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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 department delivers this time:
- Support for cross clock domain timestamps in the core code plus a
first user. That allows more precise timestamping for PTP and
later for audio and other peripherals.
The ptp/e1000e patches have been acked by the relevant maintainers
and are carried in the timer tree to avoid merge ordering issues.
- Support for unregistering the current clocksource watchdog. That
lifts a limitation for switching clocksources which has been there
from day 1
- The usual pile of fixes and updates to the core and the drivers.
Nothing outstanding and exciting"
* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (26 commits)
time/timekeeping: Work around false positive GCC warning
e1000e: Adds hardware supported cross timestamp on e1000e nic
ptp: Add PTP_SYS_OFFSET_PRECISE for driver crosstimestamping
x86/tsc: Always Running Timer (ART) correlated clocksource
hrtimer: Revert CLOCK_MONOTONIC_RAW support
time: Add history to cross timestamp interface supporting slower devices
time: Add driver cross timestamp interface for higher precision time synchronization
time: Remove duplicated code in ktime_get_raw_and_real()
time: Add timekeeping snapshot code capturing system time and counter
time: Add cycles to nanoseconds translation
jiffies: Use CLOCKSOURCE_MASK instead of constant
clocksource: Introduce clocksource_freq2mult()
clockevents/drivers/exynos_mct: Implement ->set_state_oneshot_stopped()
clockevents/drivers/arm_global_timer: Implement ->set_state_oneshot_stopped()
clockevents/drivers/arm_arch_timer: Implement ->set_state_oneshot_stopped()
clocksource/drivers/arm_global_timer: Register delay timer
clocksource/drivers/lpc32xx: Support timer-based ARM delay
clocksource/drivers/lpc32xx: Support periodic mode
clocksource/drivers/lpc32xx: Don't use the prescaler counter for clockevents
clocksource/drivers/rockchip: Add err handle for rk_timer_init
...
This commit is contained in:
Linus Torvalds
commit
8a284c062e
@ -277,13 +277,15 @@ int main(int argc, char *argv[])
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" %d external time stamp channels\n"
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" %d programmable periodic signals\n"
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" %d pulse per second\n"
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" %d programmable pins\n",
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" %d programmable pins\n"
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" %d cross timestamping\n",
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caps.max_adj,
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caps.n_alarm,
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caps.n_ext_ts,
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caps.n_per_out,
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caps.pps,
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caps.n_pins);
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caps.n_pins,
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caps.cross_timestamping);
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}
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}
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@ -85,7 +85,7 @@
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#define X86_FEATURE_P4 ( 3*32+ 7) /* "" P4 */
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#define X86_FEATURE_CONSTANT_TSC ( 3*32+ 8) /* TSC ticks at a constant rate */
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#define X86_FEATURE_UP ( 3*32+ 9) /* smp kernel running on up */
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/* free, was #define X86_FEATURE_FXSAVE_LEAK ( 3*32+10) * "" FXSAVE leaks FOP/FIP/FOP */
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#define X86_FEATURE_ART ( 3*32+10) /* Platform has always running timer (ART) */
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#define X86_FEATURE_ARCH_PERFMON ( 3*32+11) /* Intel Architectural PerfMon */
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#define X86_FEATURE_PEBS ( 3*32+12) /* Precise-Event Based Sampling */
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#define X86_FEATURE_BTS ( 3*32+13) /* Branch Trace Store */
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@ -29,6 +29,8 @@ static inline cycles_t get_cycles(void)
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return rdtsc();
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}
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extern struct system_counterval_t convert_art_to_tsc(cycle_t art);
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extern void tsc_init(void);
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extern void mark_tsc_unstable(char *reason);
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extern int unsynchronized_tsc(void);
