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@ -77,62 +77,21 @@ __KERNEL_RCSID(1, "$NetBSD: linux_futex.c,v 1.7 2006/07/24 19:01:49 manu Exp $")
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/* DTrace init */
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LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
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/**
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* Futex part for the special DTrace module "locks".
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*/
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LIN_SDT_PROBE_DEFINE1(locks, futex_mtx, locked, "struct mtx *");
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LIN_SDT_PROBE_DEFINE1(locks, futex_mtx, unlock, "struct mtx *");
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/**
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* Per futex probes.
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*/
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LIN_SDT_PROBE_DEFINE1(futex, futex, create, "struct sx *");
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LIN_SDT_PROBE_DEFINE1(futex, futex, destroy, "struct sx *");
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/**
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* DTrace probes in this module.
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*/
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LIN_SDT_PROBE_DEFINE3(futex, futex_put, destroy, "uint32_t *", "uint32_t",
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"int");
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LIN_SDT_PROBE_DEFINE3(futex, futex_put, unlock, "uint32_t *", "uint32_t",
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"int");
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LIN_SDT_PROBE_DEFINE1(futex, futex_get0, umtx_key_get_error, "int");
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LIN_SDT_PROBE_DEFINE3(futex, futex_get0, shared, "uint32_t *", "uint32_t",
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"int");
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LIN_SDT_PROBE_DEFINE1(futex, futex_get0, null, "uint32_t *");
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LIN_SDT_PROBE_DEFINE3(futex, futex_get0, new, "uint32_t *", "uint32_t", "int");
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LIN_SDT_PROBE_DEFINE0(futex, futex_get, error);
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LIN_SDT_PROBE_DEFINE5(futex, futex_sleep, requeue_error, "int", "uint32_t *",
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"struct waiting_proc *", "uint32_t *", "uint32_t");
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LIN_SDT_PROBE_DEFINE3(futex, futex_sleep, sleep_error, "int", "uint32_t *",
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"struct waiting_proc *");
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LIN_SDT_PROBE_DEFINE3(futex, futex_wake, iterate, "uint32_t",
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"struct waiting_proc *", "uint32_t");
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LIN_SDT_PROBE_DEFINE1(futex, futex_wake, wakeup, "struct waiting_proc *");
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LIN_SDT_PROBE_DEFINE1(futex, futex_requeue, wakeup, "struct waiting_proc *");
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LIN_SDT_PROBE_DEFINE3(futex, futex_requeue, requeue, "uint32_t *",
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"struct waiting_proc *", "uint32_t");
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LIN_SDT_PROBE_DEFINE1(futex, futex_wait, sleep_error, "int");
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LIN_SDT_PROBE_DEFINE4(futex, futex_atomic_op, decoded_op, "int", "int", "int",
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"int");
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LIN_SDT_PROBE_DEFINE1(futex, futex_atomic_op, unimplemented_op, "int");
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LIN_SDT_PROBE_DEFINE1(futex, futex_atomic_op, unimplemented_cmp, "int");
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LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unimplemented_clockswitch);
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LIN_SDT_PROBE_DEFINE1(futex, linux_futex, copyin_error, "int");
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LIN_SDT_PROBE_DEFINE0(futex, linux_futex, invalid_cmp_requeue_use);
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LIN_SDT_PROBE_DEFINE3(futex, linux_futex, debug_wait, "uint32_t *",
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"uint32_t", "uint32_t");
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LIN_SDT_PROBE_DEFINE4(futex, linux_futex, debug_wait_value_neq,
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"uint32_t *", "uint32_t", "int", "uint32_t");
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LIN_SDT_PROBE_DEFINE3(futex, linux_futex, debug_wake, "uint32_t *",
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"uint32_t", "uint32_t");
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LIN_SDT_PROBE_DEFINE5(futex, linux_futex, debug_cmp_requeue, "uint32_t *",
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"uint32_t", "uint32_t", "uint32_t *", "struct l_timespec *");
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LIN_SDT_PROBE_DEFINE2(futex, linux_futex, debug_cmp_requeue_value_neq,
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"uint32_t", "int");
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LIN_SDT_PROBE_DEFINE5(futex, linux_futex, debug_wake_op, "uint32_t *",
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"int", "uint32_t", "uint32_t *", "uint32_t");
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LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unhandled_efault);
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LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unimplemented_lock_pi);
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LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unimplemented_unlock_pi);
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LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unimplemented_trylock_pi);
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@ -146,77 +105,10 @@ LIN_SDT_PROBE_DEFINE1(futex, handle_futex_death, copyin_error, "int");
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LIN_SDT_PROBE_DEFINE1(futex, fetch_robust_entry, copyin_error, "int");
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LIN_SDT_PROBE_DEFINE1(futex, release_futexes, copyin_error, "int");
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struct futex;
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#define FUTEX_SHARED 0x8 /* shared futex */
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struct waiting_proc {
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uint32_t wp_flags;
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struct futex *wp_futex;
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TAILQ_ENTRY(waiting_proc) wp_list;
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};
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#define GET_SHARED(a) (a->flags & FUTEX_SHARED) ? AUTO_SHARE : THREAD_SHARE
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struct futex {
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struct mtx f_lck;
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uint32_t *f_uaddr; /* user-supplied value, for debug */
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struct umtx_key f_key;
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uint32_t f_refcount;
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uint32_t f_bitset;
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LIST_ENTRY(futex) f_list;
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TAILQ_HEAD(lf_waiting_proc, waiting_proc) f_waiting_proc;
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};
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#define FUTEX_LOCK(f) mtx_lock(&(f)->f_lck)
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#define FUTEX_LOCKED(f) mtx_owned(&(f)->f_lck)
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#define FUTEX_UNLOCK(f) mtx_unlock(&(f)->f_lck)
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#define FUTEX_INIT(f) do { \
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mtx_init(&(f)->f_lck, "ftlk", NULL, \
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MTX_DUPOK); \
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LIN_SDT_PROBE1(futex, futex, create, \
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&(f)->f_lck); \
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} while (0)
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#define FUTEX_DESTROY(f) do { \
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LIN_SDT_PROBE1(futex, futex, destroy, \
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&(f)->f_lck); \
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mtx_destroy(&(f)->f_lck); \
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} while (0)
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#define FUTEX_ASSERT_LOCKED(f) mtx_assert(&(f)->f_lck, MA_OWNED)
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#define FUTEX_ASSERT_UNLOCKED(f) mtx_assert(&(f)->f_lck, MA_NOTOWNED)
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#define FUTEXES_LOCK do { \
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mtx_lock(&futex_mtx); \
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LIN_SDT_PROBE1(locks, futex_mtx, \
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locked, &futex_mtx); \
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} while (0)
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#define FUTEXES_UNLOCK do { \
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LIN_SDT_PROBE1(locks, futex_mtx, \
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unlock, &futex_mtx); \
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mtx_unlock(&futex_mtx); \
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} while (0)
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/* flags for futex_get() */
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#define FUTEX_CREATE_WP 0x1 /* create waiting_proc */
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#define FUTEX_DONTCREATE 0x2 /* don't create futex if not exists */
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#define FUTEX_DONTEXISTS 0x4 /* return EINVAL if futex exists */
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#define FUTEX_SHARED 0x8 /* shared futex */
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#define FUTEX_DONTLOCK 0x10 /* don't lock futex */
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/* wp_flags */
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#define FUTEX_WP_REQUEUED 0x1 /* wp requeued - wp moved from wp_list
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* of futex where thread sleep to wp_list
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* of another futex.
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*/
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#define FUTEX_WP_REMOVED 0x2 /* wp is woken up and removed from futex
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* wp_list to prevent double wakeup.
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*/
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static void futex_put(struct futex *, struct waiting_proc *);
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static int futex_get0(uint32_t *, struct futex **f, uint32_t);
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static int futex_get(uint32_t *, struct waiting_proc **, struct futex **,
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uint32_t);
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static int futex_sleep(struct futex *, struct waiting_proc *, struct timespec *);
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static int futex_wake(struct futex *, int, uint32_t);
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static int futex_requeue(struct futex *, int, struct futex *, int);
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static void futex_lock(struct futex *);
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static void futex_unlock(struct futex *);
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static int futex_atomic_op(struct thread *, int, uint32_t *);
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static int handle_futex_death(struct linux_emuldata *, uint32_t *,
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unsigned int);
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@ -236,320 +128,27 @@ struct linux_futex_args {
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struct timespec kts;
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};
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static void linux_umtx_abs_timeout_init(struct umtx_abs_timeout *,
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struct linux_futex_args *);
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static int linux_futex(struct thread *, struct linux_futex_args *);
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static int linux_futex_wait(struct thread *, struct linux_futex_args *);
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static int linux_futex_wake(struct thread *, struct linux_futex_args *);
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static int linux_futex_requeue(struct thread *, struct linux_futex_args *);
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static int linux_futex_wakeop(struct thread *, struct linux_futex_args *);
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static void
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futex_put(struct futex *f, struct waiting_proc *wp)
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int
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futex_wake(struct thread *td, uint32_t *uaddr, int val, bool shared)
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{
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struct linux_futex_args args;
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if (wp != NULL) {
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if ((wp->wp_flags & FUTEX_WP_REMOVED) == 0)
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TAILQ_REMOVE(&f->f_waiting_proc, wp, wp_list);
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free(wp, M_FUTEX_WP);
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}
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bzero(&args, sizeof(args));
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args.op = LINUX_FUTEX_WAKE;
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args.uaddr = uaddr;
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args.flags = shared == true ? FUTEX_SHARED : 0;
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args.val = val;
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args.val3 = FUTEX_BITSET_MATCH_ANY;
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FUTEXES_LOCK;
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if (--f->f_refcount == 0) {
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LIST_REMOVE(f, f_list);
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FUTEXES_UNLOCK;
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if (FUTEX_LOCKED(f))
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futex_unlock(f);
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LIN_SDT_PROBE3(futex, futex_put, destroy, f->f_uaddr,
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f->f_refcount, f->f_key.shared);
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LINUX_CTR3(sys_futex, "futex_put destroy uaddr %p ref %d "
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"shared %d", f->f_uaddr, f->f_refcount, f->f_key.shared);
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umtx_key_release(&f->f_key);
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FUTEX_DESTROY(f);
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free(f, M_FUTEX);
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return;
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}
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LIN_SDT_PROBE3(futex, futex_put, unlock, f->f_uaddr, f->f_refcount,
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f->f_key.shared);
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LINUX_CTR3(sys_futex, "futex_put uaddr %p ref %d shared %d",
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f->f_uaddr, f->f_refcount, f->f_key.shared);
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if (FUTEX_LOCKED(f))
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futex_unlock(f);
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FUTEXES_UNLOCK;
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}
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static int
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futex_get0(uint32_t *uaddr, struct futex **newf, uint32_t flags)
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{
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struct futex *f, *tmpf;
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struct umtx_key key;
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int error;
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*newf = tmpf = NULL;
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error = umtx_key_get(uaddr, TYPE_FUTEX, (flags & FUTEX_SHARED) ?
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AUTO_SHARE : THREAD_SHARE, &key);
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if (error) {
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LIN_SDT_PROBE1(futex, futex_get0, umtx_key_get_error, error);
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return (error);
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}
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retry:
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FUTEXES_LOCK;
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LIST_FOREACH(f, &futex_list, f_list) {
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if (umtx_key_match(&f->f_key, &key)) {
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if (tmpf != NULL) {
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if (FUTEX_LOCKED(tmpf))
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futex_unlock(tmpf);
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FUTEX_DESTROY(tmpf);
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free(tmpf, M_FUTEX);
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}
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if (flags & FUTEX_DONTEXISTS) {
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FUTEXES_UNLOCK;
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umtx_key_release(&key);
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return (EINVAL);
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}
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/*
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* Increment refcount of the found futex to
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* prevent it from deallocation before FUTEX_LOCK()
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*/
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++f->f_refcount;
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FUTEXES_UNLOCK;
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umtx_key_release(&key);
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if ((flags & FUTEX_DONTLOCK) == 0)
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futex_lock(f);
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*newf = f;
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LIN_SDT_PROBE3(futex, futex_get0, shared, uaddr,
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f->f_refcount, f->f_key.shared);
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LINUX_CTR3(sys_futex, "futex_get uaddr %p ref %d shared %d",
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uaddr, f->f_refcount, f->f_key.shared);
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return (0);
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}
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}
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if (flags & FUTEX_DONTCREATE) {
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FUTEXES_UNLOCK;
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umtx_key_release(&key);
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LIN_SDT_PROBE1(futex, futex_get0, null, uaddr);
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LINUX_CTR1(sys_futex, "futex_get uaddr %p null", uaddr);
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return (0);
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}
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if (tmpf == NULL) {
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FUTEXES_UNLOCK;
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tmpf = malloc(sizeof(*tmpf), M_FUTEX, M_WAITOK | M_ZERO);
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tmpf->f_uaddr = uaddr;
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tmpf->f_key = key;
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tmpf->f_refcount = 1;
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tmpf->f_bitset = FUTEX_BITSET_MATCH_ANY;
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|
|
|
|
FUTEX_INIT(tmpf);
|
|
|
|
|
TAILQ_INIT(&tmpf->f_waiting_proc);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Lock the new futex before an insert into the futex_list
|
|
|
|
|
* to prevent futex usage by other.
|
|
|
|
|
*/
|
|
|
|
|
if ((flags & FUTEX_DONTLOCK) == 0)
|
|
|
|
|
futex_lock(tmpf);
|
|
|
|
|
goto retry;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
LIST_INSERT_HEAD(&futex_list, tmpf, f_list);
|
|
|
|
|
FUTEXES_UNLOCK;
|
|
|
|
|
|
|
|
|
|
LIN_SDT_PROBE3(futex, futex_get0, new, uaddr, tmpf->f_refcount,
|
|
|
|
|
tmpf->f_key.shared);
|
|
|
|
|
LINUX_CTR3(sys_futex, "futex_get uaddr %p ref %d shared %d new",
|
|
|
|
|
uaddr, tmpf->f_refcount, tmpf->f_key.shared);
|
|
|
|
|
*newf = tmpf;
|
|
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
futex_get(uint32_t *uaddr, struct waiting_proc **wp, struct futex **f,
|
|
|
|
|
uint32_t flags)
|
|
|
|
|
{
|
|
|
|
|
int error;
|
|
|
|
|
|
|
|
|
|
if (flags & FUTEX_CREATE_WP) {
|
|
|
|
|
*wp = malloc(sizeof(struct waiting_proc), M_FUTEX_WP, M_WAITOK);
|
|
|
|
|
(*wp)->wp_flags = 0;
|
|
|
|
|
}
|
|
|
|
|
error = futex_get0(uaddr, f, flags);
|
|
|
|
|
if (error) {
|
|
|
|
|
LIN_SDT_PROBE0(futex, futex_get, error);
|
|
|
|
|
|
|
|
|
|
if (flags & FUTEX_CREATE_WP)
|
|
|
|
|
free(*wp, M_FUTEX_WP);
|
|
|
|
|
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
if (flags & FUTEX_CREATE_WP) {
|
|
|
|
|
TAILQ_INSERT_HEAD(&(*f)->f_waiting_proc, *wp, wp_list);
|
|
|
|
|
(*wp)->wp_futex = *f;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline void
|
|
|
|
|
futex_lock(struct futex *f)
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
LINUX_CTR3(sys_futex, "futex_lock uaddr %p ref %d shared %d",
|
|
|
|
|
f->f_uaddr, f->f_refcount, f->f_key.shared);
|
|
|
|
|
FUTEX_ASSERT_UNLOCKED(f);
|
|
|
|
|
FUTEX_LOCK(f);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline void
|
|
|
|
|
futex_unlock(struct futex *f)
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
LINUX_CTR3(sys_futex, "futex_unlock uaddr %p ref %d shared %d",
|
|
|
|
|
f->f_uaddr, f->f_refcount, f->f_key.shared);
|
|
|
|
|
FUTEX_ASSERT_LOCKED(f);
|
|
|
|
|
FUTEX_UNLOCK(f);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
futex_sleep(struct futex *f, struct waiting_proc *wp, struct timespec *ts)
|
|
|
|
|
{
|
|
|
|
|
sbintime_t sbt, prec, tmp;
|
|
|
|
|
time_t over;
|
|
|
|
|
int error;
|
|
|
|
|
|
|
|
|
|
FUTEX_ASSERT_LOCKED(f);
|
|
|
|
|
if (ts != NULL) {
|
|
|
|
|
if (ts->tv_sec > INT32_MAX / 2) {
|
|
|
|
|
over = ts->tv_sec - INT32_MAX / 2;
|
|
|
|
|
ts->tv_sec -= over;
|
|
|
|
|
}
|
|
|
|
|
tmp = tstosbt(*ts);
|
|
|
|
|
if (TIMESEL(&sbt, tmp))
|
|
|
|
|
sbt += tc_tick_sbt;
|
|
|
|
|
sbt += tmp;
|
|
|
|
|
prec = tmp;
|
|
|
|
|
prec >>= tc_precexp;
|
|
|
|
|
} else {
|
|
|
|
|
sbt = 0;
|
|
|
|
|
prec = 0;
|
|
|
|
|
}
|
|
|
|
|
LINUX_CTR4(sys_futex, "futex_sleep enter uaddr %p wp %p timo %ld ref %d",
|
|
|
|
|
f->f_uaddr, wp, sbt, f->f_refcount);
|
|
|
|
|
|
|
|
|
|
error = msleep_sbt(wp, &f->f_lck, PCATCH, "futex", sbt, prec, C_ABSOLUTE);
|
|
|
|
|
if (wp->wp_flags & FUTEX_WP_REQUEUED) {
|
|
|
|
|
KASSERT(f != wp->wp_futex, ("futex != wp_futex"));
|
|
|
|
|
|
|
|
|
|
if (error) {
|
|
|
|
|
LIN_SDT_PROBE5(futex, futex_sleep, requeue_error, error,
|
|
|
|
|
f->f_uaddr, wp, wp->wp_futex->f_uaddr,
|
|
|
|
|
wp->wp_futex->f_refcount);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
LINUX_CTR5(sys_futex, "futex_sleep out error %d uaddr %p wp"
|
|
|
|
|
" %p requeued uaddr %p ref %d",
|
|
|
|
|
error, f->f_uaddr, wp, wp->wp_futex->f_uaddr,
|
|
|
|
|
wp->wp_futex->f_refcount);
|
|
|
|
|
futex_put(f, NULL);
|
|
|
|
|
f = wp->wp_futex;
|
|
|
|
|
futex_lock(f);
|
|
|
|
|
} else {
|
|
|
|
|
if (error) {
|
|
|
|
|
LIN_SDT_PROBE3(futex, futex_sleep, sleep_error, error,
|
|
|
|
|
f->f_uaddr, wp);
|
|
|
|
|
}
|
|
|
|
|
LINUX_CTR3(sys_futex, "futex_sleep out error %d uaddr %p wp %p",
|
|
|
|
|
error, f->f_uaddr, wp);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
futex_put(f, wp);
|
|
|
|
|
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
futex_wake(struct futex *f, int n, uint32_t bitset)
|
|
|
|
|
{
|
|
|
|
|
struct waiting_proc *wp, *wpt;
|
|
|
|
|
int count = 0;
|
|
|
|
|
|
|
|
|
|
if (bitset == 0)
|
|
|
|
|
return (EINVAL);
|
|
|
|
|
|
|
|
|
|
FUTEX_ASSERT_LOCKED(f);
|
|
|
|
|
TAILQ_FOREACH_SAFE(wp, &f->f_waiting_proc, wp_list, wpt) {
|
|
|
|
|
LIN_SDT_PROBE3(futex, futex_wake, iterate, f->f_uaddr, wp,
|
|
|
|
|
f->f_refcount);
|
|
|
|
|
LINUX_CTR3(sys_futex, "futex_wake uaddr %p wp %p ref %d",
|
|
|
|
|
f->f_uaddr, wp, f->f_refcount);
|
|
|
|
|
/*
|
|
|
|
|
* Unless we find a matching bit in
|
|
|
|
|
* the bitset, continue searching.
|
|
|
|
|
*/
|
|
|
|
|
if (!(wp->wp_futex->f_bitset & bitset))
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
wp->wp_flags |= FUTEX_WP_REMOVED;
|
|
|
|
|
TAILQ_REMOVE(&f->f_waiting_proc, wp, wp_list);
|
|
|
|
|
LIN_SDT_PROBE1(futex, futex_wake, wakeup, wp);
|
|
|
|
|
wakeup_one(wp);
|
|
|
|
|
if (++count == n)
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return (count);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
futex_requeue(struct futex *f, int nrwake, struct futex *f2,
|
|
|
|
|
int nrrequeue)
|
|
|
|
|
{
|
|
|
|
|
struct waiting_proc *wp, *wpt;
|
|
|
|
|
int count = 0;
|
|
|
|
|
|
|
|
|
|
FUTEX_ASSERT_LOCKED(f);
|
|
|
|
|
FUTEX_ASSERT_LOCKED(f2);
|
|
|
|
|
|
|
|
|
|
TAILQ_FOREACH_SAFE(wp, &f->f_waiting_proc, wp_list, wpt) {
|
|
|
|
|
if (++count <= nrwake) {
|
|
|
|
|
LINUX_CTR2(sys_futex, "futex_req_wake uaddr %p wp %p",
|
|
|
|
|
f->f_uaddr, wp);
|
|
|
|
|
wp->wp_flags |= FUTEX_WP_REMOVED;
|
|
|
|
|
TAILQ_REMOVE(&f->f_waiting_proc, wp, wp_list);
|
|
|
|
|
LIN_SDT_PROBE1(futex, futex_requeue, wakeup, wp);
|
|
|
|
|
wakeup_one(wp);
|
|
|
|
|
} else {
|
|
|
|
|
LIN_SDT_PROBE3(futex, futex_requeue, requeue,
|
|
|
|
|
f->f_uaddr, wp, f2->f_uaddr);
|
|
|
|
|
LINUX_CTR3(sys_futex, "futex_requeue uaddr %p wp %p to %p",
|
|
|
|
|
f->f_uaddr, wp, f2->f_uaddr);
|
|
|
|
|
wp->wp_flags |= FUTEX_WP_REQUEUED;
|
|
|
|
|
/* Move wp to wp_list of f2 futex */
|
|
|
|
|
TAILQ_REMOVE(&f->f_waiting_proc, wp, wp_list);
|
|
|
|
|
TAILQ_INSERT_HEAD(&f2->f_waiting_proc, wp, wp_list);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Thread which sleeps on wp after waking should
|
|
|
|
|
* acquire f2 lock, so increment refcount of f2 to
|
|
|
|
|
* prevent it from premature deallocation.
|
|
|
|
|
*/
|
|
|
|
|
wp->wp_futex = f2;
|
|
|
|
|
FUTEXES_LOCK;
|
|
|
|
|
++f2->f_refcount;
|
|
|
|
|
FUTEXES_UNLOCK;
|
|
|
|
|
if (count - nrwake >= nrrequeue)
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return (count);
|
|
|
|
|
return (linux_futex_wake(td, &args));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
@ -631,20 +230,8 @@ linux_futex(struct thread *td, struct linux_futex_args *args)
|
|
|
|
|
} else
|
|
|
|
|
args->flags = FUTEX_SHARED;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Currently support for switching between CLOCK_MONOTONIC and
|
|
|
|
|
* CLOCK_REALTIME is not present. However Linux forbids the use of
|
|
|
|
|
* FUTEX_CLOCK_REALTIME with any op except FUTEX_WAIT_BITSET and
|
|
|
|
|
* FUTEX_WAIT_REQUEUE_PI.
|
|
|
|
|
*/
|
|
|
|
|
args->clockrt = args->op & LINUX_FUTEX_CLOCK_REALTIME;
|
|
|
|
|
args->op = args->op & ~LINUX_FUTEX_CLOCK_REALTIME;
|
|
|
|
|
if (args->clockrt && args->op != LINUX_FUTEX_WAIT_BITSET &&
|
|
|
|
|
args->op != LINUX_FUTEX_WAIT_REQUEUE_PI) {
|
|
|
|
|
LIN_SDT_PROBE0(futex, linux_futex,
|
|
|
|
|
unimplemented_clockswitch);
|
|
|
|
|
return (ENOSYS);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
switch (args->op) {
|
|
|
|
|
case LINUX_FUTEX_WAIT:
|
|
|
|
@ -785,87 +372,68 @@ linux_futex(struct thread *td, struct linux_futex_args *args)
|
|
|
|
|
static int
|
|
|
|
|
linux_futex_wakeop(struct thread *td, struct linux_futex_args *args)
|
|
|
|
|
{
|
|
|
|
|
struct umtx_key key, key2;
|
|
|
|
|
int nrwake, op_ret, ret;
|
|
|
|
|
struct futex *f, *f2;
|
|
|
|
|
int error, save;
|
|
|
|
|
uint32_t val;
|
|
|
|
|
int error, count;
|
|
|
|
|
|
|
|
|
|
if (args->uaddr == args->uaddr2)
|
|
|
|
|
return (EINVAL);
|
|
|
|
|
|
|
|
|
|
retry:
|
|
|
|
|
f = f2 = NULL;
|
|
|
|
|
error = futex_get(args->uaddr, NULL, &f, args->flags | FUTEX_DONTLOCK);
|
|
|
|
|
error = umtx_key_get(args->uaddr, TYPE_FUTEX, GET_SHARED(args), &key);
|
|
|
|
|
if (error != 0)
|
|
|
|
|
return (error);
|
|
|
|
|
|
|
|
|
|
error = futex_get(args->uaddr2, NULL, &f2, args->flags | FUTEX_DONTLOCK);
|
|
|
|
|
error = umtx_key_get(args->uaddr2, TYPE_FUTEX, GET_SHARED(args), &key2);
|
|
|
|
|
if (error != 0) {
|
|
|
|
|
futex_put(f, NULL);
|
|
|
|
|
umtx_key_release(&key);
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
futex_lock(f);
|
|
|
|
|
futex_lock(f2);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* This function returns positive number as results and
|
|
|
|
|
* negative as errors
|
|
|
|
|
*/
|
|
|
|
|
save = vm_fault_disable_pagefaults();
|
|
|
|
|
umtxq_lock(&key);
|
|
|
|
|
umtxq_busy(&key);
|
|
|
|
|
umtxq_unlock(&key);
|
|
|
|
|
op_ret = futex_atomic_op(td, args->val3, args->uaddr2);
|
|
|
|
|
vm_fault_enable_pagefaults(save);
|
|
|
|
|
|
|
|
|
|
LINUX_CTR2(sys_futex, "WAKE_OP atomic_op uaddr %p ret 0x%x",
|
|
|
|
|
args->uaddr, op_ret);
|
|
|
|
|
|
|
|
|
|
if (op_ret < 0) {
|
|
|
|
|
if (f2 != NULL)
|
|
|
|
|
