From patchwork Fri Jun 19 22:08:31 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: 486914 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 9592F1401DE for ; Sat, 20 Jun 2015 08:28:19 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b=Pk5o7Ets; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754328AbbFSW2Q (ORCPT ); Fri, 19 Jun 2015 18:28:16 -0400 Received: from mail-pd0-f176.google.com ([209.85.192.176]:35132 "EHLO mail-pd0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751984AbbFSW2P (ORCPT ); Fri, 19 Jun 2015 18:28:15 -0400 Received: by pdbci14 with SMTP id ci14so40480378pdb.2; Fri, 19 Jun 2015 15:28:15 -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=55pUVe2wWjSWsmLDvcxY6vexRGb7l6sw6z+u09bg+uw=; b=Pk5o7EtsUiKQoO/WcULRia/qDLo3hmmavJDx64ABBtOZD7aaANJdCEFlz7jPDkgX5n fY8c41FPhWggsmcy6oNqKWG+LcyBhr3fX9vbQ0d1NB6/iz3nxIkq3eOWL13KkuUVIhj/ qsrW/OvWm5XFdDsn92kQlg0rSkHFLRvWtb96FxYIOzDymuIK33sO9iwod+Vc4bc+QnRa DSn908MCsfepLwZNfR7oneaFDrQi+xxX8B1DOkPpx+8dpfqN+kH7qbhQ3V/0GJnBwH1Y g5B+9vu/KzYHZ0kQkOs1hD3tx8N9QEJfztx0DGH+upJdIC+ZvRMlwmMAGA0OGwJj4tcq FP4w== X-Received: by 10.70.128.34 with SMTP id nl2mr36314055pdb.43.1434752894914; Fri, 19 Jun 2015 15:28:14 -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 w1sm12189021pbs.35.2015.06.19.15.28.11 (version=TLSv1 cipher=RC4-SHA bits=128/128); Fri, 19 Jun 2015 15:28:13 -0700 (PDT) Received: by mcgrof@gmail.com (sSMTP sendmail emulation); Fri, 19 Jun 2015 15:26:04 -0700 From: "Luis R. Rodriguez" To: arnd@arndb.de Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, xen-devel@lists.xensource.com, linux-fbdev@vger.kernel.org, "Luis R. Rodriguez" , Jean-Christophe Plagniol-Villard , Tomi Valkeinen , Jingoo Han , Geert Uytterhoeven , Daniel Vetter , "Lad, Prabhakar" , Rickard Strandqvist , Suresh Siddha , Ingo Molnar , Thomas Gleixner , Juergen Gross , Andy Lutomirski , Dave Airlie , Antonino Daplas Subject: [PATCH v7 8/9] video: fbdev: s3fb: use arch_phys_wc_add() and pci_iomap_wc() Date: Fri, 19 Jun 2015 15:08:31 -0700 Message-Id: <1434751712-24333-9-git-send-email-mcgrof@do-not-panic.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1434751712-24333-1-git-send-email-mcgrof@do-not-panic.com> References: <1434751712-24333-1-git-send-email-mcgrof@do-not-panic.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: "Luis R. Rodriguez" This driver uses the same area for MTRR as for the ioremap(). 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() (see commit de33c442e titled "x86 PAT: fix performance drop for glx, use UC minus for ioremap(), ioremap_nocache() and pci_mmap_page_range()") 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: Jean-Christophe Plagniol-Villard Cc: Tomi Valkeinen Cc: Jingoo Han Cc: Geert Uytterhoeven Cc: Daniel Vetter Cc: "Lad, Prabhakar" Cc: Rickard Strandqvist Cc: Suresh Siddha Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Juergen Gross Cc: Andy Lutomirski Cc: Dave Airlie Cc: Antonino Daplas Cc: linux-fbdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Acked-by: Tomi Valkeinen Signed-off-by: Luis R. Rodriguez --- drivers/video/fbdev/s3fb.c | 35 ++++++----------------------------- 1 file changed, 6 insertions(+), 29 deletions(-) diff --git a/drivers/video/fbdev/s3fb.c b/drivers/video/fbdev/s3fb.c index f0ae61a..13b1090 100644 --- a/drivers/video/fbdev/s3fb.c +++ b/drivers/video/fbdev/s3fb.c @@ -28,13 +28,9 @@ #include #include -#ifdef CONFIG_MTRR -#include -#endif - struct s3fb_info { int chip, rev, mclk_freq; - int mtrr_reg; + int wc_cookie; struct vgastate state; struct mutex open_lock; unsigned int ref_count; @@ -154,11 +150,7 @@ static const struct svga_timing_regs s3_timing_regs = { static char *mode_option; - -#ifdef CONFIG_MTRR static int mtrr = 1; -#endif - static int fasttext = 1; @@ -170,11 +162,8 @@ module_param(mode_option, charp, 0444); MODULE_PARM_DESC(mode_option, "Default video mode ('640x480-8@60', etc)"); module_param_named(mode, mode_option, charp, 0444); MODULE_PARM_DESC(mode, "Default video mode ('640x480-8@60', etc) (deprecated)"); - -#ifdef CONFIG_MTRR module_param(mtrr, int, 0444); MODULE_PARM_DESC(mtrr, "Enable write-combining with MTRR (1=enable, 0=disable, default=1)"); -#endif module_param(fasttext, int, 0644); MODULE_PARM_DESC(fasttext, "Enable S3 fast text mode (1=enable, 0=disable, default=1)"); @@ -1168,7 +1157,7 @@ static int s3_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) info->fix.smem_len = pci_resource_len(dev, 0); /* Map physical IO memory address into kernel space */ - info->screen_base = pci_iomap(dev, 0, 0); + info->screen_base = pci_iomap_wc(dev, 0, 0); if (! info->screen_base) { rc = -ENOMEM; dev_err(info->device, "iomap for framebuffer failed\n"); @@ -1365,12 +1354,9 @@ static int s3_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) /* Record a reference to the driver data */ pci_set_drvdata(dev, info); -#ifdef CONFIG_MTRR - if (mtrr) { - par->mtrr_reg = -1; - par->mtrr_reg = mtrr_add(info->fix.smem_start, info->fix.smem_len, MTRR_TYPE_WRCOMB, 1); - } -#endif + if (mtrr) + par->wc_cookie = arch_phys_wc_add(info->fix.smem_start, + info->fix.smem_len); return 0; @@ -1405,14 +1391,7 @@ static void s3_pci_remove(struct pci_dev *dev) if (info) { par = info->par; - -#ifdef CONFIG_MTRR - if (par->mtrr_reg >= 0) { - mtrr_del(par->mtrr_reg, 0, 0); - par->mtrr_reg = -1; - } -#endif - + arch_phys_wc_del(par->wc_cookie); unregister_framebuffer(info); fb_dealloc_cmap(&info->cmap); @@ -1551,10 +1530,8 @@ static int __init s3fb_setup(char *options) if (!*opt) continue; -#ifdef CONFIG_MTRR else if (!strncmp(opt, "mtrr:", 5)) mtrr = simple_strtoul(opt + 5, NULL, 0); -#endif else if (!strncmp(opt, "fasttext:", 9)) fasttext = simple_strtoul(opt + 9, NULL, 0); else