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_device.h> 33 #include <drm/ttm/ttm_tt.h> 34 #include <drm/ttm/ttm_placement.h> 35 #include <drm/ttm/ttm_bo_api.h> 36 37 #include "ttm_module.h" 38 39 /** 40 * ttm_global_mutex - protecting the global state 41 */ 42 DEFINE_MUTEX(ttm_global_mutex); 43 unsigned ttm_glob_use_count; 44 struct ttm_global ttm_glob; 45 EXPORT_SYMBOL(ttm_glob); 46 47 static void ttm_global_release(void) 48 { 49 struct ttm_global *glob = &ttm_glob; 50 51 mutex_lock(&ttm_global_mutex); 52 if (--ttm_glob_use_count > 0) 53 goto out; 54 55 ttm_pool_mgr_fini(); 56 ttm_tt_mgr_fini(); 57 58 __free_page(glob->dummy_read_page); 59 memset(glob, 0, sizeof(*glob)); 60 out: 61 mutex_unlock(&ttm_global_mutex); 62 } 63 64 static int ttm_global_init(void) 65 { 66 struct ttm_global *glob = &ttm_glob; 67 unsigned long num_pages; 68 struct sysinfo si; 69 int ret = 0; 70 unsigned i; 71 72 mutex_lock(&ttm_global_mutex); 73 if (++ttm_glob_use_count > 1) 74 goto out; 75 76 si_meminfo(&si); 77 78 /* Limit the number of pages in the pool to about 50% of the total 79 * system memory. 80 */ 81 num_pages = ((u64)si.totalram * si.mem_unit) >> PAGE_SHIFT; 82 ttm_pool_mgr_init(num_pages * 50 / 100); 83 ttm_tt_mgr_init(); 84 85 spin_lock_init(&glob->lru_lock); 86 glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32); 87 88 if (unlikely(glob->dummy_read_page == NULL)) { 89 ret = -ENOMEM; 90 goto out; 91 } 92 93 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) 94 INIT_LIST_HEAD(&glob->swap_lru[i]); 95 INIT_LIST_HEAD(&glob->device_list); 96 atomic_set(&glob->bo_count, 0); 97 98 debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root, 99 &glob->bo_count); 100 out: 101 mutex_unlock(&ttm_global_mutex); 102 return ret; 103 } 104 105 static void ttm_init_sysman(struct ttm_device *bdev) 106 { 107 struct ttm_resource_manager *man = &bdev->sysman; 108 109 /* 110 * Initialize the system memory buffer type. 111 * Other types need to be driver / IOCTL initialized. 112 */ 113 man->use_tt = true; 114 115 ttm_resource_manager_init(man, 0); 116 ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, man); 117 ttm_resource_manager_set_used(man, true); 118 } 119 120 static void ttm_device_delayed_workqueue(struct work_struct *work) 121 { 122 struct ttm_device *bdev = 123 container_of(work, struct ttm_device, wq.work); 124 125 if (!ttm_bo_delayed_delete(bdev, false)) 126 schedule_delayed_work(&bdev->wq, 127 ((HZ / 100) < 1) ? 1 : HZ / 100); 128 } 129 130 /** 131 * ttm_device_init 132 * 133 * @bdev: A pointer to a struct ttm_device to initialize. 134 * @funcs: Function table for the device. 135 * @dev: The core kernel device pointer for DMA mappings and allocations. 136 * @mapping: The address space to use for this bo. 137 * @vma_manager: A pointer to a vma manager. 138 * @use_dma_alloc: If coherent DMA allocation API should be used. 139 * @use_dma32: If we should use GFP_DMA32 for device memory allocations. 140 * 141 * Initializes a struct ttm_device: 142 * Returns: 143 * !0: Failure. 144 */ 145 int ttm_device_init(struct ttm_device *bdev, struct ttm_device_funcs *funcs, 146 struct device *dev, struct address_space *mapping, 147 struct drm_vma_offset_manager *vma_manager, 148 bool use_dma_alloc, bool use_dma32) 149 { 150 struct ttm_global *glob = &ttm_glob; 151 int ret; 152 153 if (WARN_ON(vma_manager == NULL)) 154 return -EINVAL; 155 156 ret = ttm_global_init(); 157 if (ret) 158 return ret; 159 160 bdev->funcs = funcs; 161 162 ttm_init_sysman(bdev); 163 ttm_pool_init(&bdev->pool, dev, use_dma_alloc, use_dma32); 164 165 bdev->vma_manager = vma_manager; 166 INIT_DELAYED_WORK(&bdev->wq, ttm_device_delayed_workqueue); 167 INIT_LIST_HEAD(&bdev->ddestroy); 168 bdev->dev_mapping = mapping; 169 mutex_lock(&ttm_global_mutex); 170 list_add_tail(&bdev->device_list, &glob->device_list); 171 mutex_unlock(&ttm_global_mutex); 172 173 return 0; 174 } 175 EXPORT_SYMBOL(ttm_device_init); 176 177 void ttm_device_fini(struct ttm_device *bdev) 178 { 179 struct ttm_global *glob = &ttm_glob; 180 struct ttm_resource_manager *man; 181 unsigned i; 182 183 man = ttm_manager_type(bdev, TTM_PL_SYSTEM); 184 ttm_resource_manager_set_used(man, false); 185 ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, NULL); 186 187 mutex_lock(&ttm_global_mutex); 188 list_del(&bdev->device_list); 189 mutex_unlock(&ttm_global_mutex); 190 191 cancel_delayed_work_sync(&bdev->wq); 192 193 if (ttm_bo_delayed_delete(bdev, true)) 194 pr_debug("Delayed destroy list was clean\n"); 195 196 spin_lock(&glob->lru_lock); 197 for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) 198 if (list_empty(&man->lru[0])) 199 pr_debug("Swap list %d was clean\n", i); 200 spin_unlock(&glob->lru_lock); 201 202 ttm_pool_fini(&bdev->pool); 203 ttm_global_release(); 204 } 205 EXPORT_SYMBOL(ttm_device_fini); 206