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Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull timer updates from Thomas Gleixner:
 "The timer departement presents:

   - A rather large rework of the hrtimer infrastructure which
     introduces softirq based hrtimers to replace the spread of
     hrtimer/tasklet combos which force the actual callback execution
     into softirq context. The approach is completely different from the
     initial implementation which you cursed at 10 years ago rightfully.

     The softirq based timers have their own queues and there is no
     nasty indirection and list reshuffling in the hard interrupt
     anymore. This comes with conversion of some of the hrtimer/tasklet
     users, the rest and the final removal of that horrible interface
     will come towards the end of the merge window or go through the
     relevant maintainer trees.

     Note: The top commit merged the last minute bugfix for the 10 years
     old CPU hotplug bug as I wanted to make sure that I fatfinger the
     merge conflict resolution myself.

   - The overhaul of the STM32 clocksource/clockevents driver

   - A new driver for the Spreadtrum SC9860 timer

   - A new driver dor the Actions Semi S700 timer

   - The usual set of fixes and updates all over the place"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (53 commits)
  usb/gadget/NCM: Replace tasklet with softirq hrtimer
  ALSA/dummy: Replace tasklet with softirq hrtimer
  hrtimer: Implement SOFT/HARD clock base selection
  hrtimer: Implement support for softirq based hrtimers
  hrtimer: Prepare handling of hard and softirq based hrtimers
  hrtimer: Add clock bases and hrtimer mode for softirq context
  hrtimer: Use irqsave/irqrestore around __run_hrtimer()
  hrtimer: Factor out __hrtimer_next_event_base()
  hrtimer: Factor out __hrtimer_start_range_ns()
  hrtimer: Remove the 'base' parameter from hrtimer_reprogram()
  hrtimer: Make remote enqueue decision less restrictive
  hrtimer: Unify remote enqueue handling
  hrtimer: Unify hrtimer removal handling
  hrtimer: Make hrtimer_force_reprogramm() unconditionally available
  hrtimer: Make hrtimer_reprogramm() unconditional
  hrtimer: Make hrtimer_cpu_base.next_timer handling unconditional
  hrtimer: Make the remote enqueue check unconditional
  hrtimer: Use accesor functions instead of direct access
  hrtimer: Make the hrtimer_cpu_base::hres_active field unconditional, to simplify the code
  hrtimer: Make room in 'struct hrtimer_cpu_base'
  ...
This commit is contained in:
Linus Torvalds 2018-01-29 16:50:58 -08:00
parent 7bcd342594 303c146df1
commit a46d3f9b1c
22 changed files with 1159 additions and 559 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/devicetree/bindings/timer/actions,owl-timer.txt
View File

@ -2,6 +2,7 @@ Actions Semi Owl Timer
Required properties:
- compatible : "actions,s500-timer" for S500
"actions,s700-timer" for S700
"actions,s900-timer" for S900
- reg : Offset and length of the register set for the device.
- interrupts : Should contain the interrupts.

20
Documentation/devicetree/bindings/timer/spreadtrum,sprd-timer.txt Normal file
View File

@ -0,0 +1,20 @@
Spreadtrum timers
The Spreadtrum SC9860 platform provides 3 general-purpose timers.
These timers can support 32bit or 64bit counter, as well as supporting
period mode or one-shot mode, and they are can be wakeup source
during deep sleep.
Required properties:
- compatible: should be "sprd,sc9860-timer" for SC9860 platform.
- reg: The register address of the timer device.
- interrupts: Should contain the interrupt for the timer device.
- clocks: The phandle to the source clock (usually a 32.768 KHz fixed clock).
Example:
timer@40050000 {
compatible = "sprd,sc9860-timer";
reg = <0 0x40050000 0 0x20>;
interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&ext_32k>;
};

8
drivers/clocksource/Kconfig
View File

@ -269,6 +269,7 @@ config CLKSRC_STM32
bool "Clocksource for STM32 SoCs" if !ARCH_STM32
depends on OF && ARM && (ARCH_STM32 || COMPILE_TEST)
select CLKSRC_MMIO
select TIMER_OF
config CLKSRC_MPS2
bool "Clocksource for MPS2 SoCs" if COMPILE_TEST
@ -441,6 +442,13 @@ config MTK_TIMER
help
Support for Mediatek timer driver.
config SPRD_TIMER
bool "Spreadtrum timer driver" if COMPILE_TEST
depends on HAS_IOMEM
select TIMER_OF
help
Enables support for the Spreadtrum timer driver.
config SYS_SUPPORTS_SH_MTU2
bool

1
drivers/clocksource/Makefile
View File

@ -54,6 +54,7 @@ obj-$(CONFIG_CLKSRC_TI_32K) += timer-ti-32k.o
obj-$(CONFIG_CLKSRC_NPS) += timer-nps.o
obj-$(CONFIG_OXNAS_RPS_TIMER) += timer-oxnas-rps.o
obj-$(CONFIG_OWL_TIMER) += owl-timer.o
obj-$(CONFIG_SPRD_TIMER) += timer-sprd.o
obj-$(CONFIG_ARC_TIMERS) += arc_timer.o
obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o

5
drivers/clocksource/owl-timer.c
View File

@ -168,5 +168,6 @@ static int __init owl_timer_init(struct device_node *node)
return 0;
}
CLOCKSOURCE_OF_DECLARE(owl_s500, "actions,s500-timer", owl_timer_init);
CLOCKSOURCE_OF_DECLARE(owl_s900, "actions,s900-timer", owl_timer_init);
TIMER_OF_DECLARE(owl_s500, "actions,s500-timer", owl_timer_init);
TIMER_OF_DECLARE(owl_s700, "actions,s700-timer", owl_timer_init);
TIMER_OF_DECLARE(owl_s900, "actions,s900-timer", owl_timer_init);

2
drivers/clocksource/tcb_clksrc.c
View File

@ -384,7 +384,7 @@ static int __init tcb_clksrc_init(void)
printk(bootinfo, clksrc.name, CONFIG_ATMEL_TCB_CLKSRC_BLOCK,
divided_rate / 1000000,
((divided_rate + 500000) % 1000000) / 1000);
((divided_rate % 1000000) + 500) / 1000);
if (tc->tcb_config && tc->tcb_config->counter_width == 32) {
/* use apropriate function to read 32 bit counter */

