[AMD Public Use]
-----Original Message-----
From: daniel@xxxxxxxx <daniel@xxxxxxxx>
Sent: Tuesday, July 21, 2020 2:58 PM
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx; Chauhan, Madhav <Madhav.Chauhan@xxxxxxx>; michael.j.ruhl@xxxxxxxxx; tzimmermann@xxxxxxx
Subject: Re: [PATCH 08/11] drm/amdgpu: stop using TTM_MEMTYPE_FLAG_MAPPABLE
On Tue, Jul 21, 2020 at 09:32:42AM +0200, Christian König wrote:
> The driver does support some not-mapable resources, but those are
> already handled correctly in the switch/case statement in the code.
>
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 11 ++++-------
> 1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 44fa8bc49d18..0dd5e802091d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -84,7 +84,7 @@ static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
> switch (type) {
> case TTM_PL_SYSTEM:
> /* System memory */
> - man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
> + man->flags = 0;
> man->available_caching = TTM_PL_MASK_CACHING;
> man->default_caching = TTM_PL_FLAG_CACHED;
> break;
> @@ -93,13 +93,12 @@ static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
> man->func = &amdgpu_gtt_mgr_func;
> man->available_caching = TTM_PL_MASK_CACHING;
> man->default_caching = TTM_PL_FLAG_CACHED;
> - man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
> + man->flags = 0;
> break;
> case TTM_PL_VRAM:
> /* "On-card" video ram */
> man->func = &amdgpu_vram_mgr_func;
> - man->flags = TTM_MEMTYPE_FLAG_FIXED |
> - TTM_MEMTYPE_FLAG_MAPPABLE;
> + man->flags = TTM_MEMTYPE_FLAG_FIXED;
> man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
> man->default_caching = TTM_PL_FLAG_WC;
> break;
> @@ -796,7 +795,6 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
> */
> static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
> struct ttm_mem_reg *mem) {
> - struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
> struct amdgpu_device *adev = amdgpu_ttm_adev(bdev);
> struct drm_mm_node *mm_node = mem->mm_node;
>
> @@ -805,8 +803,7 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
> mem->bus.size = mem->num_pages << PAGE_SHIFT;
> mem->bus.base = 0;
> mem->bus.is_iomem = false;
> - if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
> - return -EINVAL;
This check catches the various special on-board memories, or at least I couldnt' find where mmap for these is disallowed.
For various on board memories (GDS, GWS, OA). TTM_MEMTYPE_FLAG_MAPPABLE is not added while initializing the BO manger.
Can you please elaborate??
Regards,
Madhav
-Daniel
> +
> switch (mem->mem_type) {
> case TTM_PL_SYSTEM:
> /* system memory */
> --
> 2.17.1
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fblog.ffwll.ch%2F&data=02%7C01%7CMadhav.Chauhan%40amd.com%7C38d9dcf0a17344b8fa9008d82d586405%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637309204946382107&sdata=g%2F4b4hJZZ3XehZmCVRi61GfCiGIwnJZT8nG%2Bb025o6k%3D&reserved=0
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