diff --git a/drivers/include/asm/preempt.h b/drivers/include/asm/preempt.h new file mode 100644 index 0000000000..ff44240a80 --- /dev/null +++ b/drivers/include/asm/preempt.h @@ -0,0 +1,109 @@ +#ifndef __ASM_PREEMPT_H +#define __ASM_PREEMPT_H + +#include +#include +//#include + +DECLARE_PER_CPU(int, __preempt_count); + +/* + * We use the PREEMPT_NEED_RESCHED bit as an inverted NEED_RESCHED such + * that a decrement hitting 0 means we can and should reschedule. + */ +#define PREEMPT_ENABLED (0 + PREEMPT_NEED_RESCHED) + +/* + * We mask the PREEMPT_NEED_RESCHED bit so as not to confuse all current users + * that think a non-zero value indicates we cannot preempt. + */ +static __always_inline int preempt_count(void) +{ + return raw_cpu_read_4(__preempt_count) & ~PREEMPT_NEED_RESCHED; +} + +static __always_inline void preempt_count_set(int pc) +{ + raw_cpu_write_4(__preempt_count, pc); +} + +/* + * must be macros to avoid header recursion hell + */ +#define init_task_preempt_count(p) do { \ + task_thread_info(p)->saved_preempt_count = PREEMPT_DISABLED; \ +} while (0) + +#define init_idle_preempt_count(p, cpu) do { \ + task_thread_info(p)->saved_preempt_count = PREEMPT_ENABLED; \ + per_cpu(__preempt_count, (cpu)) = PREEMPT_ENABLED; \ +} while (0) + +/* + * We fold the NEED_RESCHED bit into the preempt count such that + * preempt_enable() can decrement and test for needing to reschedule with a + * single instruction. + * + * We invert the actual bit, so that when the decrement hits 0 we know we both + * need to resched (the bit is cleared) and can resched (no preempt count). + */ + +static __always_inline void set_preempt_need_resched(void) +{ + raw_cpu_and_4(__preempt_count, ~PREEMPT_NEED_RESCHED); +} + +static __always_inline void clear_preempt_need_resched(void) +{ + raw_cpu_or_4(__preempt_count, PREEMPT_NEED_RESCHED); +} + +static __always_inline bool test_preempt_need_resched(void) +{ + return !(raw_cpu_read_4(__preempt_count) & PREEMPT_NEED_RESCHED); +} + +/* + * The various preempt_count add/sub methods + */ + +static __always_inline void __preempt_count_add(int val) +{ + raw_cpu_add_4(__preempt_count, val); +} + +static __always_inline void __preempt_count_sub(int val) +{ + raw_cpu_add_4(__preempt_count, -val); +} + +/* + * Because we keep PREEMPT_NEED_RESCHED set when we do _not_ need to reschedule + * a decrement which hits zero means we have no preempt_count and should + * reschedule. + */ +static __always_inline bool __preempt_count_dec_and_test(void) +{ + GEN_UNARY_RMWcc("decl", __preempt_count, __percpu_arg(0), "e"); +} + +/* + * Returns true when we need to resched and can (barring IRQ state). + */ +static __always_inline bool should_resched(void) +{ + return unlikely(!raw_cpu_read_4(__preempt_count)); +} + +#ifdef CONFIG_PREEMPT + extern asmlinkage void ___preempt_schedule(void); +# define __preempt_schedule() asm ("call ___preempt_schedule") + extern asmlinkage void preempt_schedule(void); +# ifdef CONFIG_CONTEXT_TRACKING + extern asmlinkage void ___preempt_schedule_context(void); +# define __preempt_schedule_context() asm ("call ___preempt_schedule_context") + extern asmlinkage void preempt_schedule_context(void); +# endif +#endif + +#endif /* __ASM_PREEMPT_H */ diff --git a/drivers/include/asm/rwsem.h b/drivers/include/asm/rwsem.h new file mode 100644 index 0000000000..cad82c9c2f --- /dev/null +++ b/drivers/include/asm/rwsem.h @@ -0,0 +1,225 @@ +/* rwsem.h: R/W semaphores implemented using XADD/CMPXCHG for i486+ + * + * Written by David Howells (dhowells@redhat.com). + * + * Derived from asm-x86/semaphore.h + * + * + * The MSW of the count is the negated number of active writers and waiting + * lockers, and the LSW is the total number of active locks + * + * The lock count is initialized to 0 (no active and no waiting lockers). + * + * When a writer subtracts WRITE_BIAS, it'll get 0xffff0001 for the case of an + * uncontended lock. This can be determined because XADD returns the old value. + * Readers increment by 1 and see a positive value when uncontended, negative + * if there are writers (and maybe) readers waiting (in which case it goes to + * sleep). + * + * The value of WAITING_BIAS supports up to 32766 waiting processes. This can + * be extended to 65534 by manually checking the whole MSW rather than relying + * on the S flag. + * + * The value of ACTIVE_BIAS supports up to 65535 active processes. + * + * This should be totally fair - if anything is waiting, a process that wants a + * lock will go to the back of the queue. When the currently active lock is + * released, if there's a writer at the front of the queue, then that and only + * that will be woken up; if there's a bunch of consequtive readers at the + * front, then they'll all be woken up, but no other readers will be. + */ + +#ifndef _ASM_X86_RWSEM_H +#define _ASM_X86_RWSEM_H + +#ifndef _LINUX_RWSEM_H +#error "please don't include asm/rwsem.h directly, use linux/rwsem.h instead" +#endif + +#ifdef __KERNEL__ +#include + +/* + * The bias values and the counter type limits the number of + * potential readers/writers to 32767 for 32 bits and 2147483647 + * for 64 bits. + */ + +#ifdef CONFIG_X86_64 +# define RWSEM_ACTIVE_MASK 0xffffffffL +#else +# define RWSEM_ACTIVE_MASK 0x0000ffffL +#endif + +#define RWSEM_UNLOCKED_VALUE 0x00000000L +#define RWSEM_ACTIVE_BIAS 0x00000001L +#define RWSEM_WAITING_BIAS (-RWSEM_ACTIVE_MASK-1) +#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS +#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS) + +/* + * lock for reading + */ +static inline void __down_read(struct rw_semaphore *sem) +{ + asm volatile("# beginning down_read\n\t" + LOCK_PREFIX _ASM_INC "(%1)\n\t" + /* adds 0x00000001 */ + " jns 1f\n" + " call call_rwsem_down_read_failed\n" + "1:\n\t" + "# ending down_read\n\t" + : "+m" (sem->count) + : "a" (sem) + : "memory", "cc"); +} + +/* + * trylock for reading -- returns 1 if successful, 0 if contention + */ +static inline int __down_read_trylock(struct rw_semaphore *sem) +{ + long result, tmp; + asm volatile("# beginning __down_read_trylock\n\t" + " mov %0,%1\n\t" + "1:\n\t" + " mov %1,%2\n\t" + " add %3,%2\n\t" + " jle 2f\n\t" + LOCK_PREFIX " cmpxchg %2,%0\n\t" + " jnz 1b\n\t" + "2:\n\t" + "# ending __down_read_trylock\n\t" + : "+m" (sem->count), "=&a" (result), "=&r" (tmp) + : "i" (RWSEM_ACTIVE_READ_BIAS) + : "memory", "cc"); + return result >= 0 ? 1 : 0; +} + +/* + * lock for writing + */ +static inline void __down_write_nested(struct rw_semaphore *sem, int subclass) +{ + long tmp; + asm volatile("# beginning down_write\n\t" + LOCK_PREFIX " xadd %1,(%2)\n\t" + /* adds 0xffff0001, returns the old value */ + " test " __ASM_SEL(%w1,%k1) "," __ASM_SEL(%w1,%k1) "\n\t" + /* was the active mask 0 before? */ + " jz 1f\n" + " call call_rwsem_down_write_failed\n" + "1:\n" + "# ending down_write" + : "+m" (sem->count), "=d" (tmp) + : "a" (sem), "1" (RWSEM_ACTIVE_WRITE_BIAS) + : "memory", "cc"); +} + +static inline void __down_write(struct rw_semaphore *sem) +{ + __down_write_nested(sem, 0); +} + +/* + * trylock for writing -- returns 1 if successful, 0 if contention + */ +static inline int __down_write_trylock(struct rw_semaphore *sem) +{ + long result, tmp; + asm volatile("# beginning __down_write_trylock\n\t" + " mov %0,%1\n\t" + "1:\n\t" + " test " __ASM_SEL(%w1,%k1) "," __ASM_SEL(%w1,%k1) "\n\t" + /* was the active mask 0 before? */ + " jnz 2f\n\t" + " mov %1,%2\n\t" + " add %3,%2\n\t" + LOCK_PREFIX " cmpxchg %2,%0\n\t" + " jnz 1b\n\t" + "2:\n\t" + " sete %b1\n\t" + " movzbl %b1, %k1\n\t" + "# ending __down_write_trylock\n\t" + : "+m" (sem->count), "=&a" (result), "=&r" (tmp) + : "er" (RWSEM_ACTIVE_WRITE_BIAS) + : "memory", "cc"); + return result; +} + +/* + * unlock after reading + */ +static inline void __up_read(struct rw_semaphore *sem) +{ + long tmp; + asm volatile("# beginning __up_read\n\t" + LOCK_PREFIX " xadd %1,(%2)\n\t" + /* subtracts 1, returns the old value */ + " jns 1f\n\t" + " call call_rwsem_wake\n" /* expects old value in %edx */ + "1:\n" + "# ending __up_read\n" + : "+m" (sem->count), "=d" (tmp) + : "a" (sem), "1" (-RWSEM_ACTIVE_READ_BIAS) + : "memory", "cc"); +} + +/* + * unlock after writing + */ +static inline void __up_write(struct rw_semaphore *sem) +{ + long tmp; + asm volatile("# beginning __up_write\n\t" + LOCK_PREFIX " xadd %1,(%2)\n\t" + /* subtracts 0xffff0001, returns the old value */ + " jns 1f\n\t" + " call call_rwsem_wake\n" /* expects old value in %edx */ + "1:\n\t" + "# ending __up_write\n" + : "+m" (sem->count), "=d" (tmp) + : "a" (sem), "1" (-RWSEM_ACTIVE_WRITE_BIAS) + : "memory", "cc"); +} + +/* + * downgrade write lock to read lock + */ +static inline void __downgrade_write(struct rw_semaphore *sem) +{ + asm volatile("# beginning __downgrade_write\n\t" + LOCK_PREFIX _ASM_ADD "%2,(%1)\n\t" + /* + * transitions 0xZZZZ0001 -> 0xYYYY0001 (i386) + * 0xZZZZZZZZ00000001 -> 0xYYYYYYYY00000001 (x86_64) + */ + " jns 1f\n\t" + " call call_rwsem_downgrade_wake\n" + "1:\n\t" + "# ending __downgrade_write\n" + : "+m" (sem->count) + : "a" (sem), "er" (-RWSEM_WAITING_BIAS) + : "memory", "cc"); +} + +/* + * implement atomic add functionality + */ +static inline void rwsem_atomic_add(long delta, struct rw_semaphore *sem) +{ + asm volatile(LOCK_PREFIX _ASM_ADD "%1,%0" + : "+m" (sem->count) + : "er" (delta)); +} + +/* + * implement exchange and add functionality + */ +static inline long rwsem_atomic_update(long delta, struct rw_semaphore *sem) +{ + return delta + xadd(&sem->count, delta); +} + +#endif /* __KERNEL__ */ +#endif /* _ASM_X86_RWSEM_H */ diff --git a/drivers/include/linux/bottom_half.h b/drivers/include/linux/bottom_half.h new file mode 100644 index 0000000000..86c12c93e3 --- /dev/null +++ b/drivers/include/linux/bottom_half.h @@ -0,0 +1,35 @@ +#ifndef _LINUX_BH_H +#define _LINUX_BH_H + +#include +#include + +#ifdef CONFIG_TRACE_IRQFLAGS +extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt); +#else +static __always_inline void __local_bh_disable_ip(unsigned long ip, unsigned int cnt) +{ + preempt_count_add(cnt); + barrier(); +} +#endif + +static inline void local_bh_disable(void) +{ + __local_bh_disable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET); +} + +extern void _local_bh_enable(void); +extern void __local_bh_enable_ip(unsigned long ip, unsigned int cnt); + +static inline void local_bh_enable_ip(unsigned long ip) +{ + __local_bh_enable_ip(ip, SOFTIRQ_DISABLE_OFFSET); +} + +static inline void local_bh_enable(void) +{ + __local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET); +} + +#endif /* _LINUX_BH_H */ diff --git a/drivers/include/linux/kernel.h b/drivers/include/linux/kernel.h index 58c3962eaf..6bc9667928 100644 --- a/drivers/include/linux/kernel.h +++ b/drivers/include/linux/kernel.h @@ -607,14 +607,6 @@ static inline void *dev_get_drvdata(struct device *dev) return dev->driver_data; } -#define preempt_disable() do { } while (0) -#define preempt_enable_no_resched() do { } while (0) -#define preempt_enable() do { } while (0) -#define preempt_check_resched() do { } while (0) - -#define preempt_disable_notrace() do { } while (0) -#define preempt_enable_no_resched_notrace() do { } while (0) -#define preempt_enable_notrace() do { } while (0) #define in_dbg_master() (0) @@ -738,24 +730,6 @@ struct pagelist { #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) -//#define RCU_INIT_POINTER(p, v) \ -// do { \ -// p = (typeof(*v) __force __rcu *)(v); \ -// } while (0) - - -//#define rcu_dereference_raw(p) ({ \ -// typeof(p) _________p1 = ACCESS_ONCE(p); \ -// (_________p1); \ -// }) - -//#define rcu_assign_pointer(p, v) \ -// ({ \ -// if (!__builtin_constant_p(v) || \ -// ((v) != NULL)) \ -// (p) = (v); \ -// }) - #define cpufreq_quick_get_max(x) GetCpuFreq() diff --git a/drivers/include/linux/mutex.h b/drivers/include/linux/mutex.h index 7338ac29ee..efded740b6 100644 --- a/drivers/include/linux/mutex.h +++ b/drivers/include/linux/mutex.h @@ -12,9 +12,10 @@ #include #include -#include +#include #include #include +#include #include /* diff --git a/drivers/include/linux/preempt.h b/drivers/include/linux/preempt.h new file mode 100644 index 0000000000..de83b4eb16 --- /dev/null +++ b/drivers/include/linux/preempt.h @@ -0,0 +1,195 @@ +#ifndef __LINUX_PREEMPT_H +#define __LINUX_PREEMPT_H + +/* + * include/linux/preempt.h - macros for accessing and manipulating + * preempt_count (used for kernel preemption, interrupt count, etc.) + */ + +#include +#include + +/* + * We use the MSB mostly because its available; see for + * the other bits -- can't include that header due to inclusion hell. + */ +#define PREEMPT_NEED_RESCHED 0x80000000 + +#include + +#if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER) +extern void preempt_count_add(int val); +extern void preempt_count_sub(int val); +#define preempt_count_dec_and_test() ({ preempt_count_sub(1); should_resched(); }) +#else +#define preempt_count_add(val) __preempt_count_add(val) +#define preempt_count_sub(val) __preempt_count_sub(val) +#define preempt_count_dec_and_test() __preempt_count_dec_and_test() +#endif + +#define __preempt_count_inc() __preempt_count_add(1) +#define __preempt_count_dec() __preempt_count_sub(1) + +#define preempt_count_inc() preempt_count_add(1) +#define preempt_count_dec() preempt_count_sub(1) + +#ifdef CONFIG_PREEMPT_COUNT + +#define preempt_disable() \ +do { \ + preempt_count_inc(); \ + barrier(); \ +} while (0) + +#define sched_preempt_enable_no_resched() \ +do { \ + barrier(); \ + preempt_count_dec(); \ +} while (0) + +#define preempt_enable_no_resched() sched_preempt_enable_no_resched() + +#ifdef CONFIG_PREEMPT +#define preempt_enable() \ +do { \ + barrier(); \ + if (unlikely(preempt_count_dec_and_test())) \ + __preempt_schedule(); \ +} while (0) + +#define preempt_check_resched() \ +do { \ + if (should_resched()) \ + __preempt_schedule(); \ +} while (0) + +#else +#define preempt_enable() \ +do { \ + barrier(); \ + preempt_count_dec(); \ +} while (0) +#define preempt_check_resched() do { } while (0) +#endif + +#define preempt_disable_notrace() \ +do { \ + __preempt_count_inc(); \ + barrier(); \ +} while (0) + +#define preempt_enable_no_resched_notrace() \ +do { \ + barrier(); \ + __preempt_count_dec(); \ +} while (0) + +#ifdef CONFIG_PREEMPT + +#ifndef CONFIG_CONTEXT_TRACKING +#define __preempt_schedule_context() __preempt_schedule() +#endif + +#define preempt_enable_notrace() \ +do { \ + barrier(); \ + if (unlikely(__preempt_count_dec_and_test())) \ + __preempt_schedule_context(); \ +} while (0) +#else +#define preempt_enable_notrace() \ +do { \ + barrier(); \ + __preempt_count_dec(); \ +} while (0) +#endif + +#else /* !CONFIG_PREEMPT_COUNT */ + +/* + * Even if we don't have any preemption, we need preempt disable/enable + * to be barriers, so that we don't have things like get_user/put_user + * that can cause faults and scheduling migrate into our preempt-protected + * region. + */ +#define preempt_disable() barrier() +#define sched_preempt_enable_no_resched() barrier() +#define preempt_enable_no_resched() barrier() +#define preempt_enable() barrier() +#define preempt_check_resched() do { } while (0) + +#define preempt_disable_notrace() barrier() +#define preempt_enable_no_resched_notrace() barrier() +#define preempt_enable_notrace() barrier() + +#endif /* CONFIG_PREEMPT_COUNT */ + +#ifdef MODULE +/* + * Modules have no business playing preemption tricks. + */ +#undef sched_preempt_enable_no_resched +#undef preempt_enable_no_resched +#undef preempt_enable_no_resched_notrace +#undef preempt_check_resched +#endif + +#define preempt_set_need_resched() \ +do { \ + set_preempt_need_resched(); \ +} while (0) +#define preempt_fold_need_resched() \ +do { \ + if (tif_need_resched()) \ + set_preempt_need_resched(); \ +} while (0) + +#ifdef CONFIG_PREEMPT_NOTIFIERS + +struct preempt_notifier; + +/** + * preempt_ops - notifiers called when a task is preempted and rescheduled + * @sched_in: we're about to be rescheduled: + * notifier: struct preempt_notifier for the task being scheduled + * cpu: cpu we're scheduled on + * @sched_out: we've just been preempted + * notifier: struct preempt_notifier for the task being preempted + * next: the task that's kicking us out + * + * Please note that sched_in and out are called under different + * contexts. sched_out is called with rq lock held and irq disabled + * while sched_in is called without rq lock and irq enabled. This + * difference is intentional and depended upon by its users. + */ +struct preempt_ops { + void (*sched_in)(struct preempt_notifier *notifier, int cpu); + void (*sched_out)(struct preempt_notifier *notifier, + struct task_struct *next); +}; + +/** + * preempt_notifier - key for installing preemption notifiers + * @link: internal use + * @ops: defines the notifier functions to be called + * + * Usually used in conjunction with container_of(). + */ +struct preempt_notifier { + struct hlist_node link; + struct preempt_ops *ops; +}; + +void preempt_notifier_register(struct preempt_notifier *notifier); +void preempt_notifier_unregister(struct preempt_notifier *notifier); + +static inline void preempt_notifier_init(struct preempt_notifier *notifier, + struct preempt_ops *ops) +{ + INIT_HLIST_NODE(¬ifier->link); + notifier->ops = ops; +} + +#endif + +#endif /* __LINUX_PREEMPT_H */ diff --git a/drivers/include/linux/preempt_mask.h b/drivers/include/linux/preempt_mask.h new file mode 100644 index 0000000000..dbeec4d4a3 --- /dev/null +++ b/drivers/include/linux/preempt_mask.h @@ -0,0 +1,117 @@ +#ifndef LINUX_PREEMPT_MASK_H +#define LINUX_PREEMPT_MASK_H + +#include + +/* + * We put the hardirq and softirq counter into the preemption + * counter. The bitmask has the following meaning: + * + * - bits 0-7 are the preemption count (max preemption depth: 256) + * - bits 8-15 are the softirq count (max # of softirqs: 256) + * + * The hardirq count could in theory be the same as the number of + * interrupts in the system, but we run all interrupt handlers with + * interrupts disabled, so we cannot have nesting interrupts. Though + * there are a few palaeontologic drivers which reenable interrupts in + * the handler, so we need more than one bit here. + * + * PREEMPT_MASK: 0x000000ff + * SOFTIRQ_MASK: 0x0000ff00 + * HARDIRQ_MASK: 0x000f0000 + * NMI_MASK: 0x00100000 + * PREEMPT_ACTIVE: 0x00200000 + */ +#define PREEMPT_BITS 8 +#define SOFTIRQ_BITS 8 +#define HARDIRQ_BITS 4 +#define NMI_BITS 1 + +#define PREEMPT_SHIFT 0 +#define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS) +#define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS) +#define NMI_SHIFT (HARDIRQ_SHIFT + HARDIRQ_BITS) + +#define __IRQ_MASK(x) ((1UL << (x))-1) + +#define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT) +#define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT) +#define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT) +#define NMI_MASK (__IRQ_MASK(NMI_BITS) << NMI_SHIFT) + +#define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT) +#define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT) +#define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT) +#define NMI_OFFSET (1UL << NMI_SHIFT) + +#define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET) + +#define PREEMPT_ACTIVE_BITS 1 +#define PREEMPT_ACTIVE_SHIFT (NMI_SHIFT + NMI_BITS) +#define PREEMPT_ACTIVE (__IRQ_MASK(PREEMPT_ACTIVE_BITS) << PREEMPT_ACTIVE_SHIFT) + +#define hardirq_count() (preempt_count() & HARDIRQ_MASK) +#define softirq_count() (preempt_count() & SOFTIRQ_MASK) +#define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK \ + | NMI_MASK)) + +/* + * Are we doing bottom half or hardware interrupt processing? + * Are we in a softirq context? Interrupt context? + * in_softirq - Are we currently processing softirq or have bh disabled? + * in_serving_softirq - Are we currently processing softirq? + */ +#define in_irq() (hardirq_count()) +#define in_softirq() (softirq_count()) +#define in_interrupt() (irq_count()) +#define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET) + +/* + * Are we in NMI context? + */ +#define in_nmi() (preempt_count() & NMI_MASK) + +#if defined(CONFIG_PREEMPT_COUNT) +# define PREEMPT_CHECK_OFFSET 1 +#else +# define PREEMPT_CHECK_OFFSET 0 +#endif + +/* + * The preempt_count offset needed for things like: + * + * spin_lock_bh() + * + * Which need to disable both preemption (CONFIG_PREEMPT_COUNT) and + * softirqs, such that unlock sequences of: + * + * spin_unlock(); + * local_bh_enable(); + * + * Work as expected. + */ +#define SOFTIRQ_LOCK_OFFSET (SOFTIRQ_DISABLE_OFFSET + PREEMPT_CHECK_OFFSET) + +/* + * Are we running in atomic context? WARNING: this macro cannot + * always detect atomic context; in particular, it cannot know about + * held spinlocks in non-preemptible kernels. Thus it should not be + * used in the general case to determine whether sleeping is possible. + * Do not use in_atomic() in driver code. + */ +#define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0) + +/* + * Check whether we were atomic before we did preempt_disable(): + * (used by the scheduler, *after* releasing the kernel lock) + */ +#define in_atomic_preempt_off() \ + ((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_CHECK_OFFSET) + +#ifdef CONFIG_PREEMPT_COUNT +# define preemptible() (preempt_count() == 0 && !irqs_disabled()) +#else +# define preemptible() 0 +#endif + +#endif /* LINUX_PREEMPT_MASK_H */ diff --git a/drivers/include/linux/rwlock_types.h b/drivers/include/linux/rwlock_types.h new file mode 100644 index 0000000000..cc0072e93e --- /dev/null +++ b/drivers/include/linux/rwlock_types.h @@ -0,0 +1,48 @@ +#ifndef __LINUX_RWLOCK_TYPES_H +#define __LINUX_RWLOCK_TYPES_H + +/* + * include/linux/rwlock_types.h - generic rwlock type definitions + * and initializers + * + * portions Copyright 2005, Red Hat, Inc., Ingo Molnar + * Released under the General Public License (GPL). + */ +typedef struct { + arch_rwlock_t raw_lock; +#ifdef CONFIG_GENERIC_LOCKBREAK + unsigned int break_lock; +#endif +#ifdef CONFIG_DEBUG_SPINLOCK + unsigned int magic, owner_cpu; + void *owner; +#endif +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +} rwlock_t; + +#define RWLOCK_MAGIC 0xdeaf1eed + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname } +#else +# define RW_DEP_MAP_INIT(lockname) +#endif + +#ifdef CONFIG_DEBUG_SPINLOCK +#define __RW_LOCK_UNLOCKED(lockname) \ + (rwlock_t) { .raw_lock = __ARCH_RW_LOCK_UNLOCKED, \ + .magic = RWLOCK_MAGIC, \ + .owner = SPINLOCK_OWNER_INIT, \ + .owner_cpu = -1, \ + RW_DEP_MAP_INIT(lockname) } +#else +#define __RW_LOCK_UNLOCKED(lockname) \ + (rwlock_t) { .raw_lock = __ARCH_RW_LOCK_UNLOCKED, \ + RW_DEP_MAP_INIT(lockname) } +#endif + +#define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x) + +#endif /* __LINUX_RWLOCK_TYPES_H */ diff --git a/drivers/include/linux/rwsem.h b/drivers/include/linux/rwsem.h new file mode 100644 index 0000000000..8f498cdde2 --- /dev/null +++ b/drivers/include/linux/rwsem.h @@ -0,0 +1,180 @@ +/* rwsem.h: R/W semaphores, public interface + * + * Written by David Howells (dhowells@redhat.com). + * Derived from asm-i386/semaphore.h + */ + +#ifndef _LINUX_RWSEM_H +#define _LINUX_RWSEM_H + +#include + +#include +#include +#include +#include +#include +#ifdef CONFIG_RWSEM_SPIN_ON_OWNER +#include +#endif + +struct rw_semaphore; + +#ifdef CONFIG_RWSEM_GENERIC_SPINLOCK +#include /* use a generic implementation */ +#else +/* All arch specific implementations share the same struct */ +struct rw_semaphore { + long count; + struct list_head wait_list; + raw_spinlock_t wait_lock; +#ifdef CONFIG_RWSEM_SPIN_ON_OWNER + struct optimistic_spin_queue osq; /* spinner MCS lock */ + /* + * Write owner. Used as a speculative check to see + * if the owner is running on the cpu. + */ + struct task_struct *owner; +#endif +#ifdef CONFIG_DEBUG_LOCK_ALLOC + struct lockdep_map dep_map; +#endif +}; + +extern struct rw_semaphore *rwsem_down_read_failed(struct rw_semaphore *sem); +extern struct rw_semaphore *rwsem_down_write_failed(struct rw_semaphore *sem); +extern struct rw_semaphore *rwsem_wake(struct rw_semaphore *); +extern struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *sem); + +/* Include the arch specific part */ +#include + +/* In all implementations count != 0 means locked */ +static inline int rwsem_is_locked(struct rw_semaphore *sem) +{ + return sem->count != 0; +} + +#endif + +/* Common initializer macros and functions */ + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define __RWSEM_DEP_MAP_INIT(lockname) , .dep_map = { .name = #lockname } +#else +# define __RWSEM_DEP_MAP_INIT(lockname) +#endif + +#ifdef CONFIG_RWSEM_SPIN_ON_OWNER +#define __RWSEM_OPT_INIT(lockname) , .osq = OSQ_LOCK_UNLOCKED, .owner = NULL +#else +#define __RWSEM_OPT_INIT(lockname) +#endif + +#define __RWSEM_INITIALIZER(name) \ + { .count = RWSEM_UNLOCKED_VALUE, \ + .wait_list = LIST_HEAD_INIT((name).wait_list), \ + .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock) \ + __RWSEM_OPT_INIT(name) \ + __RWSEM_DEP_MAP_INIT(name) } + +#define DECLARE_RWSEM(name) \ + struct rw_semaphore name = __RWSEM_INITIALIZER(name) + +extern void __init_rwsem(struct rw_semaphore *sem, const char *name, + struct lock_class_key *key); + +#define init_rwsem(sem) \ +do { \ + static struct lock_class_key __key; \ + \ + __init_rwsem((sem), #sem, &__key); \ +} while (0) + +/* + * This is the same regardless of which rwsem implementation that is being used. + * It is just a heuristic meant to be called by somebody alreadying holding the + * rwsem to see if somebody from an incompatible type is wanting access to the + * lock. + */ +static inline int rwsem_is_contended(struct rw_semaphore *sem) +{ + return !list_empty(&sem->wait_list); +} + +/* + * lock for reading + */ +extern void down_read(struct rw_semaphore *sem); + +/* + * trylock for reading -- returns 1 if successful, 0 if contention + */ +extern int down_read_trylock(struct rw_semaphore *sem); + +/* + * lock for writing + */ +extern void down_write(struct rw_semaphore *sem); + +/* + * trylock for writing -- returns 1 if successful, 0 if contention + */ +extern int down_write_trylock(struct rw_semaphore *sem); + +/* + * release a read lock + */ +extern void up_read(struct rw_semaphore *sem); + +/* + * release a write lock + */ +extern void up_write(struct rw_semaphore *sem); + +/* + * downgrade write lock to read lock + */ +extern void downgrade_write(struct rw_semaphore *sem); + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +/* + * nested locking. NOTE: rwsems are not allowed to recurse + * (which occurs if the same task tries to acquire the same + * lock instance multiple times), but multiple locks of the + * same lock class might be taken, if the order of the locks + * is always the same. This ordering rule can be expressed + * to lockdep via the _nested() APIs, but enumerating the + * subclasses that are used. (If the nesting relationship is + * static then another method for expressing nested locking is + * the explicit definition of lock class keys and the use of + * lockdep_set_class() at lock initialization time. + * See Documentation/locking/lockdep-design.txt for more details.) + */ +extern void down_read_nested(struct rw_semaphore *sem, int subclass); +extern void down_write_nested(struct rw_semaphore *sem, int subclass); +extern void _down_write_nest_lock(struct rw_semaphore *sem, struct lockdep_map *nest_lock); + +# define down_write_nest_lock(sem, nest_lock) \ +do { \ + typecheck(struct lockdep_map *, &(nest_lock)->dep_map); \ + _down_write_nest_lock(sem, &(nest_lock)->dep_map); \ +} while (0); + +/* + * Take/release a lock when not the owner will release it. + * + * [ This API should be avoided as much as possible - the + * proper abstraction for this case is completions. ] + */ +extern void down_read_non_owner(struct rw_semaphore *sem); +extern void up_read_non_owner(struct rw_semaphore *sem); +#else +# define down_read_nested(sem, subclass) down_read(sem) +# define down_write_nest_lock(sem, nest_lock) down_write(sem) +# define down_write_nested(sem, subclass) down_write(sem) +# define down_read_non_owner(sem) down_read(sem) +# define up_read_non_owner(sem) up_read(sem) +#endif + +#endif /* _LINUX_RWSEM_H */ diff --git a/drivers/include/linux/spinlock.h b/drivers/include/linux/spinlock.h index 96b4451231..ca9d27246e 100644 --- a/drivers/include/linux/spinlock.h +++ b/drivers/include/linux/spinlock.h @@ -47,13 +47,13 @@ */ #include -//#include +#include #include #include -//#include +#include #include #include -//#include +#include #include @@ -89,234 +89,322 @@ #endif #ifdef CONFIG_DEBUG_SPINLOCK - extern void __spin_lock_init(spinlock_t *lock, const char *name, + extern void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name, struct lock_class_key *key); -# define spin_lock_init(lock) \ +# define raw_spin_lock_init(lock) \ do { \ static struct lock_class_key __key; \ \ - __spin_lock_init((lock), #lock, &__key); \ + __raw_spin_lock_init((lock), #lock, &__key); \ } while (0) #else -# define spin_lock_init(lock) \ - do { *(lock) = __SPIN_LOCK_UNLOCKED(lock); } while (0) +# define raw_spin_lock_init(lock) \ + do { *(lock) = __RAW_SPIN_LOCK_UNLOCKED(lock); } while (0) #endif -#ifdef CONFIG_DEBUG_SPINLOCK - extern void __rwlock_init(rwlock_t *lock, const char *name, - struct lock_class_key *key); -# define rwlock_init(lock) \ -do { \ - static struct lock_class_key __key; \ - \ - __rwlock_init((lock), #lock, &__key); \ -} while (0) -#else -# define rwlock_init(lock) \ - do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0) -#endif - -#define spin_is_locked(lock) __raw_spin_is_locked(&(lock)->raw_lock) +#define raw_spin_is_locked(lock) arch_spin_is_locked(&(lock)->raw_lock) #ifdef CONFIG_GENERIC_LOCKBREAK -#define spin_is_contended(lock) ((lock)->break_lock) +#define raw_spin_is_contended(lock) ((lock)->break_lock) #else -#ifdef __raw_spin_is_contended -#define spin_is_contended(lock) __raw_spin_is_contended(&(lock)->raw_lock) +#ifdef arch_spin_is_contended +#define raw_spin_is_contended(lock) arch_spin_is_contended(&(lock)->raw_lock) #else -#define spin_is_contended(lock) (((void)(lock), 0)) -#endif /*__raw_spin_is_contended*/ +#define raw_spin_is_contended(lock) (((void)(lock), 0)) +#endif /*arch_spin_is_contended*/ #endif -/* The lock does not imply full memory barrier. */ -#ifndef ARCH_HAS_SMP_MB_AFTER_LOCK -static inline void smp_mb__after_lock(void) { smp_mb(); } +/* + * Despite its name it doesn't necessarily has to be a full barrier. + * It should only guarantee that a STORE before the critical section + * can not be reordered with a LOAD inside this section. + * spin_lock() is the one-way barrier, this LOAD can not escape out + * of the region. So the default implementation simply ensures that + * a STORE can not move into the critical section, smp_wmb() should + * serialize it with another STORE done by spin_lock(). + */ +#ifndef smp_mb__before_spinlock +#define smp_mb__before_spinlock() smp_wmb() +#endif + +/* + * Place this after a lock-acquisition primitive to guarantee that + * an UNLOCK+LOCK pair act as a full barrier. This guarantee applies + * if the UNLOCK and LOCK are executed by the same CPU or if the + * UNLOCK and LOCK operate on the same lock variable. + */ +#ifndef smp_mb__after_unlock_lock +#define smp_mb__after_unlock_lock() do { } while (0) #endif /** - * spin_unlock_wait - wait until the spinlock gets unlocked + * raw_spin_unlock_wait - wait until the spinlock gets unlocked * @lock: the spinlock in question. */ -#define spin_unlock_wait(lock) __raw_spin_unlock_wait(&(lock)->raw_lock) +#define raw_spin_unlock_wait(lock) arch_spin_unlock_wait(&(lock)->raw_lock) #ifdef CONFIG_DEBUG_SPINLOCK - extern void _raw_spin_lock(spinlock_t *lock); -#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock) - extern int _raw_spin_trylock(spinlock_t *lock); - extern void _raw_spin_unlock(spinlock_t *lock); - extern void _raw_read_lock(rwlock_t *lock); -#define _raw_read_lock_flags(lock, flags) _raw_read_lock(lock) - extern int _raw_read_trylock(rwlock_t *lock); - extern void _raw_read_unlock(rwlock_t *lock); - extern void _raw_write_lock(rwlock_t *lock); -#define _raw_write_lock_flags(lock, flags) _raw_write_lock(lock) - extern int _raw_write_trylock(rwlock_t *lock); - extern void _raw_write_unlock(rwlock_t *lock); + extern void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock); +#define do_raw_spin_lock_flags(lock, flags) do_raw_spin_lock(lock) + extern int do_raw_spin_trylock(raw_spinlock_t *lock); + extern void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock); #else -# define _raw_spin_lock(lock) __raw_spin_lock(&(lock)->raw_lock) -# define _raw_spin_lock_flags(lock, flags) \ - __raw_spin_lock_flags(&(lock)->raw_lock, *(flags)) -# define _raw_spin_trylock(lock) __raw_spin_trylock(&(lock)->raw_lock) -# define _raw_spin_unlock(lock) __raw_spin_unlock(&(lock)->raw_lock) -# define _raw_read_lock(rwlock) __raw_read_lock(&(rwlock)->raw_lock) -# define _raw_read_lock_flags(lock, flags) \ - __raw_read_lock_flags(&(lock)->raw_lock, *(flags)) -# define _raw_read_trylock(rwlock) __raw_read_trylock(&(rwlock)->raw_lock) -# define _raw_read_unlock(rwlock) __raw_read_unlock(&(rwlock)->raw_lock) -# define _raw_write_lock(rwlock) __raw_write_lock(&(rwlock)->raw_lock) -# define _raw_write_lock_flags(lock, flags) \ - __raw_write_lock_flags(&(lock)->raw_lock, *(flags)) -# define _raw_write_trylock(rwlock) __raw_write_trylock(&(rwlock)->raw_lock) -# define _raw_write_unlock(rwlock) __raw_write_unlock(&(rwlock)->raw_lock) -#endif +static inline void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock) +{ + __acquire(lock); + arch_spin_lock(&lock->raw_lock); +} -#define read_can_lock(rwlock) __raw_read_can_lock(&(rwlock)->raw_lock) -#define write_can_lock(rwlock) __raw_write_can_lock(&(rwlock)->raw_lock) +static inline void +do_raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long *flags) __acquires(lock) +{ + __acquire(lock); + arch_spin_lock_flags(&lock->raw_lock, *flags); +} + +static inline int do_raw_spin_trylock(raw_spinlock_t *lock) +{ + return arch_spin_trylock(&(lock)->raw_lock); +} + +static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock) +{ + arch_spin_unlock(&lock->raw_lock); + __release(lock); +} +#endif /* - * Define the various spin_lock and rw_lock methods. Note we define these - * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various - * methods are defined as nops in the case they are not required. + * Define the various spin_lock methods. Note we define these + * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The + * various methods are defined as nops in the case they are not + * required. */ -#define spin_trylock(lock) __cond_lock(lock, _spin_trylock(lock)) -#define read_trylock(lock) __cond_lock(lock, _read_trylock(lock)) -#define write_trylock(lock) __cond_lock(lock, _write_trylock(lock)) +#define raw_spin_trylock(lock) __cond_lock(lock, _raw_spin_trylock(lock)) -#define spin_lock(lock) _spin_lock(lock) +#define raw_spin_lock(lock) _raw_spin_lock(lock) #ifdef CONFIG_DEBUG_LOCK_ALLOC -# define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass) -# define spin_lock_nest_lock(lock, nest_lock) \ +# define raw_spin_lock_nested(lock, subclass) \ + _raw_spin_lock_nested(lock, subclass) + +# define raw_spin_lock_nest_lock(lock, nest_lock) \ do { \ typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\ - _spin_lock_nest_lock(lock, &(nest_lock)->dep_map); \ + _raw_spin_lock_nest_lock(lock, &(nest_lock)->dep_map); \ } while (0) #else -# define spin_lock_nested(lock, subclass) _spin_lock(lock) -# define spin_lock_nest_lock(lock, nest_lock) _spin_lock(lock) +/* + * Always evaluate the 'subclass' argument to avoid that the compiler + * warns about set-but-not-used variables when building with + * CONFIG_DEBUG_LOCK_ALLOC=n and with W=1. + */ +# define raw_spin_lock_nested(lock, subclass) \ + _raw_spin_lock(((void)(subclass), (lock))) +# define raw_spin_lock_nest_lock(lock, nest_lock) _raw_spin_lock(lock) #endif -#define write_lock(lock) _write_lock(lock) -#define read_lock(lock) _read_lock(lock) - #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) -#define spin_lock_irqsave(lock, flags) \ +#define raw_spin_lock_irqsave(lock, flags) \ do { \ typecheck(unsigned long, flags); \ - flags = _spin_lock_irqsave(lock); \ - } while (0) -#define read_lock_irqsave(lock, flags) \ - do { \ - typecheck(unsigned long, flags); \ - flags = _read_lock_irqsave(lock); \ - } while (0) -#define write_lock_irqsave(lock, flags) \ - do { \ - typecheck(unsigned long, flags); \ - flags = _write_lock_irqsave(lock); \ + flags = _raw_spin_lock_irqsave(lock); \ } while (0) #ifdef CONFIG_DEBUG_LOCK_ALLOC -#define spin_lock_irqsave_nested(lock, flags, subclass) \ +#define raw_spin_lock_irqsave_nested(lock, flags, subclass) \ do { \ typecheck(unsigned long, flags); \ - flags = _spin_lock_irqsave_nested(lock, subclass); \ + flags = _raw_spin_lock_irqsave_nested(lock, subclass); \ } while (0) #else -#define spin_lock_irqsave_nested(lock, flags, subclass) \ +#define raw_spin_lock_irqsave_nested(lock, flags, subclass) \ do { \ typecheck(unsigned long, flags); \ - flags = _spin_lock_irqsave(lock); \ + flags = _raw_spin_lock_irqsave(lock); \ } while (0) #endif #else -#define spin_lock_irqsave(lock, flags) \ +#define raw_spin_lock_irqsave(lock, flags) \ do { \ typecheck(unsigned long, flags); \ - _spin_lock_irqsave(lock, flags); \ + _raw_spin_lock_irqsave(lock, flags); \ } while (0) -#define read_lock_irqsave(lock, flags) \ - do { \ - typecheck(unsigned long, flags); \ - _read_lock_irqsave(lock, flags); \ - } while (0) -#define write_lock_irqsave(lock, flags) \ - do { \ - typecheck(unsigned long, flags); \ - _write_lock_irqsave(lock, flags); \ - } while (0) -#define spin_lock_irqsave_nested(lock, flags, subclass) \ - spin_lock_irqsave(lock, flags) + +#define raw_spin_lock_irqsave_nested(lock, flags, subclass) \ + raw_spin_lock_irqsave(lock, flags) #endif -#define spin_lock_irq(lock) _spin_lock_irq(lock) -#define spin_lock_bh(lock) _spin_lock_bh(lock) -#define read_lock_irq(lock) _read_lock_irq(lock) -#define read_lock_bh(lock) _read_lock_bh(lock) -#define write_lock_irq(lock) _write_lock_irq(lock) -#define write_lock_bh(lock) _write_lock_bh(lock) -#define