2 * Copyright 2016 Advanced Micro Devices, Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
22 * Authors: Christian König
28 struct amdgpu_gtt_mgr {
35 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
37 * @man: TTM memory type manager
38 * @p_size: maximum size of GTT
40 * Allocate and initialize the GTT manager.
42 static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
45 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
46 struct amdgpu_gtt_mgr *mgr;
49 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
53 start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
54 size = (adev->mc.gart_size >> PAGE_SHIFT) - start;
55 drm_mm_init(&mgr->mm, start, size);
56 spin_lock_init(&mgr->lock);
57 atomic64_set(&mgr->available, p_size);
63 * amdgpu_gtt_mgr_fini - free and destroy GTT manager
65 * @man: TTM memory type manager
67 * Destroy and free the GTT manager, returns -EBUSY if ranges are still
68 * allocated inside it.
70 static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man)
72 struct amdgpu_gtt_mgr *mgr = man->priv;
74 spin_lock(&mgr->lock);
75 if (!drm_mm_clean(&mgr->mm)) {
76 spin_unlock(&mgr->lock);
80 drm_mm_takedown(&mgr->mm);
81 spin_unlock(&mgr->lock);
88 * amdgpu_gtt_mgr_is_allocated - Check if mem has address space
90 * @mem: the mem object to check
92 * Check if a mem object has already address space allocated.
94 bool amdgpu_gtt_mgr_is_allocated(struct ttm_mem_reg *mem)
96 struct drm_mm_node *node = mem->mm_node;
98 return (node->start != AMDGPU_BO_INVALID_OFFSET);
102 * amdgpu_gtt_mgr_alloc - allocate new ranges
104 * @man: TTM memory type manager
105 * @tbo: TTM BO we need this range for
106 * @place: placement flags and restrictions
107 * @mem: the resulting mem object
109 * Allocate the address space for a node.
111 static int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
112 struct ttm_buffer_object *tbo,
113 const struct ttm_place *place,
114 struct ttm_mem_reg *mem)
116 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
117 struct amdgpu_gtt_mgr *mgr = man->priv;
118 struct drm_mm_node *node = mem->mm_node;
119 enum drm_mm_insert_mode mode;
120 unsigned long fpfn, lpfn;
123 if (amdgpu_gtt_mgr_is_allocated(mem))
131 if (place && place->lpfn)
134 lpfn = adev->gart.num_cpu_pages;
136 mode = DRM_MM_INSERT_BEST;
137 if (place && place->flags & TTM_PL_FLAG_TOPDOWN)
138 mode = DRM_MM_INSERT_HIGH;
140 spin_lock(&mgr->lock);
141 r = drm_mm_insert_node_in_range(&mgr->mm, node,
142 mem->num_pages, mem->page_alignment, 0,
144 spin_unlock(&mgr->lock);
147 mem->start = node->start;
153 * amdgpu_gtt_mgr_new - allocate a new node
155 * @man: TTM memory type manager
156 * @tbo: TTM BO we need this range for
157 * @place: placement flags and restrictions
158 * @mem: the resulting mem object
160 * Dummy, allocate the node but no space for it yet.
162 static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man,
163 struct ttm_buffer_object *tbo,
164 const struct ttm_place *place,
165 struct ttm_mem_reg *mem)
167 struct amdgpu_gtt_mgr *mgr = man->priv;
168 struct drm_mm_node *node;
171 spin_lock(&mgr->lock);
172 if (atomic64_read(&mgr->available) < mem->num_pages) {
173 spin_unlock(&mgr->lock);
176 atomic64_sub(mem->num_pages, &mgr->available);
177 spin_unlock(&mgr->lock);
179 node = kzalloc(sizeof(*node), GFP_KERNEL);
185 node->start = AMDGPU_BO_INVALID_OFFSET;
186 node->size = mem->num_pages;
189 if (place->fpfn || place->lpfn || place->flags & TTM_PL_FLAG_TOPDOWN) {
190 r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem);
198 mem->start = node->start;
203 atomic64_add(mem->num_pages, &mgr->available);
209 * amdgpu_gtt_mgr_del - free ranges
211 * @man: TTM memory type manager
212 * @tbo: TTM BO we need this range for
213 * @place: placement flags and restrictions
214 * @mem: TTM memory object
216 * Free the allocated GTT again.
218 static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man,
219 struct ttm_mem_reg *mem)
221 struct amdgpu_gtt_mgr *mgr = man->priv;
222 struct drm_mm_node *node = mem->mm_node;
227 spin_lock(&mgr->lock);
228 if (node->start != AMDGPU_BO_INVALID_OFFSET)
229 drm_mm_remove_node(node);
230 spin_unlock(&mgr->lock);
231 atomic64_add(mem->num_pages, &mgr->available);
238 * amdgpu_gtt_mgr_usage - return usage of GTT domain
240 * @man: TTM memory type manager
242 * Return how many bytes are used in the GTT domain
244 uint64_t amdgpu_gtt_mgr_usage(struct ttm_mem_type_manager *man)
246 struct amdgpu_gtt_mgr *mgr = man->priv;
248 return (u64)(man->size - atomic64_read(&mgr->available)) * PAGE_SIZE;
252 * amdgpu_gtt_mgr_debug - dump VRAM table
254 * @man: TTM memory type manager
255 * @printer: DRM printer to use
257 * Dump the table content using printk.
259 static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man,
260 struct drm_printer *printer)
262 struct amdgpu_gtt_mgr *mgr = man->priv;
264 spin_lock(&mgr->lock);
265 drm_mm_print(&mgr->mm, printer);
266 spin_unlock(&mgr->lock);
268 drm_printf(printer, "man size:%llu pages, gtt available:%llu pages, usage:%lluMB\n",
269 man->size, (u64)atomic64_read(&mgr->available),
270 amdgpu_gtt_mgr_usage(man) >> 20);
273 const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = {
274 .init = amdgpu_gtt_mgr_init,
275 .takedown = amdgpu_gtt_mgr_fini,
276 .get_node = amdgpu_gtt_mgr_new,
277 .put_node = amdgpu_gtt_mgr_del,
278 .debug = amdgpu_gtt_mgr_debug