tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
27static 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
32struct 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 */
45static 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 */
63static 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
73static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
74 amdgpu_mem_info_gtt_total_show, NULL);
75static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
76 amdgpu_mem_info_gtt_used_show, NULL);
77
78static 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 */
87int 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 */
129void 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 */
159bool 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 */
174static 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
220err_free:
221 kfree(node);
222
223err_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 */
237static 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 */
260uint64_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
268int 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 */
295static 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
309static 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};