linux-kernel - [PATCH 3.19.y-ckt 037/196] drm: add helper to check for wc memory support

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Message-Id: <1457483454-30115-38-git-send-email-kamal@canonical.com>
Date:	Tue,  8 Mar 2016 16:28:15 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Dave Airlie <airlied@...hat.com>,
	Oded Gabbay <oded.gabbay@...il.com>,
	Alex Deucher <alexander.deucher@....com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 037/196] drm: add helper to check for wc memory support

3.19.8-ckt16 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

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>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 include/drm/drm_cache.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/drm/drm_cache.h b/include/drm/drm_cache.h
index 7bfb063..461a055 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
-- 
2.7.0