From patchwork Fri Mar 20 23:18:26 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Luis R. Rodriguez" X-Patchwork-Id: 6062551 Return-Path: X-Original-To: patchwork-linux-fbdev@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 4029BBF90F for ; Sat, 21 Mar 2015 00:40:19 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 23D662053D for ; Sat, 21 Mar 2015 00:40:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DC50920549 for ; Sat, 21 Mar 2015 00:40:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752601AbbCUAkO (ORCPT ); Fri, 20 Mar 2015 20:40:14 -0400 Received: from mail-pa0-f47.google.com ([209.85.220.47]:36786 "EHLO mail-pa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752500AbbCUAkM (ORCPT ); Fri, 20 Mar 2015 20:40:12 -0400 Received: by padcy3 with SMTP id cy3so124332270pad.3; Fri, 20 Mar 2015 17:40:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=pSm/6392PSuASAmk67u4/9k3MnL2ZmBXnve7UOcxZkw=; b=Fg/5oQpXEgOgnwK8FXMv0oUxyJiODc7skbRsnItEI5w+9aC5SOUBomCOAybbwwu6mz 35BDxKSfuOqC9LCOEqMhqVm8SNVQ+fXBUxO8N/XmCH+M8vNnAljbLVjjsV6hTr9qQOG4 KyW9hJiH5nh+IoNRhBxBCYzEB6FMvAGNdwwveTn+nMKOspSm+DxMEjBpr0jJ0EdP29qF FvxT6qpG/nOFCAtDi9xygPDgthCV8xh/5ontZHQdJxUvv7aMbq00oYF4+9L3Kw9yCDgp bV6dGNmjc7pvYF2PGcATQPt/kdqvIkn10Cy4dLfY6bSEdZvpEU0occzVqn4icJeREa/+ 9wyw== X-Received: by 10.66.164.163 with SMTP id yr3mr162662955pab.154.1426898411989; Fri, 20 Mar 2015 17:40:11 -0700 (PDT) Received: from mcgrof@gmail.com (c-98-234-145-61.hsd1.ca.comcast.net. [98.234.145.61]) by mx.google.com with ESMTPSA id um16sm9927376pab.7.2015.03.20.17.40.08 (version=TLSv1 cipher=RC4-SHA bits=128/128); Fri, 20 Mar 2015 17:40:10 -0700 (PDT) Received: by mcgrof@gmail.com (sSMTP sendmail emulation); Fri, 20 Mar 2015 17:38:00 -0700 From: "Luis R. Rodriguez" To: luto@amacapital.net, mingo@redhat.com, tglx@linutronix.de, hpa@zytor.com, jgross@suse.com, JBeulich@suse.com, bp@suse.de, suresh.b.siddha@intel.com, venkatesh.pallipadi@intel.com, airlied@redhat.com Cc: linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org, x86@kernel.org, xen-devel@lists.xenproject.org, "Luis R. Rodriguez" , Ingo Molnar , Daniel Vetter , Antonino Daplas , Jean-Christophe Plagniol-Villard , Tomi Valkeinen Subject: [PATCH v1 36/47] video: fbdev: i810: use arch_phys_wc_add() and ioremap_wc() Date: Fri, 20 Mar 2015 16:18:26 -0700 Message-Id: <1426893517-2511-37-git-send-email-mcgrof@do-not-panic.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1426893517-2511-1-git-send-email-mcgrof@do-not-panic.com> References: <1426893517-2511-1-git-send-email-mcgrof@do-not-panic.com> Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID,T_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 From: "Luis R. Rodriguez" The same area used for MTRR is used for the ioremap() area. Convert the driver from using the x86 specific MTRR code to the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add() will avoid MTRR if write-combining is available, in order to take advantage of that also ensure the ioremap'd area is requested as write-combining. There are a few motivations for this: a) Take advantage of PAT when available b) Help bury MTRR code away, MTRR is architecture specific and on x86 its replaced by PAT c) Help with the goal of eventually using _PAGE_CACHE_UC over _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e) The conversion done is expressed by the following Coccinelle SmPL patch, it additionally required manual intervention to address all the #ifdery and removal of redundant things which arch_phys_wc_add() already addresses such as verbose message about when MTRR fails and doing nothing when we didn't get an MTRR. @ mtrr_found @ expression index, base, size; @@ -index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1); +index = arch_phys_wc_add(base, size); @ mtrr_rm depends on mtrr_found @ expression mtrr_found.index, mtrr_found.base, mtrr_found.size; @@ -mtrr_del(index, base, size); +arch_phys_wc_del(index); @ mtrr_rm_zero_arg depends on mtrr_found @ expression mtrr_found.index; @@ -mtrr_del(index, 