1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * Copyright 2020 Advanced Micro Devices, Inc.
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:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
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.
25 * Authors: Christian König
28 #define pr_fmt(fmt) "[TTM DEVICE] " fmt
32 #include <drm/ttm/ttm_device.h>
33 #include <drm/ttm/ttm_tt.h>
34 #include <drm/ttm/ttm_placement.h>
35 #include <drm/ttm/ttm_bo_api.h>
37 #include "ttm_module.h"
40 * ttm_global_mutex - protecting the global state
42 DEFINE_MUTEX(ttm_global_mutex);
43 unsigned ttm_glob_use_count;
44 struct ttm_global ttm_glob;
45 EXPORT_SYMBOL(ttm_glob);
47 static void ttm_global_release(void)
49 struct ttm_global *glob = &ttm_glob;
51 mutex_lock(&ttm_global_mutex);
52 if (--ttm_glob_use_count > 0)
57 __free_page(glob->dummy_read_page);
58 memset(glob, 0, sizeof(*glob));
60 mutex_unlock(&ttm_global_mutex);
63 static int ttm_global_init(void)
65 struct ttm_global *glob = &ttm_glob;
66 unsigned long num_pages, num_dma32;
70 mutex_lock(&ttm_global_mutex);
71 if (++ttm_glob_use_count > 1)
76 /* Limit the number of pages in the pool to about 50% of the total
79 num_pages = ((u64)si.totalram * si.mem_unit) >> PAGE_SHIFT;
82 /* But for DMA32 we limit ourself to only use 2GiB maximum. */
83 num_dma32 = (u64)(si.totalram - si.totalhigh) * si.mem_unit
85 num_dma32 = min(num_dma32, 2UL << (30 - PAGE_SHIFT));
87 ttm_pool_mgr_init(num_pages);
88 ttm_tt_mgr_init(num_pages, num_dma32);
90 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
92 if (unlikely(glob->dummy_read_page == NULL)) {
97 INIT_LIST_HEAD(&glob->device_list);
98 atomic_set(&glob->bo_count, 0);
100 debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root,
103 mutex_unlock(&ttm_global_mutex);
108 * A buffer object shrink method that tries to swap out the first
109 * buffer object on the global::swap_lru list.
111 int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags)
113 struct ttm_global *glob = &ttm_glob;
114 struct ttm_device *bdev;
117 mutex_lock(&ttm_global_mutex);
118 list_for_each_entry(bdev, &glob->device_list, device_list) {
119 ret = ttm_device_swapout(bdev, ctx, gfp_flags);
121 list_move_tail(&bdev->device_list, &glob->device_list);
125 mutex_unlock(&ttm_global_mutex);
128 EXPORT_SYMBOL(ttm_global_swapout);
130 int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
133 struct ttm_resource_manager *man;
134 struct ttm_buffer_object *bo;
138 spin_lock(&bdev->lru_lock);
139 for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
140 man = ttm_manager_type(bdev, i);
141 if (!man || !man->use_tt)
144 for (j = 0; j < TTM_MAX_BO_PRIORITY; ++j) {
145 list_for_each_entry(bo, &man->lru[j], lru) {
149 bo->ttm->page_flags & TTM_PAGE_FLAG_SG ||
150 bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)
153 num_pages = bo->ttm->num_pages;
154 ret = ttm_bo_swapout(bo, ctx, gfp_flags);
155 /* ttm_bo_swapout has dropped the lru_lock */
163 spin_unlock(&bdev->lru_lock);
166 EXPORT_SYMBOL(ttm_device_swapout);
168 static void ttm_init_sysman(struct ttm_device *bdev)
170 struct ttm_resource_manager *man = &bdev->sysman;
173 * Initialize the system memory buffer type.
174 * Other types need to be driver / IOCTL initialized.
178 ttm_resource_manager_init(man, 0);
179 ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, man);
180 ttm_resource_manager_set_used(man, true);
183 static void ttm_device_delayed_workqueue(struct work_struct *work)
185 struct ttm_device *bdev =
186 container_of(work, struct ttm_device, wq.work);
188 if (!ttm_bo_delayed_delete(bdev, false))
189 schedule_delayed_work(&bdev->wq,
190 ((HZ / 100) < 1) ? 1 : HZ / 100);
196 * @bdev: A pointer to a struct ttm_device to initialize.
197 * @funcs: Function table for the device.
198 * @dev: The core kernel device pointer for DMA mappings and allocations.
199 * @mapping: The address space to use for this bo.
200 * @vma_manager: A pointer to a vma manager.
201 * @use_dma_alloc: If coherent DMA allocation API should be used.
202 * @use_dma32: If we should use GFP_DMA32 for device memory allocations.
204 * Initializes a struct ttm_device:
208 int ttm_device_init(struct ttm_device *bdev, struct ttm_device_funcs *funcs,
209 struct device *dev, struct address_space *mapping,
210 struct drm_vma_offset_manager *vma_manager,
211 bool use_dma_alloc, bool use_dma32)
213 struct ttm_global *glob = &ttm_glob;
216 if (WARN_ON(vma_manager == NULL))
219 ret = ttm_global_init();
225 ttm_init_sysman(bdev);
226 ttm_pool_init(&bdev->pool, dev, use_dma_alloc, use_dma32);
228 bdev->vma_manager = vma_manager;
229 INIT_DELAYED_WORK(&bdev->wq, ttm_device_delayed_workqueue);
230 spin_lock_init(&bdev->lru_lock);
231 INIT_LIST_HEAD(&bdev->ddestroy);
232 bdev->dev_mapping = mapping;
233 mutex_lock(&ttm_global_mutex);
234 list_add_tail(&bdev->device_list, &glob->device_list);
235 mutex_unlock(&ttm_global_mutex);
239 EXPORT_SYMBOL(ttm_device_init);
241 void ttm_device_fini(struct ttm_device *bdev)
243 struct ttm_resource_manager *man;
246 man = ttm_manager_type(bdev, TTM_PL_SYSTEM);
247 ttm_resource_manager_set_used(man, false);
248 ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, NULL);
250 mutex_lock(&ttm_global_mutex);
251 list_del(&bdev->device_list);
252 mutex_unlock(&ttm_global_mutex);
254 cancel_delayed_work_sync(&bdev->wq);
256 if (ttm_bo_delayed_delete(bdev, true))
257 pr_debug("Delayed destroy list was clean\n");
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);
265 ttm_pool_fini(&bdev->pool);
266 ttm_global_release();
268 EXPORT_SYMBOL(ttm_device_fini);