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 snprintf(buf, PAGE_SIZE, "%llu\n",
53 			man->size * PAGE_SIZE);
54 }
55 
56 /**
57  * DOC: mem_info_gtt_used
58  *
59  * The amdgpu driver provides a sysfs API for reporting current total amount of
60  * used GTT.
61  * The file mem_info_gtt_used is used for this, and returns the current used
62  * size of the GTT block, in bytes
63  */
64 static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev,
65 		struct device_attribute *attr, 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 = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
70 
71 	return snprintf(buf, PAGE_SIZE, "%llu\n",
72 			amdgpu_gtt_mgr_usage(man));
73 }
74 
75 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
76 	           amdgpu_mem_info_gtt_total_show, NULL);
77 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
78 	           amdgpu_mem_info_gtt_used_show, NULL);
79 
80 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func;
81 /**
82  * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
83  *
84  * @man: TTM memory type manager
85  * @p_size: maximum size of GTT
86  *
87  * Allocate and initialize the GTT manager.
88  */
89 int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size)
90 {
91 	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
92 	struct ttm_resource_manager *man = &mgr->manager;
93 	uint64_t start, size;
94 	int ret;
95 
96 	man->use_tt = true;
97 	man->func = &amdgpu_gtt_mgr_func;
98 
99 	ttm_resource_manager_init(man, gtt_size >> PAGE_SHIFT);
100 
101 	start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
102 	size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
103 	drm_mm_init(&mgr->mm, start, size);
104 	spin_lock_init(&mgr->lock);
105 	atomic64_set(&mgr->available, gtt_size >> PAGE_SHIFT);
106 
107 	ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_total);
108 	if (ret) {
109 		DRM_ERROR("Failed to create device file mem_info_gtt_total\n");
110 		return ret;
111 	}
112 	ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_used);
113 	if (ret) {
114 		DRM_ERROR("Failed to create device file mem_info_gtt_used\n");
115 		return ret;
116 	}
117 
118 	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager);
119 	ttm_resource_manager_set_used(man, true);
120 	return 0;
121 }
122 
123 /**
124  * amdgpu_gtt_mgr_fini - free and destroy GTT manager
125  *
126  * @man: TTM memory type manager
127  *
128  * Destroy and free the GTT manager, returns -EBUSY if ranges are still
129  * allocated inside it.
130  */
131 void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev)
132 {
133 	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
134 	struct ttm_resource_manager *man = &mgr->manager;
135 	int ret;
136 
137 	ttm_resource_manager_set_used(man, false);
138 
139 	ret = ttm_resource_manager_force_list_clean(&adev->mman.bdev, man);
140 	if (ret)
141 		return;
142 
143 	spin_lock(&mgr->lock);
144 	drm_mm_takedown(&mgr->mm);
145 	spin_unlock(&mgr->lock);
146 
147 	device_remove_file(adev->dev, &dev_attr_mem_info_gtt_total);
148 	device_remove_file(adev->dev, &dev_attr_mem_info_gtt_used);
149 
150 	ttm_resource_manager_cleanup(man);
151 	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL);
152 }
153 
154 /**
155  * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
156  *
157  * @mem: the mem object to check
158  *
159  * Check if a mem object has already address space allocated.
160  */
161 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *mem)
162 {
163 	return mem->mm_node != NULL;
164 }
165 
166 /**
167  * amdgpu_gtt_mgr_new - allocate a new node
168  *
169  * @man: TTM memory type manager
170  * @tbo: TTM BO we need this range for
171  * @place: placement flags and restrictions
172  * @mem: the resulting mem object
173  *
174  * Dummy, allocate the node but no space for it yet.
