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Merge tag 'timers-core-2021-06-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer updates from Thomas Gleixner:
 "Time and clocksource/clockevent related updates:

  Core changes:

   - Infrastructure to support per CPU "broadcast" devices for per CPU
     clockevent devices which stop in deep idle states. This allows us
     to utilize the more efficient architected timer on certain ARM SoCs
     for normal operation instead of permanentely using the slow to
     access SoC specific clockevent device.

   - Print the name of the broadcast/wakeup device in /proc/timer_list

   - Make the clocksource watchdog more robust against delays between
     reading the current active clocksource and the watchdog
     clocksource. Such delays can be caused by NMIs, SMIs and vCPU
     preemption.

     Handle this by reading the watchdog clocksource twice, i.e. before
     and after reading the current active clocksource. In case that the
     two watchdog reads shows an excessive time delta, the read sequence
     is repeated up to 3 times.

   - Improve the debug output and add a test module for the watchdog
     mechanism.

   - Reimplementation of the venerable time64_to_tm() function with a
     faster and significantly smaller version. Straight from the source,
     i.e. the author of the related research paper contributed this!

  Driver changes:

   - No new drivers, not even new device tree bindings!

   - Fixes, improvements and cleanups and all over the place"

* tag 'timers-core-2021-06-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (30 commits)
  time/kunit: Add missing MODULE_LICENSE()
  time: Improve performance of time64_to_tm()
  clockevents: Use list_move() instead of list_del()/list_add()
  clocksource: Print deviation in nanoseconds when a clocksource becomes unstable
  clocksource: Provide kernel module to test clocksource watchdog
  clocksource: Reduce clocksource-skew threshold
  clocksource: Limit number of CPUs checked for clock synchronization
  clocksource: Check per-CPU clock synchronization when marked unstable
  clocksource: Retry clock read if long delays detected
  clockevents: Add missing parameter documentation
  clocksource/drivers/timer-ti-dm: Drop unnecessary restore
  clocksource/arm_arch_timer: Improve Allwinner A64 timer workaround
  clocksource/drivers/arm_global_timer: Remove duplicated argument in arm_global_timer
  clocksource/drivers/arm_global_timer: Make symbol 'gt_clk_rate_change_nb' static
  arm: zynq: don't disable CONFIG_ARM_GLOBAL_TIMER due to CONFIG_CPU_FREQ anymore
  clocksource/drivers/arm_global_timer: Implement rate compensation whenever source clock changes
  clocksource/drivers/ingenic: Rename unreasonable array names
  clocksource/drivers/timer-ti-dm: Save and restore timer TIOCP_CFG
  clocksource/drivers/mediatek: Ack and disable interrupts on suspend
  clocksource/drivers/samsung_pwm: Constify source IO memory
  ...
This commit is contained in:
Linus Torvalds 2021-06-29 12:31:16 -07:00
commit a941a0349c
26 changed files with 990 additions and 138 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
Documentation/admin-guide/kernel-parameters.txt
View File

@ -581,6 +581,28 @@
loops can be debugged more effectively on production
systems.
clocksource.max_cswd_read_retries= [KNL]
Number of clocksource_watchdog() retries due to
external delays before the clock will be marked
unstable. Defaults to three retries, that is,
four attempts to read the clock under test.
clocksource.verify_n_cpus= [KNL]
Limit the number of CPUs checked for clocksources
marked with CLOCK_SOURCE_VERIFY_PERCPU that
are marked unstable due to excessive skew.
A negative value says to check all CPUs, while
zero says not to check any. Values larger than
nr_cpu_ids are silently truncated to nr_cpu_ids.
The actual CPUs are chosen randomly, with
no replacement if the same CPU is chosen twice.
clocksource-wdtest.holdoff= [KNL]
Set the time in seconds that the clocksource
watchdog test waits before commencing its tests.
Defaults to zero when built as a module and to
10 seconds when built into the kernel.
clearcpuid=BITNUM[,BITNUM...] [X86]
Disable CPUID feature X for the kernel. See
arch/x86/include/asm/cpufeatures.h for the valid bit

2
arch/arm/mach-zynq/Kconfig
View File

@ -6,7 +6,7 @@ config ARCH_ZYNQ
select ARCH_SUPPORTS_BIG_ENDIAN
select ARM_AMBA
select ARM_GIC
select ARM_GLOBAL_TIMER if !CPU_FREQ
select ARM_GLOBAL_TIMER
select CADENCE_TTC_TIMER
select HAVE_ARM_SCU if SMP
select HAVE_ARM_TWD if SMP

4
arch/x86/kernel/tsc.c
View File

@ -1128,6 +1128,7 @@ static int tsc_cs_enable(struct clocksource *cs)
static struct clocksource clocksource_tsc_early = {
.name = "tsc-early",
.rating = 299,
.uncertainty_margin = 32 * NSEC_PER_MSEC,
.read = read_tsc,
.mask = CLOCKSOURCE_MASK(64),
.flags = CLOCK_SOURCE_IS_CONTINUOUS |
@ -1152,7 +1153,8 @@ static struct clocksource clocksource_tsc = {
.mask = CLOCKSOURCE_MASK(64),
.flags = CLOCK_SOURCE_IS_CONTINUOUS |
CLOCK_SOURCE_VALID_FOR_HRES |
CLOCK_SOURCE_MUST_VERIFY,
CLOCK_SOURCE_MUST_VERIFY |
CLOCK_SOURCE_VERIFY_PERCPU,
.vdso_clock_mode = VDSO_CLOCKMODE_TSC,
.enable = tsc_cs_enable,
.resume = tsc_resume,

14
drivers/clocksource/Kconfig
View File

@ -358,6 +358,20 @@ config ARM_GLOBAL_TIMER
help
This option enables support for the ARM global timer unit.
config ARM_GT_INITIAL_PRESCALER_VAL
int "ARM global timer initial prescaler value"
default 2 if ARCH_ZYNQ
default 1
depends on ARM_GLOBAL_TIMER
help
When the ARM global timer initializes, its current rate is declared
to the kernel and maintained forever. Should it's parent clock
change, the driver tries to fix the timer's internal prescaler.
On some machs (i.e. Zynq) the initial prescaler value thus poses
bounds about how much the parent clock is allowed to decrease or
increase wrt the initial clock value.
This affects CPU_FREQ max delta from the initial frequency.
config ARM_TIMER_SP804
bool "Support for Dual Timer SP804 module" if COMPILE_TEST
depends on GENERIC_SCHED_CLOCK && CLKDEV_LOOKUP

3
drivers/clocksource/arm_arch_timer.c
View File

@ -64,7 +64,6 @@ struct arch_timer {
#define to_arch_timer(e) container_of(e, struct arch_timer, evt)
static u32 arch_timer_rate __ro_after_init;
u32 arch_timer_rate1 __ro_after_init;
static int arch_timer_ppi[ARCH_TIMER_MAX_TIMER_PPI] __ro_after_init;
static const char *arch_timer_ppi_names[ARCH_TIMER_MAX_TIMER_PPI] = {
@ -365,7 +364,7 @@ static u64 notrace arm64_858921_read_cntvct_el0(void)
do { \
_val = read_sysreg(reg); \
_retries--; \
} while (((_val + 1) & GENMASK(9, 0)) <= 1 && _retries); \
} while (((_val + 1) & GENMASK(8, 0)) <= 1 && _retries); \
\
WARN_ON_ONCE(!_retries); \
_val; \

