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

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>

diff --git a/arch/arm/include/asm/proc-fns.h b/arch/arm/include/asm/proc-fns.h
index f2e1af4..e25f439 100644 (file)
--- a/arch/arm/include/asm/proc-fns.h
+++ b/arch/arm/include/asm/proc-fns.h
@@ -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
         */

diff --git a/arch/arm/kernel/bugs.c b/arch/arm/kernel/bugs.c
index 16e7ba2..7be5113 100644 (file)
--- a/arch/arm/kernel/bugs.c
+++ b/arch/arm/kernel/bugs.c
@@ -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)

diff --git a/arch/arm/mm/proc-macros.S b/arch/arm/mm/proc-macros.S
index f10e31d..81d0efb 100644 (file)
--- a/arch/arm/mm/proc-macros.S
+++ b/arch/arm/mm/proc-macros.S
@@ -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