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 "amdgpu.h"
26 
27 static inline struct amdgpu_gtt_mgr *to_gtt_mgr(struct ttm_resource_manager *man)
28 {
29 	return container_of(man, struct amdgpu_gtt_mgr, manager);
30 }
31 
32 struct amdgpu_gtt_node {
33 	struct drm_mm_node node;
34 	struct ttm_buffer_object *tbo;
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  */
45 static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev,
46 		struct device_attribute *attr, char *buf)
47 {
48 	struct drm_device *ddev = dev_get_drvdata(dev);
49 	struct amdgpu_device *adev = drm_to_adev(ddev);
50 	struct ttm_resource_manager *man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
51 
52 	return sysfs_emit(buf, "%llu\n", man->size * PAGE_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, char *buf)
65 {
66 	struct drm_device *ddev = dev_get_drvdata(dev);
67 	struct amdgpu_device *adev = drm_to_adev(ddev);
68 	struct ttm_resource_manager *man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
69 
70 	return sysfs_emit(buf, "%llu\n", amdgpu_gtt_mgr_usage(man));
71 }
72 
73 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
74 	           amdgpu_mem_info_gtt_total_show, NULL);
75 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
76 	           amdgpu_mem_info_gtt_used_show, NULL);
77 
78 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func;
79 /**
80  * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
81  *
82  * @adev: amdgpu_device pointer
83  * @gtt_size: maximum size of GTT
84  *
85  * Allocate and initialize the GTT manager.
86  */
87 int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size)
88 {
89 	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
90 	struct ttm_resource_manager *man = &mgr->manager;
91 	uint64_t start, size;
92 	int ret;
93 
94 	man->use_tt = true;
95 	man->func = &amdgpu_gtt_mgr_func;
96 
97 	ttm_resource_manager_init(man, gtt_size >> PAGE_SHIFT);
98 
99 	start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
100 	size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
101 	drm_mm_init(&mgr->mm, start, size);
102 	spin_lock_init(&mgr->lock);
103 	atomic64_set(&mgr->available, gtt_size >> PAGE_SHIFT);
104 
105 	ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_total);
106 	if (ret) {
107 		DRM_ERROR("Failed to create device file mem_info_gtt_total\n");
108 		return ret;
109 	}
110 	ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_used);
111 	if (ret) {
112 		DRM_ERROR("Failed to create device file mem_info_gtt_used\n");
113 		return ret;
114 	}
115 
116 	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager);
117 	ttm_resource_manager_set_used(man, true);
118 	return 0;
119 }
120 
121 /**
122  * amdgpu_gtt_mgr_fini - free and destroy GTT manager
123  *
124  * @adev: amdgpu_device pointer
125  *
126  * Destroy and free the GTT manager, returns -EBUSY if ranges are still
127  * allocated inside it.
128  */
129 void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev)
130 {
131 	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
132 	struct ttm_resource_manager *man = &mgr->manager;
133 	int ret;
134 
135 	ttm_resource_manager_set_used(man, false);
136 
137 	ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
138 	if (ret)
139 		return;
140 
141 	spin_lock(&mgr->lock);
142 	drm_mm_takedown(&mgr->mm);
143 	spin_unlock(&mgr->lock);
144 
145 	device_remove_file(adev->dev, &dev_attr_mem_info_gtt_total);
146 	device_remove_file(adev->dev, &dev_attr_mem_info_gtt_used);
147 
148 	ttm_resource_manager_cleanup(man);
149 	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL);
150 }
151 
152 /**
153  * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
154  *
155  * @mem: the mem object to check
156  *
157  * Check if a mem object has already address space allocated.
158  */
159 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *mem)
160 {
161 	return mem->mm_node != NULL;
162 }
163 
164 /**
165  * amdgpu_gtt_mgr_new - allocate a new node
166  *
167  * @man: TTM memory type manager
168  * @tbo: TTM BO we need this range for
169  * @place: placement flags and restrictions
170  * @mem: the resulting mem object
171  *
172  * Dummy, allocate the node but no space for it yet.