122
drivers/clocksource/arm_global_timer.c
View File

@ -31,6 +31,10 @@
#define GT_CONTROL_COMP_ENABLE BIT(1) /* banked */
#define GT_CONTROL_IRQ_ENABLE BIT(2) /* banked */
#define GT_CONTROL_AUTO_INC BIT(3) /* banked */
#define GT_CONTROL_PRESCALER_SHIFT 8
#define GT_CONTROL_PRESCALER_MAX 0xF
#define GT_CONTROL_PRESCALER_MASK (GT_CONTROL_PRESCALER_MAX << \
GT_CONTROL_PRESCALER_SHIFT)
#define GT_INT_STATUS 0x0c
#define GT_INT_STATUS_EVENT_FLAG BIT(0)
@ -39,6 +43,7 @@
#define GT_COMP1 0x14
#define GT_AUTO_INC 0x18
#define MAX_F_ERR 50
/*
* We are expecting to be clocked by the ARM peripheral clock.
*
@ -46,7 +51,8 @@
* the units for all operations.
*/
static void __iomem *gt_base;
static unsigned long gt_clk_rate;
static struct notifier_block gt_clk_rate_change_nb;
static u32 gt_psv_new, gt_psv_bck, gt_target_rate;
static int gt_ppi;
static struct clock_event_device __percpu *gt_evt;
@ -96,7 +102,10 @@ static void gt_compare_set(unsigned long delta, int periodic)
unsigned long ctrl;
counter += delta;
ctrl = GT_CONTROL_TIMER_ENABLE;
ctrl = readl(gt_base + GT_CONTROL);
ctrl &= ~(GT_CONTROL_COMP_ENABLE | GT_CONTROL_IRQ_ENABLE |
GT_CONTROL_AUTO_INC);
ctrl |= GT_CONTROL_TIMER_ENABLE;
writel_relaxed(ctrl, gt_base + GT_CONTROL);
writel_relaxed(lower_32_bits(counter), gt_base + GT_COMP0);
writel_relaxed(upper_32_bits(counter), gt_base + GT_COMP1);
@ -123,7 +132,7 @@ static int gt_clockevent_shutdown(struct clock_event_device *evt)
static int gt_clockevent_set_periodic(struct clock_event_device *evt)
{
gt_compare_set(DIV_ROUND_CLOSEST(gt_clk_rate, HZ), 1);
gt_compare_set(DIV_ROUND_CLOSEST(gt_target_rate, HZ), 1);
return 0;
}
@ -177,7 +186,7 @@ static int gt_starting_cpu(unsigned int cpu)
clk->cpumask = cpumask_of(cpu);
clk->rating = 300;
clk->irq = gt_ppi;
clockevents_config_and_register(clk, gt_clk_rate,
clockevents_config_and_register(clk, gt_target_rate,
1, 0xffffffff);
enable_percpu_irq(clk->irq, IRQ_TYPE_NONE);
return 0;
@ -232,9 +241,28 @@ static struct delay_timer gt_delay_timer = {
.read_current_timer = gt_read_long,
};
static void gt_write_presc(u32 psv)
{
u32 reg;
reg = readl(gt_base + GT_CONTROL);
reg &= ~GT_CONTROL_PRESCALER_MASK;
reg |= psv << GT_CONTROL_PRESCALER_SHIFT;
writel(reg, gt_base + GT_CONTROL);
}
static u32 gt_read_presc(void)
{
u32 reg;
reg = readl(gt_base + GT_CONTROL);
reg &= GT_CONTROL_PRESCALER_MASK;
return reg >> GT_CONTROL_PRESCALER_SHIFT;
}
static void __init gt_delay_timer_init(void)
{
gt_delay_timer.freq = gt_clk_rate;
gt_delay_timer.freq = gt_target_rate;
register_current_timer_delay(&gt_delay_timer);
}
@ -243,18 +271,81 @@ static int __init gt_clocksource_init(void)
writel(0, gt_base + GT_CONTROL);
writel(0, gt_base + GT_COUNTER0);
writel(0, gt_base + GT_COUNTER1);
/* enables timer on all the cores */
writel(GT_CONTROL_TIMER_ENABLE, gt_base + GT_CONTROL);
/* set prescaler and enable timer on all the cores */
writel(((CONFIG_ARM_GT_INITIAL_PRESCALER_VAL - 1) <<
GT_CONTROL_PRESCALER_SHIFT)
| GT_CONTROL_TIMER_ENABLE, gt_base + GT_CONTROL);
#ifdef CONFIG_CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
sched_clock_register(gt_sched_clock_read, 64, gt_clk_rate);
sched_clock_register(gt_sched_clock_read, 64, gt_target_rate);
#endif
return clocksource_register_hz(&gt_clocksource, gt_clk_rate);
return clocksource_register_hz(&gt_clocksource, gt_target_rate);
}
static int gt_clk_rate_change_cb(struct notifier_block *nb,
unsigned long event, void *data)
{
struct clk_notifier_data *ndata = data;
switch (event) {
case PRE_RATE_CHANGE:
{
int psv;
psv = DIV_ROUND_CLOSEST(ndata->new_rate,
gt_target_rate);
if (abs(gt_target_rate - (ndata->new_rate / psv)) > MAX_F_ERR)
return NOTIFY_BAD;
psv--;
/* prescaler within legal range? */
if (psv < 0 || psv > GT_CONTROL_PRESCALER_MAX)
return NOTIFY_BAD;
/*
* store timer clock ctrl register so we can restore it in case
* of an abort.
*/
gt_psv_bck = gt_read_presc();
gt_psv_new = psv;
/* scale down: adjust divider in post-change notification */
if (ndata->new_rate < ndata->old_rate)
return NOTIFY_DONE;
/* scale up: adjust divider now - before frequency change */
gt_write_presc(psv);
break;
}
case POST_RATE_CHANGE:
/* scale up: pre-change notification did the adjustment */
if (ndata->new_rate > ndata->old_rate)
return NOTIFY_OK;
/* scale down: adjust divider now - after frequency change */
gt_write_presc(gt_psv_new);
break;
case ABORT_RATE_CHANGE:
/* we have to undo the adjustment in case we scale up */
if (ndata->new_rate < ndata->old_rate)
return NOTIFY_OK;
/* restore original register value */
gt_write_presc(gt_psv_bck);
break;
default:
return NOTIFY_DONE;
}
return NOTIFY_DONE;
}
static int __init global_timer_of_register(struct device_node *np)
{
struct clk *gt_clk;
static unsigned long gt_clk_rate;
int err = 0;
/*
@ -292,11 +383,20 @@ static int __init global_timer_of_register(struct device_node *np)
}
gt_clk_rate = clk_get_rate(gt_clk);
gt_target_rate = gt_clk_rate / CONFIG_ARM_GT_INITIAL_PRESCALER_VAL;
gt_clk_rate_change_nb.notifier_call =
gt_clk_rate_change_cb;
err = clk_notifier_register(gt_clk, &gt_clk_rate_change_nb);
if (err) {
pr_warn("Unable to register clock notifier\n");
goto out_clk;
}
gt_evt = alloc_percpu(struct clock_event_device);
if (!gt_evt) {
pr_warn("global-timer: can't allocate memory\n");
err = -ENOMEM;
goto out_clk;
goto out_clk_nb;
}
err = request_percpu_irq(gt_ppi, gt_clockevent_interrupt,
@ -326,6 +426,8 @@ out_irq:
free_percpu_irq(gt_ppi, gt_evt);
out_free:
free_percpu(gt_evt);
out_clk_nb:
clk_notifier_unregister(gt_clk, &gt_clk_rate_change_nb);
out_clk:
clk_disable_unprepare(gt_clk);
out_unmap:

10
drivers/clocksource/ingenic-sysost.c
View File

@ -186,7 +186,7 @@ static const struct clk_ops ingenic_ost_global_timer_ops = {
static const char * const ingenic_ost_clk_parents[] = { "ext" };
static const struct ingenic_ost_clk_info ingenic_ost_clk_info[] = {
static const struct ingenic_ost_clk_info x1000_ost_clk_info[] = {
[OST_CLK_PERCPU_TIMER] = {
.init_data = {
.name = "percpu timer",
@ -414,14 +414,14 @@ static const struct ingenic_soc_info x1000_soc_info = {
.num_channels = 2,
};
static const struct of_device_id __maybe_unused ingenic_ost_of_match[] __initconst = {
{ .compatible = "ingenic,x1000-ost", .data = &x1000_soc_info, },
static const struct of_device_id __maybe_unused ingenic_ost_of_matches[] __initconst = {
{ .compatible = "ingenic,x1000-ost", .data = &x1000_soc_info },
{ /* sentinel */ }
};
static int __init ingenic_ost_probe(struct device_node *np)
{
const struct of_device_id *id = of_match_node(ingenic_ost_of_match, np);
const struct of_device_id *id = of_match_node(ingenic_ost_of_matches, np);
struct ingenic_ost *ost;
unsigned int i;
int ret;
@ -462,7 +462,7 @@ static int __init ingenic_ost_probe(struct device_node *np)
ost->clocks->num = ost->soc_info->num_channels;
for (i = 0; i < ost->clocks->num; i++) {
ret = ingenic_ost_register_clock(ost, i, &ingenic_ost_clk_info[i], ost->clocks);
ret = ingenic_ost_register_clock(ost, i, &x1000_ost_clk_info[i], ost->clocks);
if (ret) {
pr_crit("%s: Cannot register clock %d\n", __func__, i);
goto err_unregister_ost_clocks;

