1 // SPDX-License-Identifier: GPL-2.0 OR MIT 2 /* 3 * Copyright 2020 Advanced Micro Devices, Inc. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be included in 13 * all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 21 * OTHER DEALINGS IN THE SOFTWARE. 22 * 23 * Authors: Christian König 24 */ 25 26 #ifndef __AMDGPU_RES_CURSOR_H__ 27 #define __AMDGPU_RES_CURSOR_H__ 28 29 #include <drm/drm_mm.h> 30 #include <drm/ttm/ttm_resource.h> 31 #include <drm/ttm/ttm_range_manager.h> 32 33 #include "amdgpu_vram_mgr.h" 34 35 /* state back for walking over vram_mgr and gtt_mgr allocations */ 36 struct amdgpu_res_cursor { 37 uint64_t start; 38 uint64_t size; 39 uint64_t remaining; 40 void *node; 41 uint32_t mem_type; 42 }; 43 44 /** 45 * amdgpu_res_first - initialize a amdgpu_res_cursor 46 * 47 * @res: TTM resource object to walk 48 * @start: Start of the range 49 * @size: Size of the range 50 * @cur: cursor object to initialize 51 * 52 * Start walking over the range of allocations between @start and @size. 53 */ 54 static inline void amdgpu_res_first(struct ttm_resource *res, 55 uint64_t start, uint64_t size, 56 struct amdgpu_res_cursor *cur) 57 { 58 struct drm_buddy_block *block; 59 struct list_head *head, *next; 60 struct drm_mm_node *node; 61 62 if (!res) 63 goto fallback; 64 65 BUG_ON(start + size > res->num_pages << PAGE_SHIFT); 66 67 cur->mem_type = res->mem_type; 68 69 switch (cur->mem_type) { 70 case TTM_PL_VRAM: 71 head = &to_amdgpu_vram_mgr_resource(res)->blocks; 72 73 block = list_first_entry_or_null(head, 74 struct drm_buddy_block, 75 link); 76 if (!block) 77 goto fallback; 78 79 while (start >= amdgpu_vram_mgr_block_size(block)) { 80 start -= amdgpu_vram_mgr_block_size(block); 81 82 next = block->link.next; 83 if (next != head) 84 block = list_entry(next, struct drm_buddy_block, link); 85 } 86 87 cur->start = amdgpu_vram_mgr_block_start(block) + start; 88 cur->size = min(amdgpu_vram_mgr_block_size(block) - start, size); 89 cur->remaining = size; 90 cur->node = block; 91 break; 92 case TTM_PL_TT: 93 node = to_ttm_range_mgr_node(res)->mm_nodes; 94 while (start >= node->size << PAGE_SHIFT) 95 start -= node++->size << PAGE_SHIFT; 96 97 cur->start = (node->start << PAGE_SHIFT) + start; 98 cur->size = min((node->size << PAGE_SHIFT) - start, size); 99 cur->remaining = size; 100 cur->node = node; 101 break; 102 default: 103 goto fallback; 104 } 105 106 return; 107 108 fallback: 109 cur->start = start; 110 cur->size = size; 111 cur->remaining = size; 112 cur->node = NULL; 113 WARN_ON(res && start + size > res->num_pages << PAGE_SHIFT); 114 return; 115 } 116 117 /** 118 * amdgpu_res_next - advance the cursor 119 * 120 * @cur: the cursor to advance 121 * @size: number of bytes to move forward 122 * 123 * Move the cursor @size bytes forwrad, walking to the next node if necessary. 124 */ 125 static inline void amdgpu_res_next(struct amdgpu_res_cursor *cur, uint64_t size) 126 { 127 struct drm_buddy_block *block; 128 struct drm_mm_node *node; 129 struct list_head *next; 130 131 BUG_ON(size > cur->remaining); 132 133 cur->remaining -= size; 134 if (!cur->remaining) 135 return; 136 137 cur->size -= size; 138 if (cur->size) { 139 cur->start += size; 140 return; 141 } 142 143 switch (cur->mem_type) { 144 case TTM_PL_VRAM: 145 block = cur->node; 146 147 next = block->link.next; 148 block = list_entry(next, struct drm_buddy_block, link); 149 150 cur->node = block; 151 cur->start = amdgpu_vram_mgr_block_start(block); 152 cur->size = min(amdgpu_vram_mgr_block_size(block), cur->remaining); 153 break; 154 case TTM_PL_TT: 155 node = cur->node; 156 157 cur->node = ++node; 158 cur->start = node->start << PAGE_SHIFT; 159 cur->size = min(node->size << PAGE_SHIFT, cur->remaining); 160 break; 161 default: 162 return; 163 } 164 } 165 166 #endif 167