drivers/gpu/drm/i915/i915_gem_evict.c - kernel/quantenna - Git at Google

 /*
  * Copyright © 2008-2010 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.
  *
  * Authors:
  *    Eric Anholt <eric@anholt.net>
  *    Chris Wilson <chris@chris-wilson.co.uuk>
  *
  */

 #include <drm/drmP.h>
 #include <drm/i915_drm.h>

 #include "i915_drv.h"
 #include "intel_drv.h"
 #include "i915_trace.h"

 static bool
 mark_free(struct i915_vma *vma, struct list_head *unwind)
 {
 	if (vma->pin_count)
 		return false;

 	if (WARN_ON(!list_empty(&vma->exec_list)))
 		return false;

 	list_add(&vma->exec_list, unwind);
 	return drm_mm_scan_add_block(&vma->node);
 }

 /**
  * i915_gem_evict_something - Evict vmas to make room for binding a new one
  * @dev: drm_device
  * @vm: address space to evict from
  * @min_size: size of the desired free space
  * @alignment: alignment constraint of the desired free space
  * @cache_level: cache_level for the desired space
  * @start: start (inclusive) of the range from which to evict objects
  * @end: end (exclusive) of the range from which to evict objects
  * @flags: additional flags to control the eviction algorithm
  *
  * This function will try to evict vmas until a free space satisfying the
  * requirements is found. Callers must check first whether any such hole exists
  * already before calling this function.
  *
  * This function is used by the object/vma binding code.
  *
  * Since this function is only used to free up virtual address space it only
  * ignores pinned vmas, and not object where the backing storage itself is
  * pinned. Hence obj->pages_pin_count does not protect against eviction.
  *
  * To clarify: This is for freeing up virtual address space, not for freeing
  * memory in e.g. the shrinker.
  */
 int
 i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm,
 			 int min_size, unsigned alignment, unsigned cache_level,
 			 unsigned long start, unsigned long end,
 			 unsigned flags)
 {
 	struct list_head eviction_list, unwind_list;
 	struct i915_vma *vma;
 	int ret = 0;
 	int pass = 0;

 	trace_i915_gem_evict(dev, min_size, alignment, flags);

 	/*
 	 * The goal is to evict objects and amalgamate space in LRU order.
 	 * The oldest idle objects reside on the inactive list, which is in
 	 * retirement order. The next objects to retire are those on the (per
 	 * ring) active list that do not have an outstanding flush. Once the
 	 * hardware reports completion (the seqno is updated after the
 	 * batchbuffer has been finished) the clean buffer objects would
 	 * be retired to the inactive list. Any dirty objects would be added
 	 * to the tail of the flushing list. So after processing the clean
 	 * active objects we need to emit a MI_FLUSH to retire the flushing
 	 * list, hence the retirement order of the flushing list is in
 	 * advance of the dirty objects on the active lists.
 	 *
 	 * The retirement sequence is thus:
 	 *   1. Inactive objects (already retired)
 	 *   2. Clean active objects
 	 *   3. Flushing list
 	 *   4. Dirty active objects.
 	 *
 	 * On each list, the oldest objects lie at the HEAD with the freshest
 	 * object on the TAIL.
 	 */

 	INIT_LIST_HEAD(&unwind_list);
 	if (start != 0 || end != vm->total) {
 		drm_mm_init_scan_with_range(&vm->mm, min_size,
 					    alignment, cache_level,
 					    start, end);
 	} else
 		drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);

 search_again:
 	/* First see if there is a large enough contiguous idle region... */
 	list_for_each_entry(vma, &vm->inactive_list, vm_link) {
 		if (mark_free(vma, &unwind_list))
 			goto found;
 	}

 	if (flags & PIN_NONBLOCK)
 		goto none;