41
drivers/clocksource/samsung_pwm_timer.c
View File

@ -4,7 +4,7 @@
* http://www.samsung.com/
*
* samsung - Common hr-timer support (s3c and s5p)
*/
*/
#include <linux/interrupt.h>
#include <linux/irq.h>
@ -22,7 +22,6 @@
#include <clocksource/samsung_pwm.h>
/*
* Clocksource driver
*/
@ -38,8 +37,8 @@
#define TCFG0_PRESCALER_MASK 0xff
#define TCFG0_PRESCALER1_SHIFT 8
#define TCFG1_SHIFT(x) ((x) * 4)
#define TCFG1_MUX_MASK 0xf
#define TCFG1_SHIFT(x) ((x) * 4)
#define TCFG1_MUX_MASK 0xf
/*
* Each channel occupies 4 bits in TCON register, but there is a gap of 4
@ -62,7 +61,7 @@ EXPORT_SYMBOL(samsung_pwm_lock);
struct samsung_pwm_clocksource {
void __iomem *base;
void __iomem *source_reg;
const void __iomem *source_reg;
unsigned int irq[SAMSUNG_PWM_NUM];
struct samsung_pwm_variant variant;
@ -183,7 +182,7 @@ static void samsung_time_start(unsigned int channel, bool periodic)
}
static int samsung_set_next_event(unsigned long cycles,
struct clock_event_device *evt)
struct clock_event_device *evt)
{
/*
* This check is needed to account for internal rounding
@ -225,6 +224,7 @@ static void samsung_clockevent_resume(struct clock_event_device *cev)
if (pwm.variant.has_tint_cstat) {
u32 mask = (1 << pwm.event_id);
writel(mask | (mask << 5), pwm.base + REG_TINT_CSTAT);
}
}
@ -248,6 +248,7 @@ static irqreturn_t samsung_clock_event_isr(int irq, void *dev_id)
if (pwm.variant.has_tint_cstat) {
u32 mask = (1 << pwm.event_id);
writel(mask | (mask << 5), pwm.base + REG_TINT_CSTAT);
}
@ -272,7 +273,7 @@ static void __init samsung_clockevent_init(void)
time_event_device.cpumask = cpumask_of(0);
clockevents_config_and_register(&time_event_device,
clock_rate, 1, pwm.tcnt_max);
clock_rate, 1, pwm.tcnt_max);
irq_number = pwm.irq[pwm.event_id];
if (request_irq(irq_number, samsung_clock_event_isr,
@ -282,6 +283,7 @@ static void __init samsung_clockevent_init(void)
if (pwm.variant.has_tint_cstat) {
u32 mask = (1 << pwm.event_id);
writel(mask | (mask << 5), pwm.base + REG_TINT_CSTAT);
}
}
@ -347,7 +349,7 @@ static int __init samsung_clocksource_init(void)
pwm.source_reg = pwm.base + pwm.source_id * 0x0c + 0x14;
sched_clock_register(samsung_read_sched_clock,
pwm.variant.bits, clock_rate);
pwm.variant.bits, clock_rate);
samsung_clocksource.mask = CLOCKSOURCE_MASK(pwm.variant.bits);
return clocksource_register_hz(&samsung_clocksource, clock_rate);
@ -398,7 +400,8 @@ static int __init _samsung_pwm_clocksource_init(void)
}
void __init samsung_pwm_clocksource_init(void __iomem *base,
unsigned int *irqs, struct samsung_pwm_variant *variant)
unsigned int *irqs,
const struct samsung_pwm_variant *variant)
{
pwm.base = base;
memcpy(&pwm.variant, variant, sizeof(pwm.variant));
@ -418,7 +421,7 @@ static int __init samsung_pwm_alloc(struct device_node *np,
struct property *prop;
const __be32 *cur;
u32 val;
int i;
int i, ret;
memcpy(&pwm.variant, variant, sizeof(pwm.variant));
for (i = 0; i < SAMSUNG_PWM_NUM; ++i)
@ -441,10 +444,24 @@ static int __init samsung_pwm_alloc(struct device_node *np,
pwm.timerclk = of_clk_get_by_name(np, "timers");
if (IS_ERR(pwm.timerclk)) {
pr_crit("failed to get timers clock for timer\n");
return PTR_ERR(pwm.timerclk);
ret = PTR_ERR(pwm.timerclk);
goto err_clk;
}
return _samsung_pwm_clocksource_init();
ret = _samsung_pwm_clocksource_init();
if (ret)
goto err_clocksource;
return 0;
err_clocksource:
clk_put(pwm.timerclk);
pwm.timerclk = NULL;
err_clk:
iounmap(pwm.base);
pwm.base = NULL;
return ret;
}
static const struct samsung_pwm_variant s3c24xx_variant = {

24
drivers/clocksource/timer-mediatek.c
View File

@ -241,6 +241,28 @@ static void mtk_gpt_enable_irq(struct timer_of *to, u8 timer)
timer_of_base(to) + GPT_IRQ_EN_REG);
}
static void mtk_gpt_resume(struct clock_event_device *clk)
{
struct timer_of *to = to_timer_of(clk);
mtk_gpt_enable_irq(to, TIMER_CLK_EVT);
}
static void mtk_gpt_suspend(struct clock_event_device *clk)
{
struct timer_of *to = to_timer_of(clk);
/* Disable all interrupts */
writel(0x0, timer_of_base(to) + GPT_IRQ_EN_REG);
/*
* This is called with interrupts disabled,
* so we need to ack any interrupt that is pending
* or for example ATF will prevent a suspend from completing.
*/
writel(0x3f, timer_of_base(to) + GPT_IRQ_ACK_REG);
}
static struct timer_of to = {
.flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,
@ -286,6 +308,8 @@ static int __init mtk_gpt_init(struct device_node *node)
to.clkevt.set_state_oneshot = mtk_gpt_clkevt_shutdown;
to.clkevt.tick_resume = mtk_gpt_clkevt_shutdown;
to.clkevt.set_next_event = mtk_gpt_clkevt_next_event;
to.clkevt.suspend = mtk_gpt_suspend;
to.clkevt.resume = mtk_gpt_resume;
to.of_irq.handler = mtk_gpt_interrupt;
ret = timer_of_init(node, &to);

9
drivers/clocksource/timer-ti-dm.c
View File

@ -78,6 +78,9 @@ static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
static void omap_timer_restore_context(struct omap_dm_timer *timer)
{
__omap_dm_timer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET,
timer->context.ocp_cfg, 0);
omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG,
timer->context.twer);
omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG,
@ -95,6 +98,9 @@ static void omap_timer_restore_context(struct omap_dm_timer *timer)
static void omap_timer_save_context(struct omap_dm_timer *timer)
{
timer->context.ocp_cfg =
__omap_dm_timer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET, 0);
timer->context.tclr =
omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
timer->context.twer =
@ -122,7 +128,8 @@ static int omap_timer_context_notifier(struct notifier_block *nb,
break;
omap_timer_save_context(timer);
break;
case CPU_CLUSTER_PM_ENTER_FAILED:
case CPU_CLUSTER_PM_ENTER_FAILED: /* No need to restore context */
break;
case CPU_CLUSTER_PM_EXIT:
if ((timer->capability & OMAP_TIMER_ALWON) ||
!atomic_read(&timer->enabled))

3
include/clocksource/samsung_pwm.h
View File

@ -27,6 +27,7 @@ struct samsung_pwm_variant {
};
void samsung_pwm_clocksource_init(void __iomem *base,
unsigned int *irqs, struct samsung_pwm_variant *variant);
unsigned int *irqs,
const struct samsung_pwm_variant *variant);
#endif /* __CLOCKSOURCE_SAMSUNG_PWM_H */

1
include/clocksource/timer-ti-dm.h
View File

@ -74,6 +74,7 @@
#define OMAP_TIMER_ERRATA_I103_I767 0x80000000
struct timer_regs {
u32 ocp_cfg;
u32 tidr;
u32 tier;
u32 twer;

8
include/linux/clocksource.h
View File

@ -43,6 +43,8 @@ struct module;
* @shift: Cycle to nanosecond divisor (power of two)
* @max_idle_ns: Maximum idle time permitted by the clocksource (nsecs)
* @maxadj: Maximum adjustment value to mult (~11%)
* @uncertainty_margin: Maximum uncertainty in nanoseconds per half second.
* Zero says to use default WATCHDOG_THRESHOLD.
* @archdata: Optional arch-specific data
* @max_cycles: Maximum safe cycle value which won't overflow on
* multiplication
@ -98,6 +100,7 @@ struct clocksource {
u32 shift;
u64 max_idle_ns;
u32 maxadj;
u32 uncertainty_margin;
#ifdef CONFIG_ARCH_CLOCKSOURCE_DATA
struct arch_clocksource_data archdata;
#endif
@ -137,7 +140,7 @@ struct clocksource {
#define CLOCK_SOURCE_UNSTABLE 0x40
#define CLOCK_SOURCE_SUSPEND_NONSTOP 0x80
#define CLOCK_SOURCE_RESELECT 0x100
#define CLOCK_SOURCE_VERIFY_PERCPU 0x200
/* simplify initialization of mask field */
#define CLOCKSOURCE_MASK(bits) GENMASK_ULL((bits) - 1, 0)
@ -288,4 +291,7 @@ static inline void timer_probe(void) {}
#define TIMER_ACPI_DECLARE(name, table_id, fn) \
ACPI_DECLARE_PROBE_ENTRY(timer, name, table_id, 0, NULL, 0, fn)
extern ulong max_cswd_read_retries;
void clocksource_verify_percpu(struct clocksource *cs);
#endif /* _LINUX_CLOCKSOURCE_H */

9
kernel/time/Kconfig
View File

@ -64,6 +64,15 @@ config LEGACY_TIMER_TICK
lack support for the generic clockevent framework.
New platforms should use generic clockevents instead.
config TIME_KUNIT_TEST
tristate "KUnit test for kernel/time functions" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
help
Enable this option to test RTC library functions.
If unsure, say N.
if GENERIC_CLOCKEVENTS
menu "Timers subsystem"

2
kernel/time/Makefile
View File

@ -21,3 +21,5 @@ obj-$(CONFIG_HAVE_GENERIC_VDSO) += vsyscall.o
obj-$(CONFIG_DEBUG_FS) += timekeeping_debug.o
obj-$(CONFIG_TEST_UDELAY) += test_udelay.o
obj-$(CONFIG_TIME_NS) += namespace.o
obj-$(CONFIG_TEST_CLOCKSOURCE_WATCHDOG) += clocksource-wdtest.o
obj-$(CONFIG_TIME_KUNIT_TEST) += time_test.o

23
kernel/time/clockevents.c
View File

@ -347,8 +347,7 @@ static void clockevents_notify_released(void)
while (!list_empty(&clockevents_released)) {
dev = list_entry(clockevents_released.next,
struct clock_event_device, list);
list_del(&dev->list);
list_add(&dev->list, &clockevent_devices);
list_move(&dev->list, &clockevent_devices);
tick_check_new_device(dev);
}
}
@ -576,8 +575,7 @@ void clockevents_exchange_device(struct clock_event_device *old,
if (old) {
module_put(old->owner);
clockevents_switch_state(old, CLOCK_EVT_STATE_DETACHED);
list_del(&old->list);
list_add(&old->list, &clockevents_released);
list_move(&old->list, &clockevents_released);
}
if (new) {
@ -629,6 +627,7 @@ void tick_offline_cpu(unsigned int cpu)
/**
* tick_cleanup_dead_cpu - Cleanup the tick and clockevents of a dead cpu
* @cpu: The dead CPU
*/
void tick_cleanup_dead_cpu(int cpu)
{
@ -668,9 +667,9 @@ static struct bus_type clockevents_subsys = {
static DEFINE_PER_CPU(struct device, tick_percpu_dev);
static struct tick_device *tick_get_tick_dev(struct device *dev);
static ssize_t sysfs_show_current_tick_dev(struct device *dev,
struct device_attribute *attr,
char *buf)
static ssize_t current_device_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct tick_device *td;
ssize_t count = 0;
@ -682,12 +681,12 @@ static ssize_t sysfs_show_current_tick_dev(struct device *dev,
raw_spin_unlock_irq(&clockevents_lock);
return count;
}
static DEVICE_ATTR(current_device, 0444, sysfs_show_current_tick_dev, NULL);
static DEVICE_ATTR_RO(current_device);
/* We don't support the abomination of removable broadcast devices */
static ssize_t sysfs_unbind_tick_dev(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
static ssize_t unbind_device_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
char name[CS_NAME_LEN];
ssize_t ret = sysfs_get_uname(buf, name, count);
@ -714,7 +713,7 @@ static ssize_t sysfs_unbind_tick_dev(struct device *dev,
mutex_unlock(&clockevents_mutex);
return ret ? ret : count;
}
static DEVICE_ATTR(unbind_device, 0200, NULL, sysfs_unbind_tick_dev);
static DEVICE_ATTR_WO(unbind_device);
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
static struct device tick_bc_dev = {

