This is a note to let you know that I've just added the patch titled
drm/i915: Flush the PTEs after updating them before suspend
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-flush-the-ptes-after-updating-them-before-suspend.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 91e56499304f3d612053a9cf17f350868182c7d8 Mon Sep 17 00:00:00 2001
From: Chris Wilson <[email protected]>
Date: Thu, 25 Sep 2014 10:13:12 +0100
Subject: drm/i915: Flush the PTEs after updating them before suspend
From: Chris Wilson <[email protected]>
commit 91e56499304f3d612053a9cf17f350868182c7d8 upstream.
As we use WC updates of the PTE, we are responsible for notifying the
hardware when to flush its TLBs. Do so after we zap all the PTEs before
suspend (and the BIOS tries to read our GTT).
Fixes a regression from
commit 828c79087cec61eaf4c76bb32c222fbe35ac3930
Author: Ben Widawsky <[email protected]>
Date: Wed Oct 16 09:21:30 2013 -0700
drm/i915: Disable GGTT PTEs on GEN6+ suspend
that survived and continue to cause harm even after
commit e568af1c626031925465a5caaab7cca1303d55c7
Author: Daniel Vetter <[email protected]>
Date: Wed Mar 26 20:08:20 2014 +0100
drm/i915: Undo gtt scratch pte unmapping again
v2: Trivial rebase.
v3: Fixes requires pointer dances.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82340
Tested-by: [email protected]
Signed-off-by: Chris Wilson <[email protected]>
Cc: Takashi Iwai <[email protected]>
Cc: Paulo Zanoni <[email protected]>
Cc: Todd Previte <[email protected]>
Cc: Daniel Vetter <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -827,6 +827,16 @@ void i915_check_and_clear_faults(struct
POSTING_READ(RING_FAULT_REG(&dev_priv->ring[RCS]));
}
+static void i915_ggtt_flush(struct drm_i915_private *dev_priv)
+{
+ if (INTEL_INFO(dev_priv->dev)->gen < 6) {
+ intel_gtt_chipset_flush();
+ } else {
+ I915_WRITE(GFX_FLSH_CNTL_GEN6, GFX_FLSH_CNTL_EN);
+ POSTING_READ(GFX_FLSH_CNTL_GEN6);
+ }
+}
+
void i915_gem_suspend_gtt_mappings(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -843,6 +853,8 @@ void i915_gem_suspend_gtt_mappings(struc
dev_priv->gtt.base.start / PAGE_SIZE,
dev_priv->gtt.base.total / PAGE_SIZE,
true);
+
+ i915_ggtt_flush(dev_priv);
}
void i915_gem_restore_gtt_mappings(struct drm_device *dev)
@@ -863,7 +875,7 @@ void i915_gem_restore_gtt_mappings(struc
i915_gem_gtt_bind_object(obj, obj->cache_level);
}
- i915_gem_chipset_flush(dev);
+ i915_ggtt_flush(dev_priv);
}
int i915_gem_gtt_prepare_object(struct drm_i915_gem_object *obj)
Patches currently in stable-queue which might be from [email protected]
are
queue-3.14/drm-i915-flush-the-ptes-after-updating-them-before-suspend.patch
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