 	/* Now merge in the soon-to-be-expired objects... */
 	list_for_each_entry(vma, &vm->active_list, vm_link) {
 		if (mark_free(vma, &unwind_list))
 			goto found;
 	}

 none:
 	/* Nothing found, clean up and bail out! */
 	while (!list_empty(&unwind_list)) {
 		vma = list_first_entry(&unwind_list,
 				       struct i915_vma,
 				       exec_list);
 		ret = drm_mm_scan_remove_block(&vma->node);
 		BUG_ON(ret);

 		list_del_init(&vma->exec_list);
 	}

 	/* Can we unpin some objects such as idle hw contents,
 	 * or pending flips?
 	 */
 	if (flags & PIN_NONBLOCK)
 		return -ENOSPC;

 	/* Only idle the GPU and repeat the search once */
 	if (pass++ == 0) {
 		ret = i915_gpu_idle(dev);
 		if (ret)
 			return ret;

 		i915_gem_retire_requests(dev);
 		goto search_again;
 	}

 	/* If we still have pending pageflip completions, drop
 	 * back to userspace to give our workqueues time to
 	 * acquire our locks and unpin the old scanouts.
 	 */
 	return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC;

 found:
 	/* drm_mm doesn't allow any other other operations while
 	 * scanning, therefore store to be evicted objects on a
 	 * temporary list. */
 	INIT_LIST_HEAD(&eviction_list);
 	while (!list_empty(&unwind_list)) {
 		vma = list_first_entry(&unwind_list,
 				       struct i915_vma,
 				       exec_list);
 		if (drm_mm_scan_remove_block(&vma->node)) {
 			list_move(&vma->exec_list, &eviction_list);
 			drm_gem_object_reference(&vma->obj->base);
 			continue;
 		}
 		list_del_init(&vma->exec_list);
 	}

 	/* Unbinding will emit any required flushes */
 	while (!list_empty(&eviction_list)) {
 		struct drm_gem_object *obj;
 		vma = list_first_entry(&eviction_list,
 				       struct i915_vma,
 				       exec_list);

 		obj =  &vma->obj->base;
 		list_del_init(&vma->exec_list);
 		if (ret == 0)
 			ret = i915_vma_unbind(vma);

 		drm_gem_object_unreference(obj);
 	}

 	return ret;
 }

 int
 i915_gem_evict_for_vma(struct i915_vma *target)
 {
 	struct drm_mm_node *node, *next;

 	list_for_each_entry_safe(node, next,
 			&target->vm->mm.head_node.node_list,
 			node_list) {
 		struct i915_vma *vma;
 		int ret;

 		if (node->start + node->size <= target->node.start)
 			continue;
 		if (node->start >= target->node.start + target->node.size)
 			break;

 		vma = container_of(node, typeof(*vma), node);

 		if (vma->pin_count) {
 			if (!vma->exec_entry || (vma->pin_count > 1))
 				/* Object is pinned for some other use */
 				return -EBUSY;

 			/* We need to evict a buffer in the same batch */
 			if (vma->exec_entry->flags & EXEC_OBJECT_PINNED)
 				/* Overlapping fixed objects in the same batch */
 				return -EINVAL;

 			return -ENOSPC;
 		}

 		ret = i915_vma_unbind(vma);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 /**
  * i915_gem_evict_vm - Evict all idle vmas from a vm
  * @vm: Address space to cleanse
  * @do_idle: Boolean directing whether to idle first.
  *
  * This function evicts all idles vmas from a vm. If all unpinned vmas should be
  * evicted the @do_idle needs to be set to true.
  *
  * This is used by the execbuf code as a last-ditch effort to defragment the
  * address space.
  *
  * To clarify: This is for freeing up virtual address space, not for freeing
  * memory in e.g. the shrinker.
  */
 int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
 {
 	struct i915_vma *vma, *next;
 	int ret;

 	WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex));
 	trace_i915_gem_evict_vm(vm);

 	if (do_idle) {
 		ret = i915_gpu_idle(vm->dev);
 		if (ret)
 			return ret;

 		i915_gem_retire_requests(vm->dev);

