void intel_bts_disable_local(void)
{
struct bts_ctx *bts = this_cpu_ptr(&bts_ctx);
if (bts->handle.event)
__bts_event_stop(bts->handle.event);
}
static void bts_event_stop(struct perf_event *event, int flags)
{
struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
struct bts_ctx *bts = this_cpu_ptr(&bts_ctx);
struct bts_buffer *buf = NULL;
int state = READ_ONCE(bts->state);
if (state == BTS_STATE_ACTIVE)
__bts_event_stop(event, BTS_STATE_STOPPED);
if (state != BTS_STATE_STOPPED)
buf = perf_get_aux(&bts->handle);
event->hw.state |= PERF_HES_STOPPED;
if (flags & PERF_EF_UPDATE) {
bts_update(bts);
if (buf) {
if (buf->snapshot)
bts->handle.head =
local_xchg(&buf->data_size,
buf->nr_pages << PAGE_SHIFT);
perf_aux_output_end(&bts->handle, local_xchg(&buf->data_size, 0),
!!local_xchg(&buf->lost, 0));
}
cpuc->ds->bts_index = bts->ds_back.bts_buffer_base;
cpuc->ds->bts_buffer_base = bts->ds_back.bts_buffer_base;
cpuc->ds->bts_absolute_maximum = bts->ds_back.bts_absolute_maximum;
cpuc->ds->bts_interrupt_threshold = bts->ds_back.bts_interrupt_threshold;
}
}
static void bts_event_stop(struct perf_event *event, int flags)
{
struct bts_ctx *bts = this_cpu_ptr(&bts_ctx);
/* PMI handler: don't restart this counter */
ACCESS_ONCE(bts->started) = 0;
__bts_event_stop(event);
if (flags & PERF_EF_UPDATE)
bts_update(bts);
}
void intel_bts_disable_local(void)
{
struct bts_ctx *bts = this_cpu_ptr(&bts_ctx);
/*
* Here we transition from ACTIVE to INACTIVE;
* do nothing for STOPPED or INACTIVE.
*/
if (READ_ONCE(bts->state) != BTS_STATE_ACTIVE)
return;
if (bts->handle.event)
__bts_event_stop(bts->handle.event, BTS_STATE_INACTIVE);
}
