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

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Message-ID: <43994d76-aa1c-4c59-9393-1fd683e20d59@amd.com>
Date: Thu, 15 Aug 2024 12:31:37 -0500
From: "Gong, Richard" <richard.gong@....com>
To: Bjorn Helgaas <helgaas@...nel.org>
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

Hi Bjorn,

On 8/15/2024 11:54 AM, Bjorn Helgaas wrote:
> 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.

Sorry for my typo, it is amd_atl (AMD address translation library) driver.

> 
>> ---
>>   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
>>

Regards,
Richard