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devfreq: memlat: track cpu during ipi to cluster

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Will aid debugging lockups in perf_event_read_value()
track the cpu being ipi'd.

Change-Id: Ia948f31bb2d91bca6144c0c50f8f66bd9c1459fe
Signed-off-by: Stephen Dickey <[email protected]>
This commit is contained in:
Stephen Dickey 2020-04-30 17:08:37 -07:00
commit 92735374a1
1 changed files with 9 additions and 1 deletions
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10
drivers/devfreq/arm-memlat-mon.c
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@ -115,6 +115,7 @@ struct memlat_cpu_grp {
cpumask_t cpus;
unsigned int common_ev_ids[NUM_COMMON_EVS];
struct cpu_data *cpus_data;
int read_event_cpu;
ktime_t last_update_ts;
unsigned long last_ts_delta_us;
@ -180,8 +181,11 @@ static void update_counts(struct memlat_cpu_grp *cpu_grp)
struct cpu_data *cpu_data = to_cpu_data(cpu_grp, cpu);
struct event_data *common_evs = cpu_data->common_evs;
for (i = 0; i < NUM_COMMON_EVS; i++)
for (i = 0; i < NUM_COMMON_EVS; i++) {
cpu_grp->read_event_cpu = cpu;
read_event(&common_evs[i]);
cpu_grp->read_event_cpu = -1;
}
if (!common_evs[STALL_IDX].pevent)
common_evs[STALL_IDX].last_delta =
@ -202,7 +206,9 @@ static void update_counts(struct memlat_cpu_grp *cpu_grp)
for_each_cpu(cpu, &mon->cpus) {
unsigned int mon_idx =
cpu - cpumask_first(&mon->cpus);
cpu_grp->read_event_cpu = cpu;
read_event(&mon->miss_ev[mon_idx]);
cpu_grp->read_event_cpu = -1;
}
}
}
@ -743,6 +749,8 @@ static int memlat_cpu_grp_probe(struct platform_device *pdev)
return -ENODEV;
}
cpu_grp->read_event_cpu = -1;
num_mons = of_get_available_child_count(dev->of_node);
if (!num_mons) {