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Message-Id: <c1b0112410870f49e7bf06958e1483eac6c15e20.1425037853.git.viresh.kumar@linaro.org>
Date: Fri, 27 Feb 2015 17:21:32 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>
Cc: linaro-kernel@...ts.linaro.org, Kevin Hilman <khilman@...aro.org>,
Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Frederic Weisbecker <fweisbec@...il.com>,
linaro-networking@...aro.org,
Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH 1/3] clockevents: Handle tick device's resume separately
Next commit will redefine possible states of a clockevent device. The RESUME
mode is a special case only for tick's clockevent devices. In future it can be
replaced by ->resume() callback already available for clockevent devices.
Lets handle it separately so that clockevents_set_mode() only handles states
valid across all devices. This also renames set_mode_resume() to tick_resume()
to make it more explicit.
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
include/linux/clockchips.h | 4 ++--
kernel/time/clockevents.c | 30 +++++++++++++++++++++---------
kernel/time/tick-broadcast.c | 2 +-
kernel/time/tick-common.c | 2 +-
kernel/time/tick-internal.h | 1 +
kernel/time/timer_list.c | 4 ++--
6 files changed, 28 insertions(+), 15 deletions(-)
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h
index 59af26b54d15..a41749543d48 100644
--- a/include/linux/clockchips.h
+++ b/include/linux/clockchips.h
@@ -87,7 +87,7 @@ enum clock_event_mode {
* @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
+ * @tick_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
@@ -125,7 +125,7 @@ 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 *);
+ int (*tick_resume)(struct clock_event_device *);
void (*broadcast)(const struct cpumask *mask);
void (*suspend)(struct clock_event_device *);
diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index 489642b08d64..1b0ea63de69c 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -100,7 +100,7 @@ static int __clockevents_set_mode(struct clock_event_device *dev,
/* Transition with legacy set_mode() callback */
if (dev->set_mode) {
/* Legacy callback doesn't support new modes */
- if (mode > CLOCK_EVT_MODE_RESUME)
+ if (mode > CLOCK_EVT_MODE_ONESHOT)
return -ENOSYS;
dev->set_mode(mode, dev);
return 0;
@@ -133,13 +133,6 @@ static int __clockevents_set_mode(struct clock_event_device *dev,
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;
}
@@ -184,6 +177,25 @@ void clockevents_shutdown(struct clock_event_device *dev)
dev->next_event.tv64 = KTIME_MAX;
}
+/**
+ * clockevents_tick_resume - Resume the tick device before using it again
+ * @dev: device to resume
+ */
+int clockevents_tick_resume(struct clock_event_device *dev)
+{
+ int ret = 0;
+
+ if (dev->set_mode)
+ dev->set_mode(CLOCK_EVT_MODE_RESUME, dev);
+ else if (dev->tick_resume)
+ ret = dev->tick_resume(dev);
+
+ if (likely(!ret))
+ dev->mode = CLOCK_EVT_MODE_RESUME;
+
+ return ret;
+}
+
#ifdef CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST
/* Limit min_delta to a jiffie */
@@ -433,7 +445,7 @@ static int clockevents_sanity_check(struct clock_event_device *dev)
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);
+ dev->set_mode_shutdown || dev->tick_resume);
return 0;
}
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 066f0ec05e48..542d5bb5c13d 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -464,7 +464,7 @@ int tick_resume_broadcast(void)
bc = tick_broadcast_device.evtdev;
if (bc) {
- clockevents_set_mode(bc, CLOCK_EVT_MODE_RESUME);
+ clockevents_tick_resume(bc);
switch (tick_broadcast_device.mode) {
case TICKDEV_MODE_PERIODIC:
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index f7c515595b42..5c50664c21d7 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -384,7 +384,7 @@ void tick_resume(void)
struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
int broadcast = tick_resume_broadcast();
- clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_RESUME);
+ clockevents_tick_resume(td->evtdev);
if (!broadcast) {
if (td->mode == TICKDEV_MODE_PERIODIC)
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index 366aeb4f2c66..98700e4a2000 100644
--- a/kernel/time/tick-internal.h
+++ b/kernel/time/tick-internal.h
@@ -32,6 +32,7 @@ extern bool tick_check_replacement(struct clock_event_device *curdev,
extern void tick_install_replacement(struct clock_event_device *dev);
extern void clockevents_shutdown(struct clock_event_device *dev);
+extern int clockevents_tick_resume(struct clock_event_device *dev);
extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index 2cfd19485824..2b3e9393034d 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -251,9 +251,9 @@ print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
SEQ_printf(m, "\n");
}
- if (dev->set_mode_resume) {
+ if (dev->tick_resume) {
SEQ_printf(m, " resume: ");
- print_name_offset(m, dev->set_mode_resume);
+ print_name_offset(m, dev->tick_resume);
SEQ_printf(m, "\n");
}
}
--
2.3.0.rc0.44.ga94655d
--
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