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 #define GART_ENTRY_WITHOUT_BO_COLOR 1
30
31 static inline struct amdgpu_gtt_mgr *
to_gtt_mgr(struct ttm_resource_manager * man)32 to_gtt_mgr(struct ttm_resource_manager *man)
33 {
34 return container_of(man, struct amdgpu_gtt_mgr, manager);
35 }
36
37 /**
38 * DOC: mem_info_gtt_total
39 *
40 * The amdgpu driver provides a sysfs API for reporting current total size of
41 * the GTT.
42 * The file mem_info_gtt_total is used for this, and returns the total size of
43 * the GTT block, in bytes
44 */
amdgpu_mem_info_gtt_total_show(struct device * dev,struct device_attribute * attr,char * buf)45 static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev,
46 struct device_attribute *attr,
47 char *buf)
48 {
49 struct drm_device *ddev = dev_get_drvdata(dev);
50 struct amdgpu_device *adev = drm_to_adev(ddev);
51 struct ttm_resource_manager *man;
52
53 man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
54 return sysfs_emit(buf, "%llu\n", man->size);
55 }
56
57 /**
58 * DOC: mem_info_gtt_used
59 *
60 * The amdgpu driver provides a sysfs API for reporting current total amount of
61 * used GTT.
62 * The file mem_info_gtt_used is used for this, and returns the current used
63 * size of the GTT block, in bytes
64 */
amdgpu_mem_info_gtt_used_show(struct device * dev,struct device_attribute * attr,char * buf)65 static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev,
66 struct device_attribute *attr,
67 char *buf)
68 {
69 struct drm_device *ddev = dev_get_drvdata(dev);
70 struct amdgpu_device *adev = drm_to_adev(ddev);
71 struct ttm_resource_manager *man = &adev->mman.gtt_mgr.manager;
72
73 return sysfs_emit(buf, "%llu\n", ttm_resource_manager_usage(man));
74 }
75
76 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
77 amdgpu_mem_info_gtt_total_show, NULL);
78 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
79 amdgpu_mem_info_gtt_used_show, NULL);
80
81 static struct attribute *amdgpu_gtt_mgr_attributes[] = {
82 &dev_attr_mem_info_gtt_total.attr,
83 &dev_attr_mem_info_gtt_used.attr,
84 NULL
85 };
86
87 const struct attribute_group amdgpu_gtt_mgr_attr_group = {
88 .attrs = amdgpu_gtt_mgr_attributes
89 };
90
91 /**
92 * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
93 *
94 * @res: the mem object to check
95 *
96 * Check if a mem object has already address space allocated.
97 */
amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource * res)98 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *res)
99 {
100 struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res);
101
102 return drm_mm_node_allocated(&node->mm_nodes[0]);
103 }
104
105 /**
106 * amdgpu_gtt_mgr_new - allocate a new node
107 *
108 * @man: TTM memory type manager
109 * @tbo: TTM BO we need this range for
110 * @place: placement flags and restrictions
111 * @res: the resulting mem object
112 *
113 * Dummy, allocate the node but no space for it yet.
114 */
amdgpu_gtt_mgr_new(struct ttm_resource_manager * man,struct ttm_buffer_object * tbo,const struct ttm_place * place,struct ttm_resource ** res)115 static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
116 struct ttm_buffer_object *tbo,
117 const struct ttm_place *place,
118 struct ttm_resource **res)
119 {
120 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
121 uint32_t num_pages = PFN_UP(tbo->base.size);
122 struct ttm_range_mgr_node *node;
123 int r;
124
125 node = kzalloc_flex(*node, mm_nodes, 1);
126 if (!node)
127 return -ENOMEM;
128
129 ttm_resource_init(tbo, place, &node->base);
130 if (!(place->flags & TTM_PL_FLAG_TEMPORARY) &&
131 ttm_resource_manager_usage(man) > man->size) {
132 r = -ENOSPC;
133 goto err_free;
134 }
135
136 if (place->lpfn) {
137 spin_lock(&mgr->lock);
138 r = drm_mm_insert_node_in_range(&mgr->mm, &node->mm_nodes[0],
139 num_pages, tbo->page_alignment,
140 0, place->fpfn, place->lpfn,
141 DRM_MM_INSERT_BEST);
142 spin_unlock(&mgr->lock);
143 if (unlikely(r))
144 goto err_free;
145
146 node->base.start = node->mm_nodes[0].start;
147 } else {
148 node->mm_nodes[0].start = 0;
149 node->mm_nodes[0].size = PFN_UP(node->base.size);
150 node->base.start = AMDGPU_BO_INVALID_OFFSET;
151 }
152
153 *res = &node->base;
154 return 0;
155
156 err_free:
157 ttm_resource_fini(man, &node->base);
158 kfree(node);
159 return r;
160 }
161
162 /**
163 * amdgpu_gtt_mgr_del - free ranges
164 *
165 * @man: TTM memory type manager
166 * @res: TTM memory object
167 *
168 * Free the allocated GTT again.
