[PATCH] drm/amdgpu: fix some uninitialized variables

[Zhang, Jesse(Jie)]

[AMD Official Use Only - General]

Hi Alex,

-----Original Message-----
From: Alex Deucher <alexdeucher at gmail.com>
Sent: Wednesday, April 24, 2024 9:46 AM
To: Zhang, Jesse(Jie) <Jesse.Zhang at amd.com>
Cc: amd-gfx at lists.freedesktop.org; Deucher, Alexander <Alexander.Deucher at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>; Huang, Tim <Tim.Huang at amd.com>
Subject: Re: [PATCH] drm/amdgpu: fix some uninitialized variables

On Tue, Apr 23, 2024 at 9:27 PM Jesse Zhang <jesse.zhang at amd.com> wrote:
>
> Fix some variables not initialized before use.
> Scan them out using Synopsys tools.
>
> Signed-off-by: Jesse Zhang <Jesse.Zhang at amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c | 2 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c | 5 +++++
>  drivers/gpu/drm/amd/amdgpu/atom.c       | 1 +
>  drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c  | 3 ++-
> drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c  | 3 ++-
> drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c  | 3 ++-

Please split out the SDMA changes into a separate patch.

More comments below on the other hunks.

>  6 files changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c
> index 59acf424a078..60d97cd14855 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c
> @@ -742,7 +742,7 @@ int amdgpu_vce_ring_parse_cs(struct amdgpu_cs_parser *p,
>         uint32_t destroyed = 0;
>         uint32_t created = 0;
>         uint32_t allocated = 0;
> -       uint32_t tmp, handle = 0;
> +       uint32_t tmp = 0, handle = 0;

Can you elaborate on what the issue is here?  Presumably it's warning about size being passed as a parameter in the function?
[Zhang, Jesse(Jie)]  Using uninitialized value *size when calling amdgpu_vce_cs_reloc for case 0x03000001. Because uint32_t *size = &tmp;
                I'm not sure if other commands initialize the size before running case 0x03000001.

>         uint32_t *size = &tmp;
>         unsigned int idx;
>         int i, r = 0;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
> index 677eb141554e..13125ddd5e86 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
> @@ -410,6 +410,11 @@ static void amdgpu_vcn_idle_work_handler(struct work_struct *work)
>                         else
>                                 new_state.fw_based =
> VCN_DPG_STATE__UNPAUSE;
>
> +                       if (amdgpu_fence_count_emitted(adev->jpeg.inst->ring_dec))
> +                               new_state.jpeg = VCN_DPG_STATE__PAUSE;
> +                       else
> +                               new_state.jpeg =
> + VCN_DPG_STATE__UNPAUSE;
> +
>                         adev->vcn.pause_dpg_mode(adev, j, &new_state);
>                 }
>

This should be a separate patch as well.
 Thanks for your reminder, Alex, I will.


> diff --git a/drivers/gpu/drm/amd/amdgpu/atom.c
> b/drivers/gpu/drm/amd/amdgpu/atom.c
> index 72362df352f6..d552e013354c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/atom.c
> +++ b/drivers/gpu/drm/amd/amdgpu/atom.c
> @@ -1243,6 +1243,7 @@ static int amdgpu_atom_execute_table_locked(struct atom_context *ctx, int index,
>         ectx.ps_size = params_size;
>         ectx.abort = false;
>         ectx.last_jump = 0;
> +       ectx.last_jump_jiffies = 0;
>         if (ws) {
>                 ectx.ws = kcalloc(4, ws, GFP_KERNEL);
>                 ectx.ws_size = ws;
> diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
> b/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
> index 45a2d0a5a2d7..b7d33d78bce0 100644
> --- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
> @@ -999,7 +999,8 @@ static int sdma_v5_0_ring_test_ring(struct amdgpu_ring *ring)
>         r = amdgpu_ring_alloc(ring, 20);
>         if (r) {
>                 DRM_ERROR("amdgpu: dma failed to lock ring %d (%d).\n", ring->idx, r);
> -               amdgpu_device_wb_free(adev, index);
> +               if (!ring->is_mes_queue)
> +                       amdgpu_device_wb_free(adev, index);
>                 return r;
>         }
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
> b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
> index 43e64b2da575..cc9e961f0078 100644
> --- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
> +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
> @@ -839,7 +839,8 @@ static int sdma_v5_2_ring_test_ring(struct amdgpu_ring *ring)
>         r = amdgpu_ring_alloc(ring, 20);
>         if (r) {
>                 DRM_ERROR("amdgpu: dma failed to lock ring %d (%d).\n", ring->idx, r);
> -               amdgpu_device_wb_free(adev, index);
> +               if (!ring->is_mes_queue)
> +                       amdgpu_device_wb_free(adev, index);
>                 return r;
>         }
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c
> b/drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c
> index 1f4877195213..c833b6b8373b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v6_0.c
> @@ -861,7 +861,8 @@ static int sdma_v6_0_ring_test_ring(struct amdgpu_ring *ring)
>         r = amdgpu_ring_alloc(ring, 5);
>         if (r) {
>                 DRM_ERROR("amdgpu: dma failed to lock ring %d (%d).\n", ring->idx, r);
> -               amdgpu_device_wb_free(adev, index);
> +               if (!ring->is_mes_queue)
> +                       amdgpu_device_wb_free(adev, index);
>                 return r;
>         }
>
> --
> 2.25.1
>