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Commit 80e75596 authored by Alex Thorlton's avatar Alex Thorlton Committed by Ingo Molnar
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efi: Convert efi_call_virt() to efi_call_virt_pointer() 



This commit makes a few slight modifications to the efi_call_virt() macro
to get it to work with function pointers that are stored in locations
other than efi.systab->runtime, and renames the macro to
efi_call_virt_pointer().  The majority of the changes here are to pull
these macros up into header files so that they can be accessed from
outside of drivers/firmware/efi/runtime-wrappers.c.

The most significant change not directly related to the code move is to
add an extra "p" argument into the appropriate efi_call macros, and use
that new argument in place of the, formerly hard-coded,
efi.systab->runtime pointer.

The last piece of the puzzle was to add an efi_call_virt() macro back into
drivers/firmware/efi/runtime-wrappers.c to wrap around the new
efi_call_virt_pointer() macro - this was mainly to keep the code from
looking too cluttered by adding a bunch of extra references to
efi.systab->runtime everywhere.

Note that I also broke up the code in the efi_call_virt_pointer() macro a
bit in the process of moving it.

Signed-off-by: default avatarAlex Thorlton <athorlton@sgi.com>
Signed-off-by: default avatarMatt Fleming <matt@codeblueprint.co.uk>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dimitri Sivanich <sivanich@sgi.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Roy Franz <roy.franz@linaro.org>
Cc: Russ Anderson <rja@sgi.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1466839230-12781-5-git-send-email-matt@codeblueprint.co.uk


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent f6d1747f

arch/arm/include/asm/efi.h

+2 −2
Original line number Diff line number Diff line
@@ -28,10 +28,10 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md); 
#define arch_efi_call_virt_setup()	efi_virtmap_load()

#define arch_efi_call_virt_teardown()	efi_virtmap_unload()



#define arch_efi_call_virt(f, args...)					\

#define arch_efi_call_virt(p, f, args...)				\

({									\

	efi_##f##_t *__f;						\

	__f = efi.systab->runtime->f;					\

	__f = p->f;							\

	__f(args);							\

})

arch/arm64/include/asm/efi.h

+2 −2
Original line number Diff line number Diff line
@@ -23,10 +23,10 @@ int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); 
	efi_virtmap_load();						\

})



#define arch_efi_call_virt(f, args...)					\

#define arch_efi_call_virt(p, f, args...)				\

({									\

	efi_##f##_t *__f;						\

	__f = efi.systab->runtime->f;					\

	__f = p->f;							\

	__f(args);							\

})

arch/x86/include/asm/efi.h

+4 −5
Original line number Diff line number Diff line
@@ -41,10 +41,9 @@ extern unsigned long asmlinkage efi_call_phys(void *, ...); 
/*

 * Wrap all the virtual calls in a way that forces the parameters on the stack.

 */

#define arch_efi_call_virt(f, args...)					\

#define arch_efi_call_virt(p, f, args...)				\

({									\

	((efi_##f##_t __attribute__((regparm(0)))*)			\

		efi.systab->runtime->f)(args);				\

	((efi_##f##_t __attribute__((regparm(0)))*) p->f)(args);	\

})



#define efi_ioremap(addr, size, type, attr)	ioremap_cache(addr, size)
@@ -81,8 +80,8 @@ struct efi_scratch { 
	}								\

})



#define arch_efi_call_virt(f, args...)					\

	efi_call((void *)efi.systab->runtime->f, args)			\

#define arch_efi_call_virt(p, f, args...)				\

	efi_call((void *)p->f, args)					\



#define arch_efi_call_virt_teardown()					\

({									\

drivers/firmware/efi/runtime-wrappers.c

+10 −43
Original line number Diff line number Diff line
@@ -22,7 +22,16 @@ 
#include <linux/stringify.h>

#include <asm/efi.h>



static void efi_call_virt_check_flags(unsigned long flags, const char *call)

