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
29 struct amdgpu_gtt_node {
30 struct ttm_buffer_object *tbo;
31 struct ttm_range_mgr_node base;
32 };
33
34 static inline struct amdgpu_gtt_mgr *
to_gtt_mgr(struct ttm_resource_manager * man)35 to_gtt_mgr(struct ttm_resource_manager *man)
36 {
37 return container_of(man, struct amdgpu_gtt_mgr, manager);
38 }
39
40 static inline struct amdgpu_gtt_node *
to_amdgpu_gtt_node(struct ttm_resource * res)41 to_amdgpu_gtt_node(struct ttm_resource *res)
42 {
43 return container_of(res, struct amdgpu_gtt_node, base.base);
44 }
45
46 /**
47 * DOC: mem_info_gtt_total
48 *
49 * The amdgpu driver provides a sysfs API for reporting current total size of
50 * the GTT.
51 * The file mem_info_gtt_total is used for this, and returns the total size of
52 * the GTT block, in bytes
53 */
amdgpu_mem_info_gtt_total_show(struct device * dev,struct device_attribute * attr,char * buf)54 static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev,
55 struct device_attribute *attr,
56 char *buf)
57 {
58 struct drm_device *ddev = dev_get_drvdata(dev);
59 struct amdgpu_device *adev = drm_to_adev(ddev);
60 struct ttm_resource_manager *man;
61
62 man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
63 return sysfs_emit(buf, "%llu\n", man->size * PAGE_SIZE);
64 }
65
66 /**
67 * DOC: mem_info_gtt_used
68 *
69 * The amdgpu driver provides a sysfs API for reporting current total amount of
70 * used GTT.
71 * The file mem_info_gtt_used is used for this, and returns the current used
72 * size of the GTT block, in bytes
73 */
amdgpu_mem_info_gtt_used_show(struct device * dev,struct device_attribute * attr,char * buf)74 static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev,
75 struct device_attribute *attr,
76 char *buf)
77 {
78 struct drm_device *ddev = dev_get_drvdata(dev);
79 struct amdgpu_device *adev = drm_to_adev(ddev);
80 struct ttm_resource_manager *man;
81
82 man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
83 return sysfs_emit(buf, "%llu\n", amdgpu_gtt_mgr_usage(man));
84 }
85
86 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
87 amdgpu_mem_info_gtt_total_show, NULL);
88 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
89 amdgpu_mem_info_gtt_used_show, NULL);
90
91 static struct attribute *amdgpu_gtt_mgr_attributes[] = {
92 &dev_attr_mem_info_gtt_total.attr,
93 &dev_attr_mem_info_gtt_used.attr,
94 NULL
95 };
96
97 const struct attribute_group amdgpu_gtt_mgr_attr_group = {
98 .attrs = amdgpu_gtt_mgr_attributes
99 };
100
101 /**
102 * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
103 *
104 * @res: the mem object to check
105 *
106 * Check if a mem object has already address space allocated.
107 */
amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource * res)108 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *res)
109 {
110 struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(res);
111
112 return drm_mm_node_allocated(&node->base.mm_nodes[0]);
113 }
114
115 /**
116 * amdgpu_gtt_mgr_new - allocate a new node
117 *
118 * @man: TTM memory type manager
119 * @tbo: TTM BO we need this range for
120 * @place: placement flags and restrictions
121 * @res: the resulting mem object
122 *
123 * Dummy, allocate the node but no space for it yet.
124 */
amdgpu_gtt_mgr_new(struct ttm_resource_manager * man,struct ttm_buffer_object * tbo,const struct ttm_place * place,struct ttm_resource ** res)125 static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
126 struct ttm_buffer_object *tbo,
127 const struct ttm_place *place,
128 struct ttm_resource **res)
129 {
130 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
131 uint32_t num_pages = PFN_UP(tbo->base.size);
132 struct amdgpu_gtt_node *node;
133 int r;
134
135 if (!(place->flags & TTM_PL_FLAG_TEMPORARY) &&
136 atomic64_add_return(num_pages, &mgr->used) > man->size) {
137 atomic64_sub(num_pages, &mgr->used);
138 return -ENOSPC;
139 }
140
141 node = kzalloc(struct_size(node, base.mm_nodes, 1), GFP_KERNEL);
142 if (!node) {
143 r = -ENOMEM;
144 goto err_out;
145 }
146
147 node->tbo = tbo;
148 ttm_resource_init(tbo, place, &node->base.base);
149
150 if (place->lpfn) {
151 spin_lock(&mgr->lock);
152 r = drm_mm_insert_node_in_range(&mgr->mm,
153 &node->base.mm_nodes[0],
154 num_pages, tbo->page_alignment,
155 0, place->fpfn, place->lpfn,
156 DRM_MM_INSERT_BEST);
157 spin_unlock(&mgr->lock);
158 if (unlikely(r))
159 goto err_free;
160
161 node->base.base.start = node->base.mm_nodes[0].start;
162 } else {
163 node->base.mm_nodes[0].start = 0;
164 node->base.mm_nodes[0].size = node->base.base.num_pages;
165 node->base.base.start = AMDGPU_BO_INVALID_OFFSET;
166 }
167
168 *res = &node->base.base;
169 return 0;
170
171 err_free:
172 kfree(node);
173
174 err_out:
175 if (!(place->flags & TTM_PL_FLAG_TEMPORARY))
176 atomic64_sub(num_pages, &mgr->used);
177
178 return r;
179 }
180
181 /**
182 * amdgpu_gtt_mgr_del - free ranges
183 *
184 * @man: TTM memory type manager
185 * @res: TTM memory object
186 *
187 * Free the allocated GTT again.
