| // SPDX-License-Identifier: GPL-2.0 OR MIT |
| /* |
| * Copyright 2020 Advanced Micro Devices, Inc. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| * |
| * Authors: Christian König |
| */ |
| |
| #ifndef __AMDGPU_RES_CURSOR_H__ |
| #define __AMDGPU_RES_CURSOR_H__ |
| |
| #include <drm/drm_mm.h> |
| #include <drm/ttm/ttm_resource.h> |
| #include <drm/ttm/ttm_range_manager.h> |
| |
| /* state back for walking over vram_mgr and gtt_mgr allocations */ |
| struct amdgpu_res_cursor { |
| uint64_t start; |
| uint64_t size; |
| uint64_t remaining; |
| struct drm_mm_node *node; |
| }; |
| |
| /** |
| * amdgpu_res_first - initialize a amdgpu_res_cursor |
| * |
| * @res: TTM resource object to walk |
| * @start: Start of the range |
| * @size: Size of the range |
| * @cur: cursor object to initialize |
| * |
| * Start walking over the range of allocations between @start and @size. |
| */ |
| static inline void amdgpu_res_first(struct ttm_resource *res, |
| uint64_t start, uint64_t size, |
| struct amdgpu_res_cursor *cur) |
| { |
| struct drm_mm_node *node; |
| |
| if (!res || res->mem_type == TTM_PL_SYSTEM) { |
| cur->start = start; |
| cur->size = size; |
| cur->remaining = size; |
| cur->node = NULL; |
| WARN_ON(res && start + size > res->num_pages << PAGE_SHIFT); |
| return; |
| } |
| |
| BUG_ON(start + size > res->num_pages << PAGE_SHIFT); |
| |
| node = to_ttm_range_mgr_node(res)->mm_nodes; |
| while (start >= node->size << PAGE_SHIFT) |
| start -= node++->size << PAGE_SHIFT; |
| |
| cur->start = (node->start << PAGE_SHIFT) + start; |
| cur->size = min((node->size << PAGE_SHIFT) - start, size); |
| cur->remaining = size; |
| cur->node = node; |
| } |
| |
| /** |
| * amdgpu_res_next - advance the cursor |
| * |
| * @cur: the cursor to advance |
| * @size: number of bytes to move forward |
| * |
| * Move the cursor @size bytes forwrad, walking to the next node if necessary. |
| */ |
| static inline void amdgpu_res_next(struct amdgpu_res_cursor *cur, uint64_t size) |
| { |
| struct drm_mm_node *node = cur->node; |
| |
| BUG_ON(size > cur->remaining); |
| |
| cur->remaining -= size; |
| if (!cur->remaining) |
| return; |
| |
| cur->size -= size; |
| if (cur->size) { |
| cur->start += size; |
| return; |
| } |
| |
| cur->node = ++node; |
| cur->start = node->start << PAGE_SHIFT; |
| cur->size = min(node->size << PAGE_SHIFT, cur->remaining); |
| } |
| |
| #endif |