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 struct amdgpu_gtt_node {
30 	struct ttm_buffer_object *tbo;
31 	struct ttm_range_mgr_node base;
32 };
33 
34 static inline struct amdgpu_gtt_mgr *
35 to_gtt_mgr(struct ttm_resource_manager *man)
36 {
37 	return container_of(man, struct amdgpu_gtt_mgr, manager);
38 }
39 
40 static inline struct amdgpu_gtt_node *
41 to_amdgpu_gtt_node(struct ttm_resource *res)
42 {
43 	return container_of(res, struct amdgpu_gtt_node, base.base);
44 }
45 
46 /**
47  * DOC: mem_info_gtt_total
48  *
49  * The amdgpu driver provides a sysfs API for reporting current total size of
50  * the GTT.
51  * The file mem_info_gtt_total is used for this, and returns the total size of
52  * the GTT block, in bytes
53  */
54 static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev,
55 					      struct device_attribute *attr,
56 					      char *buf)
57 {
58 	struct drm_device *ddev = dev_get_drvdata(dev);
59 	struct amdgpu_device *adev = drm_to_adev(ddev);
60 	struct ttm_resource_manager *man;
61 
62 	man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
63 	return sysfs_emit(buf, "%llu\n", man->size * PAGE_SIZE);
64 }
65 
66 /**
67  * DOC: mem_info_gtt_used
68  *
69  * The amdgpu driver provides a sysfs API for reporting current total amount of
70  * used GTT.
71  * The file mem_info_gtt_used is used for this, and returns the current used
72  * size of the GTT block, in bytes
73  */
74 static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev,
75 					     struct device_attribute *attr,
76 					     char *buf)
77 {
78 	struct drm_device *ddev = dev_get_drvdata(dev);
79 	struct amdgpu_device *adev = drm_to_adev(ddev);
80 	struct ttm_resource_manager *man;
81 
82 	man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT);
83 	return sysfs_emit(buf, "%llu\n", amdgpu_gtt_mgr_usage(man));
84 }
85 
86 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
87 	           amdgpu_mem_info_gtt_total_show, NULL);
88 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
89 	           amdgpu_mem_info_gtt_used_show, NULL);
90 
91 static struct attribute *amdgpu_gtt_mgr_attributes[] = {
92 	&dev_attr_mem_info_gtt_total.attr,
93 	&dev_attr_mem_info_gtt_used.attr,
94 	NULL
95 };
96 
97 const struct attribute_group amdgpu_gtt_mgr_attr_group = {
98 	.attrs = amdgpu_gtt_mgr_attributes
99 };
100 
101 /**
102  * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
103  *
104  * @res: the mem object to check
105  *
106  * Check if a mem object has already address space allocated.
107  */
108 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *res)
109 {
110 	struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(res);
111 
112 	return drm_mm_node_allocated(&node->base.mm_nodes[0]);
113 }
114 
115 /**
116  * amdgpu_gtt_mgr_new - allocate a new node
117  *
118  * @man: TTM memory type manager
119  * @tbo: TTM BO we need this range for
120  * @place: placement flags and restrictions
121  * @res: the resulting mem object
122  *
123  * Dummy, allocate the node but no space for it yet.
124  */
125 static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
126 			      struct ttm_buffer_object *tbo,
127 			      const struct ttm_place *place,
128 			      struct ttm_resource **res)
129 {
130 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
131 	uint32_t num_pages = PFN_UP(tbo->base.size);
132 	struct amdgpu_gtt_node *node;
133 	int r;
134 
135 	if (!(place->flags & TTM_PL_FLAG_TEMPORARY) &&
136 	    atomic64_add_return(num_pages, &mgr->used) >  man->size) {
137 		atomic64_sub(num_pages, &mgr->used);
138 		return -ENOSPC;
139 	}
140 
141 	node = kzalloc(struct_size(node, base.mm_nodes, 1), GFP_KERNEL);
142 	if (!node) {
143 		r = -ENOMEM;
144 		goto err_out;
145 	}
146 
147 	node->tbo = tbo;
148 	ttm_resource_init(tbo, place, &node->base.base);
149 
150 	if (place->lpfn) {
151 		spin_lock(&mgr->lock);
152 		r = drm_mm_insert_node_in_range(&mgr->mm,
153 						&node->base.mm_nodes[0],
154 						num_pages, tbo->page_alignment,
155 						0, place->fpfn, place->lpfn,
156 						DRM_MM_INSERT_BEST);
157 		spin_unlock(&mgr->lock);
158 		if (unlikely(r))
159 			goto err_free;
160 
161 		node->base.base.start = node->base.mm_nodes[0].start;
162 	} else {
163 		node->base.mm_nodes[0].start = 0;
164 		node->base.mm_nodes[0].size = node->base.base.num_pages;
165 		node->base.base.start = AMDGPU_BO_INVALID_OFFSET;
166 	}
167 
168 	*res = &node->base.base;
169 	return 0;
170 
171 err_free:
172 	kfree(node);
173 
174 err_out:
175 	if (!(place->flags & TTM_PL_FLAG_TEMPORARY))
176 		atomic64_sub(num_pages, &mgr->used);
177 
178 	return r;
179 }
180 
181 /**
182  * amdgpu_gtt_mgr_del - free ranges
183  *
184  * @man: TTM memory type manager
185  * @res: TTM memory object
186  *
187  * Free the allocated GTT again.
