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1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2
3/*
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * Copyright 2020 Advanced Micro Devices, Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
24 *
25 * Authors: Christian König
26 */
27
28#define pr_fmt(fmt) "[TTM DEVICE] " fmt
29
30#include <linux/mm.h>
31
32#include <drm/ttm/ttm_bo.h>
33#include <drm/ttm/ttm_device.h>
34#include <drm/ttm/ttm_tt.h>
35#include <drm/ttm/ttm_placement.h>
36
37#include "ttm_module.h"
38
39/*
40 * ttm_global_mutex - protecting the global state
41 */
42static DEFINE_MUTEX(ttm_global_mutex);
43static unsigned ttm_glob_use_count;
44struct ttm_global ttm_glob;
45EXPORT_SYMBOL(ttm_glob);
46
47struct dentry *ttm_debugfs_root;
48
49static void ttm_global_release(void)
50{
51 struct ttm_global *glob = &ttm_glob;
52
53 mutex_lock(&ttm_global_mutex);
54 if (--ttm_glob_use_count > 0)
55 goto out;
56
57 ttm_pool_mgr_fini();
58 debugfs_remove(ttm_debugfs_root);
59
60 __free_page(glob->dummy_read_page);
61 memset(glob, 0, sizeof(*glob));
62out:
63 mutex_unlock(&ttm_global_mutex);
64}
65
66static int ttm_global_init(void)
67{
68 struct ttm_global *glob = &ttm_glob;
69 unsigned long num_pages, num_dma32;
70 struct sysinfo si;
71 int ret = 0;
72
73 mutex_lock(&ttm_global_mutex);
74 if (++ttm_glob_use_count > 1)
75 goto out;
76
77 si_meminfo(&si);
78
79 ttm_debugfs_root = debugfs_create_dir("ttm", NULL);
80 if (IS_ERR(ttm_debugfs_root)) {
81 ttm_debugfs_root = NULL;
82 }
83
84 /* Limit the number of pages in the pool to about 50% of the total
85 * system memory.
86 */
87 num_pages = ((u64)si.totalram * si.mem_unit) >> PAGE_SHIFT;
88 num_pages /= 2;
89
90 /* But for DMA32 we limit ourself to only use 2GiB maximum. */
91 num_dma32 = (u64)(si.totalram - si.totalhigh) * si.mem_unit
92 >> PAGE_SHIFT;
93 num_dma32 = min(num_dma32, 2UL << (30 - PAGE_SHIFT));
94
95 ttm_pool_mgr_init(num_pages);
96 ttm_tt_mgr_init(num_pages, num_dma32);
97
98 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32 |
99 __GFP_NOWARN);
100
101 /* Retry without GFP_DMA32 for platforms DMA32 is not available */
102 if (unlikely(glob->dummy_read_page == NULL)) {
103 glob->dummy_read_page = alloc_page(__GFP_ZERO);
104 if (unlikely(glob->dummy_read_page == NULL)) {
105 ret = -ENOMEM;
106 goto out;
107 }
108 pr_warn("Using GFP_DMA32 fallback for dummy_read_page\n");
109 }
110
111 INIT_LIST_HEAD(&glob->device_list);
112 atomic_set(&glob->bo_count, 0);
113
114 debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root,
115 &glob->bo_count);
116out:
117 if (ret && ttm_debugfs_root)
118 debugfs_remove(ttm_debugfs_root);
119 if (ret)
120 --ttm_glob_use_count;
121 mutex_unlock(&ttm_global_mutex);
122 return ret;
123}
124
125/*
126 * A buffer object shrink method that tries to swap out the first
127 * buffer object on the global::swap_lru list.
128 */
129int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags)
130{
131 struct ttm_global *glob = &ttm_glob;
132 struct ttm_device *bdev;
133 int ret = 0;
134
135 mutex_lock(&ttm_global_mutex);
136 list_for_each_entry(bdev, &glob->device_list, device_list) {
137 ret = ttm_device_swapout(bdev, ctx, gfp_flags);
138 if (ret > 0) {
139 list_move_tail(&bdev->device_list, &glob->device_list);
140 break;
141 }
142 }
143 mutex_unlock(&ttm_global_mutex);
144 return ret;
145}
146
147int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
148 gfp_t gfp_flags)
149{
150 struct ttm_resource_cursor cursor;
151 struct ttm_resource_manager *man;
152 struct ttm_resource *res;
153 unsigned i;
154 int ret;
155
156 spin_lock(&bdev->lru_lock);
157 for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
158 man = ttm_manager_type(bdev, i);
159 if (!man || !man->use_tt)
160 continue;
161
162 ttm_resource_manager_for_each_res(man, &cursor, res) {
163 struct ttm_buffer_object *bo = res->bo;
164 uint32_t num_pages;
165
166 if (!bo || bo->resource != res)
167 continue;
168
169 num_pages = PFN_UP(bo->base.size);
170 ret = ttm_bo_swapout(bo, ctx, gfp_flags);
171 /* ttm_bo_swapout has dropped the lru_lock */
172 if (!ret)
173 return num_pages;
174 if (ret != -EBUSY)
175 return ret;
176 }
177 }
178 spin_unlock(&bdev->lru_lock);
179 return 0;
180}
181EXPORT_SYMBOL(ttm_device_swapout);
182
183/**
184 * ttm_device_init
185 *
186 * @bdev: A pointer to a struct ttm_device to initialize.
