[PATCH] drm/amdgpu: Align serial size in drm_amdgpu_info_vbios

[Nieto, David M]

Then the application would need to issue the ioctl and then open a sysfs file to get all the information it needs. It makes little sense from a programming perspective to add an incomplete interface in my opinion

________________________________
From: Gu, JiaWei (Will) <JiaWei.Gu at amd.com>
Sent: Monday, May 10, 2021 12:13:07 AM
To: Nieto, David M <David.Nieto at amd.com>
Cc: Alex Deucher <alexdeucher at gmail.com>; amd-gfx list <amd-gfx at lists.freedesktop.org>; Kees Cook <keescook at chromium.org>; Deng, Emily <Emily.Deng at amd.com>
Subject: RE: [PATCH] drm/amdgpu: Align serial size in drm_amdgpu_info_vbios

[AMD Official Use Only - Internal Distribution Only]

Hi David,

What I meant is to ONLY delete the serial[16] from drm_amdgpu_info_vbios, not the whole struct.

struct drm_amdgpu_info_vbios {
        __u8 name[64];
        __u32 dbdf;
        __u8 vbios_pn[64];
        __u32 version;
        __u8 date[32];
        __u8 serial[16]; // jiawei: shall we delete this
        __u32 dev_id;
        __u32 rev_id;
        __u32 sub_dev_id;
        __u32 sub_ved_id;
};

serial[16] in drm_amdgpu_info_vbios  copied from adev->serial, but there's already a sysfs named serial_number, which exposes it already.

static ssize_t amdgpu_device_get_serial_number(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        struct drm_device *ddev = dev_get_drvdata(dev);
        struct amdgpu_device *adev = ddev->dev_private;

        return snprintf(buf, PAGE_SIZE, "%s\n", adev->serial);
}

Thanks,
Jiawei


-----Original Message-----
From: Nieto, David M <David.Nieto at amd.com>
Sent: Monday, May 10, 2021 2:53 PM
To: Gu, JiaWei (Will) <JiaWei.Gu at amd.com>
Cc: Alex Deucher <alexdeucher at gmail.com>; amd-gfx list <amd-gfx at lists.freedesktop.org>; Kees Cook <keescook at chromium.org>; Deng, Emily <Emily.Deng at amd.com>
Subject: Re: [PATCH] drm/amdgpu: Align serial size in drm_amdgpu_info_vbios

No, this structure contains all the details of the vbios: date, serial number, name, etc.

The sysfs node only contains the vbios name string

> On May 9, 2021, at 23:33, Gu, JiaWei (Will) <JiaWei.Gu at amd.com> wrote:
>
> [AMD Official Use Only - Internal Distribution Only]
>
> With a second thought,
> __u8 serial[16] in drm_amdgpu_info_vbios is a bit redundant, sysfs serial_number already exposes it.
>
> Is it fine to abandon it from drm_amdgpu_info_vbios struct? @Alex
> Deucher @Nieto, David M
>
> Best regards,
> Jiawei
>
> -----Original Message-----
> From: Alex Deucher <alexdeucher at gmail.com>
> Sent: Sunday, May 9, 2021 11:59 PM
> To: Gu, JiaWei (Will) <JiaWei.Gu at amd.com>
> Cc: amd-gfx list <amd-gfx at lists.freedesktop.org>; Kees Cook
> <keescook at chromium.org>
> Subject: Re: [PATCH] drm/amdgpu: Align serial size in
> drm_amdgpu_info_vbios
>
>> On Sat, May 8, 2021 at 2:48 AM Jiawei Gu <Jiawei.Gu at amd.com> wrote:
>>
>> 20 should be serial char size now instead of 16.
>>
>> Signed-off-by: Jiawei Gu <Jiawei.Gu at amd.com>
>
> Please make sure this keeps proper 64 bit alignment in the structure.
>
> Alex
>
>
>> ---
>> include/uapi/drm/amdgpu_drm.h | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/include/uapi/drm/amdgpu_drm.h
>> b/include/uapi/drm/amdgpu_drm.h index 2b487a8d2727..1c20721f90da
>> 100644
>> --- a/include/uapi/drm/amdgpu_drm.h
>> +++ b/include/uapi/drm/amdgpu_drm.h
>> @@ -957,7 +957,7 @@ struct drm_amdgpu_info_vbios {
>>        __u8 vbios_pn[64];
>>        __u32 version;
>>        __u8 date[32];
>> -       __u8 serial[16];
>> +       __u8 serial[20];
>>        __u32 dev_id;
>>        __u32 rev_id;
>>        __u32 sub_dev_id;
>> --
>> 2.17.1
>>
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>> i
>> awei.Gu%40amd.com%7Ccea31833184c41e8574508d9130360cc%7C3dd8961fe4884e
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>> e
>> rved=0
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