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Fri, 21 Jul 2023 12:58:38 +0200 (CEST) Message-ID: <20230721105744.090372309@infradead.org> User-Agent: quilt/0.66 Date: Fri, 21 Jul 2023 12:22:43 +0200 From: Peter Zijlstra To: tglx@linutronix.de, axboe@kernel.dk Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, mingo@redhat.com, dvhart@infradead.org, dave@stgolabs.net, andrealmeid@igalia.com, Andrew Morton , urezki@gmail.com, hch@infradead.org, lstoakes@gmail.com, Arnd Bergmann , linux-api@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, malteskarupke@web.de Subject: [PATCH v1 06/14] futex: Add sys_futex_wait() References: <20230721102237.268073801@infradead.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: 0D390C0002 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: ys9w4ndae34catxbm8dyu5ksiejf4d9d X-HE-Tag: 1689937129-824471 X-HE-Meta: U2FsdGVkX19TlbFypBc8dGvFJIuKrOjayaZtl4iOkRkUlM2dXKIEDLrTZsm57GDUWdWQbtomz4rUIk2fRwww119LLC7gi6CiSVhF4YvPp1LmH7Hb+enrzBGQvC2WXrCmI8K/2iF1zhoEJU3CIsdPh8p08pMcu/e94l6nxxUbaDq9uM//k1tyVxBE8bu7K06kzIKT/USOuwR9Xcu9wdjZcIG9P1493gyTj4mlnAjWdPxhHYL+NDFowb3hQIuyjd2ajcROlGIm9Ld/QgQB9T++uLrT8nCTlCZkiVn4d68z/JVMhIg1bTkYMWP9hQaPEBzFKb8PL3ucqRd12QxiI9hfMH4bPFZj8XtvXRGeJ0dsUm8DQPYmEP4U/zN7TDdVFsgrIOts2SmT9AUtl8t1gRUkIvq4zMvIY8SScwLLCY+/MHPoVb1FgE3GuwHsxypDe8Lv2WJ111dD5WjoGYBQatOu+3b0ZvspmZ6pGKObKSImkxWXR7SvUeRIuPURi7sxVBJh2eq6hgpY07q9gBC3LTmHtb0qIof50oXxmVjOt6rtD68DUG0j1HBqWeW1cijbBV9lS98w7HPOXbnijAmxLFq74DahOgQTQq3p7s/sefe+fDqbDLS7LqdPhpKueMWHlEWf2I4uDoKxGGDUc6tvL1S6WYO1/Rx9fWsTiau0jyenxZZm+VyXr+oKQpX9J/6fnjttGA1wbJ9c2nTTQAItFtSXNmFYPaVGeOhSvSsrw+k4gZgHpjdL+wk04ekAaVpO1r7f1w+IpTWrj/s1//lNl+vmh0x5SmFL7YpMWSKdbNdHITIwPjG4vyP5hqXXDVMEvkEu0xwSW1QfK3JOSxQUbqouJrQG4Kg6EPZL6xSz+QbgD+8qkcuYTKMs3goyn45KyuwZR+UGkNKoUYZNE6KFHuLq2E9BBcZ7UGMuRQJgPBGR7CZn9Ai7epYEoy5WG8ozBzZYV9yXUlhkkcgIHJf6WAG ue6p4GfL iLmF+DOjrEtoz4wfvwKX5jGBEjMmzQEm2ZIP7jERTSdCSz0xtE3cuB/p+i53x0FG5pOQO0VOlHq2F2jZi9bmGE0t/LzI1o4bcWJFVPPy9JzJWW2STZUaUbTLg3boF6AS2QHq2b+E8uUAkWNquaMFinBk5EwtG+kuj+eswoA6XmQJRRyWCqcqGrpNRh1vDiE55v0PqJ7uaa8O6ttYUQeDq3x2JtwJfVuDVGJKYZYG+pgJbrU1lWYY8RT8PJ2A43+q58vhnA2Z2/O1Doq0eI26/sy29FT+HI0BZOUQZcI3abkWf4boWg1oGA+WB+6i8xjI56KHC X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: To complement sys_futex_waitv()/wake(), add sys_futex_wait(). This syscall implements what was previously known as FUTEX_WAIT_BITSET except it uses 'unsigned long' for the value and bitmask arguments, takes timespec and clockid_t arguments for the absolute timeout and uses FUTEX2 flags. The 'unsigned long' allows FUTEX2_64 on 64bit platforms. Signed-off-by: Peter Zijlstra (Intel) Acked-by: Geert Uytterhoeven --- arch/alpha/kernel/syscalls/syscall.tbl | 1 arch/arm/tools/syscall.tbl | 1 arch/arm64/include/asm/unistd32.h | 2 arch/ia64/kernel/syscalls/syscall.tbl | 1 arch/m68k/kernel/syscalls/syscall.tbl | 1 arch/microblaze/kernel/syscalls/syscall.tbl | 1 arch/mips/kernel/syscalls/syscall_n32.tbl | 1 arch/mips/kernel/syscalls/syscall_n64.tbl | 1 arch/mips/kernel/syscalls/syscall_o32.tbl | 1 arch/parisc/kernel/syscalls/syscall.tbl | 1 arch/powerpc/kernel/syscalls/syscall.tbl | 1 arch/s390/kernel/syscalls/syscall.tbl | 1 arch/sh/kernel/syscalls/syscall.tbl | 1 arch/sparc/kernel/syscalls/syscall.tbl | 1 arch/x86/entry/syscalls/syscall_32.tbl | 1 arch/x86/entry/syscalls/syscall_64.tbl | 1 arch/xtensa/kernel/syscalls/syscall.tbl | 1 include/linux/syscalls.h | 4 include/uapi/asm-generic/unistd.h | 4 kernel/futex/futex.h | 3 kernel/futex/syscalls.c | 120 +++++++++++++++++++++------- kernel/futex/waitwake.c | 65 ++++++++------- kernel/sys_ni.c | 1 23 files changed, 156 insertions(+), 59 deletions(-) --- a/arch/alpha/kernel/syscalls/syscall.tbl +++ b/arch/alpha/kernel/syscalls/syscall.tbl @@ -492,3 +492,4 @@ 560 common set_mempolicy_home_node sys_ni_syscall 561 common cachestat sys_cachestat 562 common futex_wake sys_futex_wake +563 common futex_wait sys_futex_wait --- a/arch/arm/tools/syscall.tbl +++ b/arch/arm/tools/syscall.tbl @@ -466,3 +466,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common futex_wake sys_futex_wake +453 common futex_wait sys_futex_wait --- a/arch/arm64/include/asm/unistd32.h +++ b/arch/arm64/include/asm/unistd32.h @@ -911,6 +911,8 @@ __SYSCALL(__NR_set_mempolicy_home_node, __SYSCALL(__NR_cachestat, sys_cachestat) #define __NR_futex_wake 452 __SYSCALL(__NR_futex_wake, sys_futex_wake) +#define __NR_futex_wait 453 +__SYSCALL(__NR_futex_wait, sys_futex_wait) /* * Please add new compat syscalls above this comment and update --- a/arch/ia64/kernel/syscalls/syscall.tbl +++ b/arch/ia64/kernel/syscalls/syscall.tbl @@ -373,3 +373,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common futex_wake sys_futex_wake +453 common futex_wait sys_futex_wait --- a/arch/m68k/kernel/syscalls/syscall.tbl +++ b/arch/m68k/kernel/syscalls/syscall.tbl @@ -452,3 +452,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common futex_wake sys_futex_wake +453 common futex_wait sys_futex_wait --- a/arch/microblaze/kernel/syscalls/syscall.tbl +++ b/arch/microblaze/kernel/syscalls/syscall.tbl @@ -458,3 +458,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common futex_wake sys_futex_wake +453 common futex_wait sys_futex_wait --- a/arch/mips/kernel/syscalls/syscall_n32.tbl +++ b/arch/mips/kernel/syscalls/syscall_n32.tbl @@ -391,3 +391,4 @@ 450 n32 set_mempolicy_home_node sys_set_mempolicy_home_node 451 n32 cachestat sys_cachestat 452 n32 futex_wake sys_futex_wake +453 n32 futex_wait sys_futex_wait --- a/arch/mips/kernel/syscalls/syscall_n64.tbl +++ b/arch/mips/kernel/syscalls/syscall_n64.tbl @@ -367,3 +367,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 n64 cachestat sys_cachestat 452 n64 futex_wake sys_futex_wake +453 n64 futex_wait sys_futex_wait --- a/arch/mips/kernel/syscalls/syscall_o32.tbl +++ b/arch/mips/kernel/syscalls/syscall_o32.tbl @@ -440,3 +440,4 @@ 450 o32 set_mempolicy_home_node sys_set_mempolicy_home_node 451 o32 cachestat sys_cachestat 452 o32 futex_wake sys_futex_wake +453 o32 futex_wait sys_futex_wait --- a/arch/parisc/kernel/syscalls/syscall.tbl +++ b/arch/parisc/kernel/syscalls/syscall.tbl @@ -451,3 +451,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common futex_wake sys_futex_wake +453 common futex_wait sys_futex_wait --- a/arch/powerpc/kernel/syscalls/syscall.tbl +++ b/arch/powerpc/kernel/syscalls/syscall.tbl @@ -539,3 +539,4 @@ 450 nospu