From: Alexey Brodkin <Alexey.Brodkin@synopsys.com> To: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, Alexey Brodkin <Alexey.Brodkin@synopsys.com>, linux-snps-arc@lists.infradead.org Subject: [PATCH 4/5 v4] arc: Add our own implementation of fb_pgprotect() Date: Thu, 24 Mar 2016 19:48:35 +0300 [thread overview] Message-ID: <1458838116-24954-5-git-send-email-abrodkin@synopsys.com> (raw) In-Reply-To: <1458838116-24954-1-git-send-email-abrodkin@synopsys.com> 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
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From: Alexey.Brodkin@synopsys.com (Alexey Brodkin) To: linux-snps-arc@lists.infradead.org Subject: [PATCH 4/5 v4] arc: Add our own implementation of fb_pgprotect() Date: Thu, 24 Mar 2016 19:48:35 +0300 [thread overview] Message-ID: <1458838116-24954-5-git-send-email-abrodkin@synopsys.com> (raw) In-Reply-To: <1458838116-24954-1-git-send-email-abrodkin@synopsys.com> 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 at synopsys.com> Cc: linux-snps-arc at 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
next prev parent reply other threads:[~2016-03-24 16:49 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-03-24 16:48 [PATCH 0/5 v4] drm: Add support of ARC PGU display controller Alexey Brodkin 2016-03-24 16:48 ` Alexey Brodkin 2016-03-24 16:48 ` Alexey Brodkin 2016-03-24 16:48 ` [PATCH 1/5 " Alexey Brodkin 2016-03-24 16:48 ` Alexey Brodkin 2016-03-24 16:48 ` Alexey Brodkin 2016-03-24 17:37 ` kbuild test robot 2016-03-24 17:37 ` kbuild test robot 2016-03-24 17:37 ` kbuild test robot 2016-03-24 21:12 ` Alexey Brodkin 2016-03-24 21:12 ` Alexey Brodkin 2016-03-24 21:12 ` Alexey Brodkin 2016-03-24 16:48 ` [PATCH 2/5 v4] drm: Add DT bindings documentation for " Alexey Brodkin 2016-03-24 16:48 ` Alexey Brodkin 2016-03-24 16:48 ` Alexey Brodkin 2016-03-25 14:39 ` Rob Herring 2016-03-25 14:39 ` Rob Herring 2016-03-25 14:39 ` Rob Herring 2016-03-24 16:48 ` [PATCH 3/5 v4] MAINTAINERS: Add maintainer " Alexey Brodkin 2016-03-24 16:48 ` Alexey Brodkin 2016-03-24 16:48 ` Alexey Brodkin 2016-03-24 16:48 ` Alexey Brodkin [this message] 2016-03-24 16:48 ` [PATCH 4/5 v4] arc: Add our own implementation of fb_pgprotect() Alexey Brodkin 2016-03-24 16:48 ` [PATCH 5/5 v4] arc: axs10x - add support of ARC PGU Alexey Brodkin 2016-03-24 16:48 ` Alexey Brodkin 2016-03-24 16:48 ` Alexey Brodkin
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