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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2006-10-20 00:37:05 -0400
committerPaul Mackerras <paulus@samba.org>2006-10-24 21:54:18 -0400
commit859deea949c382d9ccb6397fe33df3703ecef45d (patch)
treeb0fe2d7a814143f3ff61a73a0727522a1a3dd6e4 /arch/powerpc/kernel
parent21c4ff80cba5e24932f3ef79c8482c0491630b2b (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.S6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/vdso64/gettimeofday.S b/arch/powerpc/kernel/vdso64/gettimeofday.S
index 56e76ff5498f..40ffd9b6cef7 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)
229 xor r0,r8,r8 /* create dependency */ 229 xor r0,r8,r8 /* create dependency */
230 add r3,r3,r0 230 add r3,r3,r0
231 231
232 /* Get TB & offset it */ 232 /* Get TB & offset it. We use the MFTB macro which will generate
233 mftb r7 233 * workaround code for Cell.
234 */
235 MFTB(r7)
234 ld r9,CFG_TB_ORIG_STAMP(r3) 236 ld r9,CFG_TB_ORIG_STAMP(r3)
235 subf r7,r9,r7 237 subf r7,r9,r7
236 238