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[PATCH] dma-buf: system_heap: Optimize sg_table-to-pages conversion in vmap

by Barry Song (Xiaomi)

From: Xueyuan Chen <Xueyuan.chen21(a)gmail.com> Replace the heavy for_each_sgtable_page() iterator in system_heap_do_vmap() with a more efficient nested loop approach. Instead of iterating page by page, we now iterate through the scatterlist entries via for_each_sgtable_sg(). Because pages within a single sg entry are physically contiguous, we can populate the page array with a in an inner loop using simple pointer math. This save a lot of time. The WARN_ON check is also pulled out of the loop to save branch instructions. Performance results mapping a 2GB buffer on Radxa O6: - Before: ~1440000 ns - After: ~232000 ns (~84% reduction in iteration time, or ~6.2x faster) Cc: Sumit Semwal <sumit.semwal(a)linaro.org> Cc: Benjamin Gaignard <benjamin.gaignard(a)collabora.com> Cc: Brian Starkey <Brian.Starkey(a)arm.com> Cc: John Stultz <jstultz(a)google.com> Cc: T.J. Mercier <tjmercier(a)google.com> Cc: Christian König <christian.koenig(a)amd.com> Signed-off-by: Xueyuan Chen <Xueyuan.chen21(a)gmail.com> Signed-off-by: Barry Song (Xiaomi) <baohua(a)kernel.org> --- drivers/dma-buf/heaps/system_heap.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c index b3650d8fd651..769f01f0cc96 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -224,16 +224,21 @@ static void *system_heap_do_vmap(struct system_heap_buffer *buffer) int npages = PAGE_ALIGN(buffer->len) / PAGE_SIZE; struct page **pages = vmalloc(sizeof(struct page *) * npages); struct page **tmp = pages; - struct sg_page_iter piter; void *vaddr; + u32 i, j, count; + struct page *base_page; + struct scatterlist *sg; if (!pages) return ERR_PTR(-ENOMEM); - for_each_sgtable_page(table, &piter, 0) { - WARN_ON(tmp - pages >= npages); - *tmp++ = sg_page_iter_page(&piter); + for_each_sgtable_sg(table, sg, i) { + base_page = sg_page(sg); + count = sg->length >> PAGE_SHIFT; + for (j = 0; j < count; j++) + *tmp++ = base_page + j; } + WARN_ON(tmp - pages != npages); vaddr = vmap(pages, npages, VM_MAP, PAGE_KERNEL); vfree(pages); -- 2.39.3 (Apple Git-146)

1 week, 6 days

[PATCH v5 6/7] drm/amdgpu: rename amdgpu_fill_buffer as amdgpu_ttm_clear_buffer

by Pierre-Eric Pelloux-Prayer

This is the only use case for this function. --- v2: amdgpu_ttm_clear_buffer instead of amdgpu_clear_buffer --- Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer(a)amd.com> Reviewed-by: Christian König <christian.koenig(a)amd.com> --- drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 12 +++++------ drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 23 ++++++++++------------ drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 13 ++++++------ 3 files changed, 22 insertions(+), 26 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c index d0884bbffa75..195cb1c814d1 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c @@ -717,9 +717,9 @@ int amdgpu_bo_create(struct amdgpu_device *adev, bo->tbo.resource->mem_type == TTM_PL_VRAM) { struct dma_fence *fence; - r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev), - bo, 0, NULL, &fence, - true, AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER); + r = amdgpu_ttm_clear_buffer(amdgpu_ttm_next_clear_entity(adev), + bo, NULL, &fence, + true, AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER); if (unlikely(r)) goto fail_unreserve; @@ -1329,9 +1329,9 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo) if (r) goto out; - r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev), - abo, 0, &bo->base._resv, &fence, - false, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE); + r = amdgpu_ttm_clear_buffer(amdgpu_ttm_next_clear_entity(adev), + abo, &bo->base._resv, &fence, + false, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE); if (WARN_ON(r)) goto out; diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index a3d0998b8cec..e74f9f8a88dc 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -417,8 +417,8 @@ static int amdgpu_move_blit(struct ttm_buffer_object *bo, if (old_mem->mem_type == TTM_PL_VRAM && (abo->flags & AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE)) { struct dma_fence *wipe_fence = NULL; - r = amdgpu_fill_buffer(entity, abo, 0, NULL, &wipe_fence, - false, AMDGPU_KERNEL_JOB_ID_MOVE_BLIT); + r = amdgpu_ttm_clear_buffer(entity, abo, NULL, &wipe_fence, + false, AMDGPU_KERNEL_JOB_ID_MOVE_BLIT); if (r) { goto error; } else if (wipe_fence) { @@ -2572,26 +2572,23 @@ static int amdgpu_ttm_fill_mem(struct amdgpu_device *adev, } /** - * amdgpu_fill_buffer - fill a buffer with a given value + * amdgpu_ttm_clear_buffer - fill a buffer with 0 * @entity: entity to use * @bo: the bo to fill - * @src_data: the value to set * @resv: fences contained in this reservation will be used as dependencies. * @out_fence: the fence from the last clear will be stored here. It might be * NULL if no job was run. - * @dependency: optional input dependency fence. * @consider_clear_status: true if region reported as cleared by amdgpu_res_cleared() * are skipped. * @k_job_id: trace id * */ -int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity, - struct amdgpu_bo *bo, - uint32_t src_data, - struct dma_resv *resv, - struct dma_fence **out_fence, - bool consider_clear_status, - u64 k_job_id) +int amdgpu_ttm_clear_buffer(struct amdgpu_ttm_buffer_entity *entity, + struct amdgpu_bo *bo, + struct dma_resv *resv, + struct dma_fence **out_fence, + bool consider_clear_status, + u64 k_job_id) { struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); struct dma_fence *fence = NULL; @@ -2622,7 +2619,7 @@ int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity, goto error; r = amdgpu_ttm_fill_mem(adev, entity, - src_data, to, cur_size, resv, + 0, to, cur_size, resv, &next, true, k_job_id); if (r) goto error; diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h index 436a3e09a178..d7b14d5cac77 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h @@ -187,13 +187,12 @@ int amdgpu_copy_buffer(struct amdgpu_device *adev, struct dma_resv *resv, struct dma_fence **fence, bool vm_needs_flush, uint32_t copy_flags); -int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity, - struct amdgpu_bo *bo, - uint32_t src_data, - struct dma_resv *resv, - struct dma_fence **out_fence, - bool consider_clear_status, - u64 k_job_id); +int amdgpu_ttm_clear_buffer(struct amdgpu_ttm_buffer_entity *entity, + struct amdgpu_bo *bo, + struct dma_resv *resv, + struct dma_fence **out_fence, + bool consider_clear_status, + u64 k_job_id); struct amdgpu_ttm_buffer_entity *amdgpu_ttm_next_clear_entity(struct amdgpu_device *adev); int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo); -- 2.43.0

1 week, 6 days

[PATCH v5 5/7] drm/amdgpu: get rid of amdgpu_ttm_clear_buffer

by Pierre-Eric Pelloux-Prayer

It's doing the same thing as amdgpu_fill_buffer(src_data=0), so drop it. The only caveat is that amdgpu_res_cleared() return value is only valid right after allocation. --- v2: introduce new "bool consider_clear_status" arg --- Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer(a)amd.com> --- drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 16 ++-- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 88 +++++----------------- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 6 +- 3 files changed, 32 insertions(+), 78 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c index 66c20dd46d12..d0884bbffa75 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c @@ -717,13 +717,17 @@ int amdgpu_bo_create(struct amdgpu_device *adev, bo->tbo.resource->mem_type == TTM_PL_VRAM) { struct dma_fence *fence; - r = amdgpu_ttm_clear_buffer(bo, bo->tbo.base.resv, &fence); + r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev), + bo, 0, NULL, &fence, + true, AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER); if (unlikely(r)) goto fail_unreserve; - dma_resv_add_fence(bo->tbo.base.resv, fence, - DMA_RESV_USAGE_KERNEL); - dma_fence_put(fence); + if (fence) { + dma_resv_add_fence(bo->tbo.base.resv, fence, + DMA_RESV_USAGE_KERNEL); + dma_fence_put(fence); + } } if (!bp->resv) amdgpu_bo_unreserve(bo); @@ -1326,8 +1330,8 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo) goto out; r = amdgpu_fill_buffer(amdgpu_ttm_next_clear_entity(adev), - abo, 0, &bo->base._resv, - &fence, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE); + abo, 0, &bo->base._resv, &fence, + false, AMDGPU_KERNEL_JOB_ID_CLEAR_ON_RELEASE); if (WARN_ON(r)) goto out; diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index 648ad344e89c..a3d0998b8cec 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -418,7 +418,7 @@ static int amdgpu_move_blit(struct ttm_buffer_object *bo, (abo->flags & AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE)) { struct dma_fence *wipe_fence = NULL; r = amdgpu_fill_buffer(entity, abo, 0, NULL, &wipe_fence, - AMDGPU_KERNEL_JOB_ID_MOVE_BLIT); + false, AMDGPU_KERNEL_JOB_ID_MOVE_BLIT); if (r) { goto error; } else if (wipe_fence) { @@ -2572,76 +2572,25 @@ static int amdgpu_ttm_fill_mem(struct amdgpu_device *adev, } /** - * amdgpu_ttm_clear_buffer - clear memory buffers - * @bo: amdgpu buffer object - * @resv: reservation object - * @fence: dma_fence associated with the operation + * amdgpu_fill_buffer - fill a buffer with a given value + * @entity: entity to use + * @bo: the bo to fill + * @src_data: the value to set + * @resv: fences contained in this reservation will be used as dependencies. + * @out_fence: the fence from the last clear will be stored here. It might be + * NULL if no job was run. + * @dependency: optional input dependency fence. + * @consider_clear_status: true if region reported as cleared by amdgpu_res_cleared() + * are skipped. + * @k_job_id: trace id * - * Clear the memory buffer resource. - * - * Returns: - * 0 for success or a negative error code on failure. */ -int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo, - struct dma_resv *resv, - struct dma_fence **fence) -{ - struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); - struct amdgpu_ttm_buffer_entity *entity; - struct amdgpu_res_cursor cursor; - u64 addr; - int r = 0; - - if (!adev->mman.buffer_funcs_enabled) - return -EINVAL; - - if (!fence) - return -EINVAL; - entity = &adev->mman.clear_entities[0]; - *fence = dma_fence_get_stub(); - - amdgpu_res_first(bo->tbo.resource, 0, amdgpu_bo_size(bo), &cursor); - - mutex_lock(&entity->lock); - while (cursor.remaining) { - struct