![Chris Wilson](/assets/img/avatar_default.png)
This spinlock only served debugging purposes in a time when we could not be sure of the mutex ever being released upon a GPU hang. As we now should be able rely on hangcheck to do the job for us (and that error reporting should not itself require the struct mutex) we can kill the incomplete attempt at protection. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
267 lines
7.9 KiB
C
267 lines
7.9 KiB
C
/*
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* Copyright © 2008-2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Eric Anholt <eric@anholt.net>
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* Chris Wilson <chris@chris-wilson.co.uuk>
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*
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*/
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#include "drmP.h"
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#include "drm.h"
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#include "i915_drv.h"
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#include "i915_drm.h"
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static struct drm_i915_gem_object *
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i915_gem_next_active_object(struct drm_device *dev,
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struct list_head **render_iter,
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struct list_head **bsd_iter)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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struct drm_i915_gem_object *render_obj = NULL, *bsd_obj = NULL;
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if (*render_iter != &dev_priv->render_ring.active_list)
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render_obj = list_entry(*render_iter,
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struct drm_i915_gem_object,
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list);
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if (HAS_BSD(dev)) {
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if (*bsd_iter != &dev_priv->bsd_ring.active_list)
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bsd_obj = list_entry(*bsd_iter,
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struct drm_i915_gem_object,
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list);
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if (render_obj == NULL) {
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*bsd_iter = (*bsd_iter)->next;
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return bsd_obj;
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}
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if (bsd_obj == NULL) {
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*render_iter = (*render_iter)->next;
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return render_obj;
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}
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/* XXX can we handle seqno wrapping? */
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if (render_obj->last_rendering_seqno < bsd_obj->last_rendering_seqno) {
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*render_iter = (*render_iter)->next;
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return render_obj;
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} else {
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*bsd_iter = (*bsd_iter)->next;
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return bsd_obj;
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}
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} else {
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*render_iter = (*render_iter)->next;
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return render_obj;
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}
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}
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static bool
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mark_free(struct drm_i915_gem_object *obj_priv,
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struct list_head *unwind)
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{
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list_add(&obj_priv->evict_list, unwind);
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return drm_mm_scan_add_block(obj_priv->gtt_space);
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}
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#define i915_for_each_active_object(OBJ, R, B) \
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*(R) = dev_priv->render_ring.active_list.next; \
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*(B) = dev_priv->bsd_ring.active_list.next; \
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while (((OBJ) = i915_gem_next_active_object(dev, (R), (B))) != NULL)
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int
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i915_gem_evict_something(struct drm_device *dev, int min_size, unsigned alignment)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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struct list_head eviction_list, unwind_list;
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struct drm_i915_gem_object *obj_priv, *tmp_obj_priv;
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struct list_head *render_iter, *bsd_iter;
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int ret = 0;
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i915_gem_retire_requests(dev);
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/* Re-check for free space after retiring requests */
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if (drm_mm_search_free(&dev_priv->mm.gtt_space,
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min_size, alignment, 0))
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return 0;
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/*
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* The goal is to evict objects and amalgamate space in LRU order.
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* The oldest idle objects reside on the inactive list, which is in
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* retirement order. The next objects to retire are those on the (per
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* ring) active list that do not have an outstanding flush. Once the
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* hardware reports completion (the seqno is updated after the
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* batchbuffer has been finished) the clean buffer objects would
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* be retired to the inactive list. Any dirty objects would be added
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* to the tail of the flushing list. So after processing the clean
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* active objects we need to emit a MI_FLUSH to retire the flushing
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* list, hence the retirement order of the flushing list is in
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* advance of the dirty objects on the active lists.
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*
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* The retirement sequence is thus:
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* 1. Inactive objects (already retired)
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* 2. Clean active objects
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* 3. Flushing list
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* 4. Dirty active objects.
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*
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* On each list, the oldest objects lie at the HEAD with the freshest
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* object on the TAIL.
