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