Ravi Bangoria e7e61e09ce perf/amd/ibs: Fix perf_ibs_op.cnt_mask for CurCnt ... [ Upstream commit 46dcf85566 ] IBS Op uses two counters: MaxCnt and CurCnt. MaxCnt is programmed with the desired sample period. IBS hw generates sample when CurCnt reaches to MaxCnt. The size of these counter used to be 20 bits but later they were extended to 27 bits. The 7 bit extension is indicated by CPUID Fn8000_001B_EAX[6 / OpCntExt]. perf_ibs->cnt_mask variable contains bit masks for MaxCnt and CurCnt. But IBS driver does not set upper 7 bits of CurCnt in cnt_mask even when OpCntExt CPUID bit is set. Fix this. IBS driver uses cnt_mask[CurCnt] bits only while disabling an event. Fortunately, CurCnt bits are not read from MSR while re-enabling the event, instead MaxCnt is programmed with desired period and CurCnt is set to 0. Hence, we did not see any issues so far. Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/r/20250115054438.1021-5-ravi.bangoria@amd.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2025-06-04 14:40:17 +02:00
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amd	perf/amd/ibs: Fix perf_ibs_op.cnt_mask for CurCnt	2025-06-04 14:40:17 +02:00
intel	perf/x86/intel: KVM: Mask PEBS_ENABLE loaded for guest with vCPU's value.	2025-05-09 09:41:34 +02:00
zhaoxin	x86/perf/zhaoxin: Add stepping check for ZXC	2023-03-10 09:32:45 +01:00
core.c	perf/x86: Fix non-sampling (counting) events on certain x86 platforms	2025-05-02 07:46:55 +02:00
Kconfig	perf/x86/Kconfig: Fix indentation in the Kconfig file	2022-05-25 15:54:26 +02:00
Makefile	perf/x86: Move branch classifier	2022-08-27 00:05:44 +02:00
msr.c	perf/x86/msr: Add Emerald Rapids	2023-02-01 08:34:30 +01:00
perf_event_flags.h	x86/perf: Assert all platform event flags are within PERF_EVENT_FLAG_ARCH	2022-09-07 21:54:01 +02:00
perf_event.h	perf/x86/intel: Avoid disable PMU if !cpuc->enabled in sample read	2025-04-10 14:33:42 +02:00
probe.c	perf/x86/rapl: Add msr mask support	2021-02-10 14:44:54 +01:00
probe.h	perf/x86/rapl: Add msr mask support	2021-02-10 14:44:54 +01:00
rapl.c	perf/x86/rapl: Add support for Intel Emerald Rapids	2023-01-24 07:24:32 +01:00
utils.c	perf/x86/lbr: Filter vsyscall addresses	2023-10-19 23:08:56 +02:00