futex_put(f2, NULL);
|
|
|
|
|
futex_put(f, NULL);
|
|
|
|
|
if (op_ret == -ENOSYS)
|
|
|
|
|
return (ENOSYS);
|
|
|
|
|
error = copyin(args->uaddr2, &val, sizeof(val));
|
|
|
|
|
if (error == 0)
|
|
|
|
|
goto retry;
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
ret = futex_wake(f, args->val, args->val3);
|
|
|
|
|
|
|
|
|
|
if (op_ret > 0) {
|
|
|
|
|
op_ret = 0;
|
|
|
|
|
nrwake = (int)(unsigned long)args->ts;
|
|
|
|
|
|
|
|
|
|
if (f2 != NULL)
|
|
|
|
|
op_ret += futex_wake(f2, nrwake, args->val3);
|
|
|
|
|
error = ENOSYS;
|
|
|
|
|
else
|
|
|
|
|
op_ret += futex_wake(f, nrwake, args->val3);
|
|
|
|
|
ret += op_ret;
|
|
|
|
|
error = EFAULT;
|
|
|
|
|
}
|
|
|
|
|
umtxq_lock(&key);
|
|
|
|
|
umtxq_unbusy(&key);
|
|
|
|
|
if (error != 0)
|
|
|
|
|
goto out;
|
|
|
|
|
ret = umtxq_signal_mask(&key, args->val, args->val3);
|
|
|
|
|
if (op_ret > 0) {
|
|
|
|
|
nrwake = (int)(unsigned long)args->ts;
|
|
|
|
|
umtxq_lock(&key2);
|
|
|
|
|
count = umtxq_count(&key2);
|
|
|
|
|
if (count > 0)
|
|
|
|
|
ret += umtxq_signal_mask(&key2, nrwake, args->val3);
|
|
|
|
|
else
|
|
|
|
|
ret += umtxq_signal_mask(&key, nrwake, args->val3);
|
|
|
|
|
umtxq_unlock(&key2);
|
|
|
|
|
}
|
|
|
|
|
if (f2 != NULL)
|
|
|
|
|
futex_put(f2, NULL);
|
|
|
|
|
futex_put(f, NULL);
|
|
|
|
|
td->td_retval[0] = ret;
|
|
|
|
|
return (0);
|
|
|
|
|
out:
|
|
|
|
|
umtxq_unlock(&key);
|
|
|
|
|
umtx_key_release(&key2);
|
|
|
|
|
umtx_key_release(&key);
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
linux_futex_requeue(struct thread *td, struct linux_futex_args *args)
|
|
|
|
|
{
|
|
|
|
|
int nrwake, nrrequeue;
|
|
|
|
|
struct futex *f, *f2;
|
|
|
|
|
struct umtx_key key, key2;
|
|
|
|
|
int error;
|
|
|
|
|
uint32_t val;
|
|
|
|
|
uint32_t uval;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Linux allows this, we would not, it is an incorrect
|
|
|
|
|
* usage of declared ABI, so return EINVAL.
|
|
|
|
|
*/
|
|
|
|
|
if (args->uaddr == args->uaddr2) {
|
|
|
|
|
LIN_SDT_PROBE0(futex, linux_futex,
|
|
|
|
|
invalid_cmp_requeue_use);
|
|
|
|
|
if (args->uaddr == args->uaddr2)
|
|
|
|
|
return (EINVAL);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
nrrequeue = (int)(unsigned long)args->ts;
|
|
|
|
|
nrwake = args->val;
|
|
|
|
@ -876,136 +444,121 @@ linux_futex_requeue(struct thread *td, struct linux_futex_args *args)
|
|
|
|
|
if (nrwake < 0 || nrrequeue < 0)
|
|
|
|
|
return (EINVAL);
|
|
|
|
|
|
|
|
|
|
retry:
|
|
|
|
|
f = f2 = NULL;
|
|
|
|
|
error = futex_get(args->uaddr, NULL, &f, args->flags | FUTEX_DONTLOCK);
|
|
|
|
|
error = umtx_key_get(args->uaddr, TYPE_FUTEX, GET_SHARED(args), &key);
|
|
|
|
|
if (error != 0)
|
|
|
|
|
return (error);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* To avoid deadlocks return EINVAL if second futex
|
|
|
|
|
* exists at this time.
|
|
|
|
|
*
|
|
|
|
|
* Glibc fall back to FUTEX_WAKE in case of any error
|
|
|
|
|
* returned by FUTEX_CMP_REQUEUE.
