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

Browse Source 
Pull timer updates from Thomas Gleixner:
 "Nothing really exciting this time:

   - a few fixlets in the NOHZ code

   - a new ARM SoC timer abomination.  One should expect that we have
     enough of them already, but they insist on inventing new ones.

   - the usual bunch of ARM SoC timer updates.  That feels like herding
     cats"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  clocksource: arm_arch_timer: Consolidate arch_timer_evtstrm_enable
  clocksource: arm_arch_timer: Enable counter access for 32-bit ARM
  clocksource: arm_arch_timer: Change clocksource name if CP15 unavailable
  clocksource: sirf: Disable counter before re-setting it
  clocksource: cadence_ttc: Add support for 32bit mode
  clocksource: tcb_clksrc: Sanitize IRQ request
  clocksource: arm_arch_timer: Discard unavailable timers correctly
  clocksource: vf_pit_timer: Support shutdown mode
  ARM: meson6: clocksource: Add Meson6 timer support
  ARM: meson: documentation: Add timer documentation
  clocksource: sh_tmu: Document r8a7779 binding
  clocksource: sh_mtu2: Document r7s72100 binding
  clocksource: sh_cmt: Document SoC specific bindings
  timerfd: Remove an always true check
  nohz: Avoid tick's double reprogramming in highres mode
  nohz: Fix spurious periodic tick behaviour in low-res dynticks mode
This commit is contained in:
Linus Torvalds 2014-10-09 06:35:05 -04:00
commit 47137c6ba1
15 changed files with 319 additions and 80 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
Documentation/devicetree/bindings/timer/amlogic,meson6-timer.txt Normal file
View File

@ -0,0 +1,15 @@
Amlogic Meson6 SoCs Timer Controller
Required properties:
- compatible : should be "amlogic,meson6-timer"
- reg : Specifies base physical address and size of the registers.
- interrupts : The interrupt of the first timer
Example:
timer@c1109940 {
compatible = "amlogic,meson6-timer";
reg = <0xc1109940 0x14>;
interrupts = <0 10 1>;
};

44
Documentation/devicetree/bindings/timer/renesas,cmt.txt
View File

@ -11,15 +11,47 @@ datasheets.
Required Properties:
- compatible: must contain one of the following.
- "renesas,cmt-32" for the 32-bit CMT
- compatible: must contain one or more of the following:
- "renesas,cmt-32-r8a7740" for the r8a7740 32-bit CMT
(CMT0)
- "renesas,cmt-32-sh7372" for the sh7372 32-bit CMT
(CMT0)
- "renesas,cmt-32-sh73a0" for the sh73a0 32-bit CMT
(CMT0)
- "renesas,cmt-32" for all 32-bit CMT without fast clock support
(CMT0 on sh7372, sh73a0 and r8a7740)
- "renesas,cmt-32-fast" for the 32-bit CMT with fast clock support
This is a fallback for the above renesas,cmt-32-* entries.
- "renesas,cmt-32-fast-r8a7740" for the r8a7740 32-bit CMT with fast
clock support (CMT[234])
- "renesas,cmt-32-fast-sh7372" for the sh7372 32-bit CMT with fast
clock support (CMT[234])
- "renesas,cmt-32-fast-sh73a0" for the sh73A0 32-bit CMT with fast
clock support (CMT[234])
- "renesas,cmt-32-fast" for all 32-bit CMT with fast clock support
(CMT[234] on sh7372, sh73a0 and r8a7740)
- "renesas,cmt-48" for the 48-bit CMT
This is a fallback for the above renesas,cmt-32-fast-* entries.
- "renesas,cmt-48-sh7372" for the sh7372 48-bit CMT
(CMT1)
- "renesas,cmt-48-sh73a0" for the sh73A0 48-bit CMT
(CMT1)
- "renesas,cmt-48-r8a7740" for the r8a7740 48-bit CMT
(CMT1)
- "renesas,cmt-48" for all non-second generation 48-bit CMT
(CMT1 on sh7372, sh73a0 and r8a7740)
- "renesas,cmt-48-gen2" for the second generation 48-bit CMT
This is a fallback for the above renesas,cmt-48-* entries.
- "renesas,cmt-48-r8a73a4" for the r8a73a4 48-bit CMT
(CMT[01])
- "renesas,cmt-48-r8a7790" for the r8a7790 48-bit CMT
(CMT[01])
- "renesas,cmt-48-r8a7791" for the r8a7791 48-bit CMT
(CMT[01])
- "renesas,cmt-48-gen2" for all second generation 48-bit CMT
(CMT[01] on r8a73a4, r8a7790 and r8a7791)
This is a fallback for the renesas,cmt-48-r8a73a4,
renesas,cmt-48-r8a7790 and renesas,cmt-48-r8a7791 entries.
- reg: base address and length of the registers block for the timer module.
- interrupts: interrupt-specifier for the timer, one per channel.
@ -36,7 +68,7 @@ Example: R8A7790 (R-Car H2) CMT0 node
them channels 0 and 1 in the documentation.
cmt0: timer@ffca0000 {
compatible = "renesas,cmt-48-gen2";
compatible = "renesas,cmt-48-r8a7790", "renesas,cmt-48-gen2";
reg = <0 0xffca0000 0 0x1004>;
interrupts = <0 142 IRQ_TYPE_LEVEL_HIGH>,
<0 142 IRQ_TYPE_LEVEL_HIGH>;

