diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2006-10-20 14:37:05 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-10-25 11:54:18 +1000 |
| commit | 859deea949c382d9ccb6397fe33df3703ecef45d (patch) | |
| tree | b0fe2d7a814143f3ff61a73a0727522a1a3dd6e4 /arch/powerpc/kernel | |
| parent | 21c4ff80cba5e24932f3ef79c8482c0491630b2b (diff) | |
[POWERPC] Cell timebase bug workaround
The Cell CPU timebase has an erratum. When reading the entire 64 bits
of the timebase with one mftb instruction, there is a handful of cycles
window during which one might read a value with the low order 32 bits
already reset to 0x00000000 but the high order bits not yet incremeted
by one. This fixes it by reading the timebase again until the low order
32 bits is no longer 0. That might introduce occasional latencies if
hitting mftb just at the wrong time, but no more than 70ns on a cell
blade, and that was considered acceptable.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/vdso64/gettimeofday.S | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/vdso64/gettimeofday.S b/arch/powerpc/kernel/vdso64/gettimeofday.S index 56e76ff5498..40ffd9b6cef 100644 --- a/arch/powerpc/kernel/vdso64/gettimeofday.S +++ b/arch/powerpc/kernel/vdso64/gettimeofday.S @@ -229,8 +229,10 @@ V_FUNCTION_BEGIN(__do_get_xsec) xor r0,r8,r8 /* create dependency */ add r3,r3,r0 - /* Get TB & offset it */ - mftb r7 + /* Get TB & offset it. We use the MFTB macro which will generate + * workaround code for Cell. + */ + MFTB(r7) ld r9,CFG_TB_ORIG_STAMP(r3) subf r7,r9,r7 |