All of lore.kernel.org
 help / color / mirror / Atom feed
* [Intel-gfx] [PATCH 1/2] drm/i915/gem: Almagamate clflushes on suspend
@ 2021-01-04 14:01 Chris Wilson
  2021-01-04 14:01 ` [Intel-gfx] [PATCH 2/2] drm/i915/gem: Almagamate clflushes on freeze Chris Wilson
                   ` (3 more replies)
  0 siblings, 4 replies; 8+ messages in thread
From: Chris Wilson @ 2021-01-04 14:01 UTC (permalink / raw)
  To: intel-gfx; +Cc: Chris Wilson

When flushing objects larger than the CPU cache it is preferrable to use
a single wbinvd() rather than overlapping clflush(). At runtime, we
avoid wbinvd() due to its system-wide latencies, but during
singlethreaded suspend, no one will observe the imposed latency and we
can opt for the faster wbinvd to clear all objects in a single hit.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gem/i915_gem_pm.c | 34 ++++++--------------------
 1 file changed, 7 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pm.c b/drivers/gpu/drm/i915/gem/i915_gem_pm.c
index 40d3e40500fa..6f9bba1ba20e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pm.c
@@ -32,13 +32,6 @@ void i915_gem_suspend(struct drm_i915_private *i915)
 	i915_gem_drain_freed_objects(i915);
 }
 
-static struct drm_i915_gem_object *first_mm_object(struct list_head *list)
-{
-	return list_first_entry_or_null(list,
-					struct drm_i915_gem_object,
-					mm.link);
-}
-
 void i915_gem_suspend_late(struct drm_i915_private *i915)
 {
 	struct drm_i915_gem_object *obj;
@@ -48,6 +41,7 @@ void i915_gem_suspend_late(struct drm_i915_private *i915)
 		NULL
 	}, **phase;
 	unsigned long flags;
+	bool flush = false;
 
 	/*
 	 * Neither the BIOS, ourselves or any other kernel
@@ -73,29 +67,15 @@ void i915_gem_suspend_late(struct drm_i915_private *i915)
 
 	spin_lock_irqsave(&i915->mm.obj_lock, flags);
 	for (phase = phases; *phase; phase++) {
-		LIST_HEAD(keep);
-
-		while ((obj = first_mm_object(*phase))) {
-			list_move_tail(&obj->mm.link, &keep);
-
-			/* Beware the background _i915_gem_free_objects */
-			if (!kref_get_unless_zero(&obj->base.refcount))
-				continue;
-
-			spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
-
-			i915_gem_object_lock(obj, NULL);
-			drm_WARN_ON(&i915->drm,
-			    i915_gem_object_set_to_gtt_domain(obj, false));
-			i915_gem_object_unlock(obj);
-			i915_gem_object_put(obj);
-
-			spin_lock_irqsave(&i915->mm.obj_lock, flags);
+		list_for_each_entry(obj, *phase, mm.link) {
+			if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ))
+				flush |= (obj->read_domains & I915_GEM_DOMAIN_CPU) == 0;
+			__start_cpu_write(obj); /* presume auto-hibernate */
 		}
-
-		list_splice_tail(&keep, *phase);
 	}
 	spin_unlock_irqrestore(&i915->mm.obj_lock, flags);
+	if (flush)
+		wbinvd_on_all_cpus();
 }
 
 void i915_gem_resume(struct drm_i915_private *i915)
-- 
2.20.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

^ permalink raw reply related	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2021-01-04 20:35 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-01-04 14:01 [Intel-gfx] [PATCH 1/2] drm/i915/gem: Almagamate clflushes on suspend Chris Wilson
2021-01-04 14:01 ` [Intel-gfx] [PATCH 2/2] drm/i915/gem: Almagamate clflushes on freeze Chris Wilson
2021-01-04 20:34   ` kernel test robot
2021-01-04 20:34     ` kernel test robot
2021-01-04 17:04 ` [Intel-gfx] ✓ Fi.CI.BAT: success for series starting with [1/2] drm/i915/gem: Almagamate clflushes on suspend Patchwork
2021-01-04 19:43 ` [Intel-gfx] [PATCH 1/2] " kernel test robot
2021-01-04 19:43   ` kernel test robot
2021-01-04 20:19 ` [Intel-gfx] ✓ Fi.CI.IGT: success for series starting with [1/2] " Patchwork

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.