drm/i915: Move more GEM objects under gem/

Continuing the theme of separating out the GEM clutter.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528092956.14910-8-chris@chris-wilson.co.uk

1 files changed, 0 insertions, 574 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 2c7aefb3e101..000000000000
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ /dev/null
@@ -1,574 +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/sched/mm.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/i915_drm.h>
-
-#include "i915_drv.h"
-#include "i915_trace.h"
-
-static bool shrinker_lock(struct drm_i915_private *i915,
-			  unsigned int flags,
-			  bool *unlock)
-{
-	struct mutex *m = &i915->drm.struct_mutex;
-
-	switch (mutex_trylock_recursive(m)) {
-	case MUTEX_TRYLOCK_RECURSIVE:
-		*unlock = false;
-		return true;
-
-	case MUTEX_TRYLOCK_FAILED:
-		*unlock = false;
-		if (flags & I915_SHRINK_ACTIVE &&
-		    mutex_lock_killable_nested(m, I915_MM_SHRINKER) == 0)
-			*unlock = true;
-		return *unlock;
-
-	case MUTEX_TRYLOCK_SUCCESS:
-		*unlock = true;
-		return true;
-	}
-
-	BUG();
-}
-
-static void shrinker_unlock(struct drm_i915_private *i915, bool unlock)
-{
-	if (!unlock)
-		return;
-
-	mutex_unlock(&i915->drm.struct_mutex);
-}
-
-static bool swap_available(void)
-{
-	return get_nr_swap_pages() > 0;
-}
-
-static bool can_release_pages(struct drm_i915_gem_object *obj)
-{
-	/* 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 are "permanently" pinned, it will prevent us from
-	 * reclaiming the obj->mm.pages. We only allow scanout objects to claim
-	 * a permanent pin, along with a few others like the context objects.
-	 * To simplify the scan, and to avoid walking the list of vma under the
-	 * object, we just check the count of its permanently pinned.
-	 */
-	if (READ_ONCE(obj->pin_global))
-		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 !i915_gem_object_has_pages(obj);
-}
-
-static void try_to_writeback(struct drm_i915_gem_object *obj,
-			     unsigned int flags)
-{
-	switch (obj->mm.madv) {
-	case I915_MADV_DONTNEED:
-		i915_gem_object_truncate(obj);
-	case __I915_MADV_PURGED:
-		return;
-	}
-
-	if (flags & I915_SHRINK_WRITEBACK)
-		i915_gem_object_writeback(obj);
-}
-
-/**
- * i915_gem_shrink - Shrink buffer object caches
- * @i915: i915 device
- * @target: amount of memory to make available, in pages
- * @nr_scanned: optional output for number of pages scanned (incremental)
- * @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 *i915,
-		unsigned long target,
-		unsigned long *nr_scanned,
-		unsigned flags)
-{
-	const struct {
-		struct list_head *list;
-		unsigned int bit;
-	} phases[] = {
-		{ &i915->mm.unbound_list, I915_SHRINK_UNBOUND },
-		{ &i915->mm.bound_list, I915_SHRINK_BOUND },
-		{ NULL, 0 },
-	}, *phase;
-	intel_wakeref_t wakeref = 0;
-	unsigned long count = 0;
-	unsigned long scanned = 0;
-	bool unlock;
-
-	if (!shrinker_lock(i915, flags, &unlock))
-		return 0;
-
-	/*
-	 * When shrinking the active list, also consider active contexts.
-	 * Active contexts are pinned until they are retired, and so can
-	 * not be simply unbound to retire and unpin their pages. To shrink
-	 * the contexts, we must wait until the gpu is idle.
-	 *
-	 * We don't care about errors here; if we cannot wait upon the GPU,
-	 * we will free as much as we can and hope to get a second chance.
