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Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_shrinker.c')
-rw-r--r--drivers/gpu/drm/i915/i915_gem_shrinker.c504
1 files changed, 0 insertions, 504 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c
deleted file mode 100644
index 1032f98add11..000000000000
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ /dev/null
@@ -1,504 +0,0 @@
-/*
- * Copyright © 2008-2015 Intel Corporation
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- *
- */
-
-#include <linux/oom.h>
-#include <linux/shmem_fs.h>
-#include <linux/slab.h>
-#include <linux/swap.h>
-#include <linux/pci.h>
-#include <linux/dma-buf.h>
-#include <linux/vmalloc.h>
-#include <drm/drmP.h>
-#include <drm/i915_drm.h>
-
-#include "i915_drv.h"
-#include "i915_trace.h"
-
-static bool shrinker_lock(struct drm_i915_private *dev_priv, bool *unlock)
-{
- switch (mutex_trylock_recursive(&dev_priv->drm.struct_mutex)) {
- case MUTEX_TRYLOCK_RECURSIVE:
- *unlock = false;
- return true;
-
- case MUTEX_TRYLOCK_FAILED:
- do {
- cpu_relax();
- if (mutex_trylock(&dev_priv->drm.struct_mutex)) {
- case MUTEX_TRYLOCK_SUCCESS:
- *unlock = true;
- return true;
- }
- } while (!need_resched());
-
- return false;
- }
-
- BUG();
-}
-
-static void shrinker_unlock(struct drm_i915_private *dev_priv, bool unlock)
-{
- if (!unlock)
- return;
-
- mutex_unlock(&dev_priv->drm.struct_mutex);
-}
-
-static bool any_vma_pinned(struct drm_i915_gem_object *obj)
-{
- struct i915_vma *vma;
-
- list_for_each_entry(vma, &obj->vma_list, obj_link) {
- /* Only GGTT vma may be permanently pinned, and are always
- * at the start of the list. We can stop hunting as soon
- * as we see a ppGTT vma.
- */
- if (!i915_vma_is_ggtt(vma))
- break;
-
- if (i915_vma_is_pinned(vma))
- return true;
- }
-
- return false;
-}
-
-static bool swap_available(void)
-{
- return get_nr_swap_pages() > 0;
-}
-
-static bool can_release_pages(struct drm_i915_gem_object *obj)
-{
- if (!obj->mm.pages)
- return false;
-
- /* Consider only shrinkable ojects. */
- if (!i915_gem_object_is_shrinkable(obj))
- return false;
-
- /* Only report true if by unbinding the object and putting its pages
- * we can actually make forward progress towards freeing physical
- * pages.
- *
- * If the pages are pinned for any other reason than being bound
- * to the GPU, simply unbinding from the GPU is not going to succeed
- * in releasing our pin count on the pages themselves.
- */
- if (atomic_read(&obj->mm.pages_pin_count) > obj->bind_count)
- return false;
-
- if (any_vma_pinned(obj))
- return false;
-
- /* We can only return physical pages to the system if we can either
- * discard the contents (because the user has marked them as being
- * purgeable) or if we can move their contents out to swap.
- */
- return swap_available() || obj->mm.madv == I915_MADV_DONTNEED;
-}
-
-static bool unsafe_drop_pages(struct drm_i915_gem_object *obj)
-{
- if (i915_gem_object_unbind(obj) == 0)
- __i915_gem_object_put_pages(obj, I915_MM_SHRINKER);
- return !READ_ONCE(obj->mm.pages);
-}
-
-/**
- * i915_gem_shrink - Shrink buffer object caches
- * @dev_priv: i915 device
- * @target: amount of memory to make available, in pages
- * @flags: control flags for selecting cache types
- *
- * This function is the main interface to the shrinker. It will try to release
- * up to @target pages of main memory backing storage from buffer objects.
- * Selection of the specific caches can be done with @flags. This is e.g. useful
- * when purgeable objects should be removed from caches preferentially.
- *
- * Note that it's not guaranteed that released amount is actually available as
- * free system memory - the pages might still be in-used to due to other reasons
- * (like cpu mmaps) or the mm core has reused them before we could grab them.
- * Therefore code that needs to explicitly shrink buffer objects caches (e.g. to
- * avoid deadlocks in memory reclaim) must fall back to i915_gem_shrink_all().
