Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1364333

[PATCH 4/5 v4] arc: Add our own implementation of fb_pgprotect()

Show all headers | View raw

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: linux-snps-arc@lists.infradead.org
---

Changes v3 -> v4:
 * This change was introduced only in v4.

 arch/arc/include/asm/fb.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 arch/arc/include/asm/fb.h

diff --git a/arch/arc/include/asm/fb.h b/arch/arc/include/asm/fb.h
new file mode 100644
index 0000000..bd3f68c
--- /dev/null
+++ b/arch/arc/include/asm/fb.h
@@ -0,0 +1,19 @@
+#ifndef _ASM_FB_H_
+#define _ASM_FB_H_
+
+#include <linux/fb.h>
+#include <linux/fs.h>
+#include <asm/page.h>
+
+static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
+				unsigned long off)
+{
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+}
+
+static inline int fb_is_primary_device(struct fb_info *info)
+{
+	return 0;
+}
+
+#endif /* _ASM_FB_H_ */
-- 
2.5.0

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH 0/5 v4] drm: Add support of ARC PGU display controller Alexey Brodkin <Alexey.Brodkin@synopsys.com> - 2016-03-24 17:50 +0100
  [PATCH 3/5 v4] MAINTAINERS: Add maintainer for ARC PGU display controller Alexey Brodkin <Alexey.Brodkin@synopsys.com> - 2016-03-24 17:50 +0100
  [PATCH 4/5 v4] arc: Add our own implementation of fb_pgprotect() Alexey Brodkin <Alexey.Brodkin@synopsys.com> - 2016-03-24 17:50 +0100
  [PATCH 5/5 v4] arc: axs10x - add support of ARC PGU Alexey Brodkin <Alexey.Brodkin@synopsys.com> - 2016-03-24 17:50 +0100
  [PATCH 2/5 v4] drm: Add DT bindings documentation for ARC PGU display controller Alexey Brodkin <Alexey.Brodkin@synopsys.com> - 2016-03-24 17:50 +0100
    Re: [PATCH 2/5 v4] drm: Add DT bindings documentation for ARC PGU  display controller Rob Herring <robh@kernel.org> - 2016-03-25 15:50 +0100
  [PATCH 1/5 v4] drm: Add support of ARC PGU display controller Alexey Brodkin <Alexey.Brodkin@synopsys.com> - 2016-03-24 17:50 +0100

csiph-web