0, 0); +arch_phys_wc_del(index); @ mtrr_rm_fb_info depends on mtrr_found @ struct fb_info *info; expression mtrr_found.index; @@ -mtrr_del(index, info->fix.smem_start, info->fix.smem_len); +arch_phys_wc_del(index); @ ioremap_replace_nocache depends on mtrr_found @ struct fb_info *info; expression base, size; @@ -info->screen_base = ioremap_nocache(base, size); +info->screen_base = ioremap_wc(base, size); @ ioremap_replace_default depends on mtrr_found @ struct fb_info *info; expression base, size; @@ -info->screen_base = ioremap(base, size); +info->screen_base = ioremap_wc(base, size); Generated-by: Coccinelle SmPL Cc: Suresh Siddha Cc: Venkatesh Pallipadi Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Juergen Gross Cc: Daniel Vetter Cc: Andy Lutomirski Cc: Dave Airlie Cc: Antonino Daplas Cc: Jean-Christophe Plagniol-Villard Cc: Tomi Valkeinen Cc: linux-fbdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Juergen Gross Cc: Daniel Vetter Cc: Andy Lutomirski Cc: Dave Airlie Cc: Antonino Daplas Cc: Jean-Christophe Plagniol-Villard Cc: Tomi Valkeinen Cc: linux-fbdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Luis R. Rodriguez --- drivers/video/fbdev/i810/i810.h | 3 +-- drivers/video/fbdev/i810/i810_main.c | 11 +++++++---- drivers/video/fbdev/i810/i810_main.h | 26 -------------------------- 3 files changed, 8 insertions(+), 32 deletions(-) diff --git a/drivers/video/fbdev/i810/i810.h b/drivers/video/fbdev/i810/i810.h index 1414b73..7b1c002 100644 --- a/drivers/video/fbdev/i810/i810.h +++ b/drivers/video/fbdev/i810/i810.h @@ -199,7 +199,6 @@ #define HAS_FONTCACHE 8 /* driver flags */ -#define HAS_MTRR 1 #define HAS_ACCELERATION 2 #define ALWAYS_SYNC 4 #define LOCKUP 8 @@ -281,7 +280,7 @@ struct i810fb_par { u32 ovract; u32 cur_state; u32 ddc_num; - int mtrr_reg; + int wc_cookie; u16 bltcntl; u8 interlace; }; diff --git a/drivers/video/fbdev/i810/i810_main.c b/drivers/video/fbdev/i810/i810_main.c index bb674e4..025b882 100644 --- a/drivers/video/fbdev/i810/i810_main.c +++ b/drivers/video/fbdev/i810/i810_main.c @@ -41,6 +41,7 @@ #include #include #include +#include #include #include @@ -1816,7 +1817,9 @@ static void i810_init_device(struct i810fb_par *par) u8 reg; u8 __iomem *mmio = par->mmio_start_virtual; - if (mtrr) set_mtrr(par); + if (mtrr) + par->wc_cookie= arch_phys_wc_add((u32) par->aperture.physical, + par->aperture.size); i810_init_cursor(par); @@ -1865,8 +1868,8 @@ static int i810_allocate_pci_resource(struct i810fb_par *par, } par->res_flags |= FRAMEBUFFER_REQ; - par->aperture.virtual = ioremap_nocache(par->aperture.physical, - par->aperture.size); + par->aperture.virtual = ioremap_wc(par->aperture.physical, + par->aperture.size); if (!par->aperture.virtual) { printk("i810fb_init: cannot remap framebuffer region\n"); return -ENODEV; @@ -2096,7 +2099,7 @@ static void i810fb_release_resource(struct fb_info *info, struct i810fb_par *par) { struct gtt_data *gtt = &par->i810_gtt; - unset_mtrr(par); + arch_phys_wc_del(par->wc_cookie); i810_delete_i2c_busses(par); diff --git a/drivers/video/fbdev/i810/i810_main.h b/drivers/video/fbdev/i810/i810_main.h index a25afaa..7bfaaad 100644 --- a/drivers/video/fbdev/i810/i810_main.h +++ b/drivers/video/fbdev/i810/i810_main.h @@ -60,32 +60,6 @@ static inline void flush_cache(void) #define flush_cache() do { } while(0) #endif -#ifdef CONFIG_MTRR - -#include - -static inline void set_mtrr(struct i810fb_par *par) -{ - par->mtrr_reg = mtrr_add((u32) par->aperture.physical, - par->aperture.size, MTRR_TYPE_WRCOMB, 1); - if (par->mtrr_reg < 0) { - printk(KERN_ERR "set_mtrr: unable to set MTRR\n"); - return; - } - par->dev_flags |= HAS_MTRR; -} -static inline void unset_mtrr(struct i810fb_par *par) -{ - if (par->dev_flags & HAS_MTRR) - mtrr_del(par->mtrr_reg, (u32) par->aperture.physical, - par->aperture.size); -} -#else -#define set_mtrr(x) printk("set_mtrr: MTRR is disabled in the kernel\n") - -#define unset_mtrr(x) do { } while (0) -#endif /* CONFIG_MTRR */ - #ifdef CONFIG_FB_I810_GTF #define IS_DVT (0) #else