drivers/gpu/drm/i915/i915_gem_evict.c - linux-imx - 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
 gpu_is_idle(struct drm_i915_private *dev_priv)
 {
 	struct intel_engine_cs *engine;

 	for_each_engine(engine, dev_priv) {
 		if (intel_engine_is_active(engine))
 			return false;
 	}

 	return true;
 }

 static bool
 mark_free(struct i915_vma *vma, unsigned int flags, struct list_head *unwind)
 {
 	if (i915_vma_is_pinned(vma))
 		return false;

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

 	if (flags & PIN_NONFAULT && vma->obj->fault_mappable)
 		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
  * @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 i915_address_space *vm,
 			 u64 min_size, u64 alignment,
 			 unsigned cache_level,
 			 u64 start, u64 end,
 			 unsigned flags)
 {
 	struct drm_i915_private *dev_priv = to_i915(vm->dev);
 	struct list_head eviction_list;
 	struct list_head *phases[] = {
 		&vm->inactive_list,
 		&vm->active_list,
 		NULL,
 	}, **phase;
 	struct i915_vma *vma, *next;
 	int ret;

 	trace_i915_gem_evict(vm, 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 in flight,
 	 * on the active list, again in retirement order.
 	 *
 	 * The retirement sequence is thus:
 	 *   1. Inactive objects (already retired)
 	 *   2. Active objects (will stall on unbinding)
 	 *
 	 * On each list, the oldest objects lie at the HEAD with the freshest
 	 * object on the TAIL.
 	 */
 	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);

 	if (flags & PIN_NONBLOCK)
 		phases[1] = NULL;

 search_again:
 	INIT_LIST_HEAD(&eviction_list);
 	phase = phases;
 	do {
 		list_for_each_entry(vma, *phase, vm_link)
 			if (mark_free(vma, flags, &eviction_list))
 				goto found;
 	} while (*++phase);

 	/* Nothing found, clean up and bail out! */
 	list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
 		ret = drm_mm_scan_remove_block(&vma->node);
 		BUG_ON(ret);

 		INIT_LIST_HEAD(&vma->exec_list);
 	}

 	/* Can we unpin some objects such as idle hw contents,
 	 * or pending flips? But since only the GGTT has global entries
 	 * such as scanouts, rinbuffers and contexts, we can skip the
 	 * purge when inspecting per-process local address spaces.
 	 */
 	if (!i915_is_ggtt(vm) || flags & PIN_NONBLOCK)
 		return -ENOSPC;

 	if (gpu_is_idle(dev_priv)) {
 		/* 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(vm->dev) ? -EAGAIN : -ENOSPC;
 	}

 	/* Not everything in the GGTT is tracked via vma (otherwise we
 	 * could evict as required with minimal stalling) so we are forced
 	 * to idle the GPU and explicitly retire outstanding requests in
 	 * the hopes that we can then remove contexts and the like only
 	 * bound by their active reference.
 	 */
 	ret = i915_gem_switch_to_kernel_context(dev_priv);
 	if (ret)
 		return ret;

 	ret = i915_gem_wait_for_idle(dev_priv,
 				     I915_WAIT_INTERRUPTIBLE |
 				     I915_WAIT_LOCKED);
 	if (ret)
 		return ret;

 	i915_gem_retire_requests(dev_priv);
 	goto search_again;

 found:
 	/* drm_mm doesn't allow any other other operations while
 	 * scanning, therefore store to-be-evicted objects on a
 	 * temporary list and take a reference for all before
 	 * calling unbind (which may remove the active reference
 	 * of any of our objects, thus corrupting the list).
 	 */
 	list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
 		if (drm_mm_scan_remove_block(&vma->node))
 			__i915_vma_pin(vma);
 		else
 			list_del_init(&vma->exec_list);
 	}

 	/* Unbinding will emit any required flushes */
 	ret = 0;
 	while (!list_empty(&eviction_list)) {
 		vma = list_first_entry(&eviction_list,
 				       struct i915_vma,
 				       exec_list);

 		list_del_init(&vma->exec_list);
 		__i915_vma_unpin(vma);
 		if (ret == 0)
 			ret = i915_vma_unbind(vma);
 	}
 	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 (i915_vma_is_pinned(vma)) {
 			if (!vma->exec_entry || i915_vma_pin_count(vma) > 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) {
 		struct drm_i915_private *dev_priv = to_i915(vm->dev);

 		if (i915_is_ggtt(vm)) {
 			ret = i915_gem_switch_to_kernel_context(dev_priv);
 			if (ret)
 				return ret;
 		}

 		ret = i915_gem_wait_for_idle(dev_priv,
 					     I915_WAIT_INTERRUPTIBLE |
 					     I915_WAIT_LOCKED);
 		if (ret)
 			return ret;

 		i915_gem_retire_requests(dev_priv);
 		WARN_ON(!list_empty(&vm->active_list));
 	}

 	list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link)
 		if (!i915_vma_is_pinned(vma))
 			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
	gpu_is_idle(struct drm_i915_private *dev_priv)
	{
	struct intel_engine_cs *engine;

	for_each_engine(engine, dev_priv) {
	if (intel_engine_is_active(engine))
	return false;
	}

	return true;
	}

	static bool
	mark_free(struct i915_vma vma, unsigned int flags, struct list_head unwind)
	{
	if (i915_vma_is_pinned(vma))
	return false;

