[PATCH v2 02/16] drm/i915: Change shrink ordering to use locking around unbinding.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Call drop_pages with the gem object lock held, instead of the other
way around. This will allow us to drop the vma bindings with the
gem object lock held.

We plan to require the object lock for unpinning in the future,
and this is an easy target.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@xxxxxxxxx>
---
 drivers/gpu/drm/i915/gem/i915_gem_shrinker.c | 38 ++++++++++----------
 1 file changed, 18 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c b/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
index 157a9765f483..eebff4735781 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
@@ -36,8 +36,8 @@ static bool can_release_pages(struct drm_i915_gem_object *obj)
 	return swap_available() || obj->mm.madv == I915_MADV_DONTNEED;
 }
 
-static bool unsafe_drop_pages(struct drm_i915_gem_object *obj,
-			      unsigned long shrink, bool trylock_vm)
+static int drop_pages(struct drm_i915_gem_object *obj,
+		       unsigned long shrink, bool trylock_vm)
 {
 	unsigned long flags;
 
@@ -214,26 +214,24 @@ i915_gem_shrink(struct i915_gem_ww_ctx *ww,
 
 			spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
 
-			err = 0;
-			if (unsafe_drop_pages(obj, shrink, trylock_vm)) {
-				/* May arrive from get_pages on another bo */
-				if (!ww) {
-					if (!i915_gem_object_trylock(obj))
-						goto skip;
-				} else {
-					err = i915_gem_object_lock(obj, ww);
-					if (err)
-						goto skip;
-				}
-
-				if (!__i915_gem_object_put_pages(obj)) {
-					if (!try_to_writeback(obj, shrink))
-						count += obj->base.size >> PAGE_SHIFT;
-				}
-				if (!ww)
-					i915_gem_object_unlock(obj);
+			/* May arrive from get_pages on another bo */
+			if (!ww) {
+				if (!i915_gem_object_trylock(obj))
+					goto skip;
+			} else {
+				err = i915_gem_object_lock(obj, ww);
+				if (err)
+					goto skip;
 			}
 
+			if (drop_pages(obj, shrink, trylock_vm) &&
+			    !__i915_gem_object_put_pages(obj) &&
+			    !try_to_writeback(obj, shrink))
+				count += obj->base.size >> PAGE_SHIFT;
+
+			if (!ww)
+				i915_gem_object_unlock(obj);
+
 			scanned += obj->base.size >> PAGE_SHIFT;
 skip:
 			i915_gem_object_put(obj);
-- 
2.34.0




[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux