static void __bts_event_start(struct perf_event *event) { struct bts_ctx *bts = this_cpu_ptr(&bts_ctx); struct bts_buffer *buf = perf_get_aux(&bts->handle); u64 config = 0; if (!buf || bts_buffer_is_full(buf, bts)) return; event->hw.state = 0; if (!buf->snapshot) config |= ARCH_PERFMON_EVENTSEL_INT; if (!event->attr.exclude_kernel) config |= ARCH_PERFMON_EVENTSEL_OS; if (!event->attr.exclude_user) config |= ARCH_PERFMON_EVENTSEL_USR; bts_config_buffer(buf); /* * local barrier to make sure that ds configuration made it * before we enable BTS */ wmb(); intel_pmu_enable_bts(config); }
static void __bts_event_start(struct perf_event *event) { struct bts_ctx *bts = this_cpu_ptr(&bts_ctx); struct bts_buffer *buf = perf_get_aux(&bts->handle); u64 config = 0; if (!buf->snapshot) config |= ARCH_PERFMON_EVENTSEL_INT; if (!event->attr.exclude_kernel) config |= ARCH_PERFMON_EVENTSEL_OS; if (!event->attr.exclude_user) config |= ARCH_PERFMON_EVENTSEL_USR; bts_config_buffer(buf); /* * local barrier to make sure that ds configuration made it * before we enable BTS and bts::state goes ACTIVE */ wmb(); /* INACTIVE/STOPPED -> ACTIVE */ WRITE_ONCE(bts->state, BTS_STATE_ACTIVE); intel_pmu_enable_bts(config); }