84
drivers/clocksource/timer-of.c
View File

@ -24,7 +24,13 @@
#include "timer-of.h"
static __init void timer_irq_exit(struct of_timer_irq *of_irq)
/**
* timer_of_irq_exit - Release the interrupt
* @of_irq: an of_timer_irq structure pointer
*
* Free the irq resource
*/
static __init void timer_of_irq_exit(struct of_timer_irq *of_irq)
{
struct timer_of *to = container_of(of_irq, struct timer_of, of_irq);
@ -34,8 +40,24 @@ static __init void timer_irq_exit(struct of_timer_irq *of_irq)
free_irq(of_irq->irq, clkevt);
}
static __init int timer_irq_init(struct device_node *np,
struct of_timer_irq *of_irq)
/**
* timer_of_irq_init - Request the interrupt
* @np: a device tree node pointer
* @of_irq: an of_timer_irq structure pointer
*
* Get the interrupt number from the DT from its definition and
* request it. The interrupt is gotten by falling back the following way:
*
* - Get interrupt number by name
* - Get interrupt number by index
*
* When the interrupt is per CPU, 'request_percpu_irq()' is called,
* otherwise 'request_irq()' is used.
*
* Returns 0 on success, < 0 otherwise
*/
static __init int timer_of_irq_init(struct device_node *np,
struct of_timer_irq *of_irq)
{
int ret;
struct timer_of *to = container_of(of_irq, struct timer_of, of_irq);
@ -72,15 +94,30 @@ static __init int timer_irq_init(struct device_node *np,
return 0;
}
static __init void timer_clk_exit(struct of_timer_clk *of_clk)
/**
* timer_of_clk_exit - Release the clock resources
* @of_clk: a of_timer_clk structure pointer
*
* Disables and releases the refcount on the clk
*/
static __init void timer_of_clk_exit(struct of_timer_clk *of_clk)
{
of_clk->rate = 0;
clk_disable_unprepare(of_clk->clk);
clk_put(of_clk->clk);
}
static __init int timer_clk_init(struct device_node *np,
struct of_timer_clk *of_clk)
/**
* timer_of_clk_init - Initialize the clock resources
* @np: a device tree node pointer
* @of_clk: a of_timer_clk structure pointer
*
* Get the clock by name or by index, enable it and get the rate
*
* Returns 0 on success, < 0 otherwise
*/
static __init int timer_of_clk_init(struct device_node *np,
struct of_timer_clk *of_clk)
{
int ret;
@ -116,19 +153,19 @@ static __init int timer_clk_init(struct device_node *np,
goto out;
}
static __init void timer_base_exit(struct of_timer_base *of_base)
static __init void timer_of_base_exit(struct of_timer_base *of_base)
{
iounmap(of_base->base);
}
static __init int timer_base_init(struct device_node *np,
struct of_timer_base *of_base)
static __init int timer_of_base_init(struct device_node *np,
struct of_timer_base *of_base)
{
const char *name = of_base->name ? of_base->name : np->full_name;
of_base->base = of_io_request_and_map(np, of_base->index, name);
of_base->base = of_base->name ?
of_io_request_and_map(np, of_base->index, of_base->name) :
of_iomap(np, of_base->index);
if (IS_ERR(of_base->base)) {
pr_err("Failed to iomap (%s)\n", name);
pr_err("Failed to iomap (%s)\n", of_base->name);
return PTR_ERR(of_base->base);
}
@ -141,21 +178,21 @@ int __init timer_of_init(struct device_node *np, struct timer_of *to)
int flags = 0;
if (to->flags & TIMER_OF_BASE) {
ret = timer_base_init(np, &to->of_base);
ret = timer_of_base_init(np, &to->of_base);
if (ret)
goto out_fail;
flags |= TIMER_OF_BASE;
}
if (to->flags & TIMER_OF_CLOCK) {
ret = timer_clk_init(np, &to->of_clk);
ret = timer_of_clk_init(np, &to->of_clk);
if (ret)
goto out_fail;
flags |= TIMER_OF_CLOCK;
}
if (to->flags & TIMER_OF_IRQ) {
ret = timer_irq_init(np, &to->of_irq);
ret = timer_of_irq_init(np, &to->of_irq);
if (ret)
goto out_fail;
flags |= TIMER_OF_IRQ;
@ -163,17 +200,20 @@ int __init timer_of_init(struct device_node *np, struct timer_of *to)
if (!to->clkevt.name)
to->clkevt.name = np->name;
to->np = np;
return ret;
out_fail:
if (flags & TIMER_OF_IRQ)
timer_irq_exit(&to->of_irq);
timer_of_irq_exit(&to->of_irq);
if (flags & TIMER_OF_CLOCK)
timer_clk_exit(&to->of_clk);
timer_of_clk_exit(&to->of_clk);
if (flags & TIMER_OF_BASE)
timer_base_exit(&to->of_base);
timer_of_base_exit(&to->of_base);
return ret;
}
@ -187,11 +227,11 @@ int __init timer_of_init(struct device_node *np, struct timer_of *to)
void __init timer_of_cleanup(struct timer_of *to)
{
if (to->flags & TIMER_OF_IRQ)
timer_irq_exit(&to->of_irq);
timer_of_irq_exit(&to->of_irq);
if (to->flags & TIMER_OF_CLOCK)
timer_clk_exit(&to->of_clk);
timer_of_clk_exit(&to->of_clk);
if (to->flags & TIMER_OF_BASE)
timer_base_exit(&to->of_base);
timer_of_base_exit(&to->of_base);
}

1
drivers/clocksource/timer-of.h
View File

@ -33,6 +33,7 @@ struct of_timer_clk {
struct timer_of {
unsigned int flags;
struct device_node *np;
struct clock_event_device clkevt;
struct of_timer_base of_base;
struct of_timer_irq of_irq;