set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common futex_wake sys_futex_wake +453 common futex_wait sys_futex_wait --- a/arch/s390/kernel/syscalls/syscall.tbl +++ b/arch/s390/kernel/syscalls/syscall.tbl @@ -455,3 +455,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat sys_cachestat 452 common futex_wake sys_futex_wake sys_futex_wake +453 common futex_wait sys_futex_wait sys_futex_wait --- a/arch/sh/kernel/syscalls/syscall.tbl +++ b/arch/sh/kernel/syscalls/syscall.tbl @@ -455,3 +455,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common futex_wake sys_futex_wake +453 common futex_wait sys_futex_wait --- a/arch/sparc/kernel/syscalls/syscall.tbl +++ b/arch/sparc/kernel/syscalls/syscall.tbl @@ -498,3 +498,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common futex_wake sys_futex_wake +453 common futex_wait sys_futex_wait --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -457,3 +457,4 @@ 450 i386 set_mempolicy_home_node sys_set_mempolicy_home_node 451 i386 cachestat sys_cachestat 452 i386 futex_wake sys_futex_wake +453 i386 futex_wait sys_futex_wait --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -374,6 +374,7 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common futex_wake sys_futex_wake +453 common futex_wait sys_futex_wait # # Due to a historical design error, certain syscalls are numbered differently --- a/arch/xtensa/kernel/syscalls/syscall.tbl +++ b/arch/xtensa/kernel/syscalls/syscall.tbl @@ -423,3 +423,4 @@ 450 common set_mempolicy_home_node sys_set_mempolicy_home_node 451 common cachestat sys_cachestat 452 common futex_wake sys_futex_wake +453 common futex_wait sys_futex_wait --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -566,6 +566,10 @@ asmlinkage long sys_futex_waitv(struct f asmlinkage long sys_futex_wake(void __user *uaddr, unsigned long mask, int nr, unsigned int flags); +asmlinkage long sys_futex_wait(void __user *uaddr, unsigned long val, unsigned long mask, + unsigned int flags, struct __kernel_timespec __user *timespec, + clockid_t clockid); + asmlinkage long sys_nanosleep(struct __kernel_timespec __user *rqtp, struct __kernel_timespec __user *rmtp); asmlinkage long sys_nanosleep_time32(struct old_timespec32 __user *rqtp, --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -820,9 +820,11 @@ __SYSCALL(__NR_set_mempolicy_home_node, __SYSCALL(__NR_cachestat, sys_cachestat) #define __NR_futex_wake 452 __SYSCALL(__NR_futex_wake, sys_futex_wake) +#define __NR_futex_wait 453 +__SYSCALL(__NR_futex_wait, sys_futex_wait) #undef __NR_syscalls -#define __NR_syscalls 453 +#define __NR_syscalls 454 /* * 32 bit systems traditionally used different --- a/kernel/futex/futex.h +++ b/kernel/futex/futex.h @@ -330,6 +330,9 @@ extern int futex_requeue(u32 __user *uad u32 __user *uaddr2, int nr_wake, int nr_requeue, u32 *cmpval, int requeue_pi); +extern int __futex_wait(u32 __user *uaddr, unsigned int flags, u32 val, + struct hrtimer_sleeper *to, u32 bitset); + extern int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val, ktime_t *abs_time, u32 bitset); --- a/kernel/futex/syscalls.c +++ b/kernel/futex/syscalls.c @@ -221,6 +221,46 @@ static int futex_parse_waitv(struct fute return 0; } +static int