spin_unlock(lock) _spin_unlock(lock) -#define read_unlock(lock) _read_unlock(lock) -#define write_unlock(lock) _write_unlock(lock) -#define spin_unlock_irq(lock) _spin_unlock_irq(lock) -#define read_unlock_irq(lock) _read_unlock_irq(lock) -#define write_unlock_irq(lock) _write_unlock_irq(lock) +#define raw_spin_lock_irq(lock) _raw_spin_lock_irq(lock) +#define raw_spin_lock_bh(lock) _raw_spin_lock_bh(lock) +#define raw_spin_unlock(lock) _raw_spin_unlock(lock) +#define raw_spin_unlock_irq(lock) _raw_spin_unlock_irq(lock) -#define spin_unlock_irqrestore(lock, flags) \ +#define raw_spin_unlock_irqrestore(lock, flags) \ do { \ typecheck(unsigned long, flags); \ - _spin_unlock_irqrestore(lock, flags); \ + _raw_spin_unlock_irqrestore(lock, flags); \ } while (0) -#define spin_unlock_bh(lock) _spin_unlock_bh(lock) +#define raw_spin_unlock_bh(lock) _raw_spin_unlock_bh(lock) -#define read_unlock_irqrestore(lock, flags) \ - do { \ - typecheck(unsigned long, flags); \ - _read_unlock_irqrestore(lock, flags); \ - } while (0) -#define read_unlock_bh(lock) _read_unlock_bh(lock) +#define raw_spin_trylock_bh(lock) \ + __cond_lock(lock, _raw_spin_trylock_bh(lock)) -#define write_unlock_irqrestore(lock, flags) \ - do { \ - typecheck(unsigned long, flags); \ - _write_unlock_irqrestore(lock, flags); \ - } while (0) -#define write_unlock_bh(lock) _write_unlock_bh(lock) - -#define spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock)) - -#define spin_trylock_irq(lock) \ +#define raw_spin_trylock_irq(lock) \ ({ \ local_irq_disable(); \ - spin_trylock(lock) ? \ + raw_spin_trylock(lock) ? \ 1 : ({ local_irq_enable(); 0; }); \ }) -#define spin_trylock_irqsave(lock, flags) \ +#define raw_spin_trylock_irqsave(lock, flags) \ ({ \ local_irq_save(flags); \ - spin_trylock(lock) ? \ + raw_spin_trylock(lock) ? \ 1 : ({ local_irq_restore(flags); 0; }); \ }) -#define write_trylock_irqsave(lock, flags) \ +/** + * raw_spin_can_lock - would raw_spin_trylock() succeed? + * @lock: the spinlock in question. + */ +#define raw_spin_can_lock(lock) (!raw_spin_is_locked(lock)) + +/* Include rwlock functions */ +#include + +/* + * Pull the _spin_*()/_read_*()/_write_*() functions/declarations: + */ +#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) +# include +#else +# include +#endif + +/* + * Map the spin_lock functions to the raw variants for PREEMPT_RT=n + */ + +static inline raw_spinlock_t *spinlock_check(spinlock_t *lock) +{ + return &lock->rlock; +} + +#define spin_lock_init(_lock) \ +do { \ + spinlock_check(_lock); \ + raw_spin_lock_init(&(_lock)->rlock); \ +} while (0) + +static inline void spin_lock(spinlock_t *lock) +{ + raw_spin_lock(&lock->rlock); +} + +static inline void spin_lock_bh(spinlock_t *lock) +{ + raw_spin_lock_bh(&lock->rlock); +} + +static inline int spin_trylock(spinlock_t *lock) +{ + return raw_spin_trylock(&lock->rlock); +} + +#define spin_lock_nested(lock, subclass) \ +do { \ + raw_spin_lock_nested(spinlock_check(lock), subclass); \ +} while (0) + +#define spin_lock_nest_lock(lock, nest_lock) \ +do { \ + raw_spin_lock_nest_lock(spinlock_check(lock), nest_lock); \ +} while (0) + +static inline void spin_lock_irq(spinlock_t *lock) +{ + raw_spin_lock_irq(&lock->rlock); +} + +#define spin_lock_irqsave(lock, flags) \ +do { \ + raw_spin_lock_irqsave(spinlock_check(lock), flags); \ +} while (0) + +#define spin_lock_irqsave_nested(lock, flags, subclass) \ +do { \ + raw_spin_lock_irqsave_nested(spinlock_check(lock), flags, subclass); \ +} while (0) + +static inline void spin_unlock(spinlock_t *lock) +{ + raw_spin_unlock(&lock->rlock); +} + +static inline void spin_unlock_bh(spinlock_t *lock) +{ + raw_spin_unlock_bh(&lock->rlock); +} + +static inline void spin_unlock_irq(spinlock_t *lock) +{ + raw_spin_unlock_irq(&lock->rlock); +} + +static inline void spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags) +{ + raw_spin_unlock_irqrestore(&lock->rlock, flags); +} + +static inline int spin_trylock_bh(spinlock_t *lock) +{ + return raw_spin_trylock_bh(&lock->rlock); +} + +static inline int spin_trylock_irq(spinlock_t *lock) +{ + return raw_spin_trylock_irq(&lock->rlock); +} + +#define spin_trylock_irqsave(lock, flags) \ ({ \ - local_irq_save(flags); \ - write_trylock(lock) ? \ - 1 : ({ local_irq_restore(flags); 0; }); \ + raw_spin_trylock_irqsave(spinlock_check(lock), flags); \ }) +static inline void spin_unlock_wait(spinlock_t *lock) +{ + raw_spin_unlock_wait(&lock->rlock); +} + +static inline int spin_is_locked(spinlock_t *lock) +{ + return raw_spin_is_locked(&lock->rlock); +} + +static inline int spin_is_contended(spinlock_t *lock) +{ + return raw_spin_is_contended(&lock->rlock); +} + +static inline int spin_can_lock(spinlock_t *lock) +{ + return raw_spin_can_lock(&lock->rlock); +} + +#define assert_spin_locked(lock) assert_raw_spin_locked(&(lock)->rlock) + /* * Pull the atomic_t declaration: * (asm-mips/atomic.h needs above definitions) */ -#include +#include /** * atomic_dec_and_lock - lock on reaching reference count zero * @atomic: the atomic counter @@ -329,25 +417,4 @@ extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock); #define atomic_dec_and_lock(atomic, lock) \ __cond_lock(lock, _atomic_dec_and_lock(atomic, lock)) -/** - * spin_can_lock - would spin_trylock() succeed? - * @lock: the spinlock in question. - */ -#define spin_can_lock(lock) (!spin_is_locked(lock)) - -/* - * Pull the _spin_*()/_read_*()/_write_*() functions/declarations: - */ -#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) -# include -#else -# include -#endif - -struct rw_semaphore { - signed long count; - spinlock_t wait_lock; - struct list_head wait_list; -}; - #endif /* __LINUX_SPINLOCK_H */ diff --git a/drivers/include/linux/spinlock_api_up.h b/drivers/include/linux/spinlock_api_up.h index 7ee00cc9a4..eb5ea06fff 100644 --- a/drivers/include/linux/spinlock_api_up.h +++ b/drivers/include/linux/spinlock_api_up.h @@ -24,70 +24,68 @@ * flags straight, to suppress compiler warnings of unused lock * variables, and to add the proper checker annotations: */ +#define ___LOCK(lock) \ + do { __acquire(lock); (void)(lock); } while (0) + #define __LOCK(lock) \ - do { preempt_disable(); __acquire(lock); (void)(lock); } while (0) + do { preempt_disable(); ___LOCK(lock); } while (0) #define __LOCK_BH(lock) \ - do { local_bh_disable(); __LOCK(lock); } while (0) + do { __local_bh_disable_ip(_THIS_IP_, SOFTIRQ_LOCK_OFFSET); ___LOCK(lock); } while (0) #define __LOCK_IRQ(lock) \ - do { asm volatile ("cli \n"); __LOCK(lock); } while (0) + do { local_irq_disable(); __LOCK(lock); } while (0) #define __LOCK_IRQSAVE(lock, flags) \ - do { \ - __asm__ __volatile__ ( \ - "pushf\n\t" \ - "popl %0\n\t" \ - "cli\n" \ - : "=r" (flags)); \ - __LOCK(lock); \ - } while (0) \ + do { local_irq_save(flags); __LOCK(lock); } while (0) + +#define ___UNLOCK(lock) \ + do { __release(lock); (void)(lock); } while (0) #define __UNLOCK(lock) \ - do { preempt_enable(); __release(lock); (void)(lock); } while (0) + do { preempt_enable(); ___UNLOCK(lock); } while (0) #define __UNLOCK_BH(lock) \ - do { preempt_enable_no_resched(); local_bh_enable(); \ - __release(lock); (void)(lock); } while (0) + do { __local_bh_enable_ip(_THIS_IP_, SOFTIRQ_LOCK_OFFSET); \ + ___UNLOCK(lock); } while (0) #define __UNLOCK_IRQ(lock) \ - do { asm volatile ("sti \n"); __UNLOCK(lock); } while (0) + do { local_irq_enable(); __UNLOCK(lock); } while (0) #define __UNLOCK_IRQRESTORE(lock, flags) \ - do { \ - if (flags & (1<<9)) \ - __asm__ __volatile__ ("sti"); \ - __UNLOCK(lock); \ - } while (0) + do { local_irq_restore(flags); __UNLOCK(lock); } while (0) -#define _spin_lock(lock) __LOCK(lock) -#define _spin_lock_nested(lock, subclass) __LOCK(lock) -#define _read_lock(lock) __LOCK(lock) -#define _write_lock(lock) __LOCK(lock) -#define _spin_lock_bh(lock) __LOCK_BH(lock) -#define _read_lock_bh(lock) __LOCK_BH(lock) -#define _write_lock_bh(lock) __LOCK_BH(lock) -#define _spin_lock_irq(lock) __LOCK_IRQ(lock) -#define _read_lock_irq(lock) __LOCK_IRQ(lock) -#define _write_lock_irq(lock) __LOCK_IRQ(lock) -#define _spin_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags) -#define _read_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags) -#define _write_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags) -#define _spin_trylock(lock) ({ __LOCK(lock); 1; }) -#define _read_trylock(lock) ({ __LOCK(lock); 1; }) -#define _write_trylock(lock) ({ __LOCK(lock); 1; }) -#define _spin_trylock_bh(lock) ({ __LOCK_BH(lock); 1; }) -#define _spin_unlock(lock) __UNLOCK(lock) -#define _read_unlock(lock) __UNLOCK(lock) -#define _write_unlock(lock) __UNLOCK(lock) -#define _spin_unlock_bh(lock) __UNLOCK_BH(lock) -#define _write_unlock_bh(lock) __UNLOCK_BH(lock) -#define _read_unlock_bh(lock) __UNLOCK_BH(lock) -#define _spin_unlock_irq(lock) __UNLOCK_IRQ(lock) -#define _read_unlock_irq(lock) __UNLOCK_IRQ(lock) -#define _write_unlock_irq(lock) __UNLOCK_IRQ(lock) -#define _spin_unlock_irqrestore(lock, flags) __UNLOCK_IRQRESTORE(lock, flags) -#define _read_unlock_irqrestore(lock, flags) __UNLOCK_IRQRESTORE(lock, flags) -#define _write_unlock_irqrestore(lock, flags) __UNLOCK_IRQRESTORE(lock, flags) +#define _raw_spin_lock(lock) __LOCK(lock) +#define _raw_spin_lock_nested(lock, subclass) __LOCK(lock) +#define _raw_read_lock(lock) __LOCK(lock) +#define _raw_write_lock(lock) __LOCK(lock) +#define _raw_spin_lock_bh(lock) __LOCK_BH(lock) +#define _raw_read_lock_bh(lock) __LOCK_BH(lock) +#define _raw_write_lock_bh(lock) __LOCK_BH(lock) +#define _raw_spin_lock_irq(lock) __LOCK_IRQ(lock) +#define _raw_read_lock_irq(lock) __LOCK_IRQ(lock) +#define _raw_write_lock_irq(lock) __LOCK_IRQ(lock) +#define _raw_spin_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags) +#define _raw_read_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags) +#define _raw_write_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags) +#define _raw_spin_trylock(lock) ({ __LOCK(lock); 1; }) +#define _raw_read_trylock(lock) ({ __LOCK(lock); 1; }) +#define _raw_write_trylock(lock) ({ __LOCK(lock); 1; }) +#define _raw_spin_trylock_bh(lock) ({ __LOCK_BH(lock); 1; }) +#define _raw_spin_unlock(lock) __UNLOCK(lock) +#define _raw_read_unlock(lock) __UNLOCK(lock) +#define _raw_write_unlock(lock) __UNLOCK(lock) +#define _raw_spin_unlock_bh(lock) __UNLOCK_BH(lock) +#define _raw_write_unlock_bh(lock) __UNLOCK_BH(lock) +#define _raw_read_unlock_bh(lock) __UNLOCK_BH(lock) +#define _raw_spin_unlock_irq(lock) __UNLOCK_IRQ(lock) +#define _raw_read_unlock_irq(lock) __UNLOCK_IRQ(lock) +#define _raw_write_unlock_irq(lock) __UNLOCK_IRQ(lock) +#define _raw_spin_unlock_irqrestore(lock, flags) \ + __UNLOCK_IRQRESTORE(lock, flags) +#define _raw_read_unlock_irqrestore(lock, flags) \ + __UNLOCK_IRQRESTORE(lock, flags) +#define _raw_write_unlock_irqrestore(lock, flags) \ + __UNLOCK_IRQRESTORE(lock, flags) #endif /* __LINUX_SPINLOCK_API_UP_H */ diff --git a/drivers/include/linux/spinlock_types.h b/drivers/include/linux/spinlock_types.h index e29802650f..c1a720aa26 100644 --- a/drivers/include/linux/spinlock_types.h +++ b/drivers/include/linux/spinlock_types.h @@ -17,8 +17,8 @@ #include -typedef struct spinlock { - raw_spinlock_t raw_lock; +typedef struct raw_spinlock { + arch_spinlock_t raw_lock; #ifdef CONFIG_GENERIC_LOCKBREAK unsigned int break_lock; #endif @@ -29,26 +29,10 @@ typedef struct spinlock { #ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map dep_map; #endif -} spinlock_t; +} raw_spinlock_t; #define SPINLOCK_MAGIC 0xdead4ead -typedef struct { - raw_rwlock_t raw_lock; -#ifdef CONFIG_GENERIC_LOCKBREAK - unsigned int break_lock; -#endif -#ifdef CONFIG_DEBUG_SPINLOCK - unsigned int magic, owner_cpu; - void *owner; -#endif -#ifdef CONFIG_DEBUG_LOCK_ALLOC - struct lockdep_map dep_map; -#endif -} rwlock_t; - -#define RWLOCK_MAGIC 0xdeaf1eed - #define SPINLOCK_OWNER_INIT ((void *)-1L) #ifdef CONFIG_DEBUG_LOCK_ALLOC @@ -57,44 +41,48 @@ typedef struct { # define SPIN_DEP_MAP_INIT(lockname) #endif -#ifdef CONFIG_DEBUG_LOCK_ALLOC -# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname } -#else -# define RW_DEP_MAP_INIT(lockname) -#endif - #ifdef CONFIG_DEBUG_SPINLOCK -# define __SPIN_LOCK_UNLOCKED(lockname) \ - (spinlock_t) { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \ +# define SPIN_DEBUG_INIT(lockname) \ .magic = SPINLOCK_MAGIC, \ - .owner = SPINLOCK_OWNER_INIT, \ .owner_cpu = -1, \ - SPIN_DEP_MAP_INIT(lockname) } -#define __RW_LOCK_UNLOCKED(lockname) \ - (rwlock_t) { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \ - .magic = RWLOCK_MAGIC, \ - .owner = SPINLOCK_OWNER_INIT, \ - .owner_cpu = -1, \ - RW_DEP_MAP_INIT(lockname) } + .owner = SPINLOCK_OWNER_INIT, #else -# define __SPIN_LOCK_UNLOCKED(lockname) \ - (spinlock_t) { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \ - SPIN_DEP_MAP_INIT(lockname) } -#define __RW_LOCK_UNLOCKED(lockname) \ - (rwlock_t) { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \ - RW_DEP_MAP_INIT(lockname) } +# define SPIN_DEBUG_INIT(lockname) #endif -/* - * SPIN_LOCK_UNLOCKED and RW_LOCK_UNLOCKED defeat lockdep state tracking and - * are hence deprecated. - * Please use DEFINE_SPINLOCK()/DEFINE_RWLOCK() or - * __SPIN_LOCK_UNLOCKED()/__RW_LOCK_UNLOCKED() as appropriate. - */ -#define SPIN_LOCK_UNLOCKED __SPIN_LOCK_UNLOCKED(old_style_spin_init) -#define RW_LOCK_UNLOCKED __RW_LOCK_UNLOCKED(old_style_rw_init) +#define __RAW_SPIN_LOCK_INITIALIZER(lockname) \ + { \ + .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \ + SPIN_DEBUG_INIT(lockname) \ + SPIN_DEP_MAP_INIT(lockname) } + +#define __RAW_SPIN_LOCK_UNLOCKED(lockname) \ + (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname) + +#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x) + +typedef struct spinlock { + union { + struct raw_spinlock rlock; + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map)) + struct { + u8 __padding[LOCK_PADSIZE]; + struct lockdep_map dep_map; + }; +#endif + }; +} spinlock_t; + +#define __SPIN_LOCK_INITIALIZER(lockname) \ + { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } } + +#define __SPIN_LOCK_UNLOCKED(lockname) \ + (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname) #define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x) -#define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x) + +#include #endif /* __LINUX_SPINLOCK_TYPES_H */ diff --git a/drivers/include/linux/spinlock_types_up.h b/drivers/include/linux/spinlock_types_up.h index 60c6355efc..e862b1ac3a 100644 --- a/drivers/include/linux/spinlock_types_up.h +++ b/drivers/include/linux/spinlock_types_up.h @@ -16,22 +16,22 @@ typedef struct { volatile unsigned int slock; -} raw_spinlock_t; +} arch_spinlock_t; -#define __RAW_SPIN_LOCK_UNLOCKED { 1 } +#define __ARCH_SPIN_LOCK_UNLOCKED { 1 } #else -typedef struct { } raw_spinlock_t; +typedef struct { } arch_spinlock_t; -#define __RAW_SPIN_LOCK_UNLOCKED { } +#define __ARCH_SPIN_LOCK_UNLOCKED { } #endif typedef struct { /* no debug version on UP */ -} raw_rwlock_t; +} arch_rwlock_t; -#define __RAW_RW_LOCK_UNLOCKED { } +#define __ARCH_RW_LOCK_UNLOCKED { } #endif /* __LINUX_SPINLOCK_TYPES_UP_H */ diff --git a/drivers/include/linux/spinlock_up.h b/drivers/include/linux/spinlock_up.h index 5035e2320c..6c970c6eb3 100644 --- a/drivers/include/linux/spinlock_up.h +++ b/drivers/include/linux/spinlock_up.h @@ -5,6 +5,8 @@ # error "please don't include this file directly" #endif +#include /* for cpu_relax() */ + /* * include/linux/spinlock_up.h - UP-debug version of spinlocks. * @@ -21,59 +23,63 @@ */ #ifdef CONFIG_DEBUG_SPINLOCK -#define __raw_spin_is_locked(x) ((x)->slock == 0) +#define arch_spin_is_locked(x) ((x)->slock == 0) -static inline void __raw_spin_lock(raw_spinlock_t *lock) +static inline void arch_spin_lock(arch_spinlock_t *lock) { lock->slock = 0; + barrier(); } static inline void -__raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags) +arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags) { local_irq_save(flags); lock->slock = 0; + barrier(); } -static inline int __raw_spin_trylock(raw_spinlock_t *lock) +static inline int arch_spin_trylock(arch_spinlock_t *lock) { char oldval = lock->slock; lock->slock = 0; + barrier(); return oldval > 0; } -static inline void __raw_spin_unlock(raw_spinlock_t *lock) +static inline void arch_spin_unlock(arch_spinlock_t *lock) { + barrier(); lock->slock = 1; } /* * Read-write spinlocks. No debug version. */ -#define __raw_read_lock(lock) do { (void)(lock); } while (0) -#define __raw_write_lock(lock) do { (void)(lock); } while (0) -#define __raw_read_trylock(lock) ({ (void)(lock); 1; }) -#define __raw_write_trylock(lock) ({ (void)(lock); 1; }) -#define __raw_read_unlock(lock) do { (void)(lock); } while (0) -#define __raw_write_unlock(lock) do { (void)(lock); } while (0) +#define arch_read_lock(lock) do { barrier(); (void)(lock); } while (0) +#define arch_write_lock(lock) do { barrier(); (void)(lock); } while (0) +#define arch_read_trylock(lock) ({ barrier(); (void)(lock); 1; }) +#define arch_write_trylock(lock) ({ barrier(); (void)(lock); 1; }) +#define arch_read_unlock(lock) do { barrier(); (void)(lock); } while (0) +#define arch_write_unlock(lock) do { barrier(); (void)(lock); } while (0) #else /* DEBUG_SPINLOCK */ -#define __raw_spin_is_locked(lock) ((void)(lock), 0) -/* for sched.c and kernel_lock.c: */ -# define __raw_spin_lock(lock) do { (void)(lock); } while (0) -# define __raw_spin_lock_flags(lock, flags) do { (void)(lock); } while (0) -# define __raw_spin_unlock(lock) do { (void)(lock); } while (0) -# define __raw_spin_trylock(lock) ({ (void)(lock); 1; }) +#define arch_spin_is_locked(lock) ((void)(lock), 0) +/* for sched/core.c and kernel_lock.c: */ +# define arch_spin_lock(lock) do { barrier(); (void)(lock); } while (0) +# define arch_spin_lock_flags(lock, flags) do { barrier(); (void)(lock); } while (0) +# define arch_spin_unlock(lock) do { barrier(); (void)(lock); } while (0) +# define arch_spin_trylock(lock) ({ barrier(); (void)(lock); 1; }) #endif /* DEBUG_SPINLOCK */ -#define __raw_spin_is_contended(lock) (((void)(lock), 0)) +#define arch_spin_is_contended(lock) (((void)(lock), 0)) -#define __raw_read_can_lock(lock) (((void)(lock), 1)) -#define __raw_write_can_lock(lock) (((void)(lock), 1)) +#define arch_read_can_lock(lock) (((void)(lock), 1)) +#define arch_write_can_lock(lock) (((void)(lock), 1)) -#define __raw_spin_unlock_wait(lock) \ - do { cpu_relax(); } while (__raw_spin_is_locked(lock)) +#define arch_spin_unlock_wait(lock) \ + do { cpu_relax(); } while (arch_spin_is_locked(lock)) #endif /* __LINUX_SPINLOCK_UP_H */ diff --git a/drivers/include/linux/uuid.h b/drivers/include/linux/uuid.h index 786f0773cc..6df2509033 100644 --- a/drivers/include/linux/uuid.h +++ b/drivers/include/linux/uuid.h @@ -17,42 +17,23 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +#ifndef _LINUX_UUID_H_ +#define _LINUX_UUID_H_ -#ifndef _UAPI_LINUX_UUID_H_ -#define _UAPI_LINUX_UUID_H_ - -#include -#include - -typedef struct { - __u8 b[16]; -} uuid_le; - -typedef struct { - __u8 b[16]; -} uuid_be; - -#define UUID_LE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \ -((uuid_le) \ -{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \ - (b) & 0xff, ((b) >> 8) & 0xff, \ - (c) & 0xff, ((c) >> 8) & 0xff, \ - (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }}) - -#define UUID_BE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \ -((uuid_be) \ -{{ ((a) >> 24) & 0xff, ((a) >> 16) & 0xff, ((a) >> 8) & 0xff, (a) & 0xff, \ - ((b) >> 8) & 0xff, (b) & 0xff, \ - ((c) >> 8) & 0xff, (c) & 0xff, \ - (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }}) - -#define NULL_UUID_LE \ - UUID_LE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, \ - 0x00, 0x00, 0x00, 0x00) - -#define NULL_UUID_BE \ - UUID_BE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, \ - 0x00, 0x00, 0x00, 0x00) +#include -#endif /* _UAPI_LINUX_UUID_H_ */ +static inline int uuid_le_cmp(const uuid_le u1, const uuid_le u2) +{ + return memcmp(&u1, &u2, sizeof(uuid_le)); +} + +static inline int uuid_be_cmp(const uuid_be u1, const uuid_be u2) +{ + return memcmp(&u1, &u2, sizeof(uuid_be)); +} + +extern void uuid_le_gen(uuid_le *u); +extern void uuid_be_gen(uuid_be *u); + +#endif diff --git a/drivers/include/linux/workqueue.h b/drivers/include/linux/workqueue.h index d68b062447..7ca4c5e84f 100644 --- a/drivers/include/linux/workqueue.h +++ b/drivers/include/linux/workqueue.h @@ -9,6 +9,7 @@ #include #include #include +#include #include struct workqueue_struct; diff --git a/drivers/include/syscall.h b/drivers/include/syscall.h index df9586e81a..43a925639b 100644 --- a/drivers/include/syscall.h +++ b/drivers/include/syscall.h @@ -543,19 +543,5 @@ static inline void vfree(void *addr) static inline int power_supply_is_system_supplied(void) { return -1; } -#define RWSEM_UNLOCKED_VALUE 0x00000000 -#define RWSEM_ACTIVE_BIAS 0x00000001 -#define RWSEM_ACTIVE_MASK 0x0000ffff -#define RWSEM_WAITING_BIAS (-0x00010000) -#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS -#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS) - - -//static void init_rwsem(struct rw_semaphore *sem) -//{ -// sem->count = RWSEM_UNLOCKED_VALUE; -// spin_lock_init(&sem->wait_lock); -// INIT_LIST_HEAD(&sem->wait_list); -//} #endif diff --git a/drivers/include/uapi/drm/drm.h b/drivers/include/uapi/drm/drm.h index e988f79603..9634a1bce0 100644 --- a/drivers/include/uapi/drm/drm.h +++ b/drivers/include/uapi/drm/drm.h @@ -39,7 +39,7 @@ #if defined(__KERNEL__) || defined(__linux__) #include -//#include +#include typedef unsigned int drm_handle_t; #else /* One of the BSDs */ diff --git a/drivers/include/uapi/linux/uuid.h b/drivers/include/uapi/linux/uuid.h new file mode 100644 index 0000000000..786f0773cc --- /dev/null +++ b/drivers/include/uapi/linux/uuid.h @@ -0,0 +1,58 @@ +/* + * UUID/GUID definition + * + * Copyright (C) 2010, Intel Corp. + * Huang Ying + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation; + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef _UAPI_LINUX_UUID_H_ +#define _UAPI_LINUX_UUID_H_ + +#include +#include + +typedef struct { + __u8 b[16]; +} uuid_le; + +typedef struct { + __u8 b[16]; +} uuid_be; + +#define UUID_LE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \ +((uuid_le) \ +{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \ + (b) & 0xff, ((b) >> 8) & 0xff, \ + (c) & 0xff, ((c) >> 8) & 0xff, \ + (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }}) + +#define UUID_BE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \ +((uuid_be) \ +{{ ((a) >> 24) & 0xff, ((a) >> 16) & 0xff, ((a) >> 8) & 0xff, (a) & 0xff, \ + ((b) >> 8) & 0xff, (b) & 0xff, \ + ((c) >> 8) & 0xff, (c) & 0xff, \ + (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }}) + +#define NULL_UUID_LE \ + UUID_LE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, \ + 0x00, 0x00, 0x00, 0x00) + +#define NULL_UUID_BE \ + UUID_BE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, \ + 0x00, 0x00, 0x00, 0x00) + + +#endif /* _UAPI_LINUX_UUID_H_ */