7
Documentation/devicetree/bindings/timer/renesas,mtu2.txt
View File

@ -8,7 +8,10 @@ are independent. The MTU2 hardware supports five channels indexed from 0 to 4.
Required Properties:
- compatible: must contain "renesas,mtu2"
- compatible: must be one or more of the following:
- "renesas,mtu2-r7s72100" for the r7s72100 MTU2
- "renesas,mtu2" for any MTU2
This is a fallback for the above renesas,mtu2-* entries
- reg: base address and length of the registers block for the timer module.
@ -26,7 +29,7 @@ Required Properties:
Example: R7S72100 (RZ/A1H) MTU2 node
mtu2: timer@fcff0000 {
compatible = "renesas,mtu2";
compatible = "renesas,mtu2-r7s72100", "renesas,mtu2";
reg = <0xfcff0000 0x400>;
interrupts = <0 139 IRQ_TYPE_LEVEL_HIGH>,
<0 146 IRQ_TYPE_LEVEL_HIGH>,

7
Documentation/devicetree/bindings/timer/renesas,tmu.txt
View File

@ -8,7 +8,10 @@ are independent. The TMU hardware supports up to three channels.
Required Properties:
- compatible: must contain "renesas,tmu"
- compatible: must contain one or more of the following:
- "renesas,tmu-r8a7779" for the r8a7779 TMU
- "renesas,tmu" for any TMU.
This is a fallback for the above renesas,tmu-* entries
- reg: base address and length of the registers block for the timer module.
@ -27,7 +30,7 @@ Optional Properties:
Example: R8A7779 (R-Car H1) TMU0 node
tmu0: timer@ffd80000 {
compatible = "renesas,tmu";
compatible = "renesas,tmu-r8a7779", "renesas,tmu";
reg = <0xffd80000 0x30>;
interrupts = <0 32 IRQ_TYPE_LEVEL_HIGH>,
<0 33 IRQ_TYPE_LEVEL_HIGH>,

25
arch/arm/include/asm/arch_timer.h
View File

@ -99,31 +99,6 @@ static inline void arch_timer_set_cntkctl(u32 cntkctl)
asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
}
static inline void arch_counter_set_user_access(void)
{
u32 cntkctl = arch_timer_get_cntkctl();
/* Disable user access to both physical/virtual counters/timers */
/* Also disable virtual event stream */
cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN
| ARCH_TIMER_USR_VT_ACCESS_EN
| ARCH_TIMER_VIRT_EVT_EN
| ARCH_TIMER_USR_VCT_ACCESS_EN
| ARCH_TIMER_USR_PCT_ACCESS_EN);
arch_timer_set_cntkctl(cntkctl);
}
static inline void arch_timer_evtstrm_enable(int divider)
{
u32 cntkctl = arch_timer_get_cntkctl();
cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK;
/* Set the divider and enable virtual event stream */
cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT)
| ARCH_TIMER_VIRT_EVT_EN;
arch_timer_set_cntkctl(cntkctl);
elf_hwcap |= HWCAP_EVTSTRM;
}
#endif
#endif

31
arch/arm64/include/asm/arch_timer.h
View File

@ -104,37 +104,6 @@ static inline void arch_timer_set_cntkctl(u32 cntkctl)
asm volatile("msr cntkctl_el1, %0" : : "r" (cntkctl));
}
static inline void arch_counter_set_user_access(void)
{
u32 cntkctl = arch_timer_get_cntkctl();
/* Disable user access to the timers and the physical counter */
/* Also disable virtual event stream */
cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN
| ARCH_TIMER_USR_VT_ACCESS_EN
| ARCH_TIMER_VIRT_EVT_EN
| ARCH_TIMER_USR_PCT_ACCESS_EN);
/* Enable user access to the virtual counter */
cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN;
arch_timer_set_cntkctl(cntkctl);
}
static inline void arch_timer_evtstrm_enable(int divider)
{
u32 cntkctl = arch_timer_get_cntkctl();
cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK;
/* Set the divider and enable virtual event stream */
cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT)
| ARCH_TIMER_VIRT_EVT_EN;
arch_timer_set_cntkctl(cntkctl);
elf_hwcap |= HWCAP_EVTSTRM;
#ifdef CONFIG_COMPAT
compat_elf_hwcap |= COMPAT_HWCAP_EVTSTRM;
#endif
}
static inline u64 arch_counter_get_cntvct(void)
{
u64 cval;

3
drivers/clocksource/Kconfig
View File

@ -30,6 +30,9 @@ config ARMADA_370_XP_TIMER
bool
select CLKSRC_OF
config MESON6_TIMER
bool
config ORION_TIMER
select CLKSRC_OF
select CLKSRC_MMIO

1
drivers/clocksource/Makefile
View File

@ -26,6 +26,7 @@ obj-$(CONFIG_ARCH_PRIMA2) += timer-prima2.o
obj-$(CONFIG_ARCH_U300) += timer-u300.o
obj-$(CONFIG_SUN4I_TIMER) += sun4i_timer.o
obj-$(CONFIG_SUN5I_HSTIMER) += timer-sun5i.o
obj-$(CONFIG_MESON6_TIMER) += meson6_timer.o
obj-$(CONFIG_ARCH_TEGRA) += tegra20_timer.o
obj-$(CONFIG_VT8500_TIMER) += vt8500_timer.o
obj-$(CONFIG_ARCH_NSPIRE) += zevio-timer.o

