video: fbdev: pm2fb: use arch_phys_wc_add() and ioremap_wc()

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: Rob Clark <robdclark@gmail.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
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: 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: 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>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/video/fbdev/pm2fb.c b/drivers/video/fbdev/pm2fb.c
index 3b85b647bc10f97e004974ab37f360c63d50ba2d..aa8d28880912dc571cdfe7763a8edd2223a28065 100644 (file)
--- a/drivers/video/fbdev/pm2fb.c
+++ b/drivers/video/fbdev/pm2fb.c
@@ -38,10 +38,6 @@
 #include <linux/fb.h>
 #include <linux/init.h>
 #include <linux/pci.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
-
 #include <video/permedia2.h>
 #include <video/cvisionppc.h>
 
@@ -81,10 +77,7 @@ static char *mode_option;
 static bool lowhsync;
 static bool lowvsync;
 static bool noaccel;
-/* mtrr option */
-#ifdef CONFIG_MTRR
 static bool nomtrr;
-#endif
 
 /*
  * The hardware state of the graphics card that isn't part of the
@@ -100,7 +93,7 @@ struct pm2fb_par
        u32             mem_control;    /* MemControl reg at probe */
        u32             boot_address;   /* BootAddress reg at probe */
        u32             palette[16];
-       int             mtrr_handle;
+       int             wc_cookie;
 };
 
 /*
@@ -1637,21 +1630,16 @@ static int pm2fb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
                goto err_exit_mmio;
        }
        info->screen_base =
-               ioremap_nocache(pm2fb_fix.smem_start, pm2fb_fix.smem_len);
+               ioremap_wc(pm2fb_fix.smem_start, pm2fb_fix.smem_len);
        if (!info->screen_base) {
                printk(KERN_WARNING "pm2fb: Can't ioremap smem area.\n");
                release_mem_region(pm2fb_fix.smem_start, pm2fb_fix.smem_len);
                goto err_exit_mmio;
        }
 
-#ifdef CONFIG_MTRR
-       default_par->mtrr_handle = -1;
        if (!nomtrr)
-               default_par->mtrr_handle =
-                       mtrr_add(pm2fb_fix.smem_start,
-                                pm2fb_fix.smem_len,
-                                MTRR_TYPE_WRCOMB, 1);
-#endif
+               default_par->wc_cookie = arch_phys_wc_add(pm2fb_fix.smem_start,
+                                                         pm2fb_fix.smem_len);
 
        info->fbops             = &pm2fb_ops;
        info->fix               = pm2fb_fix;
@@ -1733,12 +1721,7 @@ static void pm2fb_remove(struct pci_dev *pdev)
        struct pm2fb_par *par = info->par;
 
        unregister_framebuffer(info);
-
-#ifdef CONFIG_MTRR
-       if (par->mtrr_handle >= 0)
-               mtrr_del(par->mtrr_handle, info->fix.smem_start,
-                        info->fix.smem_len);
-#endif /* CONFIG_MTRR */
+       arch_phys_wc_del(par->wc_cookie);
        iounmap(info->screen_base);
        release_mem_region(fix->smem_start, fix->smem_len);
        iounmap(par->v_regs);
@@ -1791,10 +1774,8 @@ static int __init pm2fb_setup(char *options)
                        lowvsync = 1;
                else if (!strncmp(this_opt, "hwcursor=", 9))
                        hwcursor = simple_strtoul(this_opt + 9, NULL, 0);
-#ifdef CONFIG_MTRR
                else if (!strncmp(this_opt, "nomtrr", 6))
                        nomtrr = 1;
-#endif
                else if (!strncmp(this_opt, "noaccel", 7))
                        noaccel = 1;
                else
@@ -1847,10 +1828,8 @@ MODULE_PARM_DESC(noaccel, "Disable acceleration");
 module_param(hwcursor, int, 0644);
 MODULE_PARM_DESC(hwcursor, "Enable hardware cursor "
                        "(1=enable, 0=disable, default=1)");
-#ifdef CONFIG_MTRR
 module_param(nomtrr, bool, 0);
 MODULE_PARM_DESC(nomtrr, "Disable MTRR support (0 or 1=disabled) (default=0)");
-#endif
 
 MODULE_AUTHOR("Jim Hague <jim.hague@acm.org>");
 MODULE_DESCRIPTION("Permedia2 framebuffer device driver");