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SubjectRe: [PATCH v17 09/12] PCI/AER: Allow clearing Error Status Register in FF mode
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On 3/3/2020 6:36 PM, sathyanarayanan.kuppuswamy@linux.intel.com wrote:
> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>
> As per PCI firmware specification r3.2 System Firmware Intermediary
> (SFI) _OSC and DPC Updates ECR
> (https://members.pcisig.com/wg/PCI-SIG/document/13563), sec titled "DPC
> Event Handling Implementation Note", page 10, Error Disconnect Recover
> (EDR) support allows OS to handle error recovery and clearing Error
> Registers even in FF mode. So create new API pci_aer_raw_clear_status()
> which allows clearing AER registers without FF mode checks.
>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> ---
> drivers/pci/pci.h | 2 ++
> drivers/pci/pcie/aer.c | 22 ++++++++++++++++++----
> 2 files changed, 20 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index e57e78b619f8..c239e6dd2542 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -655,6 +655,7 @@ extern const struct attribute_group aer_stats_attr_group;
> void pci_aer_clear_fatal_status(struct pci_dev *dev);
> void pci_aer_clear_device_status(struct pci_dev *dev);
> int pci_cleanup_aer_error_status_regs(struct pci_dev *dev);
> +int pci_aer_raw_clear_status(struct pci_dev *dev);
> #else
> static inline void pci_no_aer(void) { }
> static inline void pci_aer_init(struct pci_dev *d) { }
> @@ -665,6 +666,7 @@ static inline int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
> {
> return -EINVAL;
> }
> +int pci_aer_raw_clear_status(struct pci_dev *dev) { return -EINVAL; }
Its missing static specifier. It needs to be fixed. I can fix it in next
version.
Bjorn, if there is no need for next version, can you please make this
change ?
> #endif
>
> #ifdef CONFIG_ACPI
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index c0540c3761dc..41afefa562b7 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -420,7 +420,16 @@ void pci_aer_clear_fatal_status(struct pci_dev *dev)
> pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
> }
>
> -int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
> +/**
> + * pci_aer_raw_clear_status - Clear AER error registers.
> + * @dev: the PCI device
> + *
> + * NOTE: Allows clearing error registers in both FF and
> + * non FF modes.
> + *
> + * Returns 0 on success, or negative on failure.
> + */
> +int pci_aer_raw_clear_status(struct pci_dev *dev)
> {
> int pos;
> u32 status;
> @@ -433,9 +442,6 @@ int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
> if (!pos)
> return -EIO;
>
> - if (pcie_aer_get_firmware_first(dev))
> - return -EIO;
> -
> port_type = pci_pcie_type(dev);
> if (port_type == PCI_EXP_TYPE_ROOT_PORT) {
> pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &status);
> @@ -451,6 +457,14 @@ int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
> return 0;
> }
>
> +int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
> +{
> + if (pcie_aer_get_firmware_first(dev))
> + return -EIO;
> +
> + return pci_aer_raw_clear_status(dev);
> +}
> +
> void pci_save_aer_state(struct pci_dev *dev)
> {
> struct pci_cap_saved_state *save_state;
>

--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer

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