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genirq/timings: Add selftest for irqs circular buffer

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After testing the per cpu interrupt circular event, make sure the per
interrupt circular buffer usage is correct.

Add tests to validate the interrupt circular buffer.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: andriy.shevchenko@linux.intel.com
Link: https://lkml.kernel.org/r/20190527205521.12091-8-daniel.lezcano@linaro.org
This commit is contained in:
Daniel Lezcano 2019-05-27 22:55:20 +02:00 committed by Thomas Gleixner
parent 6aed82de71
commit f52da98d90
1 changed files with 139 additions and 0 deletions
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139
kernel/irq/timings.c
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@ -629,6 +629,141 @@ int irq_timings_alloc(int irq)
}
#ifdef CONFIG_TEST_IRQ_TIMINGS
struct timings_intervals {
u64 *intervals;
size_t count;
};
/*
* Intervals are given in nanosecond base
*/
static u64 intervals0[] __initdata = {
10000, 50000, 200000, 500000,
10000, 50000, 200000, 500000,
10000, 50000, 200000, 500000,
10000, 50000, 200000, 500000,
10000, 50000, 200000, 500000,
10000, 50000, 200000, 500000,
10000, 50000, 200000, 500000,
10000, 50000, 200000, 500000,
10000, 50000, 200000,
};
static u64 intervals1[] __initdata = {
223947000, 1240000, 1384000, 1386000, 1386000,
217416000, 1236000, 1384000, 1386000, 1387000,
214719000, 1241000, 1386000, 1387000, 1384000,
213696000, 1234000, 1384000, 1386000, 1388000,
219904000, 1240000, 1385000, 1389000, 1385000,
212240000, 1240000, 1386000, 1386000, 1386000,
214415000, 1236000, 1384000, 1386000, 1387000,
214276000, 1234000,
};
static u64 intervals2[] __initdata = {
4000, 3000, 5000, 100000,
3000, 3000, 5000, 117000,
4000, 4000, 5000, 112000,
4000, 3000, 4000, 110000,
3000, 5000, 3000, 117000,
4000, 4000, 5000, 112000,
4000, 3000, 4000, 110000,
3000, 4000, 5000, 112000,
4000,
};
static u64 intervals3[] __initdata = {
1385000, 212240000, 1240000,
1386000, 214415000, 1236000,
1384000, 214276000, 1234000,
1386000, 214415000, 1236000,
1385000, 212240000, 1240000,
1386000, 214415000, 1236000,
1384000, 214276000, 1234000,
1386000, 214415000, 1236000,
1385000, 212240000, 1240000,
};
static u64 intervals4[] __initdata = {
10000, 50000, 10000, 50000,
10000, 50000, 10000, 50000,
10000, 50000, 10000, 50000,
10000, 50000, 10000, 50000,
10000, 50000, 10000, 50000,
10000, 50000, 10000, 50000,
10000, 50000, 10000, 50000,
10000, 50000, 10000, 50000,
10000,
};
static struct timings_intervals tis[] __initdata = {
{ intervals0, ARRAY_SIZE(intervals0) },
{ intervals1, ARRAY_SIZE(intervals1) },
{ intervals2, ARRAY_SIZE(intervals2) },
{ intervals3, ARRAY_SIZE(intervals3) },
{ intervals4, ARRAY_SIZE(intervals4) },
};
static int __init irq_timings_test_irqs(struct timings_intervals *ti)
{
struct irqt_stat __percpu *s;
struct irqt_stat *irqs;
int i, index, ret, irq = 0xACE5;
ret = irq_timings_alloc(irq);
if (ret) {
pr_err("Failed to allocate irq timings\n");
return ret;
}
s = idr_find(&irqt_stats, irq);
if (!s) {
ret = -EIDRM;
goto out;
}
irqs = this_cpu_ptr(s);
for (i = 0; i < ti->count; i++) {
index = irq_timings_interval_index(ti->intervals[i]);
pr_debug("%d: interval=%llu ema_index=%d\n",
i, ti->intervals[i], index);
__irq_timings_store(irq, irqs, ti->intervals[i]);
if (irqs->circ_timings[i & IRQ_TIMINGS_MASK] != index) {
pr_err("Failed to store in the circular buffer\n");
goto out;
}
}
if (irqs->count != ti->count) {
pr_err("Count differs\n");
goto out;
}
ret = 0;
out:
irq_timings_free(irq);
return ret;
}
static int __init irq_timings_irqs_selftest(void)
{
int i, ret;
for (i = 0; i < ARRAY_SIZE(tis); i++) {
pr_info("---> Injecting intervals number #%d (count=%zd)\n",
i, tis[i].count);
ret = irq_timings_test_irqs(&tis[i]);
if (ret)
break;
}
return ret;
}
static int __init irq_timings_test_irqts(struct irq_timings *irqts,
unsigned count)
{
@ -736,7 +871,11 @@ static int __init irq_timings_selftest(void)
}
ret = irq_timings_irqts_selftest();
if (ret)
goto out;
ret = irq_timings_irqs_selftest();
out:
pr_info("---------- selftest end with %s -----------\n",
ret ? "failure" : "success");