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arm: Disable outer (L2) cache in kexec 

kexec does not disable the outer cache before disabling the inner
caches in cpu_proc_fin(). So L2 is enabled across the kexec jump. When
the new kernel enables chaches again, it randomly crashes.

Disabling L2 before calling cpu_proc_fin() cures the problem.

Disabling L2 requires the following new functions: flush_all(),
inv_all() and disable(). Add them to outer_cache_fns and call them
from the kexec code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
This commit is contained in:
Thomas Gleixner 2010-07-31 21:06:06 +05:30 committed by Santosh Shilimkar
parent 9a6655e49f
commit ae360a78f4
2 changed files with 27 additions and 0 deletions
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24
arch/arm/include/asm/outercache.h
View File

@ -25,6 +25,9 @@ struct outer_cache_fns {
void (*inv_range)(unsigned long, unsigned long);
void (*clean_range)(unsigned long, unsigned long);
void (*flush_range)(unsigned long, unsigned long);
void (*flush_all)(void);
void (*inv_all)(void);
void (*disable)(void);
#ifdef CONFIG_OUTER_CACHE_SYNC
void (*sync)(void);
#endif
@ -50,6 +53,24 @@ static inline void outer_flush_range(unsigned long start, unsigned long end)
outer_cache.flush_range(start, end);
}
static inline void outer_flush_all(void)
{
if (outer_cache.flush_all)
outer_cache.flush_all();
}
static inline void outer_inv_all(void)
{
if (outer_cache.inv_all)
outer_cache.inv_all();
}
static inline void outer_disable(void)
{
if (outer_cache.disable)
outer_cache.disable();
}
#else
static inline void outer_inv_range(unsigned long start, unsigned long end)
@ -58,6 +79,9 @@ static inline void outer_clean_range(unsigned long start, unsigned long end)
{ }
static inline void outer_flush_range(unsigned long start, unsigned long end)
{ }
static inline void outer_flush_all(void) { }
static inline void outer_inv_all(void) { }
static inline void outer_disable(void) { }
#endif

3
arch/arm/kernel/machine_kexec.c
View File

@ -78,7 +78,10 @@ void machine_kexec(struct kimage *image)
local_fiq_disable();
setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/
flush_cache_all();
outer_flush_all();
outer_disable();
cpu_proc_fin();
outer_inv_all();
flush_cache_all();
cpu_reset(reboot_code_buffer_phys);
}