^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * This file contains functions which manage clock event devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/clockchips.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/hrtimer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "tick-internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /* The registered clock event devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static LIST_HEAD(clockevent_devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static LIST_HEAD(clockevents_released);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* Protection for the above */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static DEFINE_RAW_SPINLOCK(clockevents_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) /* Protection for unbind operations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static DEFINE_MUTEX(clockevents_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct ce_unbind {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct clock_event_device *ce;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static u64 cev_delta2ns(unsigned long latch, struct clock_event_device *evt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) bool ismax)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) u64 clc = (u64) latch << evt->shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) u64 rnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (WARN_ON(!evt->mult))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) evt->mult = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) rnd = (u64) evt->mult - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * Upper bound sanity check. If the backwards conversion is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * not equal latch, we know that the above shift overflowed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) if ((clc >> evt->shift) != (u64)latch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) clc = ~0ULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * Scaled math oddities:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * For mult <= (1 << shift) we can safely add mult - 1 to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * prevent integer rounding loss. So the backwards conversion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * from nsec to device ticks will be correct.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * For mult > (1 << shift), i.e. device frequency is > 1GHz we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * need to be careful. Adding mult - 1 will result in a value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * which when converted back to device ticks can be larger
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * than latch by up to (mult - 1) >> shift. For the min_delta
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * calculation we still want to apply this in order to stay
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * above the minimum device ticks limit. For the upper limit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * we would end up with a latch value larger than the upper
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * limit of the device, so we omit the add to stay below the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * device upper boundary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * Also omit the add if it would overflow the u64 boundary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if ((~0ULL - clc > rnd) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) (!ismax || evt->mult <= (1ULL << evt->shift)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) clc += rnd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) do_div(clc, evt->mult);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /* Deltas less than 1usec are pointless noise */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return clc > 1000 ? clc : 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * clockevents_delta2ns - Convert a latch value (device ticks) to nanoseconds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * @latch: value to convert
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * @evt: pointer to clock event device descriptor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * Math helper, returns latch value converted to nanoseconds (bound checked)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) u64 clockevent_delta2ns(unsigned long latch, struct clock_event_device *evt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) return cev_delta2ns(latch, evt, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) EXPORT_SYMBOL_GPL(clockevent_delta2ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static int __clockevents_switch_state(struct clock_event_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) enum clock_event_state state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (dev->features & CLOCK_EVT_FEAT_DUMMY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* Transition with new state-specific callbacks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) switch (state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) case CLOCK_EVT_STATE_DETACHED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /* The clockevent device is getting replaced. Shut it down. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) case CLOCK_EVT_STATE_SHUTDOWN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (dev->set_state_shutdown)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return dev->set_state_shutdown(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) case CLOCK_EVT_STATE_PERIODIC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /* Core internal bug */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (!(dev->features & CLOCK_EVT_FEAT_PERIODIC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (dev->set_state_periodic)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return dev->set_state_periodic(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) case CLOCK_EVT_STATE_ONESHOT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /* Core internal bug */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (!(dev->features & CLOCK_EVT_FEAT_ONESHOT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (dev->set_state_oneshot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return dev->set_state_oneshot(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) case CLOCK_EVT_STATE_ONESHOT_STOPPED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /* Core internal bug */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (WARN_ONCE(!clockevent_state_oneshot(dev),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) "Current state: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) clockevent_get_state(dev)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (dev->set_state_oneshot_stopped)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) return dev->set_state_oneshot_stopped(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * clockevents_switch_state - set the operating state of a clock event device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * @dev: device to modify
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * @state: new state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * Must be called with interrupts disabled !
