From: Mark Rutland mark.rutland@arm.com
[ Upstream commit ca6f537e459e2da4b331fe8928d1a0b0f9301f42 ]
The SW_INCR event is somewhat unusual, and depends on the specific HW counter that it is programmed into. When programmed into PMEVCNTR<n>, SW_INCR will count any writes to PMSWINC_EL0 with bit n set, ignoring writes to SW_INCR with bit n clear.
Event rotation means that there's no fixed relationship between perf_events and HW counters, so this isn't all that useful.
Further, we program PMUSERENR.{SW,EN}=={0,0}, which causes EL0 writes to PMSWINC_EL0 to be trapped and handled as UNDEFINED, resulting in a SIGILL to userspace.
Given that, it's not a good idea to expose SW_INCR in sysfs. Hide it as we did for CHAIN back in commit:
4ba2578fa7b55701 ("arm64: perf: don't expose CHAIN event in sysfs")
Signed-off-by: Mark Rutland mark.rutland@arm.com Cc: Will Deacon will@kernel.org Link: https://lore.kernel.org/r/20231204115847.2993026-1-mark.rutland@arm.com Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/kernel/perf_event.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c index b4044469527e..c77b9460d63e 100644 --- a/arch/arm64/kernel/perf_event.c +++ b/arch/arm64/kernel/perf_event.c @@ -168,7 +168,11 @@ armv8pmu_events_sysfs_show(struct device *dev, PMU_EVENT_ATTR_ID(name, armv8pmu_events_sysfs_show, config)
static struct attribute *armv8_pmuv3_event_attrs[] = { - ARMV8_EVENT_ATTR(sw_incr, ARMV8_PMUV3_PERFCTR_SW_INCR), + /* + * Don't expose the sw_incr event in /sys. It's not usable as writes to + * PMSWINC_EL0 will trap as PMUSERENR.{SW,EN}=={0,0} and event rotation + * means we don't have a fixed event<->counter relationship regardless. + */ ARMV8_EVENT_ATTR(l1i_cache_refill, ARMV8_PMUV3_PERFCTR_L1I_CACHE_REFILL), ARMV8_EVENT_ATTR(l1i_tlb_refill, ARMV8_PMUV3_PERFCTR_L1I_TLB_REFILL), ARMV8_EVENT_ATTR(l1d_cache_refill, ARMV8_PMUV3_PERFCTR_L1D_CACHE_REFILL),