-	 */
-	if (flags & I915_SHRINK_ACTIVE)
-		i915_gem_wait_for_idle(i915,
-				       I915_WAIT_LOCKED,
-				       MAX_SCHEDULE_TIMEOUT);
-
-	trace_i915_gem_shrink(i915, target, flags);
-	i915_retire_requests(i915);
-
-	/*
-	 * 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) {
-		wakeref = intel_runtime_pm_get_if_in_use(i915);
-		if (!wakeref)
-			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);
-
-		/*
-		 * We serialize our access to unreferenced objects through
-		 * the use of the struct_mutex. While the objects are not
-		 * yet freed (due to RCU then a workqueue) we still want
-		 * to be able to shrink their pages, so they remain on
-		 * the unbound/bound list until actually freed.
-		 */
-		spin_lock(&i915->mm.obj_lock);
-		while (count < target &&
-		       (obj = list_first_entry_or_null(phase->list,
-						       typeof(*obj),
-						       mm.link))) {
-			list_move_tail(&obj->mm.link, &still_in_list);
-
-			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;
-
-			spin_unlock(&i915->mm.obj_lock);
-
-			if (unsafe_drop_pages(obj)) {
-				/* May arrive from get_pages on another bo */
-				mutex_lock_nested(&obj->mm.lock,
-						  I915_MM_SHRINKER);
-				if (!i915_gem_object_has_pages(obj)) {
-					try_to_writeback(obj, flags);
-					count += obj->base.size >> PAGE_SHIFT;
-				}
-				mutex_unlock(&obj->mm.lock);
-			}
-			scanned += obj->base.size >> PAGE_SHIFT;
-
-			spin_lock(&i915->mm.obj_lock);
-		}
-		list_splice_tail(&still_in_list, phase->list);
-		spin_unlock(&i915->mm.obj_lock);
-	}
-
-	if (flags & I915_SHRINK_BOUND)
-		intel_runtime_pm_put(i915, wakeref);
-
-	i915_retire_requests(i915);
-
-	shrinker_unlock(i915, unlock);
-
-	if (nr_scanned)
-		*nr_scanned += scanned;
-	return count;
-}
-
-/**
- * i915_gem_shrink_all - Shrink buffer object caches completely
- * @i915: 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 *i915)
-{
-	intel_wakeref_t wakeref;
-	unsigned long freed = 0;
-
-	with_intel_runtime_pm(i915, wakeref) {
-		freed = i915_gem_shrink(i915, -1UL, NULL,
-					I915_SHRINK_BOUND |
-					I915_SHRINK_UNBOUND |
-					I915_SHRINK_ACTIVE);
-	}
-
-	return freed;
-}
-
-static unsigned long
-i915_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
-{
-	struct drm_i915_private *i915 =
-		container_of(shrinker, struct drm_i915_private, mm.shrinker);
-	struct drm_i915_gem_object *obj;
-	unsigned long num_objects = 0;
-	unsigned long count = 0;
-
-	spin_lock(&i915->mm.obj_lock);
-	list_for_each_entry(obj, &i915->mm.unbound_list, mm.link)
-		if (can_release_pages(obj)) {
-			count += obj->base.size >> PAGE_SHIFT;
-			num_objects++;
-		}
-
-	list_for_each_entry(obj, &i915->mm.bound_list, mm.link)
-		if (!i915_gem_object_is_active(obj) && can_release_pages(obj)) {
-			count += obj->base.size >> PAGE_SHIFT;
-			num_objects++;
-		}
-	spin_unlock(&i915->mm.obj_lock);
-
-	/* Update our preferred vmscan batch size for the next pass.
-	 * Our rough guess for an effective batch size is roughly 2
-	 * available GEM objects worth of pages. That is we don't want
-	 * the shrinker to fire, until it is worth the cost of freeing an
-	 * entire GEM object.
