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Файловый менеджер - Редактировать - /usr/src/linux-headers-5.4.0-200/arch/csky/include/asm/spinlock.h

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/* SPDX-License-Identifier: GPL-2.0 / #ifndef __ASM_CSKY_SPINLOCK_H #define __ASM_CSKY_SPINLOCK_H #include <linux/spinlock_types.h> #include <asm/barrier.h> #ifdef CONFIG_QUEUED_RWLOCKS / * Ticket-based spin-locking. / static inline void arch_spin_lock(arch_spinlock_t lock) { arch_spinlock_t lockval; u32 ticket_next = 1 << TICKET_NEXT; u32 p = &lock->lock; u32 tmp; asm volatile ( "1: ldex.w %0, (%2) \n" " mov %1, %0 \n" " add %0, %3 \n" " stex.w %0, (%2) \n" " bez %0, 1b \n" : "=&r" (tmp), "=&r" (lockval) : "r"(p), "r"(ticket_next) : "cc"); while (lockval.tickets.next != lockval.tickets.owner) lockval.tickets.owner = READ_ONCE(lock->tickets.owner); smp_mb(); } static inline int arch_spin_trylock(arch_spinlock_t lock) { u32 tmp, contended, res; u32 ticket_next = 1 << TICKET_NEXT; u32 p = &lock->lock; do { asm volatile ( " ldex.w %0, (%3) \n" " movi %2, 1 \n" " rotli %1, %0, 16 \n" " cmpne %1, %0 \n" " bt 1f \n" " movi %2, 0 \n" " add %0, %0, %4 \n" " stex.w %0, (%3) \n" "1: \n" : "=&r" (res), "=&r" (tmp), "=&r" (contended) : "r"(p), "r"(ticket_next) : "cc"); } while (!res); if (!contended) smp_mb(); return !contended; } static inline void arch_spin_unlock(arch_spinlock_t lock) { smp_mb(); WRITE_ONCE(lock->tickets.owner, lock->tickets.owner + 1); } static inline int arch_spin_value_unlocked(arch_spinlock_t lock) { return lock.tickets.owner == lock.tickets.next; } static inline int arch_spin_is_locked(arch_spinlock_t lock) { return !arch_spin_value_unlocked(READ_ONCE(lock)); } static inline int arch_spin_is_contended(arch_spinlock_t lock) { struct __raw_tickets tickets = READ_ONCE(lock->tickets); return (tickets.next - tickets.owner) > 1; } #define arch_spin_is_contended arch_spin_is_contended #include <asm/qrwlock.h> / See include/linux/spinlock.h / #define smp_mb__after_spinlock() smp_mb() #else / CONFIG_QUEUED_RWLOCKS / / * Test-and-set spin-locking. / static inline void arch_spin_lock(arch_spinlock_t lock) { u32 p = &lock->lock; u32 tmp; asm volatile ( "1: ldex.w %0, (%1) \n" " bnez %0, 1b \n" " movi %0, 1 \n" " stex.w %0, (%1) \n" " bez %0, 1b \n" : "=&r" (tmp) : "r"(p) : "cc"); smp_mb(); } static inline void arch_spin_unlock(arch_spinlock_t lock) { smp_mb(); WRITE_ONCE(lock->lock, 0); } static inline int arch_spin_trylock(arch_spinlock_t lock) { u32 p = &lock->lock; u32 tmp; asm volatile ( "1: ldex.w %0, (%1) \n" " bnez %0, 2f \n" " movi %0, 1 \n" " stex.w %0, (%1) \n" " bez %0, 1b \n" " movi %0, 0 \n" "2: \n" : "=&r" (tmp) : "r"(p) : "cc"); if (!tmp) smp_mb(); return !tmp; } #define arch_spin_is_locked(x) (READ_ONCE((x)->lock) != 0) /* * read lock/unlock/trylock / static inline void arch_read_lock(arch_rwlock_t lock) { u32 p = &lock->lock; u32 tmp; asm volatile ( "1: ldex.w %0, (%1) \n" " blz %0, 1b \n" " addi %0, 1 \n" " stex.w %0, (%1) \n" " bez %0, 1b \n" : "=&r" (tmp) : "r"(p) : "cc"); smp_mb(); } static inline void arch_read_unlock(arch_rwlock_t lock) { u32 p = &lock->lock; u32 tmp; smp_mb(); asm volatile ( "1: ldex.w %0, (%1) \n" " subi %0, 1 \n" " stex.w %0, (%1) \n" " bez %0, 1b \n" : "=&r" (tmp) : "r"(p) : "cc"); } static inline int arch_read_trylock(arch_rwlock_t lock) { u32 p = &lock->lock; u32 tmp; asm volatile ( "1: ldex.w %0, (%1) \n" " blz %0, 2f \n" " addi %0, 1 \n" " stex.w %0, (%1) \n" " bez %0, 1b \n" " movi %0, 0 \n" "2: \n" : "=&r" (tmp) : "r"(p) : "cc"); if (!tmp) smp_mb(); return !tmp; } / * write lock/unlock/trylock / static inline void arch_write_lock(arch_rwlock_t lock) { u32 p = &lock->lock; u32 tmp; asm volatile ( "1: ldex.w %0, (%1) \n" " bnez %0, 1b \n" " subi %0, 1 \n" " stex.w %0, (%1) \n" " bez %0, 1b \n" : "=&r" (tmp) : "r"(p) : "cc"); smp_mb(); } static inline void arch_write_unlock(arch_rwlock_t lock) { smp_mb(); WRITE_ONCE(lock->lock, 0); } static inline int arch_write_trylock(arch_rwlock_t lock) { u32 p = &lock->lock; u32 tmp; asm volatile ( "1: ldex.w %0, (%1) \n" " bnez %0, 2f \n" " subi %0, 1 \n" " stex.w %0, (%1) \n" " bez %0, 1b \n" " movi %0, 0 \n" "2: \n" : "=&r" (tmp) : "r"(p) : "cc"); if (!tmp) smp_mb(); return !tmp; } #endif /* CONFIG_QUEUED_RWLOCKS / #endif / __ASM_CSKY_SPINLOCK_H */

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