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author | David S. Miller <davem@davemloft.net> | 2010-02-17 06:09:29 (GMT) |
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committer | David S. Miller <davem@davemloft.net> | 2010-02-17 06:09:29 (GMT) |
commit | 2bb4646fce8d09916b351d1a62f98db7cec6fc41 (patch) | |
tree | c1f0d002e69868606eca9d1b919835f422892063 /arch/x86/kernel/uv_time.c | |
parent | 6836b9bdd98e3b500cd49512484df68f46e14659 (diff) | |
parent | b0483e78e5c4c9871fc5541875b3bc006846d46b (diff) | |
download | linux-fsl-qoriq-2bb4646fce8d09916b351d1a62f98db7cec6fc41.tar.xz |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Diffstat (limited to 'arch/x86/kernel/uv_time.c')
-rw-r--r-- | arch/x86/kernel/uv_time.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/x86/kernel/uv_time.c b/arch/x86/kernel/uv_time.c index 3c84aa0..2b75ef63 100644 --- a/arch/x86/kernel/uv_time.c +++ b/arch/x86/kernel/uv_time.c @@ -282,10 +282,21 @@ static int uv_rtc_unset_timer(int cpu, int force) /* * Read the RTC. + * + * Starting with HUB rev 2.0, the UV RTC register is replicated across all + * cachelines of it's own page. This allows faster simultaneous reads + * from a given socket. */ static cycle_t uv_read_rtc(struct clocksource *cs) { - return (cycle_t)uv_read_local_mmr(UVH_RTC); + unsigned long offset; + + if (uv_get_min_hub_revision_id() == 1) + offset = 0; + else + offset = (uv_blade_processor_id() * L1_CACHE_BYTES) % PAGE_SIZE; + + return (cycle_t)uv_read_local_mmr(UVH_RTC | offset); } /* |