-	 */
-	if (num_objects) {
-		unsigned long avg = 2 * count / num_objects;
-
-		i915->mm.shrinker.batch =
-			max((i915->mm.shrinker.batch + avg) >> 1,
-			    128ul /* default SHRINK_BATCH */);
-	}
-
-	return count;
-}
-
-static unsigned long
-i915_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
-{
-	struct drm_i915_private *i915 =
-		container_of(shrinker, struct drm_i915_private, mm.shrinker);
-	unsigned long freed;
-	bool unlock;
-
-	sc->nr_scanned = 0;
-
-	if (!shrinker_lock(i915, 0, &unlock))
-		return SHRINK_STOP;
-
-	freed = i915_gem_shrink(i915,
-				sc->nr_to_scan,
-				&sc->nr_scanned,
-				I915_SHRINK_BOUND |
-				I915_SHRINK_UNBOUND |
-				I915_SHRINK_PURGEABLE |
-				I915_SHRINK_WRITEBACK);
-	if (sc->nr_scanned < sc->nr_to_scan)
-		freed += i915_gem_shrink(i915,
-					 sc->nr_to_scan - sc->nr_scanned,
-					 &sc->nr_scanned,
-					 I915_SHRINK_BOUND |
-					 I915_SHRINK_UNBOUND |
-					 I915_SHRINK_WRITEBACK);
-	if (sc->nr_scanned < sc->nr_to_scan && current_is_kswapd()) {
-		intel_wakeref_t wakeref;
-
-		with_intel_runtime_pm(i915, wakeref) {
-			freed += i915_gem_shrink(i915,
-						 sc->nr_to_scan - sc->nr_scanned,
-						 &sc->nr_scanned,
-						 I915_SHRINK_ACTIVE |
-						 I915_SHRINK_BOUND |
-						 I915_SHRINK_UNBOUND |
-						 I915_SHRINK_WRITEBACK);
-		}
-	}
-
-	shrinker_unlock(i915, unlock);
-
-	return sc->nr_scanned ? freed : SHRINK_STOP;
-}
-
-static int
-i915_gem_shrinker_oom(struct notifier_block *nb, unsigned long event, void *ptr)
-{
-	struct drm_i915_private *i915 =
-		container_of(nb, struct drm_i915_private, mm.oom_notifier);
-	struct drm_i915_gem_object *obj;
-	unsigned long unevictable, bound, unbound, freed_pages;
-	intel_wakeref_t wakeref;
-
-	freed_pages = 0;
-	with_intel_runtime_pm(i915, wakeref)
-		freed_pages += i915_gem_shrink(i915, -1UL, NULL,
-					       I915_SHRINK_BOUND |
-					       I915_SHRINK_UNBOUND |
-					       I915_SHRINK_WRITEBACK);
-
-	/* 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;
-	spin_lock(&i915->mm.obj_lock);
-	list_for_each_entry(obj, &i915->mm.unbound_list, mm.link) {
-		if (!can_release_pages(obj))
-			unevictable += obj->base.size >> PAGE_SHIFT;
-		else
-			unbound += obj->base.size >> PAGE_SHIFT;
-	}
-	list_for_each_entry(obj, &i915->mm.bound_list, mm.link) {
-		if (!can_release_pages(obj))
-			unevictable += obj->base.size >> PAGE_SHIFT;
-		else
-			bound += obj->base.size >> PAGE_SHIFT;
-	}
-	spin_unlock(&i915->mm.obj_lock);
-
-	if (freed_pages || unbound || bound)
-		pr_info("Purging GPU memory, %lu pages freed, "
-			"%lu pages still pinned.\n",
-			freed_pages, unevictable);
-
-	*(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 *i915 =
-		container_of(nb, struct drm_i915_private, mm.vmap_notifier);
-	struct i915_vma *vma, *next;
-	unsigned long freed_pages = 0;
-	intel_wakeref_t wakeref;
-	bool unlock;
-
-	if (!shrinker_lock(i915, 0, &unlock))
-		return NOTIFY_DONE;
-
-	/* Force everything onto the inactive lists */
-	if (i915_gem_wait_for_idle(i915,
-				   I915_WAIT_LOCKED,
-				   MAX_SCHEDULE_TIMEOUT))
-		goto out;
-
-	with_intel_runtime_pm(i915, wakeref)
-		freed_pages += i915_gem_shrink(i915, -1UL, NULL,
-					       I915_SHRINK_BOUND |
-					       I915_SHRINK_UNBOUND |
-					       I915_SHRINK_VMAPS);
-
-	/* We also want to clear any cached iomaps as they wrap vmap */
-	mutex_lock(&i915->ggtt.vm.mutex);
-	list_for_each_entry_safe(vma, next,
-				 &i915->ggtt.vm.bound_list, vm_link) {
-		unsigned long count = vma->node.size >> PAGE_SHIFT;
-
-		if (!vma->iomap || i915_vma_is_active(vma))
-			continue;
-
-		mutex_unlock(&i915->ggtt.vm.mutex);
-		if (i915_vma_unbind(vma) == 0)
-			freed_pages += count;
-		mutex_lock(&i915->ggtt.vm.mutex);
-	}
-	mutex_unlock(&i915->ggtt.vm.mutex);
-
-out:
-	shrinker_unlock(i915, unlock);
-
-	*(unsigned long *)ptr += freed_pages;
-	return NOTIFY_DONE;
-}
-
-/**
- * i915_gem_shrinker_register - Register the i915 shrinker
- * @i915: i915 device
- *
- * This function registers and sets up the i915 shrinker and OOM handler.
