perf/AMD/IBS: Add sysfs support
authorRobert Richter <robert.richter@amd.com>
Wed, 12 Sep 2012 10:59:44 +0000 (12:59 +0200)
committerIngo Molnar <mingo@kernel.org>
Fri, 5 Oct 2012 11:57:47 +0000 (13:57 +0200)
commit2e132b12f78d88672711ae1d87624951de1089ca
treebfbfa9b51e5e01ef9ad599816de2bb8915a2b10f
parentc942ee2e62dff1a7bc6f809965e93e46808d554c
perf/AMD/IBS: Add sysfs support

Add sysfs format entries for AMD IBS PMUs:

 # find /sys/bus/event_source/devices/ibs_*/format
 /sys/bus/event_source/devices/ibs_fetch/format
 /sys/bus/event_source/devices/ibs_fetch/format/rand_en
 /sys/bus/event_source/devices/ibs_op/format
 /sys/bus/event_source/devices/ibs_op/format/cnt_ctl

This allows to specify following IBS options:

 $ perf record -e ibs_fetch/rand_en=1/GH ...
 $ perf record -e ibs_op/cnt_ctl=1/GH ...

Option cnt_ctl is only enabled if the IBS_CAPS_OPCNT bit is set in IBS
cpuid feature flags (AMD family 10h RevC and above).

Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1347447584-28405-1-git-send-email-robert.richter@amd.com
[ Added small readability improvements. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kernel/cpu/perf_event_amd_ibs.c