[Public]
> -----Original Message-----
> From: SHANMUGAM, SRINIVASAN <srinivasan.shanmu...@amd.com>
> Sent: Wednesday, August 20, 2025 7:33 AM
> To: Koenig, Christian <christian.koe...@amd.com>; Deucher, Alexander
> <alexander.deuc...@amd.com>
> Cc: amd-gfx@lists.freedesktop.org; SHANMUGAM, SRINIVASAN
> <srinivasan.shanmu...@amd.com>
> Subject: [RFC PATCH 4/7] drm/amdgpu: Add mmio_remap fields to amdgpu_device
>
> Add bookkeeping for the remap page to struct amdgpu_device:
>
> * mmio_remap_bo (singleton BO)
> * mmio_remap_base, mmio_remap_barsz (register BAR base/size)
> * mmio_remap_offset (BAR-relative offset of the remap page)
> * mmio_remap_size (PAGE_SIZE)
It's not PAGE_SIZE it's 4K. If the PAGE_SIZE is >4K on the system, then we
can't support this.
>
> Cc: Christian König <christian.koe...@amd.com>
> Cc: Alex Deucher <alexander.deuc...@amd.com>
> Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmu...@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index ddd472e56f69..6c477596617b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -1038,6 +1038,13 @@ struct amdgpu_device {
> amdgpu_block_wreg_t audio_endpt_wreg;
> struct amdgpu_doorbell doorbell;
>
> + /* ===== MMIO remap (HDP flush) bookkeeping ===== */
> + struct amdgpu_bo *mmio_remap_bo; /* singleton BO */
> + resource_size_t mmio_remap_base; /* REG BAR bus base
> */
> + resource_size_t mmio_remap_barsz; /* REG BAR size */
> + resource_size_t mmio_remap_offset;/* BAR-relative
> offset of
> remap page */
> + resource_size_t mmio_remap_size; /* always PAGE_SIZE
> */
Always 4K.
Alex
> +
> /* clock/pll info */
> struct amdgpu_clock clock;
>
> --
> 2.34.1