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) void clockevents_switch_state(struct clock_event_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) enum clock_event_state state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (clockevent_get_state(dev) != state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (__clockevents_switch_state(dev, state))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) clockevent_set_state(dev, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * A nsec2cyc multiplicator of 0 is invalid and we'd crash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * on it, so fix it up and emit a warning:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (clockevent_state_oneshot(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (WARN_ON(!dev->mult))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) dev->mult = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * clockevents_shutdown - shutdown the device and clear next_event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * @dev: device to shutdown
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) void clockevents_shutdown(struct clock_event_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) clockevents_switch_state(dev, CLOCK_EVT_STATE_SHUTDOWN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) dev->next_event = KTIME_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * clockevents_tick_resume - Resume the tick device before using it again
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * @dev: device to resume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) int clockevents_tick_resume(struct clock_event_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (dev->tick_resume)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) ret = dev->tick_resume(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) #ifdef CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) /* Limit min_delta to a jiffie */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) #define MIN_DELTA_LIMIT (NSEC_PER_SEC / HZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) * clockevents_increase_min_delta - raise minimum delta of a clock event device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) * @dev: device to increase the minimum delta
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) * Returns 0 on success, -ETIME when the minimum delta reached the limit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) static int clockevents_increase_min_delta(struct clock_event_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) /* Nothing to do if we already reached the limit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if (dev->min_delta_ns >= MIN_DELTA_LIMIT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) printk_deferred(KERN_WARNING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) "CE: Reprogramming failure. Giving up\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) dev->next_event = KTIME_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) return -ETIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) if (dev->min_delta_ns < 5000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) dev->min_delta_ns = 5000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) dev->min_delta_ns += dev->min_delta_ns >> 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) if (dev->min_delta_ns > MIN_DELTA_LIMIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) dev->min_delta_ns = MIN_DELTA_LIMIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) printk_deferred(KERN_WARNING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) "CE: %s increased min_delta_ns to %llu nsec\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) dev->name ? dev->name : "?",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) (unsigned long long) dev->min_delta_ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) * clockevents_program_min_delta - Set clock event device to the minimum delay.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) * @dev: device to program
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * Returns 0 on success, -ETIME when the retry loop failed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) static int clockevents_program_min_delta(struct clock_event_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) unsigned long long clc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) int64_t delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) for (i = 0;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) delta = dev->min_delta_ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) dev->next_event = ktime_add_ns(ktime_get(), delta);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) if (clockevent_state_shutdown(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) dev->retries++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) clc = ((unsigned long long) delta * dev->mult) >> dev->shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) if (dev->set_next_event((unsigned long) clc, dev) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (++i > 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * We tried 3 times to program the device with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * given min_delta_ns. Try to increase the minimum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * delta, if that fails as well get out of here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) if (clockevents_increase_min_delta(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) return -ETIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) #else /* CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) * clockevents_program_min_delta - Set clock event device to the minimum delay.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) * @dev: device to program
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) * Returns 0 on success, -ETIME when the retry loop failed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) static int clockevents_program_min_delta(struct clock_event_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) unsigned long long clc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) int64_t delta = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) for (i = 0; i < 10; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) delta += dev->min_delta_ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) dev->next_event = ktime_add_ns(ktime_get(), delta);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (clockevent_state_shutdown(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) dev->retries++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) clc = ((unsigned long long) delta * dev->mult) >> dev->shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (dev->set_next_event((unsigned long) clc, dev) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) return -ETIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) #endif /* CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * clockevents_program_event - Reprogram the clock event device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * @dev: device to program
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) * @expires: absolute expiry time (monotonic clock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) * @force: program minimum delay if expires can not be set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) * Returns 0 on success, -ETIME when the event is in the past.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) int clockevents_program_event(struct clock_event_device *dev, ktime_t expires,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) bool force)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) unsigned long long clc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) int64_t delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (WARN_ON_ONCE(expires < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) return -ETIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) dev->next_event = expires;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) if (clockevent_state_shutdown(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) /* We must be in ONESHOT state here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) WARN_ONCE(!clockevent_state_oneshot(dev), "Current state: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) clockevent_get_state(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) /* Shortcut for clockevent devices that can deal with ktime. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) if (dev->features & CLOCK_EVT_FEAT_KTIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) return dev->set_next_ktime(expires, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) delta = ktime_to_ns(ktime_sub(expires, ktime_get()));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) if (delta <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) return force ? clockevents_program_min_delta(dev) : -ETIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) delta = min(delta, (int64_t) dev->max_delta_ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) delta = max(delta, (int64_t) dev->min_delta_ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) clc = ((unsigned long long) delta * dev->mult) >> dev->shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) rc = dev->set_next_event((unsigned long) clc, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) return (rc && force) ? clockevents_program_min_delta(dev) : rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) * Called after a notify add to make devices available which were
