From 9ae587f850a6702428273fcf4a2a9b392349b2a3 Mon Sep 17 00:00:00 2001 From: Arunpravin Paneer Selvam Date: Mon, 30 Oct 2023 09:25:37 -0700 Subject: drm/amdgpu: Fix the vram base start address MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit If the size returned by drm buddy allocator is higher than the required size, we take the higher size to calculate the buffer start address. This is required if we couldn't trim the buffer to the requested size. This will fix the display corruption issue on APU's which has limited VRAM size. Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2859 Fixes: 0a1844bf0b53 ("drm/buddy: Improve contiguous memory allocation") Signed-off-by: Arunpravin Paneer Selvam Acked-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c') diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c index 18f58efc9dc7..08916538a615 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c @@ -77,7 +77,16 @@ static inline bool amdgpu_is_vram_mgr_blocks_contiguous(struct list_head *head) return true; } +static inline u64 amdgpu_vram_mgr_blocks_size(struct list_head *head) +{ + struct drm_buddy_block *block; + u64 size = 0; + list_for_each_entry(block, head, link) + size += amdgpu_vram_mgr_block_size(block); + + return size; +} /** * DOC: mem_info_vram_total @@ -516,6 +525,8 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, mutex_unlock(&mgr->lock); vres->base.start = 0; + size = max_t(u64, amdgpu_vram_mgr_blocks_size(&vres->blocks), + vres->base.size); list_for_each_entry(block, &vres->blocks, link) { unsigned long start; @@ -523,8 +534,8 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man, amdgpu_vram_mgr_block_size(block); start >>= PAGE_SHIFT; - if (start > PFN_UP(vres->base.size)) - start -= PFN_UP(vres->base.size); + if (start > PFN_UP(size)) + start -= PFN_UP(size); else start = 0; vres->base.start = max(vres->base.start, start); -- cgit v1.2.3-70-g09d2