Commit 011af857 authored by Joerg Roedel's avatar Joerg Roedel Committed by Ingo Molnar

perf, amd: Use GO/HO bits in perf-ctr

The AMD perf-counters support counting in guest or host-mode
only. Make use of that feature when user-space specified
guest/host-mode only counting.
Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1317816084-18026-3-git-send-email-gleb@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent a240f761
......@@ -29,6 +29,9 @@
#define ARCH_PERFMON_EVENTSEL_INV (1ULL << 23)
#define ARCH_PERFMON_EVENTSEL_CMASK 0xFF000000ULL
#define AMD_PERFMON_EVENTSEL_GUESTONLY (1ULL << 40)
#define AMD_PERFMON_EVENTSEL_HOSTONLY (1ULL << 41)
#define AMD64_EVENTSEL_EVENT \
(ARCH_PERFMON_EVENTSEL_EVENT | (0x0FULL << 32))
#define INTEL_ARCH_EVENT_MASK \
......
......@@ -138,6 +138,19 @@ static int amd_pmu_hw_config(struct perf_event *event)
if (ret)
return ret;
if (event->attr.exclude_host && event->attr.exclude_guest)
/*
* When HO == GO == 1 the hardware treats that as GO == HO == 0
* and will count in both modes. We don't want to count in that
* case so we emulate no-counting by setting US = OS = 0.
*/
event->hw.config &= ~(ARCH_PERFMON_EVENTSEL_USR |
ARCH_PERFMON_EVENTSEL_OS);
else if (event->attr.exclude_host)
event->hw.config |= AMD_PERFMON_EVENTSEL_GUESTONLY;
else if (event->attr.exclude_guest)
event->hw.config |= AMD_PERFMON_EVENTSEL_HOSTONLY;
if (event->attr.type != PERF_TYPE_RAW)
return 0;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment