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_vram_mgr {
36 * amdgpu_vram_mgr_init - init VRAM manager and DRM MM
38 * @man: TTM memory type manager
39 * @p_size: maximum size of VRAM
41 * Allocate and initialize the VRAM manager.
43 static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
46 struct amdgpu_vram_mgr *mgr;
48 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
52 drm_mm_init(&mgr->mm, 0, p_size);
53 spin_lock_init(&mgr->lock);
59 * amdgpu_vram_mgr_fini - free and destroy VRAM manager
61 * @man: TTM memory type manager
63 * Destroy and free the VRAM manager, returns -EBUSY if ranges are still
64 * allocated inside it.
66 static int amdgpu_vram_mgr_fini(struct ttm_mem_type_manager *man)
68 struct amdgpu_vram_mgr *mgr = man->priv;
70 spin_lock(&mgr->lock);
71 drm_mm_takedown(&mgr->mm);
72 spin_unlock(&mgr->lock);
79 * amdgpu_vram_mgr_vis_size - Calculate visible node size
81 * @adev: amdgpu device structure
82 * @node: MM node structure
84 * Calculate how many bytes of the MM node are inside visible VRAM
86 static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev,
87 struct drm_mm_node *node)
89 uint64_t start = node->start << PAGE_SHIFT;
90 uint64_t end = (node->size + node->start) << PAGE_SHIFT;
92 if (start >= adev->mc.visible_vram_size)
95 return (end > adev->mc.visible_vram_size ?
96 adev->mc.visible_vram_size : end) - start;
100 * amdgpu_vram_mgr_new - allocate new ranges
102 * @man: TTM memory type manager
103 * @tbo: TTM BO we need this range for
104 * @place: placement flags and restrictions
105 * @mem: the resulting mem object
107 * Allocate VRAM for the given BO.
109 static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
110 struct ttm_buffer_object *tbo,
111 const struct ttm_place *place,
112 struct ttm_mem_reg *mem)
114 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
115 struct amdgpu_vram_mgr *mgr = man->priv;
116 struct drm_mm *mm = &mgr->mm;
117 struct drm_mm_node *nodes;
118 enum drm_mm_insert_mode mode;
119 unsigned long lpfn, num_nodes, pages_per_node, pages_left;
120 uint64_t usage = 0, vis_usage = 0;
128 if (place->flags & TTM_PL_FLAG_CONTIGUOUS ||
129 amdgpu_vram_page_split == -1) {
130 pages_per_node = ~0ul;
133 pages_per_node = max((uint32_t)amdgpu_vram_page_split,
134 mem->page_alignment);
135 num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node);
138 nodes = kcalloc(num_nodes, sizeof(*nodes), GFP_KERNEL);
142 mode = DRM_MM_INSERT_BEST;
143 if (place->flags & TTM_PL_FLAG_TOPDOWN)
144 mode = DRM_MM_INSERT_HIGH;
147 pages_left = mem->num_pages;
149 spin_lock(&mgr->lock);
150 for (i = 0; i < num_nodes; ++i) {
151 unsigned long pages = min(pages_left, pages_per_node);
152 uint32_t alignment = mem->page_alignment;
155 if (pages == pages_per_node)
156 alignment = pages_per_node;
158 r = drm_mm_insert_node_in_range(mm, &nodes[i],
165 usage += nodes[i].size << PAGE_SHIFT;
166 vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
168 /* Calculate a virtual BO start address to easily check if
169 * everything is CPU accessible.
171 start = nodes[i].start + nodes[i].size;
172 if (start > mem->num_pages)
173 start -= mem->num_pages;
176 mem->start = max(mem->start, start);
179 spin_unlock(&mgr->lock);
181 atomic64_add(usage, &mgr->usage);
182 atomic64_add(vis_usage, &mgr->vis_usage);
184 mem->mm_node = nodes;
190 drm_mm_remove_node(&nodes[i]);
191 spin_unlock(&mgr->lock);
194 return r == -ENOSPC ? 0 : r;
198 * amdgpu_vram_mgr_del - free ranges
200 * @man: TTM memory type manager
201 * @tbo: TTM BO we need this range for
202 * @place: placement flags and restrictions
203 * @mem: TTM memory object
205 * Free the allocated VRAM again.
207 static void amdgpu_vram_mgr_del(struct ttm_mem_type_manager *man,
208 struct ttm_mem_reg *mem)
210 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
211 struct amdgpu_vram_mgr *mgr = man->priv;
212 struct drm_mm_node *nodes = mem->mm_node;
213 uint64_t usage = 0, vis_usage = 0;
214 unsigned pages = mem->num_pages;
219 spin_lock(&mgr->lock);
221 pages -= nodes->size;
222 drm_mm_remove_node(nodes);
223 usage += nodes->size << PAGE_SHIFT;
224 vis_usage += amdgpu_vram_mgr_vis_size(adev, nodes);
227 spin_unlock(&mgr->lock);
229 atomic64_sub(usage, &mgr->usage);
230 atomic64_sub(vis_usage, &mgr->vis_usage);
237 * amdgpu_vram_mgr_usage - how many bytes are used in this domain
239 * @man: TTM memory type manager
241 * Returns how many bytes are used in this domain.
243 uint64_t amdgpu_vram_mgr_usage(struct ttm_mem_type_manager *man)
245 struct amdgpu_vram_mgr *mgr = man->priv;
247 return atomic64_read(&mgr->usage);
251 * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part
253 * @man: TTM memory type manager
255 * Returns how many bytes are used in the visible part of VRAM
257 uint64_t amdgpu_vram_mgr_vis_usage(struct ttm_mem_type_manager *man)
259 struct amdgpu_vram_mgr *mgr = man->priv;
261 return atomic64_read(&mgr->vis_usage);
265 * amdgpu_vram_mgr_debug - dump VRAM table
267 * @man: TTM memory type manager
268 * @printer: DRM printer to use
270 * Dump the table content using printk.
272 static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man,
273 struct drm_printer *printer)
275 struct amdgpu_vram_mgr *mgr = man->priv;
277 spin_lock(&mgr->lock);
278 drm_mm_print(&mgr->mm, printer);
279 spin_unlock(&mgr->lock);
281 drm_printf(printer, "man size:%llu pages, ram usage:%lluMB, vis usage:%lluMB\n",
282 man->size, amdgpu_vram_mgr_usage(man) >> 20,
283 amdgpu_vram_mgr_vis_usage(man) >> 20);
286 const struct ttm_mem_type_manager_func amdgpu_vram_mgr_func = {
287 .init = amdgpu_vram_mgr_init,
288 .takedown = amdgpu_vram_mgr_fini,
289 .get_node = amdgpu_vram_mgr_new,
290 .put_node = amdgpu_vram_mgr_del,
291 .debug = amdgpu_vram_mgr_debug