1/*
2 * Copyright 2016 Advanced Micro Devices, Inc.
3 *
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:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
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.
21 *
22 * Authors: Christian König
23 */
24
25#include <drm/ttm/ttm_range_manager.h>
26
27#include "amdgpu.h"
28
29static inline struct amdgpu_gtt_mgr *
30to_gtt_mgr(struct ttm_resource_manager *man)
31{
32 return container_of(man, struct amdgpu_gtt_mgr, manager);
33}
34
35/**
36 * DOC: mem_info_gtt_total
37 *
38 * The amdgpu driver provides a sysfs API for reporting current total size of
39 * the GTT.
40 * The file mem_info_gtt_total is used for this, and returns the total size of
41 * the GTT block, in bytes
42 */
43static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev,
44 struct device_attribute *attr,
45 char *buf)
46{
47 struct drm_device *ddev = dev_get_drvdata(dev);
48 struct amdgpu_device *adev = drm_to_adev(ddev);
49 struct ttm_resource_manager *man;
50
51 man = ttm_manager_type(bdev: &adev->mman.bdev, TTM_PL_TT);
52 return sysfs_emit(buf, fmt: "%llu\n", man->size);
53}
54
55/**
56 * DOC: mem_info_gtt_used
57 *
58 * The amdgpu driver provides a sysfs API for reporting current total amount of
59 * used GTT.
60 * The file mem_info_gtt_used is used for this, and returns the current used
61 * size of the GTT block, in bytes
62 */
63static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev,
64 struct device_attribute *attr,
65 char *buf)
66{
67 struct drm_device *ddev = dev_get_drvdata(dev);
68 struct amdgpu_device *adev = drm_to_adev(ddev);
69 struct ttm_resource_manager *man = &adev->mman.gtt_mgr.manager;
70
71 return sysfs_emit(buf, fmt: "%llu\n", ttm_resource_manager_usage(man));
72}
73
74static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
75 amdgpu_mem_info_gtt_total_show, NULL);
76static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
77 amdgpu_mem_info_gtt_used_show, NULL);
78
79static struct attribute *amdgpu_gtt_mgr_attributes[] = {
80 &dev_attr_mem_info_gtt_total.attr,
81 &dev_attr_mem_info_gtt_used.attr,
82 NULL
83};
84
85const struct attribute_group amdgpu_gtt_mgr_attr_group = {
86 .attrs = amdgpu_gtt_mgr_attributes
87};
88
89/**
90 * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
91 *
92 * @res: the mem object to check
93 *
94 * Check if a mem object has already address space allocated.
95 */
96bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *res)
97{
98 struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res);
99
100 return drm_mm_node_allocated(node: &node->mm_nodes[0]);
101}
102
103/**
104 * amdgpu_gtt_mgr_new - allocate a new node
105 *
106 * @man: TTM memory type manager
107 * @tbo: TTM BO we need this range for
108 * @place: placement flags and restrictions
109 * @res: the resulting mem object
110 *
111 * Dummy, allocate the node but no space for it yet.
112 */
113static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
114 struct ttm_buffer_object *tbo,
115 const struct ttm_place *place,
116 struct ttm_resource **res)
117{
118 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
119 uint32_t num_pages = PFN_UP(tbo->base.size);
120 struct ttm_range_mgr_node *node;
121 int r;
122
123 node = kzalloc(struct_size(node, mm_nodes, 1), GFP_KERNEL);
124 if (!node)
125 return -ENOMEM;
126
127 ttm_resource_init(bo: tbo, place, res: &node->base);
128 if (!(place->flags & TTM_PL_FLAG_TEMPORARY) &&
129 ttm_resource_manager_usage(man) > man->size) {
130 r = -ENOSPC;
131 goto err_free;
132 }
133
134 if (place->lpfn) {
135 spin_lock(lock: &mgr->lock);
136 r = drm_mm_insert_node_in_range(mm: &mgr->mm, node: &node->mm_nodes[0],
137 size: num_pages, alignment: tbo->page_alignment,
138 color: 0, start: place->fpfn, end: place->lpfn,
139 mode: DRM_MM_INSERT_BEST);
140 spin_unlock(lock: &mgr->lock);
141 if (unlikely(r))
142 goto err_free;
143
144 node->base.start = node->mm_nodes[0].start;
145 } else {
146 node->mm_nodes[0].start = 0;
147 node->mm_nodes[0].size = PFN_UP(node->base.size);
148 node->base.start = AMDGPU_BO_INVALID_OFFSET;
149 }
150
151 *res = &node->base;
152 return 0;
153
154err_free:
155 ttm_resource_fini(man, res: &node->base);
156 kfree(objp: node);
157 return r;
158}
159
160/**
161 * amdgpu_gtt_mgr_del - free ranges
162 *
163 * @man: TTM memory type manager
164 * @res: TTM memory object
165 *
166 * Free the allocated GTT again.
