[PATCH 2/4] drm/amdgpu/ttm: use multihop
Mike Lothian
mike at fireburn.co.uk
Sun Dec 13 01:44:30 UTC 2020
Hi
This patch is causing issues for me on both a Raven system and a Tonga
(PRIME) system
https://gitlab.freedesktop.org/drm/amd/-/issues/1405
It's only recently been merged into agd5f's tree - which is why I'm
only just noticing it
I realise this has now been submitted for rc1 - please can someone take a look
Thanks
Mike
On Mon, 9 Nov 2020 at 00:54, Dave Airlie <airlied at gmail.com> wrote:
>
> From: Dave Airlie <airlied at redhat.com>
>
> This removes the code to move resources directly between
> SYSTEM and VRAM in favour of using the core ttm mulithop code.
>
> Signed-off-by: Dave Airlie <airlied at redhat.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 136 +++---------------------
> 1 file changed, 13 insertions(+), 123 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index ce0d82802333..e1458d575aa9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -512,119 +512,6 @@ static int amdgpu_move_blit(struct ttm_buffer_object *bo,
> return r;
> }
>
> -/**
> - * amdgpu_move_vram_ram - Copy VRAM buffer to RAM buffer
> - *
> - * Called by amdgpu_bo_move().
> - */
> -static int amdgpu_move_vram_ram(struct ttm_buffer_object *bo, bool evict,
> - struct ttm_operation_ctx *ctx,
> - struct ttm_resource *new_mem)
> -{
> - struct ttm_resource *old_mem = &bo->mem;
> - struct ttm_resource tmp_mem;
> - struct ttm_place placements;
> - struct ttm_placement placement;
> - int r;
> -
> - /* create space/pages for new_mem in GTT space */
> - tmp_mem = *new_mem;
> - tmp_mem.mm_node = NULL;
> - placement.num_placement = 1;
> - placement.placement = &placements;
> - placement.num_busy_placement = 1;
> - placement.busy_placement = &placements;
> - placements.fpfn = 0;
> - placements.lpfn = 0;
> - placements.mem_type = TTM_PL_TT;
> - placements.flags = 0;
> - r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx);
> - if (unlikely(r)) {
> - pr_err("Failed to find GTT space for blit from VRAM\n");
> - return r;
> - }
> -
> - r = ttm_tt_populate(bo->bdev, bo->ttm, ctx);
> - if (unlikely(r))
> - goto out_cleanup;
> -
> - /* Bind the memory to the GTT space */
> - r = amdgpu_ttm_backend_bind(bo->bdev, bo->ttm, &tmp_mem);
> - if (unlikely(r)) {
> - goto out_cleanup;
> - }
> -
> - /* blit VRAM to GTT */
> - r = amdgpu_move_blit(bo, evict, &tmp_mem, old_mem);
> - if (unlikely(r)) {
> - goto out_cleanup;
> - }
> -
> - r = ttm_bo_wait_ctx(bo, ctx);
> - if (unlikely(r))
> - goto out_cleanup;
> -
> - amdgpu_ttm_backend_unbind(bo->bdev, bo->ttm);
> - ttm_resource_free(bo, &bo->mem);
> - ttm_bo_assign_mem(bo, new_mem);
> -out_cleanup:
> - ttm_resource_free(bo, &tmp_mem);
> - return r;
> -}
> -
> -/**
> - * amdgpu_move_ram_vram - Copy buffer from RAM to VRAM
> - *
> - * Called by amdgpu_bo_move().
> - */
> -static int amdgpu_move_ram_vram(struct ttm_buffer_object *bo, bool evict,
> - struct ttm_operation_ctx *ctx,
> - struct ttm_resource *new_mem)
> -{
> - struct ttm_resource *old_mem = &bo->mem;
> - struct ttm_resource tmp_mem;
> - struct ttm_placement placement;
> - struct ttm_place placements;
> - int r;
> -
> - /* make space in GTT for old_mem buffer */
> - tmp_mem = *new_mem;
> - tmp_mem.mm_node = NULL;
> - placement.num_placement = 1;
> - placement.placement = &placements;
> - placement.num_busy_placement = 1;
> - placement.busy_placement = &placements;
> - placements.fpfn = 0;
> - placements.lpfn = 0;
> - placements.mem_type = TTM_PL_TT;
> - placements.flags = 0;
> - r = ttm_bo_mem_space(bo, &placement, &tmp_mem, ctx);
> - if (unlikely(r)) {
> - pr_err("Failed to find GTT space for blit to VRAM\n");
> - return r;
> - }
> -
> - /* move/bind old memory to GTT space */
> - r = ttm_tt_populate(bo->bdev, bo->ttm, ctx);
> - if (unlikely(r))
> - return r;
> -
> - r = amdgpu_ttm_backend_bind(bo->bdev, bo->ttm, &tmp_mem);
> - if (unlikely(r)) {
> - goto out_cleanup;
> - }
> -
> - ttm_bo_assign_mem(bo, &tmp_mem);
> - /* copy to VRAM */
> - r = amdgpu_move_blit(bo, evict, new_mem, old_mem);
> - if (unlikely(r)) {
> - goto out_cleanup;
> - }
> -out_cleanup:
> - ttm_resource_free(bo, &tmp_mem);
> - return r;
> -}
> -
> /**
> * amdgpu_mem_visible - Check that memory can be accessed by ttm_bo_move_memcpy
> *
> @@ -664,6 +551,17 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
> struct ttm_resource *old_mem = &bo->mem;
> int r;
>
> + if ((old_mem->mem_type == TTM_PL_SYSTEM &&
> + new_mem->mem_type == TTM_PL_VRAM) ||
> + (old_mem->mem_type == TTM_PL_VRAM &&
> + new_mem->mem_type == TTM_PL_SYSTEM)) {
> + hop->fpfn = 0;
> + hop->lpfn = 0;
> + hop->mem_type = TTM_PL_TT;
> + hop->flags = 0;
> + return -EMULTIHOP;
> + }
> +
> if (new_mem->mem_type == TTM_PL_TT) {
> r = amdgpu_ttm_backend_bind(bo->bdev, bo->ttm, new_mem);
> if (r)
> @@ -717,16 +615,8 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
> goto memcpy;
> }
>
> - if (old_mem->mem_type == TTM_PL_VRAM &&
> - new_mem->mem_type == TTM_PL_SYSTEM) {
> - r = amdgpu_move_vram_ram(bo, evict, ctx, new_mem);
> - } else if (old_mem->mem_type == TTM_PL_SYSTEM &&
> - new_mem->mem_type == TTM_PL_VRAM) {
> - r = amdgpu_move_ram_vram(bo, evict, ctx, new_mem);
> - } else {
> - r = amdgpu_move_blit(bo, evict,
> - new_mem, old_mem);
> - }
> + r = amdgpu_move_blit(bo, evict,
> + new_mem, old_mem);
>
> if (r) {
> memcpy:
> --
> 2.27.0
>
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