^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/kthread.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/hrtimer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <asm/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) static int ss_get(void *data, u64 *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) ktime_t start, finish;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) int loops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) int cont;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) DEFINE_RAW_SPINLOCK(ss_spin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) loops = 1000000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) cont = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) start = ktime_get();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) while (cont) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) raw_spin_lock(&ss_spin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) loops--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) if (loops == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) cont = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) raw_spin_unlock(&ss_spin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) finish = ktime_get();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) *val = ktime_us_delta(finish, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) DEFINE_SIMPLE_ATTRIBUTE(fops_ss, ss_get, NULL, "%llu\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) struct spin_multi_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) raw_spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) atomic_t start_wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) atomic_t enter_wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) atomic_t exit_wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int loops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct spin_multi_per_thread {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct spin_multi_state *state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) ktime_t start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static int multi_other(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) int loops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) int cont;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct spin_multi_per_thread *pt = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct spin_multi_state *s = pt->state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) loops = s->loops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) cont = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) atomic_dec(&s->enter_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) while (atomic_read(&s->enter_wait))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) ; /* spin */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) pt->start = ktime_get();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) atomic_dec(&s->start_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) while (atomic_read(&s->start_wait))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) ; /* spin */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) while (cont) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) raw_spin_lock(&s->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) loops--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (loops == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) cont = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) raw_spin_unlock(&s->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) atomic_dec(&s->exit_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) while (atomic_read(&s->exit_wait))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) ; /* spin */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static int multi_get(void *data, u64 *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) ktime_t finish;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct spin_multi_state ms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct spin_multi_per_thread t1, t2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) ms.lock = __RAW_SPIN_LOCK_UNLOCKED("multi_get");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) ms.loops = 1000000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) atomic_set(&ms.start_wait, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) atomic_set(&ms.enter_wait, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) atomic_set(&ms.exit_wait, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) t1.state = &ms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) t2.state = &ms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) kthread_run(multi_other, &t2, "multi_get");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) multi_other(&t1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) finish = ktime_get();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) *val = ktime_us_delta(finish, t1.start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) DEFINE_SIMPLE_ATTRIBUTE(fops_multi, multi_get, NULL, "%llu\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static int __init spinlock_test(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) debugfs_create_file("spin_single", S_IRUGO, mips_debugfs_dir, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) &fops_ss);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) debugfs_create_file("spin_multi", S_IRUGO, mips_debugfs_dir, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) &fops_multi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) device_initcall(spinlock_test);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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