159
drivers/clocksource/timer-sprd.c Normal file
View File

@ -0,0 +1,159 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2017 Spreadtrum Communications Inc.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include "timer-of.h"
#define TIMER_NAME "sprd_timer"
#define TIMER_LOAD_LO 0x0
#define TIMER_LOAD_HI 0x4
#define TIMER_VALUE_LO 0x8
#define TIMER_VALUE_HI 0xc
#define TIMER_CTL 0x10
#define TIMER_CTL_PERIOD_MODE BIT(0)
#define TIMER_CTL_ENABLE BIT(1)
#define TIMER_CTL_64BIT_WIDTH BIT(16)
#define TIMER_INT 0x14
#define TIMER_INT_EN BIT(0)
#define TIMER_INT_RAW_STS BIT(1)
#define TIMER_INT_MASK_STS BIT(2)
#define TIMER_INT_CLR BIT(3)
#define TIMER_VALUE_SHDW_LO 0x18
#define TIMER_VALUE_SHDW_HI 0x1c
#define TIMER_VALUE_LO_MASK GENMASK(31, 0)
static void sprd_timer_enable(void __iomem *base, u32 flag)
{
u32 val = readl_relaxed(base + TIMER_CTL);
val |= TIMER_CTL_ENABLE;
if (flag & TIMER_CTL_64BIT_WIDTH)
val |= TIMER_CTL_64BIT_WIDTH;
else
val &= ~TIMER_CTL_64BIT_WIDTH;
if (flag & TIMER_CTL_PERIOD_MODE)
val |= TIMER_CTL_PERIOD_MODE;
else
val &= ~TIMER_CTL_PERIOD_MODE;
writel_relaxed(val, base + TIMER_CTL);
}
static void sprd_timer_disable(void __iomem *base)
{
u32 val = readl_relaxed(base + TIMER_CTL);
val &= ~TIMER_CTL_ENABLE;
writel_relaxed(val, base + TIMER_CTL);
}
static void sprd_timer_update_counter(void __iomem *base, unsigned long cycles)
{
writel_relaxed(cycles & TIMER_VALUE_LO_MASK, base + TIMER_LOAD_LO);
writel_relaxed(0, base + TIMER_LOAD_HI);
}
static void sprd_timer_enable_interrupt(void __iomem *base)
{
writel_relaxed(TIMER_INT_EN, base + TIMER_INT);
}
static void sprd_timer_clear_interrupt(void __iomem *base)
{
u32 val = readl_relaxed(base + TIMER_INT);
val |= TIMER_INT_CLR;
writel_relaxed(val, base + TIMER_INT);
}
static int sprd_timer_set_next_event(unsigned long cycles,
struct clock_event_device *ce)
{
struct timer_of *to = to_timer_of(ce);
sprd_timer_disable(timer_of_base(to));
sprd_timer_update_counter(timer_of_base(to), cycles);
sprd_timer_enable(timer_of_base(to), 0);
return 0;
}
static int sprd_timer_set_periodic(struct clock_event_device *ce)
{
struct timer_of *to = to_timer_of(ce);
sprd_timer_disable(timer_of_base(to));
sprd_timer_update_counter(timer_of_base(to), timer_of_period(to));
sprd_timer_enable(timer_of_base(to), TIMER_CTL_PERIOD_MODE);
return 0;
}
static int sprd_timer_shutdown(struct clock_event_device *ce)
{
struct timer_of *to = to_timer_of(ce);
sprd_timer_disable(timer_of_base(to));
return 0;
}
static irqreturn_t sprd_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *ce = (struct clock_event_device *)dev_id;
struct timer_of *to = to_timer_of(ce);
sprd_timer_clear_interrupt(timer_of_base(to));
if (clockevent_state_oneshot(ce))
sprd_timer_disable(timer_of_base(to));
ce->event_handler(ce);
return IRQ_HANDLED;
}
static struct timer_of to = {
.flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,
.clkevt = {
.name = TIMER_NAME,
.rating = 300,
.features = CLOCK_EVT_FEAT_DYNIRQ | CLOCK_EVT_FEAT_PERIODIC |
CLOCK_EVT_FEAT_ONESHOT,
.set_state_shutdown = sprd_timer_shutdown,
.set_state_periodic = sprd_timer_set_periodic,
.set_next_event = sprd_timer_set_next_event,
.cpumask = cpu_possible_mask,
},
.of_irq = {
.handler = sprd_timer_interrupt,
.flags = IRQF_TIMER | IRQF_IRQPOLL,
},
};
static int __init sprd_timer_init(struct device_node *np)
{
int ret;
ret = timer_of_init(np, &to);
if (ret)
return ret;
sprd_timer_enable_interrupt(timer_of_base(&to));
clockevents_config_and_register(&to.clkevt, timer_of_rate(&to),
1, UINT_MAX);
return 0;
}
TIMER_OF_DECLARE(sc9860_timer, "sprd,sc9860-timer", sprd_timer_init);

