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Message-ID: <9e1dbcbc-f00e-417c-995e-d9c539292e03@amd.com>
Date: Mon, 11 Mar 2024 14:59:27 +0100
From: Christian König <christian.koenig@....com>
To: Sunil Khatri <sunil.khatri@....com>,
Alex Deucher <alexander.deucher@....com>,
Shashank Sharma <shashank.sharma@....com>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amdgpu: add ring buffer information in devcoredump
Am 11.03.24 um 13:22 schrieb Sunil Khatri:
> Add relevant ringbuffer information such as
> rptr, wptr, ring name, ring size and also
> the ring contents for each ring on a gpu reset.
>
> Signed-off-by: Sunil Khatri <sunil.khatri@....com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
> index 6d059f853adc..1992760039da 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
> @@ -215,6 +215,27 @@ amdgpu_devcoredump_read(char *buffer, loff_t offset, size_t count,
> fault_info->status);
> }
>
> + drm_printf(&p, "Ring buffer information\n");
> + for (int i = 0; i < coredump->adev->num_rings; i++) {
> + int j = 0;
> + struct amdgpu_ring *ring = coredump->adev->rings[i];
> +
> + drm_printf(&p, "ring name: %s\n", ring->name);
> + drm_printf(&p, "Rptr: 0x%llx Wptr: 0x%llx\n",
> + amdgpu_ring_get_rptr(ring) & ring->buf_mask,
> + amdgpu_ring_get_wptr(ring) & ring->buf_mask);
Don't apply the mask here. We do have some use cases where the rptr and
wptr are outside the ring buffer.
> + drm_printf(&p, "Ring size in dwords: %d\n",
> + ring->ring_size / 4);
Rather print the mask as additional value here.
> + drm_printf(&p, "Ring contents\n");
> + drm_printf(&p, "Offset \t Value\n");
> +
> + while (j < ring->ring_size) {
> + drm_printf(&p, "0x%x \t 0x%x\n", j, ring->ring[j/4]);
> + j += 4;
> + }
> + drm_printf(&p, "Ring dumped\n");
That seems superfluous.
Regards,
Christian.
> + }
> +
> if (coredump->reset_vram_lost)
> drm_printf(&p, "VRAM is lost due to GPU reset!\n");
> if (coredump->adev->reset_info.num_regs) {
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