summaryrefslogtreecommitdiffstats
path: root/kernel/futex/futex.h
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--kernel/futex/futex.h106
1 files changed, 99 insertions, 7 deletions
diff --git a/kernel/futex/futex.h b/kernel/futex/futex.h
index b5379c0e6d..8b195d06f4 100644
--- a/kernel/futex/futex.h
+++ b/kernel/futex/futex.h
@@ -5,6 +5,7 @@
#include <linux/futex.h>
#include <linux/rtmutex.h>
#include <linux/sched/wake_q.h>
+#include <linux/compat.h>
#ifdef CONFIG_PREEMPT_RT
#include <linux/rcuwait.h>
@@ -16,17 +17,86 @@
* Futex flags used to encode options to functions and preserve them across
* restarts.
*/
+#define FLAGS_SIZE_8 0x0000
+#define FLAGS_SIZE_16 0x0001
+#define FLAGS_SIZE_32 0x0002
+#define FLAGS_SIZE_64 0x0003
+
+#define FLAGS_SIZE_MASK 0x0003
+
#ifdef CONFIG_MMU
-# define FLAGS_SHARED 0x01
+# define FLAGS_SHARED 0x0010
#else
/*
* NOMMU does not have per process address space. Let the compiler optimize
* code away.
*/
-# define FLAGS_SHARED 0x00
+# define FLAGS_SHARED 0x0000
#endif
-#define FLAGS_CLOCKRT 0x02
-#define FLAGS_HAS_TIMEOUT 0x04
+#define FLAGS_CLOCKRT 0x0020
+#define FLAGS_HAS_TIMEOUT 0x0040
+#define FLAGS_NUMA 0x0080
+#define FLAGS_STRICT 0x0100
+
+/* FUTEX_ to FLAGS_ */
+static inline unsigned int futex_to_flags(unsigned int op)
+{
+ unsigned int flags = FLAGS_SIZE_32;
+
+ if (!(op & FUTEX_PRIVATE_FLAG))
+ flags |= FLAGS_SHARED;
+
+ if (op & FUTEX_CLOCK_REALTIME)
+ flags |= FLAGS_CLOCKRT;
+
+ return flags;
+}
+
+#define FUTEX2_VALID_MASK (FUTEX2_SIZE_MASK | FUTEX2_PRIVATE)
+
+/* FUTEX2_ to FLAGS_ */
+static inline unsigned int futex2_to_flags(unsigned int flags2)
+{
+ unsigned int flags = flags2 & FUTEX2_SIZE_MASK;
+
+ if (!(flags2 & FUTEX2_PRIVATE))
+ flags |= FLAGS_SHARED;
+
+ if (flags2 & FUTEX2_NUMA)
+ flags |= FLAGS_NUMA;
+
+ return flags;
+}
+
+static inline unsigned int futex_size(unsigned int flags)
+{
+ return 1 << (flags & FLAGS_SIZE_MASK);
+}
+
+static inline bool futex_flags_valid(unsigned int flags)
+{
+ /* Only 64bit futexes for 64bit code */
+ if (!IS_ENABLED(CONFIG_64BIT) || in_compat_syscall()) {
+ if ((flags & FLAGS_SIZE_MASK) == FLAGS_SIZE_64)
+ return false;
+ }
+
+ /* Only 32bit futexes are implemented -- for now */
+ if ((flags & FLAGS_SIZE_MASK) != FLAGS_SIZE_32)
+ return false;
+
+ return true;
+}
+
+static inline bool futex_validate_input(unsigned int flags, u64 val)
+{
+ int bits = 8 * futex_size(flags);
+
+ if (bits < 64 && (val >> bits))
+ return false;
+
+ return true;
+}
#ifdef CONFIG_FAIL_FUTEX
extern bool should_fail_futex(bool fshared);
@@ -69,11 +139,16 @@ struct futex_pi_state {
union futex_key key;
} __randomize_layout;
+struct futex_q;
+typedef void (futex_wake_fn)(struct wake_q_head *wake_q, struct futex_q *q);
+
/**
* struct futex_q - The hashed futex queue entry, one per waiting task
* @list: priority-sorted list of tasks waiting on this futex
* @task: the task waiting on the futex
* @lock_ptr: the hash bucket lock
+ * @wake: the wake handler for this queue
+ * @wake_data: data associated with the wake handler
* @key: the key the futex is hashed on
* @pi_state: optional priority inheritance state
* @rt_waiter: rt_waiter storage for use with requeue_pi
@@ -98,6 +173,8 @@ struct futex_q {
struct task_struct *task;
spinlock_t *lock_ptr;
+ futex_wake_fn *wake;
+ void *wake_data;
union futex_key key;
struct futex_pi_state *pi_state;
struct rt_mutex_waiter *rt_waiter;
@@ -116,7 +193,7 @@ enum futex_access {
FUTEX_WRITE
};
-extern int get_futex_key(u32 __user *uaddr, bool fshared, union futex_key *key,
+extern int get_futex_key(u32 __user *uaddr, unsigned int flags, union futex_key *key,
enum futex_access rw);
extern struct hrtimer_sleeper *
@@ -144,6 +221,7 @@ extern int futex_wait_setup(u32 __user *uaddr, u32 val, unsigned int flags,
struct futex_q *q, struct futex_hash_bucket **hb);
extern void futex_wait_queue(struct futex_hash_bucket *hb, struct futex_q *q,
struct hrtimer_sleeper *timeout);
+extern bool __futex_wake_mark(struct futex_q *q);
extern void futex_wake_mark(struct wake_q_head *wake_q, struct futex_q *q);
extern int fault_in_user_writeable(u32 __user *uaddr);
@@ -260,10 +338,14 @@ extern int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, u32
val, ktime_t *abs_time, u32 bitset, u32 __user
*uaddr2);
-extern int futex_requeue(u32 __user *uaddr1, unsigned int flags,
- u32 __user *uaddr2, int nr_wake, int nr_requeue,
+extern int futex_requeue(u32 __user *uaddr1, unsigned int flags1,
+ u32 __user *uaddr2, unsigned int flags2,
+ 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);
@@ -279,6 +361,16 @@ struct futex_vector {
struct futex_q q;
};
+extern int futex_parse_waitv(struct futex_vector *futexv,
+ struct futex_waitv __user *uwaitv,
+ unsigned int nr_futexes, futex_wake_fn *wake,
+ void *wake_data);
+
+extern int futex_wait_multiple_setup(struct futex_vector *vs, int count,
+ int *woken);
+
+extern int futex_unqueue_multiple(struct futex_vector *v, int count);
+
extern int futex_wait_multiple(struct futex_vector *vs, unsigned int count,
struct hrtimer_sleeper *to);