202
kernel/time/clocksource-wdtest.c Normal file
View File

@ -0,0 +1,202 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Unit test for the clocksource watchdog.
*
* Copyright (C) 2021 Facebook, Inc.
*
* Author: Paul E. McKenney <paulmck@kernel.org>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/device.h>
#include <linux/clocksource.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/sched.h> /* for spin_unlock_irq() using preempt_count() m68k */
#include <linux/tick.h>
#include <linux/kthread.h>
#include <linux/delay.h>
#include <linux/prandom.h>
#include <linux/cpu.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Paul E. McKenney <paulmck@kernel.org>");
static int holdoff = IS_BUILTIN(CONFIG_TEST_CLOCKSOURCE_WATCHDOG) ? 10 : 0;
module_param(holdoff, int, 0444);
MODULE_PARM_DESC(holdoff, "Time to wait to start test (s).");
/* Watchdog kthread's task_struct pointer for debug purposes. */
static struct task_struct *wdtest_task;
static u64 wdtest_jiffies_read(struct clocksource *cs)
{
return (u64)jiffies;
}
/* Assume HZ > 100. */
#define JIFFIES_SHIFT 8
static struct clocksource clocksource_wdtest_jiffies = {
.name = "wdtest-jiffies",
.rating = 1, /* lowest valid rating*/
.uncertainty_margin = TICK_NSEC,
.read = wdtest_jiffies_read,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_MUST_VERIFY,
.mult = TICK_NSEC << JIFFIES_SHIFT, /* details above */
.shift = JIFFIES_SHIFT,
.max_cycles = 10,
};
static int wdtest_ktime_read_ndelays;
static bool wdtest_ktime_read_fuzz;
static u64 wdtest_ktime_read(struct clocksource *cs)
{
int wkrn = READ_ONCE(wdtest_ktime_read_ndelays);
static int sign = 1;
u64 ret;
if (wkrn) {
udelay(cs->uncertainty_margin / 250);
WRITE_ONCE(wdtest_ktime_read_ndelays, wkrn - 1);
}
ret = ktime_get_real_fast_ns();
if (READ_ONCE(wdtest_ktime_read_fuzz)) {
sign = -sign;
ret = ret + sign * 100 * NSEC_PER_MSEC;
}
return ret;
}
static void wdtest_ktime_cs_mark_unstable(struct clocksource *cs)
{
pr_info("--- Marking %s unstable due to clocksource watchdog.\n", cs->name);
}
#define KTIME_FLAGS (CLOCK_SOURCE_IS_CONTINUOUS | \
CLOCK_SOURCE_VALID_FOR_HRES | \
CLOCK_SOURCE_MUST_VERIFY | \
CLOCK_SOURCE_VERIFY_PERCPU)
static struct clocksource clocksource_wdtest_ktime = {
.name = "wdtest-ktime",
.rating = 300,
.read = wdtest_ktime_read,
.mask = CLOCKSOURCE_MASK(64),
.flags = KTIME_FLAGS,
.mark_unstable = wdtest_ktime_cs_mark_unstable,
.list = LIST_HEAD_INIT(clocksource_wdtest_ktime.list),
};
/* Reset the clocksource if needed. */
static void wdtest_ktime_clocksource_reset(void)
{
if (clocksource_wdtest_ktime.flags & CLOCK_SOURCE_UNSTABLE) {
clocksource_unregister(&clocksource_wdtest_ktime);
clocksource_wdtest_ktime.flags = KTIME_FLAGS;
schedule_timeout_uninterruptible(HZ / 10);
clocksource_register_khz(&clocksource_wdtest_ktime, 1000 * 1000);
}
}
/* Run the specified series of watchdog tests. */
static int wdtest_func(void *arg)
{
unsigned long j1, j2;
char *s;
int i;
schedule_timeout_uninterruptible(holdoff * HZ);
/*
* Verify that jiffies-like clocksources get the manually
* specified uncertainty margin.
*/
pr_info("--- Verify jiffies-like uncertainty margin.\n");
__clocksource_register(&clocksource_wdtest_jiffies);
WARN_ON_ONCE(clocksource_wdtest_jiffies.uncertainty_margin != TICK_NSEC);
j1 = clocksource_wdtest_jiffies.read(&clocksource_wdtest_jiffies);
schedule_timeout_uninterruptible(HZ);
j2 = clocksource_wdtest_jiffies.read(&clocksource_wdtest_jiffies);
WARN_ON_ONCE(j1 == j2);
clocksource_unregister(&clocksource_wdtest_jiffies);
/*
* Verify that tsc-like clocksources are assigned a reasonable
* uncertainty margin.
*/
pr_info("--- Verify tsc-like uncertainty margin.\n");
clocksource_register_khz(&clocksource_wdtest_ktime, 1000 * 1000);
WARN_ON_ONCE(clocksource_wdtest_ktime.uncertainty_margin < NSEC_PER_USEC);
j1 = clocksource_wdtest_ktime.read(&clocksource_wdtest_ktime);
udelay(1);
j2 = clocksource_wdtest_ktime.read(&clocksource_wdtest_ktime);
pr_info("--- tsc-like times: %lu - %lu = %lu.\n", j2, j1, j2 - j1);
WARN_ON_ONCE(time_before(j2, j1 + NSEC_PER_USEC));
/* Verify tsc-like stability with various numbers of errors injected. */
for (i = 0; i <= max_cswd_read_retries + 1; i++) {
if (i <= 1 && i < max_cswd_read_retries)
s = "";
else if (i <= max_cswd_read_retries)
s = ", expect message";
else
s = ", expect clock skew";
pr_info("--- Watchdog with %dx error injection, %lu retries%s.\n", i, max_cswd_read_retries, s);
WRITE_ONCE(wdtest_ktime_read_ndelays, i);
schedule_timeout_uninterruptible(2 * HZ);
WARN_ON_ONCE(READ_ONCE(wdtest_ktime_read_ndelays));
WARN_ON_ONCE((i <= max_cswd_read_retries) !=
!(clocksource_wdtest_ktime.flags & CLOCK_SOURCE_UNSTABLE));
wdtest_ktime_clocksource_reset();
}
/* Verify tsc-like stability with clock-value-fuzz error injection. */
pr_info("--- Watchdog clock-value-fuzz error injection, expect clock skew and per-CPU mismatches.\n");
WRITE_ONCE(wdtest_ktime_read_fuzz, true);
schedule_timeout_uninterruptible(2 * HZ);
WARN_ON_ONCE(!(clocksource_wdtest_ktime.flags & CLOCK_SOURCE_UNSTABLE));
clocksource_verify_percpu(&clocksource_wdtest_ktime);
WRITE_ONCE(wdtest_ktime_read_fuzz, false);
clocksource_unregister(&clocksource_wdtest_ktime);
pr_info("--- Done with test.\n");
return 0;
}
static void wdtest_print_module_parms(void)
{
pr_alert("--- holdoff=%d\n", holdoff);
}
/* Cleanup function. */
static void clocksource_wdtest_cleanup(void)
{
}
static int __init clocksource_wdtest_init(void)
{
int ret = 0;
wdtest_print_module_parms();
/* Create watchdog-test task. */
wdtest_task = kthread_run(wdtest_func, NULL, "wdtest");
if (IS_ERR(wdtest_task)) {
ret = PTR_ERR(wdtest_task);
pr_warn("%s: Failed to create wdtest kthread.\n", __func__);
wdtest_task = NULL;
return ret;
}
return 0;
}
module_init(clocksource_wdtest_init);
module_exit(clocksource_wdtest_cleanup);

