From: "Kuppuswamy, Sathyanarayanan" <sathyanarayanan.kuppuswamy@linux.intel.com>
To: bhelgaas@google.com
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
ashok.raj@intel.com
Subject: Re: [PATCH v17 09/12] PCI/AER: Allow clearing Error Status Register in FF mode
Date: Thu, 5 Mar 2020 21:45:46 -0800 [thread overview]
Message-ID: <9e4a1632-9425-9fb6-fd1a-d7cee4e9b684@linux.intel.com> (raw)
In-Reply-To: <29fb514a0d86e9bcc75cec4ea8474cd4db33adbf.1583286655.git.sathyanarayanan.kuppuswamy@linux.intel.com>
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
next prev parent reply other threads:[~2020-03-06 5:45 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-04 2:36 [PATCH v17 00/12] Add Error Disconnect Recover (EDR) support sathyanarayanan.kuppuswamy
2020-03-04 2:36 ` [PATCH v17 01/12] PCI/ERR: Update error status after reset_link() sathyanarayanan.kuppuswamy
2020-03-04 2:36 ` [PATCH v17 02/12] PCI/AER: Move pci_cleanup_aer_error_status_regs() declaration to pci.h sathyanarayanan.kuppuswamy
2020-03-04 2:36 ` [PATCH v17 03/12] PCI/ERR: Remove service dependency in pcie_do_recovery() sathyanarayanan.kuppuswamy
2020-03-17 14:40 ` Christoph Hellwig
2020-03-04 2:36 ` [PATCH v17 04/12] PCI: portdrv: remove unnecessary pcie_port_find_service() sathyanarayanan.kuppuswamy
2020-03-04 2:36 ` [PATCH v17 05/12] PCI: portdrv: remove reset_link member from pcie_port_service_driver sathyanarayanan.kuppuswamy
2020-03-17 14:41 ` Christoph Hellwig
2020-03-17 14:55 ` Kuppuswamy, Sathyanarayanan
2020-03-04 2:36 ` [PATCH v17 06/12] Documentation: PCI: Remove reset_link references sathyanarayanan.kuppuswamy
2020-03-17 14:42 ` Christoph Hellwig
2020-03-17 15:05 ` Kuppuswamy, Sathyanarayanan
2020-03-17 15:07 ` Christoph Hellwig
2020-03-17 16:03 ` Bjorn Helgaas
2020-03-17 17:06 ` Christoph Hellwig
2020-03-19 22:52 ` Bjorn Helgaas
2020-03-04 2:36 ` [PATCH v17 07/12] PCI/ERR: Return status of pcie_do_recovery() sathyanarayanan.kuppuswamy
2020-03-04 2:36 ` [PATCH v17 08/12] PCI/DPC: Cache DPC capabilities in pci_init_capabilities() sathyanarayanan.kuppuswamy
2020-03-04 2:36 ` [PATCH v17 09/12] PCI/AER: Allow clearing Error Status Register in FF mode sathyanarayanan.kuppuswamy
2020-03-06 5:45 ` Kuppuswamy, Sathyanarayanan [this message]
2020-03-06 16:04 ` Bjorn Helgaas
2020-03-06 16:11 ` Kuppuswamy, Sathyanarayanan
2020-03-06 16:41 ` Bjorn Helgaas
2020-03-10 2:40 ` Bjorn Helgaas
2020-03-10 4:28 ` Kuppuswamy, Sathyanarayanan
2020-03-10 18:14 ` Austin.Bolen
2020-03-10 19:32 ` Bjorn Helgaas
2020-03-10 20:06 ` Austin.Bolen
2020-03-10 20:41 ` Kuppuswamy Sathyanarayanan
2020-03-10 20:49 ` Austin.Bolen
2020-03-11 14:45 ` Bjorn Helgaas
2020-03-11 15:19 ` Austin.Bolen
2020-03-11 17:12 ` Bjorn Helgaas
2020-03-11 17:27 ` Austin.Bolen
2020-03-11 20:33 ` Bjorn Helgaas
2020-03-11 21:25 ` Kuppuswamy Sathyanarayanan
2020-03-11 21:53 ` Austin.Bolen
2020-03-11 22:11 ` Kuppuswamy Sathyanarayanan
2020-03-11 22:23 ` Bjorn Helgaas
2020-03-11 23:07 ` Kuppuswamy Sathyanarayanan
2020-03-12 19:53 ` Bjorn Helgaas
2020-03-12 21:02 ` Austin.Bolen
2020-03-12 21:29 ` Kuppuswamy Sathyanarayanan
2020-03-12 21:52 ` Bjorn Helgaas
2020-03-12 22:02 ` Kuppuswamy Sathyanarayanan
2020-03-12 22:36 ` Bjorn Helgaas
2020-03-12 21:59 ` Kuppuswamy Sathyanarayanan
2020-03-12 22:32 ` Bjorn Helgaas
2020-03-13 6:22 ` Kuppuswamy, Sathyanarayanan
2020-03-13 19:28 ` Bjorn Helgaas
2020-03-13 20:26 ` Kuppuswamy Sathyanarayanan
2020-03-19 23:03 ` Bjorn Helgaas
2020-03-19 23:20 ` Kuppuswamy, Sathyanarayanan
2020-03-11 22:13 ` Bjorn Helgaas
2020-03-11 22:41 ` Kuppuswamy Sathyanarayanan
2020-03-11 18:12 ` Kuppuswamy Sathyanarayanan
2020-03-11 22:05 ` Bjorn Helgaas
2020-03-04 2:36 ` [PATCH v17 10/12] PCI/DPC: Export DPC error recovery functions sathyanarayanan.kuppuswamy
2020-03-17 14:43 ` Christoph Hellwig
2020-03-04 2:36 ` [PATCH v17 11/12] PCI/DPC: Add Error Disconnect Recover (EDR) support sathyanarayanan.kuppuswamy
2020-03-06 3:47 ` Bjorn Helgaas
2020-03-06 6:32 ` Kuppuswamy, Sathyanarayanan
2020-03-06 21:00 ` Bjorn Helgaas
2020-03-06 22:42 ` Kuppuswamy Sathyanarayanan
2020-03-06 23:23 ` Bjorn Helgaas
2020-03-07 0:19 ` Kuppuswamy Sathyanarayanan
2020-03-04 2:36 ` [PATCH v17 12/12] PCI/ACPI: Enable EDR support sathyanarayanan.kuppuswamy
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