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/*

 * 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 

 *    Chris Wilson 

 *

 */

#include 

#include 

#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

 * @size: size of the desired free space

 * @alignment: alignment constraint of the desired free space

 * @cache_level: cache_level for the desired space

 * @mappable: whether the free space must be mappable

 * @nonblocking: whether evicting active objects is allowed or not

 *

 * 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.

 *

 * 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, mm_list) {

		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, mm_list) {

		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;

}

/**

 * 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;

	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);

	}

	list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list)

		if (vma->pin_count == 0)

			WARN_ON(i915_vma_unbind(vma));

	return 0;

}

/**

 * i915_gem_evict_everything - Try to evict all objects

 * @dev: Device to evict objects for

 *

 * This functions tries to evict all gem objects from all address spaces. Used

 * by the shrinker as a last-ditch effort and for suspend, before releasing the

 * backing storage of all unbound objects.

 */

int

i915_gem_evict_everything(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct i915_address_space *vm, *v;

	bool lists_empty = true;

	int ret;

	list_for_each_entry(vm, &dev_priv->vm_list, global_link) {

		lists_empty = (list_empty(&vm->inactive_list) &&

			       list_empty(&vm->active_list));

		if (!lists_empty)

			lists_empty = false;

	}

	if (lists_empty)

		return -ENOSPC;

	trace_i915_gem_evict_everything(dev);

	/* The gpu_idle will flush everything in the write domain to the

	 * active list. Then we must move everything off the active list

	 * with retire requests.

	 */

	ret = i915_gpu_idle(dev);

	if (ret)

		return ret;

	i915_gem_retire_requests(dev);

	/* Having flushed everything, unbind() should never raise an error */

	list_for_each_entry_safe(vm, v, &dev_priv->vm_list, global_link)

		WARN_ON(i915_gem_evict_vm(vm, false));

	return 0;

}