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

	if (flags & PIN_NONFAULT && vma->obj->fault_mappable)
	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
	* @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 i915_address_space *vm,
	u64 min_size, u64 alignment,
	unsigned cache_level,
	u64 start, u64 end,
	unsigned flags)
	{
	struct drm_i915_private *dev_priv = to_i915(vm->dev);
	struct list_head eviction_list;
	struct list_head *phases[] = {
	&vm->inactive_list,
	&vm->active_list,
	NULL,
	}, **phase;
	struct i915_vma vma, next;
	int ret;

	trace_i915_gem_evict(vm, 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 in flight,
	* on the active list, again in retirement order.
	*
	* The retirement sequence is thus:
	* 1. Inactive objects (already retired)
	* 2. Active objects (will stall on unbinding)
	*
	* On each list, the oldest objects lie at the HEAD with the freshest
	* object on the TAIL.
	*/
	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);

	if (flags & PIN_NONBLOCK)
	phases[1] = NULL;

	search_again:
	INIT_LIST_HEAD(&eviction_list);
	phase = phases;
	do {
	list_for_each_entry(vma, *phase, vm_link)
	if (mark_free(vma, flags, &eviction_list))
	goto found;
	} while (*++phase);

	/* Nothing found, clean up and bail out! */
	list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
	ret = drm_mm_scan_remove_block(&vma->node);
	BUG_ON(ret);

	INIT_LIST_HEAD(&vma->exec_list);
	}

	/* Can we unpin some objects such as idle hw contents,
	* or pending flips? But since only the GGTT has global entries
	* such as scanouts, rinbuffers and contexts, we can skip the
	* purge when inspecting per-process local address spaces.
	*/
	if (!i915_is_ggtt(vm) \|\| flags & PIN_NONBLOCK)
	return -ENOSPC;

	if (gpu_is_idle(dev_priv)) {
	/* 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(vm->dev) ? -EAGAIN : -ENOSPC;
	}

	/* Not everything in the GGTT is tracked via vma (otherwise we
	* could evict as required with minimal stalling) so we are forced
	* to idle the GPU and explicitly retire outstanding requests in
	* the hopes that we can then remove contexts and the like only
	* bound by their active reference.
	*/
	ret = i915_gem_switch_to_kernel_context(dev_priv);
	if (ret)
	return ret;

	ret = i915_gem_wait_for_idle(dev_priv,
	I915_WAIT_INTERRUPTIBLE \|
	I915_WAIT_LOCKED);
	if (ret)
	return ret;

	i915_gem_retire_requests(dev_priv);
	goto search_again;

	found:
	/* drm_mm doesn't allow any other other operations while
	* scanning, therefore store to-be-evicted objects on a
	* temporary list and take a reference for all before
	* calling unbind (which may remove the active reference
	* of any of our objects, thus corrupting the list).
	*/
	list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
	if (drm_mm_scan_remove_block(&vma->node))
	__i915_vma_pin(vma);
	else
	list_del_init(&vma->exec_list);
	}

	/* Unbinding will emit any required flushes */
	ret = 0;
	while (!list_empty(&eviction_list)) {
	vma = list_first_entry(&eviction_list,
	struct i915_vma,
	exec_list);

	list_del_init(&vma->exec_list);
	__i915_vma_unpin(vma);
	if (ret == 0)
	ret = i915_vma_unbind(vma);
	}
	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 (i915_vma_is_pinned(vma)) {
	if (!vma->exec_entry \|\| i915_vma_pin_count(vma) > 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) {
	struct drm_i915_private *dev_priv = to_i915(vm->dev);

	if (i915_is_ggtt(vm)) {
	ret = i915_gem_switch_to_kernel_context(dev_priv);
	if (ret)
	return ret;
	}

	ret = i915_gem_wait_for_idle(dev_priv,
	I915_WAIT_INTERRUPTIBLE \|
	I915_WAIT_LOCKED);
	if (ret)
	return ret;

	i915_gem_retire_requests(dev_priv);
	WARN_ON(!list_empty(&vm->active_list));
	}

	list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link)
	if (!i915_vma_is_pinned(vma))
	WARN_ON(i915_vma_unbind(vma));

	return 0;
	}