- *
- * Also note that any kind of pinning (both per-vma address space pins and
- * backing storage pins at the buffer object level) result in the shrinker code
- * having to skip the object.
- *
- * Returns:
- * The number of pages of backing storage actually released.
- */
-unsigned long
-i915_gem_shrink(struct drm_i915_private *dev_priv,
- unsigned long target, unsigned flags)
-{
- const struct {
- struct list_head *list;
- unsigned int bit;
- } phases[] = {
- { &dev_priv->mm.unbound_list, I915_SHRINK_UNBOUND },
- { &dev_priv->mm.bound_list, I915_SHRINK_BOUND },
- { NULL, 0 },
- }, *phase;
- unsigned long count = 0;
- bool unlock;
-
- if (!shrinker_lock(dev_priv, &unlock))
- return 0;
-
- trace_i915_gem_shrink(dev_priv, target, flags);
- i915_gem_retire_requests(dev_priv);
-
- /*
- * Unbinding of objects will require HW access; Let us not wake the
- * device just to recover a little memory. If absolutely necessary,
- * we will force the wake during oom-notifier.
- */
- if ((flags & I915_SHRINK_BOUND) &&
- !intel_runtime_pm_get_if_in_use(dev_priv))
- flags &= ~I915_SHRINK_BOUND;
-
- /*
- * As we may completely rewrite the (un)bound list whilst unbinding
- * (due to retiring requests) we have to strictly process only
- * one element of the list at the time, and recheck the list
- * on every iteration.
- *
- * In particular, we must hold a reference whilst removing the
- * object as we may end up waiting for and/or retiring the objects.
- * This might release the final reference (held by the active list)
- * and result in the object being freed from under us. This is
- * similar to the precautions the eviction code must take whilst
- * removing objects.
- *
- * Also note that although these lists do not hold a reference to
- * the object we can safely grab one here: The final object
- * unreferencing and the bound_list are both protected by the
- * dev->struct_mutex and so we won't ever be able to observe an
- * object on the bound_list with a reference count equals 0.
- */
- for (phase = phases; phase->list; phase++) {
- struct list_head still_in_list;
- struct drm_i915_gem_object *obj;
-
- if ((flags & phase->bit) == 0)
- continue;
-
- INIT_LIST_HEAD(&still_in_list);
- while (count < target &&
- (obj = list_first_entry_or_null(phase->list,
- typeof(*obj),
- global_link))) {
- list_move_tail(&obj->global_link, &still_in_list);
- if (!obj->mm.pages) {
- list_del_init(&obj->global_link);
- continue;
- }
-
- if (flags & I915_SHRINK_PURGEABLE &&
- obj->mm.madv != I915_MADV_DONTNEED)
- continue;
-
- if (flags & I915_SHRINK_VMAPS &&
- !is_vmalloc_addr(obj->mm.mapping))
- continue;
-
- if (!(flags & I915_SHRINK_ACTIVE) &&
- (i915_gem_object_is_active(obj) ||
- i915_gem_object_is_framebuffer(obj)))
- continue;
-
- if (!can_release_pages(obj))
- continue;
-
- if (unsafe_drop_pages(obj)) {
- /* May arrive from get_pages on another bo */
- mutex_lock_nested(&obj->mm.lock,
- I915_MM_SHRINKER);
- if (!obj->mm.pages) {
- __i915_gem_object_invalidate(obj);
- list_del_init(&obj->global_link);
- count += obj->base.size >> PAGE_SHIFT;
- }
- mutex_unlock(&obj->mm.lock);
- }
- }
- list_splice_tail(&still_in_list, phase->list);
- }
-
- if (flags & I915_SHRINK_BOUND)
- intel_runtime_pm_put(dev_priv);
-
- i915_gem_retire_requests(dev_priv);
-
- shrinker_unlock(dev_priv, unlock);
-
- return count;
-}
-
-/**
- * i915_gem_shrink_all - Shrink buffer object caches completely
- * @dev_priv: i915 device
- *
- * This is a simple wraper around i915_gem_shrink() to aggressively shrink all
- * caches completely. It also first waits for and retires all outstanding
- * requests to also be able to release backing storage for active objects.
