Re: [PATCH v5 2/3] aerdrv: Enhanced AER logging

Borislav Petkov
2012-12-04T09:30:09Z

On Mon, Dec 03, 2012 at 02:20:54PM -0700, Lance Ortiz 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
> Signed-off-by: Lance Ortiz <lance.ortiz@hp.com>
> ---
>
> drivers/acpi/apei/cper.c | 19 ++++++++++++++++---
> drivers/pci/pcie/aer/aerdrv_errprint.c | 10 +++++++++-
> include/linux/aer.h | 2 +-
> 3 files changed, 26 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c
> index e6defd8..4a3e945 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_info("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(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..34d96e4 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>

Steve,

AFAIU, this will create all tracepoint code from the ras.h header
in this compilation unit, i.e. aerdrv_errprint.c. It has only one
tracepoint now but with time, as more RAS TPs are being added, it would
make sense to have that CREATE_TRACE_POINTS code at a more central place
in the kernel, right?

And, on configs with PCIEAER disabled, we won't have the TPs available
so the CREATE_TRACE_POINTS thing should be in a compilation unit which
gets included unconditionally, correct?

Thanks.

--
Regards/Gruss,
Boris.