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x86,efi: Implement efi_no_storage_paranoia parameter

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Using this parameter one can disable the storage_size/2 check if
he is really sure that the UEFI does sane gc and fulfills the spec.

This parameter is useful if a devices uses more than 50% of the
storage by default.
The Intel DQSW67 desktop board is such a sucker for exmaple.

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Richard Weinberger 2013-04-17 01:00:53 +02:00 committed by Matt Fleming
parent 3668011d4a
commit 8c58bf3eec
2 changed files with 19 additions and 1 deletions
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6
Documentation/kernel-parameters.txt
View file

@ -788,6 +788,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
edd= [EDD]
Format: {"off" | "on" | "skip[mbr]"}
efi_no_storage_paranoia [EFI; X86]
Using this parameter you can use more than 50% of
your efi variable storage. Use this parameter only if
you are really sure that your UEFI does sane gc and
fulfills the spec otherwise your board may brick.
eisa_irq_edge= [PARISC,HW]
See header of drivers/parisc/eisa.c.

14
arch/x86/platform/efi/efi.c
View file

@ -113,6 +113,15 @@ static int __init setup_add_efi_memmap(char *arg)
}
early_param("add_efi_memmap", setup_add_efi_memmap);
static bool efi_no_storage_paranoia;
static int __init setup_storage_paranoia(char *arg)
{
efi_no_storage_paranoia = true;
return 0;
}
early_param("efi_no_storage_paranoia", setup_storage_paranoia);
static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
@ -1137,7 +1146,10 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
*/
if (!storage_size || size > remaining_size ||
(max_size && size > max_size) ||
(max_size && size > max_size))
return EFI_OUT_OF_RESOURCES;
if (!efi_no_storage_paranoia &&
((active_size + size + VAR_METADATA_SIZE > storage_size / 2) &&
(remaining_size - size < storage_size / 2)))
return EFI_OUT_OF_RESOURCES;