linux-kernel - Re: [PATCH] drm/amdgpu: fix SI failure due to doorbells allocation

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Date:   Mon, 9 Oct 2023 14:45:54 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     "Sharma, Shashank" <Shashank.Sharma@....com>
Cc:     Icenowy Zheng <uwu@...nowy.me>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        "Yadav, Arvind" <Arvind.Yadav@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amdgpu: fix SI failure due to doorbells allocation

Applied.  Thanks!

On Mon, Oct 9, 2023 at 5:27 AM Sharma, Shashank <Shashank.Sharma@....com> wrote:
>
> [AMD Official Use Only - General]
>
> Reviewed-by: Shashank Sharma <shashank.sharma@....com>
>
> Regards
> Shashank
> -----Original Message-----
> From: Icenowy Zheng <uwu@...nowy.me>
> Sent: Sunday, October 8, 2023 8:47 AM
> To: Deucher, Alexander <Alexander.Deucher@....com>; Koenig, Christian <Christian.Koenig@....com>; Pan, Xinhui <Xinhui.Pan@....com>; David Airlie <airlied@...il.com>; Daniel Vetter <daniel@...ll.ch>; Sharma, Shashank <Shashank.Sharma@....com>; Yadav, Arvind <Arvind.Yadav@....com>
> Cc: amd-gfx@...ts.freedesktop.org; dri-devel@...ts.freedesktop.org; linux-kernel@...r.kernel.org; Icenowy Zheng <uwu@...nowy.me>
> Subject: [PATCH] drm/amdgpu: fix SI failure due to doorbells allocation
>
> SI hardware does not have doorbells at all, however currently the code will try to do the allocation and thus fail, makes SI AMDGPU not usable.
>
> Fix this failure by skipping doorbells allocation when doorbells count is zero.
>
> Fixes: 54c30d2a8def ("drm/amdgpu: create kernel doorbell pages")
> Signed-off-by: Icenowy Zheng <uwu@...nowy.me>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
> index d0249ada91d30..599aece42017a 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_doorbell_mgr.c
> @@ -142,6 +142,10 @@ int amdgpu_doorbell_create_kernel_doorbells(struct amdgpu_device *adev)
>         int r;
>         int size;
>
> +       /* SI HW does not have doorbells, skip allocation */
> +       if (adev->doorbell.num_kernel_doorbells == 0)
> +               return 0;
> +
>         /* Reserve first num_kernel_doorbells (page-aligned) for kernel ops */
>         size = ALIGN(adev->doorbell.num_kernel_doorbells * sizeof(u32), PAGE_SIZE);
>
> --
> 2.39.1
>