[PATCH 1/6] drm/amdgpu: add new asic callbacks for HDP flush/invalidation

[Christian König]

Am 07.09.2017 um 00:04 schrieb Samuel Li:
> From: Alex Deucher <alexander.deucher at amd.com>
>
> Needed to properly flush the HDP cache with the CPU from rather
> than the GPU.
>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> Signed-off-by: Samuel Li <Samuel.Li at amd.com>

Patches #1-#5 are unnecessary for gem_prime_mmap support() (but don't 
completely drop them, we could use them for CPU based VM page table 
updates).

Patch #6 looks pretty good to me, just a few notes about the HDP 
flush/invalidate.

Regards,
Christian.

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu.h | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index d2aaad7..6f262ce 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -1279,6 +1279,10 @@ struct amdgpu_asic_funcs {
>   	void (*set_pcie_lanes)(struct amdgpu_device *adev, int lanes);
>   	/* get config memsize register */
>   	u32 (*get_config_memsize)(struct amdgpu_device *adev);
> +	/* flush hdp write queue */
> +	void (*flush_hdp)(struct amdgpu_device *adev);
> +	/* invalidate hdp read cache */
> +	void (*invalidate_hdp)(struct amdgpu_device *adev);
>   };
>   
>   /*
> @@ -1737,6 +1741,8 @@ amdgpu_get_sdma_instance(struct amdgpu_ring *ring)
>   #define amdgpu_asic_read_bios_from_rom(adev, b, l) (adev)->asic_funcs->read_bios_from_rom((adev), (b), (l))
>   #define amdgpu_asic_read_register(adev, se, sh, offset, v)((adev)->asic_funcs->read_register((adev), (se), (sh), (offset), (v)))
>   #define amdgpu_asic_get_config_memsize(adev) (adev)->asic_funcs->get_config_memsize((adev))
> +#define amdgpu_asic_flush_hdp(adev) (adev)->asic_funcs->flush_hdp((adev))
> +#define amdgpu_asic_invalidate_hdp(adev) (adev)->asic_funcs->invalidate_hdp((adev))
>   #define amdgpu_gart_flush_gpu_tlb(adev, vmid) (adev)->gart.gart_funcs->flush_gpu_tlb((adev), (vmid))
>   #define amdgpu_gart_set_pte_pde(adev, pt, idx, addr, flags) (adev)->gart.gart_funcs->set_pte_pde((adev), (pt), (idx), (addr), (flags))
>   #define amdgpu_gart_get_vm_pde(adev, addr) (adev)->gart.gart_funcs->get_vm_pde((adev), (addr))