[v9,2/3] aerdrv: Enhanced AER logging

This patch will provide a more reliable and easy way for user-space
applications to have access to AER logs rather than reading them from the
message buffer. It also provides a way to notify user-space when an AER
event occurs.

The aer driver is updated to generate a trace event of function 'aer_event'
when a PCIe error is reported over the AER interface.  The trace event was
added to both the interrupt based aer path and the firmware first path.

v1-v2 fix compile errors in ifdefs.
v2-v3 Update to new location of trace header. Update print to remove
warning.
v3-v4 Reworked logic when getting ready to call cper_print_aer
v6-v7 Change print from pr_info to pr_err if !dev
v7-v8 Add pfx argument back into call to cper_print_aer()

Signed-off-by: Lance Ortiz <lance.ortiz@hp.com>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Tony Luck <tony.luck@intel.com>
---

 drivers/acpi/apei/cper.c               |   19 ++++++++++++++++---
 drivers/pci/pcie/aer/aerdrv_errprint.c |    9 ++++++++-
 include/linux/aer.h                    |    4 ++--
 3 files changed, 26 insertions(+), 6 deletions(-)


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On Thu, Jan 3, 2013 at 3:34 PM, Lance Ortiz <lance.ortiz@hp.com> wrote:
> This patch will provide a more reliable and easy way for user-space
> applications to have access to AER logs rather than reading them from the
> message buffer. It also provides a way to notify user-space when an AER
> event occurs.
>
> The aer driver is updated to generate a trace event of function 'aer_event'
> when a PCIe error is reported over the AER interface.  The trace event was
> added to both the interrupt based aer path and the firmware first path.
>
> v1-v2 fix compile errors in ifdefs.
> v2-v3 Update to new location of trace header. Update print to remove
> warning.
> v3-v4 Reworked logic when getting ready to call cper_print_aer
> v6-v7 Change print from pr_info to pr_err if !dev
> v7-v8 Add pfx argument back into call to cper_print_aer()
>
> Signed-off-by: Lance Ortiz <lance.ortiz@hp.com>
> Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
> Acked-by: Tony Luck <tony.luck@intel.com>

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

> ---
>
>  drivers/acpi/apei/cper.c               |   19 ++++++++++++++++---
>  drivers/pci/pcie/aer/aerdrv_errprint.c |    9 ++++++++-
>  include/linux/aer.h                    |    4 ++--
>  3 files changed, 26 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c
> index e6defd8..1e5d8a4 100644
> --- a/drivers/acpi/apei/cper.c
> +++ b/drivers/acpi/apei/cper.c
> @@ -29,6 +29,7 @@
>  #include <linux/time.h>
>  #include <linux/cper.h>
>  #include <linux/acpi.h>
> +#include <linux/pci.h>
>  #include <linux/aer.h>
>
>  /*
> @@ -249,6 +250,10 @@ static const char *cper_pcie_port_type_strs[] = {
>  static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
>                             const struct acpi_hest_generic_data *gdata)
>  {
> +#ifdef CONFIG_ACPI_APEI_PCIEAER
> +       struct pci_dev *dev;
> +#endif
> +
>         if (pcie->validation_bits & CPER_PCIE_VALID_PORT_TYPE)
>                 printk("%s""port_type: %d, %s\n", pfx, pcie->port_type,
>                        pcie->port_type < ARRAY_SIZE(cper_pcie_port_type_strs) ?
> @@ -281,10 +286,18 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
>         "%s""bridge: secondary_status: 0x%04x, control: 0x%04x\n",
>         pfx, pcie->bridge.secondary_status, pcie->bridge.control);
>  #ifdef CONFIG_ACPI_APEI_PCIEAER
> -       if (pcie->validation_bits & CPER_PCIE_VALID_AER_INFO) {
> -               struct aer_capability_regs *aer_regs = (void *)pcie->aer_info;
> -               cper_print_aer(pfx, gdata->error_severity, aer_regs);
> +       dev = pci_get_domain_bus_and_slot(pcie->device_id.segment,
> +                       pcie->device_id.bus, pcie->device_id.function);
> +       if (!dev) {
> +               pr_err("PCI AER Cannot get PCI device %04x:%02x:%02x.%d\n",
> +                       pcie->device_id.segment, pcie->device_id.bus,
> +                       pcie->device_id.slot, pcie->device_id.function);
> +               return;
>         }
> +       if (pcie->validation_bits & CPER_PCIE_VALID_AER_INFO)
> +               cper_print_aer(pfx, dev, gdata->error_severity,
> +                               (struct aer_capability_regs *) pcie->aer_info);
> +       pci_dev_put(dev);
>  #endif
>  }
>
> diff --git a/drivers/pci/pcie/aer/aerdrv_errprint.c b/drivers/pci/pcie/aer/aerdrv_errprint.c
> index 3ea5173..d3e5fc5 100644
> --- a/drivers/pci/pcie/aer/aerdrv_errprint.c
> +++ b/drivers/pci/pcie/aer/aerdrv_errprint.c
> @@ -23,6 +23,9 @@
>
>  #include "aerdrv.h"
>
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/ras.h>
> +
>  #define AER_AGENT_RECEIVER             0
>  #define AER_AGENT_REQUESTER            1
>  #define AER_AGENT_COMPLETER            2
> @@ -194,6 +197,8 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
>         if (info->id && info->error_dev_num > 1 && info->id == id)
>                 printk("%s""  Error of this Agent(%04x) is reported first\n",
>                         prefix, id);
> +       trace_aer_event(dev_name(&dev->dev), (info->status & ~info->mask),
> +                       info->severity);
>  }
>
>  void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info)
> @@ -217,7 +222,7 @@ int cper_severity_to_aer(int cper_severity)
>  }
>  EXPORT_SYMBOL_GPL(cper_severity_to_aer);
>
> -void cper_print_aer(const char *prefix, int cper_severity,
> +void cper_print_aer(const char *prefix, struct pci_dev *dev, int cper_severity,
>                     struct aer_capability_regs *aer)
>  {
>         int aer_severity, layer, agent, status_strs_size, tlp_header_valid = 0;
> @@ -259,5 +264,7 @@ void cper_print_aer(const char *prefix, int cper_severity,
>                         *(tlp + 8), *(tlp + 15), *(tlp + 14),
>                         *(tlp + 13), *(tlp + 12));
>         }
> +       trace_aer_event(dev_name(&dev->dev), (status & ~mask),
> +                       aer_severity);
>  }
>  #endif
> diff --git a/include/linux/aer.h b/include/linux/aer.h
> index 544abdb..ec10e1b 100644
> --- a/include/linux/aer.h
> +++ b/include/linux/aer.h
> @@ -49,8 +49,8 @@ static inline int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
>  }
>  #endif
>
> -extern void cper_print_aer(const char *prefix, int cper_severity,
> -                          struct aer_capability_regs *aer);
> +extern void cper_print_aer(const char *prefix, struct pci_dev *dev,
> +                          int cper_severity, struct aer_capability_regs *aer);
>  extern int cper_severity_to_aer(int cper_severity);
>  extern void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
>                               int severity);
>
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