diff options
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kernel/perf_cpum_sf.c | 55 |
1 files changed, 44 insertions, 11 deletions
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c index 51dbd8d90dbe..b9248a70b232 100644 --- a/arch/s390/kernel/perf_cpum_sf.c +++ b/arch/s390/kernel/perf_cpum_sf.c @@ -780,6 +780,10 @@ static int __hw_perf_event_init(struct perf_event *event) hwc->extra_reg.reg = REG_OVERFLOW; OVERFLOW_REG(hwc) = 0; + /* Use AUX buffer. No need to allocate it by ourself */ + if (attr->config == PERF_EVENT_CPUM_SF_DIAG) + return 0; + /* Allocate the per-CPU sampling buffer using the CPU information * from the event. If the event is not pinned to a particular * CPU (event->cpu == -1; or cpuhw == NULL), allocate sampling @@ -876,10 +880,15 @@ static void cpumsf_pmu_enable(struct pmu *pmu) */ if (cpuhw->event) { hwc = &cpuhw->event->hw; - /* Account number of overflow-designated buffer extents */ - sfb_account_overflows(cpuhw, hwc); - if (sfb_has_pending_allocs(&cpuhw->sfb, hwc)) - extend_sampling_buffer(&cpuhw->sfb, hwc); + if (!(SAMPL_DIAG_MODE(hwc))) { + /* + * Account number of overflow-designated + * buffer extents + */ + sfb_account_overflows(cpuhw, hwc); + if (sfb_has_pending_allocs(&cpuhw->sfb, hwc)) + extend_sampling_buffer(&cpuhw->sfb, hwc); + } } /* (Re)enable the PMU and sampling facility */ @@ -1225,6 +1234,13 @@ static void hw_perf_event_update(struct perf_event *event, int flush_all) unsigned long long event_overflow, sampl_overflow, num_sdb, te_flags; int done; + /* + * AUX buffer is used when in diagnostic sampling mode. + * No perf events/samples are created. + */ + if (SAMPL_DIAG_MODE(&event->hw)) + return; + if (flush_all && SDB_FULL_BLOCKS(hwc)) flush_all = 0; @@ -1785,12 +1801,13 @@ static void cpumsf_pmu_stop(struct perf_event *event, int flags) static int cpumsf_pmu_add(struct perf_event *event, int flags) { struct cpu_hw_sf *cpuhw = this_cpu_ptr(&cpu_hw_sf); + struct aux_buffer *aux; int err; if (cpuhw->flags & PMU_F_IN_USE) return -EAGAIN; - if (!cpuhw->sfb.sdbt) + if (!SAMPL_DIAG_MODE(&event->hw) && !cpuhw->sfb.sdbt) return -EINVAL; err = 0; @@ -1805,10 +1822,12 @@ static int cpumsf_pmu_add(struct perf_event *event, int flags) */ cpuhw->lsctl.s = 0; cpuhw->lsctl.h = 1; - cpuhw->lsctl.tear = (unsigned long) cpuhw->sfb.sdbt; - cpuhw->lsctl.dear = *(unsigned long *) cpuhw->sfb.sdbt; cpuhw->lsctl.interval = SAMPL_RATE(&event->hw); - hw_reset_registers(&event->hw, cpuhw->sfb.sdbt); + if (!SAMPL_DIAG_MODE(&event->hw)) { + cpuhw->lsctl.tear = (unsigned long) cpuhw->sfb.sdbt; + cpuhw->lsctl.dear = *(unsigned long *) cpuhw->sfb.sdbt; + hw_reset_registers(&event->hw, cpuhw->sfb.sdbt); + } /* Ensure sampling functions are in the disabled state. If disabled, * switch on sampling enable control. */ @@ -1816,9 +1835,18 @@ static int cpumsf_pmu_add(struct perf_event *event, int flags) err = -EAGAIN; goto out; } - cpuhw->lsctl.es = 1; - if (SAMPL_DIAG_MODE(&event->hw)) + if (SAMPL_DIAG_MODE(&event->hw)) { + aux = perf_aux_output_begin(&cpuhw->handle, event); + if (!aux) { + err = -EINVAL; + goto out; + } + err = aux_output_begin(&cpuhw->handle, aux, cpuhw); + if (err) + goto out; cpuhw->lsctl.ed = 1; + } + cpuhw->lsctl.es = 1; /* Set in_use flag and store event */ cpuhw->event = event; @@ -1844,6 +1872,8 @@ static void cpumsf_pmu_del(struct perf_event *event, int flags) cpuhw->flags &= ~PMU_F_IN_USE; cpuhw->event = NULL; + if (SAMPL_DIAG_MODE(&event->hw)) + aux_output_end(&cpuhw->handle); perf_event_update_userpage(event); perf_pmu_enable(event->pmu); } @@ -1917,7 +1947,10 @@ static void cpumf_measurement_alert(struct ext_code ext_code, /* Program alert request */ if (alert & CPU_MF_INT_SF_PRA) { if (cpuhw->flags & PMU_F_IN_USE) - hw_perf_event_update(cpuhw->event, 0); + if (SAMPL_DIAG_MODE(&cpuhw->event->hw)) + hw_collect_aux(cpuhw); + else + hw_perf_event_update(cpuhw->event, 0); else WARN_ON_ONCE(!(cpuhw->flags & PMU_F_IN_USE)); } |