- *
- * This should only be used in code to intentionally quiescent the gpu or as a
- * last-ditch effort when memory seems to have run out.
- *
- * Returns:
- * The number of pages of backing storage actually released.
- */
-unsigned long i915_gem_shrink_all(struct drm_i915_private *dev_priv)
-{
- unsigned long freed;
-
- intel_runtime_pm_get(dev_priv);
- freed = i915_gem_shrink(dev_priv, -1UL,
- I915_SHRINK_BOUND |
- I915_SHRINK_UNBOUND |
- I915_SHRINK_ACTIVE);
- intel_runtime_pm_put(dev_priv);
-
- return freed;
-}
-
-static unsigned long
-i915_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
-{
- struct drm_i915_private *dev_priv =
- container_of(shrinker, struct drm_i915_private, mm.shrinker);
- struct drm_i915_gem_object *obj;
- unsigned long count;
- bool unlock;
-
- if (!shrinker_lock(dev_priv, &unlock))
- return 0;
-
- i915_gem_retire_requests(dev_priv);
-
- count = 0;
- list_for_each_entry(obj, &dev_priv->mm.unbound_list, global_link)
- if (can_release_pages(obj))
- count += obj->base.size >> PAGE_SHIFT;
-
- list_for_each_entry(obj, &dev_priv->mm.bound_list, global_link) {
- if (!i915_gem_object_is_active(obj) && can_release_pages(obj))
- count += obj->base.size >> PAGE_SHIFT;
- }
-
- shrinker_unlock(dev_priv, unlock);
-
- return count;
-}
-
-static unsigned long
-i915_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
-{
- struct drm_i915_private *dev_priv =
- container_of(shrinker, struct drm_i915_private, mm.shrinker);
- unsigned long freed;
- bool unlock;
-
- if (!shrinker_lock(dev_priv, &unlock))
- return SHRINK_STOP;
-
- freed = i915_gem_shrink(dev_priv,
- sc->nr_to_scan,
- I915_SHRINK_BOUND |
- I915_SHRINK_UNBOUND |
- I915_SHRINK_PURGEABLE);
- if (freed < sc->nr_to_scan)
- freed += i915_gem_shrink(dev_priv,
- sc->nr_to_scan - freed,
- I915_SHRINK_BOUND |
- I915_SHRINK_UNBOUND);
- if (freed < sc->nr_to_scan && current_is_kswapd()) {
- intel_runtime_pm_get(dev_priv);
- freed += i915_gem_shrink(dev_priv,
- sc->nr_to_scan - freed,
- I915_SHRINK_ACTIVE |
- I915_SHRINK_BOUND |
- I915_SHRINK_UNBOUND);
- intel_runtime_pm_put(dev_priv);
- }
-
- shrinker_unlock(dev_priv, unlock);
-
- return freed;
-}
-
-static bool
-shrinker_lock_uninterruptible(struct drm_i915_private *dev_priv, bool *unlock,
- int timeout_ms)
-{
- unsigned long timeout = jiffies + msecs_to_jiffies_timeout(timeout_ms);
-
- do {
- if (i915_gem_wait_for_idle(dev_priv, 0) == 0 &&
- shrinker_lock(dev_priv, unlock))
- break;
-
- schedule_timeout_killable(1);
- if (fatal_signal_pending(current))
- return false;
-
- if (time_after(jiffies, timeout)) {
- pr_err("Unable to lock GPU to purge memory.\n");
- return false;
- }
- } while (1);
-
- return true;
-}
-
-static int
-i915_gem_shrinker_oom(struct notifier_block *nb, unsigned long event, void *ptr)
-{
- struct drm_i915_private *dev_priv =
- container_of(nb, struct drm_i915_private, mm.oom_notifier);
- struct drm_i915_gem_object *obj;
- unsigned long unevictable, bound, unbound, freed_pages;
- bool unlock;
-
- if (!shrinker_lock_uninterruptible(dev_priv, &unlock, 5000))
- return NOTIFY_DONE;
-
- freed_pages = i915_gem_shrink_all(dev_priv);
-
- /* Because we may be allocating inside our own driver, we cannot
- * assert that there are no objects with pinned pages that are not
- * being pointed to by hardware.
