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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-12-18 19:13:29 +0000
committerPaul Mackerras <paulus@samba.org>2008-12-21 14:21:15 +1100
commit2ca8cf738907180e7fbda90f25f32b86feda609f (patch)
tree60d8af9b53a78ae9300ef7e68f222b02fe3be542 /arch/powerpc/include/asm/tlbflush.h
parent5e696617c425eb97bd943d781f3941fb1e8f0e5b (diff)
powerpc/mm: Rework context management for CPUs with no hash table
This reworks the context management code used by 4xx,8xx and freescale BookE. It adds support for SMP by implementing a concept of stale context map to lazily flush the TLB on processors where a context may have been invalidated. This also contains the ground work for generalizing such lazy TLB flushing by just picking up a new PID and marking the old one stale. This will be implemented later. This is a first implementation that uses a global spinlock. Ideally, we should try to get at least the fast path (context ID already assigned) lockless or limited to a per context lock, but for now this will do. I tried to keep the UP case reasonably simple to avoid adding too much overhead to 8xx which does a lot of context stealing since it effectively has only 16 PIDs available. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/include/asm/tlbflush.h')
-rw-r--r--arch/powerpc/include/asm/tlbflush.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/tlbflush.h b/arch/powerpc/include/asm/tlbflush.h
index 333c24b5437..9ed363d3de4 100644
--- a/arch/powerpc/include/asm/tlbflush.h
+++ b/arch/powerpc/include/asm/tlbflush.h
@@ -29,6 +29,8 @@
#include <linux/mm.h>
+#define MMU_NO_CONTEXT ((unsigned int)-1)
+
extern void _tlbie(unsigned long address, unsigned int pid);
extern void _tlbil_all(void);
extern void _tlbil_pid(unsigned int pid);