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efi: Convert efi_call_virt() to efi_call_virt_pointer()

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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: Alex Thorlton <athorlton@sgi.com>
Signed-off-by: Matt 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: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Alex Thorlton 2016-06-25 08:20:27 +01:00 committed by Ingo Molnar
parent f6d1747f89
commit 80e7559607
5 changed files with 69 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/include/asm/efi.h
View File

@ -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); \
})

4
arch/arm64/include/asm/efi.h
View File

@ -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); \
})

9
arch/x86/include/asm/efi.h
View File

@ -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() \
({ \

53
drivers/firmware/efi/runtime-wrappers.c
View File

@ -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

51
include/linux/efi.h
View File

@ -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 */