linux-kernel - Re: [PATCH V2] PCI/AER: Configure ECRC only AER is native

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Message-ID: <20230112182522.GA1778254@bhelgaas>
Date:   Thu, 12 Jan 2023 12:25:22 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     bhelgaas@...gle.com, ruscur@...sell.cc, oohall@...il.com,
        treding@...dia.com, jonathanh@...dia.com, mmaddireddy@...dia.com,
        kthota@...dia.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, vsethi@...dia.com,
        linuxppc-dev@...ts.ozlabs.org, sagar.tv@...il.com
Subject: Re: [PATCH V2] PCI/AER: Configure ECRC only AER is native

On Thu, Jan 12, 2023 at 12:51:11PM +0530, Vidya Sagar wrote:
> As the ECRC configuration bits are part of AER registers, configure
> ECRC only if AER is natively owned by the kernel.
> 
> Signed-off-by: Vidya Sagar <vidyas@...dia.com>

Applied to pci/aer for v6.3, thanks!

> ---
> v2:
> * Updated kernel-parameters.txt document based on Bjorn's suggestion
> 
>  Documentation/admin-guide/kernel-parameters.txt | 4 +++-
>  drivers/pci/pcie/aer.c                          | 3 +++
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 426fa892d311..8f85a1230525 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -4242,7 +4242,9 @@
>  				specified, e.g., 12@pci:8086:9c22:103c:198f
>  				for 4096-byte alignment.
>  		ecrc=		Enable/disable PCIe ECRC (transaction layer
> -				end-to-end CRC checking).
> +				end-to-end CRC checking). Only effective if
> +				OS has native AER control (either granted by
> +				ACPI _OSC or forced via "pcie_ports=native")
>  				bios: Use BIOS/firmware settings. This is the
>  				the default.
>  				off: Turn ECRC off
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index e2d8a74f83c3..730b47bdcdef 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -184,6 +184,9 @@ static int disable_ecrc_checking(struct pci_dev *dev)
>   */
>  void pcie_set_ecrc_checking(struct pci_dev *dev)
>  {
> +	if (!pcie_aer_is_native(dev))
> +		return;
> +
>  	switch (ecrc_policy) {
>  	case ECRC_POLICY_DEFAULT:
>  		return;
> -- 
> 2.17.1
>