On Wed, Mar 29, 2023 at 11:48 AM Shashank Sharma
<shashank.sharma@xxxxxxx> wrote:
>
> From: Alex Deucher <alexander.deucher@xxxxxxx>
>
> This patch adds changes:
> - to accommodate the new GEM domain DOORBELL
> - to accommodate the new TTM PL DOORBELL
>
> in order to manage doorbell pages as GEM object.
>
> V2: Addressed reviwe comments from Christian
> - drop the doorbell changes for pinning/unpinning
> - drop the doorbell changes for dma-buf map
> - drop the doorbell changes for sgt
> - no need to handle TTM_PL_FLAG_CONTIGUOUS for doorbell
> - add caching type for doorbell
>
> Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> Cc: Christian Koenig <christian.koenig@xxxxxxx>
>
> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
> Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 11 ++++++++++-
> drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h | 2 ++
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 16 +++++++++++++++-
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 1 +
Also need to update amdgpu_mem_type_to_domain() in amdgpu_object.h
Alex
> 4 files changed, 28 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index 4e684c2afc70..0ec080e240ad 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -147,6 +147,14 @@ void amdgpu_bo_placement_from_domain(struct amdgpu_bo *abo, u32 domain)
> c++;
> }
>
> + if (domain & AMDGPU_GEM_DOMAIN_DOORBELL) {
> + places[c].fpfn = 0;
> + places[c].lpfn = 0;
> + places[c].mem_type = AMDGPU_PL_DOORBELL;
> + places[c].flags = 0;
> + c++;
> + }
> +
> if (domain & AMDGPU_GEM_DOMAIN_GTT) {
> places[c].fpfn = 0;
> places[c].lpfn = 0;
> @@ -466,7 +474,7 @@ static bool amdgpu_bo_validate_size(struct amdgpu_device *adev,
> goto fail;
> }
>
> - /* TODO add more domains checks, such as AMDGPU_GEM_DOMAIN_CPU */
> + /* TODO add more domains checks, such as AMDGPU_GEM_DOMAIN_CPU, AMDGPU_GEM_DOMAIN_DOORBELL */
> return true;
>
> fail:
> @@ -1013,6 +1021,7 @@ void amdgpu_bo_unpin(struct amdgpu_bo *bo)
> } else if (bo->tbo.resource->mem_type == TTM_PL_TT) {
> atomic64_sub(amdgpu_bo_size(bo), &adev->gart_pin_size);
> }
> +
> }
>
> static const char *amdgpu_vram_names[] = {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
> index 5c4f93ee0c57..3c988cc406e4 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
> @@ -90,6 +90,7 @@ static inline void amdgpu_res_first(struct ttm_resource *res,
> cur->node = block;
> break;
> case TTM_PL_TT:
> + case AMDGPU_PL_DOORBELL:
> node = to_ttm_range_mgr_node(res)->mm_nodes;
> while (start >= node->size << PAGE_SHIFT)
> start -= node++->size << PAGE_SHIFT;
> @@ -152,6 +153,7 @@ static inline void amdgpu_res_next(struct amdgpu_res_cursor *cur, uint64_t size)
> cur->size = min(amdgpu_vram_mgr_block_size(block), cur->remaining);
> break;
> case TTM_PL_TT:
> + case AMDGPU_PL_DOORBELL:
> node = cur->node;
>
> cur->node = ++node;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 55e0284b2bdd..6f61491ef3dd 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -128,6 +128,7 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
> case AMDGPU_PL_GDS:
> case AMDGPU_PL_GWS:
> case AMDGPU_PL_OA:
> + case AMDGPU_PL_DOORBELL:
> placement->num_placement = 0;
> placement->num_busy_placement = 0;
> return;
> @@ -500,9 +501,11 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
> if (old_mem->mem_type == AMDGPU_PL_GDS ||
> old_mem->mem_type == AMDGPU_PL_GWS ||
> old_mem->mem_type == AMDGPU_PL_OA ||
> + old_mem->mem_type == AMDGPU_PL_DOORBELL ||
> new_mem->mem_type == AMDGPU_PL_GDS ||
> new_mem->mem_type == AMDGPU_PL_GWS ||
> - new_mem->mem_type == AMDGPU_PL_OA) {
> + new_mem->mem_type == AMDGPU_PL_OA ||
> + new_mem->mem_type == AMDGPU_PL_DOORBELL) {
> /* Nothing to save here */
> ttm_bo_move_null(bo, new_mem);
> goto out;
> @@ -586,6 +589,12 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_device *bdev,
> mem->bus.offset += adev->gmc.aper_base;
> mem->bus.is_iomem = true;
> break;
> + case AMDGPU_PL_DOORBELL:
> + mem->bus.offset = mem->start << PAGE_SHIFT;
> + mem->bus.offset += adev->doorbell.base;
> + mem->bus.is_iomem = true;
> + mem->bus.caching = ttm_uncached;
> + break;
> default:
> return -EINVAL;
> }
> @@ -600,6 +609,10 @@ static unsigned long amdgpu_ttm_io_mem_pfn(struct ttm_buffer_object *bo,
>
> amdgpu_res_first(bo->resource, (u64)page_offset << PAGE_SHIFT, 0,
> &cursor);
> +
> + if (bo->resource->mem_type == AMDGPU_PL_DOORBELL)
> + return ((uint64_t)(adev->doorbell.base + cursor.start)) >> PAGE_SHIFT;
> +
> return (adev->gmc.aper_base + cursor.start) >> PAGE_SHIFT;
> }
>
> @@ -1267,6 +1280,7 @@ uint64_t amdgpu_ttm_tt_pde_flags(struct ttm_tt *ttm, struct ttm_resource *mem)
> flags |= AMDGPU_PTE_VALID;
>
> if (mem && (mem->mem_type == TTM_PL_TT ||
> + mem->mem_type == AMDGPU_PL_DOORBELL ||
> mem->mem_type == AMDGPU_PL_PREEMPT)) {
> flags |= AMDGPU_PTE_SYSTEM;
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> index e2cd5894afc9..761cd6b2b942 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> @@ -33,6 +33,7 @@
> #define AMDGPU_PL_GWS (TTM_PL_PRIV + 1)
> #define AMDGPU_PL_OA (TTM_PL_PRIV + 2)
> #define AMDGPU_PL_PREEMPT (TTM_PL_PRIV + 3)
> +#define AMDGPU_PL_DOORBELL (TTM_PL_PRIV + 4)
>
> #define AMDGPU_GTT_MAX_TRANSFER_SIZE 512
> #define AMDGPU_GTT_NUM_TRANSFER_WINDOWS 2
> --
> 2.40.0
>