|
|
|
|
|
*/
|
|
|
|
|
error = futex_get(args->uaddr2, NULL, &f2,
|
|
|
|
|
args->flags | FUTEX_DONTEXISTS | FUTEX_DONTLOCK);
|
|
|
|
|
error = umtx_key_get(args->uaddr2, TYPE_FUTEX, GET_SHARED(args), &key2);
|
|
|
|
|
if (error != 0) {
|
|
|
|
|
futex_put(f, NULL);
|
|
|
|
|
umtx_key_release(&key);
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
futex_lock(f);
|
|
|
|
|
futex_lock(f2);
|
|
|
|
|
error = copyin_nofault(args->uaddr, &val, sizeof(val));
|
|
|
|
|
if (error != 0) {
|
|
|
|
|
futex_put(f2, NULL);
|
|
|
|
|
futex_put(f, NULL);
|
|
|
|
|
error = copyin(args->uaddr, &val, sizeof(val));
|
|
|
|
|
if (error == 0)
|
|
|
|
|
goto retry;
|
|
|
|
|
LIN_SDT_PROBE1(futex, linux_futex, copyin_error,
|
|
|
|
|
error);
|
|
|
|
|
LINUX_CTR1(sys_futex, "CMP_REQUEUE copyin failed %d",
|
|
|
|
|
error);
|
|
|
|
|
return (error);
|
|
|
|
|
umtxq_lock(&key);
|
|
|
|
|
umtxq_busy(&key);
|
|
|
|
|
umtxq_unlock(&key);
|
|
|
|
|
error = fueword32(args->uaddr, &uval);
|
|
|
|
|
if (error != 0)
|
|
|
|
|
error = EFAULT;
|
|
|
|
|
else if (args->val3_compare == true && uval != args->val3)
|
|
|
|
|
error = EWOULDBLOCK;
|
|
|
|
|
umtxq_lock(&key);
|
|
|
|
|
umtxq_unbusy(&key);
|
|
|
|
|
if (error == 0) {
|
|
|
|
|
umtxq_lock(&key2);
|
|
|
|
|
td->td_retval[0] = umtxq_requeue(&key, nrwake, &key2, nrrequeue);
|
|
|
|
|
umtxq_unlock(&key2);
|
|
|
|
|
}
|
|
|
|
|
if (args->val3_compare == true && val != args->val3) {
|
|
|
|
|
LIN_SDT_PROBE2(futex, linux_futex,
|
|
|
|
|
debug_cmp_requeue_value_neq, args->val, val);
|
|
|
|
|
LINUX_CTR2(sys_futex, "CMP_REQUEUE val 0x%x != uval 0x%x",
|
|
|
|
|
args->val, val);
|
|
|
|
|
futex_put(f2, NULL);
|
|
|
|
|
futex_put(f, NULL);
|
|
|
|
|
return (EAGAIN);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
td->td_retval[0] = futex_requeue(f, nrwake, f2, nrrequeue);
|
|
|
|
|
futex_put(f2, NULL);
|
|
|
|
|
futex_put(f, NULL);
|
|
|
|
|
return (0);
|
|
|
|
|
umtxq_unlock(&key);
|
|
|
|
|
umtx_key_release(&key2);
|
|
|
|
|
umtx_key_release(&key);
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
linux_futex_wake(struct thread *td, struct linux_futex_args *args)
|
|
|
|
|
{
|
|
|
|
|
struct futex *f;
|
|
|
|
|
struct umtx_key key;
|
|
|
|
|
int error;
|
|
|
|
|
|
|
|
|
|
f = NULL;
|
|
|
|
|
error = futex_get(args->uaddr, NULL, &f, args->flags | FUTEX_DONTCREATE);
|
|
|
|
|
if (args->val3 == 0)
|
|
|
|
|
return (EINVAL);
|
|
|
|
|
|
|
|
|
|
error = umtx_key_get(args->uaddr, TYPE_FUTEX, GET_SHARED(args), &key);
|
|
|
|
|
if (error != 0)
|
|
|
|
|
return (error);
|
|
|
|
|
|
|
|
|
|
if (f == NULL) {
|
|
|
|
|
td->td_retval[0] = 0;
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
td->td_retval[0] = futex_wake(f, args->val, args->val3);
|
|
|
|
|
futex_put(f, NULL);
|
|
|
|
|
umtxq_lock(&key);
|
|
|
|
|
td->td_retval[0] = umtxq_signal_mask(&key, args->val, args->val3);
|
|
|
|
|
umtxq_unlock(&key);
|
|
|
|
|
umtx_key_release(&key);
|
|
|
|
|
return (0);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
linux_futex_wait(struct thread *td, struct linux_futex_args *args)
|
|
|
|
|
{
|
|
|
|
|
struct waiting_proc *wp;
|
|
|
|
|
struct timespec kts;
|
|
|
|
|
struct futex *f;
|
|
|
|
|
struct umtx_abs_timeout timo;
|
|
|
|
|
struct umtx_q *uq;
|
|
|
|
|
uint32_t uval;
|
|
|
|
|
int error;
|
|
|
|
|
uint32_t val;
|
|
|
|
|
|
|
|
|
|
if (args->ts != NULL) {
|
|
|
|
|
if (args->clockrt) {
|
|
|
|
|
nanotime(&kts);
|
|
|
|
|
timespecsub(args->ts, &kts, args->ts);
|
|
|
|
|
} else if (args->op == LINUX_FUTEX_WAIT_BITSET) {
|
|
|
|
|
nanouptime(&kts);
|
|
|
|
|
timespecsub(args->ts, &kts, args->ts);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
if (args->val3 == 0)
|
|
|
|
|
error = EINVAL;
|
|
|
|
|
|
|
|
|
|
retry:
|
|
|
|
|
f = NULL;
|
|
|
|
|
error = futex_get(args->uaddr, &wp, &f, args->flags | FUTEX_CREATE_WP);
|
|
|
|
|
uq = td->td_umtxq;
|
|
|
|
|
error = umtx_key_get(args->uaddr, TYPE_FUTEX, GET_SHARED(args),
|
|
|
|
|
&uq->uq_key);
|
|
|
|
|
if (error != 0)
|
|
|
|
|
return (error);
|
|
|
|
|
|
|
|
|
|