364
drivers/clocksource/timer-stm32.c
View File

@ -9,6 +9,7 @@
#include <linux/kernel.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/of.h>
@ -16,175 +17,318 @@
#include <linux/of_irq.h>
#include <linux/clk.h>
#include <linux/reset.h>
#include <linux/sched_clock.h>
#include <linux/slab.h>
#include "timer-of.h"
#define TIM_CR1 0x00
#define TIM_DIER 0x0c
#define TIM_SR 0x10
#define TIM_EGR 0x14
#define TIM_CNT 0x24
#define TIM_PSC 0x28
#define TIM_ARR 0x2c
#define TIM_CCR1 0x34
#define TIM_CR1_CEN BIT(0)
#define TIM_CR1_UDIS BIT(1)
#define TIM_CR1_OPM BIT(3)
#define TIM_CR1_ARPE BIT(7)
#define TIM_DIER_UIE BIT(0)
#define TIM_DIER_CC1IE BIT(1)
#define TIM_SR_UIF BIT(0)
#define TIM_EGR_UG BIT(0)
struct stm32_clock_event_ddata {
struct clock_event_device evtdev;
unsigned periodic_top;
void __iomem *base;
#define TIM_PSC_MAX USHRT_MAX
#define TIM_PSC_CLKRATE 10000
struct stm32_timer_private {
int bits;
};
static int stm32_clock_event_shutdown(struct clock_event_device *evtdev)
/**
* stm32_timer_of_bits_set - set accessor helper
* @to: a timer_of structure pointer
* @bits: the number of bits (16 or 32)
*
* Accessor helper to set the number of bits in the timer-of private
* structure.
*
*/
static void stm32_timer_of_bits_set(struct timer_of *to, int bits)
{
struct stm32_clock_event_ddata *data =
container_of(evtdev, struct stm32_clock_event_ddata, evtdev);
void *base = data->base;
struct stm32_timer_private *pd = to->private_data;
writel_relaxed(0, base + TIM_CR1);
return 0;
pd->bits = bits;
}
static int stm32_clock_event_set_periodic(struct clock_event_device *evtdev)
/**
* stm32_timer_of_bits_get - get accessor helper
* @to: a timer_of structure pointer
*
* Accessor helper to get the number of bits in the timer-of private
* structure.
*
* Returns an integer corresponding to the number of bits.
*/
static int stm32_timer_of_bits_get(struct timer_of *to)
{
struct stm32_clock_event_ddata *data =
container_of(evtdev, struct stm32_clock_event_ddata, evtdev);
void *base = data->base;
struct stm32_timer_private *pd = to->private_data;
return pd->bits;
}
static void __iomem *stm32_timer_cnt __read_mostly;
static u64 notrace stm32_read_sched_clock(void)
{
return readl_relaxed(stm32_timer_cnt);
}
static struct delay_timer stm32_timer_delay;
static unsigned long stm32_read_delay(void)
{
return readl_relaxed(stm32_timer_cnt);
}
static void stm32_clock_event_disable(struct timer_of *to)
{
writel_relaxed(0, timer_of_base(to) + TIM_DIER);
}
/**
* stm32_timer_start - Start the counter without event
* @to: a timer_of structure pointer
*
* Start the timer in order to have the counter reset and start
* incrementing but disable interrupt event when there is a counter
* overflow. By default, the counter direction is used as upcounter.
*/
static void stm32_timer_start(struct timer_of *to)
{
writel_relaxed(TIM_CR1_UDIS | TIM_CR1_CEN, timer_of_base(to) + TIM_CR1);
}
static int stm32_clock_event_shutdown(struct clock_event_device *clkevt)
{
struct timer_of *to = to_timer_of(clkevt);
stm32_clock_event_disable(to);
writel_relaxed(data->periodic_top, base + TIM_ARR);
writel_relaxed(TIM_CR1_ARPE | TIM_CR1_CEN, base + TIM_CR1);
return 0;
}
static int stm32_clock_event_set_next_event(unsigned long evt,
struct clock_event_device *evtdev)
struct clock_event_device *clkevt)
{
struct stm32_clock_event_ddata *data =
container_of(evtdev, struct stm32_clock_event_ddata, evtdev);
struct timer_of *to = to_timer_of(clkevt);
unsigned long now, next;
writel_relaxed(evt, data->base + TIM_ARR);
writel_relaxed(TIM_CR1_ARPE | TIM_CR1_OPM | TIM_CR1_CEN,
data->base + TIM_CR1);
next = readl_relaxed(timer_of_base(to) + TIM_CNT) + evt;
writel_relaxed(next, timer_of_base(to) + TIM_CCR1);
now = readl_relaxed(timer_of_base(to) + TIM_CNT);
if ((next - now) > evt)
return -ETIME;
writel_relaxed(TIM_DIER_CC1IE, timer_of_base(to) + TIM_DIER);
return 0;
}
static int stm32_clock_event_set_periodic(struct clock_event_device *clkevt)
{
struct timer_of *to = to_timer_of(clkevt);
stm32_timer_start(to);
return stm32_clock_event_set_next_event(timer_of_period(to), clkevt);
}
static int stm32_clock_event_set_oneshot(struct clock_event_device *clkevt)
{
struct timer_of *to = to_timer_of(clkevt);
stm32_timer_start(to);
return 0;
}
static irqreturn_t stm32_clock_event_handler(int irq, void *dev_id)
{
struct stm32_clock_event_ddata *data = dev_id;
struct clock_event_device *clkevt = (struct clock_event_device *)dev_id;
struct timer_of *to = to_timer_of(clkevt);
writel_relaxed(0, data->base + TIM_SR);
writel_relaxed(0, timer_of_base(to) + TIM_SR);
data->evtdev.event_handler(&data->evtdev);
if (clockevent_state_periodic(clkevt))
stm32_clock_event_set_periodic(clkevt);
else
stm32_clock_event_shutdown(clkevt);
clkevt->event_handler(clkevt);
return IRQ_HANDLED;
}
static struct stm32_clock_event_ddata clock_event_ddata = {
.evtdev = {
.name = "stm32 clockevent",
.features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC,
.set_state_shutdown = stm32_clock_event_shutdown,
.set_state_periodic = stm32_clock_event_set_periodic,
.set_state_oneshot = stm32_clock_event_shutdown,
.tick_resume = stm32_clock_event_shutdown,
.set_next_event = stm32_clock_event_set_next_event,
.rating = 200,
},
};
static int __init stm32_clockevent_init(struct device_node *np)
/**
* stm32_timer_width - Sort out the timer width (32/16)
* @to: a pointer to a timer-of structure
*
* Write the 32-bit max value and read/return the result. If the timer
* is 32 bits wide, the result will be UINT_MAX, otherwise it will
* be truncated by the 16-bit register to USHRT_MAX.
*
*/
static void __init stm32_timer_set_width(struct timer_of *to)
{
u32 width;
writel_relaxed(UINT_MAX, timer_of_base(to) + TIM_ARR);
width = readl_relaxed(timer_of_base(to) + TIM_ARR);
stm32_timer_of_bits_set(to, width == UINT_MAX ? 32 : 16);
}
/**
* stm32_timer_set_prescaler - Compute and set the prescaler register
* @to: a pointer to a timer-of structure
*
* Depending on the timer width, compute the prescaler to always
* target a 10MHz timer rate for 16 bits. 32-bit timers are
* considered precise and long enough to not use the prescaler.
*/
static void __init stm32_timer_set_prescaler(struct timer_of *to)
{
int prescaler = 1;
if (stm32_timer_of_bits_get(to) != 32) {
prescaler = DIV_ROUND_CLOSEST(timer_of_rate(to),
TIM_PSC_CLKRATE);
/*
* The prescaler register is an u16, the variable
* can't be greater than TIM_PSC_MAX, let's cap it in
* this case.
*/
prescaler = prescaler < TIM_PSC_MAX ? prescaler : TIM_PSC_MAX;
}
writel_relaxed(prescaler - 1, timer_of_base(to) + TIM_PSC);
writel_relaxed(TIM_EGR_UG, timer_of_base(to) + TIM_EGR);
writel_relaxed(0, timer_of_base(to) + TIM_SR);
/* Adjust rate and period given the prescaler value */
to->of_clk.rate = DIV_ROUND_CLOSEST(to->of_clk.rate, prescaler);
to->of_clk.period = DIV_ROUND_UP(to->of_clk.rate, HZ);
}
static int __init stm32_clocksource_init(struct timer_of *to)
{
u32 bits = stm32_timer_of_bits_get(to);
const char *name = to->np->full_name;
/*
* This driver allows to register several timers and relies on
* the generic time framework to select the right one.
* However, nothing allows to do the same for the
* sched_clock. We are not interested in a sched_clock for the
* 16-bit timers but only for the 32-bit one, so if no 32-bit
* timer is registered yet, we select this 32-bit timer as a
* sched_clock.
*/
if (bits == 32 && !stm32_timer_cnt) {
/*
* Start immediately the counter as we will be using
* it right after.
*/
stm32_timer_start(to);
stm32_timer_cnt = timer_of_base(to) + TIM_CNT;
sched_clock_register(stm32_read_sched_clock, bits, timer_of_rate(to));
pr_info("%s: STM32 sched_clock registered\n", name);
stm32_timer_delay.read_current_timer = stm32_read_delay;
stm32_timer_delay.freq = timer_of_rate(to);
register_current_timer_delay(&stm32_timer_delay);
pr_info("%s: STM32 delay timer registered\n", name);
}
return clocksource_mmio_init(timer_of_base(to) + TIM_CNT, name,
timer_of_rate(to), bits == 32 ? 250 : 100,
bits, clocksource_mmio_readl_up);
}
static void __init stm32_clockevent_init(struct timer_of *to)
{
u32 bits = stm32_timer_of_bits_get(to);
to->clkevt.name = to->np->full_name;
to->clkevt.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
to->clkevt.set_state_shutdown = stm32_clock_event_shutdown;
to->clkevt.set_state_periodic = stm32_clock_event_set_periodic;
to->clkevt.set_state_oneshot = stm32_clock_event_set_oneshot;
to->clkevt.tick_resume = stm32_clock_event_shutdown;
to->clkevt.set_next_event = stm32_clock_event_set_next_event;
to->clkevt.rating = bits == 32 ? 250 : 100;
clockevents_config_and_register(&to->clkevt, timer_of_rate(to), 0x1,
(1 << bits) - 1);
pr_info("%pOF: STM32 clockevent driver initialized (%d bits)\n",
to->np, bits);
}
static int __init stm32_timer_init(struct device_node *node)
{
struct stm32_clock_event_ddata *data = &clock_event_ddata;
struct clk *clk;
struct reset_control *rstc;
unsigned long rate, max_delta;
int irq, ret, bits, prescaler = 1;
struct timer_of *to;
int ret;
clk = of_clk_get(np, 0);
if (IS_ERR(clk)) {
ret = PTR_ERR(clk);
pr_err("failed to get clock for clockevent (%d)\n", ret);
goto err_clk_get;
}
to = kzalloc(sizeof(*to), GFP_KERNEL);
if (!to)
return -ENOMEM;
ret = clk_prepare_enable(clk);
if (ret) {
pr_err("failed to enable timer clock for clockevent (%d)\n",
ret);
goto err_clk_enable;
}
to->flags = TIMER_OF_IRQ | TIMER_OF_CLOCK | TIMER_OF_BASE;
to->of_irq.handler = stm32_clock_event_handler;
rate = clk_get_rate(clk);
ret = timer_of_init(node, to);
if (ret)
goto err;
rstc = of_reset_control_get(np, NULL);
to->private_data = kzalloc(sizeof(struct stm32_timer_private),
GFP_KERNEL);
if (!to->private_data)
goto deinit;
rstc = of_reset_control_get(node, NULL);
if (!IS_ERR(rstc)) {
reset_control_assert(rstc);
reset_control_deassert(rstc);
}
data->base = of_iomap(np, 0);
if (!data->base) {
ret = -ENXIO;
pr_err("failed to map registers for clockevent\n");
goto err_iomap;
}
stm32_timer_set_width(to);
irq = irq_of_parse_and_map(np, 0);
if (!irq) {
ret = -EINVAL;
pr_err("%pOF: failed to get irq.\n", np);
goto err_get_irq;
}
stm32_timer_set_prescaler(to);
/* Detect whether the timer is 16 or 32 bits */
writel_relaxed(~0U, data->base + TIM_ARR);
max_delta = readl_relaxed(data->base + TIM_ARR);
if (max_delta == ~0U) {
prescaler = 1;
bits = 32;
} else {
prescaler = 1024;
bits = 16;
}
writel_relaxed(0, data->base + TIM_ARR);
ret = stm32_clocksource_init(to);
if (ret)
goto deinit;
writel_relaxed(prescaler - 1, data->base + TIM_PSC);
writel_relaxed(TIM_EGR_UG, data->base + TIM_EGR);
writel_relaxed(TIM_DIER_UIE, data->base + TIM_DIER);
writel_relaxed(0, data->base + TIM_SR);
stm32_clockevent_init(to);
return 0;
data->periodic_top = DIV_ROUND_CLOSEST(rate, prescaler * HZ);
clockevents_config_and_register(&data->evtdev,
DIV_ROUND_CLOSEST(rate, prescaler),
0x1, max_delta);
ret = request_irq(irq, stm32_clock_event_handler, IRQF_TIMER,
"stm32 clockevent", data);
if (ret) {
pr_err("%pOF: failed to request irq.\n", np);
goto err_get_irq;
}
pr_info("%pOF: STM32 clockevent driver initialized (%d bits)\n",
np, bits);
return ret;
err_get_irq:
iounmap(data->base);
err_iomap:
clk_disable_unprepare(clk);
err_clk_enable:
clk_put(clk);
err_clk_get:
deinit:
timer_of_cleanup(to);
err:
kfree(to);
return ret;
}
TIMER_OF_DECLARE(stm32, "st,stm32-timer", stm32_clockevent_init);
TIMER_OF_DECLARE(stm32, "st,stm32-timer", stm32_timer_init);