167 */
168static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
169 struct ttm_resource *res)
170{
171 struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res);
172 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
173
174 spin_lock(lock: &mgr->lock);
175 if (drm_mm_node_allocated(node: &node->mm_nodes[0]))
176 drm_mm_remove_node(node: &node->mm_nodes[0]);
177 spin_unlock(lock: &mgr->lock);
178
179 ttm_resource_fini(man, res);
180 kfree(objp: node);
181}
182
183/**
184 * amdgpu_gtt_mgr_recover - re-init gart
185 *
186 * @mgr: amdgpu_gtt_mgr pointer
187 *
188 * Re-init the gart for each known BO in the GTT.
189 */
190void amdgpu_gtt_mgr_recover(struct amdgpu_gtt_mgr *mgr)
191{
192 struct ttm_range_mgr_node *node;
193 struct drm_mm_node *mm_node;
194 struct amdgpu_device *adev;
195
196 adev = container_of(mgr, typeof(*adev), mman.gtt_mgr);
197 spin_lock(lock: &mgr->lock);
198 drm_mm_for_each_node(mm_node, &mgr->mm) {
199 node = container_of(mm_node, typeof(*node), mm_nodes[0]);
200 amdgpu_ttm_recover_gart(tbo: node->base.bo);
201 }
202 spin_unlock(lock: &mgr->lock);
203}
204
205/**
206 * amdgpu_gtt_mgr_intersects - test for intersection
207 *
208 * @man: Our manager object
209 * @res: The resource to test
210 * @place: The place for the new allocation
211 * @size: The size of the new allocation
212 *
213 * Simplified intersection test, only interesting if we need GART or not.
214 */
215static bool amdgpu_gtt_mgr_intersects(struct ttm_resource_manager *man,
216 struct ttm_resource *res,
217 const struct ttm_place *place,
218 size_t size)
219{
220 return !place->lpfn || amdgpu_gtt_mgr_has_gart_addr(res);
221}
222
223/**
224 * amdgpu_gtt_mgr_compatible - test for compatibility
225 *
226 * @man: Our manager object
227 * @res: The resource to test
228 * @place: The place for the new allocation
229 * @size: The size of the new allocation
230 *
231 * Simplified compatibility test.
232 */
233static bool amdgpu_gtt_mgr_compatible(struct ttm_resource_manager *man,
234 struct ttm_resource *res,
235 const struct ttm_place *place,
236 size_t size)
237{
238 return !place->lpfn || amdgpu_gtt_mgr_has_gart_addr(res);
239}
240
241/**
242 * amdgpu_gtt_mgr_debug - dump VRAM table
243 *
244 * @man: TTM memory type manager
245 * @printer: DRM printer to use
246 *
247 * Dump the table content using printk.
248 */
249static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man,
250 struct drm_printer *printer)
251{
252 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
253
254 spin_lock(lock: &mgr->lock);
255 drm_mm_print(mm: &mgr->mm, p: printer);
256 spin_unlock(lock: &mgr->lock);
257}
258
259static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = {
260 .alloc = amdgpu_gtt_mgr_new,
261 .free = amdgpu_gtt_mgr_del,
262 .intersects = amdgpu_gtt_mgr_intersects,
263 .compatible = amdgpu_gtt_mgr_compatible,
264 .debug = amdgpu_gtt_mgr_debug
265};
266
267/**
268 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
269 *
270 * @adev: amdgpu_device pointer
271 * @gtt_size: maximum size of GTT
272 *
273 * Allocate and initialize the GTT manager.
274 */
275int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size)
276{
277 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
278 struct ttm_resource_manager *man = &mgr->manager;
279 uint64_t start, size;
280
281 man->use_tt = true;
282 man->func = &amdgpu_gtt_mgr_func;
283
284 ttm_resource_manager_init(man, bdev: &adev->mman.bdev, size: gtt_size);
285
286 start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
287 start += amdgpu_vce_required_gart_pages(adev);
288 size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
289 drm_mm_init(mm: &mgr->mm, start, size);
290 spin_lock_init(&mgr->lock);
291
292 ttm_set_driver_manager(bdev: &adev->mman.bdev, TTM_PL_TT, manager: &mgr->manager);
293 ttm_resource_manager_set_used(man, used: true);
294 return 0;
295}
296
297/**
298 * amdgpu_gtt_mgr_fini - free and destroy GTT manager
299 *
300 * @adev: amdgpu_device pointer
301 *
302 * Destroy and free the GTT manager, returns -EBUSY if ranges are still
303 * allocated inside it.
304 */
305void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev)
306{
307 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
308 struct ttm_resource_manager *man = &mgr->manager;
309 int ret;
310
311 ttm_resource_manager_set_used(man, used: false);
312
313 ret = ttm_resource_manager_evict_all(bdev: &adev->mman.bdev, man);
314 if (ret)
315 return;
316
317 spin_lock(lock: &mgr->lock);
318 drm_mm_takedown(mm: &mgr->mm);
319 spin_unlock(lock: &mgr->lock);
320
321 ttm_resource_manager_cleanup(man);
322 ttm_set_driver_manager(bdev: &adev->mman.bdev, TTM_PL_TT, NULL);
323}
324

source code of linux/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c