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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., USA5 * Copyright 2020 Advanced Micro Devices, Inc.6 *7 * Permission is hereby granted, free of charge, to any person obtaining a8 * copy of this software and associated documentation files (the "Software"),9 * to deal in the Software without restriction, including without limitation10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,11 * and/or sell copies of the Software, and to permit persons to whom the12 * Software is furnished to do so, subject to the following conditions:13 *14 * The above copyright notice and this permission notice shall be included in15 * all copies or substantial portions of the Software.16 *17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL20 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR21 * 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 OR23 * OTHER DEALINGS IN THE SOFTWARE.24 *25 * Authors: Christian König26 */27 28#define pr_fmt(fmt) "[TTM DEVICE] " fmt29 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 state42 */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 total86 * 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_unit93 >> 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 first128 * 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_init171 *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 else213 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->pinned);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->pinned);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);298