error = copyin_nofault(args->uaddr, &val, sizeof(val));
|
|
|
|
|
if (error != 0) {
|
|
|
|
|
futex_put(f, wp);
|
|
|
|
|
error = copyin(args->uaddr, &val, sizeof(val));
|
|
|
|
|
if (error == 0)
|
|
|
|
|
goto retry;
|
|
|
|
|
LIN_SDT_PROBE1(futex, linux_futex, copyin_error, error);
|
|
|
|
|
LINUX_CTR1(sys_futex, "WAIT copyin failed %d", error);
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
if (val != args->val) {
|
|
|
|
|
LIN_SDT_PROBE4(futex, linux_futex,
|
|
|
|
|
debug_wait_value_neq, args->uaddr, args->val, val,
|
|
|
|
|
args->val3);
|
|
|
|
|
LINUX_CTR3(sys_futex,
|
|
|
|
|
"WAIT uaddr %p val 0x%x != uval 0x%x",
|
|
|
|
|
args->uaddr, args->val, val);
|
|
|
|
|
futex_put(f, wp);
|
|
|
|
|
return (EWOULDBLOCK);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (args->val3 == 0) {
|
|
|
|
|
futex_put(f, wp);
|
|
|
|
|
return (EINVAL);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
f->f_bitset = args->val3;
|
|
|
|
|
error = futex_sleep(f, wp, args->ts);
|
|
|
|
|
if (args->ts != NULL)
|
|
|
|
|
linux_umtx_abs_timeout_init(&timo, args);
|
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
|
|
|
umtxq_busy(&uq->uq_key);
|
|
|
|
|
uq->uq_bitset = args->val3;
|
|
|
|
|
umtxq_insert(uq);
|
|
|
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
|
error = fueword32(args->uaddr, &uval);
|
|
|
|
|
if (error != 0)
|
|
|
|
|
LIN_SDT_PROBE1(futex, futex_wait, sleep_error, error);
|
|
|
|
|
if (error == EWOULDBLOCK)
|
|
|
|
|
error = ETIMEDOUT;
|
|
|
|
|
error = EFAULT;
|
|
|
|
|
else if (uval != args->val)
|
|
|
|
|
error = EWOULDBLOCK;
|
|
|
|
|
umtxq_lock(&uq->uq_key);
|
|
|
|
|
umtxq_unbusy(&uq->uq_key);
|
|
|
|
|
if (error == 0) {
|
|
|
|
|
error = umtxq_sleep(uq, "futex",
|
|
|
|
|
args->ts == NULL ? NULL : &timo);
|
|
|
|
|
if ((uq->uq_flags & UQF_UMTXQ) == 0)
|
|
|
|
|
error = 0;
|
|
|
|
|
else
|
|
|
|
|
umtxq_remove(uq);
|
|
|
|
|
} else if ((uq->uq_flags & UQF_UMTXQ) != 0) {
|
|
|
|
|
umtxq_remove(uq);
|
|
|
|
|
}
|
|
|
|
|
umtxq_unlock(&uq->uq_key);
|
|
|
|
|
umtx_key_release(&uq->uq_key);
|
|
|
|
|
if (error == ERESTART)
|
|
|
|
|
error = EINTR;
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
linux_umtx_abs_timeout_init(struct umtx_abs_timeout *timo,
|
|
|
|
|
struct linux_futex_args *args)
|
|
|
|
|
{
|
|
|
|
|
int clockid, absolute;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* The FUTEX_CLOCK_REALTIME option bit can be employed only with the
|
|
|
|
|
* FUTEX_WAIT_BITSET, FUTEX_WAIT_REQUEUE_PI.
|
|
|
|
|
* For FUTEX_WAIT, timeout is interpreted as a relative value, for other
|
|
|
|
|
* futex operations timeout is interpreted as an absolute value.
|
|
|
|
|
* If FUTEX_CLOCK_REALTIME option bit is set, the Linux kernel measures
|
|
|
|
|
* the timeout against the CLOCK_REALTIME clock, otherwise the kernel
|
|
|
|
|
* measures the timeout against the CLOCK_MONOTONIC clock.
|
|
|
|
|
*/
|
|
|
|
|
clockid = args->clockrt ? CLOCK_REALTIME : CLOCK_MONOTONIC;
|
|
|
|
|
absolute = args->op == LINUX_FUTEX_WAIT ? false : true;
|
|
|
|
|
umtx_abs_timeout_init(timo, clockid, absolute, args->ts);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
linux_sys_futex(struct thread *td, struct linux_sys_futex_args *args)
|
|
|
|
|
{
|
|
|
|
@ -1149,7 +702,6 @@ handle_futex_death(struct linux_emuldata *em, uint32_t *uaddr,
|
|
|
|
|
unsigned int pi)
|
|
|
|
|
{
|
|
|
|
|
uint32_t uval, nval, mval;
|
|
|
|
|
struct futex *f;
|
|
|
|
|
int error;
|
|
|
|
|
|
|
|
|
|
retry:
|
|
|
|
@ -1169,14 +721,9 @@ handle_futex_death(struct linux_emuldata *em, uint32_t *uaddr,
|
|
|
|
|
goto retry;
|
|
|
|
|
|
|
|
|
|
if (!pi && (uval & FUTEX_WAITERS)) {
|
|
|
|
|
error = futex_get(uaddr, NULL, &f,
|
|
|
|
|
FUTEX_DONTCREATE | FUTEX_SHARED);
|
|
|
|
|
if (error)
|
|
|
|
|
error = futex_wake(curthread, uaddr, 1, true);
|
|
|
|
|
if (error != 0)
|
|
|
|
|
return (error);
|
|
|
|
|
if (f != NULL) {
|
|
|
|
|
futex_wake(f, 1, FUTEX_BITSET_MATCH_ANY);
|
|
|
|
|
futex_put(f, NULL);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|