64
drivers/clocksource/arm_arch_timer.c
View File

@ -299,6 +299,21 @@ static void __arch_timer_setup(unsigned type,
clockevents_config_and_register(clk, arch_timer_rate, 0xf, 0x7fffffff);
}
static void arch_timer_evtstrm_enable(int divider)
{
u32 cntkctl = arch_timer_get_cntkctl();
cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK;
/* Set the divider and enable virtual event stream */
cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT)
| ARCH_TIMER_VIRT_EVT_EN;
arch_timer_set_cntkctl(cntkctl);
elf_hwcap |= HWCAP_EVTSTRM;
#ifdef CONFIG_COMPAT
compat_elf_hwcap |= COMPAT_HWCAP_EVTSTRM;
#endif
}
static void arch_timer_configure_evtstream(void)
{
int evt_stream_div, pos;
@ -312,6 +327,23 @@ static void arch_timer_configure_evtstream(void)
arch_timer_evtstrm_enable(min(pos, 15));
}
static void arch_counter_set_user_access(void)
{
u32 cntkctl = arch_timer_get_cntkctl();
/* Disable user access to the timers and the physical counter */
/* Also disable virtual event stream */
cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN
| ARCH_TIMER_USR_VT_ACCESS_EN
| ARCH_TIMER_VIRT_EVT_EN
| ARCH_TIMER_USR_PCT_ACCESS_EN);
/* Enable user access to the virtual counter */
cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN;
arch_timer_set_cntkctl(cntkctl);
}
static int arch_timer_setup(struct clock_event_device *clk)
{
__arch_timer_setup(ARCH_CP15_TIMER, clk);
@ -429,11 +461,19 @@ static void __init arch_counter_register(unsigned type)
u64 start_count;
/* Register the CP15 based counter if we have one */
if (type & ARCH_CP15_TIMER)
if (type & ARCH_CP15_TIMER) {
arch_timer_read_counter = arch_counter_get_cntvct;
else
} else {
arch_timer_read_counter = arch_counter_get_cntvct_mem;
/* If the clocksource name is "arch_sys_counter" the
* VDSO will attempt to read the CP15-based counter.
* Ensure this does not happen when CP15-based
* counter is not available.
*/
clocksource_counter.name = "arch_mem_counter";
}
start_count = arch_timer_read_counter();
clocksource_register_hz(&clocksource_counter, arch_timer_rate);
cyclecounter.mult = clocksource_counter.mult;
@ -616,17 +656,29 @@ static const struct of_device_id arch_timer_mem_of_match[] __initconst = {
{},
};
static bool __init
arch_timer_probed(int type, const struct of_device_id *matches)
{
struct device_node *dn;
bool probed = false;
dn = of_find_matching_node(NULL, matches);
if (dn && of_device_is_available(dn) && (arch_timers_present & type))
probed = true;
of_node_put(dn);
return probed;
}
static void __init arch_timer_common_init(void)
{
unsigned mask = ARCH_CP15_TIMER | ARCH_MEM_TIMER;
/* Wait until both nodes are probed if we have two timers */
if ((arch_timers_present & mask) != mask) {
if (of_find_matching_node(NULL, arch_timer_mem_of_match) &&
!(arch_timers_present & ARCH_MEM_TIMER))
if (!arch_timer_probed(ARCH_MEM_TIMER, arch_timer_mem_of_match))
return;
if (of_find_matching_node(NULL, arch_timer_of_match) &&
!(arch_timers_present & ARCH_CP15_TIMER))
if (!arch_timer_probed(ARCH_CP15_TIMER, arch_timer_of_match))
return;
}

15
drivers/clocksource/cadence_ttc_timer.c
View File

@ -25,7 +25,7 @@
#include <linux/sched_clock.h>
/*
* This driver configures the 2 16-bit count-up timers as follows:
* This driver configures the 2 16/32-bit count-up timers as follows:
*
* T1: Timer 1, clocksource for generic timekeeping
* T2: Timer 2, clockevent source for hrtimers
@ -321,7 +321,8 @@ static int ttc_rate_change_clocksource_cb(struct notifier_block *nb,
return NOTIFY_DONE;
}
static void __init ttc_setup_clocksource(struct clk *clk, void __iomem *base)
static void __init ttc_setup_clocksource(struct clk *clk, void __iomem *base,
u32 timer_width)
{
struct ttc_timer_clocksource *ttccs;
int err;
@ -351,7 +352,7 @@ static void __init ttc_setup_clocksource(struct clk *clk, void __iomem *base)
ttccs->cs.name = "ttc_clocksource";
ttccs->cs.rating = 200;
ttccs->cs.read = __ttc_clocksource_read;
ttccs->cs.mask = CLOCKSOURCE_MASK(16);
ttccs->cs.mask = CLOCKSOURCE_MASK(timer_width);
ttccs->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS;
/*
@ -372,7 +373,8 @@ static void __init ttc_setup_clocksource(struct clk *clk, void __iomem *base)
}
ttc_sched_clock_val_reg = base + TTC_COUNT_VAL_OFFSET;
sched_clock_register(ttc_sched_clock_read, 16, ttccs->ttc.freq / PRESCALE);
sched_clock_register(ttc_sched_clock_read, timer_width,
ttccs->ttc.freq / PRESCALE);
}
static int ttc_rate_change_clockevent_cb(struct notifier_block *nb,
@ -467,6 +469,7 @@ static void __init ttc_timer_init(struct device_node *timer)
struct clk *clk_cs, *clk_ce;
static int initialized;
int clksel;
u32 timer_width = 16;
if (initialized)
return;
@ -490,6 +493,8 @@ static void __init ttc_timer_init(struct device_node *timer)
BUG();
}
of_property_read_u32(timer, "timer-width", &timer_width);
clksel = readl_relaxed(timer_baseaddr + TTC_CLK_CNTRL_OFFSET);
clksel = !!(clksel & TTC_CLK_CNTRL_CSRC_MASK);
clk_cs = of_clk_get(timer, clksel);
@ -506,7 +511,7 @@ static void __init ttc_timer_init(struct device_node *timer)
BUG();
}
ttc_setup_clocksource(clk_cs, timer_baseaddr);
ttc_setup_clocksource(clk_cs, timer_baseaddr, timer_width);
ttc_setup_clockevent(clk_ce, timer_baseaddr + 4, irq);
pr_info("%s #0 at %p, irq=%d\n", timer->name, timer_baseaddr, irq);

