/*
* 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 "drmP.h"
#include "drm.h"
#include "i915_drv.h"
#include "i915_drm.h"
static bool
mark_free(struct drm_i915_gem_object *obj_priv,
struct list_head *unwind)
{
list_add(&obj_priv->evict_list, unwind);
drm_gem_object_reference(&obj_priv->base);
return drm_mm_scan_add_block(obj_priv->gtt_space);
}
int
i915_gem_evict_something(struct drm_device *dev, int min_size, unsigned alignment)
{
drm_i915_private_t *dev_priv = dev->dev_private;
struct list_head eviction_list, unwind_list;
struct drm_i915_gem_object *obj_priv;
int ret = 0;
i915_gem_retire_requests(dev);
/* Re-check for free space after retiring requests */
if (drm_mm_search_free(&dev_priv->mm.gtt_space,
min_size, alignment, 0))
return 0;
/*
* 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);
drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment);
/* First see if there is a large enough contiguous idle region... */
list_for_each_entry(obj_priv, &dev_priv->mm.inactive_list, mm_list) {
if (mark_free(obj_priv, &unwind_list))
goto found;
}
/* Now merge in the soon-to-be-expired objects... */
list_for_each_entry(obj_priv, &dev_priv->mm.active_list, mm_list) {
/* Does the object require an outstanding flush? */
if (obj_priv->base.write_domain || obj_priv->pin_count)
continue;
if (mark_free(obj_priv, &unwind_list))
goto found;
}
/* Finally add anything with a pending flush (in order of retirement) */
list_for_each_entry(obj_priv, &dev_priv->mm.flushing_list, mm_list) {
if (obj_priv->pin_count)
continue;
if (mark_free(obj_priv, &unwind_list))
goto found;
}
list_for_each_entry(obj_priv, &dev_priv->mm.active_list, mm_list) {
if (! obj_priv->base.write_domain || obj_priv->pin_count)
continue;
if (mark_free(obj_priv, &unwind_list))
goto found;
}
/* Nothing found, clean up and bail out! */
list_for_each_entry(obj_priv, &unwind_list, evict_list) {
ret = drm_mm_scan_remove_block(obj_priv->gtt_space);
BUG_ON(ret);
drm_gem_object_unreference(&obj_priv->base);
}
/* We expect the caller to unpin, evict all and try again, or give up.
* So calling i915_gem_evict_everything() is unnecessary.
*/
return -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)) {
obj_priv = list_first_entry(&unwind_list,
struct drm_i915_gem_object,
evict_list);
if (drm_mm_scan_remove_block(obj_priv->gtt_space)) {
list_move(&obj_priv->evict_list, &eviction_list);
continue;
}
list_del(&obj_priv->evict_list);
drm_gem_object_unreference(&obj_priv->base);
}
/* Unbinding will emit any required flushes */
while (!list_empty(&eviction_list)) {
obj_priv = list_first_entry(&eviction_list,
struct drm_i915_gem_object,
evict_list);
if (ret == 0)
ret = i915_gem_object_unbind(&obj_priv->base);
list_del(&obj_priv->evict_list);
drm_gem_object_unreference(&obj_priv->base);
}
return ret;
}
int
i915_gem_evict_everything(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
int ret;
bool lists_empty;
lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
list_empty(&dev_priv->mm.flushing_list) &&
list_empty(&dev_priv->mm.active_list));
if (lists_empty)
return -ENOSPC;
/* Flush everything (on to the inactive lists) and evict */
ret = i915_gpu_idle(dev);
if (ret)
return ret;
BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
ret = i915_gem_evict_inactive(dev);
if (ret)
return ret;
lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
list_empty(&dev_priv->mm.flushing_list) &&
list_empty(&dev_priv->mm.active_list));
BUG_ON(!lists_empty);
return 0;
}
/** Unbinds all inactive objects. */
int
i915_gem_evict_inactive(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
while (!list_empty(&dev_priv->mm.inactive_list)) {
struct drm_gem_object *obj;
int ret;
obj = &list_first_entry(&dev_priv->mm.inactive_list,
struct drm_i915_gem_object,
mm_list)->base;
ret = i915_gem_object_unbind(obj);
if (ret != 0) {
DRM_ERROR("Error unbinding object: %d\n", ret);
return ret;
}
}
return 0;
}
