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 static inline struct amdgpu_gtt_mgr *
to_gtt_mgr(struct ttm_resource_manager * man)30 to_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 */
amdgpu_mem_info_gtt_total_show(struct device * dev,struct device_attribute * attr,char * buf)43 static 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(&adev->mman.bdev, TTM_PL_TT);
52 return sysfs_emit(buf, "%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 */
amdgpu_mem_info_gtt_used_show(struct device * dev,struct device_attribute * attr,char * buf)63 static 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, "%llu\n", ttm_resource_manager_usage(man));
72 }
73
74 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
75 amdgpu_mem_info_gtt_total_show, NULL);
76 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
77 amdgpu_mem_info_gtt_used_show, NULL);
78
79 static 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
85 const 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 */
amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource * res)96 bool 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->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 */
amdgpu_gtt_mgr_new(struct ttm_resource_manager * man,struct ttm_buffer_object * tbo,const struct ttm_place * place,struct ttm_resource ** res)113 static 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(tbo, place, &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(&mgr->lock);
136 r = drm_mm_insert_node_in_range(&mgr->mm, &node->mm_nodes[0],
137 num_pages, tbo->page_alignment,
138 0, place->fpfn, place->lpfn,
139 DRM_MM_INSERT_BEST);
140 spin_unlock(&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 = node->base.num_pages;
148 node->base.start = AMDGPU_BO_INVALID_OFFSET;
149 }
150
151 *res = &node->base;
152 return 0;
153
154 err_free:
155 ttm_resource_fini(man, &node->base);
156 kfree(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 */
amdgpu_gtt_mgr_del(struct ttm_resource_manager * man,struct ttm_resource * res)168 static 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(&mgr->lock);
175 if (drm_mm_node_allocated(&node->mm_nodes[0]))
176 drm_mm_remove_node(&node->mm_nodes[0]);
177 spin_unlock(&mgr->lock);
178
179 ttm_resource_fini(man, res);
180 kfree(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 */
amdgpu_gtt_mgr_recover(struct amdgpu_gtt_mgr * mgr)190 void 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(&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(node->base.bo);
201 }
202 spin_unlock(&mgr->lock);
203
204 amdgpu_gart_invalidate_tlb(adev);
205 }
206
207 /**
208 * amdgpu_gtt_mgr_intersects - test for intersection
209 *
210 * @man: Our manager object
211 * @res: The resource to test
212 * @place: The place for the new allocation
213 * @size: The size of the new allocation
214 *
215 * Simplified intersection test, only interesting if we need GART or not.
216 */
amdgpu_gtt_mgr_intersects(struct ttm_resource_manager * man,struct ttm_resource * res,const struct ttm_place * place,size_t size)217 static bool amdgpu_gtt_mgr_intersects(struct ttm_resource_manager *man,
218 struct ttm_resource *res,
219 const struct ttm_place *place,
220 size_t size)
221 {
222 return !place->lpfn || amdgpu_gtt_mgr_has_gart_addr(res);
223 }
224
225 /**
226 * amdgpu_gtt_mgr_compatible - test for compatibility
227 *
228 * @man: Our manager object
229 * @res: The resource to test
230 * @place: The place for the new allocation
231 * @size: The size of the new allocation
232 *
233 * Simplified compatibility test.
234 */
amdgpu_gtt_mgr_compatible(struct ttm_resource_manager * man,struct ttm_resource * res,const struct ttm_place * place,size_t size)235 static bool amdgpu_gtt_mgr_compatible(struct ttm_resource_manager *man,
236 struct ttm_resource *res,
237 const struct ttm_place *place,
238 size_t size)
239 {
240 return !place->lpfn || amdgpu_gtt_mgr_has_gart_addr(res);
241 }
242
243 /**
244 * amdgpu_gtt_mgr_debug - dump VRAM table
245 *
246 * @man: TTM memory type manager
247 * @printer: DRM printer to use
248 *
249 * Dump the table content using printk.
250 */
amdgpu_gtt_mgr_debug(struct ttm_resource_manager * man,struct drm_printer * printer)251 static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man,
252 struct drm_printer *printer)
253 {
254 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
255
256 spin_lock(&mgr->lock);
257 drm_mm_print(&mgr->mm, printer);
258 spin_unlock(&mgr->lock);
259 }
260
261 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = {
262 .alloc = amdgpu_gtt_mgr_new,
263 .free = amdgpu_gtt_mgr_del,
264 .intersects = amdgpu_gtt_mgr_intersects,
265 .compatible = amdgpu_gtt_mgr_compatible,
266 .debug = amdgpu_gtt_mgr_debug
267 };
268
269 /**
270 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
271 *
272 * @adev: amdgpu_device pointer
273 * @gtt_size: maximum size of GTT
274 *
275 * Allocate and initialize the GTT manager.
276 */
amdgpu_gtt_mgr_init(struct amdgpu_device * adev,uint64_t gtt_size)277 int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size)
278 {
279 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
280 struct ttm_resource_manager *man = &mgr->manager;
281 uint64_t start, size;
282
283 man->use_tt = true;
284 man->func = &amdgpu_gtt_mgr_func;
285
286 ttm_resource_manager_init(man, &adev->mman.bdev, gtt_size);
287
288 start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
289 size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
290 drm_mm_init(&mgr->mm, start, size);
291 spin_lock_init(&mgr->lock);
292
293 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager);
294 ttm_resource_manager_set_used(man, true);
295 return 0;
296 }
297
298 /**
299 * amdgpu_gtt_mgr_fini - free and destroy GTT manager
300 *
301 * @adev: amdgpu_device pointer
302 *
303 * Destroy and free the GTT manager, returns -EBUSY if ranges are still
304 * allocated inside it.
305 */
amdgpu_gtt_mgr_fini(struct amdgpu_device * adev)306 void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev)
307 {
308 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
309 struct ttm_resource_manager *man = &mgr->manager;
310 int ret;
311
312 ttm_resource_manager_set_used(man, false);
313
314 ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
315 if (ret)
316 return;
317
318 spin_lock(&mgr->lock);
319 drm_mm_takedown(&mgr->mm);
320 spin_unlock(&mgr->lock);
321
322 ttm_resource_manager_cleanup(man);
323 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL);
324 }
325
