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sched: walt: add sched_switch_ctrs_cfg event

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Create an event to periodically dump the configuration
of the pmu counter registers. This can be used in
conjunction with the existing sched_switch_with_ctrs
event to confirm which counter is configured in each
register.

Change-Id: Iaf11279e94d4af3f8aff522282585e680acd5f4d
Signed-off-by: Amir Vajid <avajid@codeaurora.org>
This commit is contained in:
Amir Vajid 2021-08-26 14:54:07 -07:00 committed by Rishabh Bhatnagar
parent 0e90c114dd
commit 4717a64824
2 changed files with 59 additions and 0 deletions
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52
kernel/sched/walt/perf_trace_counters.h
View File

@ -18,6 +18,7 @@
#define C4 0x10
#define C5 0x20
#define C_ALL (CC | C0 | C1 | C2 | C3 | C4 | C5)
#define TYPE_MASK 0xFFFF
#define NUM_L1_CTRS 6
#define NUM_AMU_CTRS 2
@ -117,6 +118,57 @@ TRACE_EVENT(sched_switch_with_ctrs,
__entry->amu0, __entry->amu1)
);
TRACE_EVENT(sched_switch_ctrs_cfg,
TP_PROTO(int cpu),
TP_ARGS(cpu),
TP_STRUCT__entry(
__field(int, cpu)
__field(unsigned long, ctr0)
__field(unsigned long, ctr1)
__field(unsigned long, ctr2)
__field(unsigned long, ctr3)
__field(unsigned long, ctr4)
__field(unsigned long, ctr5)
),
TP_fast_assign(
u32 i;
u32 cnten_val;
u32 ctr_type[NUM_L1_CTRS] = {0};
cnten_val = per_cpu(cntenset_val, cpu);
for (i = 0; i < NUM_L1_CTRS; i++) {
if (cnten_val & (1 << i)) {
/* Select */
write_sysreg(i, pmselr_el0);
isb();
/* Read type */
ctr_type[i] = read_sysreg(pmxevtyper_el0)
& TYPE_MASK;
} else
ctr_type[i] = 0;
}
__entry->cpu = cpu;
__entry->ctr0 = ctr_type[0];
__entry->ctr1 = ctr_type[1];
__entry->ctr2 = ctr_type[2];
__entry->ctr3 = ctr_type[3];
__entry->ctr4 = ctr_type[4];
__entry->ctr5 = ctr_type[5];
),
TP_printk("cpu=%d CTR0=%lu CTR1=%lu CTR2=%lu CTR3=%lu CTR4=%lu CTR5=%lu",
__entry->cpu,
__entry->ctr0, __entry->ctr1,
__entry->ctr2, __entry->ctr3,
__entry->ctr4, __entry->ctr5)
);
#endif
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH ../../kernel/sched/walt

7
kernel/sched/walt/walt_tp.c
View File

@ -20,6 +20,7 @@ DEFINE_PER_CPU(unsigned long[NUM_L1_CTRS], previous_l1_cnts);
DEFINE_PER_CPU(unsigned long[NUM_AMU_CTRS], previous_amu_cnts);
DEFINE_PER_CPU(u32, old_pid);
DEFINE_PER_CPU(u32, hotplug_flag);
DEFINE_PER_CPU(u64, prev_time);
static int tracectr_cpu_hotplug_coming_up(unsigned int cpu)
{
@ -54,6 +55,7 @@ void tracectr_notifier(void *ignore, bool preempt,
u32 cnten_val;
int current_pid;
u32 cpu = task_cpu(next);
u64 now;
if (!trace_sched_switch_with_ctrs_enabled())
return;
@ -71,6 +73,11 @@ void tracectr_notifier(void *ignore, bool preempt,
} else {
trace_sched_switch_with_ctrs(per_cpu(old_pid, cpu),
current_pid);
now = sched_clock();
if ((now - per_cpu(prev_time, cpu)) > NSEC_PER_SEC) {
trace_sched_switch_ctrs_cfg(cpu);
per_cpu(prev_time, cpu) = now;
}
}
/* Enable all the counters that were disabled */