ARM: bugs: add support for per-processor bug checking (9d3a0492) · Commits · 戴 / test

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:

Russell King <rmk+kernel@armlinux.org.uk> Reviewed-by:

Florian Fainelli <f.fainelli@gmail.com> Boot-tested-by:

Tony Lindgren <tony@atomide.com> Reviewed-by:

Tony Lindgren <tony@atomide.com> Acked-by:

Marc Zyngier <marc.zyngier@arm.com>

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

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