dma_fence *next = NULL; - u64 size; - - if (amdgpu_res_cleared(&cursor)) { - amdgpu_res_next(&cursor, cursor.size); - continue; - } - - /* Never clear more than 256MiB at once to avoid timeouts */ - size = min(cursor.size, 256ULL << 20); - - r = amdgpu_ttm_map_buffer(entity, &bo->tbo, bo->tbo.resource, &cursor, - 0, false, &size, &addr); - if (r) - goto err; - - r = amdgpu_ttm_fill_mem(adev, entity, 0, addr, size, resv, - &next, true, - AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER); - if (r) - goto err; - - dma_fence_put(*fence); - *fence = next; - - amdgpu_res_next(&cursor, size); - } -err: - mutex_unlock(&entity->lock); - - return r; -} - int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity, struct amdgpu_bo *bo, uint32_t src_data, struct dma_resv *resv, - struct dma_fence **f, + struct dma_fence **out_fence, + bool consider_clear_status, u64 k_job_id) { struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); @@ -2659,6 +2608,11 @@ int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity, struct dma_fence *next; uint64_t cur_size, to; + if (consider_clear_status && amdgpu_res_cleared(&dst)) { + amdgpu_res_next(&dst, dst.size); + continue; + } + /* Never fill more than 256MiB at once to avoid timeouts */ cur_size = min(dst.size, 256ULL << 20); @@ -2680,9 +2634,7 @@ int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity, } error: mutex_unlock(&entity->lock); - if (f) - *f = dma_fence_get(fence); - dma_fence_put(fence); + *out_fence = fence; return r; } diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h index a6249252948b..436a3e09a178 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h @@ -187,14 +187,12 @@ int amdgpu_copy_buffer(struct amdgpu_device *adev, struct dma_resv *resv, struct dma_fence **fence, bool vm_needs_flush, uint32_t copy_flags); -int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo, - struct dma_resv *resv, - struct dma_fence **fence); int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity, struct amdgpu_bo *bo, uint32_t src_data, struct dma_resv *resv, - struct dma_fence **f, + struct dma_fence **out_fence, + bool consider_clear_status, u64 k_job_id); struct amdgpu_ttm_buffer_entity *amdgpu_ttm_next_clear_entity(struct amdgpu_device *adev); -- 2.43.0

1 week, 6 days

[PATCH] dma-buf: heaps: system: document system_cc_shared heap

by Jiri Pirko

From: Jiri Pirko <jiri(a)nvidia.com> Document the system_cc_shared dma-buf heap that was introduced recently. Describe its purpose, availability conditions and relation to confidential computing VMs. Signed-off-by: Jiri Pirko <jiri(a)nvidia.com> --- Documentation/userspace-api/dma-buf-heaps.rst | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/userspace-api/dma-buf-heaps.rst b/Documentation/userspace-api/dma-buf-heaps.rst index 05445c83b79a..591732393e7d 100644 --- a/Documentation/userspace-api/dma-buf-heaps.rst +++ b/Documentation/userspace-api/dma-buf-heaps.rst @@ -16,6 +16,14 @@ following heaps: - The ``system`` heap allocates virtually contiguous, cacheable, buffers. + - The ``system_cc_shared`` heap allocates virtually contiguous, cacheable, + buffers using shared (decrypted) memory. It is only present on + confidential computing (CoCo) VMs where memory encryption is active + (e.g., AMD SEV, Intel TDX). The allocated pages have the encryption + bit cleared, making them accessible for device DMA without TDISP + support. On non-CoCo VMs configurations, this heap is + not registered. + - The ``default_cma_region`` heap allocates physically contiguous, cacheable, buffers. Only present if a CMA region is present. Such a region is usually created either through the kernel commandline -- 2.51.1

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