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_gtt_mgr *mgr;
47 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
51 drm_mm_init(&mgr->mm, 0, p_size);
52 spin_lock_init(&mgr->lock);
53 mgr->available = p_size;
59 * amdgpu_gtt_mgr_fini - free and destroy GTT manager
61 * @man: TTM memory type manager
63 * Destroy and free the GTT manager, returns -EBUSY if ranges are still
64 * allocated inside it.
66 static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man)
68 struct amdgpu_gtt_mgr *mgr = man->priv;
70 spin_lock(&mgr->lock);
71 if (!drm_mm_clean(&mgr->mm)) {
72 spin_unlock(&mgr->lock);
76 drm_mm_takedown(&mgr->mm);
77 spin_unlock(&mgr->lock);
84 * amdgpu_gtt_mgr_alloc - allocate new ranges
86 * @man: TTM memory type manager
87 * @tbo: TTM BO we need this range for
88 * @place: placement flags and restrictions
89 * @mem: the resulting mem object
91 * Allocate the address space for a node.
93 int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
94 struct ttm_buffer_object *tbo,
95 const struct ttm_place *place,
96 struct ttm_mem_reg *mem)
98 struct amdgpu_gtt_mgr *mgr = man->priv;
99 struct drm_mm_node *node = mem->mm_node;
100 enum drm_mm_insert_mode mode;
101 unsigned long fpfn, lpfn;
104 if (node->start != AMDGPU_BO_INVALID_OFFSET)
112 if (place && place->lpfn)
117 mode = DRM_MM_INSERT_BEST;
118 if (place && place->flags & TTM_PL_FLAG_TOPDOWN)
119 mode = DRM_MM_INSERT_HIGH;
121 spin_lock(&mgr->lock);
122 r = drm_mm_insert_node_in_range(&mgr->mm, node,
123 mem->num_pages, mem->page_alignment, 0,
125 spin_unlock(&mgr->lock);
128 mem->start = node->start;
129 if (&tbo->mem == mem)
130 tbo->offset = (tbo->mem.start << PAGE_SHIFT) +
131 tbo->bdev->man[tbo->mem.mem_type].gpu_offset;
138 * amdgpu_gtt_mgr_new - allocate a new node
140 * @man: TTM memory type manager
141 * @tbo: TTM BO we need this range for
142 * @place: placement flags and restrictions
143 * @mem: the resulting mem object
145 * Dummy, allocate the node but no space for it yet.
147 static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man,
148 struct ttm_buffer_object *tbo,
149 const struct ttm_place *place,
150 struct ttm_mem_reg *mem)
152 struct amdgpu_gtt_mgr *mgr = man->priv;
153 struct drm_mm_node *node;
156 spin_lock(&mgr->lock);
157 if (mgr->available < mem->num_pages) {
158 spin_unlock(&mgr->lock);
161 mgr->available -= mem->num_pages;
162 spin_unlock(&mgr->lock);
164 node = kzalloc(sizeof(*node), GFP_KERNEL);
170 node->start = AMDGPU_BO_INVALID_OFFSET;
171 node->size = mem->num_pages;
174 if (place->fpfn || place->lpfn || place->flags & TTM_PL_FLAG_TOPDOWN) {
175 r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem);
183 mem->start = node->start;
188 spin_lock(&mgr->lock);
189 mgr->available += mem->num_pages;
190 spin_unlock(&mgr->lock);
196 * amdgpu_gtt_mgr_del - free ranges
198 * @man: TTM memory type manager
199 * @tbo: TTM BO we need this range for
200 * @place: placement flags and restrictions
201 * @mem: TTM memory object
203 * Free the allocated GTT again.
205 static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man,
206 struct ttm_mem_reg *mem)
208 struct amdgpu_gtt_mgr *mgr = man->priv;
209 struct drm_mm_node *node = mem->mm_node;
214 spin_lock(&mgr->lock);
215 if (node->start != AMDGPU_BO_INVALID_OFFSET)
216 drm_mm_remove_node(node);
217 mgr->available += mem->num_pages;
218 spin_unlock(&mgr->lock);
225 * amdgpu_gtt_mgr_debug - dump VRAM table
227 * @man: TTM memory type manager
228 * @prefix: text prefix
230 * Dump the table content using printk.
232 static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man,
235 struct amdgpu_gtt_mgr *mgr = man->priv;
236 struct drm_printer p = drm_debug_printer(prefix);
238 spin_lock(&mgr->lock);
239 drm_mm_print(&mgr->mm, &p);
240 spin_unlock(&mgr->lock);
243 const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = {
244 .init = amdgpu_gtt_mgr_init,
245 .takedown = amdgpu_gtt_mgr_fini,
246 .get_node = amdgpu_gtt_mgr_new,
247 .put_node = amdgpu_gtt_mgr_del,
248 .debug = amdgpu_gtt_mgr_debug