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x86/efi: Add a "debug" option to the efi= cmdline

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... and hide the memory regions dump behind it. Make it default-off.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/20141209095843.GA3990@pd.tnic
Acked-by: Laszlo Ersek <lersek@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Borislav Petkov 2015-02-05 11:44:41 +01:00 • committed by Matt Fleming
parent 552e19d876
commit fed6cefe3b
3 changed files with 7 additions and 2 deletions
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3
Documentation/kernel-parameters.txt
View file

@ -1036,7 +1036,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
Format: {"off" | "on" | "skip[mbr]"} Format: {"off" | "on" | "skip[mbr]"}
efi= [EFI] efi= [EFI]
Format: { "old_map", "nochunk", "noruntime" } Format: { "old_map", "nochunk", "noruntime", "debug" }
old_map [X86-64]: switch to the old ioremap-based EFI old_map [X86-64]: switch to the old ioremap-based EFI
runtime services mapping. 32-bit still uses this one by runtime services mapping. 32-bit still uses this one by
default. default.
@ -1044,6 +1044,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
boot stub, as chunking can cause problems with some boot stub, as chunking can cause problems with some
firmware implementations. firmware implementations.
noruntime : disable EFI runtime services support noruntime : disable EFI runtime services support
debug: enable misc debug output
efi_no_storage_paranoia [EFI; X86] efi_no_storage_paranoia [EFI; X86]
Using this parameter you can use more than 50% of Using this parameter you can use more than 50% of

5
arch/x86/platform/efi/efi.c
View file

@ -491,7 +491,8 @@ void __init efi_init(void)
if (efi_memmap_init()) if (efi_memmap_init())
return; return;
print_efi_memmap(); if (efi_enabled(EFI_DBG))
print_efi_memmap();
} }
void __init efi_late_init(void) void __init efi_late_init(void)
@ -939,6 +940,8 @@ static int __init arch_parse_efi_cmdline(char *str)
{ {
if (parse_option_str(str, "old_map")) if (parse_option_str(str, "old_map"))
set_bit(EFI_OLD_MEMMAP, &efi.flags); set_bit(EFI_OLD_MEMMAP, &efi.flags);
if (parse_option_str(str, "debug"))
set_bit(EFI_DBG, &efi.flags);
return 0; return 0;
} }

1
include/linux/efi.h
View file

@ -942,6 +942,7 @@ extern int __init efi_setup_pcdp_console(char *);
#define EFI_64BIT 5 /* Is the firmware 64-bit? */ #define EFI_64BIT 5 /* Is the firmware 64-bit? */
#define EFI_PARAVIRT 6 /* Access is via a paravirt interface */ #define EFI_PARAVIRT 6 /* Access is via a paravirt interface */
#define EFI_ARCH_1 7 /* First arch-specific bit */ #define EFI_ARCH_1 7 /* First arch-specific bit */
#define EFI_DBG 8 /* Print additional debug info at runtime */
#ifdef CONFIG_EFI #ifdef CONFIG_EFI
/* /*