drm: Move drm_clflush prototypes to drm_cache header file

Continue to clean up drmP.h by moving the cache flushing functions into
it's own header file.

Compile-tested only

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170109215649.6860-2-krisman@collabora.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -49,6 +49,7 @@
 #include <drm/drm_legacy.h> /* for struct drm_dma_handle */
 #include <drm/drm_gem.h>
 #include <drm/drm_auth.h>
+#include <drm/drm_cache.h>
 
 #include "i915_params.h"
 #include "i915_reg.h"

drivers/gpu/drm/vgem/vgem_drv.h

@@ -31,6 +31,7 @@
 
 #include <drm/drmP.h>
 #include <drm/drm_gem.h>
+#include <drm/drm_cache.h>
 
 #include <uapi/drm/vgem_drm.h>
 

include/drm/drmP.h

@@ -731,11 +731,6 @@ int drm_noop(struct drm_device *dev, void *data,
 int drm_invalid_op(struct drm_device *dev, void *data,
 		   struct drm_file *file_priv);
 
-/* Cache management (drm_cache.c) */
-void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
-void drm_clflush_sg(struct sg_table *st);
-void drm_clflush_virt_range(void *addr, unsigned long length);
-
 /*
  * These are exported to drivers so that they can implement fencing using
  * DMA quiscent + idle. DMA quiescent usually requires the hardware lock.

include/drm/drm_cache.h

@@ -33,7 +33,11 @@
 #ifndef _DRM_CACHE_H_
 #define _DRM_CACHE_H_
 
+#include <linux/scatterlist.h>
+
 void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
+void drm_clflush_sg(struct sg_table *st);
+void drm_clflush_virt_range(void *addr, unsigned long length);
 
 static inline bool drm_arch_can_wc_memory(void)
 {