30
drivers/usb/gadget/function/f_ncm.c
View File

@ -73,9 +73,7 @@ struct f_ncm {
struct sk_buff *skb_tx_ndp;
u16 ndp_dgram_count;
bool timer_force_tx;
struct tasklet_struct tx_tasklet;
struct hrtimer task_timer;
bool timer_stopping;
};
@ -1104,7 +1102,7 @@ static struct sk_buff *ncm_wrap_ntb(struct gether *port,
/* Delay the timer. */
hrtimer_start(&ncm->task_timer, TX_TIMEOUT_NSECS,
HRTIMER_MODE_REL);
HRTIMER_MODE_REL_SOFT);
/* Add the datagram position entries */
ntb_ndp = skb_put_zero(ncm->skb_tx_ndp, dgram_idx_len);
@ -1148,17 +1146,15 @@ static struct sk_buff *ncm_wrap_ntb(struct gether *port,
}
/*
* This transmits the NTB if there are frames waiting.
* The transmit should only be run if no skb data has been sent
* for a certain duration.
*/
static void ncm_tx_tasklet(unsigned long data)
static enum hrtimer_restart ncm_tx_timeout(struct hrtimer *data)
{
struct f_ncm *ncm = (void *)data;
if (ncm->timer_stopping)
return;
struct f_ncm *ncm = container_of(data, struct f_ncm, task_timer);
/* Only send if data is available. */
if (ncm->skb_tx_data) {
if (!ncm->timer_stopping && ncm->skb_tx_data) {
ncm->timer_force_tx = true;
/* XXX This allowance of a NULL skb argument to ndo_start_xmit
@ -1171,16 +1167,6 @@ static void ncm_tx_tasklet(unsigned long data)
ncm->timer_force_tx = false;
}
}
/*
* The transmit should only be run if no skb data has been sent
* for a certain duration.
*/
static enum hrtimer_restart ncm_tx_timeout(struct hrtimer *data)
{
struct f_ncm *ncm = container_of(data, struct f_ncm, task_timer);
tasklet_schedule(&ncm->tx_tasklet);
return HRTIMER_NORESTART;
}
@ -1513,8 +1499,7 @@ static int ncm_bind(struct usb_configuration *c, struct usb_function *f)
ncm->port.open = ncm_open;
ncm->port.close = ncm_close;
tasklet_init(&ncm->tx_tasklet, ncm_tx_tasklet, (unsigned long) ncm);
hrtimer_init(&ncm->task_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer_init(&ncm->task_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
ncm->task_timer.function = ncm_tx_timeout;
DBG(cdev, "CDC Network: %s speed IN/%s OUT/%s NOTIFY/%s\n",
@ -1623,7 +1608,6 @@ static void ncm_unbind(struct usb_configuration *c, struct usb_function *f)
DBG(c->cdev, "ncm unbind\n");
hrtimer_cancel(&ncm->task_timer);
tasklet_kill(&ncm->tx_tasklet);
ncm_string_defs[0].id = 0;
usb_free_all_descriptors(f);

