diff options
| author | Tiwei Bie <tiwei.btw@antgroup.com> | 2025-10-27 08:18:11 +0800 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2025-10-27 16:41:15 +0100 |
| commit | 9c82de55d4783e906f18219f833ad97fd8d9c5df (patch) | |
| tree | ea9428edb6dd080e20e1a0508f5b5797dabf0b45 /arch/um/os-Linux/time.c | |
| parent | 2670917c2fc8902558f3aba4f41e5cc5bf6e18fa (diff) | |
um: Define timers on a per-CPU basis
Define timers on a per-CPU basis to enable each CPU to have its
own timer. This is a preparation for adding SMP support.
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20251027001815.1666872-5-tiwei.bie@linux.dev
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'arch/um/os-Linux/time.c')
| -rw-r--r-- | arch/um/os-Linux/time.c | 29 |
1 files changed, 20 insertions, 9 deletions
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c index f3d4547e5227..e0197bfe4ac9 100644 --- a/arch/um/os-Linux/time.c +++ b/arch/um/os-Linux/time.c @@ -17,7 +17,7 @@ #include <string.h> #include "internal.h" -static timer_t event_high_res_timer = 0; +static timer_t event_high_res_timer[CONFIG_NR_CPUS] = { 0 }; static inline long long timespec_to_ns(const struct timespec *ts) { @@ -32,20 +32,30 @@ long long os_persistent_clock_emulation(void) return timespec_to_ns(&realtime_tp); } +#ifndef sigev_notify_thread_id +#define sigev_notify_thread_id _sigev_un._tid +#endif + /** * os_timer_create() - create an new posix (interval) timer */ int os_timer_create(void) { - timer_t *t = &event_high_res_timer; + timer_t *t = &event_high_res_timer[0]; + struct sigevent sev = { + .sigev_notify = SIGEV_THREAD_ID, + .sigev_signo = SIGALRM, + .sigev_value.sival_ptr = t, + .sigev_notify_thread_id = gettid(), + }; - if (timer_create(CLOCK_MONOTONIC, NULL, t) == -1) + if (timer_create(CLOCK_MONOTONIC, &sev, t) == -1) return -1; return 0; } -int os_timer_set_interval(unsigned long long nsecs) +int os_timer_set_interval(int cpu, unsigned long long nsecs) { struct itimerspec its; @@ -55,13 +65,13 @@ int os_timer_set_interval(unsigned long long nsecs) its.it_interval.tv_sec = nsecs / UM_NSEC_PER_SEC; its.it_interval.tv_nsec = nsecs % UM_NSEC_PER_SEC; - if (timer_settime(event_high_res_timer, 0, &its, NULL) == -1) + if (timer_settime(event_high_res_timer[cpu], 0, &its, NULL) == -1) return -errno; return 0; } -int os_timer_one_shot(unsigned long long nsecs) +int os_timer_one_shot(int cpu, unsigned long long nsecs) { struct itimerspec its = { .it_value.tv_sec = nsecs / UM_NSEC_PER_SEC, @@ -71,19 +81,20 @@ int os_timer_one_shot(unsigned long long nsecs) .it_interval.tv_nsec = 0, // we cheat here }; - timer_settime(event_high_res_timer, 0, &its, NULL); + timer_settime(event_high_res_timer[cpu], 0, &its, NULL); return 0; } /** * os_timer_disable() - disable the posix (interval) timer + * @cpu: the CPU for which the timer is to be disabled */ -void os_timer_disable(void) +void os_timer_disable(int cpu) { struct itimerspec its; memset(&its, 0, sizeof(struct itimerspec)); - timer_settime(event_high_res_timer, 0, &its, NULL); + timer_settime(event_high_res_timer[cpu], 0, &its, NULL); } long long os_nsecs(void) |