188  */
189 static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
190 			       struct ttm_resource *res)
191 {
192 	struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(res);
193 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
194 
195 	spin_lock(&mgr->lock);
196 	if (drm_mm_node_allocated(&node->base.mm_nodes[0]))
197 		drm_mm_remove_node(&node->base.mm_nodes[0]);
198 	spin_unlock(&mgr->lock);
199 
200 	if (!(res->placement & TTM_PL_FLAG_TEMPORARY))
201 		atomic64_sub(res->num_pages, &mgr->used);
202 
203 	kfree(node);
204 }
205 
206 /**
207  * amdgpu_gtt_mgr_usage - return usage of GTT domain
208  *
209  * @man: TTM memory type manager
210  *
211  * Return how many bytes are used in the GTT domain
212  */
213 uint64_t amdgpu_gtt_mgr_usage(struct ttm_resource_manager *man)
214 {
215 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
216 
217 	return atomic64_read(&mgr->used) * PAGE_SIZE;
218 }
219 
220 /**
221  * amdgpu_gtt_mgr_recover - re-init gart
222  *
223  * @man: TTM memory type manager
224  *
225  * Re-init the gart for each known BO in the GTT.
226  */
227 int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man)
228 {
229 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
230 	struct amdgpu_device *adev;
231 	struct amdgpu_gtt_node *node;
232 	struct drm_mm_node *mm_node;
233 	int r = 0;
234 
235 	adev = container_of(mgr, typeof(*adev), mman.gtt_mgr);
236 	spin_lock(&mgr->lock);
237 	drm_mm_for_each_node(mm_node, &mgr->mm) {
238 		node = container_of(mm_node, typeof(*node), base.mm_nodes[0]);
239 		r = amdgpu_ttm_recover_gart(node->tbo);
240 		if (r)
241 			break;
242 	}
243 	spin_unlock(&mgr->lock);
244 
245 	amdgpu_gart_invalidate_tlb(adev);
246 
247 	return r;
248 }
249 
250 /**
251  * amdgpu_gtt_mgr_debug - dump VRAM table
252  *
253  * @man: TTM memory type manager
254  * @printer: DRM printer to use
255  *
256  * Dump the table content using printk.
257  */
258 static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man,
259 				 struct drm_printer *printer)
260 {
261 	struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
262 
263 	spin_lock(&mgr->lock);
264 	drm_mm_print(&mgr->mm, printer);
265 	spin_unlock(&mgr->lock);
266 
267 	drm_printf(printer, "man size:%llu pages,  gtt used:%llu pages\n",
268 		   man->size, atomic64_read(&mgr->used));
269 }
270 
271 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = {
272 	.alloc = amdgpu_gtt_mgr_new,
273 	.free = amdgpu_gtt_mgr_del,
274 	.debug = amdgpu_gtt_mgr_debug
275 };
276 
277 /**
278  * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
279  *
280  * @adev: amdgpu_device pointer
281  * @gtt_size: maximum size of GTT
282  *
283  * Allocate and initialize the GTT manager.
284  */
285 int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size)
286 {
287 	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
288 	struct ttm_resource_manager *man = &mgr->manager;
289 	uint64_t start, size;
290 
291 	man->use_tt = true;
292 	man->func = &amdgpu_gtt_mgr_func;
293 
294 	ttm_resource_manager_init(man, gtt_size >> PAGE_SHIFT);
295 
296 	start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
297 	size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
298 	drm_mm_init(&mgr->mm, start, size);
299 	spin_lock_init(&mgr->lock);
300 	atomic64_set(&mgr->used, 0);
301 
302 	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager);
303 	ttm_resource_manager_set_used(man, true);
304 	return 0;
305 }
306 
307 /**
308  * amdgpu_gtt_mgr_fini - free and destroy GTT manager
309  *
310  * @adev: amdgpu_device pointer
311  *
312  * Destroy and free the GTT manager, returns -EBUSY if ranges are still
313  * allocated inside it.
314  */
315 void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev)
316 {
317 	struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr;
318 	struct ttm_resource_manager *man = &mgr->manager;
319 	int ret;
320 
321 	ttm_resource_manager_set_used(man, false);
322 
323 	ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
324 	if (ret)
325 		return;
326 
327 	spin_lock(&mgr->lock);
328 	drm_mm_takedown(&mgr->mm);
329 	spin_unlock(&mgr->lock);
330 
331 	ttm_resource_manager_cleanup(man);
332 	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL);
333 }
334