- */
- unbound = bound = unevictable = 0;
- list_for_each_entry(obj, &dev_priv->mm.unbound_list, global_link) {
- if (!obj->mm.pages)
- continue;
-
- if (!can_release_pages(obj))
- unevictable += obj->base.size >> PAGE_SHIFT;
- else
- unbound += obj->base.size >> PAGE_SHIFT;
- }
- list_for_each_entry(obj, &dev_priv->mm.bound_list, global_link) {
- if (!obj->mm.pages)
- continue;
-
- if (!can_release_pages(obj))
- unevictable += obj->base.size >> PAGE_SHIFT;
- else
- bound += obj->base.size >> PAGE_SHIFT;
- }
-
- shrinker_unlock(dev_priv, unlock);
-
- if (freed_pages || unbound || bound)
- pr_info("Purging GPU memory, %lu pages freed, "
- "%lu pages still pinned.\n",
- freed_pages, unevictable);
- if (unbound || bound)
- pr_err("%lu and %lu pages still available in the "
- "bound and unbound GPU page lists.\n",
- bound, unbound);
-
- *(unsigned long *)ptr += freed_pages;
- return NOTIFY_DONE;
-}
-
-static int
-i915_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr)
-{
- struct drm_i915_private *dev_priv =
- container_of(nb, struct drm_i915_private, mm.vmap_notifier);
- struct i915_vma *vma, *next;
- unsigned long freed_pages = 0;
- bool unlock;
- int ret;
-
- if (!shrinker_lock_uninterruptible(dev_priv, &unlock, 5000))
- return NOTIFY_DONE;
-
- /* Force everything onto the inactive lists */
- ret = i915_gem_wait_for_idle(dev_priv, I915_WAIT_LOCKED);
- if (ret)
- goto out;
-
- intel_runtime_pm_get(dev_priv);
- freed_pages += i915_gem_shrink(dev_priv, -1UL,
- I915_SHRINK_BOUND |
- I915_SHRINK_UNBOUND |
- I915_SHRINK_ACTIVE |
- I915_SHRINK_VMAPS);
- intel_runtime_pm_put(dev_priv);
-
- /* We also want to clear any cached iomaps as they wrap vmap */
- list_for_each_entry_safe(vma, next,
- &dev_priv->ggtt.base.inactive_list, vm_link) {
- unsigned long count = vma->node.size >> PAGE_SHIFT;
- if (vma->iomap && i915_vma_unbind(vma) == 0)
- freed_pages += count;
- }
-
-out:
- shrinker_unlock(dev_priv, unlock);
-
- *(unsigned long *)ptr += freed_pages;
- return NOTIFY_DONE;
-}
-
-/**
- * i915_gem_shrinker_init - Initialize i915 shrinker
- * @dev_priv: i915 device
- *
- * This function registers and sets up the i915 shrinker and OOM handler.
- */
-void i915_gem_shrinker_init(struct drm_i915_private *dev_priv)
-{
- dev_priv->mm.shrinker.scan_objects = i915_gem_shrinker_scan;
- dev_priv->mm.shrinker.count_objects = i915_gem_shrinker_count;
- dev_priv->mm.shrinker.seeks = DEFAULT_SEEKS;
- WARN_ON(register_shrinker(&dev_priv->mm.shrinker));
-
- dev_priv->mm.oom_notifier.notifier_call = i915_gem_shrinker_oom;
- WARN_ON(register_oom_notifier(&dev_priv->mm.oom_notifier));
-
- dev_priv->mm.vmap_notifier.notifier_call = i915_gem_shrinker_vmap;
- WARN_ON(register_vmap_purge_notifier(&dev_priv->mm.vmap_notifier));
-}
-
-/**
- * i915_gem_shrinker_cleanup - Clean up i915 shrinker
- * @dev_priv: i915 device
- *
- * This function unregisters the i915 shrinker and OOM handler.
- */
-void i915_gem_shrinker_cleanup(struct drm_i915_private *dev_priv)
-{
- WARN_ON(unregister_vmap_purge_notifier(&dev_priv->mm.vmap_notifier));
- WARN_ON(unregister_oom_notifier(&dev_priv->mm.oom_notifier));
- unregister_shrinker(&dev_priv->mm.shrinker);
-}
generated by cgit (git 2.34.1) at 2025-12-25 15:55:05 +0000