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-rw-r--r--include/linux/posix-timers.h131
1 files changed, 117 insertions, 14 deletions
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index b20798fc5191..3d10c84a97a9 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -4,18 +4,11 @@
#include <linux/spinlock.h>
#include <linux/list.h>
-#include <linux/sched.h>
-#include <linux/timex.h>
#include <linux/alarmtimer.h>
+#include <linux/timerqueue.h>
-struct siginfo;
-
-struct cpu_timer_list {
- struct list_head entry;
- u64 expires;
- struct task_struct *task;
- int firing;
-};
+struct kernel_siginfo;
+struct task_struct;
/*
* Bit fields within a clockid:
@@ -63,6 +56,115 @@ static inline int clockid_to_fd(const clockid_t clk)
return ~(clk >> 3);
}
+#ifdef CONFIG_POSIX_TIMERS
+
+/**
+ * cpu_timer - Posix CPU timer representation for k_itimer
+ * @node: timerqueue node to queue in the task/sig
+ * @head: timerqueue head on which this timer is queued
+ * @task: Pointer to target task
+ * @elist: List head for the expiry list
+ * @firing: Timer is currently firing
+ */
+struct cpu_timer {
+ struct timerqueue_node node;
+ struct timerqueue_head *head;
+ struct task_struct *task;
+ struct list_head elist;
+ int firing;
+};
+
+static inline bool cpu_timer_enqueue(struct timerqueue_head *head,
+ struct cpu_timer *ctmr)
+{
+ ctmr->head = head;
+ return timerqueue_add(head, &ctmr->node);
+}
+
+static inline void cpu_timer_dequeue(struct cpu_timer *ctmr)
+{
+ if (ctmr->head) {
+ timerqueue_del(ctmr->head, &ctmr->node);
+ ctmr->head = NULL;
+ }
+}
+
+static inline u64 cpu_timer_getexpires(struct cpu_timer *ctmr)
+{
+ return ctmr->node.expires;
+}
+
+static inline void cpu_timer_setexpires(struct cpu_timer *ctmr, u64 exp)
+{
+ ctmr->node.expires = exp;
+}
+
+/**
+ * posix_cputimer_base - Container per posix CPU clock
+ * @nextevt: Earliest-expiration cache
+ * @tqhead: timerqueue head for cpu_timers
+ */
+struct posix_cputimer_base {
+ u64 nextevt;
+ struct timerqueue_head tqhead;
+};
+
+/**
+ * posix_cputimers - Container for posix CPU timer related data
+ * @bases: Base container for posix CPU clocks
+ * @timers_active: Timers are queued.
+ * @expiry_active: Timer expiry is active. Used for
+ * process wide timers to avoid multiple
+ * task trying to handle expiry concurrently
+ *
+ * Used in task_struct and signal_struct
+ */
+struct posix_cputimers {
+ struct posix_cputimer_base bases[CPUCLOCK_MAX];
+ unsigned int timers_active;
+ unsigned int expiry_active;
+};
+
+static inline void posix_cputimers_init(struct posix_cputimers *pct)
+{
+ memset(pct, 0, sizeof(*pct));
+ pct->bases[0].nextevt = U64_MAX;
+ pct->bases[1].nextevt = U64_MAX;
+ pct->bases[2].nextevt = U64_MAX;
+}
+
+void posix_cputimers_group_init(struct posix_cputimers *pct, u64 cpu_limit);
+
+static inline void posix_cputimers_rt_watchdog(struct posix_cputimers *pct,
+ u64 runtime)
+{
+ pct->bases[CPUCLOCK_SCHED].nextevt = runtime;
+}
+
+/* Init task static initializer */
+#define INIT_CPU_TIMERBASE(b) { \
+ .nextevt = U64_MAX, \
+}
+
+#define INIT_CPU_TIMERBASES(b) { \
+ INIT_CPU_TIMERBASE(b[0]), \
+ INIT_CPU_TIMERBASE(b[1]), \
+ INIT_CPU_TIMERBASE(b[2]), \
+}
+
+#define INIT_CPU_TIMERS(s) \
+ .posix_cputimers = { \
+ .bases = INIT_CPU_TIMERBASES(s.posix_cputimers.bases), \
+ },
+#else
+struct posix_cputimers { };
+struct cpu_timer { };
+#define INIT_CPU_TIMERS(s)
+static inline void posix_cputimers_init(struct posix_cputimers *pct) { }
+static inline void posix_cputimers_group_init(struct posix_cputimers *pct,
+ u64 cpu_limit) { }
+#endif
+
#define REQUEUE_PENDING 1
/**
@@ -85,7 +187,8 @@ static inline int clockid_to_fd(const clockid_t clk)
* @it_process: The task to wakeup on clock_nanosleep (CPU timers)
* @sigq: Pointer to preallocated sigqueue
* @it: Union representing the various posix timer type
- * internals. Also used for rcu freeing the timer.
+ * internals.
+ * @rcu: RCU head for freeing the timer.
*/
struct k_itimer {
struct list_head list;
@@ -110,15 +213,15 @@ struct k_itimer {
struct {
struct hrtimer timer;
} real;
- struct cpu_timer_list cpu;
+ struct cpu_timer cpu;
struct {
struct alarm alarmtimer;
} alarm;
- struct rcu_head rcu;
} it;
+ struct rcu_head rcu;
};
-void run_posix_cpu_timers(struct task_struct *task);
+void run_posix_cpu_timers(void);
void posix_cpu_timers_exit(struct task_struct *task);
void posix_cpu_timers_exit_group(struct task_struct *task);
void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,