188 */
amdgpu_gtt_mgr_del(struct ttm_resource_manager * man,struct ttm_resource * res)189 static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
190 struct ttm_resource *res)
191 {
192 struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(res);
193 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
194
195 spin_lock(&mgr->lock);
196 if (drm_mm_node_allocated(&node->base.mm_nodes[0]))
197 drm_mm_remove_node(&node->base.mm_nodes[0]);
198 spin_unlock(&mgr->lock);
199
200 if (!(res->placement & TTM_PL_FLAG_TEMPORARY))
201 atomic64_sub(res->num_pages, &mgr->used);
202
203 kfree(node);
204 }
205
206 /**
207 * amdgpu_gtt_mgr_usage - return usage of GTT domain
208 *
209 * @man: TTM memory type manager
210 *
211 * Return how many bytes are used in the GTT domain
212 */
amdgpu_gtt_mgr_usage(struct ttm_resource_manager * man)213 uint64_t amdgpu_gtt_mgr_usage(struct ttm_resource_manager *man)
214 {
215 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
216
217 return atomic64_read(&mgr->used) * PAGE_SIZE;
218 }
219
220 /**
221 * amdgpu_gtt_mgr_recover - re-init gart
222 *
223 * @man: TTM memory type manager
224 *
225 * Re-init the gart for each known BO in the GTT.
226 */
amdgpu_gtt_mgr_recover(struct ttm_resource_manager * man)227 int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man)
228 {
229 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
230 struct amdgpu_device *adev;
231 struct amdgpu_gtt_node *node;
232 struct drm_mm_node *mm_node;
233 int r = 0;
234
235 adev = container_of(mgr, typeof(*adev), mman.gtt_mgr);
236 spin_lock(&mgr->lock);
237 drm_mm_for_each_node(mm_node, &mgr->mm) {
238 node = container_of(mm_node, typeof(*node), base.mm_nodes[0]);
239 r = amdgpu_ttm_recover_gart(node->tbo);
240 if (r)
241 break;
242 }
243 spin_unlock(&mgr->lock);
244
245 amdgpu_gart_invalidate_tlb(adev);
246
247 return r;
248 }
249
250 /**
251 * amdgpu_gtt_mgr_debug - dump VRAM table
252 *
253 * @man: TTM memory type manager
254 * @printer: DRM printer to use
255 *
256 * Dump the table content using printk.
257 */
amdgpu_gtt_mgr_debug(struct ttm_resource_manager * man,struct drm_printer * printer)258 static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man,
259 struct drm_printer *printer)
260 {
261 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
262
263 spin_lock(&mgr->lock);
264 drm_mm_print(&mgr->mm, printer);
265 spin_unlock(&mgr->lock);
266
267 drm_printf(printer, "man size:%llu pages, gtt used:%llu pages\n",
268 man->size, atomic64_read(&mgr->used));
269 }
270
271 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = {
272 .alloc = amdgpu_gtt_mgr_new,
273 .free = amdgpu_gtt_mgr_del,
274 .debug = amdgpu_gtt_mgr_debug
275 };
276
277 /**
278 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
279 *
280 * @adev: amdgpu_device pointer
281 * @gtt_size: maximum size of GTT
282 *
283 * Allocate and initialize the GTT manager.
284 */
amdgpu_gtt_mgr_init(struct amdgpu_device * adev,uint64_t gtt_size)285 int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size)
286 {
287 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
288 struct ttm_resource_manager *man = &mgr->manager;
289 uint64_t start, size;
290
291 man->use_tt = true;
292 man->func = &amdgpu_gtt_mgr_func;
293
294 ttm_resource_manager_init(man, gtt_size >> PAGE_SHIFT);
295
296 start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
297 size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
298 drm_mm_init(&mgr->mm, start, size);
299 spin_lock_init(&mgr->lock);
300 atomic64_set(&mgr->used, 0);
301
302 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager);
303 ttm_resource_manager_set_used(man, true);
304 return 0;
305 }
306
307 /**
308 * amdgpu_gtt_mgr_fini - free and destroy GTT manager
309 *
310 * @adev: amdgpu_device pointer
311 *
312 * Destroy and free the GTT manager, returns -EBUSY if ranges are still
313 * allocated inside it.
314 */
amdgpu_gtt_mgr_fini(struct amdgpu_device * adev)315 void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev)
316 {
317 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
318 struct ttm_resource_manager *man = &mgr->manager;
319 int ret;
320
321 ttm_resource_manager_set_used(man, false);
322
323 ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
324 if (ret)
325 return;
326
327 spin_lock(&mgr->lock);
328 drm_mm_takedown(&mgr->mm);
329 spin_unlock(&mgr->lock);
330
331 ttm_resource_manager_cleanup(man);
332 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL);
333 }
334