drivers/gpu/drm/ttm/ttm_device.c

   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
  71         mutex_lock(&ttm_global_mutex);
  72         if (++ttm_glob_use_count > 1)
  73                 goto out;
  74
  75         si_meminfo(&si);
  76
  77         /* Limit the number of pages in the pool to about 50% of the total
  78          * system memory.
  79          */
  80         num_pages = ((u64)si.totalram * si.mem_unit) >> PAGE_SHIFT;
  81         ttm_pool_mgr_init(num_pages * 50 / 100);
  82         ttm_tt_mgr_init();
  83
  84         glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
  85
  86         if (unlikely(glob->dummy_read_page == NULL)) {
  87                 ret = -ENOMEM;
  88                 goto out;
  89         }
  90
  91         INIT_LIST_HEAD(&glob->device_list);
  92         atomic_set(&glob->bo_count, 0);
  93
  94         debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root,
  95                                 &glob->bo_count);
  96 out:
  97         mutex_unlock(&ttm_global_mutex);
  98         return ret;
  99 }
 100
 101 /**
 102  * A buffer object shrink method that tries to swap out the first
 103  * buffer object on the global::swap_lru list.
 104  */
 105 int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags)
 106 {
 107         struct ttm_global *glob = &ttm_glob;
 108         struct ttm_device *bdev;
 109         int ret = -EBUSY;
 110
 111         mutex_lock(&ttm_global_mutex);
 112         list_for_each_entry(bdev, &glob->device_list, device_list) {
 113                 ret = ttm_device_swapout(bdev, ctx, gfp_flags);
 114                 if (ret > 0) {
 115                         list_move_tail(&bdev->device_list, &glob->device_list);
 116                         break;
 117                 }
 118         }
 119         mutex_unlock(&ttm_global_mutex);
 120         return ret;
 121 }
 122 EXPORT_SYMBOL(ttm_global_swapout);
 123
 124 int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
 125                        gfp_t gfp_flags)
 126 {
 127         struct ttm_resource_manager *man;
 128         struct ttm_buffer_object *bo;
 129         unsigned i, j;
 130         int ret;
 131
 132         spin_lock(&bdev->lru_lock);
 133         for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
 134                 man = ttm_manager_type(bdev, i);
 135                 if (!man || !man->use_tt)
 136                         continue;
 137
 138                 for (j = 0; j < TTM_MAX_BO_PRIORITY; ++j) {
 139                         list_for_each_entry(bo, &man->lru[j], lru) {
 140                                 uint32_t num_pages;
 141
 142                                 if (!bo->ttm ||
 143                                     bo->ttm->page_flags & TTM_PAGE_FLAG_SG ||
 144                                     bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)
 145                                         continue;
 146
 147                                 num_pages = bo->ttm->num_pages;
 148                                 ret = ttm_bo_swapout(bo, ctx, gfp_flags);
 149                                 /* ttm_bo_swapout has dropped the lru_lock */
 150                                 if (!ret)
 151                                         return num_pages;
 152                                 if (ret != -EBUSY)
 153                                         return ret;
 154                         }
 155                 }
 156         }
 157         spin_unlock(&bdev->lru_lock);
 158         return 0;
 159 }
 160 EXPORT_SYMBOL(ttm_device_swapout);
 161
 162 static void ttm_init_sysman(struct ttm_device *bdev)
 163 {
 164         struct ttm_resource_manager *man = &bdev->sysman;
 165
 166         /*
 167          * Initialize the system memory buffer type.
 168          * Other types need to be driver / IOCTL initialized.
 169          */
 170         man->use_tt = true;
 171
 172         ttm_resource_manager_init(man, 0);
 173         ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, man);
 174         ttm_resource_manager_set_used(man, true);
 175 }
 176
 177 static void ttm_device_delayed_workqueue(struct work_struct *work)
 178 {
 179         struct ttm_device *bdev =
 180                 container_of(work, struct ttm_device, wq.work);
 181
 182         if (!ttm_bo_delayed_delete(bdev, false))
 183                 schedule_delayed_work(&bdev->wq,
 184                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 185 }
 186
 187 /**
 188  * ttm_device_init
 189  *
 190  * @bdev: A pointer to a struct ttm_device to initialize.
 191  * @funcs: Function table for the device.
 192  * @dev: The core kernel device pointer for DMA mappings and allocations.
 193  * @mapping: The address space to use for this bo.
 194  * @vma_manager: A pointer to a vma manager.
 195  * @use_dma_alloc: If coherent DMA allocation API should be used.
 196  * @use_dma32: If we should use GFP_DMA32 for device memory allocations.
 197  *
 198  * Initializes a struct ttm_device:
 199  * Returns:
 200  * !0: Failure.
 201  */
 202 int ttm_device_init(struct ttm_device *bdev, struct ttm_device_funcs *funcs,
 203                     struct device *dev, struct address_space *mapping,
 204                     struct drm_vma_offset_manager *vma_manager,
 205                     bool use_dma_alloc, bool use_dma32)
 206 {
 207         struct ttm_global *glob = &ttm_glob;
 208         int ret;
 209
 210         if (WARN_ON(vma_manager == NULL))
 211                 return -EINVAL;
 212
 213         ret = ttm_global_init();
 214         if (ret)
 215                 return ret;
 216
 217         bdev->funcs = funcs;
 218
 219         ttm_init_sysman(bdev);
 220         ttm_pool_init(&bdev->pool, dev, use_dma_alloc, use_dma32);
 221
 222         bdev->vma_manager = vma_manager;
 223         INIT_DELAYED_WORK(&bdev->wq, ttm_device_delayed_workqueue);
 224         spin_lock_init(&bdev->lru_lock);
 225         INIT_LIST_HEAD(&bdev->ddestroy);
 226         bdev->dev_mapping = mapping;
 227         mutex_lock(&ttm_global_mutex);
 228         list_add_tail(&bdev->device_list, &glob->device_list);
 229         mutex_unlock(&ttm_global_mutex);
 230
 231         return 0;
 232 }
 233 EXPORT_SYMBOL(ttm_device_init);
 234
 235 void ttm_device_fini(struct ttm_device *bdev)
 236 {
 237         struct ttm_resource_manager *man;
 238         unsigned i;
 239
 240         man = ttm_manager_type(bdev, TTM_PL_SYSTEM);
 241         ttm_resource_manager_set_used(man, false);
 242         ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, NULL);
 243
 244         mutex_lock(&ttm_global_mutex);
 245         list_del(&bdev->device_list);
 246         mutex_unlock(&ttm_global_mutex);
 247
 248         cancel_delayed_work_sync(&bdev->wq);
 249
 250         if (ttm_bo_delayed_delete(bdev, true))
 251                 pr_debug("Delayed destroy list was clean\n");
 252
 253         spin_lock(&bdev->lru_lock);
 254         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
 255                 if (list_empty(&man->lru[0]))
 256                         pr_debug("Swap list %d was clean\n", i);
 257         spin_unlock(&bdev->lru_lock);
 258
 259         ttm_pool_fini(&bdev->pool);
 260         ttm_global_release();
 261 }
 262 EXPORT_SYMBOL(ttm_device_fini);