The old code allowed very strange memory types. Now it works like all the other video drivers: ioremap_wc is used unconditionally, and MTRRs are set if PAT is unavailable (unless MTRR is disabled by a module parameter).
UC, WB, and WT support is gone. If there are MTRR conflicts that prevent addition of a WC MTRR, adding a non-conflicting MTRR is pointless; it's better to just turn off MTRR support entirely.
As an added bonus, any MTRR added is freed on unload.
Signed-off-by: Andy Lutomirski luto@amacapital.net --- Documentation/fb/uvesafb.txt | 16 ++++------ drivers/video/uvesafb.c | 70 +++++++++++--------------------------------- include/video/uvesafb.h | 1 + 3 files changed, 23 insertions(+), 64 deletions(-)
diff --git a/Documentation/fb/uvesafb.txt b/Documentation/fb/uvesafb.txt index eefdd91..f6362d8 100644 --- a/Documentation/fb/uvesafb.txt +++ b/Documentation/fb/uvesafb.txt @@ -81,17 +81,11 @@ pmipal Use the protected mode interface for palette changes.
mtrr:n Setup memory type range registers for the framebuffer where n: - 0 - disabled (equivalent to nomtrr) (default) - 1 - uncachable - 2 - write-back - 3 - write-combining - 4 - write-through - - If you see the following in dmesg, choose the type that matches - the old one. In this example, use "mtrr:2". -... -mtrr: type mismatch for e0000000,8000000 old: write-back new: write-combining -... + 0 - disabled (equivalent to nomtrr) + 3 - write-combining (default) + + Values other than 0 and 3 will result in a warning and will be + treated just like 3.
nomtrr Do not use memory type range registers.
diff --git a/drivers/video/uvesafb.c b/drivers/video/uvesafb.c index d428445..8701f96 100644 --- a/drivers/video/uvesafb.c +++ b/drivers/video/uvesafb.c @@ -24,9 +24,6 @@ #ifdef CONFIG_X86 #include <video/vga.h> #endif -#ifdef CONFIG_MTRR -#include <asm/mtrr.h> -#endif #include "edid.h"
static struct cb_id uvesafb_cn_id = { @@ -1540,67 +1537,30 @@ static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
static void uvesafb_init_mtrr(struct fb_info *info) { -#ifdef CONFIG_MTRR + struct uvesafb_par *par = info->par; + if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) { int temp_size = info->fix.smem_len; - unsigned int type = 0;
- switch (mtrr) { - case 1: - type = MTRR_TYPE_UNCACHABLE; - break; - case 2: - type = MTRR_TYPE_WRBACK; - break; - case 3: - type = MTRR_TYPE_WRCOMB; - break; - case 4: - type = MTRR_TYPE_WRTHROUGH; - break; - default: - type = 0; - break; - } + int rc;
- if (type) { - int rc; + /* Find the largest power-of-two */ + temp_size = roundup_pow_of_two(temp_size);
- /* Find the largest power-of-two */ - temp_size = roundup_pow_of_two(temp_size); + /* Try and find a power of two to add */ + do { + rc = arch_phys_wc_add(info->fix.smem_start, temp_size); + temp_size >>= 1; + } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
- /* Try and find a power of two to add */ - do { - rc = mtrr_add(info->fix.smem_start, - temp_size, type, 1); - temp_size >>= 1; - } while (temp_size >= PAGE_SIZE && rc == -EINVAL); - } + if (rc >= 0) + par->mtrr_handle = rc; } -#endif /* CONFIG_MTRR */ }
static void uvesafb_ioremap(struct fb_info *info) { -#ifdef CONFIG_X86 - switch (mtrr) { - case 1: /* uncachable */ - info->screen_base = ioremap_nocache(info->fix.smem_start, info->fix.smem_len); - break; - case 2: /* write-back */ - info->screen_base = ioremap_cache(info->fix.smem_start, info->fix.smem_len); - break; - case 3: /* write-combining */ - info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len); - break; - case 4: /* write-through */ - default: - info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len); - break; - } -#else - info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len); -#endif /* CONFIG_X86 */ + info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len); }
static ssize_t uvesafb_show_vbe_ver(struct device *dev, @@ -1851,6 +1811,7 @@ static int uvesafb_remove(struct platform_device *dev) unregister_framebuffer(info); release_region(0x3c0, 32); iounmap(info->screen_base); + arch_phys_wc_del(par->mtrr_handle); release_mem_region(info->fix.smem_start, info->fix.smem_len); fb_destroy_modedb(info->monspecs.modedb); fb_dealloc_cmap(&info->cmap); @@ -1930,6 +1891,9 @@ static int uvesafb_setup(char *options) } }
+ if (mtrr != 3 && mtrr != 1) + pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr); + return 0; } #endif /* !MODULE */ diff --git a/include/video/uvesafb.h b/include/video/uvesafb.h index 1a91850..30f5362 100644 --- a/include/video/uvesafb.h +++ b/include/video/uvesafb.h @@ -134,6 +134,7 @@ struct uvesafb_par {
int mode_idx; struct vbe_crtc_ib crtc; + int mtrr_handle; };
#endif /* _UVESAFB_H */