113
include/linux/hrtimer.h
View File

@ -28,13 +28,29 @@ struct hrtimer_cpu_base;
/*
* Mode arguments of xxx_hrtimer functions:
*
* HRTIMER_MODE_ABS - Time value is absolute
* HRTIMER_MODE_REL - Time value is relative to now
* HRTIMER_MODE_PINNED - Timer is bound to CPU (is only considered
* when starting the timer)
* HRTIMER_MODE_SOFT - Timer callback function will be executed in
* soft irq context
*/
enum hrtimer_mode {
HRTIMER_MODE_ABS = 0x0, /* Time value is absolute */
HRTIMER_MODE_REL = 0x1, /* Time value is relative to now */
HRTIMER_MODE_PINNED = 0x02, /* Timer is bound to CPU */
HRTIMER_MODE_ABS_PINNED = 0x02,
HRTIMER_MODE_REL_PINNED = 0x03,
HRTIMER_MODE_ABS = 0x00,
HRTIMER_MODE_REL = 0x01,
HRTIMER_MODE_PINNED = 0x02,
HRTIMER_MODE_SOFT = 0x04,
HRTIMER_MODE_ABS_PINNED = HRTIMER_MODE_ABS | HRTIMER_MODE_PINNED,
HRTIMER_MODE_REL_PINNED = HRTIMER_MODE_REL | HRTIMER_MODE_PINNED,
HRTIMER_MODE_ABS_SOFT = HRTIMER_MODE_ABS | HRTIMER_MODE_SOFT,
HRTIMER_MODE_REL_SOFT = HRTIMER_MODE_REL | HRTIMER_MODE_SOFT,
HRTIMER_MODE_ABS_PINNED_SOFT = HRTIMER_MODE_ABS_PINNED | HRTIMER_MODE_SOFT,
HRTIMER_MODE_REL_PINNED_SOFT = HRTIMER_MODE_REL_PINNED | HRTIMER_MODE_SOFT,
};
/*
@ -87,6 +103,7 @@ enum hrtimer_restart {
* @base: pointer to the timer base (per cpu and per clock)
* @state: state information (See bit values above)
* @is_rel: Set if the timer was armed relative
* @is_soft: Set if hrtimer will be expired in soft interrupt context.
*
* The hrtimer structure must be initialized by hrtimer_init()
*/
@ -97,6 +114,7 @@ struct hrtimer {
struct hrtimer_clock_base *base;
u8 state;
u8 is_rel;
u8 is_soft;
};
/**
@ -112,9 +130,9 @@ struct hrtimer_sleeper {
};
#ifdef CONFIG_64BIT
# define HRTIMER_CLOCK_BASE_ALIGN 64
# define __hrtimer_clock_base_align ____cacheline_aligned
#else
# define HRTIMER_CLOCK_BASE_ALIGN 32
# define __hrtimer_clock_base_align
#endif
/**
@ -123,48 +141,57 @@ struct hrtimer_sleeper {
* @index: clock type index for per_cpu support when moving a
* timer to a base on another cpu.
* @clockid: clock id for per_cpu support
* @seq: seqcount around __run_hrtimer
* @running: pointer to the currently running hrtimer
* @active: red black tree root node for the active timers
* @get_time: function to retrieve the current time of the clock
* @offset: offset of this clock to the monotonic base
*/
struct hrtimer_clock_base {
struct hrtimer_cpu_base *cpu_base;
int index;
unsigned int index;
clockid_t clockid;
seqcount_t seq;
struct hrtimer *running;
struct timerqueue_head active;
ktime_t (*get_time)(void);
ktime_t offset;
} __attribute__((__aligned__(HRTIMER_CLOCK_BASE_ALIGN)));
} __hrtimer_clock_base_align;
enum hrtimer_base_type {
HRTIMER_BASE_MONOTONIC,
HRTIMER_BASE_REALTIME,
HRTIMER_BASE_BOOTTIME,
HRTIMER_BASE_TAI,
HRTIMER_BASE_MONOTONIC_SOFT,
HRTIMER_BASE_REALTIME_SOFT,
HRTIMER_BASE_BOOTTIME_SOFT,
HRTIMER_BASE_TAI_SOFT,
HRTIMER_MAX_CLOCK_BASES,
};
/*
/**
* struct hrtimer_cpu_base - the per cpu clock bases
* @lock: lock protecting the base and associated clock bases
* and timers
* @seq: seqcount around __run_hrtimer
* @running: pointer to the currently running hrtimer
* @cpu: cpu number
* @active_bases: Bitfield to mark bases with active timers
* @clock_was_set_seq: Sequence counter of clock was set events
* @migration_enabled: The migration of hrtimers to other cpus is enabled
* @nohz_active: The nohz functionality is enabled
* @expires_next: absolute time of the next event which was scheduled
* via clock_set_next_event()
* @next_timer: Pointer to the first expiring timer
* @in_hrtirq: hrtimer_interrupt() is currently executing
* @hres_active: State of high resolution mode
* @in_hrtirq: hrtimer_interrupt() is currently executing
* @hang_detected: The last hrtimer interrupt detected a hang
* @softirq_activated: displays, if the softirq is raised - update of softirq
* related settings is not required then.
* @nr_events: Total number of hrtimer interrupt events
* @nr_retries: Total number of hrtimer interrupt retries
* @nr_hangs: Total number of hrtimer interrupt hangs
* @max_hang_time: Maximum time spent in hrtimer_interrupt
* @expires_next: absolute time of the next event, is required for remote
* hrtimer enqueue; it is the total first expiry time (hard
* and soft hrtimer are taken into account)
* @next_timer: Pointer to the first expiring timer
* @softirq_expires_next: Time to check, if soft queues needs also to be expired
* @softirq_next_timer: Pointer to the first expiring softirq based timer
* @clock_base: array of clock bases for this cpu
*
* Note: next_timer is just an optimization for __remove_hrtimer().
@ -173,31 +200,28 @@ enum hrtimer_base_type {
*/
struct hrtimer_cpu_base {
raw_spinlock_t lock;
seqcount_t seq;
struct hrtimer *running;
unsigned int cpu;
unsigned int active_bases;
unsigned int clock_was_set_seq;
bool migration_enabled;
bool nohz_active;
unsigned int hres_active : 1,
in_hrtirq : 1,
hang_detected : 1,
softirq_activated : 1;
#ifdef CONFIG_HIGH_RES_TIMERS
unsigned int in_hrtirq : 1,
hres_active : 1,
hang_detected : 1;
ktime_t expires_next;
struct hrtimer *next_timer;
unsigned int nr_events;
unsigned int nr_retries;
unsigned int nr_hangs;
unsigned short nr_retries;
unsigned short nr_hangs;
unsigned int max_hang_time;
#endif
ktime_t expires_next;
struct hrtimer *next_timer;
ktime_t softirq_expires_next;
struct hrtimer *softirq_next_timer;
struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
} ____cacheline_aligned;
static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)
{
BUILD_BUG_ON(sizeof(struct hrtimer_clock_base) > HRTIMER_CLOCK_BASE_ALIGN);
timer->node.expires = time;
timer->_softexpires = time;
}
@ -266,16 +290,17 @@ static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer)
return timer->base->get_time();
}
static inline int hrtimer_is_hres_active(struct hrtimer *timer)
{
return IS_ENABLED(CONFIG_HIGH_RES_TIMERS) ?
timer->base->cpu_base->hres_active : 0;
}
#ifdef CONFIG_HIGH_RES_TIMERS
struct clock_event_device;
extern void hrtimer_interrupt(struct clock_event_device *dev);
static inline int hrtimer_is_hres_active(struct hrtimer *timer)
{
return timer->base->cpu_base->hres_active;
}
/*
* The resolution of the clocks. The resolution value is returned in
* the clock_getres() system call to give application programmers an
@ -298,11 +323,6 @@ extern unsigned int hrtimer_resolution;
#define hrtimer_resolution (unsigned int)LOW_RES_NSEC
static inline int hrtimer_is_hres_active(struct hrtimer *timer)
{
return 0;
}
static inline void clock_was_set_delayed(void) { }
#endif
@ -365,11 +385,12 @@ extern void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
u64 range_ns, const enum hrtimer_mode mode);
/**
* hrtimer_start - (re)start an hrtimer on the current CPU
* hrtimer_start - (re)start an hrtimer
* @timer: the timer to be added
* @tim: expiry time
* @mode: expiry mode: absolute (HRTIMER_MODE_ABS) or
* relative (HRTIMER_MODE_REL)
* @mode: timer mode: absolute (HRTIMER_MODE_ABS) or
* relative (HRTIMER_MODE_REL), and pinned (HRTIMER_MODE_PINNED);
* softirq based mode is considered for debug purpose only!
*/
static inline void hrtimer_start(struct hrtimer *timer, ktime_t tim,
const enum hrtimer_mode mode)
@ -422,7 +443,7 @@ static inline int hrtimer_is_queued(struct hrtimer *timer)
*/
static inline int hrtimer_callback_running(struct hrtimer *timer)
{
return timer->base->cpu_base->running == timer;
return timer->base->running == timer;
}
/* Forward a hrtimer so it expires after now: */
@ -466,7 +487,7 @@ extern int schedule_hrtimeout_range(ktime_t *expires, u64 delta,
extern int schedule_hrtimeout_range_clock(ktime_t *expires,
u64 delta,
const enum hrtimer_mode mode,
int clock);
clockid_t clock_id);
extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode);
/* Soft interrupt function to run the hrtimer queues: */

