linux-kernel - [29/80] agp/intel: fix physical address mask bits for sandybridge

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Date:	Fri, 24 Sep 2010 09:24:17 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk, tiwai@...e.de,
	chris@...is-wilson.co.uk, Zhenyu Wang <zhenyuw@...ux.intel.com>
Subject: [29/80] agp/intel: fix physical address mask bits for sandybridge

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Zhenyu Wang <zhenyuw@...ux.intel.com>

[This is backport patch from upstream 8dfc2b14.]

Signed-off-by: Zhenyu Wang <zhenyuw@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/char/agp/intel-gtt.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -1317,6 +1317,16 @@ static unsigned long intel_i965_mask_mem
 	return addr | bridge->driver->masks[type].mask;
 }
 
+static unsigned long intel_gen6_mask_memory(struct agp_bridge_data *bridge,
+					    dma_addr_t addr, int type)
+{
+	/* gen6 has bit11-4 for physical addr bit39-32 */
+	addr |= (addr >> 28) & 0xff0;
+
+	/* Type checking must be done elsewhere */
+	return addr | bridge->driver->masks[type].mask;
+}
+
 static void intel_i965_get_gtt_range(int *gtt_offset, int *gtt_size)
 {
 	u16 snb_gmch_ctl;
@@ -1535,7 +1545,7 @@ static const struct agp_bridge_driver in
 	.configure		= intel_i9xx_configure,
 	.fetch_size		= intel_i9xx_fetch_size,
 	.cleanup		= intel_i915_cleanup,
-	.mask_memory		= intel_i965_mask_memory,
+	.mask_memory		= intel_gen6_mask_memory,
 	.masks			= intel_i810_masks,
 	.agp_enable		= intel_i810_agp_enable,
 	.cache_flush		= global_cache_flush,


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