linux-kernel - Re: [PATCH] drm/amdgpu: add support of bios dump in devcoredump

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Message-ID: <0033d14d-f1ad-4e18-8b9d-42aa255391c5@amd.com>
Date: Tue, 26 Mar 2024 23:04:54 +0530
From: "Khatri, Sunil" <sukhatri@....com>
To: Alex Deucher <alexdeucher@...il.com>, Sunil Khatri <sunil.khatri@....com>
Cc: Alex Deucher <alexander.deucher@....com>,
 Christian König <christian.koenig@....com>,
 Shashank Sharma <shashank.sharma@....com>, amd-gfx@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 Hawking Zhang <Hawking.Zhang@....com>,
 Felix Kuehling <Felix.Kuehling@....com>, Lijo Lazar <lijo.lazar@....com>
Subject: Re: [PATCH] drm/amdgpu: add support of bios dump in devcoredump


On 3/26/2024 10:23 PM, Alex Deucher wrote:
> On Tue, Mar 26, 2024 at 10:38 AM Sunil Khatri <sunil.khatri@....com> wrote:
>> dump the bios binary in the devcoredump.
>>
>> Signed-off-by: Sunil Khatri <sunil.khatri@....com>
>> ---
>>   .../gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c  | 20 +++++++++++++++++++
>>   1 file changed, 20 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c
>> index 44c5da8aa9ce..f33963d777eb 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dev_coredump.c
>> @@ -132,6 +132,26 @@ amdgpu_devcoredump_read(char *buffer, loff_t offset, size_t count,
>>          drm_printf(&p, "Faulty page starting at address: 0x%016llx\n", fault_info->addr);
>>          drm_printf(&p, "Protection fault status register: 0x%x\n\n", fault_info->status);
>>
>> +       /* Dump BIOS */
>> +       if (coredump->adev->bios && coredump->adev->bios_size) {
>> +               int i = 0;
>> +
>> +               drm_printf(&p, "BIOS Binary dump\n");
>> +               drm_printf(&p, "Valid BIOS  Size:%d bytes type:%s\n",
>> +                          coredump->adev->bios_size,
>> +                          coredump->adev->is_atom_fw ?
>> +                          "Atom bios":"Non Atom Bios");
>> +
>> +               while (i < coredump->adev->bios_size) {
>> +                       /* Printing 15 bytes in a line */
>> +                       if (i % 15 == 0)
>> +                               drm_printf(&p, "\n");
>> +                       drm_printf(&p, "0x%x \t", coredump->adev->bios[i]);
>> +                       i++;
>> +               }
>> +               drm_printf(&p, "\n");
>> +       }
> I don't think it's too useful to dump this as text.  I was hoping it
> could be a binary.  I guess, we can just get this from debugfs if we
> need it if a binary is not possible.


Yes , this dumps in text format only and the binary is already available 
in debugfs. So discarding the patch.

>
> Alex
>
>
>> +
>>          /* Add ring buffer information */
>>          drm_printf(&p, "Ring buffer information\n");
>>          for (int i = 0; i < coredump->adev->num_rings; i++) {
>> --
>> 2.34.1
>>