From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Dave Airlie <airlied@linux.ie>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"Xen-devel@lists.xensource.com" <Xen-devel@lists.xensource.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: [PATCH] agp: use DMA API when compiled for Xen as well
Date: Thu, 11 Nov 2010 16:04:38 -0800 [thread overview]
Message-ID: <4CDC8496.7010801@goop.org> (raw)
Xen guests need translation between pseudo-physical and real machine
physical addresses when accessing graphics devices, so use the DMA API
in that case too.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 75e0a34..ce63e5c 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -20,8 +20,12 @@
* an Intel IOMMU. So make the correct use of the PCI DMA API contingent
* on the Intel IOMMU support (CONFIG_DMAR).
* Only newer chipsets need to bother with this, of course.
+ *
+ * Xen guests accessing graphics hardware also need proper translation
+ * between pseudo-physical addresses and real machine addresses, which
+ * is also achieved by using the DMA API.
*/
-#ifdef CONFIG_DMAR
+#if defined(CONFIG_DMAR) || defined(CONFIG_XEN)
#define USE_PCI_DMA_API 1
#endif
reply other threads:[~2010-11-12 0:04 UTC|newest]
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