diff options
| -rw-r--r-- | include/linux/clockchips.h | 21 | ||||
| -rw-r--r-- | kernel/time/clockevents.c | 88 | ||||
| -rw-r--r-- | kernel/time/timer_list.c | 32 |
3 files changed, 134 insertions, 7 deletions
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h index 2e4cb67f6e56..59af26b54d15 100644 --- a/include/linux/clockchips.h +++ b/include/linux/clockchips.h @@ -39,6 +39,8 @@ enum clock_event_mode { CLOCK_EVT_MODE_PERIODIC, CLOCK_EVT_MODE_ONESHOT, CLOCK_EVT_MODE_RESUME, + + /* Legacy ->set_mode() callback doesn't support below modes */ }; /* @@ -81,7 +83,11 @@ enum clock_event_mode { * @mode: operating mode assigned by the management code * @features: features * @retries: number of forced programming retries - * @set_mode: set mode function + * @set_mode: legacy set mode function, only for modes <= CLOCK_EVT_MODE_RESUME. + * @set_mode_periodic: switch mode to periodic, if !set_mode + * @set_mode_oneshot: switch mode to oneshot, if !set_mode + * @set_mode_shutdown: switch mode to shutdown, if !set_mode + * @set_mode_resume: resume clkevt device, if !set_mode * @broadcast: function to broadcast events * @min_delta_ticks: minimum delta value in ticks stored for reconfiguration * @max_delta_ticks: maximum delta value in ticks stored for reconfiguration @@ -108,9 +114,20 @@ struct clock_event_device { unsigned int features; unsigned long retries; - void (*broadcast)(const struct cpumask *mask); + /* + * Mode transition callback(s): Only one of the two groups should be + * defined: + * - set_mode(), only for modes <= CLOCK_EVT_MODE_RESUME. + * - set_mode_{shutdown|periodic|oneshot|resume}(). + */ void (*set_mode)(enum clock_event_mode mode, struct clock_event_device *); + int (*set_mode_periodic)(struct clock_event_device *); + int (*set_mode_oneshot)(struct clock_event_device *); + int (*set_mode_shutdown)(struct clock_event_device *); + int (*set_mode_resume)(struct clock_event_device *); + + void (*broadcast)(const struct cpumask *mask); void (*suspend)(struct clock_event_device *); void (*resume)(struct clock_event_device *); unsigned long min_delta_ticks; diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c index 55449909f114..489642b08d64 100644 --- a/kernel/time/clockevents.c +++ b/kernel/time/clockevents.c @@ -94,6 +94,57 @@ u64 clockevent_delta2ns(unsigned long latch, struct clock_event_device *evt) } EXPORT_SYMBOL_GPL(clockevent_delta2ns); +static int __clockevents_set_mode(struct clock_event_device *dev, + enum clock_event_mode mode) +{ + /* Transition with legacy set_mode() callback */ + if (dev->set_mode) { + /* Legacy callback doesn't support new modes */ + if (mode > CLOCK_EVT_MODE_RESUME) + return -ENOSYS; + dev->set_mode(mode, dev); + return 0; + } + + if (dev->features & CLOCK_EVT_FEAT_DUMMY) + return 0; + + /* Transition with new mode-specific callbacks */ + switch (mode) { + case CLOCK_EVT_MODE_UNUSED: + /* + * This is an internal state, which is guaranteed to go from + * SHUTDOWN to UNUSED. No driver interaction required. + */ + return 0; + + case CLOCK_EVT_MODE_SHUTDOWN: + return dev->set_mode_shutdown(dev); + + case CLOCK_EVT_MODE_PERIODIC: + /* Core internal bug */ + if (!(dev->features & CLOCK_EVT_FEAT_PERIODIC)) + return -ENOSYS; + return dev->set_mode_periodic(dev); + + case CLOCK_EVT_MODE_ONESHOT: + /* Core internal bug */ + if (!