drm/i915: Use vma->exec_entry as our double-entry placeholder
This has the benefit of not requiring us to manipulate the
vma->exec_link list when tearing down the execbuffer, and is a
marginally cheaper test to detect the user error.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170615081435.17699-2-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 1c5a6a6..a7aa21d 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -108,13 +108,40 @@ static int eb_create(struct i915_execbuffer *eb)
eb->and = -eb->args->buffer_count;
}
- INIT_LIST_HEAD(&eb->vmas);
return 0;
}
+static inline void
+__eb_unreserve_vma(struct i915_vma *vma,
+ const struct drm_i915_gem_exec_object2 *entry)
+{
+ if (unlikely(entry->flags & __EXEC_OBJECT_HAS_FENCE))
+ i915_vma_unpin_fence(vma);
+
+ if (entry->flags & __EXEC_OBJECT_HAS_PIN)
+ __i915_vma_unpin(vma);
+}
+
+static void
+eb_unreserve_vma(struct i915_vma *vma)
+{
+ struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
+
+ __eb_unreserve_vma(vma, entry);
+ entry->flags &= ~(__EXEC_OBJECT_HAS_FENCE | __EXEC_OBJECT_HAS_PIN);
+}
+
static void
eb_reset(struct i915_execbuffer *eb)
{
+ struct i915_vma *vma;
+
+ list_for_each_entry(vma, &eb->vmas, exec_list) {
+ eb_unreserve_vma(vma);
+ i915_vma_put(vma);
+ vma->exec_entry = NULL;
+ }
+
if (eb->and >= 0)
memset(eb->buckets, 0, (eb->and+1)*sizeof(struct hlist_head));
}
@@ -146,6 +173,8 @@ eb_lookup_vmas(struct i915_execbuffer *eb)
struct list_head objects;
int i, ret;
+ INIT_LIST_HEAD(&eb->vmas);
+
INIT_LIST_HEAD(&objects);
spin_lock(&eb->file->table_lock);
/* Grab a reference to the object and release the lock so we can lookup
@@ -252,40 +281,23 @@ static struct i915_vma *eb_get_vma(struct i915_execbuffer *eb, unsigned long han
}
}
-static void
-eb_unreserve_vma(struct i915_vma *vma)
-{
- struct drm_i915_gem_exec_object2 *entry;
-
- if (!drm_mm_node_allocated(&vma->node))
- return;
-
- entry = vma->exec_entry;
-
- if (entry->flags & __EXEC_OBJECT_HAS_FENCE)
- i915_vma_unpin_fence(vma);
-
- if (entry->flags & __EXEC_OBJECT_HAS_PIN)
- __i915_vma_unpin(vma);
-
- entry->flags &= ~(__EXEC_OBJECT_HAS_FENCE | __EXEC_OBJECT_HAS_PIN);
-}
-
static void eb_destroy(struct i915_execbuffer *eb)
{
- i915_gem_context_put(eb->ctx);
+ struct i915_vma *vma;
- while (!list_empty(&eb->vmas)) {
- struct i915_vma *vma;
+ list_for_each_entry(vma, &eb->vmas, exec_list) {
+ if (!vma->exec_entry)
+ continue;
- vma = list_first_entry(&eb->vmas,
- struct i915_vma,
- exec_list);
- list_del_init(&vma->exec_list);
- eb_unreserve_vma(vma);
+ __eb_unreserve_vma(vma, vma->exec_entry);
vma->exec_entry = NULL;
i915_vma_put(vma);
}
+
+ i915_gem_context_put(eb->ctx);
+
+ if (eb->buckets)
+ kfree(eb->buckets);
}
static inline int use_cpu_reloc(struct drm_i915_gem_object *obj)
@@ -985,13 +997,7 @@ eb_relocate_slow(struct i915_execbuffer *eb)
int i, total, ret;
/* We may process another execbuffer during the unlock... */
- while (!list_empty(&eb->vmas)) {
- vma = list_first_entry(&eb->vmas, struct i915_vma, exec_list);
- list_del_init(&vma->exec_list);
- eb_unreserve_vma(vma);
- i915_vma_put(vma);
- }
-
+ eb_reset(eb);
mutex_unlock(&dev->struct_mutex);
total = 0;
@@ -1052,7 +1058,6 @@ eb_relocate_slow(struct i915_execbuffer *eb)
}
/* reacquire the objects */
- eb_reset(eb);
ret = eb_lookup_vmas(eb);
if (ret)
goto err;