167
drivers/clocksource/meson6_timer.c Normal file
View File

@ -0,0 +1,167 @@
/*
* Amlogic Meson6 SoCs timer handling.
*
* Copyright (C) 2014 Carlo Caione <carlo@caione.org>
*
* Based on code from Amlogic, Inc
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/clk.h>
#include <linux/clockchips.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqreturn.h>
#include <linux/sched_clock.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#define CED_ID 0
#define CSD_ID 4
#define TIMER_ISA_MUX 0
#define TIMER_ISA_VAL(t) (((t) + 1) << 2)
#define TIMER_INPUT_BIT(t) (2 * (t))
#define TIMER_ENABLE_BIT(t) (16 + (t))
#define TIMER_PERIODIC_BIT(t) (12 + (t))
#define TIMER_CED_INPUT_MASK (3UL << TIMER_INPUT_BIT(CED_ID))
#define TIMER_CSD_INPUT_MASK (7UL << TIMER_INPUT_BIT(CSD_ID))
#define TIMER_CED_UNIT_1US 0
#define TIMER_CSD_UNIT_1US 1
static void __iomem *timer_base;
static u64 notrace meson6_timer_sched_read(void)
{
return (u64)readl(timer_base + TIMER_ISA_VAL(CSD_ID));
}
static void meson6_clkevt_time_stop(unsigned char timer)
{
u32 val = readl(timer_base + TIMER_ISA_MUX);
writel(val & ~TIMER_ENABLE_BIT(timer), timer_base + TIMER_ISA_MUX);
}
static void meson6_clkevt_time_setup(unsigned char timer, unsigned long delay)
{
writel(delay, timer_base + TIMER_ISA_VAL(timer));
}
static void meson6_clkevt_time_start(unsigned char timer, bool periodic)
{
u32 val = readl(timer_base + TIMER_ISA_MUX);
if (periodic)
val |= TIMER_PERIODIC_BIT(timer);
else
val &= ~TIMER_PERIODIC_BIT(timer);
writel(val | TIMER_ENABLE_BIT(timer), timer_base + TIMER_ISA_MUX);
}
static void meson6_clkevt_mode(enum clock_event_mode mode,
struct clock_event_device *clk)
{
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
meson6_clkevt_time_stop(CED_ID);
meson6_clkevt_time_setup(CED_ID, USEC_PER_SEC/HZ - 1);
meson6_clkevt_time_start(CED_ID, true);
break;
case CLOCK_EVT_MODE_ONESHOT:
meson6_clkevt_time_stop(CED_ID);
meson6_clkevt_time_start(CED_ID, false);
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
default:
meson6_clkevt_time_stop(CED_ID);
break;
}
}
static int meson6_clkevt_next_event(unsigned long evt,
struct clock_event_device *unused)
{
meson6_clkevt_time_stop(CED_ID);
meson6_clkevt_time_setup(CED_ID, evt);
meson6_clkevt_time_start(CED_ID, false);
return 0;
}
static struct clock_event_device meson6_clockevent = {
.name = "meson6_tick",
.rating = 400,
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
.set_mode = meson6_clkevt_mode,
.set_next_event = meson6_clkevt_next_event,
};
static irqreturn_t meson6_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *evt = (struct clock_event_device *)dev_id;
evt->event_handler(evt);
return IRQ_HANDLED;
}
static struct irqaction meson6_timer_irq = {
.name = "meson6_timer",
.flags = IRQF_TIMER | IRQF_IRQPOLL,
.handler = meson6_timer_interrupt,
.dev_id = &meson6_clockevent,
};
static void __init meson6_timer_init(struct device_node *node)
{
u32 val;
int ret, irq;
timer_base = of_io_request_and_map(node, 0, "meson6-timer");
if (IS_ERR(timer_base))
panic("Can't map registers");
irq = irq_of_parse_and_map(node, 0);
if (irq <= 0)
panic("Can't parse IRQ");
/* Set 1us for timer E */
val = readl(timer_base + TIMER_ISA_MUX);
val &= ~TIMER_CSD_INPUT_MASK;
val |= TIMER_CSD_UNIT_1US << TIMER_INPUT_BIT(CSD_ID);
writel(val, timer_base + TIMER_ISA_MUX);
sched_clock_register(meson6_timer_sched_read, 32, USEC_PER_SEC);
clocksource_mmio_init(timer_base + TIMER_ISA_VAL(CSD_ID), node->name,
1000 * 1000, 300, 32, clocksource_mmio_readl_up);
/* Timer A base 1us */
val &= ~TIMER_CED_INPUT_MASK;
val |= TIMER_CED_UNIT_1US << TIMER_INPUT_BIT(CED_ID);
writel(val, timer_base + TIMER_ISA_MUX);
/* Stop the timer A */
meson6_clkevt_time_stop(CED_ID);
ret = setup_irq(irq, &meson6_timer_irq);
if (ret)
pr_warn("failed to setup irq %d\n", irq);
meson6_clockevent.cpumask = cpu_possible_mask;
meson6_clockevent.irq = irq;
clockevents_config_and_register(&meson6_clockevent, USEC_PER_SEC,
1, 0xfffe);
}
CLOCKSOURCE_OF_DECLARE(meson6, "amlogic,meson6-timer",
meson6_timer_init);