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@ -43,6 +43,11 @@ static DEFINE_STATIC_KEY_FALSE(__use_tsc);
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int tsc_clocksource_reliable;
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static u32 art_to_tsc_numerator;
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static u32 art_to_tsc_denominator;
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static u64 art_to_tsc_offset;
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struct clocksource *art_related_clocksource;
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/*
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* Use a ring-buffer like data structure, where a writer advances the head by
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* writing a new data entry and a reader advances the tail when it observes a
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@ -964,6 +969,37 @@ core_initcall(cpufreq_tsc);
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#endif /* CONFIG_CPU_FREQ */
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#define ART_CPUID_LEAF (0x15)
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#define ART_MIN_DENOMINATOR (1)
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/*
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* If ART is present detect the numerator:denominator to convert to TSC
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*/
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static void detect_art(void)
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{
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unsigned int unused[2];
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if (boot_cpu_data.cpuid_level < ART_CPUID_LEAF)
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return;
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cpuid(ART_CPUID_LEAF, &art_to_tsc_denominator,
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&art_to_tsc_numerator, unused, unused+1);
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/* Don't enable ART in a VM, non-stop TSC required */
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if (boot_cpu_has(X86_FEATURE_HYPERVISOR) ||
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!boot_cpu_has(X86_FEATURE_NONSTOP_TSC) ||
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art_to_tsc_denominator < ART_MIN_DENOMINATOR)
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return;
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if (rdmsrl_safe(MSR_IA32_TSC_ADJUST, &art_to_tsc_offset))
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return;
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/* Make this sticky over multiple CPU init calls */
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setup_force_cpu_cap(X86_FEATURE_ART);
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}
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/* clocksource code */
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static struct clocksource clocksource_tsc;
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@ -1071,6 +1107,25 @@ int unsynchronized_tsc(void)
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return 0;
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}
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/*
|
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* Convert ART to TSC given numerator/denominator found in detect_art()
|
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*/
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struct system_counterval_t convert_art_to_tsc(cycle_t art)
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{
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u64 tmp, res, rem;
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rem = do_div(art, art_to_tsc_denominator);
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res = art * art_to_tsc_numerator;
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tmp = rem * art_to_tsc_numerator;
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do_div(tmp, art_to_tsc_denominator);
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res += tmp + art_to_tsc_offset;
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return (struct system_counterval_t) {.cs = art_related_clocksource,
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.cycles = res};
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}
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EXPORT_SYMBOL(convert_art_to_tsc);
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static void tsc_refine_calibration_work(struct work_struct *work);
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static DECLARE_DELAYED_WORK(tsc_irqwork, tsc_refine_calibration_work);
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@ -1142,6 +1197,8 @@ static void tsc_refine_calibration_work(struct work_struct *work)
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(unsigned long)tsc_khz % 1000);
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out:
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if (boot_cpu_has(X86_FEATURE_ART))
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art_related_clocksource = &clocksource_tsc;
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clocksource_register_khz(&clocksource_tsc, tsc_khz);
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}
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@ -1235,6 +1292,8 @@ void __init tsc_init(void)
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mark_tsc_unstable("TSCs unsynchronized");
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check_system_tsc_reliable();
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detect_art();
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}
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#ifdef CONFIG_SMP
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@ -160,6 +160,7 @@ config CLKSRC_EFM32
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config CLKSRC_LPC32XX
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bool "Clocksource for LPC32XX" if COMPILE_TEST
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depends on GENERIC_CLOCKEVENTS && HAS_IOMEM
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depends on ARM
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select CLKSRC_MMIO
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select CLKSRC_OF
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help
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@ -32,6 +32,14 @@
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#define CNTTIDR 0x08
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#define CNTTIDR_VIRT(n) (BIT(1) << ((n) * 4))
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#define CNTACR(n) (0x40 + ((n) * 4))
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#define CNTACR_RPCT BIT(0)
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#define CNTACR_RVCT BIT(1)
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#define CNTACR_RFRQ BIT(2)
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#define CNTACR_RVOFF BIT(3)
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#define CNTACR_RWVT BIT(4)
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#define CNTACR_RWPT BIT(5)
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#define CNTVCT_LO 0x08
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#define CNTVCT_HI 0x0c
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#define CNTFRQ 0x10
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@ -266,10 +274,12 @@ static void __arch_timer_setup(unsigned type,
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if (arch_timer_use_virtual) {
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clk->irq = arch_timer_ppi[VIRT_PPI];
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clk->set_state_shutdown = arch_timer_shutdown_virt;
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clk->set_state_oneshot_stopped = arch_timer_shutdown_virt;
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clk->set_next_event = arch_timer_set_next_event_virt;
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} else {
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clk->irq = arch_timer_ppi[PHYS_SECURE_PPI];
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clk->set_state_shutdown = arch_timer_shutdown_phys;
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clk->set_state_oneshot_stopped = arch_timer_shutdown_phys;
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clk->set_next_event = arch_timer_set_next_event_phys;
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}
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} else {
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@ -279,10 +289,12 @@ static void __arch_timer_setup(unsigned type,
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clk->cpumask = cpu_all_mask;
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if (arch_timer_mem_use_virtual) {
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clk->set_state_shutdown = arch_timer_shutdown_virt_mem;
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clk->set_state_oneshot_stopped = arch_timer_shutdown_virt_mem;
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clk->set_next_event =
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arch_timer_set_next_event_virt_mem;
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} else {
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clk->set_state_shutdown = arch_timer_shutdown_phys_mem;
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clk->set_state_oneshot_stopped = arch_timer_shutdown_phys_mem;
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clk->set_next_event =
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arch_timer_set_next_event_phys_mem;
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}
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@ -757,7 +769,6 @@ static void __init arch_timer_mem_init(struct device_node *np)
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}
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cnttidr = readl_relaxed(cntctlbase + CNTTIDR);
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iounmap(cntctlbase);
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/*
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* Try to find a virtual capable frame. Otherwise fall back to a
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@ -765,20 +776,31 @@ static void __init arch_timer_mem_init(struct device_node *np)
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*/
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for_each_available_child_of_node(np, frame) {
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int n;
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u32 cntacr;
|
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if (of_property_read_u32(frame, "frame-number", &n)) {
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pr_err("arch_timer: Missing frame-number\n");
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of_node_put(best_frame);
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of_node_put(frame);
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return;
|
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goto out;
|
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}
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|
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if (cnttidr & CNTTIDR_VIRT(n)) {
|
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/* Try enabling everything, and see what sticks */
|
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cntacr = CNTACR_RFRQ | CNTACR_RWPT | CNTACR_RPCT |
|
||||
CNTACR_RWVT | CNTACR_RVOFF | CNTACR_RVCT;
|
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writel_relaxed(cntacr, cntctlbase + CNTACR(n));
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cntacr = readl_relaxed(cntctlbase + CNTACR(n));
|
||||
|
||||
if ((cnttidr & CNTTIDR_VIRT(n)) &&
|
||||
!(~cntacr & (CNTACR_RWVT | CNTACR_RVCT))) {
|
||||
of_node_put(best_frame);
|
||||
best_frame = frame;
|
||||
arch_timer_mem_use_virtual = true;
|
||||
break;
|
||||
}
|
||||
|
||||
if (~cntacr & (CNTACR_RWPT | CNTACR_RPCT))
|
||||
continue;
|
||||
|
||||
of_node_put(best_frame);
|
||||
best_frame = of_node_get(frame);
|
||||
}
|
||||
@ -786,24 +808,26 @@ static void __init arch_timer_mem_init(struct device_node *np)
|
||||
base = arch_counter_base = of_iomap(best_frame, 0);
|
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if (!base) {
|
||||
pr_err("arch_timer: Can't map frame's registers\n");
|
||||
of_node_put(best_frame);
|
||||
return;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (arch_timer_mem_use_virtual)
|
||||
irq = irq_of_parse_and_map(best_frame, 1);
|
||||
else
|
||||
irq = irq_of_parse_and_map(best_frame, 0);
|
||||
of_node_put(best_frame);
|
||||
|
||||
if (!irq) {
|
||||
pr_err("arch_timer: Frame missing %s irq",
|
||||
arch_timer_mem_use_virtual ? "virt" : "phys");
|
||||
return;
|
||||
goto out;
|
||||
}
|
||||
|
||||
arch_timer_detect_rate(base, np);
|
||||
arch_timer_mem_register(base, irq);
|
||||
arch_timer_common_init();
|
||||
out:
|
||||
iounmap(cntctlbase);
|
||||
of_node_put(best_frame);
|
||||
}
|
||||
CLOCKSOURCE_OF_DECLARE(armv7_arch_timer_mem, "arm,armv7-timer-mem",
|
||||
arch_timer_mem_init);
|
||||
|
||||
@ -16,6 +16,7 @@
|
||||
#include <linux/clockchips.h>
|
||||
#include <linux/cpu.h>
|
||||
#include <linux/clk.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/of.h>
|
||||
@ -174,6 +175,7 @@ static int gt_clockevents_init(struct clock_event_device *clk)
|
||||
clk->set_state_shutdown = gt_clockevent_shutdown;
|
||||
clk->set_state_periodic = gt_clockevent_set_periodic;
|
||||
clk->set_state_oneshot = gt_clockevent_shutdown;
|
||||
clk->set_state_oneshot_stopped = gt_clockevent_shutdown;
|
||||
clk->set_next_event = gt_clockevent_set_next_event;
|
||||
clk->cpumask = cpumask_of(cpu);
|
||||
clk->rating = 300;
|
||||
@ -221,6 +223,21 @@ static u64 notrace gt_sched_clock_read(void)
|
||||
}
|
||||
#endif
|
||||
|
||||
static unsigned long gt_read_long(void)
|
||||
{
|
||||
return readl_relaxed(gt_base + GT_COUNTER0);
|
||||
}
|
||||
|
||||
static struct delay_timer gt_delay_timer = {
|
||||
.read_current_timer = gt_read_long,
|
||||
};
|
||||
|
||||
static void __init gt_delay_timer_init(void)
|
||||
{
|
||||
gt_delay_timer.freq = gt_clk_rate;
|
||||
register_current_timer_delay(>_delay_timer);
|
||||
}
|
||||
|
||||
static void __init gt_clocksource_init(void)
|
||||
{
|
||||
writel(0, gt_base + GT_CONTROL);
|
||||
@ -317,6 +334,7 @@ static void __init global_timer_of_register(struct device_node *np)
|
||||
/* Immediately configure the timer on the boot CPU */
|
||||
gt_clocksource_init();
|
||||
gt_clockevents_init(this_cpu_ptr(gt_evt));
|
||||
gt_delay_timer_init();
|
||||
|
||||
return;
|
||||
|
||||
|
||||
@ -313,6 +313,7 @@ static struct clock_event_device mct_comp_device = {
