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

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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>
This commit is contained in:
Russell King 2018-05-10 13:07:29 +01:00
parent 26602161b5
commit 9d3a04925d
3 changed files with 10 additions and 1 deletions
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4
arch/arm/include/asm/proc-fns.h
View File

@ -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
*/

4
arch/arm/kernel/bugs.c
View File

@ -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)

3
arch/arm/mm/proc-macros.S
View File

@ -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