The branch stable/13 has been updated by mav: URL: https://cgit.FreeBSD.org/src/commit/?id=66e088e12b9fd3a42e5a92a0de79d75a3d4b5cd3
commit 66e088e12b9fd3a42e5a92a0de79d75a3d4b5cd3 Author: Alexander Motin <[email protected]> AuthorDate: 2021-08-08 22:19:08 +0000 Commit: Alexander Motin <[email protected]> CommitDate: 2021-08-22 00:27:25 +0000 kbdmux(4): Make callout handler mpsafe. Both callout and taskqueue now have drain() routines not requiring external locking. It allows to remove TASK flag and manual drain, so the only thing remaining for lock to protect inside the callout handler is ks_inq_length zero comparison, that can be lockless. MFC after: 2 weeks (cherry picked from commit e5018628e76a27e0f61ca03e2aa2247b3c62a158) --- sys/dev/kbdmux/kbdmux.c | 61 ++++++++----------------------------------------- 1 file changed, 10 insertions(+), 51 deletions(-) diff --git a/sys/dev/kbdmux/kbdmux.c b/sys/dev/kbdmux/kbdmux.c index 409e52c21716..3bbdc78b7c1a 100644 --- a/sys/dev/kbdmux/kbdmux.c +++ b/sys/dev/kbdmux/kbdmux.c @@ -105,12 +105,6 @@ MALLOC_DEFINE(M_KBDMUX, KEYBOARD_NAME, "Keyboard multiplexor"); mtx_unlock(&(s)->ks_lock) #define KBDMUX_LOCK_ASSERT(s, w) \ mtx_assert(&(s)->ks_lock, (w)) -#define KBDMUX_SLEEP(s, f, d, t) \ - msleep(&(s)->f, &(s)->ks_lock, PCATCH | (PZERO + 1), (d), (t)) -#define KBDMUX_CALLOUT_INIT(s) \ - callout_init_mtx(&(s)->ks_timo, &(s)->ks_lock, 0) -#define KBDMUX_QUEUE_INTR(s) \ - taskqueue_enqueue(taskqueue_swi_giant, &(s)->ks_task) #else #define KBDMUX_LOCK_DECL_GLOBAL @@ -124,12 +118,6 @@ MALLOC_DEFINE(M_KBDMUX, KEYBOARD_NAME, "Keyboard multiplexor"); #define KBDMUX_LOCK_ASSERT(s, w) -#define KBDMUX_SLEEP(s, f, d, t) \ - tsleep(&(s)->f, PCATCH | (PZERO + 1), (d), (t)) -#define KBDMUX_CALLOUT_INIT(s) \ - callout_init(&(s)->ks_timo, 0) -#define KBDMUX_QUEUE_INTR(s) \ - taskqueue_enqueue(taskqueue_swi_giant, &(s)->ks_task) #endif /* not yet */ /* @@ -157,7 +145,6 @@ struct kbdmux_state int ks_flags; /* flags */ #define COMPOSE (1 << 0) /* compose char flag */ -#define TASK (1 << 2) /* interrupt task queued */ int ks_polling; /* poll nesting count */ int ks_mode; /* K_XLATE, K_RAW, K_CODE */ @@ -223,16 +210,8 @@ void kbdmux_kbd_intr(void *xkbd, int pending) { keyboard_t *kbd = (keyboard_t *) xkbd; - kbdmux_state_t *state = (kbdmux_state_t *) kbd->kb_data; kbdd_intr(kbd, NULL); - - KBDMUX_LOCK(state); - - state->ks_flags &= ~TASK; - wakeup(&state->ks_task); - - KBDMUX_UNLOCK(state); } /* @@ -243,23 +222,12 @@ kbdmux_kbd_intr_timo(void *xstate) { kbdmux_state_t *state = (kbdmux_state_t *) xstate; - KBDMUX_LOCK_ASSERT(state, MA_OWNED); - - if (callout_pending(&state->ks_timo)) - return; /* callout was reset */ - - if (!callout_active(&state->ks_timo)) - return; /* callout was stopped */ - - callout_deactivate(&state->ks_timo); - /* queue interrupt task if needed */ - if (state->ks_inq_length > 0 && !(state->ks_flags & TASK) && - KBDMUX_QUEUE_INTR(state) == 0) - state->ks_flags |= TASK; + if (state->ks_inq_length > 0) + taskqueue_enqueue(taskqueue_swi_giant, &state->ks_task); /* re-schedule timeout */ - callout_reset(&state->ks_timo, TICKS, kbdmux_kbd_intr_timo, state); + callout_schedule(&state->ks_timo, TICKS); } /* @@ -299,9 +267,8 @@ kbdmux_kbd_event(keyboard_t *kbd, int event, void *arg) } /* queue interrupt task if needed */ - if (state->ks_inq_length > 0 && !(state->ks_flags & TASK) && - KBDMUX_QUEUE_INTR(state) == 0) - state->ks_flags |= TASK; + if (state->ks_inq_length > 0) + taskqueue_enqueue(taskqueue_swi_giant, &state->ks_task); KBDMUX_UNLOCK(state); } break; @@ -444,7 +411,7 @@ kbdmux_init(int unit, keyboard_t **kbdp, void *arg, int flags) KBDMUX_LOCK_INIT(state); TASK_INIT(&state->ks_task, 0, kbdmux_kbd_intr, (void *) kbd); - KBDMUX_CALLOUT_INIT(state); + callout_init(&state->ks_timo, 1); SLIST_INIT(&state->ks_kbds); } else if (KBD_IS_INITIALIZED(*kbdp) && KBD_IS_CONFIGURED(*kbdp)) { return (0); @@ -521,9 +488,7 @@ kbdmux_init(int unit, keyboard_t **kbdp, void *arg, int flags) KBD_CONFIG_DONE(kbd); - KBDMUX_LOCK(state); callout_reset(&state->ks_timo, TICKS, kbdmux_kbd_intr_timo, state); - KBDMUX_UNLOCK(state); } return (0); @@ -555,16 +520,8 @@ kbdmux_term(keyboard_t *kbd) kbdmux_state_t *state = (kbdmux_state_t *) kbd->kb_data; kbdmux_kbd_t *k; - KBDMUX_LOCK(state); - - /* kill callout */ - callout_stop(&state->ks_timo); - - /* wait for interrupt task */ - while (state->ks_flags & TASK) - KBDMUX_SLEEP(state, ks_task, "kbdmuxc", 0); - /* release all keyboards from the mux */ + KBDMUX_LOCK(state); while ((k = SLIST_FIRST(&state->ks_kbds)) != NULL) { kbd_release(k->kbd, &k->kbd); SLIST_REMOVE_HEAD(&state->ks_kbds, next); @@ -573,9 +530,11 @@ kbdmux_term(keyboard_t *kbd) free(k, M_KBDMUX); } - KBDMUX_UNLOCK(state); + callout_drain(&state->ks_timo); + taskqueue_drain(taskqueue_swi_giant, &state->ks_task); + kbd_unregister(kbd); #ifdef EVDEV_SUPPORT _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/dev-commits-src-all To unsubscribe, send any mail to "[email protected]"
