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* Fix earlyprintk=efi,keep support by switching to an ioremap() mapping

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of the framebuffer when early_ioremap() is no longer available and
    dropping __init from functions that may be invoked after
    free_initmem() - Dave Young
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Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/urgent

Pull EFI fix from Matt Fleming:

" * Fix earlyprintk=efi,keep support by switching to an ioremap() mapping
    of the framebuffer when early_ioremap() is no longer available and
    dropping __init from functions that may be invoked after
    free_initmem() - Dave Young "

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2014-05-04 20:20:42 +02:00
commit 0214196ce0
1 changed files with 64 additions and 19 deletions
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83
arch/x86/platform/efi/early_printk.c
View File

@ -14,48 +14,92 @@
static const struct font_desc *font;
static u32 efi_x, efi_y;
static void *efi_fb;
static bool early_efi_keep;
static __init void early_efi_clear_scanline(unsigned int y)
/*
* efi earlyprintk need use early_ioremap to map the framebuffer.
* But early_ioremap is not usable for earlyprintk=efi,keep, ioremap should
* be used instead. ioremap will be available after paging_init() which is
* earlier than initcall callbacks. Thus adding this early initcall function
* early_efi_map_fb to map the whole efi framebuffer.
*/
static __init int early_efi_map_fb(void)
{
unsigned long base, *dst;
u16 len;
unsigned long base, size;
if (!early_efi_keep)
return 0;
base = boot_params.screen_info.lfb_base;
len = boot_params.screen_info.lfb_linelength;
size = boot_params.screen_info.lfb_size;
efi_fb = ioremap(base, size);
dst = early_ioremap(base + y*len, len);
return efi_fb ? 0 : -ENOMEM;
}
early_initcall(early_efi_map_fb);
/*
* early_efi_map maps efi framebuffer region [start, start + len -1]
* In case earlyprintk=efi,keep we have the whole framebuffer mapped already
* so just return the offset efi_fb + start.
*/
static __init_refok void *early_efi_map(unsigned long start, unsigned long len)
{
unsigned long base;
base = boot_params.screen_info.lfb_base;
if (efi_fb)
return (efi_fb + start);
else
return early_ioremap(base + start, len);
}
static __init_refok void early_efi_unmap(void *addr, unsigned long len)
{
if (!efi_fb)
early_iounmap(addr, len);
}
static void early_efi_clear_scanline(unsigned int y)
{
unsigned long *dst;
u16 len;
len = boot_params.screen_info.lfb_linelength;
dst = early_efi_map(y*len, len);
if (!dst)
return;
memset(dst, 0, len);
early_iounmap(dst, len);
early_efi_unmap(dst, len);
}
static __init void early_efi_scroll_up(void)
static void early_efi_scroll_up(void)
{
unsigned long base, *dst, *src;
unsigned long *dst, *src;
u16 len;
u32 i, height;
base = boot_params.screen_info.lfb_base;
len = boot_params.screen_info.lfb_linelength;
height = boot_params.screen_info.lfb_height;
for (i = 0; i < height - font->height; i++) {
dst = early_ioremap(base + i*len, len);
dst = early_efi_map(i*len, len);
if (!dst)
return;
src = early_ioremap(base + (i + font->height) * len, len);
src = early_efi_map((i + font->height) * len, len);
if (!src) {
early_iounmap(dst, len);
early_efi_unmap(dst, len);
return;
}
memmove(dst, src, len);
early_iounmap(src, len);
early_iounmap(dst, len);
early_efi_unmap(src, len);
early_efi_unmap(dst, len);
}
}
@ -79,16 +123,14 @@ static void early_efi_write_char(u32 *dst, unsigned char c, unsigned int h)
}
}
static __init void
static void
early_efi_write(struct console *con, const char *str, unsigned int num)
{
struct screen_info *si;
unsigned long base;
unsigned int len;
const char *s;
void *dst;
base = boot_params.screen_info.lfb_base;
si = &boot_params.screen_info;
len = si->lfb_linelength;
@ -109,7 +151,7 @@ early_efi_write(struct console *con, const char *str, unsigned int num)
for (h = 0; h < font->height; h++) {
unsigned int n, x;
dst = early_ioremap(base + (efi_y + h) * len, len);
dst = early_efi_map((efi_y + h) * len, len);
if (!dst)
return;
@ -123,7 +165,7 @@ early_efi_write(struct console *con, const char *str, unsigned int num)
s++;
}
early_iounmap(dst, len);
early_efi_unmap(dst, len);
}
num -= count;
@ -179,6 +221,9 @@ static __init int early_efi_setup(struct console *con, char *options)
for (i = 0; i < (yres - efi_y) / font->height; i++)
early_efi_scroll_up();
/* early_console_register will unset CON_BOOT in case ,keep */
if (!(con->flags & CON_BOOT))
early_efi_keep = true;
return 0;
}