- */
-void i915_gem_shrinker_register(struct drm_i915_private *i915)
-{
-	i915->mm.shrinker.scan_objects = i915_gem_shrinker_scan;
-	i915->mm.shrinker.count_objects = i915_gem_shrinker_count;
-	i915->mm.shrinker.seeks = DEFAULT_SEEKS;
-	i915->mm.shrinker.batch = 4096;
-	WARN_ON(register_shrinker(&i915->mm.shrinker));
-
-	i915->mm.oom_notifier.notifier_call = i915_gem_shrinker_oom;
-	WARN_ON(register_oom_notifier(&i915->mm.oom_notifier));
-
-	i915->mm.vmap_notifier.notifier_call = i915_gem_shrinker_vmap;
-	WARN_ON(register_vmap_purge_notifier(&i915->mm.vmap_notifier));
-}
-
-/**
- * i915_gem_shrinker_unregister - Unregisters the i915 shrinker
- * @i915: i915 device
- *
- * This function unregisters the i915 shrinker and OOM handler.
- */
-void i915_gem_shrinker_unregister(struct drm_i915_private *i915)
-{
-	WARN_ON(unregister_vmap_purge_notifier(&i915->mm.vmap_notifier));
-	WARN_ON(unregister_oom_notifier(&i915->mm.oom_notifier));
-	unregister_shrinker(&i915->mm.shrinker);
-}
-
-void i915_gem_shrinker_taints_mutex(struct drm_i915_private *i915,
-				    struct mutex *mutex)
-{
-	bool unlock = false;
-
-	if (!IS_ENABLED(CONFIG_LOCKDEP))
-		return;
-
-	if (!lockdep_is_held_type(&i915->drm.struct_mutex, -1)) {
-		mutex_acquire(&i915->drm.struct_mutex.dep_map,
-			      I915_MM_NORMAL, 0, _RET_IP_);
-		unlock = true;
-	}
-
-	fs_reclaim_acquire(GFP_KERNEL);
-
-	/*
-	 * As we invariably rely on the struct_mutex within the shrinker,
-	 * but have a complicated recursion dance, taint all the mutexes used
-	 * within the shrinker with the struct_mutex. For completeness, we
-	 * taint with all subclass of struct_mutex, even though we should
-	 * only need tainting by I915_MM_NORMAL to catch possible ABBA
-	 * deadlocks from using struct_mutex inside @mutex.
-	 */
-	mutex_acquire(&i915->drm.struct_mutex.dep_map,
-		      I915_MM_SHRINKER, 0, _RET_IP_);
-
-	mutex_acquire(&mutex->dep_map, 0, 0, _RET_IP_);
-	mutex_release(&mutex->dep_map, 0, _RET_IP_);
-
-	mutex_release(&i915->drm.struct_mutex.dep_map, 0, _RET_IP_);
-
-	fs_reclaim_release(GFP_KERNEL);
-
-	if (unlock)
-		mutex_release(&i915->drm.struct_mutex.dep_map, 0, _RET_IP_);
-}