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[PATCH] EDAC: atomic scrub operations

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EDAC requires a way to scrub memory if an ECC error is found and the chipset
does not do the work automatically.  That means rewriting memory locations
atomically with respect to all CPUs _and_ bus masters.  That means we can't
use atomic_add(foo, 0) as it gets optimised for non-SMP

This adds a function to include/asm-foo/atomic.h for the platforms currently
supported which implements a scrub of a mapped block.

It also adjusts a few other files include order where atomic.h is included
before types.h as this now causes an error as atomic_scrub uses u32.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Alan Cox
2006-01-18 17:44:07 -08:00
committed by Linus Torvalds
parent 3213e913b0
commit 715b49ef2d
7 changed files with 29 additions and 3 deletions
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include/asm-i386/atomic.h
+12
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@@ -255,5 +255,17 @@ __asm__ __volatile__(LOCK "orl %0,%1" \
#define smp_mb__before_atomic_inc() barrier()
#define smp_mb__after_atomic_inc() barrier()
/* ECC atomic, DMA, SMP and interrupt safe scrub function */
static __inline__ void atomic_scrub(unsigned long *virt_addr, u32 size)
{
u32 i;
for (i = 0; i < size / 4; i++, virt_addr++)
/* Very carefully read and write to memory atomically
* so we are interrupt, DMA and SMP safe.
*/
__asm__ __volatile__("lock; addl $0, %0"::"m"(*virt_addr));
}
#include <asm-generic/atomic.h>
#endif