175  */
176 static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
177 			      struct ttm_buffer_object *tbo,
178 			      const struct ttm_place *place,
179 			      struct ttm_resource *mem)
180 {
181 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
182 	struct amdgpu_gtt_node *node;
183 	int r;
184 
185 	spin_lock(&mgr->lock);
186 	if ((&tbo->mem == mem || tbo->mem.mem_type != TTM_PL_TT) &&
187 	    atomic64_read(&mgr->available) < mem->num_pages) {
188 		spin_unlock(&mgr->lock);
189 		return -ENOSPC;
190 	}
191 	atomic64_sub(mem->num_pages, &mgr->available);
192 	spin_unlock(&mgr->lock);
193 
194 	if (!place->lpfn) {
195 		mem->mm_node = NULL;
196 		mem->start = AMDGPU_BO_INVALID_OFFSET;
197 		return 0;
198 	}
199 
200 	node = kzalloc(sizeof(*node), GFP_KERNEL);
201 	if (!node) {
202 		r = -ENOMEM;
203 		goto err_out;
204 	}
205 
206 	node->tbo = tbo;
207 
208 	spin_lock(&mgr->lock);
209 	r = drm_mm_insert_node_in_range(&mgr->mm, &node->node, mem->num_pages,
210 					mem->page_alignment, 0, place->fpfn,
211 					place->lpfn, DRM_MM_INSERT_BEST);
212 	spin_unlock(&mgr->lock);
213 
214 	if (unlikely(r))
215 		goto err_free;
216 
217 	mem->mm_node = node;
218 	mem->start = node->node.start;
219 
220 	return 0;
221 
222 err_free:
223 	kfree(node);
224 
225 err_out:
226 	atomic64_add(mem->num_pages, &mgr->available);
227 
228 	return r;
229 }
230 
231 /**
232  * amdgpu_gtt_mgr_del - free ranges
233  *
234  * @man: TTM memory type manager
235  * @mem: TTM memory object
236  *
237  * Free the allocated GTT again.
238  */
239 static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
240 			       struct ttm_resource *mem)
241 {
242 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
243 	struct amdgpu_gtt_node *node = mem->mm_node;
244 
245 	if (node) {
246 		spin_lock(&mgr->lock);
247 		drm_mm_remove_node(&node->node);
248 		spin_unlock(&mgr->lock);
249 		kfree(node);
250 	}
251 
252 	atomic64_add(mem->num_pages, &mgr->available);
253 }
254 
255 /**
256  * amdgpu_gtt_mgr_usage - return usage of GTT domain
257  *
258  * @man: TTM memory type manager
259  *
260  * Return how many bytes are used in the GTT domain
261  */
262 uint64_t amdgpu_gtt_mgr_usage(struct ttm_resource_manager *man)
263 {
264 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
265 	s64 result = man->size - atomic64_read(&mgr->available);
266 
267 	return (result > 0 ? result : 0) * PAGE_SIZE;
268 }
269 
270 int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man)
271 {
272 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
273 	struct amdgpu_gtt_node *node;
274 	struct drm_mm_node *mm_node;
275 	int r = 0;
276 
277 	spin_lock(&mgr->lock);
278 	drm_mm_for_each_node(mm_node, &mgr->mm) {
279 		node = container_of(mm_node, struct amdgpu_gtt_node, node);
280 		r = amdgpu_ttm_recover_gart(node->tbo);
281 		if (r)
282 			break;
283 	}
284 	spin_unlock(&mgr->lock);
285 
286 	return r;
287 }
288 
289 /**
290  * amdgpu_gtt_mgr_debug - dump VRAM table
291  *
292  * @man: TTM memory type manager
293  * @printer: DRM printer to use
294  *
295  * Dump the table content using printk.
296  */
297 static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man,
298 				 struct drm_printer *printer)
299 {
300 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
301 
302 	spin_lock(&mgr->lock);
303 	drm_mm_print(&mgr->mm, printer);
304 	spin_unlock(&mgr->lock);
305 
306 	drm_printf(printer, "man size:%llu pages, gtt available:%lld pages, usage:%lluMB\n",
307 		   man->size, (u64)atomic64_read(&mgr->available),
308 		   amdgpu_gtt_mgr_usage(man) >> 20);
309 }
310 
311 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = {
312 	.alloc = amdgpu_gtt_mgr_new,
313 	.free = amdgpu_gtt_mgr_del,
314 	.debug = amdgpu_gtt_mgr_debug
315 };
316