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

@ -63,7 +63,7 @@ static inline void sirfsoc_timer_count_disable(int idx)
/* enable count and interrupt */
static inline void sirfsoc_timer_count_enable(int idx)
{
writel_relaxed(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL + 4 * idx) | 0x7,
writel_relaxed(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL + 4 * idx) | 0x3,
sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL + 4 * idx);
}
@ -103,6 +103,9 @@ static int sirfsoc_timer_set_next_event(unsigned long delta,
{
int cpu = smp_processor_id();
/* disable timer first, then modify the related registers */
sirfsoc_timer_count_disable(cpu);
writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_0 +
4 * cpu);
writel_relaxed(delta, sirfsoc_timer_base + SIRFSOC_TIMER_MATCH_0 +

4
drivers/clocksource/vf_pit_timer.c
View File

@ -93,6 +93,10 @@ static void pit_set_mode(enum clock_event_mode mode,
case CLOCK_EVT_MODE_PERIODIC:
pit_set_next_event(cycle_per_jiffy, evt);
break;
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_UNUSED:
pit_timer_disable();
break;
default:
break;
}

3
fs/timerfd.c
View File

@ -333,8 +333,7 @@ static long timerfd_ioctl(struct file *file, unsigned int cmd, unsigned long arg
spin_lock_irq(&ctx->wqh.lock);
if (!timerfd_canceled(ctx)) {
ctx->ticks = ticks;
if (ticks)
wake_up_locked(&ctx->wqh);
wake_up_locked(&ctx->wqh);
} else
ret = -ECANCELED;
spin_unlock_irq(&ctx->wqh.lock);

8
kernel/time/tick-sched.c
View File

@ -996,6 +996,10 @@ static void tick_nohz_handler(struct clock_event_device *dev)
tick_sched_do_timer(now);
tick_sched_handle(ts, regs);
/* No need to reprogram if we are running tickless */
if (unlikely(ts->tick_stopped))
return;
while (tick_nohz_reprogram(ts, now)) {
now = ktime_get();
tick_do_update_jiffies64(now);
@ -1123,6 +1127,10 @@ static enum hrtimer_restart tick_sched_timer(struct hrtimer *timer)
if (regs)
tick_sched_handle(ts, regs);
/* No need to reprogram if we are in idle or full dynticks mode */
if (unlikely(ts->tick_stopped))
return HRTIMER_NORESTART;
hrtimer_forward(timer, now, tick_period);
return HRTIMER_RESTART;