169 */
amdgpu_gtt_mgr_del(struct ttm_resource_manager * man,struct ttm_resource * res)170 static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
171 struct ttm_resource *res)
172 {
173 struct ttm_range_mgr_node *node = to_ttm_range_mgr_node(res);
174 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
175
176 spin_lock(&mgr->lock);
177 if (drm_mm_node_allocated(&node->mm_nodes[0]))
178 drm_mm_remove_node(&node->mm_nodes[0]);
179 spin_unlock(&mgr->lock);
180
181 ttm_resource_fini(man, res);
182 kfree(node);
183 }
184
185 /**
186 * amdgpu_gtt_mgr_alloc_entries - alloc GART entries without GTT bo
187 *
188 * @mgr: The GTT manager object
189 * @mm_node: The drm mm node to return the new allocation node information
190 * @num_pages: The number of pages for the new allocation
191 * @mode: The new allocation mode
192 *
193 * Helper to dynamic alloc GART entries to map memory not accociated with
194 * GTT BO, for example VRAM BO physical memory, remote physical memory.
195 */
amdgpu_gtt_mgr_alloc_entries(struct amdgpu_gtt_mgr * mgr,struct drm_mm_node * mm_node,u64 num_pages,enum drm_mm_insert_mode mode)196 int amdgpu_gtt_mgr_alloc_entries(struct amdgpu_gtt_mgr *mgr,
197 struct drm_mm_node *mm_node,
198 u64 num_pages,
199 enum drm_mm_insert_mode mode)
200 {
201 struct amdgpu_device *adev = container_of(mgr, typeof(*adev), mman.gtt_mgr);
202 u32 alignment = 0;
203 int r;
204
205 /* Align to TLB L2 cache entry size to work around "V bit HW bug" */
206 if (adev->asic_type == CHIP_TAHITI) {
207 alignment = 32 * 1024 / AMDGPU_GPU_PAGE_SIZE;
208 num_pages = ALIGN(num_pages, alignment);
209 }
210
211 spin_lock(&mgr->lock);
212 r = drm_mm_insert_node_in_range(&mgr->mm, mm_node, num_pages,
213 alignment, GART_ENTRY_WITHOUT_BO_COLOR, 0,
214 adev->gmc.gart_size >> PAGE_SHIFT,
215 mode);
216 spin_unlock(&mgr->lock);
217 return r;
218 }
219
220 /**
221 * amdgpu_gtt_mgr_free_entries - free GART entries not accocaited with GTT bo
222 *
223 * @mgr: The GTT manager object
224 * @mm_node: The drm mm node to free
225 */
amdgpu_gtt_mgr_free_entries(struct amdgpu_gtt_mgr * mgr,struct drm_mm_node * mm_node)226 void amdgpu_gtt_mgr_free_entries(struct amdgpu_gtt_mgr *mgr,
227 struct drm_mm_node *mm_node)
228 {
229 spin_lock(&mgr->lock);
230 if (drm_mm_node_allocated(mm_node))
231 drm_mm_remove_node(mm_node);
232 spin_unlock(&mgr->lock);
233 }
234
235 /**
236 * amdgpu_gtt_mgr_recover - re-init gart
237 *
238 * @mgr: amdgpu_gtt_mgr pointer
239 *
240 * Re-init the gart for each known BO in the GTT.