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*/
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INIT_LIST_HEAD(&unwind_list);
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drm_mm_init_scan(&dev_priv->mm.gtt_space, min_size, alignment);
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/* First see if there is a large enough contiguous idle region... */
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list_for_each_entry(obj_priv, &dev_priv->mm.inactive_list, list) {
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if (mark_free(obj_priv, &unwind_list))
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goto found;
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}
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/* Now merge in the soon-to-be-expired objects... */
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i915_for_each_active_object(obj_priv, &render_iter, &bsd_iter) {
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/* Does the object require an outstanding flush? */
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if (obj_priv->base.write_domain || obj_priv->pin_count)
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continue;
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if (mark_free(obj_priv, &unwind_list))
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goto found;
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}
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/* Finally add anything with a pending flush (in order of retirement) */
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list_for_each_entry(obj_priv, &dev_priv->mm.flushing_list, list) {
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if (obj_priv->pin_count)
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continue;
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if (mark_free(obj_priv, &unwind_list))
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goto found;
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}
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i915_for_each_active_object(obj_priv, &render_iter, &bsd_iter) {
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if (! obj_priv->base.write_domain || obj_priv->pin_count)
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continue;
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if (mark_free(obj_priv, &unwind_list))
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goto found;
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}
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/* Nothing found, clean up and bail out! */
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list_for_each_entry(obj_priv, &unwind_list, evict_list) {
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ret = drm_mm_scan_remove_block(obj_priv->gtt_space);
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BUG_ON(ret);
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}
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/* We expect the caller to unpin, evict all and try again, or give up.
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* So calling i915_gem_evict_everything() is unnecessary.
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*/
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return -ENOSPC;
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found:
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INIT_LIST_HEAD(&eviction_list);
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list_for_each_entry_safe(obj_priv, tmp_obj_priv,
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&unwind_list, evict_list) {
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if (drm_mm_scan_remove_block(obj_priv->gtt_space)) {
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/* drm_mm doesn't allow any other other operations while
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* scanning, therefore store to be evicted objects on a
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* temporary list. */
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list_move(&obj_priv->evict_list, &eviction_list);
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}
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}
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/* Unbinding will emit any required flushes */
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list_for_each_entry_safe(obj_priv, tmp_obj_priv,
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&eviction_list, evict_list) {
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#if WATCH_LRU
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DRM_INFO("%s: evicting %p\n", __func__, obj);
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#endif
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ret = i915_gem_object_unbind(&obj_priv->base);
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if (ret)
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return ret;
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}
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/* The just created free hole should be on the top of the free stack
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* maintained by drm_mm, so this BUG_ON actually executes in O(1).
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* Furthermore all accessed data has just recently been used, so it
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* should be really fast, too. */
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BUG_ON(!drm_mm_search_free(&dev_priv->mm.gtt_space, min_size,
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alignment, 0));
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return 0;
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}
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int
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i915_gem_evict_everything(struct drm_device *dev)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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int ret;
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bool lists_empty;
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lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
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list_empty(&dev_priv->mm.flushing_list) &&
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list_empty(&dev_priv->render_ring.active_list) &&
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(!HAS_BSD(dev)
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|| list_empty(&dev_priv->bsd_ring.active_list)));
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if (lists_empty)
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return -ENOSPC;
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/* Flush everything (on to the inactive lists) and evict */
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ret = i915_gpu_idle(dev);
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if (ret)
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return ret;
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BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
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ret = i915_gem_evict_inactive(dev);
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if (ret)
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return ret;
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lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
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list_empty(&dev_priv->mm.flushing_list) &&
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list_empty(&dev_priv->render_ring.active_list) &&
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(!HAS_BSD(dev)
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|| list_empty(&dev_priv->bsd_ring.active_list)));
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BUG_ON(!lists_empty);
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return 0;
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}
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/** Unbinds all inactive objects. */
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int
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i915_gem_evict_inactive(struct drm_device *dev)
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{
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drm_i915_private_t *dev_priv = dev->dev_private;
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while (!list_empty(&dev_priv->mm.inactive_list)) {
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struct drm_gem_object *obj;
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int ret;
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obj = &list_first_entry(&dev_priv->mm.inactive_list,
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struct drm_i915_gem_object,
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list)->base;
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ret = i915_gem_object_unbind(obj);
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if (ret != 0) {
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DRM_ERROR("Error unbinding object: %d\n", ret);
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return ret;
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}
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}
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return 0;
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}
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