 		WARN_ON(!list_empty(&vm->active_list));
 	}

 	list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link)
 		if (vma->pin_count == 0)
 			WARN_ON(i915_vma_unbind(vma));

 	return 0;
 }
	/*
	* Copyright © 2008-2010 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.
	*
	* Authors:
	* Eric Anholt <eric@anholt.net>
	* Chris Wilson <chris@chris-wilson.co.uuk>
	*
	*/

	#include <drm/drmP.h>
	#include <drm/i915_drm.h>

	#include "i915_drv.h"
	#include "intel_drv.h"
	#include "i915_trace.h"

	static bool
	mark_free(struct i915_vma vma, struct list_head unwind)
	{
	if (vma->pin_count)
	return false;

	if (WARN_ON(!list_empty(&vma->exec_list)))
	return false;

	list_add(&vma->exec_list, unwind);
	return drm_mm_scan_add_block(&vma->node);
	}

	/**
	* i915_gem_evict_something - Evict vmas to make room for binding a new one
	* @dev: drm_device
	* @vm: address space to evict from
	* @min_size: size of the desired free space
	* @alignment: alignment constraint of the desired free space
	* @cache_level: cache_level for the desired space
	* @start: start (inclusive) of the range from which to evict objects
	* @end: end (exclusive) of the range from which to evict objects
	* @flags: additional flags to control the eviction algorithm
	*
	* This function will try to evict vmas until a free space satisfying the
	* requirements is found. Callers must check first whether any such hole exists
	* already before calling this function.
	*
	* This function is used by the object/vma binding code.
	*
	* Since this function is only used to free up virtual address space it only
	* ignores pinned vmas, and not object where the backing storage itself is
	* pinned. Hence obj->pages_pin_count does not protect against eviction.
	*
	* To clarify: This is for freeing up virtual address space, not for freeing
	* memory in e.g. the shrinker.
	*/
	int
	i915_gem_evict_something(struct drm_device dev, struct i915_address_space vm,
	int min_size, unsigned alignment, unsigned cache_level,
	unsigned long start, unsigned long end,
	unsigned flags)
	{
	struct list_head eviction_list, unwind_list;
	struct i915_vma *vma;
	int ret = 0;
	int pass = 0;

	trace_i915_gem_evict(dev, min_size, alignment, flags);

	/*
	* The goal is to evict objects and amalgamate space in LRU order.
	* The oldest idle objects reside on the inactive list, which is in
	* retirement order. The next objects to retire are those on the (per
	* ring) active list that do not have an outstanding flush. Once the
	* hardware reports completion (the seqno is updated after the
	* batchbuffer has been finished) the clean buffer objects would
	* be retired to the inactive list. Any dirty objects would be added
	* to the tail of the flushing list. So after processing the clean
	* active objects we need to emit a MI_FLUSH to retire the flushing
	* list, hence the retirement order of the flushing list is in
	* advance of the dirty objects on the active lists.
	*
	* The retirement sequence is thus:
	* 1. Inactive objects (already retired)
	* 2. Clean active objects
	* 3. Flushing list
	* 4. Dirty active objects.
	*
	* On each list, the oldest objects lie at the HEAD with the freshest
	* object on the TAIL.
	*/

	INIT_LIST_HEAD(&unwind_list);
	if (start != 0 \|\| end != vm->total) {
	drm_mm_init_scan_with_range(&vm->mm, min_size,
	alignment, cache_level,
	start, end);
	} else
	drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);

	search_again:
	/* First see if there is a large enough contiguous idle region... */
	list_for_each_entry(vma, &vm->inactive_list, vm_link) {
	if (mark_free(vma, &unwind_list))
	goto found;
	}

	if (flags & PIN_NONBLOCK)
	goto none;