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) * released from the notifier call.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) static void clockevents_notify_released(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) struct clock_event_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) while (!list_empty(&clockevents_released)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) dev = list_entry(clockevents_released.next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) struct clock_event_device, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) list_del(&dev->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) list_add(&dev->list, &clockevent_devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) tick_check_new_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * Try to install a replacement clock event device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) static int clockevents_replace(struct clock_event_device *ced)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) struct clock_event_device *dev, *newdev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) list_for_each_entry(dev, &clockevent_devices, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (dev == ced || !clockevent_state_detached(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) if (!tick_check_replacement(newdev, dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (!try_module_get(dev->owner))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) if (newdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) module_put(newdev->owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) newdev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if (newdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) tick_install_replacement(newdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) list_del_init(&ced->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) return newdev ? 0 : -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * Called with clockevents_mutex and clockevents_lock held
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) static int __clockevents_try_unbind(struct clock_event_device *ced, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) /* Fast track. Device is unused */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) if (clockevent_state_detached(ced)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) list_del_init(&ced->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return ced == per_cpu(tick_cpu_device, cpu).evtdev ? -EAGAIN : -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) * SMP function call to unbind a device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) static void __clockevents_unbind(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) struct ce_unbind *cu = arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) raw_spin_lock(&clockevents_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) res = __clockevents_try_unbind(cu->ce, smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) if (res == -EAGAIN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) res = clockevents_replace(cu->ce);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) cu->res = res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) raw_spin_unlock(&clockevents_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) * Issues smp function call to unbind a per cpu device. Called with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) * clockevents_mutex held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) static int clockevents_unbind(struct clock_event_device *ced, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) struct ce_unbind cu = { .ce = ced, .res = -ENODEV };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) smp_call_function_single(cpu, __clockevents_unbind, &cu, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) return cu.res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) * Unbind a clockevents device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) int clockevents_unbind_device(struct clock_event_device *ced, int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) mutex_lock(&clockevents_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) ret = clockevents_unbind(ced, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) mutex_unlock(&clockevents_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) EXPORT_SYMBOL_GPL(clockevents_unbind_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) * clockevents_register_device - register a clock event device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) * @dev: device to register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) void clockevents_register_device(struct clock_event_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) /* Initialize state to DETACHED */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) clockevent_set_state(dev, CLOCK_EVT_STATE_DETACHED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if (!dev->cpumask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) WARN_ON(num_possible_cpus() > 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) dev->cpumask = cpumask_of(smp_processor_id());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if (dev->cpumask == cpu_all_mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) WARN(1, "%s cpumask == cpu_all_mask, using cpu_possible_mask instead\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) dev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) dev->cpumask = cpu_possible_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) raw_spin_lock_irqsave(&clockevents_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) list_add(&dev->list, &clockevent_devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) tick_check_new_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) clockevents_notify_released();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) raw_spin_unlock_irqrestore(&clockevents_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) EXPORT_SYMBOL_GPL(clockevents_register_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) static void clockevents_config(struct clock_event_device *dev, u32 freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) u64 sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) if (!(dev->features & CLOCK_EVT_FEAT_ONESHOT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) * Calculate the maximum number of seconds we can sleep. Limit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) * to 10 minutes for hardware which can program more than
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) * 32bit ticks so we still get reasonable conversion values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) sec = dev->max_delta_ticks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) do_div(sec, freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (!sec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) sec = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) else if (sec > 600 && dev->max_delta_ticks > UINT_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) sec = 600;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) clockevents_calc_mult_shift(dev, freq, sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) dev->min_delta_ns = cev_delta2ns(dev->min_delta_ticks, dev, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) dev->max_delta_ns = cev_delta2ns(dev->max_delta_ticks, dev, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * clockevents_config_and_register - Configure and register a clock event device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * @dev: device to register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) * @freq: The clock frequency
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * @min_delta: The minimum clock ticks to program in oneshot mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) * @max_delta: The maximum clock ticks to program in oneshot mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) * min/max_delta can be 0 for devices which do not support oneshot mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) void clockevents_config_and_register(struct clock_event_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) u32 freq, unsigned long min_delta,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) unsigned long max_delta)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) dev->min_delta_ticks = min_delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) dev->max_delta_ticks = max_delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) clockevents_config(dev, freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) clockevents_register_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) EXPORT_SYMBOL_GPL(clockevents_config_and_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) int __clockevents_update_freq(struct clock_event_device *dev, u32 freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) clockevents_config(dev, freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) if (clockevent_state_oneshot(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) return clockevents_program_event(dev, dev->next_event, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) if (clockevent_state_periodic(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) return __clockevents_switch_state(dev, CLOCK_EVT_STATE_PERIODIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) * clockevents_update_freq - Update frequency and reprogram a clock event device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) * @dev: device to modify
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) * @freq: new device frequency
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) * Reconfigure and reprogram a clock event device in oneshot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) * mode. Must be called on the cpu for which the device delivers per
