Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 0d5360ee authored by Russell King's avatar Russell King Committed by Greg Kroah-Hartman
Browse files

ARM: bugs: add support for per-processor bug checking 



Commit 9d3a04925deeabb97c8e26d940b501a2873e8af3 upstream.

Add support for per-processor bug checking - each processor function
descriptor gains a function pointer for this check, which must not be
an __init function.  If non-NULL, this will be called whenever a CPU
enters the kernel via which ever path (boot CPU, secondary CPU startup,
CPU resuming, etc.)

This allows processor specific bug checks to validate that workaround
bits are properly enabled by firmware via all entry paths to the kernel.

Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Boot-tested-by: default avatarTony Lindgren <tony@atomide.com>
Reviewed-by: default avatarTony Lindgren <tony@atomide.com>
Acked-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarDavid A. Long <dave.long@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c7825c27

arch/arm/include/asm/proc-fns.h

+4 −0
Original line number Diff line number Diff line
@@ -36,6 +36,10 @@ extern struct processor { 
	 * Set up any processor specifics

	 */

	void (*_proc_init)(void);

	/*

	 * Check for processor bugs

	 */

	void (*check_bugs)(void);

	/*

	 * Disable any processor specifics

	 */

arch/arm/kernel/bugs.c

+4 −0
Original line number Diff line number Diff line
@@ -5,6 +5,10 @@ 


void check_other_bugs(void)

{

#ifdef MULTI_CPU

	if (processor.check_bugs)

		processor.check_bugs();

#endif

}



void __init check_bugs(void)

arch/arm/mm/proc-macros.S

+2 −1
Original line number Diff line number Diff line
@@ -273,13 +273,14 @@ 
	mcr	p15, 0, ip, c7, c10, 4		@ data write barrier

	.endm



.macro define_processor_functions name:req, dabort:req, pabort:req, nommu=0, suspend=0

.macro define_processor_functions name:req, dabort:req, pabort:req, nommu=0, suspend=0, bugs=0

	.type	\name\()_processor_functions, #object

	.align 2

ENTRY(\name\()_processor_functions)

	.word	\dabort

	.word	\pabort

	.word	cpu_\name\()_proc_init

	.word	\bugs

	.word	cpu_\name\()_proc_fin

	.word	cpu_\name\()_reset

	.word	cpu_\name\()_do_idle