From patchwork Mon Mar 28 11:36:38 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexey Brodkin X-Patchwork-Id: 8680861 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 141F2C0554 for ; Tue, 29 Mar 2016 00:39:24 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 47B3620274 for ; Tue, 29 Mar 2016 00:39:23 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 5FA7820220 for ; Tue, 29 Mar 2016 00:39:22 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B4BB36E5FA; Tue, 29 Mar 2016 00:38:28 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from smtprelay.synopsys.com (us01smtprelay-2.synopsys.com [198.182.47.9]) by gabe.freedesktop.org (Postfix) with ESMTPS id 957926E3C2 for ; Mon, 28 Mar 2016 11:37:09 +0000 (UTC) Received: from us02secmta2.synopsys.com (us02secmta2.synopsys.com [10.12.235.98]) by smtprelay.synopsys.com (Postfix) with ESMTP id 4BE2A24E170A; Mon, 28 Mar 2016 04:37:09 -0700 (PDT) Received: from us02secmta2.internal.synopsys.com (us02secmta2.internal.synopsys.com [127.0.0.1]) by us02secmta2.internal.synopsys.com (Service) with ESMTP id 3F22E55F13; Mon, 28 Mar 2016 04:37:09 -0700 (PDT) Received: from mailhost.synopsys.com (unknown [10.13.184.66]) by us02secmta2.internal.synopsys.com (Service) with ESMTP id 179FB55F02; Mon, 28 Mar 2016 04:37:09 -0700 (PDT) Received: from mailhost.synopsys.com (localhost [127.0.0.1]) by mailhost.synopsys.com (Postfix) with ESMTP id 07A52E98; Mon, 28 Mar 2016 04:37:09 -0700 (PDT) Received: from abrodkin-7440l.internal.synopsys.com (unknown [10.225.15.82]) by mailhost.synopsys.com (Postfix) with ESMTP id E1E0EE92; Mon, 28 Mar 2016 04:37:06 -0700 (PDT) From: Alexey Brodkin To: dri-devel@lists.freedesktop.org Subject: [PATCH 4/5 v5] arc: Add our own implementation of fb_pgprotect() Date: Mon, 28 Mar 2016 14:36:38 +0300 Message-Id: <1459164999-11850-5-git-send-email-abrodkin@synopsys.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1459164999-11850-1-git-send-email-abrodkin@synopsys.com> References: <1459164999-11850-1-git-send-email-abrodkin@synopsys.com> X-Mailman-Approved-At: Tue, 29 Mar 2016 00:38:17 +0000 Cc: linux-snps-arc@lists.infradead.org, Vineet Gupta , Alexey Brodkin , linux-kernel@vger.kernel.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Cc: Vineet Gupta Cc: linux-snps-arc@lists.infradead.org --- No changes v4 -> v5. 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 +#include +#include + +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_ */