzalloc(sizeof(struct aer_stats), GFP_KERNEL);
+
        pci_cleanup_aer_error_status_regs(dev);
 }
 
+void pci_aer_exit(struct pci_dev *dev)
+{
+       kfree(dev->aer_stats);
+       dev->aer_stats = NULL;
+}
+
 #define AER_AGENT_RECEIVER             0
 #define AER_AGENT_REQUESTER            1
 #define AER_AGENT_COMPLETER            2
@@ -438,7 +487,7 @@ static const char *aer_error_layer[] = {
        "Transaction Layer"
 };
 
-static const char *aer_correctable_error_string[] = {
+static const char *aer_correctable_error_string[AER_MAX_TYPEOF_COR_ERRS] = {
        "RxErr",                        /* Bit Position 0       */
        NULL,
        NULL,
@@ -457,7 +506,7 @@ static const char *aer_correctable_error_string[] = {
        "HeaderOF",                     /* Bit Position 15      */
 };
 
-static const char *aer_uncorrectable_error_string[] = {
+static const char *aer_uncorrectable_error_string[AER_MAX_TYPEOF_UNCOR_ERRS] = {
        "Undefined",                    /* Bit Position 0       */
        NULL,
        NULL,

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ac876e3..48edd0c 100644 (file)
--- 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 b4ffea0..6bc0aa0 100644 (file)
--- 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 */