187 * @funcs: Function table for the device.
188 * @dev: The core kernel device pointer for DMA mappings and allocations.
189 * @mapping: The address space to use for this bo.
190 * @vma_manager: A pointer to a vma manager.
191 * @use_dma_alloc: If coherent DMA allocation API should be used.
192 * @use_dma32: If we should use GFP_DMA32 for device memory allocations.
193 *
194 * Initializes a struct ttm_device:
195 * Returns:
196 * !0: Failure.
197 */
198int ttm_device_init(struct ttm_device *bdev, const struct ttm_device_funcs *funcs,
199 struct device *dev, struct address_space *mapping,
200 struct drm_vma_offset_manager *vma_manager,
201 bool use_dma_alloc, bool use_dma32)
202{
203 struct ttm_global *glob = &ttm_glob;
204 int ret, nid;
205
206 if (WARN_ON(vma_manager == NULL))
207 return -EINVAL;
208
209 ret = ttm_global_init();
210 if (ret)
211 return ret;
212
213 bdev->wq = alloc_workqueue("ttm",
214 WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_UNBOUND, 16);
215 if (!bdev->wq) {
216 ttm_global_release();
217 return -ENOMEM;
218 }
219
220 bdev->funcs = funcs;
221
222 ttm_sys_man_init(bdev);
223
224 if (dev)
225 nid = dev_to_node(dev);
226 else
227 nid = NUMA_NO_NODE;
228
229 ttm_pool_init(&bdev->pool, dev, nid, use_dma_alloc, use_dma32);
230
231 bdev->vma_manager = vma_manager;
232 spin_lock_init(&bdev->lru_lock);
233 INIT_LIST_HEAD(&bdev->pinned);
234 bdev->dev_mapping = mapping;
235 mutex_lock(&ttm_global_mutex);
236 list_add_tail(&bdev->device_list, &glob->device_list);
237 mutex_unlock(&ttm_global_mutex);
238
239 return 0;
240}
241EXPORT_SYMBOL(ttm_device_init);
242
243void ttm_device_fini(struct ttm_device *bdev)
244{
245 struct ttm_resource_manager *man;
246 unsigned i;
247
248 mutex_lock(&ttm_global_mutex);
249 list_del(&bdev->device_list);
250 mutex_unlock(&ttm_global_mutex);
251
252 drain_workqueue(bdev->wq);
253 destroy_workqueue(bdev->wq);
254
255 man = ttm_manager_type(bdev, TTM_PL_SYSTEM);
256 ttm_resource_manager_set_used(man, false);
257 ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, NULL);
258
259 spin_lock(&bdev->lru_lock);
260 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
261 if (list_empty(&man->lru[0]))
262 pr_debug("Swap list %d was clean\n", i);
263 spin_unlock(&bdev->lru_lock);
264
265 ttm_pool_fini(&bdev->pool);
266 ttm_global_release();
267}
268EXPORT_SYMBOL(ttm_device_fini);
269
270static void ttm_device_clear_lru_dma_mappings(struct ttm_device *bdev,
271 struct list_head *list)
272{
273 struct ttm_resource *res;
274
275 spin_lock(&bdev->lru_lock);
276 while ((res = list_first_entry_or_null(list, typeof(*res), lru))) {
277 struct ttm_buffer_object *bo = res->bo;
278
279 /* Take ref against racing releases once lru_lock is unlocked */
280 if (!ttm_bo_get_unless_zero(bo))
281 continue;
282
283 list_del_init(&res->lru);
284 spin_unlock(&bdev->lru_lock);
285
286 if (bo->ttm)
287 ttm_tt_unpopulate(bo->bdev, bo->ttm);
288
289 ttm_bo_put(bo);
290 spin_lock(&bdev->lru_lock);
291 }
292 spin_unlock(&bdev->lru_lock);
293}
294
295void ttm_device_clear_dma_mappings(struct ttm_device *bdev)
296{
297 struct ttm_resource_manager *man;
298 unsigned int i, j;
299
300 ttm_device_clear_lru_dma_mappings(bdev, &bdev->pinned);
301
302 for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
303 man = ttm_manager_type(bdev, i);
304 if (!man || !man->use_tt)
305 continue;
306
307 for (j = 0; j < TTM_MAX_BO_PRIORITY; ++j)
308 ttm_device_clear_lru_dma_mappings(bdev, &man->lru[j]);
309 }
310}
311EXPORT_SYMBOL(ttm_device_clear_dma_mappings);
1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2
3/*
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * Copyright 2020 Advanced Micro Devices, Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
24 *
