drm/amdgpu: Implement ttm_bo_driver.access_memory callback v2 (e342610c) · Commits · 戴 / test

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

+62 −0

Original line number	Diff line number	Diff line
		@@ -1115,6 +1115,67 @@ static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
		return ttm_bo_eviction_valuable(bo, place);
		}

		static int amdgpu_ttm_access_memory(struct ttm_buffer_object *bo,
		unsigned long offset,
		void *buf, int len, int write)
		{
		struct amdgpu_bo *abo = container_of(bo, struct amdgpu_bo, tbo);
		struct amdgpu_device *adev = amdgpu_ttm_adev(abo->tbo.bdev);
		struct drm_mm_node *nodes = abo->tbo.mem.mm_node;
		uint32_t value = 0;
		int ret = 0;
		uint64_t pos;
		unsigned long flags;

		if (bo->mem.mem_type != TTM_PL_VRAM)
		return -EIO;

		while (offset >= (nodes->size << PAGE_SHIFT)) {
		offset -= nodes->size << PAGE_SHIFT;
		++nodes;
		}
		pos = (nodes->start << PAGE_SHIFT) + offset;

		while (len && pos < adev->mc.mc_vram_size) {
		uint64_t aligned_pos = pos & ~(uint64_t)3;
		uint32_t bytes = 4 - (pos & 3);
		uint32_t shift = (pos & 3) * 8;
		uint32_t mask = 0xffffffff << shift;

		if (len < bytes) {
		mask &= 0xffffffff >> (bytes - len) * 8;
		bytes = len;
		}

		spin_lock_irqsave(&adev->mmio_idx_lock, flags);
		WREG32(mmMM_INDEX, ((uint32_t)aligned_pos) \| 0x80000000);
		WREG32(mmMM_INDEX_HI, aligned_pos >> 31);
		if (!write \|\| mask != 0xffffffff)
		value = RREG32(mmMM_DATA);
		if (write) {
		value &= ~mask;
		value \|= ((uint32_t )buf << shift) & mask;
		WREG32(mmMM_DATA, value);
		}
		spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
		if (!write) {
		value = (value & mask) >> shift;
		memcpy(buf, &value, bytes);
		}

		ret += bytes;
		buf = (uint8_t *)buf + bytes;
		pos += bytes;
		len -= bytes;
		if (pos >= (nodes->start + nodes->size) << PAGE_SHIFT) {
		++nodes;
		pos = (nodes->start << PAGE_SHIFT);
		}
		}

		return ret;
		}

		static struct ttm_bo_driver amdgpu_bo_driver = {
		.ttm_tt_create = &amdgpu_ttm_tt_create,
		.ttm_tt_populate = &amdgpu_ttm_tt_populate,
		@@ -1130,6 +1191,7 @@ static struct ttm_bo_driver amdgpu_bo_driver = {
		.io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
		.io_mem_free = &amdgpu_ttm_io_mem_free,
		.io_mem_pfn = amdgpu_ttm_io_mem_pfn,
		.access_memory = &amdgpu_ttm_access_memory
		};

		int amdgpu_ttm_init(struct amdgpu_device *adev)

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