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Date: Mon, 24 Aug 2015 12:13:28 -0700
From: "Luis R. Rodriguez" <mcgrof@...not-panic.com>
To: mingo@...nel.org
Cc: bp@...e.de, bhelgaas@...gle.com, tomi.valkeinen@...com,
airlied@...ux.ie, linux-fbdev@...r.kernel.org, luto@...capital.net,
vinod.koul@...el.com, dan.j.williams@...el.com, toshi.kani@...com,
benh@...nel.crashing.org, mst@...hat.com,
akpm@...ux-foundation.org, daniel.vetter@...ll.ch,
konrad.wilk@...cle.com, x86@...nel.org,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
xen-devel@...ts.xensource.com,
"Luis R. Rodriguez" <mcgrof@...e.com>,
Antonino Daplas <adaplas@...il.com>,
Arnd Bergmann <arnd@...db.de>,
Dave Airlie <airlied@...hat.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
"H. Peter Anvin" <hpa@...or.com>,
Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
Juergen Gross <jgross@...e.com>,
"Lad, Prabhakar" <prabhakar.csengg@...il.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Suresh Siddha <sbsiddha@...il.com>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v4 06/11] drivers/video/fbdev/arkfb.c: Use arch_phys_wc_add() and pci_iomap_wc()
From: "Luis R. Rodriguez" <mcgrof@...e.com>
Convert the driver from using the x86-specific MTRR code to the
architecture-agnostic arch_phys_wc_add(). It will avoid MTRRs if
write-combining is available. In order to take advantage of that also
ensure the ioremapped 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 it is being 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 ifdeffery 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);
Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
Acked-by: Tomi Valkeinen <tomi.valkeinen@...com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Antonino Daplas <adaplas@...il.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: benh@...nel.crashing.org
Cc: bhelgaas@...gle.com
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Dave Airlie <airlied@...hat.com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Cc: Juergen Gross <jgross@...e.com>
Cc: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: linux-fbdev@...r.kernel.org
Cc: linux-pci@...r.kernel.org
Cc: mst@...hat.com
Cc: Suresh Siddha <sbsiddha@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: toshi.kani@...com
Link: http://lkml.kernel.org/r/1435195342-26879-8-git-send-email-mcgrof@do-not-panic.com
Signed-off-by: Borislav Petkov <bp@...e.de>
---
drivers/video/fbdev/arkfb.c | 36 +++++-------------------------------
1 file changed, 5 insertions(+), 31 deletions(-)
diff --git a/drivers/video/fbdev/arkfb.c b/drivers/video/fbdev/arkfb.c
index b305a1e7cc76..6a317de7082c 100644
--- a/drivers/video/fbdev/arkfb.c
+++ b/drivers/video/fbdev/arkfb.c
@@ -26,13 +26,9 @@
#include <linux/console.h> /* Why should fb driver call console functions? because console_lock() */
#include <video/vga.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
struct arkfb_info {
int mclk_freq;
- int mtrr_reg;
+ int wc_cookie;
struct dac_info *dac;
struct vgastate state;
@@ -102,10 +98,6 @@ static const struct svga_timing_regs ark_timing_regs = {
static char *mode_option = "640x480-8@60";
-#ifdef CONFIG_MTRR
-static int mtrr = 1;
-#endif
-
MODULE_AUTHOR("(c) 2007 Ondrej Zajicek <santiago@...reenet.org>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("fbdev driver for ARK 2000PV");
@@ -115,11 +107,6 @@ 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
-
static int threshold = 4;
module_param(threshold, int, 0644);
@@ -1002,7 +989,7 @@ static int ark_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");
@@ -1057,14 +1044,8 @@ static int ark_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
-
+ par->wc_cookie = arch_phys_wc_add(info->fix.smem_start,
+ info->fix.smem_len);
return 0;
/* Error handling */
@@ -1092,14 +1073,7 @@ static void ark_pci_remove(struct pci_dev *dev)
if (info) {
struct arkfb_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);
dac_release(par->dac);
unregister_framebuffer(info);
fb_dealloc_cmap(&info->cmap);
--
2.4.3
--
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