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Commit 8c58bf3e authored by Richard Weinberger's avatar Richard Weinberger Committed by Matt Fleming
Browse files

x86,efi: Implement efi_no_storage_paranoia parameter 



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: default avatarRichard Weinberger <richard@nod.at>
Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
parent 3668011d

Documentation/kernel-parameters.txt

+6 −0
Original line number Diff line number Diff line
@@ -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.

arch/x86/platform/efi/efi.c

+13 −1
Original line number Diff line number Diff line
@@ -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;