|
||||
.set_state_periodic = mct_set_state_periodic,
|
||||
.set_state_shutdown = mct_set_state_shutdown,
|
||||
.set_state_oneshot = mct_set_state_shutdown,
|
||||
.set_state_oneshot_stopped = mct_set_state_shutdown,
|
||||
.tick_resume = mct_set_state_shutdown,
|
||||
};
|
||||
|
||||
@ -452,6 +453,7 @@ static int exynos4_local_timer_setup(struct mct_clock_event_device *mevt)
|
||||
evt->set_state_periodic = set_state_periodic;
|
||||
evt->set_state_shutdown = set_state_shutdown;
|
||||
evt->set_state_oneshot = set_state_shutdown;
|
||||
evt->set_state_oneshot_stopped = set_state_shutdown;
|
||||
evt->tick_resume = set_state_shutdown;
|
||||
evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
|
||||
evt->rating = 450;
|
||||
|
||||
@ -122,23 +122,23 @@ static void __init rk_timer_init(struct device_node *np)
|
||||
pclk = of_clk_get_by_name(np, "pclk");
|
||||
if (IS_ERR(pclk)) {
|
||||
pr_err("Failed to get pclk for '%s'\n", TIMER_NAME);
|
||||
return;
|
||||
goto out_unmap;
|
||||
}
|
||||
|
||||
if (clk_prepare_enable(pclk)) {
|
||||
pr_err("Failed to enable pclk for '%s'\n", TIMER_NAME);
|
||||
return;
|
||||
goto out_unmap;
|
||||
}
|
||||
|
||||
timer_clk = of_clk_get_by_name(np, "timer");
|
||||
if (IS_ERR(timer_clk)) {
|
||||
pr_err("Failed to get timer clock for '%s'\n", TIMER_NAME);
|
||||
return;
|
||||
goto out_timer_clk;
|
||||
}
|
||||
|
||||
if (clk_prepare_enable(timer_clk)) {
|
||||
pr_err("Failed to enable timer clock\n");
|
||||
return;
|
||||
goto out_timer_clk;
|
||||
}
|
||||
|
||||
bc_timer.freq = clk_get_rate(timer_clk);
|
||||
@ -146,7 +146,7 @@ static void __init rk_timer_init(struct device_node *np)
|
||||
irq = irq_of_parse_and_map(np, 0);
|
||||
if (!irq) {
|
||||
pr_err("Failed to map interrupts for '%s'\n", TIMER_NAME);
|
||||
return;
|
||||
goto out_irq;
|
||||
}
|
||||
|
||||
ce->name = TIMER_NAME;
|
||||
@ -164,10 +164,19 @@ static void __init rk_timer_init(struct device_node *np)
|
||||
ret = request_irq(irq, rk_timer_interrupt, IRQF_TIMER, TIMER_NAME, ce);
|
||||
if (ret) {
|
||||
pr_err("Failed to initialize '%s': %d\n", TIMER_NAME, ret);
|
||||
return;
|
||||
goto out_irq;
|
||||
}
|
||||
|
||||
clockevents_config_and_register(ce, bc_timer.freq, 1, UINT_MAX);
|
||||
|
||||
return;
|
||||
|
||||
out_irq:
|
||||
clk_disable_unprepare(timer_clk);
|
||||
out_timer_clk:
|
||||
clk_disable_unprepare(pclk);
|
||||
out_unmap:
|
||||
iounmap(bc_timer.base);
|
||||
}
|
||||
|
||||
CLOCKSOURCE_OF_DECLARE(rk_timer, "rockchip,rk3288-timer", rk_timer_init);
|
||||
|
||||
@ -18,6 +18,7 @@
|
||||
#include <linux/clk.h>
|
||||
#include <linux/clockchips.h>
|
||||
#include <linux/clocksource.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/irq.h>
|
||||
#include <linux/kernel.h>
|
||||
@ -43,6 +44,7 @@
|
||||
struct lpc32xx_clock_event_ddata {
|
||||
struct clock_event_device evtdev;
|
||||
void __iomem *base;
|
||||
u32 ticks_per_jiffy;
|
||||
};
|
||||
|
||||
/* Needed for the sched clock */
|
||||
@ -53,6 +55,15 @@ static u64 notrace lpc32xx_read_sched_clock(void)
|
||||
return readl(clocksource_timer_counter);
|
||||
}
|
||||
|
||||
static unsigned long lpc32xx_delay_timer_read(void)
|
||||
{
|
||||
return readl(clocksource_timer_counter);
|
||||
}
|
||||
|
||||
static struct delay_timer lpc32xx_delay_timer = {
|
||||
.read_current_timer = lpc32xx_delay_timer_read,
|
||||
};
|
||||
|
||||
static int lpc32xx_clkevt_next_event(unsigned long delta,
|
||||
struct clock_event_device *evtdev)
|
||||
{
|
||||
@ -60,14 +71,13 @@ static int lpc32xx_clkevt_next_event(unsigned long delta,
|
||||
container_of(evtdev, struct lpc32xx_clock_event_ddata, evtdev);
|
||||
|
||||
/*
|
||||
* Place timer in reset and program the delta in the prescale
|
||||
* register (PR). When the prescale counter matches the value
|
||||
* in PR the counter register is incremented and the compare
|
||||
* match will trigger. After setup the timer is released from
|
||||
* reset and enabled.
|
||||
* Place timer in reset and program the delta in the match
|
||||
* channel 0 (MR0). When the timer counter matches the value
|
||||
* in MR0 register the match will trigger an interrupt.
|
||||
* After setup the timer is released from reset and enabled.
|
||||
*/
|
||||
writel_relaxed(LPC32XX_TIMER_TCR_CRST, ddata->base + LPC32XX_TIMER_TCR);
|
||||
writel_relaxed(delta, ddata->base + LPC32XX_TIMER_PR);
|
||||
writel_relaxed(delta, ddata->base + LPC32XX_TIMER_MR0);
|
||||
writel_relaxed(LPC32XX_TIMER_TCR_CEN, ddata->base + LPC32XX_TIMER_TCR);
|
||||
|
||||
return 0;
|
||||
@ -86,11 +96,39 @@ static int lpc32xx_clkevt_shutdown(struct clock_event_device *evtdev)
|
||||
|
||||
static int lpc32xx_clkevt_oneshot(struct clock_event_device *evtdev)
|
||||
{
|
||||
struct lpc32xx_clock_event_ddata *ddata =
|
||||
container_of(evtdev, struct lpc32xx_clock_event_ddata, evtdev);
|
||||
|
||||
/*
|
||||
* When using oneshot, we must also disable the timer
|
||||
* to wait for the first call to set_next_event().