25 * Authors: Christian König
26 */
27
28#define pr_fmt(fmt) "[TTM DEVICE] " fmt
29
30#include <linux/debugfs.h>
31#include <linux/mm.h>
32
33#include <drm/ttm/ttm_bo.h>
34#include <drm/ttm/ttm_device.h>
35#include <drm/ttm/ttm_tt.h>
36#include <drm/ttm/ttm_placement.h>
37
38#include "ttm_module.h"
39
40/*
41 * ttm_global_mutex - protecting the global state
42 */
43static DEFINE_MUTEX(ttm_global_mutex);
44static unsigned ttm_glob_use_count;
45struct ttm_global ttm_glob;
46EXPORT_SYMBOL(ttm_glob);
47
48struct dentry *ttm_debugfs_root;
49
50static void ttm_global_release(void)
51{
52 struct ttm_global *glob = &ttm_glob;
53
54 mutex_lock(&ttm_global_mutex);
55 if (--ttm_glob_use_count > 0)
56 goto out;
57
58 ttm_pool_mgr_fini();
59 debugfs_remove(ttm_debugfs_root);
60
61 __free_page(glob->dummy_read_page);
62 memset(glob, 0, sizeof(*glob));
63out:
64 mutex_unlock(&ttm_global_mutex);
65}
66
67static int ttm_global_init(void)
68{
69 struct ttm_global *glob = &ttm_glob;
70 unsigned long num_pages, num_dma32;
71 struct sysinfo si;
72 int ret = 0;
73
74 mutex_lock(&ttm_global_mutex);
75 if (++ttm_glob_use_count > 1)
76 goto out;
77
78 si_meminfo(&si);
79
80 ttm_debugfs_root = debugfs_create_dir("ttm", NULL);
81 if (IS_ERR(ttm_debugfs_root)) {
82 ttm_debugfs_root = NULL;
83 }
84
85 /* Limit the number of pages in the pool to about 50% of the total
86 * system memory.
87 */
88 num_pages = ((u64)si.totalram * si.mem_unit) >> PAGE_SHIFT;
89 num_pages /= 2;
90
91 /* But for DMA32 we limit ourself to only use 2GiB maximum. */
92 num_dma32 = (u64)(si.totalram - si.totalhigh) * si.mem_unit
93 >> PAGE_SHIFT;
94 num_dma32 = min(num_dma32, 2UL << (30 - PAGE_SHIFT));
95
96 ttm_pool_mgr_init(num_pages);
97 ttm_tt_mgr_init(num_pages, num_dma32);
98
99 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32 |
100 __GFP_NOWARN);
101
102 /* Retry without GFP_DMA32 for platforms DMA32 is not available */
103 if (unlikely(glob->dummy_read_page == NULL)) {
104 glob->dummy_read_page = alloc_page(__GFP_ZERO);
105 if (unlikely(glob->dummy_read_page == NULL)) {
106 ret = -ENOMEM;
107 goto out;
108 }
109 pr_warn("Using GFP_DMA32 fallback for dummy_read_page\n");
110 }
111
112 INIT_LIST_HEAD(&glob->device_list);
113 atomic_set(&glob->bo_count, 0);
114
115 debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root,
116 &glob->bo_count);
117out:
118 if (ret && ttm_debugfs_root)
119 debugfs_remove(ttm_debugfs_root);
120 if (ret)
121 --ttm_glob_use_count;
122 mutex_unlock(&ttm_global_mutex);
123 return ret;
124}
125
126/*
127 * A buffer object shrink method that tries to swap out the first
128 * buffer object on the global::swap_lru list.
129 */
130int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags)
131{
132 struct ttm_global *glob = &ttm_glob;
133 struct ttm_device *bdev;
134 int ret = 0;
135
136 mutex_lock(&ttm_global_mutex);
137 list_for_each_entry(bdev, &glob->device_list, device_list) {
138 ret = ttm_device_swapout(bdev, ctx, gfp_flags);
139 if (ret > 0) {
140 list_move_tail(&bdev->device_list, &glob->device_list);
141 break;
142 }
143 }
144 mutex_unlock(&ttm_global_mutex);
145 return ret;
146}
147
148int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
149 gfp_t gfp_flags)
150{
151 struct ttm_resource_manager *man;
152 unsigned i;
153 s64 lret;
154
155 for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
156 man = ttm_manager_type(bdev, i);
157 if (!man || !man->use_tt)
158 continue;
159
160 lret = ttm_bo_swapout(bdev, ctx, man, gfp_flags, 1);
161 /* Can be both positive (num_pages) and negative (error) */
162 if (lret)
163 return lret;
164 }
165 return 0;
166}
167EXPORT_SYMBOL(ttm_device_swapout);
168
169/**
170 * ttm_device_init
171 *
172 * @bdev: A pointer to a struct ttm_device to initialize.
