From f26f9933e3e31b2117b804b6b8932388db88a131 Mon Sep 17 00:00:00 2001 From: Kajol Jain Date: Mon, 18 Nov 2024 17:11:14 +0530 Subject: powerpc/perf: Add per-task/process monitoring to vpa_pmu driver Enhance the vpa_pmu driver with a feature to observe context switch latency event for both per-task (tid) and per-pid (pid) option. Couple of new helper functions are added to hide the abstraction of reading the context switch latency counter from kvm_vcpu_arch struct and these helper functions are defined in the "kvm/book3s_hv.c". "PERF_ATTACH_TASK" flag is used to decide whether to read the counter values from lppaca or kvm_vcpu_arch struct. Signed-off-by: Kajol Jain Co-developed-by: Madhavan Srinivasan Signed-off-by: Madhavan Srinivasan Signed-off-by: Michael Ellerman Link: https://patch.msgid.link/20241118114114.208964-4-kjain@linux.ibm.com --- arch/powerpc/kvm/book3s_hv.c | 45 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) (limited to 'arch/powerpc/kvm') diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 613231c436e7..d8938fdf1936 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -4190,6 +4190,51 @@ u64 kvmhv_get_l2_runtime_agg(void) } EXPORT_SYMBOL(kvmhv_get_l2_runtime_agg); +u64 kvmhv_get_l1_to_l2_cs_time_vcpu(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vcpu_arch *arch; + + vcpu = local_paca->kvm_hstate.kvm_vcpu; + if (vcpu) { + arch = &vcpu->arch; + return arch->l1_to_l2_cs; + } else { + return 0; + } +} +EXPORT_SYMBOL(kvmhv_get_l1_to_l2_cs_time_vcpu); + +u64 kvmhv_get_l2_to_l1_cs_time_vcpu(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vcpu_arch *arch; + + vcpu = local_paca->kvm_hstate.kvm_vcpu; + if (vcpu) { + arch = &vcpu->arch; + return arch->l2_to_l1_cs; + } else { + return 0; + } +} +EXPORT_SYMBOL(kvmhv_get_l2_to_l1_cs_time_vcpu); + +u64 kvmhv_get_l2_runtime_agg_vcpu(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vcpu_arch *arch; + + vcpu = local_paca->kvm_hstate.kvm_vcpu; + if (vcpu) { + arch = &vcpu->arch; + return arch->l2_runtime_agg; + } else { + return 0; + } +} +EXPORT_SYMBOL(kvmhv_get_l2_runtime_agg_vcpu); + #else int kvmhv_get_l2_counters_status(void) { -- cgit v1.2.3