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         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 /**
 106  * A buffer object shrink method that tries to swap out the first
 107  * buffer object on the global::swap_lru list.
 108  */
 109 int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags)
 110 {
 111         struct ttm_global *glob = &ttm_glob;
 112         struct ttm_buffer_object *bo;
 113         unsigned i;
 114         int ret;
 115
 116         spin_lock(&glob->lru_lock);
 117         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
 118                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
 119                         uint32_t num_pages = bo->ttm->num_pages;
 120
 121                         ret = ttm_bo_swapout(bo, ctx, gfp_flags);
 122                         /* ttm_bo_swapout has dropped the lru_lock */
 123                         if (!ret)
 124                                 return num_pages;
 125                         if (ret != -EBUSY)
 126                                 return ret;
 127                 }
 128         }
 129         spin_unlock(&glob->lru_lock);
 130         return 0;
 131 }
 132 EXPORT_SYMBOL(ttm_global_swapout);
 133
 134 static void ttm_init_sysman(struct ttm_device *bdev)
 135 {
 136         struct ttm_resource_manager *man = &bdev->sysman;
 137
 138         /*
 139          * Initialize the system memory buffer type.
 140          * Other types need to be driver / IOCTL initialized.
 141          */
 142         man->use_tt = true;
 143
 144         ttm_resource_manager_init(man, 0);
 145         ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, man);
 146         ttm_resource_manager_set_used(man, true);
 147 }
 148
 149 static void ttm_device_delayed_workqueue(struct work_struct *work)
 150 {
 151         struct ttm_device *bdev =
 152                 container_of(work, struct ttm_device, wq.work);
 153
 154         if (!ttm_bo_delayed_delete(bdev, false))
 155                 schedule_delayed_work(&bdev->wq,
 156                                       ((HZ / 100) < 1) ? 1 : HZ / 100);
 157 }
 158
 159 /**
 160  * ttm_device_init
 161  *
 162  * @bdev: A pointer to a struct ttm_device to initialize.
 163  * @funcs: Function table for the device.
 164  * @dev: The core kernel device pointer for DMA mappings and allocations.
 165  * @mapping: The address space to use for this bo.
 166  * @vma_manager: A pointer to a vma manager.
 167  * @use_dma_alloc: If coherent DMA allocation API should be used.
 168  * @use_dma32: If we should use GFP_DMA32 for device memory allocations.
 169  *
 170  * Initializes a struct ttm_device:
 171  * Returns:
 172  * !0: Failure.
 173  */
 174 int ttm_device_init(struct ttm_device *bdev, struct ttm_device_funcs *funcs,
 175                     struct device *dev, struct address_space *mapping,
 176                     struct drm_vma_offset_manager *vma_manager,
 177                     bool use_dma_alloc, bool use_dma32)
 178 {
 179         struct ttm_global *glob = &ttm_glob;
 180         int ret;
 181
 182         if (WARN_ON(vma_manager == NULL))
 183                 return -EINVAL;
 184
 185         ret = ttm_global_init();
 186         if (ret)
 187                 return ret;
 188
 189         bdev->funcs = funcs;
 190
 191         ttm_init_sysman(bdev);
 192         ttm_pool_init(&bdev->pool, dev, use_dma_alloc, use_dma32);
 193
 194         bdev->vma_manager = vma_manager;
 195         INIT_DELAYED_WORK(&bdev->wq, ttm_device_delayed_workqueue);
 196         INIT_LIST_HEAD(&bdev->ddestroy);
 197         bdev->dev_mapping = mapping;
 198         mutex_lock(&ttm_global_mutex);
 199         list_add_tail(&bdev->device_list, &glob->device_list);
 200         mutex_unlock(&ttm_global_mutex);
 201
 202         return 0;
 203 }
 204 EXPORT_SYMBOL(ttm_device_init);
 205
 206 void ttm_device_fini(struct ttm_device *bdev)
 207 {
 208         struct ttm_global *glob = &ttm_glob;
 209         struct ttm_resource_manager *man;
 210         unsigned i;
 211
 212         man = ttm_manager_type(bdev, TTM_PL_SYSTEM);
 213         ttm_resource_manager_set_used(man, false);
 214         ttm_set_driver_manager(bdev, TTM_PL_SYSTEM, NULL);
 215
 216         mutex_lock(&ttm_global_mutex);
 217         list_del(&bdev->device_list);
 218         mutex_unlock(&ttm_global_mutex);
 219
 220         cancel_delayed_work_sync(&bdev->wq);
 221
 222         if (ttm_bo_delayed_delete(bdev, true))
 223                 pr_debug("Delayed destroy list was clean\n");
 224
 225         spin_lock(&glob->lru_lock);
 226         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
 227                 if (list_empty(&man->lru[0]))
 228                         pr_debug("Swap list %d was clean\n", i);
 229         spin_unlock(&glob->lru_lock);
 230
 231         ttm_pool_fini(&bdev->pool);
 232         ttm_global_release();
 233 }
 234 EXPORT_SYMBOL(ttm_device_fini);