173 * @funcs: Function table for the device.
174 * @dev: The core kernel device pointer for DMA mappings and allocations.
175 * @mapping: The address space to use for this bo.
176 * @vma_manager: A pointer to a vma manager.
177 * @use_dma_alloc: If coherent DMA allocation API should be used.
178 * @use_dma32: If we should use GFP_DMA32 for device memory allocations.
179 *
180 * Initializes a struct ttm_device:
181 * Returns:
182 * !0: Failure.
183 */
184int ttm_device_init(struct ttm_device *bdev, const struct ttm_device_funcs *funcs,
185 struct device *dev, struct address_space *mapping,
186 struct drm_vma_offset_manager *vma_manager,
187 bool use_dma_alloc, bool use_dma32)
188{
189 struct ttm_global *glob = &ttm_glob;
190 int ret, nid;
191
192 if (WARN_ON(vma_manager == NULL))
193 return -EINVAL;
194
195 ret = ttm_global_init();
196 if (ret)
197 return ret;
198
199 bdev->wq = alloc_workqueue("ttm",
200 WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_UNBOUND, 16);
201 if (!bdev->wq) {
202 ttm_global_release();
203 return -ENOMEM;
204 }
205
206 bdev->funcs = funcs;
207
208 ttm_sys_man_init(bdev);
209
210 if (dev)
211 nid = dev_to_node(dev);
212 else
213 nid = NUMA_NO_NODE;
214
215 ttm_pool_init(&bdev->pool, dev, nid, use_dma_alloc, use_dma32);
216
217 bdev->vma_manager = vma_manager;
218 spin_lock_init(&bdev->lru_lock);
219 INIT_LIST_HEAD(&bdev->unevictable);
220 bdev->dev_mapping = mapping;
221 mutex_lock(&ttm_global_mutex);
222 list_add_tail(&bdev->device_list, &glob->device_list);
223 mutex_unlock(&ttm_global_mutex);
224
225 return 0;
226}
227EXPORT_SYMBOL(ttm_device_init);
228
229void ttm_device_fini(struct ttm_device *bdev)
230{
231 struct ttm_resource_manager *man;
232 unsigned i;
233
234 mutex_lock(&ttm_global_mutex);
235 list_del(&bdev->device_list);
236 mutex_unlock(&ttm_global_mutex);
237
238 drain_workqueue(bdev->wq);
239 destroy_workqueue(bdev->wq);
240
241 man = ttm_manager_type(bdev, TTM_PL_SYSTEM);
242 ttm_resource_manager_set_used(man, false);
243 ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, NULL);
244
245 spin_lock(&bdev->lru_lock);
246 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
247 if (list_empty(&man->lru[0]))
248 pr_debug("Swap list %d was clean\n", i);
249 spin_unlock(&bdev->lru_lock);
250
251 ttm_pool_fini(&bdev->pool);
252 ttm_global_release();
253}
254EXPORT_SYMBOL(ttm_device_fini);
255
256static void ttm_device_clear_lru_dma_mappings(struct ttm_device *bdev,
257 struct list_head *list)
258{
259 struct ttm_resource *res;
260
261 spin_lock(&bdev->lru_lock);
262 while ((res = ttm_lru_first_res_or_null(list))) {
263 struct ttm_buffer_object *bo = res->bo;
264
265 /* Take ref against racing releases once lru_lock is unlocked */
266 if (!ttm_bo_get_unless_zero(bo))
267 continue;
268
269 list_del_init(&bo->resource->lru.link);
270 spin_unlock(&bdev->lru_lock);
271
272 if (bo->ttm)
273 ttm_tt_unpopulate(bo->bdev, bo->ttm);
274
275 ttm_bo_put(bo);
276 spin_lock(&bdev->lru_lock);
277 }
278 spin_unlock(&bdev->lru_lock);
279}
280
281void ttm_device_clear_dma_mappings(struct ttm_device *bdev)
282{
283 struct ttm_resource_manager *man;
284 unsigned int i, j;
285
286 ttm_device_clear_lru_dma_mappings(bdev, &bdev->unevictable);
287
288 for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
289 man = ttm_manager_type(bdev, i);
290 if (!man || !man->use_tt)
291 continue;
292
293 for (j = 0; j < TTM_MAX_BO_PRIORITY; ++j)
294 ttm_device_clear_lru_dma_mappings(bdev, &man->lru[j]);
295 }
296}
297EXPORT_SYMBOL(ttm_device_clear_dma_mappings);