[PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

[Pan, Xinhui]

[AMD Official Use Only - Internal Distribution Only]

page table BOs share same resv.It should be ok using any of them, root bo resv or bo resv.
I forgot to unref bos which cause problems. not good at rebasing...

thanks
xinhui
________________________________
From: Koenig, Christian <Christian.Koenig at amd.com>
Sent: Friday, March 13, 2020 9:34:42 PM
To: Pan, Xinhui <Xinhui.Pan at amd.com>; amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Kuehling, Felix <Felix.Kuehling at amd.com>
Subject: Re: [PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

Am 13.03.20 um 12:53 schrieb xinhui pan:
> If a job need sync the bo resv, it is likely that bo need the job fence
> to sync with others.

That won't work because this is the wrong resv object :)

You added the fence to the mapped BO and not the page table.

No wonder that this doesn't work,
Christian.

>
> Cc: Christian König <christian.koenig at amd.com>
> Cc: Alex Deucher <alexander.deucher at amd.com>
> Cc: Felix Kuehling <Felix.Kuehling at amd.com>
> Suggested-by: Christian König <christian.koenig at amd.com>
> Signed-off-by: xinhui pan <xinhui.pan at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h      | 5 +++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 9 +++++++++
>   2 files changed, 14 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> index b5705fcfc935..ca6021b4200b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> @@ -226,6 +226,11 @@ struct amdgpu_vm_update_params {
>         * @num_dw_left: number of dw left for the IB
>         */
>        unsigned int num_dw_left;
> +
> +     /**
> +      * @resv: sync the resv and add job fence to it conditionally.
> +      */
> +     struct dma_resv *resv;
>   };
>
>   struct amdgpu_vm_update_funcs {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> index 4cc7881f438c..0cfac59bff36 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> @@ -70,6 +70,8 @@ static int amdgpu_vm_sdma_prepare(struct amdgpu_vm_update_params *p,
>
>        p->num_dw_left = ndw;
>
> +     p->resv = resv;
> +
>        if (!resv)
>                return 0;
>
> @@ -111,6 +113,13 @@ static int amdgpu_vm_sdma_commit(struct amdgpu_vm_update_params *p,
>                swap(p->vm->last_delayed, tmp);
>        dma_fence_put(tmp);
>
> +     /* add job fence to resv.
> +      * MM notifier path is an exception as we can not grab the
> +      * resv lock.
> +      */
> +     if (!p->direct && p->resv)
> +             dma_resv_add_shared_fence(p->resv, f);
> +
>        if (fence && !p->direct)
>                swap(*fence, f);
>        dma_fence_put(f);

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