227
kernel/time/clocksource.c
View File

@ -14,6 +14,8 @@
#include <linux/sched.h> /* for spin_unlock_irq() using preempt_count() m68k */
#include <linux/tick.h>
#include <linux/kthread.h>
#include <linux/prandom.h>
#include <linux/cpu.h>
#include "tick-internal.h"
#include "timekeeping_internal.h"
@ -93,6 +95,20 @@ static char override_name[CS_NAME_LEN];
static int finished_booting;
static u64 suspend_start;
/*
* Threshold: 0.0312s, when doubled: 0.0625s.
* Also a default for cs->uncertainty_margin when registering clocks.
*/
#define WATCHDOG_THRESHOLD (NSEC_PER_SEC >> 5)
/*
* Maximum permissible delay between two readouts of the watchdog
* clocksource surrounding a read of the clocksource being validated.
* This delay could be due to SMIs, NMIs, or to VCPU preemptions. Used as
* a lower bound for cs->uncertainty_margin values when registering clocks.
*/
#define WATCHDOG_MAX_SKEW (50 * NSEC_PER_USEC)
#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
static void clocksource_watchdog_work(struct work_struct *work);
static void clocksource_select(void);
@ -119,10 +135,9 @@ static int clocksource_watchdog_kthread(void *data);
static void __clocksource_change_rating(struct clocksource *cs, int rating);
/*
* Interval: 0.5sec Threshold: 0.0625s
* Interval: 0.5sec.
*/
#define WATCHDOG_INTERVAL (HZ >> 1)
#define WATCHDOG_THRESHOLD (NSEC_PER_SEC >> 4)
static void clocksource_watchdog_work(struct work_struct *work)
{
@ -184,12 +199,164 @@ void clocksource_mark_unstable(struct clocksource *cs)
spin_unlock_irqrestore(&watchdog_lock, flags);
}
ulong max_cswd_read_retries = 3;
module_param(max_cswd_read_retries, ulong, 0644);
EXPORT_SYMBOL_GPL(max_cswd_read_retries);
static int verify_n_cpus = 8;
module_param(verify_n_cpus, int, 0644);
static bool cs_watchdog_read(struct clocksource *cs, u64 *csnow, u64 *wdnow)
{
unsigned int nretries;
u64 wd_end, wd_delta;
int64_t wd_delay;
for (nretries = 0; nretries <= max_cswd_read_retries; nretries++) {
local_irq_disable();
*wdnow = watchdog->read(watchdog);
*csnow = cs->read(cs);
wd_end = watchdog->read(watchdog);
local_irq_enable();
wd_delta = clocksource_delta(wd_end, *wdnow, watchdog->mask);
wd_delay = clocksource_cyc2ns(wd_delta, watchdog->mult,
watchdog->shift);
if (wd_delay <= WATCHDOG_MAX_SKEW) {
if (nretries > 1 || nretries >= max_cswd_read_retries) {
pr_warn("timekeeping watchdog on CPU%d: %s retried %d times before success\n",
smp_processor_id(), watchdog->name, nretries);
}
return true;
}
}
pr_warn("timekeeping watchdog on CPU%d: %s read-back delay of %lldns, attempt %d, marking unstable\n",
smp_processor_id(), watchdog->name, wd_delay, nretries);
return false;
}
static u64 csnow_mid;
static cpumask_t cpus_ahead;
static cpumask_t cpus_behind;
static cpumask_t cpus_chosen;
static void clocksource_verify_choose_cpus(void)
{
int cpu, i, n = verify_n_cpus;
if (n < 0) {
/* Check all of the CPUs. */
cpumask_copy(&cpus_chosen, cpu_online_mask);
cpumask_clear_cpu(smp_processor_id(), &cpus_chosen);
return;
}
/* If no checking desired, or no other CPU to check, leave. */
cpumask_clear(&cpus_chosen);
if (n == 0 || num_online_cpus() <= 1)
return;
/* Make sure to select at least one CPU other than the current CPU. */
cpu = cpumask_next(-1, cpu_online_mask);
if (cpu == smp_processor_id())
cpu = cpumask_next(cpu, cpu_online_mask);
if (WARN_ON_ONCE(cpu >= nr_cpu_ids))
return;
cpumask_set_cpu(cpu, &cpus_chosen);
/* Force a sane value for the boot parameter. */
if (n > nr_cpu_ids)
n = nr_cpu_ids;
/*
* Randomly select the specified number of CPUs. If the same
* CPU is selected multiple times, that CPU is checked only once,
* and no replacement CPU is selected. This gracefully handles
* situations where verify_n_cpus is greater than the number of
* CPUs that are currently online.
*/
for (i = 1; i < n; i++) {
cpu = prandom_u32() % nr_cpu_ids;
cpu = cpumask_next(cpu - 1, cpu_online_mask);
if (cpu >= nr_cpu_ids)
cpu = cpumask_next(-1, cpu_online_mask);
if (!WARN_ON_ONCE(cpu >= nr_cpu_ids))
cpumask_set_cpu(cpu, &cpus_chosen);
}
/* Don't verify ourselves. */
cpumask_clear_cpu(smp_processor_id(), &cpus_chosen);
}
static void clocksource_verify_one_cpu(void *csin)
{
struct clocksource *cs = (struct clocksource *)csin;
csnow_mid = cs->read(cs);
}
void clocksource_verify_percpu(struct clocksource *cs)
{
int64_t cs_nsec, cs_nsec_max = 0, cs_nsec_min = LLONG_MAX;
u64 csnow_begin, csnow_end;
int cpu, testcpu;
s64 delta;
if (verify_n_cpus == 0)
return;
cpumask_clear(&cpus_ahead);
cpumask_clear(&cpus_behind);
get_online_cpus();
preempt_disable();
clocksource_verify_choose_cpus();
if (cpumask_weight(&cpus_chosen) == 0) {
preempt_enable();
put_online_cpus();
pr_warn("Not enough CPUs to check clocksource '%s'.\n", cs->name);
return;
}
testcpu = smp_processor_id();
pr_warn("Checking clocksource %s synchronization from CPU %d to CPUs %*pbl.\n", cs->name, testcpu, cpumask_pr_args(&cpus_chosen));
for_each_cpu(cpu, &cpus_chosen) {
if (cpu == testcpu)
continue;
csnow_begin = cs->read(cs);
smp_call_function_single(cpu, clocksource_verify_one_cpu, cs, 1);
csnow_end = cs->read(cs);
delta = (s64)((csnow_mid - csnow_begin) & cs->mask);
if (delta < 0)
cpumask_set_cpu(cpu, &cpus_behind);
delta = (csnow_end - csnow_mid) & cs->mask;
if (delta < 0)
cpumask_set_cpu(cpu, &cpus_ahead);
delta = clocksource_delta(csnow_end, csnow_begin, cs->mask);
cs_nsec = clocksource_cyc2ns(delta, cs->mult, cs->shift);
if (cs_nsec > cs_nsec_max)
cs_nsec_max = cs_nsec;
if (cs_nsec < cs_nsec_min)
cs_nsec_min = cs_nsec;
}
preempt_enable();
put_online_cpus();
if (!cpumask_empty(&cpus_ahead))
pr_warn(" CPUs %*pbl ahead of CPU %d for clocksource %s.\n",
cpumask_pr_args(&cpus_ahead), testcpu, cs->name);
if (!cpumask_empty(&cpus_behind))
pr_warn(" CPUs %*pbl behind CPU %d for clocksource %s.\n",
cpumask_pr_args(&cpus_behind), testcpu, cs->name);
if (!cpumask_empty(&cpus_ahead) || !cpumask_empty(&cpus_behind))
pr_warn(" CPU %d check durations %lldns - %lldns for clocksource %s.\n",
testcpu, cs_nsec_min, cs_nsec_max, cs->name);
}
EXPORT_SYMBOL_GPL(clocksource_verify_percpu);
static void clocksource_watchdog(struct timer_list *unused)
{
struct clocksource *cs;
u64 csnow, wdnow, cslast, wdlast, delta;
int64_t wd_nsec, cs_nsec;
int next_cpu, reset_pending;
int64_t wd_nsec, cs_nsec;
struct clocksource *cs;
u32 md;
spin_lock(&watchdog_lock);
if (!watchdog_running)
@ -206,10 +373,11 @@ static void clocksource_watchdog(struct timer_list *unused)
continue;
}
local_irq_disable();
csnow = cs->read(cs);
wdnow = watchdog->read(watchdog);
local_irq_enable();
if (!cs_watchdog_read(cs, &csnow, &wdnow)) {
/* Clock readout unreliable, so give it up. */
__clocksource_unstable(cs);
continue;
}
/* Clocksource initialized ? */
if (!(cs->flags & CLOCK_SOURCE_WATCHDOG) ||
@ -235,13 +403,20 @@ static void clocksource_watchdog(struct timer_list *unused)
continue;
/* Check the deviation from the watchdog clocksource. */
if (abs(cs_nsec - wd_nsec) > WATCHDOG_THRESHOLD) {
md = cs->uncertainty_margin + watchdog->uncertainty_margin;
if (abs(cs_nsec - wd_nsec) > md) {
pr_warn("timekeeping watchdog on CPU%d: Marking clocksource '%s' as unstable because the skew is too large:\n",
smp_processor_id(), cs->name);
pr_warn(" '%s' wd_now: %llx wd_last: %llx mask: %llx\n",
watchdog->name, wdnow, wdlast, watchdog->mask);
pr_warn(" '%s' cs_now: %llx cs_last: %llx mask: %llx\n",
cs->name, csnow, cslast, cs->mask);
pr_warn(" '%s' wd_nsec: %lld wd_now: %llx wd_last: %llx mask: %llx\n",
watchdog->name, wd_nsec, wdnow, wdlast, watchdog->mask);
pr_warn(" '%s' cs_nsec: %lld cs_now: %llx cs_last: %llx mask: %llx\n",
cs->name, cs_nsec, csnow, cslast, cs->mask);
if (curr_clocksource == cs)
pr_warn(" '%s' is current clocksource.\n", cs->name);
else if (curr_clocksource)
pr_warn(" '%s' (not '%s') is current clocksource.\n", curr_clocksource->name, cs->name);
else
pr_warn(" No current clocksource.\n");
__clocksource_unstable(cs);
continue;
}
@ -407,6 +582,12 @@ static int __clocksource_watchdog_kthread(void)
unsigned long flags;
int select = 0;
/* Do any required per-CPU skew verification. */
if (curr_clocksource &&
curr_clocksource->flags & CLOCK_SOURCE_UNSTABLE &&
curr_clocksource->flags & CLOCK_SOURCE_VERIFY_PERCPU)
clocksource_verify_percpu(curr_clocksource);
spin_lock_irqsave(&watchdog_lock, flags);
list_for_each_entry_safe(cs, tmp, &watchdog_list, wd_list) {
if (cs->flags & CLOCK_SOURCE_UNSTABLE) {
@ -876,6 +1057,26 @@ void __clocksource_update_freq_scale(struct clocksource *cs, u32 scale, u32 freq
clocks_calc_mult_shift(&cs->mult, &cs->shift, freq,
NSEC_PER_SEC / scale, sec * scale);
}
/*
* If the uncertainty margin is not specified, calculate it.
* If both scale and freq are non-zero, calculate the clock
* period, but bound below at 2*WATCHDOG_MAX_SKEW. However,
* if either of scale or freq is zero, be very conservative and
* take the tens-of-milliseconds WATCHDOG_THRESHOLD value for the
* uncertainty margin. Allow stupidly small uncertainty margins
* to be specified by the caller for testing purposes, but warn
* to discourage production use of this capability.
*/
if (scale && freq && !cs->uncertainty_margin) {
cs->uncertainty_margin = NSEC_PER_SEC / (scale * freq);
if (cs->uncertainty_margin < 2 * WATCHDOG_MAX_SKEW)
cs->uncertainty_margin = 2 * WATCHDOG_MAX_SKEW;
} else if (!cs->uncertainty_margin) {
cs->uncertainty_margin = WATCHDOG_THRESHOLD;
}
WARN_ON_ONCE(cs->uncertainty_margin < 2 * WATCHDOG_MAX_SKEW);
/*
* Ensure clocksources that have large 'mult' values don't overflow
* when adjusted.

