Rob Clark | 6820939 | 2016-05-17 16:19:32 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 Red Hat |
| 3 | * Author: Rob Clark <robdclark@gmail.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 as published by |
| 7 | * the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include "msm_drv.h" |
| 19 | #include "msm_gem.h" |
| 20 | |
| 21 | static bool mutex_is_locked_by(struct mutex *mutex, struct task_struct *task) |
| 22 | { |
| 23 | if (!mutex_is_locked(mutex)) |
| 24 | return false; |
| 25 | |
| 26 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_MUTEXES) |
| 27 | return mutex->owner == task; |
| 28 | #else |
| 29 | /* Since UP may be pre-empted, we cannot assume that we own the lock */ |
| 30 | return false; |
| 31 | #endif |
| 32 | } |
| 33 | |
| 34 | static bool msm_gem_shrinker_lock(struct drm_device *dev, bool *unlock) |
| 35 | { |
| 36 | if (!mutex_trylock(&dev->struct_mutex)) { |
| 37 | if (!mutex_is_locked_by(&dev->struct_mutex, current)) |
| 38 | return false; |
| 39 | *unlock = false; |
| 40 | } else { |
| 41 | *unlock = true; |
| 42 | } |
| 43 | |
| 44 | return true; |
| 45 | } |
| 46 | |
| 47 | |
| 48 | static unsigned long |
| 49 | msm_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) |
| 50 | { |
| 51 | struct msm_drm_private *priv = |
| 52 | container_of(shrinker, struct msm_drm_private, shrinker); |
| 53 | struct drm_device *dev = priv->dev; |
| 54 | struct msm_gem_object *msm_obj; |
| 55 | unsigned long count = 0; |
| 56 | bool unlock; |
| 57 | |
| 58 | if (!msm_gem_shrinker_lock(dev, &unlock)) |
| 59 | return 0; |
| 60 | |
| 61 | list_for_each_entry(msm_obj, &priv->inactive_list, mm_list) { |
| 62 | if (is_purgeable(msm_obj)) |
| 63 | count += msm_obj->base.size >> PAGE_SHIFT; |
| 64 | } |
| 65 | |
| 66 | if (unlock) |
| 67 | mutex_unlock(&dev->struct_mutex); |
| 68 | |
| 69 | return count; |
| 70 | } |
| 71 | |
| 72 | static unsigned long |
| 73 | msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) |
| 74 | { |
| 75 | struct msm_drm_private *priv = |
| 76 | container_of(shrinker, struct msm_drm_private, shrinker); |
| 77 | struct drm_device *dev = priv->dev; |
| 78 | struct msm_gem_object *msm_obj; |
| 79 | unsigned long freed = 0; |
| 80 | bool unlock; |
| 81 | |
| 82 | if (!msm_gem_shrinker_lock(dev, &unlock)) |
| 83 | return SHRINK_STOP; |
| 84 | |
| 85 | list_for_each_entry(msm_obj, &priv->inactive_list, mm_list) { |
| 86 | if (freed >= sc->nr_to_scan) |
| 87 | break; |
| 88 | if (is_purgeable(msm_obj)) { |
| 89 | msm_gem_purge(&msm_obj->base); |
| 90 | freed += msm_obj->base.size >> PAGE_SHIFT; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | if (unlock) |
| 95 | mutex_unlock(&dev->struct_mutex); |
| 96 | |
| 97 | if (freed > 0) |
| 98 | pr_info_ratelimited("Purging %lu bytes\n", freed << PAGE_SHIFT); |
| 99 | |
| 100 | return freed; |
| 101 | } |
| 102 | |
Rob Clark | e1e9db2 | 2016-05-27 11:16:28 -0400 | [diff] [blame] | 103 | static int |
| 104 | msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr) |
| 105 | { |
| 106 | struct msm_drm_private *priv = |
| 107 | container_of(nb, struct msm_drm_private, vmap_notifier); |
| 108 | struct drm_device *dev = priv->dev; |
| 109 | struct msm_gem_object *msm_obj; |
| 110 | unsigned unmapped = 0; |
| 111 | bool unlock; |
| 112 | |
| 113 | if (!msm_gem_shrinker_lock(dev, &unlock)) |
| 114 | return NOTIFY_DONE; |
| 115 | |
| 116 | list_for_each_entry(msm_obj, &priv->inactive_list, mm_list) { |
| 117 | if (is_vunmapable(msm_obj)) { |
| 118 | msm_gem_vunmap(&msm_obj->base); |
| 119 | /* since we don't know any better, lets bail after a few |
| 120 | * and if necessary the shrinker will be invoked again. |
| 121 | * Seems better than unmapping *everything* |
| 122 | */ |
| 123 | if (++unmapped >= 15) |
| 124 | break; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | if (unlock) |
| 129 | mutex_unlock(&dev->struct_mutex); |
| 130 | |
| 131 | *(unsigned long *)ptr += unmapped; |
| 132 | |
| 133 | if (unmapped > 0) |
| 134 | pr_info_ratelimited("Purging %u vmaps\n", unmapped); |
| 135 | |
| 136 | return NOTIFY_DONE; |
| 137 | } |
| 138 | |
Rob Clark | 6820939 | 2016-05-17 16:19:32 -0400 | [diff] [blame] | 139 | /** |
| 140 | * msm_gem_shrinker_init - Initialize msm shrinker |
| 141 | * @dev_priv: msm device |
| 142 | * |
| 143 | * This function registers and sets up the msm shrinker. |
| 144 | */ |
| 145 | void msm_gem_shrinker_init(struct drm_device *dev) |
| 146 | { |
| 147 | struct msm_drm_private *priv = dev->dev_private; |
| 148 | priv->shrinker.count_objects = msm_gem_shrinker_count; |
| 149 | priv->shrinker.scan_objects = msm_gem_shrinker_scan; |
| 150 | priv->shrinker.seeks = DEFAULT_SEEKS; |
| 151 | WARN_ON(register_shrinker(&priv->shrinker)); |
Rob Clark | e1e9db2 | 2016-05-27 11:16:28 -0400 | [diff] [blame] | 152 | |
| 153 | priv->vmap_notifier.notifier_call = msm_gem_shrinker_vmap; |
| 154 | WARN_ON(register_vmap_purge_notifier(&priv->vmap_notifier)); |
Rob Clark | 6820939 | 2016-05-17 16:19:32 -0400 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | /** |
| 158 | * msm_gem_shrinker_cleanup - Clean up msm shrinker |
| 159 | * @dev_priv: msm device |
| 160 | * |
| 161 | * This function unregisters the msm shrinker. |
| 162 | */ |
| 163 | void msm_gem_shrinker_cleanup(struct drm_device *dev) |
| 164 | { |
| 165 | struct msm_drm_private *priv = dev->dev_private; |
Rob Clark | e1e9db2 | 2016-05-27 11:16:28 -0400 | [diff] [blame] | 166 | WARN_ON(unregister_vmap_purge_notifier(&priv->vmap_notifier)); |
Rob Clark | 6820939 | 2016-05-17 16:19:32 -0400 | [diff] [blame] | 167 | unregister_shrinker(&priv->shrinker); |
| 168 | } |