This is a note to let you know that I've just added the patch titled
agp/intel: Flush chipset writes after updating a single PTE
to the 4.8-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:
agp-intel-flush-chipset-writes-after-updating-a-single-pte.patch
and it can be found in the queue-4.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3497971a71d8b15a41b7bf2bf66ebf5909b2bd3f Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Date: Thu, 18 Aug 2016 17:16:41 +0100
Subject: agp/intel: Flush chipset writes after updating a single PTE
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From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
commit 3497971a71d8b15a41b7bf2bf66ebf5909b2bd3f upstream.
After we update one PTE for a page, the caller expects to be able to
immediately use that through a GGTT read/write. To comply with the
callers expectations we therefore need to flush the chipset buffers
before returning.
Reported-by: Matti Hämäläinen <ccr@xxxxxxxx>
Fixes: d6473f566417 ("drm/i915: Add support for mapping an object page...")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Ankitprasad Sharma <ankitprasad.r.sharma@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Tested-by: Matti Hämäläinen <ccr@xxxxxxxx>
Cc: drm-intel-fixes@xxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-2-chris@xxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/agp/intel-gtt.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -845,6 +845,8 @@ void intel_gtt_insert_page(dma_addr_t ad
unsigned int flags)
{
intel_private.driver->write_entry(addr, pg, flags);
+ if (intel_private.driver->chipset_flush)
+ intel_private.driver->chipset_flush();
}
EXPORT_SYMBOL(intel_gtt_insert_page);
Patches currently in stable-queue which might be from chris@xxxxxxxxxxxxxxxxxx are
queue-4.8/agp-intel-flush-chipset-writes-after-updating-a-single-pte.patch
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