241 */
amdgpu_gtt_mgr_recover(struct amdgpu_gtt_mgr * mgr)242 void amdgpu_gtt_mgr_recover(struct amdgpu_gtt_mgr *mgr)
243 {
244 struct ttm_range_mgr_node *node;
245 struct drm_mm_node *mm_node;
246 struct amdgpu_device *adev;
247
248 adev = container_of(mgr, typeof(*adev), mman.gtt_mgr);
249 spin_lock(&mgr->lock);
250 drm_mm_for_each_node(mm_node, &mgr->mm) {
251 if (mm_node->color == GART_ENTRY_WITHOUT_BO_COLOR)
252 continue;
253
254 node = container_of(mm_node, typeof(*node), mm_nodes[0]);
255 amdgpu_ttm_recover_gart(node->base.bo);
256 }
257 spin_unlock(&mgr->lock);
258 }
259
260 /**
261 * amdgpu_gtt_mgr_intersects - test for intersection
262 *
263 * @man: Our manager object
264 * @res: The resource to test
265 * @place: The place for the new allocation
266 * @size: The size of the new allocation
267 *
268 * Simplified intersection test, only interesting if we need GART or not.
269 */
amdgpu_gtt_mgr_intersects(struct ttm_resource_manager * man,struct ttm_resource * res,const struct ttm_place * place,size_t size)270 static bool amdgpu_gtt_mgr_intersects(struct ttm_resource_manager *man,
271 struct ttm_resource *res,
272 const struct ttm_place *place,
273 size_t size)
274 {
275 return !place->lpfn || amdgpu_gtt_mgr_has_gart_addr(res);
276 }
277
278 /**
279 * amdgpu_gtt_mgr_compatible - test for compatibility
280 *
281 * @man: Our manager object
282 * @res: The resource to test
283 * @place: The place for the new allocation
284 * @size: The size of the new allocation
285 *
286 * Simplified compatibility test.
287 */
amdgpu_gtt_mgr_compatible(struct ttm_resource_manager * man,struct ttm_resource * res,const struct ttm_place * place,size_t size)288 static bool amdgpu_gtt_mgr_compatible(struct ttm_resource_manager *man,
289 struct ttm_resource *res,
290 const struct ttm_place *place,
291 size_t size)
292 {
293 return !place->lpfn || amdgpu_gtt_mgr_has_gart_addr(res);
294 }
295
296 /**
297 * amdgpu_gtt_mgr_debug - dump VRAM table
298 *
299 * @man: TTM memory type manager
300 * @printer: DRM printer to use
301 *
302 * Dump the table content using printk.
303 */
amdgpu_gtt_mgr_debug(struct ttm_resource_manager * man,struct drm_printer * printer)304 static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man,
305 struct drm_printer *printer)
306 {
307 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
308
309 spin_lock(&mgr->lock);
310 drm_mm_print(&mgr->mm, printer);
311 spin_unlock(&mgr->lock);
312 }
313
314 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = {
315 .alloc = amdgpu_gtt_mgr_new,
316 .free = amdgpu_gtt_mgr_del,
317 .intersects = amdgpu_gtt_mgr_intersects,
318 .compatible = amdgpu_gtt_mgr_compatible,
319 .debug = amdgpu_gtt_mgr_debug
320 };
321
322 /**
323 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
324 *
325 * @adev: amdgpu_device pointer
326 * @gtt_size: maximum size of GTT
327 *
328 * Allocate and initialize the GTT manager.
329 */
amdgpu_gtt_mgr_init(struct amdgpu_device * adev,uint64_t gtt_size)330 int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size)
331 {
332 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
333 struct ttm_resource_manager *man = &mgr->manager;
334
335 man->use_tt = true;
336 man->func = &amdgpu_gtt_mgr_func;
337
338 ttm_resource_manager_init(man, &adev->mman.bdev, gtt_size);
339
340 drm_mm_init(&mgr->mm, 0, adev->gmc.gart_size >> PAGE_SHIFT);
341 spin_lock_init(&mgr->lock);
342
343 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager);
344 ttm_resource_manager_set_used(man, true);
345 return 0;
346 }
347
348 /**
349 * amdgpu_gtt_mgr_fini - free and destroy GTT manager
350 *
351 * @adev: amdgpu_device pointer
352 *
353 * Destroy and free the GTT manager, returns -EBUSY if ranges are still
354 * allocated inside it.
355 */
amdgpu_gtt_mgr_fini(struct amdgpu_device * adev)356 void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev)
357 {
358 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
359 struct ttm_resource_manager *man = &mgr->manager;
360 int ret;
361
362 ttm_resource_manager_set_used(man, false);
363
364 ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
365 if (ret)
366 return;
367
368 spin_lock(&mgr->lock);
369 drm_mm_takedown(&mgr->mm);
370 spin_unlock(&mgr->lock);
371
372 ttm_resource_manager_cleanup(man);
373 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL);
374 }
375