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 drm_mm_takedown(&mgr->mm);
75 spin_unlock(&mgr->lock);
82 * amdgpu_gtt_mgr_is_allocated - Check if mem has address space
84 * @mem: the mem object to check
86 * Check if a mem object has already address space allocated.
88 bool amdgpu_gtt_mgr_is_allocated(struct ttm_mem_reg *mem)
90 struct drm_mm_node *node = mem->mm_node;
92 return (node->start != AMDGPU_BO_INVALID_OFFSET);
96 * amdgpu_gtt_mgr_alloc - allocate new ranges
98 * @man: TTM memory type manager
99 * @tbo: TTM BO we need this range for
100 * @place: placement flags and restrictions
101 * @mem: the resulting mem object
103 * Allocate the address space for a node.
105 static int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
106 struct ttm_buffer_object *tbo,
107 const struct ttm_place *place,
108 struct ttm_mem_reg *mem)
110 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
111 struct amdgpu_gtt_mgr *mgr = man->priv;
112 struct drm_mm_node *node = mem->mm_node;
113 enum drm_mm_insert_mode mode;
114 unsigned long fpfn, lpfn;
117 if (amdgpu_gtt_mgr_is_allocated(mem))
125 if (place && place->lpfn)
128 lpfn = adev->gart.num_cpu_pages;
130 mode = DRM_MM_INSERT_BEST;
131 if (place && place->flags & TTM_PL_FLAG_TOPDOWN)
132 mode = DRM_MM_INSERT_HIGH;
134 spin_lock(&mgr->lock);
135 r = drm_mm_insert_node_in_range(&mgr->mm, node,
136 mem->num_pages, mem->page_alignment, 0,
138 spin_unlock(&mgr->lock);
141 mem->start = node->start;
147 * amdgpu_gtt_mgr_new - allocate a new node
149 * @man: TTM memory type manager
150 * @tbo: TTM BO we need this range for
151 * @place: placement flags and restrictions
152 * @mem: the resulting mem object
154 * Dummy, allocate the node but no space for it yet.
156 static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man,
157 struct ttm_buffer_object *tbo,
158 const struct ttm_place *place,
159 struct ttm_mem_reg *mem)
161 struct amdgpu_gtt_mgr *mgr = man->priv;
162 struct drm_mm_node *node;
165 spin_lock(&mgr->lock);
166 if ((&tbo->mem == mem || tbo->mem.mem_type != TTM_PL_TT) &&
167 atomic64_read(&mgr->available) < mem->num_pages) {
168 spin_unlock(&mgr->lock);
171 atomic64_sub(mem->num_pages, &mgr->available);
172 spin_unlock(&mgr->lock);
174 node = kzalloc(sizeof(*node), GFP_KERNEL);
180 node->start = AMDGPU_BO_INVALID_OFFSET;
181 node->size = mem->num_pages;
184 if (place->fpfn || place->lpfn || place->flags & TTM_PL_FLAG_TOPDOWN) {
185 r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem);
193 mem->start = node->start;
198 atomic64_add(mem->num_pages, &mgr->available);
204 * amdgpu_gtt_mgr_del - free ranges
206 * @man: TTM memory type manager
207 * @tbo: TTM BO we need this range for
208 * @place: placement flags and restrictions
209 * @mem: TTM memory object
211 * Free the allocated GTT again.
213 static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man,
214 struct ttm_mem_reg *mem)
216 struct amdgpu_gtt_mgr *mgr = man->priv;
217 struct drm_mm_node *node = mem->mm_node;
222 spin_lock(&mgr->lock);
223 if (node->start != AMDGPU_BO_INVALID_OFFSET)
224 drm_mm_remove_node(node);
225 spin_unlock(&mgr->lock);
226 atomic64_add(mem->num_pages, &mgr->available);
233 * amdgpu_gtt_mgr_usage - return usage of GTT domain
235 * @man: TTM memory type manager
237 * Return how many bytes are used in the GTT domain
239 uint64_t amdgpu_gtt_mgr_usage(struct ttm_mem_type_manager *man)
241 struct amdgpu_gtt_mgr *mgr = man->priv;
242 s64 result = man->size - atomic64_read(&mgr->available);
244 return (result > 0 ? result : 0) * PAGE_SIZE;
248 * amdgpu_gtt_mgr_debug - dump VRAM table
250 * @man: TTM memory type manager
251 * @printer: DRM printer to use
253 * Dump the table content using printk.
255 static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man,
256 struct drm_printer *printer)
258 struct amdgpu_gtt_mgr *mgr = man->priv;
260 spin_lock(&mgr->lock);
261 drm_mm_print(&mgr->mm, printer);
262 spin_unlock(&mgr->lock);
264 drm_printf(printer, "man size:%llu pages, gtt available:%lld pages, usage:%lluMB\n",
265 man->size, (u64)atomic64_read(&mgr->available),
266 amdgpu_gtt_mgr_usage(man) >> 20);
269 const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = {
270 .init = amdgpu_gtt_mgr_init,
271 .takedown = amdgpu_gtt_mgr_fini,
272 .get_node = amdgpu_gtt_mgr_new,
273 .put_node = amdgpu_gtt_mgr_del,
274 .debug = amdgpu_gtt_mgr_debug