173  */
174 static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
175 			      struct ttm_buffer_object *tbo,
176 			      const struct ttm_place *place,
177 			      struct ttm_resource *mem)
178 {
179 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
180 	struct amdgpu_gtt_node *node;
181 	int r;
182 
183 	spin_lock(&mgr->lock);
184 	if ((&tbo->mem == mem || tbo->mem.mem_type != TTM_PL_TT) &&
185 	    atomic64_read(&mgr->available) < mem->num_pages) {
186 		spin_unlock(&mgr->lock);
187 		return -ENOSPC;
188 	}
189 	atomic64_sub(mem->num_pages, &mgr->available);
190 	spin_unlock(&mgr->lock);
191 
192 	if (!place->lpfn) {
193 		mem->mm_node = NULL;
194 		mem->start = AMDGPU_BO_INVALID_OFFSET;
195 		return 0;
196 	}
197 
198 	node = kzalloc(sizeof(*node), GFP_KERNEL);
199 	if (!node) {
200 		r = -ENOMEM;
201 		goto err_out;
202 	}
203 
204 	node->tbo = tbo;
205 
206 	spin_lock(&mgr->lock);
207 	r = drm_mm_insert_node_in_range(&mgr->mm, &node->node, mem->num_pages,
208 					mem->page_alignment, 0, place->fpfn,
209 					place->lpfn, DRM_MM_INSERT_BEST);
210 	spin_unlock(&mgr->lock);
211 
212 	if (unlikely(r))
213 		goto err_free;
214 
215 	mem->mm_node = node;
216 	mem->start = node->node.start;
217 
218 	return 0;
219 
220 err_free:
221 	kfree(node);
222 
223 err_out:
224 	atomic64_add(mem->num_pages, &mgr->available);
225 
226 	return r;
227 }
228 
229 /**
230  * amdgpu_gtt_mgr_del - free ranges
231  *
232  * @man: TTM memory type manager
233  * @mem: TTM memory object
234  *
235  * Free the allocated GTT again.
236  */
237 static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
238 			       struct ttm_resource *mem)
239 {
240 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
241 	struct amdgpu_gtt_node *node = mem->mm_node;
242 
243 	if (node) {
244 		spin_lock(&mgr->lock);
245 		drm_mm_remove_node(&node->node);
246 		spin_unlock(&mgr->lock);
247 		kfree(node);
248 	}
249 
250 	atomic64_add(mem->num_pages, &mgr->available);
251 }
252 
253 /**
254  * amdgpu_gtt_mgr_usage - return usage of GTT domain
255  *
256  * @man: TTM memory type manager
257  *
258  * Return how many bytes are used in the GTT domain
259  */
260 uint64_t amdgpu_gtt_mgr_usage(struct ttm_resource_manager *man)
261 {
262 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
263 	s64 result = man->size - atomic64_read(&mgr->available);
264 
265 	return (result > 0 ? result : 0) * PAGE_SIZE;
266 }
267 
268 int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man)
269 {
270 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
271 	struct amdgpu_gtt_node *node;
272 	struct drm_mm_node *mm_node;
273 	int r = 0;
274 
275 	spin_lock(&mgr->lock);
276 	drm_mm_for_each_node(mm_node, &mgr->mm) {
277 		node = container_of(mm_node, struct amdgpu_gtt_node, node);
278 		r = amdgpu_ttm_recover_gart(node->tbo);
279 		if (r)
280 			break;
281 	}
282 	spin_unlock(&mgr->lock);
283 
284 	return r;
285 }
286 
287 /**
288  * amdgpu_gtt_mgr_debug - dump VRAM table
289  *
290  * @man: TTM memory type manager
291  * @printer: DRM printer to use
292  *
293  * Dump the table content using printk.
294  */
295 static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man,
296 				 struct drm_printer *printer)
297 {
298 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
299 
300 	spin_lock(&mgr->lock);
301 	drm_mm_print(&mgr->mm, printer);
302 	spin_unlock(&mgr->lock);
303 
304 	drm_printf(printer, "man size:%llu pages, gtt available:%lld pages, usage:%lluMB\n",
305 		   man->size, (u64)atomic64_read(&mgr->available),
306 		   amdgpu_gtt_mgr_usage(man) >> 20);
307 }
308 
309 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = {
310 	.alloc = amdgpu_gtt_mgr_new,
311 	.free = amdgpu_gtt_mgr_del,
312 	.debug = amdgpu_gtt_mgr_debug
313 };
314