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 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;
148 if (&tbo->mem == mem)
149 tbo->offset = (tbo->mem.start << PAGE_SHIFT) +
150 tbo->bdev->man[tbo->mem.mem_type].gpu_offset;
157 * amdgpu_gtt_mgr_new - allocate a new node
159 * @man: TTM memory type manager
160 * @tbo: TTM BO we need this range for
161 * @place: placement flags and restrictions
162 * @mem: the resulting mem object
164 * Dummy, allocate the node but no space for it yet.
166 static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man,
167 struct ttm_buffer_object *tbo,
168 const struct ttm_place *place,
169 struct ttm_mem_reg *mem)
171 struct amdgpu_gtt_mgr *mgr = man->priv;
172 struct drm_mm_node *node;
175 spin_lock(&mgr->lock);
176 if (atomic64_read(&mgr->available) < mem->num_pages) {
177 spin_unlock(&mgr->lock);
180 atomic64_sub(mem->num_pages, &mgr->available);
181 spin_unlock(&mgr->lock);
183 node = kzalloc(sizeof(*node), GFP_KERNEL);
189 node->start = AMDGPU_BO_INVALID_OFFSET;
190 node->size = mem->num_pages;
193 if (place->fpfn || place->lpfn || place->flags & TTM_PL_FLAG_TOPDOWN) {
194 r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem);
202 mem->start = node->start;
207 atomic64_add(mem->num_pages, &mgr->available);
213 * amdgpu_gtt_mgr_del - free ranges
215 * @man: TTM memory type manager
216 * @tbo: TTM BO we need this range for
217 * @place: placement flags and restrictions
218 * @mem: TTM memory object
220 * Free the allocated GTT again.
222 static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man,
223 struct ttm_mem_reg *mem)
225 struct amdgpu_gtt_mgr *mgr = man->priv;
226 struct drm_mm_node *node = mem->mm_node;
231 spin_lock(&mgr->lock);
232 if (node->start != AMDGPU_BO_INVALID_OFFSET)
233 drm_mm_remove_node(node);
234 spin_unlock(&mgr->lock);
235 atomic64_add(mem->num_pages, &mgr->available);
242 * amdgpu_gtt_mgr_usage - return usage of GTT domain
244 * @man: TTM memory type manager
246 * Return how many bytes are used in the GTT domain
248 uint64_t amdgpu_gtt_mgr_usage(struct ttm_mem_type_manager *man)
250 struct amdgpu_gtt_mgr *mgr = man->priv;
252 return (u64)(man->size - atomic64_read(&mgr->available)) * PAGE_SIZE;
256 * amdgpu_gtt_mgr_debug - dump VRAM table
258 * @man: TTM memory type manager
259 * @printer: DRM printer to use
261 * Dump the table content using printk.
263 static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man,
264 struct drm_printer *printer)
266 struct amdgpu_gtt_mgr *mgr = man->priv;
268 spin_lock(&mgr->lock);
269 drm_mm_print(&mgr->mm, printer);
270 spin_unlock(&mgr->lock);
272 drm_printf(printer, "man size:%llu pages, gtt available:%llu pages, usage:%lluMB\n",
273 man->size, (u64)atomic64_read(&mgr->available),
274 amdgpu_gtt_mgr_usage(man) >> 20);
277 const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = {
278 .init = amdgpu_gtt_mgr_init,
279 .takedown = amdgpu_gtt_mgr_fini,
280 .get_node = amdgpu_gtt_mgr_new,
281 .put_node = amdgpu_gtt_mgr_del,
282 .debug = amdgpu_gtt_mgr_debug