25
include/linux/posix-timers.h
View File

@ -42,13 +42,26 @@ struct cpu_timer_list {
#define CLOCKFD CPUCLOCK_MAX
#define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK)
#define MAKE_PROCESS_CPUCLOCK(pid, clock) \
((~(clockid_t) (pid) << 3) | (clockid_t) (clock))
#define MAKE_THREAD_CPUCLOCK(tid, clock) \
MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK)
static inline clockid_t make_process_cpuclock(const unsigned int pid,
const clockid_t clock)
{
return ((~pid) << 3) | clock;
}
static inline clockid_t make_thread_cpuclock(const unsigned int tid,
const clockid_t clock)
{
return make_process_cpuclock(tid, clock | CPUCLOCK_PERTHREAD_MASK);
}
#define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD)
#define CLOCKID_TO_FD(clk) ((unsigned int) ~((clk) >> 3))
static inline clockid_t fd_to_clockid(const int fd)
{
return make_process_cpuclock((unsigned int) fd, CLOCKFD);
}
static inline int clockid_to_fd(const clockid_t clk)
{
return ~(clk >> 3);
}
#define REQUEUE_PENDING 1

37
include/trace/events/timer.h
View File

@ -136,6 +136,24 @@ DEFINE_EVENT(timer_class, timer_cancel,
TP_ARGS(timer)
);
#define decode_clockid(type) \
__print_symbolic(type, \
{ CLOCK_REALTIME, "CLOCK_REALTIME" }, \
{ CLOCK_MONOTONIC, "CLOCK_MONOTONIC" }, \
{ CLOCK_BOOTTIME, "CLOCK_BOOTTIME" }, \
{ CLOCK_TAI, "CLOCK_TAI" })
#define decode_hrtimer_mode(mode) \
__print_symbolic(mode, \
{ HRTIMER_MODE_ABS, "ABS" }, \
{ HRTIMER_MODE_REL, "REL" }, \
{ HRTIMER_MODE_ABS_PINNED, "ABS|PINNED" }, \
{ HRTIMER_MODE_REL_PINNED, "REL|PINNED" }, \
{ HRTIMER_MODE_ABS_SOFT, "ABS|SOFT" }, \
{ HRTIMER_MODE_REL_SOFT, "REL|SOFT" }, \
{ HRTIMER_MODE_ABS_PINNED_SOFT, "ABS|PINNED|SOFT" }, \
{ HRTIMER_MODE_REL_PINNED_SOFT, "REL|PINNED|SOFT" })
/**
* hrtimer_init - called when the hrtimer is initialized
* @hrtimer: pointer to struct hrtimer
@ -162,10 +180,8 @@ TRACE_EVENT(hrtimer_init,
),
TP_printk("hrtimer=%p clockid=%s mode=%s", __entry->hrtimer,
__entry->clockid == CLOCK_REALTIME ?
"CLOCK_REALTIME" : "CLOCK_MONOTONIC",
__entry->mode == HRTIMER_MODE_ABS ?
"HRTIMER_MODE_ABS" : "HRTIMER_MODE_REL")
decode_clockid(__entry->clockid),
decode_hrtimer_mode(__entry->mode))
);
/**
@ -174,15 +190,16 @@ TRACE_EVENT(hrtimer_init,
*/
TRACE_EVENT(hrtimer_start,
TP_PROTO(struct hrtimer *hrtimer),
TP_PROTO(struct hrtimer *hrtimer, enum hrtimer_mode mode),
TP_ARGS(hrtimer),
TP_ARGS(hrtimer, mode),
TP_STRUCT__entry(
__field( void *, hrtimer )
__field( void *, function )
__field( s64, expires )
__field( s64, softexpires )
__field( enum hrtimer_mode, mode )
),
TP_fast_assign(
@ -190,12 +207,14 @@ TRACE_EVENT(hrtimer_start,
__entry->function = hrtimer->function;
__entry->expires = hrtimer_get_expires(hrtimer);
__entry->softexpires = hrtimer_get_softexpires(hrtimer);
__entry->mode = mode;
),
TP_printk("hrtimer=%p function=%pf expires=%llu softexpires=%llu",
__entry->hrtimer, __entry->function,
TP_printk("hrtimer=%p function=%pf expires=%llu softexpires=%llu "
"mode=%s", __entry->hrtimer, __entry->function,
(unsigned long long) __entry->expires,
(unsigned long long) __entry->softexpires)
(unsigned long long) __entry->softexpires,
decode_hrtimer_mode(__entry->mode))
);
/**

723
kernel/time/hrtimer.c
View File

File diff suppressed because it is too large Load Diff

2
kernel/time/posix-clock.c
View File

@ -216,7 +216,7 @@ struct posix_clock_desc {
static int get_clock_desc(const clockid_t id, struct posix_clock_desc *cd)
{
struct file *fp = fget(CLOCKID_TO_FD(id));
struct file *fp = fget(clockid_to_fd(id));
int err = -EINVAL;
if (!fp)

7
kernel/time/posix-cpu-timers.c
View File

@ -1189,9 +1189,8 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
u64 now;
WARN_ON_ONCE(clock_idx == CPUCLOCK_SCHED);
cpu_timer_sample_group(clock_idx, tsk, &now);
if (oldval) {
if (oldval && cpu_timer_sample_group(clock_idx, tsk, &now) != -EINVAL) {
/*
* We are setting itimer. The *oldval is absolute and we update
* it to be relative, *newval argument is relative and we update
@ -1363,8 +1362,8 @@ static long posix_cpu_nsleep_restart(struct restart_block *restart_block)
return do_cpu_nanosleep(which_clock, TIMER_ABSTIME, &t);
}
#define PROCESS_CLOCK MAKE_PROCESS_CPUCLOCK(0, CPUCLOCK_SCHED)
#define THREAD_CLOCK MAKE_THREAD_CPUCLOCK(0, CPUCLOCK_SCHED)
#define PROCESS_CLOCK make_process_cpuclock(0, CPUCLOCK_SCHED)
#define THREAD_CLOCK make_thread_cpuclock(0, CPUCLOCK_SCHED)
static int process_cpu_clock_getres(const clockid_t which_clock,
struct timespec64 *tp)

13
kernel/time/tick-internal.h
View File

@ -150,16 +150,15 @@ static inline void tick_nohz_init(void) { }
#ifdef CONFIG_NO_HZ_COMMON
extern unsigned long tick_nohz_active;
#else
extern void timers_update_nohz(void);
# ifdef CONFIG_SMP
extern struct static_key_false timers_migration_enabled;
# endif
#else /* CONFIG_NO_HZ_COMMON */
static inline void timers_update_nohz(void) { }
#define tick_nohz_active (0)
#endif
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
extern void timers_update_migration(bool update_nohz);
#else
static inline void timers_update_migration(bool update_nohz) { }
#endif
DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);

2
kernel/time/tick-sched.c
View File

@ -1107,7 +1107,7 @@ static inline void tick_nohz_activate(struct tick_sched *ts, int mode)
ts->nohz_mode = mode;
/* One update is enough */
if (!test_and_set_bit(0, &tick_nohz_active))
timers_update_migration(true);
timers_update_nohz();
}
/**

