diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c index 592a2dd16493..bce105e2973e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c @@ -25,6 +25,7 @@ #include <linux/dma-mapping.h> #include "amdgpu.h" #include "amdgpu_vm.h" +#include "amdgpu_res_cursor.h" #include "amdgpu_atomfirmware.h" #include "atom.h" @@ -565,6 +566,8 @@ static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man, * * @adev: amdgpu device pointer * @mem: TTM memory object + * @offset: byte offset from the base of VRAM BO + * @length: number of bytes to export in sg_table * @dev: the other device * @dir: dma direction * @sgt: resulting sg table @@ -573,39 +576,47 @@ static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man, */ int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev, struct ttm_resource *mem, + u64 offset, u64 length, struct device *dev, enum dma_data_direction dir, struct sg_table **sgt) { - struct drm_mm_node *node; + struct amdgpu_res_cursor cursor; struct scatterlist *sg; int num_entries = 0; - unsigned int pages; int i, r; *sgt = kmalloc(sizeof(**sgt), GFP_KERNEL); if (!*sgt) return -ENOMEM; - for (pages = mem->num_pages, node = mem->mm_node; - pages; pages -= node->size, ++node) - ++num_entries; + /* Determine the number of DRM_MM nodes to export */ + amdgpu_res_first(mem, offset, length, &cursor); + while (cursor.remaining) { + num_entries++; + amdgpu_res_next(&cursor, cursor.size); + } r = sg_alloc_table(*sgt, num_entries, GFP_KERNEL); if (r) goto error_free; + /* Initialize scatterlist nodes of sg_table */ for_each_sgtable_sg((*sgt), sg, i) sg->length = 0; - node = mem->mm_node; + /* + * Walk down DRM_MM nodes to populate scatterlist nodes + * @note: Use iterator api to get first the DRM_MM node + * and the number of bytes from it. Access the following + * DRM_MM node(s) if more buffer needs to exported + */ + amdgpu_res_first(mem, offset, length, &cursor); for_each_sgtable_sg((*sgt), sg, i) { - phys_addr_t phys = (node->start << PAGE_SHIFT) + - adev->gmc.aper_base; - size_t size = node->size << PAGE_SHIFT; + phys_addr_t phys = cursor.start + adev->gmc.aper_base; + size_t size = cursor.size; dma_addr_t addr; - ++node; addr = dma_map_resource(dev, phys, size, dir, DMA_ATTR_SKIP_CPU_SYNC); r = dma_mapping_error(dev, addr); @@ -615,7 +626,10 @@ int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev, sg_set_page(sg, NULL, size, 0); sg_dma_address(sg) = addr; sg_dma_len(sg) = size; + + amdgpu_res_next(&cursor, cursor.size); } + return 0; error_unmap: |