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) * cpu timer events. If called for the broadcast device the core takes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) * care of serialization.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) * Returns 0 on success, -ETIME when the event is in the past.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) int clockevents_update_freq(struct clock_event_device *dev, u32 freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) local_irq_save(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) ret = tick_broadcast_update_freq(dev, freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) if (ret == -ENODEV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) ret = __clockevents_update_freq(dev, freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) local_irq_restore(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) * Noop handler when we shut down an event device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) void clockevents_handle_noop(struct clock_event_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) * clockevents_exchange_device - release and request clock devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) * @old: device to release (can be NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) * @new: device to request (can be NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) * Called from various tick functions with clockevents_lock held and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) * interrupts disabled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) void clockevents_exchange_device(struct clock_event_device *old,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) struct clock_event_device *new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) * Caller releases a clock event device. We queue it into the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) * released list and do a notify add later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) if (old) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) module_put(old->owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) clockevents_switch_state(old, CLOCK_EVT_STATE_DETACHED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) list_del(&old->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) list_add(&old->list, &clockevents_released);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) if (new) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) BUG_ON(!clockevent_state_detached(new));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) clockevents_shutdown(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) * clockevents_suspend - suspend clock devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) void clockevents_suspend(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) struct clock_event_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) list_for_each_entry_reverse(dev, &clockevent_devices, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) if (dev->suspend && !clockevent_state_detached(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) dev->suspend(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) * clockevents_resume - resume clock devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) void clockevents_resume(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) struct clock_event_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) list_for_each_entry(dev, &clockevent_devices, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (dev->resume && !clockevent_state_detached(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) dev->resume(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) #ifdef CONFIG_HOTPLUG_CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) * tick_offline_cpu - Take CPU out of the broadcast mechanism
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) * @cpu: The outgoing CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) * Called on the outgoing CPU after it took itself offline.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) void tick_offline_cpu(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) raw_spin_lock(&clockevents_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) tick_broadcast_offline(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) raw_spin_unlock(&clockevents_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) # endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) * tick_cleanup_dead_cpu - Cleanup the tick and clockevents of a dead cpu
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) void tick_cleanup_dead_cpu(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) struct clock_event_device *dev, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) raw_spin_lock_irqsave(&clockevents_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) tick_shutdown(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) * Unregister the clock event devices which were
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) * released from the users in the notify chain.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) list_for_each_entry_safe(dev, tmp, &clockevents_released, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) list_del(&dev->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) * Now check whether the CPU has left unused per cpu devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) list_for_each_entry_safe(dev, tmp, &clockevent_devices, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) if (cpumask_test_cpu(cpu, dev->cpumask) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) cpumask_weight(dev->cpumask) == 1 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) !tick_is_broadcast_device(dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) BUG_ON(!clockevent_state_detached(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) list_del(&dev->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) raw_spin_unlock_irqrestore(&clockevents_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) #ifdef CONFIG_SYSFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) static struct bus_type clockevents_subsys = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) .name = "clockevents",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) .dev_name = "clockevent",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) static DEFINE_PER_CPU(struct device, tick_percpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) static struct tick_device *tick_get_tick_dev(struct device *dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) static ssize_t sysfs_show_current_tick_dev(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) struct tick_device *td;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) ssize_t count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) raw_spin_lock_irq(&clockevents_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) td = tick_get_tick_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) if (td && td->evtdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) count = snprintf(buf, PAGE_SIZE, "%s\n", td->evtdev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) raw_spin_unlock_irq(&clockevents_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) static DEVICE_ATTR(current_device, 0444, sysfs_show_current_tick_dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) /* We don't support the abomination of removable broadcast devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) static ssize_t sysfs_unbind_tick_dev(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) char name[CS_NAME_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) ssize_t ret = sysfs_get_uname(buf, name, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) struct clock_event_device *ce;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) mutex_lock(&clockevents_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) raw_spin_lock_irq(&clockevents_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) list_for_each_entry(ce, &clockevent_devices, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) if (!strcmp(ce->name, name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) ret = __clockevents_try_unbind(ce, dev->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) raw_spin_unlock_irq(&clockevents_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) * We hold clockevents_mutex, so ce can't go away
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) if (ret == -EAGAIN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) ret = clockevents_unbind(ce, dev->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) mutex_unlock(&clockevents_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) return ret ? ret : count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) static DEVICE_ATTR(unbind_device, 0200, NULL, sysfs_unbind_tick_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) static struct device tick_bc_dev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) .init_name = "broadcast",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) .id = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) .bus = &clockevents_subsys,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) static struct tick_device *tick_get_tick_dev(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) return dev == &tick_bc_dev ? tick_get_broadcast_device() :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) &per_cpu(tick_cpu_device, dev->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) static __init int tick_broadcast_init_sysfs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) int err = device_register(&tick_bc_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) err = device_create_file(&tick_bc_dev, &dev_attr_current_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) static struct tick_device *tick_get_tick_dev(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) return &per_cpu(tick_cpu_device, dev->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) static inline int tick_broadcast_init_sysfs(void) { return 0; }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) static int __init tick_init_sysfs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) struct device *dev = &per_cpu(tick_percpu_dev, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) dev->id = cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) dev->bus = &clockevents_subsys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) err = device_register(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) err = device_create_file(dev, &dev_attr_current_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) err = device_create_file(dev, &dev_attr_unbind_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) return tick_broadcast_init_sysfs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) static int __init clockevents_init_sysfs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) int err = subsys_system_register(&clockevents_subsys, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) err = tick_init_sysfs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) device_initcall(clockevents_init_sysfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) #endif /* SYSFS */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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