90
kernel/time/timer.c
View File

@ -200,8 +200,6 @@ struct timer_base {
unsigned long clk;
unsigned long next_expiry;
unsigned int cpu;
bool migration_enabled;
bool nohz_active;
bool is_idle;
bool must_forward_clk;
DECLARE_BITMAP(pending_map, WHEEL_SIZE);
@ -210,45 +208,64 @@ struct timer_base {
static DEFINE_PER_CPU(struct timer_base, timer_bases[NR_BASES]);
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
#ifdef CONFIG_NO_HZ_COMMON
static DEFINE_STATIC_KEY_FALSE(timers_nohz_active);
static DEFINE_MUTEX(timer_keys_mutex);
static void timer_update_keys(struct work_struct *work);
static DECLARE_WORK(timer_update_work, timer_update_keys);
#ifdef CONFIG_SMP
unsigned int sysctl_timer_migration = 1;
void timers_update_migration(bool update_nohz)
DEFINE_STATIC_KEY_FALSE(timers_migration_enabled);
static void timers_update_migration(void)
{
bool on = sysctl_timer_migration && tick_nohz_active;
unsigned int cpu;
if (sysctl_timer_migration && tick_nohz_active)
static_branch_enable(&timers_migration_enabled);
else
static_branch_disable(&timers_migration_enabled);
}
#else
static inline void timers_update_migration(void) { }
#endif /* !CONFIG_SMP */
/* Avoid the loop, if nothing to update */
if (this_cpu_read(timer_bases[BASE_STD].migration_enabled) == on)
return;
static void timer_update_keys(struct work_struct *work)
{
mutex_lock(&timer_keys_mutex);
timers_update_migration();
static_branch_enable(&timers_nohz_active);
mutex_unlock(&timer_keys_mutex);
}
for_each_possible_cpu(cpu) {
per_cpu(timer_bases[BASE_STD].migration_enabled, cpu) = on;
per_cpu(timer_bases[BASE_DEF].migration_enabled, cpu) = on;
per_cpu(hrtimer_bases.migration_enabled, cpu) = on;
if (!update_nohz)
continue;
per_cpu(timer_bases[BASE_STD].nohz_active, cpu) = true;
per_cpu(timer_bases[BASE_DEF].nohz_active, cpu) = true;
per_cpu(hrtimer_bases.nohz_active, cpu) = true;
}
void timers_update_nohz(void)
{
schedule_work(&timer_update_work);
}
int timer_migration_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
{
static DEFINE_MUTEX(mutex);
int ret;
mutex_lock(&mutex);
mutex_lock(&timer_keys_mutex);
ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
if (!ret && write)
timers_update_migration(false);
mutex_unlock(&mutex);
timers_update_migration();
mutex_unlock(&timer_keys_mutex);
return ret;
}
#endif
static inline bool is_timers_nohz_active(void)
{
return static_branch_unlikely(&timers_nohz_active);
}
#else
static inline bool is_timers_nohz_active(void) { return false; }
#endif /* NO_HZ_COMMON */
static unsigned long round_jiffies_common(unsigned long j, int cpu,
bool force_up)
@ -534,7 +551,7 @@ __internal_add_timer(struct timer_base *base, struct timer_list *timer)
static void
trigger_dyntick_cpu(struct timer_base *base, struct timer_list *timer)
{
if (!IS_ENABLED(CONFIG_NO_HZ_COMMON) || !base->nohz_active)
if (!is_timers_nohz_active())
return;
/*
@ -849,21 +866,20 @@ static inline struct timer_base *get_timer_base(u32 tflags)
return get_timer_cpu_base(tflags, tflags & TIMER_CPUMASK);
}
#ifdef CONFIG_NO_HZ_COMMON
static inline struct timer_base *
get_target_base(struct timer_base *base, unsigned tflags)
{
#ifdef CONFIG_SMP
if ((tflags & TIMER_PINNED) || !base->migration_enabled)
return get_timer_this_cpu_base(tflags);
return get_timer_cpu_base(tflags, get_nohz_timer_target());
#else
return get_timer_this_cpu_base(tflags);
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
if (static_branch_likely(&timers_migration_enabled) &&
!(tflags & TIMER_PINNED))
return get_timer_cpu_base(tflags, get_nohz_timer_target());
#endif
return get_timer_this_cpu_base(tflags);
}
static inline void forward_timer_base(struct timer_base *base)
{
#ifdef CONFIG_NO_HZ_COMMON
unsigned long jnow;
/*
@ -887,16 +903,8 @@ static inline void forward_timer_base(struct timer_base *base)
base->clk = jnow;
else
base->clk = base->next_expiry;
}
#else
static inline struct timer_base *
get_target_base(struct timer_base *base, unsigned tflags)
{
return get_timer_this_cpu_base(tflags);
}
static inline void forward_timer_base(struct timer_base *base) { }
#endif
}
/*

27
sound/drivers/dummy.c
View File

@ -375,17 +375,9 @@ struct dummy_hrtimer_pcm {
ktime_t period_time;
atomic_t running;
struct hrtimer timer;
struct tasklet_struct tasklet;
struct snd_pcm_substream *substream;
};
static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
{
struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
if (atomic_read(&dpcm->running))
snd_pcm_period_elapsed(dpcm->substream);
}
static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
{
struct dummy_hrtimer_pcm *dpcm;
@ -393,7 +385,14 @@ static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
if (!atomic_read(&dpcm->running))
return HRTIMER_NORESTART;
tasklet_schedule(&dpcm->tasklet);
/*
* In cases of XRUN and draining, this calls .trigger to stop PCM
* substream.
*/
snd_pcm_period_elapsed(dpcm->substream);
if (!atomic_read(&dpcm->running))
return HRTIMER_NORESTART;
hrtimer_forward_now(timer, dpcm->period_time);
return HRTIMER_RESTART;
}
@ -403,7 +402,7 @@ static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL_SOFT);
atomic_set(&dpcm->running, 1);
return 0;
}
@ -413,14 +412,14 @@ static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
atomic_set(&dpcm->running, 0);
hrtimer_cancel(&dpcm->timer);
if (!hrtimer_callback_running(&dpcm->timer))
hrtimer_cancel(&dpcm->timer);
return 0;
}
static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
{
hrtimer_cancel(&dpcm->timer);
tasklet_kill(&dpcm->tasklet);
}
static snd_pcm_uframes_t
@ -465,12 +464,10 @@ static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
if (!dpcm)
return -ENOMEM;
substream->runtime->private_data = dpcm;
hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
dpcm->timer.function = dummy_hrtimer_callback;
dpcm->substream = substream;
atomic_set(&dpcm->running, 0);
tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
(unsigned long)dpcm);
return 0;
}

4
tools/testing/selftests/ptp/testptp.c
View File

@ -60,9 +60,7 @@ static int clock_adjtime(clockid_t id, struct timex *tx)
static clockid_t get_clockid(int fd)
{
#define CLOCKFD 3
#define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD)
return FD_TO_CLOCKID(fd);
return (((unsigned int) ~fd) << 3) | CLOCKFD;
}
static void handle_alarm(int s)