Commit 39c29657fcf6060d71e04f1e52e5bb4b2999644f
Committed by
Linus Torvalds
Linus Torvalds
1 parent
d4c1465b7d
include/asm-:mips add missing edac h file
EDAC has a foundation to perform software memory scrubbing, but it requires a per architecture (atomic_scrub) function for performing an atomic update operation. Under X86, this is done with a lock: add [addr],0 in the file asm-x86/edac.h This patch provides the MIPS arch with that atomic function, atomic_scrub() in asm-mips/edac.h Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Doug Thompson <dougthompson@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Showing 1 changed file with 35 additions and 0 deletions Side-by-side Diff
include/asm-mips/edac.h
| 1 | +#ifndef ASM_EDAC_H | |
| 2 | +#define ASM_EDAC_H | |
| 3 | + | |
| 4 | +/* ECC atomic, DMA, SMP and interrupt safe scrub function */ | |
| 5 | + | |
| 6 | +static inline void atomic_scrub(void *va, u32 size) | |
| 7 | +{ | |
| 8 | + unsigned long *virt_addr = va; | |
| 9 | + unsigned long temp; | |
| 10 | + u32 i; | |
| 11 | + | |
| 12 | + for (i = 0; i < size / sizeof(unsigned long); i++, virt_addr++) { | |
| 13 | + | |
| 14 | + /* | |
| 15 | + * Very carefully read and write to memory atomically | |
| 16 | + * so we are interrupt, DMA and SMP safe. | |
| 17 | + * | |
| 18 | + * Intel: asm("lock; addl $0, %0"::"m"(*virt_addr)); | |
| 19 | + */ | |
| 20 | + | |
| 21 | + __asm__ __volatile__ ( | |
| 22 | + " .set mips3 \n" | |
| 23 | + "1: ll %0, %1 # atomic_add \n" | |
| 24 | + " ll %0, %1 # atomic_add \n" | |
| 25 | + " addu %0, $0 \n" | |
| 26 | + " sc %0, %1 \n" | |
| 27 | + " beqz %0, 1b \n" | |
| 28 | + " .set mips0 \n" | |
| 29 | + : "=&r" (temp), "=m" (*virt_addr) | |
| 30 | + : "m" (*virt_addr)); | |
| 31 | + | |
| 32 | + } | |
| 33 | +} | |
| 34 | + | |
| 35 | +#endif |