	/* Now merge in the soon-to-be-expired objects... */
	list_for_each_entry(vma, &vm->active_list, vm_link) {
	if (mark_free(vma, &unwind_list))
	goto found;
	}

	none:
	/* Nothing found, clean up and bail out! */
	while (!list_empty(&unwind_list)) {
	vma = list_first_entry(&unwind_list,
	struct i915_vma,
	exec_list);
	ret = drm_mm_scan_remove_block(&vma->node);
	BUG_ON(ret);

	list_del_init(&vma->exec_list);
	}

	/* Can we unpin some objects such as idle hw contents,
	* or pending flips?
	*/
	if (flags & PIN_NONBLOCK)
	return -ENOSPC;

	/* Only idle the GPU and repeat the search once */
	if (pass++ == 0) {
	ret = i915_gpu_idle(dev);
	if (ret)
	return ret;

	i915_gem_retire_requests(dev);
	goto search_again;
	}

	/* If we still have pending pageflip completions, drop
	* back to userspace to give our workqueues time to
	* acquire our locks and unpin the old scanouts.
	*/
	return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC;

	found:
	/* drm_mm doesn't allow any other other operations while
	* scanning, therefore store to be evicted objects on a
	* temporary list. */
	INIT_LIST_HEAD(&eviction_list);
	while (!list_empty(&unwind_list)) {
	vma = list_first_entry(&unwind_list,
	struct i915_vma,
	exec_list);
	if (drm_mm_scan_remove_block(&vma->node)) {
	list_move(&vma->exec_list, &eviction_list);
	drm_gem_object_reference(&vma->obj->base);
	continue;
	}
	list_del_init(&vma->exec_list);
	}

	/* Unbinding will emit any required flushes */
	while (!list_empty(&eviction_list)) {
	struct drm_gem_object *obj;
	vma = list_first_entry(&eviction_list,
	struct i915_vma,
	exec_list);

	obj = &vma->obj->base;
	list_del_init(&vma->exec_list);
	if (ret == 0)
	ret = i915_vma_unbind(vma);

	drm_gem_object_unreference(obj);
	}

	return ret;
	}

	int
	i915_gem_evict_for_vma(struct i915_vma *target)
	{
	struct drm_mm_node node, next;

	list_for_each_entry_safe(node, next,
	&target->vm->mm.head_node.node_list,
	node_list) {
	struct i915_vma *vma;
	int ret;

	if (node->start + node->size <= target->node.start)
	continue;
	if (node->start >= target->node.start + target->node.size)
	break;

	vma = container_of(node, typeof(*vma), node);

	if (vma->pin_count) {
	if (!vma->exec_entry \|\| (vma->pin_count > 1))
	/* Object is pinned for some other use */
	return -EBUSY;

	/* We need to evict a buffer in the same batch */
	if (vma->exec_entry->flags & EXEC_OBJECT_PINNED)
	/* Overlapping fixed objects in the same batch */
	return -EINVAL;

	return -ENOSPC;
	}

	ret = i915_vma_unbind(vma);
	if (ret)
	return ret;
	}

	return 0;
	}

	/**
	* i915_gem_evict_vm - Evict all idle vmas from a vm
	* @vm: Address space to cleanse
	* @do_idle: Boolean directing whether to idle first.
	*
	* This function evicts all idles vmas from a vm. If all unpinned vmas should be
	* evicted the @do_idle needs to be set to true.
	*
	* This is used by the execbuf code as a last-ditch effort to defragment the
	* address space.
	*
	* To clarify: This is for freeing up virtual address space, not for freeing
	* memory in e.g. the shrinker.
	*/
	int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
	{
	struct i915_vma vma, next;
	int ret;

	WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex));
	trace_i915_gem_evict_vm(vm);

	if (do_idle) {
	ret = i915_gpu_idle(vm->dev);
	if (ret)
	return ret;

	i915_gem_retire_requests(vm->dev);

	WARN_ON(!list_empty(&vm->active_list));
	}

	list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link)
	if (vma->pin_count == 0)
	WARN_ON(i915_vma_unbind(vma));

	return 0;
	}