diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_evict.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_evict.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c new file mode 100644 index 0000000..c86d5d9 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_gem_evict.c @@ -0,0 +1,185 @@ +/* + * 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 "i915_drv.h" +#include <drm/i915_drm.h> +#include "i915_trace.h" + +static bool +mark_free(struct drm_i915_gem_object *obj, struct list_head *unwind) +{ + if (obj->pin_count) + return false; + + list_add(&obj->exec_list, unwind); + return drm_mm_scan_add_block(obj->gtt_space); +} + +int +i915_gem_evict_something(struct drm_device *dev, int min_size, + unsigned alignment, unsigned cache_level, + bool mappable, bool nonblocking) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + struct list_head eviction_list, unwind_list; + struct drm_i915_gem_object *obj; + int ret = 0; + + trace_i915_gem_evict(dev, min_size, alignment, mappable); + + /* + * 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 (mappable) + drm_mm_init_scan_with_range(&dev_priv->mm.gtt_space, + min_size, alignment, cache_level, + 0, dev_priv->gtt.mappable_end); + else + drm_mm_init_scan(&dev_priv->mm.gtt_space, + min_size, alignment, cache_level); + + /* First see if there is a large enough contiguous idle region... */ + list_for_each_entry(obj, &dev_priv->mm.inactive_list, mm_list) { + if (mark_free(obj, &unwind_list)) + goto found; + } + + if (nonblocking) + goto none; + + /* Now merge in the soon-to-be-expired objects... */ + list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) { + if (mark_free(obj, &unwind_list)) + goto found; + } + +none: + /* Nothing found, clean up and bail out! */ + while (!list_empty(&unwind_list)) { + obj = list_first_entry(&unwind_list, + struct drm_i915_gem_object, + exec_list); + + ret = drm_mm_scan_remove_block(obj->gtt_space); + BUG_ON(ret); + + list_del_init(&obj->exec_list); + } + + /* 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 = list_first_entry(&unwind_list, + struct drm_i915_gem_object, + exec_list); + if (drm_mm_scan_remove_block(obj->gtt_space)) { + list_move(&obj->exec_list, &eviction_list); + drm_gem_object_reference(&obj->base); + continue; + } + list_del_init(&obj->exec_list); + } + + /* Unbinding will emit any required flushes */ + while (!list_empty(&eviction_list)) { + obj = list_first_entry(&eviction_list, + struct drm_i915_gem_object, + exec_list); + if (ret == 0) + ret = i915_gem_object_unbind(obj); + + list_del_init(&obj->exec_list); + drm_gem_object_unreference(&obj->base); + } + + return ret; +} + +int +i915_gem_evict_everything(struct drm_device *dev) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + struct drm_i915_gem_object *obj, *next; + bool lists_empty; + int ret; + + lists_empty = (list_empty(&dev_priv->mm.inactive_list) && + list_empty(&dev_priv->mm.active_list)); + 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(obj, next, + &dev_priv->mm.inactive_list, mm_list) + if (obj->pin_count == 0) + WARN_ON(i915_gem_object_unbind(obj)); + + return 0; +} |