linux-kernel - Re: [PATCH] x86/amd_nb: Add a new PCI ID for AMD family 1Ah model 60h

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Message-ID: <20240815165454.GA49023@bhelgaas>
Date: Thu, 15 Aug 2024 11:54:54 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Richard Gong <richard.gong@....com>
Cc: bp@...en8.de, bhelgaas@...gle.com, yazen.ghannam@....com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH] x86/amd_nb: Add a new PCI ID for AMD family 1Ah model 60h

On Thu, Aug 15, 2024 at 10:12:40AM -0500, Richard Gong wrote:
> Add a new PCI ID for Device 18h and Function 4.
> 
> Signed-off-by: Richard Gong <richard.gong@....com>
> ---
> (Without this device ID, amd-atl driver failed to load)

"amd-atl" does not appear in the source, so I don't know what it is.

> ---
>  arch/x86/kernel/amd_nb.c | 1 +
>  include/linux/pci_ids.h  | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
> index 61eadde08511..7566d2c079c2 100644
> --- a/arch/x86/kernel/amd_nb.c
> +++ b/arch/x86/kernel/amd_nb.c
> @@ -125,6 +125,7 @@ static const struct pci_device_id amd_nb_link_ids[] = {
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M78H_DF_F4) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F4) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M00H_DF_F4) },
> +	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M60H_DF_F4) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI200_DF_F4) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI300_DF_F4) },
>  	{}
> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
> index 91182aa1d2ec..d7abfa5beaec 100644
> --- a/include/linux/pci_ids.h
> +++ b/include/linux/pci_ids.h
> @@ -581,6 +581,7 @@
>  #define PCI_DEVICE_ID_AMD_1AH_M00H_DF_F3 0x12c3
>  #define PCI_DEVICE_ID_AMD_1AH_M20H_DF_F3 0x16fb
>  #define PCI_DEVICE_ID_AMD_1AH_M60H_DF_F3 0x124b
> +#define PCI_DEVICE_ID_AMD_1AH_M60H_DF_F4 0x124c

>From include/linux/pci_ids.h:

 *      Do not add new entries to this file unless the definitions
 *      are shared between multiple drivers.

Maybe there's some value in having this definition in pci_ids.h as
opposed to adding a definition in amd_nb.c, where there are many
similar definitions?

Can't tell from this commit log.

Obviously this isn't adding any new *functionality*, so it would be
nice if amd_nb.c could be written so it would require updates only
when the programming model changes, not for every new chip.

Preaching to the choir, I know.

>  #define PCI_DEVICE_ID_AMD_1AH_M70H_DF_F3 0x12bb
>  #define PCI_DEVICE_ID_AMD_MI200_DF_F3	0x14d3
>  #define PCI_DEVICE_ID_AMD_MI300_DF_F3	0x152b
> -- 
> 2.43.0
>