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 *
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  */
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  */
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  */
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  */
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 = PFN_UP(node->base.size);
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  */
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  */
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  */
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  */
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  */
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  */
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  */
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