linux-kernel - Re: [PATCH] PCI: Add ACS quirk for Cavium multi-function devices

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Date:   Tue, 10 Aug 2021 09:47:35 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     George Cherian <george.cherian@...vell.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        bhelgaas@...gle.com
Subject: Re: [PATCH] PCI: Add ACS quirk for Cavium multi-function devices

On Tue, Aug 10, 2021 at 05:54:25PM +0530, George Cherian wrote:
> Some Cavium endpoints are implemented as multi-function devices
> without ACS capability, but they actually don't support peer-to-peer
> transactions.
> 
> Add ACS quirks to declare DMA isolation.
> 
> Apply te quirk for following devices
> 1. BGX device found on Octeon-TX (8xxx)
> 2. CGX device found on Octeon-TX2 (9xxx)
> 3. RPM device found on Octeon-TX3 (10xxx)
> 
> Signed-off-by: George Cherian <george.cherian@...vell.com>
> ---
>  drivers/pci/quirks.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 6d74386eadc2..076932018494 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -4840,6 +4840,10 @@ static const struct pci_dev_acs_enabled {
>  	{ 0x10df, 0x720, pci_quirk_mf_endpoint_acs }, /* Emulex Skyhawk-R */
>  	/* Cavium ThunderX */
>  	{ PCI_VENDOR_ID_CAVIUM, PCI_ANY_ID, pci_quirk_cavium_acs },
> +	/* Cavium multi-function devices */
> +	{ PCI_VENDOR_ID_CAVIUM, 0xA026, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_CAVIUM, 0xA059, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_CAVIUM, 0xA060, pci_quirk_mf_endpoint_acs },

Is there a plan to add ACS capabilities to future devices, or is
Cavium just resigned to forever adding and backporting quirks?

>  	/* APM X-Gene */
>  	{ PCI_VENDOR_ID_AMCC, 0xE004, pci_quirk_xgene_acs },
>  	/* Ampere Computing */
> -- 
> 2.25.1
>