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MLK-13855-2: perf: ddr-perf: Always enable the cycles counter 

Always enable cycles counter 0, regardless if it is explicitly
selected by the user or not. The cycles counter generates overflow
interrupts that will be used to update other counters.

Signed-off-by: Tiberiu Breana <andrei-tiberiu.breana@nxp.com>
pull/10/head
Tiberiu Breana 2017-06-19 11:21:52 +03:00 committed by Jason Liu
parent a2489b6959
commit ec62579054
1 changed files with 18 additions and 1 deletions
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19
drivers/perf/ddr-perf.c
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@ -30,6 +30,7 @@
#define CNTL_CSV_MASK (0xFF << CNTL_CSV_SHIFT)
#define EVENT_CYCLES_ID 0
#define EVENT_CYCLES_COUNTER 0
#define NUM_COUNTER 4
#define MAX_EVENT 3
@ -85,6 +86,7 @@ struct ddr_pmu {
struct device *dev;
struct perf_event *active_events[NUM_COUNTER];
int total_events;
bool cycles_active;
};
static ssize_t ddr_perf_cpumask_show(struct device *dev,
@ -170,7 +172,7 @@ static u32 ddr_perf_alloc_counter(struct ddr_pmu *pmu, int event)
/* Always map cycle event to counter 0 */
if (event == EVENT_CYCLES_ID)
return 0;
return EVENT_CYCLES_COUNTER;
for (i = 1; i < NUM_COUNTER; i++)
if (pmu->active_events[i] == NULL)
@ -261,6 +263,9 @@ static void ddr_perf_event_enable(struct ddr_pmu *pmu, int config,
}
writel(val, pmu->base + reg);
if (config == EVENT_CYCLES_ID)
pmu->cycles_active = enable;
}
static void ddr_perf_event_start(struct perf_event *event, int flags)
@ -272,6 +277,13 @@ static void ddr_perf_event_start(struct perf_event *event, int flags)
local64_set(&hwc->prev_count, 0);
ddr_perf_event_enable(pmu, event->attr.config, counter, true);
/*
* If the cycles counter wasn't explicitly selected,
* we will enable it now.
*/
if (counter > 0 && !pmu->cycles_active)
ddr_perf_event_enable(pmu, EVENT_CYCLES_ID,
EVENT_CYCLES_COUNTER, true);
}
static int ddr_perf_event_add(struct perf_event *event, int flags)
@ -320,6 +332,11 @@ static void ddr_perf_event_del(struct perf_event *event, int flags)
ddr_perf_free_counter(pmu, counter);
pmu->total_events--;
hwc->idx = -1;
/* If all events have stopped, stop the cycles counter as well */
if ((pmu->total_events == 0) && pmu->cycles_active)
ddr_perf_event_enable(pmu, EVENT_CYCLES_ID,
EVENT_CYCLES_COUNTER, false);
}
static int ddr_perf_init(struct ddr_pmu *pmu, void __iomem *base,