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authorLuis R. Rodriguez <mcgrof@suse.com>2015-06-04 18:44:48 +0200
committerTomi Valkeinen <tomi.valkeinen@ti.com>2015-06-16 08:42:11 +0200
commit127b0c94cfa6e36c835adf6e27e056ff14818dc3 (patch)
treeaf5e19526fd3917424ab67a1a886b88a5c5e3004
parentvideo: fbdev: vesafb: add missing mtrr_del() for added MTRR (diff)
downloadlinux-127b0c94cfa6e36c835adf6e27e056ff14818dc3.tar.xz
linux-127b0c94cfa6e36c835adf6e27e056ff14818dc3.zip
video: fbdev: vesafb: use arch_phys_wc_add()
This driver uses the same area for MTRR as for the ioremap_wc(), if anything it just uses a smaller size in case MTRR reservation fails. ioremap_wc() API is already used to take advantage of architecture write-combining when available. 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. 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: Toshi Kani <toshi.kani@hp.com> Cc: Suresh Siddha <sbsiddha@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Juergen Gross <jgross@suse.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Dave Airlie <airlied@redhat.com> Cc: Antonino Daplas <adaplas@gmail.com> Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com> Cc: Rob Clark <robdclark@gmail.com> Cc: Jingoo Han <jg1.han@samsung.com> Cc: Wolfram Sang <wsa@the-dreams.de> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com> Cc: linux-fbdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
-rw-r--r--drivers/video/fbdev/vesafb.c29
1 files changed, 8 insertions, 21 deletions
diff --git a/drivers/video/fbdev/vesafb.c b/drivers/video/fbdev/vesafb.c
index 3db390885d71..528fe917dd49 100644
--- a/drivers/video/fbdev/vesafb.c
+++ b/drivers/video/fbdev/vesafb.c
@@ -19,10 +19,9 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/screen_info.h>
+#include <linux/io.h>
#include <video/vga.h>
-#include <asm/io.h>
-#include <asm/mtrr.h>
#define dac_reg (0x3c8)
#define dac_val (0x3c9)
@@ -180,16 +179,10 @@ static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
static void vesafb_destroy(struct fb_info *info)
{
-#ifdef CONFIG_MTRR
struct vesafb_par *par = info->par;
-#endif
fb_dealloc_cmap(&info->cmap);
-
-#ifdef CONFIG_MTRR
- if (par->wc_cookie >= 0)
- mtrr_del(par->wc_cookie, 0, 0);
-#endif
+ arch_phys_wc_del(par->wc_cookie);
if (info->screen_base)
iounmap(info->screen_base);
release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
@@ -420,7 +413,6 @@ static int vesafb_probe(struct platform_device *dev)
request_region(0x3c0, 32, "vesafb");
if (mtrr == 3) {
-#ifdef CONFIG_MTRR
unsigned int temp_size = size_total;
/* Find the largest power-of-two */
@@ -428,18 +420,16 @@ static int vesafb_probe(struct platform_device *dev)
/* Try and find a power of two to add */
do {
- par->wc_cookie = mtrr_add(vesafb_fix.smem_start,
- temp_size,
- MTRR_TYPE_WRCOMB, 1);
+ par->wc_cookie =
+ arch_phys_wc_add(vesafb_fix.smem_start,
+ temp_size);
temp_size >>= 1;
- } while (temp_size >= PAGE_SIZE && par->wc_cookie == -EINVAL);
-#endif
+ } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0);
+
info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
} else {
-#ifdef CONFIG_MTRR
if (mtrr && mtrr != 3)
WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n");
-#endif
info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
}
@@ -477,10 +467,7 @@ static int vesafb_probe(struct platform_device *dev)
fb_info(info, "%s frame buffer device\n", info->fix.id);
return 0;
err:
-#ifdef CONFIG_MTRR
- if (par->wc_cookie >= 0)
- mtrr_del(par->wc_cookie, 0, 0);
-#endif
+ arch_phys_wc_del(par->wc_cookie);
if (info->screen_base)
iounmap(info->screen_base);
framebuffer_release(info);