futex2_setup_timeout(struct __kernel_timespec __user *timeout, + clockid_t clockid, struct hrtimer_sleeper *to) +{ + int flag_clkid = 0, flag_init = 0; + struct timespec64 ts; + ktime_t time; + int ret; + + if (!timeout) + return 0; + + if (clockid == CLOCK_REALTIME) { + flag_clkid = FLAGS_CLOCKRT; + flag_init = FUTEX_CLOCK_REALTIME; + } + + if (clockid != CLOCK_REALTIME && clockid != CLOCK_MONOTONIC) + return -EINVAL; + + if (get_timespec64(&ts, timeout)) + return -EFAULT; + + /* + * Since there's no opcode for futex_waitv, use + * FUTEX_WAIT_BITSET that uses absolute timeout as well + */ + ret = futex_init_timeout(FUTEX_WAIT_BITSET, flag_init, &ts, &time); + if (ret) + return ret; + + futex_setup_timer(&time, to, flag_clkid, 0); + return 0; +} + +static inline void futex2_destroy_timeout(struct hrtimer_sleeper *to) +{ + hrtimer_cancel(&to->timer); + destroy_hrtimer_on_stack(&to->timer); +} + /** * sys_futex_waitv - Wait on a list of futexes * @waiters: List of futexes to wait on @@ -250,8 +290,6 @@ SYSCALL_DEFINE5(futex_waitv, struct fute { struct hrtimer_sleeper to; struct futex_vector *futexv; - struct timespec64 ts; - ktime_t time; int ret; /* This syscall supports no flags for now */ @@ -261,30 +299,8 @@ SYSCALL_DEFINE5(futex_waitv, struct fute if (!nr_futexes || nr_futexes > FUTEX_WAITV_MAX || !waiters) return -EINVAL; - if (timeout) { - int flag_clkid = 0, flag_init = 0; - - if (clockid == CLOCK_REALTIME) { - flag_clkid = FLAGS_CLOCKRT; - flag_init = FUTEX_CLOCK_REALTIME; - } - - if (clockid != CLOCK_REALTIME && clockid != CLOCK_MONOTONIC) - return -EINVAL; - - if (get_timespec64(&ts, timeout)) - return -EFAULT; - - /* - * Since there's no opcode for futex_waitv, use - * FUTEX_WAIT_BITSET that uses absolute timeout as well - */ - ret = futex_init_timeout(FUTEX_WAIT_BITSET, flag_init, &ts, &time); - if (ret) - return ret; - - futex_setup_timer(&time, &to, flag_clkid, 0); - } + if (timeout && (ret = futex2_setup_timeout(timeout, clockid, &to))) + return ret; futexv = kcalloc(nr_futexes, sizeof(*futexv), GFP_KERNEL); if (!futexv) { @@ -299,10 +315,8 @@ SYSCALL_DEFINE5(futex_waitv, struct fute kfree(futexv); destroy_timer: - if (timeout) { - hrtimer_cancel(&to.timer); - destroy_hrtimer_on_stack(&to.timer); - } + if (timeout) + futex2_destroy_timeout(&to); return ret; } @@ -336,6 +350,52 @@ SYSCALL_DEFINE4(futex_wake, return futex_wake(uaddr, flags, nr, mask); } +/* + * sys_futex_wait - Wait on a futex + * @uaddr: Address of the futex to wait on + * @val: Value of @uaddr + * @mask: bitmask + * @flags: FUTEX2 flags + * @timeout: Optional absolute timeout + * @clockid: Clock to be used for the timeout, realtime or monotonic + * + * Identical to the traditional FUTEX_WAIT_BITSET op, except it is part of the + * futex2 familiy of calls. + */ + +SYSCALL_DEFINE6(futex_wait, + void __user *, uaddr, + unsigned long, val, + unsigned long, mask, + unsigned int, flags, + struct __kernel_timespec __user *, timeout, + clockid_t, clockid) +{ + struct hrtimer_sleeper to; + int ret; + + if (flags & ~FUTEX2_MASK) + return -EINVAL; + + flags = futex2_to_flags(flags); + if (!futex_flags_valid(flags)) + return -EINVAL; + + if (!futex_validate_input(flags, val) || + !futex_validate_input(flags, mask)) + return -EINVAL; + + if (timeout && (ret = futex2_setup_timeout(timeout, clockid, &to))) + return ret; + + ret = __futex_wait(uaddr, flags, val, timeout ? &to : NULL, mask); + + if (timeout) + futex2_destroy_timeout(&to); + + return ret; +} + #ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE2(set_robust_list, struct compat_robust_list_head __user *, head, --- a/kernel/futex/waitwake.c +++ b/kernel/futex/waitwake.c @@ -629,20 +629,18 @@ int futex_wait_setup(u32 __user *uaddr, return ret; } -int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val, ktime_t *abs_time, u32 bitset) +int __futex_wait(u32 __user *uaddr, unsigned int flags, u32 val, + struct hrtimer_sleeper *to, u32 bitset) { - struct hrtimer_sleeper timeout, *to; - struct restart_block *restart; - struct futex_hash_bucket *hb; struct futex_q q = futex_q_init; + struct futex_hash_bucket *hb; int ret; if (!bitset) return -EINVAL; + q.bitset = bitset; - to = futex_setup_timer(abs_time, &timeout, flags, - current->timer_slack_ns); retry: /* * Prepare to wait on uaddr. On success, it holds hb->lock and q @@ -650,18 +648,17 @@ int futex_wait(u32 __user *uaddr, unsign */ ret = futex_wait_setup(uaddr, val, flags, &q, &hb); if (ret) - goto out; + return ret; /* futex_queue and wait for wakeup, timeout, or a signal. */ futex_wait_queue(hb, &q, to); /* If we were woken (and unqueued), we succeeded, whatever. */ - ret = 0; if (!futex_unqueue(&q)) - goto out; - ret = -ETIMEDOUT; + return 0; + if (to && !to->task) - goto out; + return -ETIMEDOUT; /* * We expect signal_pending(current), but we might be the @@ -670,24 +667,36 @@ int futex_wait(u32 __user *uaddr, unsign if (!signal_pending(current)) goto retry; - ret = -ERESTARTSYS; - if (!abs_time) - goto out; - - restart = ¤t->restart_block; - restart->futex.uaddr = uaddr; - restart->futex.val = val; - restart->futex.time = *abs_time; - restart->futex.bitset = bitset; - restart->futex.flags = flags | FLAGS_HAS_TIMEOUT; - - ret = set_restart_fn(restart, futex_wait_restart); - -out: - if (to) { - hrtimer_cancel(&to->timer); - destroy_hrtimer_on_stack(&to->timer); + return -ERESTARTSYS; +} + +int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val, ktime_t *abs_time, u32 bitset) +{ + struct hrtimer_sleeper timeout, *to; + struct restart_block *restart; + int ret; + + to = futex_setup_timer(abs_time, &timeout, flags, + current->timer_slack_ns); + + ret = __futex_wait(uaddr, flags, val, to, bitset); + if (!to) + return ret; + + hrtimer_cancel(&to->timer); + destroy_hrtimer_on_stack(&to->timer); + + if (ret == -ERESTARTSYS) { + restart = ¤t->restart_block; + restart->futex.uaddr = uaddr; + restart->futex.val = val; + restart->futex.time = *abs_time; + restart->futex.bitset = bitset; + restart->futex.flags = flags | FLAGS_HAS_TIMEOUT; + + return set_restart_fn(restart, futex_wait_restart); } + return ret; } --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -88,6 +88,7 @@ COND_SYSCALL(get_robust_list); COND_SYSCALL_COMPAT(get_robust_list); COND_SYSCALL(futex_waitv); COND_SYSCALL(futex_wake); +COND_SYSCALL(futex_wait); COND_SYSCALL(kexec_load); COND_SYSCALL_COMPAT(kexec_load); COND_SYSCALL(init_module);