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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2006-01-18 17:44:07 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-18 19:20:30 -0800
commit715b49ef2de6fcead0776d9349071670282faf65 (patch)
treed09b77c804aba3b191dc0ceb294387cf730ede4b
parent3213e913b0d6baeb28aa1affbdd4bfa7efedc35f (diff)
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[PATCH] EDAC: atomic scrub operations
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>
-rw-r--r--drivers/md/kcopyd.c1
-rw-r--r--fs/nfsctl.c1
-rw-r--r--include/asm-i386/atomic.h12
-rw-r--r--include/asm-x86_64/atomic.h12
-rw-r--r--kernel/audit.c2
-rw-r--r--kernel/auditsc.c2
-rw-r--r--net/ipv4/raw.c2
7 files changed, 29 insertions, 3 deletions
diff --git a/drivers/md/kcopyd.c b/drivers/md/kcopyd.c
index ca99979c868..8b3515f394a 100644
--- a/drivers/md/kcopyd.c
+++ b/drivers/md/kcopyd.c
@@ -8,6 +8,7 @@
* completion notification.
*/
+#include <asm/types.h>
#include <asm/atomic.h>
#include <linux/blkdev.h>
diff --git a/fs/nfsctl.c b/fs/nfsctl.c
index 0b14938b5b6..0d4cf948606 100644
--- a/fs/nfsctl.c
+++ b/fs/nfsctl.c
@@ -5,6 +5,7 @@
*
*/
#include <linux/config.h>
+#include <linux/types.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/sunrpc/svc.h>
diff --git a/include/asm-i386/atomic.h b/include/asm-i386/atomic.h
index de649d3aa2d..e2c00c95a5e 100644
--- a/include/asm-i386/atomic.h
+++ b/include/asm-i386/atomic.h
@@ -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
diff --git a/include/asm-x86_64/atomic.h b/include/asm-x86_64/atomic.h
index 4b5cd553e77..4048508c4f4 100644
--- a/include/asm-x86_64/atomic.h
+++ b/include/asm-x86_64/atomic.h
@@ -426,5 +426,17 @@ __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(u32 *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
diff --git a/kernel/audit.c b/kernel/audit.c
index d13ab7d2d89..0a813d2883e 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -42,8 +42,8 @@
*/
#include <linux/init.h>
-#include <asm/atomic.h>
#include <asm/types.h>
+#include <asm/atomic.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/err.h>
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index d8a68509e72..685c25175d9 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -30,8 +30,8 @@
*/
#include <linux/init.h>
-#include <asm/atomic.h>
#include <asm/types.h>
+#include <asm/atomic.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mount.h>
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 165a4d81efa..f29a12da510 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -40,12 +40,12 @@
*/
#include <linux/config.h>
+#include <linux/types.h>
#include <asm/atomic.h>
#include <asm/byteorder.h>
#include <asm/current.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
-#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/errno.h>