/*

 * Wrap around the new efi_call_virt_generic() macros so that the

 * code doesn't get too cluttered:

 */

#define efi_call_virt(f, args...)   \

	efi_call_virt_pointer(efi.systab->runtime, f, args)

#define __efi_call_virt(f, args...) \

	__efi_call_virt_pointer(efi.systab->runtime, f, args)



void efi_call_virt_check_flags(unsigned long flags, const char *call)

{

	unsigned long cur_flags, mismatch;
@@ -38,48 +47,6 @@ static void efi_call_virt_check_flags(unsigned long flags, const char *call) 
	local_irq_restore(flags);

}



/*

 * Arch code can implement the following three template macros, avoiding

 * reptition for the void/non-void return cases of {__,}efi_call_virt:

 *

 *  * arch_efi_call_virt_setup

 *

 *    Sets up the environment for the call (e.g. switching page tables,

 *    allowing kernel-mode use of floating point, if required).

 *

 *  * arch_efi_call_virt

 *

 *    Performs the call. The last expression in the macro must be the call

 *    itself, allowing the logic to be shared by the void and non-void

 *    cases.

 *

 *  * arch_efi_call_virt_teardown

 *

 *    Restores the usual kernel environment once the call has returned.

 */



#define efi_call_virt(f, args...)					\

({									\

	efi_status_t __s;						\

	unsigned long flags;						\

	arch_efi_call_virt_setup();					\

	local_save_flags(flags);					\

	__s = arch_efi_call_virt(f, args);				\

	efi_call_virt_check_flags(flags, __stringify(f));		\

	arch_efi_call_virt_teardown();					\

	__s;								\

})



#define __efi_call_virt(f, args...)					\

({									\

	unsigned long flags;						\

	arch_efi_call_virt_setup();					\

	local_save_flags(flags);					\

	arch_efi_call_virt(f, args);					\

	efi_call_virt_check_flags(flags, __stringify(f));		\

	arch_efi_call_virt_teardown();					\

})



/*

 * According to section 7.1 of the UEFI spec, Runtime Services are not fully

 * reentrant, and there are particular combinations of calls that need to be

include/linux/efi.h

+51 −0
Original line number Diff line number Diff line
@@ -1480,4 +1480,55 @@ efi_status_t efi_setup_gop(efi_system_table_t *sys_table_arg, 
			   unsigned long size);



bool efi_runtime_disabled(void);

extern void efi_call_virt_check_flags(unsigned long flags, const char *call);



/*

 * Arch code can implement the following three template macros, avoiding

 * reptition for the void/non-void return cases of {__,}efi_call_virt():

 *

 *  * arch_efi_call_virt_setup()

 *

 *    Sets up the environment for the call (e.g. switching page tables,

 *    allowing kernel-mode use of floating point, if required).

 *

 *  * arch_efi_call_virt()

 *

 *    Performs the call. The last expression in the macro must be the call

 *    itself, allowing the logic to be shared by the void and non-void

 *    cases.

 *

 *  * arch_efi_call_virt_teardown()

 *

 *    Restores the usual kernel environment once the call has returned.

 */



#define efi_call_virt_pointer(p, f, args...)				\

({									\

	efi_status_t __s;						\

	unsigned long __flags;						\

									\

	arch_efi_call_virt_setup();					\

									\

	local_save_flags(__flags);					\

	__s = arch_efi_call_virt(p, f, args);				\

	efi_call_virt_check_flags(__flags, __stringify(f));		\

									\

	arch_efi_call_virt_teardown();					\

									\

	__s;								\

})



#define __efi_call_virt_pointer(p, f, args...)				\

({									\

	unsigned long __flags;						\

									\

	arch_efi_call_virt_setup();					\

									\

	local_save_flags(__flags);					\

	arch_efi_call_virt(p, f, args);					\

	efi_call_virt_check_flags(__flags, __stringify(f));		\

									\

	arch_efi_call_virt_teardown();					\

})



#endif /* _LINUX_EFI_H */