RE: [PATCH 4/5 v5] arc: Add our own implementation of fb_pgprotect()

Hi Vineet,

From: Alexey Brodkin [abrodkin@synopsys.com] Sent: Monday, March 28, 2016 2:36 PM To: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org; Alexey Brodkin; Vineet Gupta; linux-snps-arc@lists.infradead.org Subject: [PATCH 4/5 v5] arc: Add our own implementation of fb_pgprotect()

During mmaping of frame-buffer pages to user-space fb_protect() is called to set proper page settings.

In case of ARC we need to mark pages that are mmaped to user as uncached because of 2 reasons:

• Huge amount of data if passing through data cache will thrash cache a lot making cache almost useless for other less traffic hungry processes.
• Data written by user in FB will be immediately available for hardware (such as PGU etc) without requirements to flush data cache regularly.

Signed-off-by: Alexey Brodkin abrodkin@synopsys.com Cc: Vineet Gupta vgupta@synopsys.com Cc: linux-snps-arc@lists.infradead.org

Could you please pick up this patch in your tree so in DRM-related series won't be external dependencies any longer?

-Alexey