linux-kernel - [PATCH 4.4 213/342] drm: add helper to check for wc memory support

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Message-Id: <20160301234534.811665658@linuxfoundation.org>
Date:	Tue, 01 Mar 2016 23:54:55 +0000
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	<linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<stable@...r.kernel.org>,
	Christian König <christian.koenig@....com>,
	Michel Dänzer <michel.daenzer@....com>,
	Dave Airlie <airlied@...hat.com>,
	Oded Gabbay <oded.gabbay@...il.com>,
	Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 4.4 213/342] drm: add helper to check for wc memory support

4.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Dave Airlie <airlied@...hat.com>

commit 4b0e4e4af6c6dc8354dcb72182d52c1bc55f12fc upstream.

Reviewed-by: Christian König <christian.koenig@....com>
Reviewed-by: Michel Dänzer <michel.daenzer@....com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

diff --git a/include/drm/drm_cache.h b/include/drm/drm_cache.h
index 7bfb063029d8..461a0558bca4 100644
--- a/include/drm/drm_cache.h
+++ b/include/drm/drm_cache.h
@@ -35,4 +35,13 @@
 
 void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
 
+static inline bool drm_arch_can_wc_memory(void)
+{
+#if defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
+	return false;
+#else
+	return true;
+#endif
+}
+
 #endif