1 files changed, 271 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 000000000000..72cae3cccad8
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -0,0 +1,271 @@
+/*
+ * 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 struct drm_i915_gem_object *
+i915_gem_next_active_object(struct drm_device *dev,
+                            struct list_head **render_iter,
+                            struct list_head **bsd_iter)
+{
+        drm_i915_private_t *dev_priv = dev->dev_private;
+        struct drm_i915_gem_object *render_obj = NULL, *bsd_obj = NULL;
+
+        if (*render_iter != &dev_priv->render_ring.active_list)
+                render_obj = list_entry(*render_iter,
+                                        struct drm_i915_gem_object,
+                                        list);
+
+        if (HAS_BSD(dev)) {
+                if (*bsd_iter != &dev_priv->bsd_ring.active_list)
+                        bsd_obj = list_entry(*bsd_iter,
+                                             struct drm_i915_gem_object,
+                                             list);
+
+                if (render_obj == NULL) {
+                        *bsd_iter = (*bsd_iter)->next;
+                        return bsd_obj;
+                }
+
+                if (bsd_obj == NULL) {
+                        *render_iter = (*render_iter)->next;
+                        return render_obj;
+                }
+
+                /* XXX can we handle seqno wrapping? */
+                if (render_obj->last_rendering_seqno < bsd_obj->last_rendering_seqno) {
+                        *render_iter = (*render_iter)->next;
+                        return render_obj;
+                } else {
+                        *bsd_iter = (*bsd_iter)->next;
+                        return bsd_obj;
+                }
+        } else {
+                *render_iter = (*render_iter)->next;
+                return render_obj;
+        }
+}
+
+static bool
+mark_free(struct drm_i915_gem_object *obj_priv,
+           struct list_head *unwind)
+{
+        list_add(&obj_priv->evict_list, unwind);
+        return drm_mm_scan_add_block(obj_priv->gtt_space);
+}
+
+#define i915_for_each_active_object(OBJ, R, B) \
+        *(R) = dev_priv->render_ring.active_list.next; \
+        *(B) = dev_priv->bsd_ring.active_list.next; \
+        while (((OBJ) = i915_gem_next_active_object(dev, (R), (B))) != NULL)
+
+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, *tmp_obj_priv;
+        struct list_head *render_iter, *bsd_iter;
+        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, list) {
+                if (mark_free(obj_priv, &unwind_list))
+                        goto found;
+        }
+
+        /* Now merge in the soon-to-be-expired objects... */
+        i915_for_each_active_object(obj_priv, &render_iter, &bsd_iter) {
+                /* 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, list) {
+                if (obj_priv->pin_count)
+                        continue;
+
+                if (mark_free(obj_priv, &unwind_list))
+                        goto found;
+        }
+        i915_for_each_active_object(obj_priv, &render_iter, &bsd_iter) {
+                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);
+        }
+
+        /* 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:
+        INIT_LIST_HEAD(&eviction_list);
+        list_for_each_entry_safe(obj_priv, tmp_obj_priv,
+                                 &unwind_list, evict_list) {
+                if (drm_mm_scan_remove_block(obj_priv->gtt_space)) {
+                        /* drm_mm doesn't allow any other other operations while
+                         * scanning, therefore store to be evicted objects on a
+                         * temporary list. */
+                        list_move(&obj_priv->evict_list, &eviction_list);
+                }
+        }
+
+        /* Unbinding will emit any required flushes */
+        list_for_each_entry_safe(obj_priv, tmp_obj_priv,
+                                 &eviction_list, evict_list) {
+#if WATCH_LRU
+                DRM_INFO("%s: evicting %p\n", __func__, obj);
+#endif
+                ret = i915_gem_object_unbind(&obj_priv->base);
+                if (ret)
+                        return ret;
+        }
+
+        /* The just created free hole should be on the top of the free stack
+         * maintained by drm_mm, so this BUG_ON actually executes in O(1).
+         * Furthermore all accessed data has just recently been used, so it
+         * should be really fast, too. */
+        BUG_ON(!drm_mm_search_free(&dev_priv->mm.gtt_space, min_size,
+                                   alignment, 0));
+
+        return 0;
+}
+
+int
+i915_gem_evict_everything(struct drm_device *dev)
+{
+        drm_i915_private_t *dev_priv = dev->dev_private;
+        int ret;
+        bool lists_empty;
+
+        spin_lock(&dev_priv->mm.active_list_lock);
+        lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
+                       list_empty(&dev_priv->mm.flushing_list) &&
+                       list_empty(&dev_priv->render_ring.active_list) &&
+                       (!HAS_BSD(dev)
+                        || list_empty(&dev_priv->bsd_ring.active_list)));
+        spin_unlock(&dev_priv->mm.active_list_lock);
+
+        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;
+
+        spin_lock(&dev_priv->mm.active_list_lock);
+        lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
+                       list_empty(&dev_priv->mm.flushing_list) &&
+                       list_empty(&dev_priv->render_ring.active_list) &&
+                       (!HAS_BSD(dev)
+                        || list_empty(&dev_priv->bsd_ring.active_list)));
+        spin_unlock(&dev_priv->mm.active_list_lock);
+        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,
+                                        list)->base;
+
+                ret = i915_gem_object_unbind(obj);
+                if (ret != 0) {
+                        DRM_ERROR("Error unbinding object: %d\n", ret);
+                        return ret;
+                }
+        }
+
+        return 0;
+}