linux-kernel - Re: [PATCH] drm/msm/a6xx: Print SQE fw version

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Date: Tue, 4 Jun 2024 19:31:40 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Rob Clark <robdclark@...il.com>
Cc: dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org, 
	freedreno@...ts.freedesktop.org, Rob Clark <robdclark@...omium.org>, 
	Sean Paul <sean@...rly.run>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Abhinav Kumar <quic_abhinavk@...cinc.com>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm/a6xx: Print SQE fw version

On Tue, 4 Jun 2024 at 18:48, Rob Clark <robdclark@...il.com> wrote:
>
> From: Rob Clark <robdclark@...omium.org>
>
> Add the SQE fw version to dmesg and devcoredump.
>
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c       | 32 +++++++++++++++++++--
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.h       |  1 +
>  drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c |  2 ++
>  3 files changed, 33 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index 56bfb228808d..5a2a005003c8 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -665,6 +665,32 @@ static int a7xx_cp_init(struct msm_gpu *gpu)
>         return a6xx_idle(gpu, ring) ? 0 : -EINVAL;
>  }
>
> +static uint32_t get_ucode_version(const uint32_t *data)
> +{
> +       uint32_t version;
> +
> +       /* NOTE: compared to kgsl, we've already stripped off the first dword: */
> +       version = data[0];
> +
> +       if ((version & 0xf) != 0xa)
> +               return version;
> +
> +       version &= ~0xfff;
> +       return  version | ((data[2] & 0xfff000) >> 12);
> +}
> +
> +uint32_t a6xx_get_sqe_version(struct msm_gpu *gpu)
> +{
> +       struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> +       struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
> +       uint32_t *buf = msm_gem_get_vaddr(a6xx_gpu->sqe_bo);
> +       uint32_t version = get_ucode_version(buf);
> +
> +       msm_gem_put_vaddr(a6xx_gpu->sqe_bo);

Wouldn't it be easier to save the SQE version when the firmware is
loaded and then just return it?
Or the point is about reading the SQE version at runtime?

> +
> +       return version;
> +}
> +
>  /*
>   * Check that the microcode version is new enough to include several key
>   * security fixes. Return true if the ucode is safe.
> @@ -681,6 +707,8 @@ static bool a6xx_ucode_check_version(struct a6xx_gpu *a6xx_gpu,
>         if (IS_ERR(buf))
>                 return false;
>
> +       DRM_DEV_INFO(&gpu->pdev->dev, "Have SQE version %03x\n", get_ucode_version(buf));

I'd suggest drm_dbg_driver() instead. I think the motto is to keep the
kernel more or less quiet.

> +
>         /* A7xx is safe! */
>         if (adreno_is_a7xx(adreno_gpu) || adreno_is_a702(adreno_gpu))
>                 return true;
> @@ -714,7 +742,7 @@ static bool a6xx_ucode_check_version(struct a6xx_gpu *a6xx_gpu,
>                 }
>
>                 DRM_DEV_ERROR(&gpu->pdev->dev,
> -                       "a630 SQE ucode is too old. Have version %x need at least %x\n",
> +                       "a630 SQE ucode is too old. Have version %03x need at least %03x\n",
>                         buf[0] & 0xfff, 0x190);
>         } else if (!strcmp(sqe_name, "a650_sqe.fw")) {
>                 if ((buf[0] & 0xfff) >= 0x095) {
> @@ -723,7 +751,7 @@ static bool a6xx_ucode_check_version(struct a6xx_gpu *a6xx_gpu,
>                 }
>
>                 DRM_DEV_ERROR(&gpu->pdev->dev,
> -                       "a650 SQE ucode is too old. Have version %x need at least %x\n",
> +                       "a650 SQE ucode is too old. Have version %03x need at least %03x\n",
>                         buf[0] & 0xfff, 0x095);
>         } else if (!strcmp(sqe_name, "a660_sqe.fw")) {
>                 ret = true;
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
> index 1c3cc6df70fe..c206dab8bc08 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
> @@ -109,6 +109,7 @@ void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp,
>                        bool suspended);
>  unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu);
>
> +uint32_t a6xx_get_sqe_version(struct msm_gpu *gpu);
>  void a6xx_show(struct msm_gpu *gpu, struct msm_gpu_state *state,
>                 struct drm_printer *p);
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> index 0a7717a4fc2f..1acfe39eb8e0 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> @@ -1957,6 +1957,8 @@ void a6xx_show(struct msm_gpu *gpu, struct msm_gpu_state *state,
>
>         adreno_show(gpu, state, p);
>
> +       drm_printf(p, "sqe-version: 0x%08x\n", a6xx_get_sqe_version(gpu));
> +
>         drm_puts(p, "gmu-log:\n");
>         if (a6xx_state->gmu_log) {
>                 struct msm_gpu_state_bo *gmu_log = a6xx_state->gmu_log;
> --
> 2.45.1
>


-- 
With best wishes
Dmitry