diff options
| -rw-r--r-- | kernel/irq/timings.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/kernel/irq/timings.c b/kernel/irq/timings.c index 5b13c2231d4f..e960d7ce7bcc 100644 --- a/kernel/irq/timings.c +++ b/kernel/irq/timings.c @@ -704,6 +704,68 @@ static struct timings_intervals tis[] __initdata = { { intervals4, ARRAY_SIZE(intervals4) }, }; +static int __init irq_timings_test_next_index(struct timings_intervals *ti) +{ + int _buffer[IRQ_TIMINGS_SIZE]; + int buffer[IRQ_TIMINGS_SIZE]; + int index, start, i, count, period_max; + + count = ti->count - 1; + + period_max = count > (3 * PREDICTION_PERIOD_MAX) ? + PREDICTION_PERIOD_MAX : count / 3; + + /* + * Inject all values except the last one which will be used + * to compare with the next index result. + */ + pr_debug("index suite: "); + + for (i = 0; i < count; i++) { + index = irq_timings_interval_index(ti->intervals[i]); + _buffer[i & IRQ_TIMINGS_MASK] = index; + pr_cont("%d ", index); + } + + start = count < IRQ_TIMINGS_SIZE ? 0 : + count & IRQ_TIMINGS_MASK; + + count = min_t(int, count, IRQ_TIMINGS_SIZE); + + for (i = 0; i < count; i++) { + int index = (start + i) & IRQ_TIMINGS_MASK; + buffer[i] = _buffer[index]; + } + + index = irq_timings_next_event_index(buffer, count, period_max); + i = irq_timings_interval_index(ti->intervals[ti->count - 1]); + + if (index != i) { + pr_err("Expected (%d) and computed (%d) next indexes differ\n", + i, index); + return -EINVAL; + } + + return 0; +} + +static int __init irq_timings_next_index_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_next_index(&tis[i]); + if (ret) + break; + } + + return ret; +} + static int __init irq_timings_test_irqs(struct timings_intervals *ti) { struct irqt_stat __percpu *s; @@ -875,6 +937,10 @@ static int __init irq_timings_selftest(void) goto out; ret = irq_timings_irqs_selftest(); + if (ret) + goto out; + + ret = irq_timings_next_index_selftest(); out: pr_info("---------- selftest end with %s -----------\n", ret ? "failure" : "success"); |