15
kernel/time/jiffies.c
View File

@ -49,13 +49,14 @@ static u64 jiffies_read(struct clocksource *cs)
* for "tick-less" systems.
*/
static struct clocksource clocksource_jiffies = {
.name = "jiffies",
.rating = 1, /* lowest valid rating*/
.read = jiffies_read,
.mask = CLOCKSOURCE_MASK(32),
.mult = TICK_NSEC << JIFFIES_SHIFT, /* details above */
.shift = JIFFIES_SHIFT,
.max_cycles = 10,
.name = "jiffies",
.rating = 1, /* lowest valid rating*/
.uncertainty_margin = 32 * NSEC_PER_MSEC,
.read = jiffies_read,
.mask = CLOCKSOURCE_MASK(32),
.mult = TICK_NSEC << JIFFIES_SHIFT, /* details above */
.shift = JIFFIES_SHIFT,
.max_cycles = 10,
};
__cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(jiffies_lock);

143
kernel/time/tick-broadcast.c
View File

@ -33,6 +33,8 @@ static int tick_broadcast_forced;
static __cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(tick_broadcast_lock);
#ifdef CONFIG_TICK_ONESHOT
static DEFINE_PER_CPU(struct clock_event_device *, tick_oneshot_wakeup_device);
static void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
static void tick_broadcast_clear_oneshot(int cpu);
static void tick_resume_broadcast_oneshot(struct clock_event_device *bc);
@ -61,6 +63,13 @@ struct cpumask *tick_get_broadcast_mask(void)
return tick_broadcast_mask;
}
static struct clock_event_device *tick_get_oneshot_wakeup_device(int cpu);
const struct clock_event_device *tick_get_wakeup_device(int cpu)
{
return tick_get_oneshot_wakeup_device(cpu);
}
/*
* Start the device in periodic mode
*/
@ -88,13 +97,75 @@ static bool tick_check_broadcast_device(struct clock_event_device *curdev,
return !curdev || newdev->rating > curdev->rating;
}
#ifdef CONFIG_TICK_ONESHOT
static struct clock_event_device *tick_get_oneshot_wakeup_device(int cpu)
{
return per_cpu(tick_oneshot_wakeup_device, cpu);
}
static void tick_oneshot_wakeup_handler(struct clock_event_device *wd)
{
/*
* If we woke up early and the tick was reprogrammed in the
* meantime then this may be spurious but harmless.
*/
tick_receive_broadcast();
}
static bool tick_set_oneshot_wakeup_device(struct clock_event_device *newdev,
int cpu)
{
struct clock_event_device *curdev = tick_get_oneshot_wakeup_device(cpu);
if (!newdev)
goto set_device;
if ((newdev->features & CLOCK_EVT_FEAT_DUMMY) ||
(newdev->features & CLOCK_EVT_FEAT_C3STOP))
return false;
if (!(newdev->features & CLOCK_EVT_FEAT_PERCPU) ||
!(newdev->features & CLOCK_EVT_FEAT_ONESHOT))
return false;
if (!cpumask_equal(newdev->cpumask, cpumask_of(cpu)))
return false;
if (curdev && newdev->rating <= curdev->rating)
return false;
if (!try_module_get(newdev->owner))
return false;
newdev->event_handler = tick_oneshot_wakeup_handler;
set_device:
clockevents_exchange_device(curdev, newdev);
per_cpu(tick_oneshot_wakeup_device, cpu) = newdev;
return true;
}
#else
static struct clock_event_device *tick_get_oneshot_wakeup_device(int cpu)
{
return NULL;
}
static bool tick_set_oneshot_wakeup_device(struct clock_event_device *newdev,
int cpu)
{
return false;
}
#endif
/*
* Conditionally install/replace broadcast device
*/
void tick_install_broadcast_device(struct clock_event_device *dev)
void tick_install_broadcast_device(struct clock_event_device *dev, int cpu)
{
struct clock_event_device *cur = tick_broadcast_device.evtdev;
if (tick_set_oneshot_wakeup_device(dev, cpu))
return;
if (!tick_check_broadcast_device(cur, dev))
return;
@ -253,7 +324,6 @@ int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu)
return ret;
}
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
int tick_receive_broadcast(void)
{
struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
@ -268,7 +338,6 @@ int tick_receive_broadcast(void)
evt->event_handler(evt);
return 0;
}
#endif
/*
* Broadcast the event to the cpus, which are set in the mask (mangled).
@ -719,24 +788,16 @@ static void broadcast_shutdown_local(struct clock_event_device *bc,
clockevents_switch_state(dev, CLOCK_EVT_STATE_SHUTDOWN);
}
int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
static int ___tick_broadcast_oneshot_control(enum tick_broadcast_state state,
struct tick_device *td,
int cpu)
{
struct clock_event_device *bc, *dev;
int cpu, ret = 0;
struct clock_event_device *bc, *dev = td->evtdev;
int ret = 0;
ktime_t now;
/*
* If there is no broadcast device, tell the caller not to go
* into deep idle.
*/
if (!tick_broadcast_device.evtdev)
return -EBUSY;
dev = this_cpu_ptr(&tick_cpu_device)->evtdev;
raw_spin_lock(&tick_broadcast_lock);
bc = tick_broadcast_device.evtdev;
cpu = smp_processor_id();
if (state == TICK_BROADCAST_ENTER) {
/*
@ -865,6 +926,53 @@ out:
return ret;
}
static int tick_oneshot_wakeup_control(enum tick_broadcast_state state,
struct tick_device *td,
int cpu)
{
struct clock_event_device *dev, *wd;
dev = td->evtdev;
if (td->mode != TICKDEV_MODE_ONESHOT)
return -EINVAL;
wd = tick_get_oneshot_wakeup_device(cpu);
if (!wd)
return -ENODEV;
switch (state) {
case TICK_BROADCAST_ENTER:
clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT_STOPPED);
clockevents_switch_state(wd, CLOCK_EVT_STATE_ONESHOT);
clockevents_program_event(wd, dev->next_event, 1);
break;
case TICK_BROADCAST_EXIT:
/* We may have transitioned to oneshot mode while idle */
if (clockevent_get_state(wd) != CLOCK_EVT_STATE_ONESHOT)
return -ENODEV;
}
return 0;
}
int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
{
struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
int cpu = smp_processor_id();
if (!tick_oneshot_wakeup_control(state, td, cpu))
return 0;
if (tick_broadcast_device.evtdev)
return ___tick_broadcast_oneshot_control(state, td, cpu);
/*
* If there is no broadcast or wakeup device, tell the caller not
* to go into deep idle.
*/
return -EBUSY;
}
/*
* Reset the one shot broadcast for a cpu
*
@ -991,6 +1099,9 @@ void hotplug_cpu__broadcast_tick_pull(int deadcpu)
*/
static void tick_broadcast_oneshot_offline(unsigned int cpu)
{
if (tick_get_oneshot_wakeup_device(cpu))
tick_set_oneshot_wakeup_device(NULL, cpu);
/*
* Clear the broadcast masks for the dead cpu, but do not stop
* the broadcast device!

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

@ -373,7 +373,7 @@ out_bc:
/*
* Can the new device be used as a broadcast device ?
*/
tick_install_broadcast_device(newdev);
tick_install_broadcast_device(newdev, cpu);
}
/**

5
kernel/time/tick-internal.h
View File

@ -61,7 +61,7 @@ extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
/* Broadcasting support */
# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
extern void tick_install_broadcast_device(struct clock_event_device *dev);
extern void tick_install_broadcast_device(struct clock_event_device *dev, int cpu);
extern int tick_is_broadcast_device(struct clock_event_device *dev);
extern void tick_suspend_broadcast(void);
extern void tick_resume_broadcast(void);
@ -71,8 +71,9 @@ extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadc
extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
extern struct tick_device *tick_get_broadcast_device(void);
extern struct cpumask *tick_get_broadcast_mask(void);
extern const struct clock_event_device *tick_get_wakeup_device(int cpu);
# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
static inline void tick_install_broadcast_device(struct clock_event_device *dev) { }
static inline void tick_install_broadcast_device(struct clock_event_device *dev, int cpu) { }
static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }

99
kernel/time/time_test.c Normal file
View File

@ -0,0 +1,99 @@
// SPDX-License-Identifier: LGPL-2.1+
#include <kunit/test.h>
#include <linux/time.h>
/*
* Traditional implementation of leap year evaluation.
*/
static bool is_leap(long year)
{
return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
}
/*
* Gets the last day of a month.
*/
static int last_day_of_month(long year, int month)
{
if (month == 2)
return 28 + is_leap(year);
if (month == 4 || month == 6 || month == 9 || month == 11)
return 30;
return 31;
}
/*
* Advances a date by one day.
*/
static void advance_date(long *year, int *month, int *mday, int *yday)
{
if (*mday != last_day_of_month(*year, *month)) {
++*mday;
++*yday;
return;
}
*mday = 1;
if (*month != 12) {
++*month;
++*yday;
return;
}
*month = 1;
*yday = 0;
++*year;
}
/*
* Checks every day in a 160000 years interval centered at 1970-01-01
* against the expected result.
*/
static void time64_to_tm_test_date_range(struct kunit *test)
{
/*
* 80000 years = (80000 / 400) * 400 years
* = (80000 / 400) * 146097 days
* = (80000 / 400) * 146097 * 86400 seconds
*/
time64_t total_secs = ((time64_t) 80000) / 400 * 146097 * 86400;
long year = 1970 - 80000;
int month = 1;
int mdday = 1;
int yday = 0;
struct tm result;
time64_t secs;
s64 days;
for (secs = -total_secs; secs <= total_secs; secs += 86400) {
time64_to_tm(secs, 0, &result);
days = div_s64(secs, 86400);
#define FAIL_MSG "%05ld/%02d/%02d (%2d) : %ld", \
year, month, mdday, yday, days
KUNIT_ASSERT_EQ_MSG(test, year - 1900, result.tm_year, FAIL_MSG);
KUNIT_ASSERT_EQ_MSG(test, month - 1, result.tm_mon, FAIL_MSG);
KUNIT_ASSERT_EQ_MSG(test, mdday, result.tm_mday, FAIL_MSG);
KUNIT_ASSERT_EQ_MSG(test, yday, result.tm_yday, FAIL_MSG);
advance_date(&year, &month, &mdday, &yday);
}
}
static struct kunit_case time_test_cases[] = {
KUNIT_CASE(time64_to_tm_test_date_range),
{}
};
static struct kunit_suite time_test_suite = {
.name = "time_test_cases",
.test_cases = time_test_cases,
};
kunit_test_suite(time_test_suite);
MODULE_LICENSE("GPL");

116
kernel/time/timeconv.c
View File

@ -22,47 +22,16 @@
/*
* Converts the calendar time to broken-down time representation
* Based on code from glibc-2.6
*
* 2009-7-14:
* Moved from glibc-2.6 to kernel by Zhaolei<zhaolei@cn.fujitsu.com>
* 2021-06-02:
* Reimplemented by Cassio Neri <cassio.neri@gmail.com>
*/
#include <linux/time.h>
#include <linux/module.h>
/*
* Nonzero if YEAR is a leap year (every 4 years,
* except every 100th isn't, and every 400th is).
*/
static int __isleap(long year)
{
return (year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0);
}
/* do a mathdiv for long type */
static long math_div(long a, long b)
{
return a / b - (a % b < 0);
}
/* How many leap years between y1 and y2, y1 must less or equal to y2 */
static long leaps_between(long y1, long y2)
{
long leaps1 = math_div(y1 - 1, 4) - math_div(y1 - 1, 100)
+ math_div(y1 - 1, 400);
long leaps2 = math_div(y2 - 1, 4) - math_div(y2 - 1, 100)
+ math_div(y2 - 1, 400);
return leaps2 - leaps1;
}
/* How many days come before each month (0-12). */
static const unsigned short __mon_yday[2][13] = {
/* Normal years. */
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
/* Leap years. */
{0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
};
#include <linux/kernel.h>
#define SECS_PER_HOUR (60 * 60)
#define SECS_PER_DAY (SECS_PER_HOUR * 24)
@ -77,9 +46,11 @@ static const unsigned short __mon_yday[2][13] = {
*/
void time64_to_tm(time64_t totalsecs, int offset, struct tm *result)
{
long days, rem, y;
u32 u32tmp, day_of_century, year_of_century, day_of_year, month, day;
u64 u64tmp, udays, century, year;
bool is_Jan_or_Feb, is_leap_year;
long days, rem;
int remainder;
const unsigned short *ip;
days = div_s64_rem(totalsecs, SECS_PER_DAY, &remainder);
rem = remainder;
@ -103,27 +74,68 @@ void time64_to_tm(time64_t totalsecs, int offset, struct tm *result)
if (result->tm_wday < 0)
result->tm_wday += 7;
y = 1970;
/*
* The following algorithm is, basically, Proposition 6.3 of Neri
* and Schneider [1]. In a few words: it works on the computational
* (fictitious) calendar where the year starts in March, month = 2
* (*), and finishes in February, month = 13. This calendar is
* mathematically convenient because the day of the year does not
* depend on whether the year is leap or not. For instance:
*
* March 1st 0-th day of the year;
* ...
* April 1st 31-st day of the year;
* ...
* January 1st 306-th day of the year; (Important!)
* ...
* February 28th 364-th day of the year;
* February 29th 365-th day of the year (if it exists).
*
* After having worked out the date in the computational calendar
* (using just arithmetics) it's easy to convert it to the
* corresponding date in the Gregorian calendar.
*
* [1] "Euclidean Affine Functions and Applications to Calendar
* Algorithms". https://arxiv.org/abs/2102.06959
*
* (*) The numbering of months follows tm more closely and thus,
* is slightly different from [1].
*/
while (days < 0 || days >= (__isleap(y) ? 366 : 365)) {
/* Guess a corrected year, assuming 365 days per year. */
long yg = y + math_div(days, 365);
udays = ((u64) days) + 2305843009213814918ULL;
/* Adjust DAYS and Y to match the guessed year. */
days -= (yg - y) * 365 + leaps_between(y, yg);
y = yg;
}
u64tmp = 4 * udays + 3;
century = div64_u64_rem(u64tmp, 146097, &u64tmp);
day_of_century = (u32) (u64tmp / 4);
result->tm_year = y - 1900;
u32tmp = 4 * day_of_century + 3;
u64tmp = 2939745ULL * u32tmp;
year_of_century = upper_32_bits(u64tmp);
day_of_year = lower_32_bits(u64tmp) / 2939745 / 4;
result->tm_yday = days;
year = 100 * century + year_of_century;
is_leap_year = year_of_century ? !(year_of_century % 4) : !(century % 4);
ip = __mon_yday[__isleap(y)];
for (y = 11; days < ip[y]; y--)
continue;
days -= ip[y];
u32tmp = 2141 * day_of_year + 132377;
month = u32tmp >> 16;
day = ((u16) u32tmp) / 2141;
result->tm_mon = y;
result->tm_mday = days + 1;
/*
* Recall that January 1st is the 306-th day of the year in the
* computational (not Gregorian) calendar.
*/
is_Jan_or_Feb = day_of_year >= 306;
/* Convert to the Gregorian calendar and adjust to Unix time. */
year = year + is_Jan_or_Feb - 6313183731940000ULL;
month = is_Jan_or_Feb ? month - 12 : month;
day = day + 1;
day_of_year += is_Jan_or_Feb ? -306 : 31 + 28 + is_leap_year;
/* Convert to tm's format. */
result->tm_year = (long) (year - 1900);
result->tm_mon = (int) month;
result->tm_mday = (int) day;
result->tm_yday = (int) day_of_year;
}
EXPORT_SYMBOL(time64_to_tm);

10
kernel/time/timer_list.c
View File

@ -228,6 +228,14 @@ print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
SEQ_printf(m, " event_handler: %ps\n", dev->event_handler);
SEQ_printf(m, "\n");
SEQ_printf(m, " retries: %lu\n", dev->retries);
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
if (cpu >= 0) {
const struct clock_event_device *wd = tick_get_wakeup_device(cpu);
SEQ_printf(m, "Wakeup Device: %s\n", wd ? wd->name : "<NULL>");
}
#endif
SEQ_printf(m, "\n");
}
@ -248,7 +256,7 @@ static void timer_list_show_tickdevices_header(struct seq_file *m)
static inline void timer_list_header(struct seq_file *m, u64 now)
{
SEQ_printf(m, "Timer List Version: v0.8\n");
SEQ_printf(m, "Timer List Version: v0.9\n");
SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
SEQ_printf(m, "\n");

12
lib/Kconfig.debug
View File

@ -2573,6 +2573,18 @@ config TEST_FPU
If unsure, say N.
config TEST_CLOCKSOURCE_WATCHDOG
tristate "Test clocksource watchdog in kernel space"
depends on CLOCKSOURCE_WATCHDOG
help
Enable this option to create a kernel module that will trigger
a test of the clocksource watchdog. This module may be loaded
via modprobe or insmod in which case it will run upon being
loaded, or it may be built in, in which case it will run
shortly after boot.
If unsure, say N.
endif # RUNTIME_TESTING_MENU
config ARCH_USE_MEMTEST