(dev->features & CLOCK_EVT_FEAT_ONESHOT)) + return -ENOSYS; + return dev->set_mode_oneshot(dev); + + case CLOCK_EVT_MODE_RESUME: + /* Optional callback */ + if (dev->set_mode_resume) + return dev->set_mode_resume(dev); + else + return 0; + + default: + return -ENOSYS; + } +} + /** * clockevents_set_mode - set the operating mode of a clock event device * @dev: device to modify @@ -105,7 +156,9 @@ void clockevents_set_mode(struct clock_event_device *dev, enum clock_event_mode mode) { if (dev->mode != mode) { - dev->set_mode(mode, dev); + if (__clockevents_set_mode(dev, mode)) + return; + dev->mode = mode; /* @@ -373,6 +426,35 @@ int clockevents_unbind_device(struct clock_event_device *ced, int cpu) } EXPORT_SYMBOL_GPL(clockevents_unbind); +/* Sanity check of mode transition callbacks */ +static int clockevents_sanity_check(struct clock_event_device *dev) +{ + /* Legacy set_mode() callback */ + if (dev->set_mode) { + /* We shouldn't be supporting new modes now */ + WARN_ON(dev->set_mode_periodic || dev->set_mode_oneshot || + dev->set_mode_shutdown || dev->set_mode_resume); + return 0; + } + + if (dev->features & CLOCK_EVT_FEAT_DUMMY) + return 0; + + /* New mode-specific callbacks */ + if (!dev->set_mode_shutdown) + return -EINVAL; + + if ((dev->features & CLOCK_EVT_FEAT_PERIODIC) && + !dev->set_mode_periodic) + return -EINVAL; + + if ((dev->features & CLOCK_EVT_FEAT_ONESHOT) && + !dev->set_mode_oneshot) + return -EINVAL; + + return 0; +} + /** * clockevents_register_device - register a clock event device * @dev: device to register @@ -382,6 +464,8 @@ void clockevents_register_device(struct clock_event_device *dev) unsigned long flags; BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED); + BUG_ON(clockevents_sanity_check(dev)); + if (!dev->cpumask) { WARN_ON(num_possible_cpus() > 1); dev->cpumask = cpumask_of(smp_processor_id()); @@ -449,7 +533,7 @@ int __clockevents_update_freq(struct clock_event_device *dev, u32 freq) return clockevents_program_event(dev, dev->next_event, false); if (dev->mode == CLOCK_EVT_MODE_PERIODIC) - dev->set_mode(CLOCK_EVT_MODE_PERIODIC, dev); + return __clockevents_set_mode(dev, CLOCK_EVT_MODE_PERIODIC); return 0; } diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c index 61ed862cdd37..2cfd19485824 100644 --- a/kernel/time/timer_list.c +++ b/kernel/time/timer_list.c @@ -228,9 +228,35 @@ print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu) print_name_offset(m, dev->set_next_event); SEQ_printf(m, "\n"); - SEQ_printf(m, " set_mode: "); - print_name_offset(m, dev->set_mode); - SEQ_printf(m, "\n"); + if (dev->set_mode) { + SEQ_printf(m, " set_mode: "); + print_name_offset(m, dev->set_mode); + SEQ_printf(m, "\n"); + } else { + if (dev->set_mode_shutdown) { + SEQ_printf(m, " shutdown: "); + print_name_offset(m, dev->set_mode_shutdown); + SEQ_printf(m, "\n"); + } + + if (dev->set_mode_periodic) { + SEQ_printf(m, " periodic: "); + print_name_offset(m, dev->set_mode_periodic); + SEQ_printf(m, "\n"); + } + + if (dev->set_mode_oneshot) { + SEQ_printf(m, " oneshot: "); + print_name_offset(m, dev->set_mode_oneshot); + SEQ_printf(m, "\n"); + } + + if (dev->set_mode_resume) { + SEQ_printf(m, " resume: "); + print_name_offset(m, dev->set_mode_resume); + SEQ_printf(m, "\n"); + } + } SEQ_printf(m, " event_handler: "); print_name_offset(m, dev->event_handler); |