|
||||
*/
|
||||
return lpc32xx_clkevt_shutdown(evtdev);
|
||||
writel_relaxed(0, ddata->base + LPC32XX_TIMER_TCR);
|
||||
|
||||
/* Enable interrupt, reset on match and stop on match (MCR). */
|
||||
writel_relaxed(LPC32XX_TIMER_MCR_MR0I | LPC32XX_TIMER_MCR_MR0R |
|
||||
LPC32XX_TIMER_MCR_MR0S, ddata->base + LPC32XX_TIMER_MCR);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int lpc32xx_clkevt_periodic(struct clock_event_device *evtdev)
|
||||
{
|
||||
struct lpc32xx_clock_event_ddata *ddata =
|
||||
container_of(evtdev, struct lpc32xx_clock_event_ddata, evtdev);
|
||||
|
||||
/* Enable interrupt and reset on match. */
|
||||
writel_relaxed(LPC32XX_TIMER_MCR_MR0I | LPC32XX_TIMER_MCR_MR0R,
|
||||
ddata->base + LPC32XX_TIMER_MCR);
|
||||
|
||||
/*
|
||||
* Place timer in reset and program the delta in the match
|
||||
* channel 0 (MR0).
|
||||
*/
|
||||
writel_relaxed(LPC32XX_TIMER_TCR_CRST, ddata->base + LPC32XX_TIMER_TCR);
|
||||
writel_relaxed(ddata->ticks_per_jiffy, ddata->base + LPC32XX_TIMER_MR0);
|
||||
writel_relaxed(LPC32XX_TIMER_TCR_CEN, ddata->base + LPC32XX_TIMER_TCR);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static irqreturn_t lpc32xx_clock_event_handler(int irq, void *dev_id)
|
||||
@ -108,11 +146,13 @@ static irqreturn_t lpc32xx_clock_event_handler(int irq, void *dev_id)
|
||||
static struct lpc32xx_clock_event_ddata lpc32xx_clk_event_ddata = {
|
||||
.evtdev = {
|
||||
.name = "lpc3220 clockevent",
|
||||
.features = CLOCK_EVT_FEAT_ONESHOT,
|
||||
.features = CLOCK_EVT_FEAT_ONESHOT |
|
||||
CLOCK_EVT_FEAT_PERIODIC,
|
||||
.rating = 300,
|
||||
.set_next_event = lpc32xx_clkevt_next_event,
|
||||
.set_state_shutdown = lpc32xx_clkevt_shutdown,
|
||||
.set_state_oneshot = lpc32xx_clkevt_oneshot,
|
||||
.set_state_periodic = lpc32xx_clkevt_periodic,
|
||||
},
|
||||
};
|
||||
|
||||
@ -162,6 +202,8 @@ static int __init lpc32xx_clocksource_init(struct device_node *np)
|
||||
}
|
||||
|
||||
clocksource_timer_counter = base + LPC32XX_TIMER_TC;
|
||||
lpc32xx_delay_timer.freq = rate;
|
||||
register_current_timer_delay(&lpc32xx_delay_timer);
|
||||
sched_clock_register(lpc32xx_read_sched_clock, 32, rate);
|
||||
|
||||
return 0;
|
||||
@ -210,18 +252,16 @@ static int __init lpc32xx_clockevent_init(struct device_node *np)
|
||||
|
||||
/*
|
||||
* Disable timer and clear any pending interrupt (IR) on match
|
||||
* channel 0 (MR0). Configure a compare match value of 1 on MR0
|
||||
* and enable interrupt, reset on match and stop on match (MCR).
|
||||
* channel 0 (MR0). Clear the prescaler as it's not used.
|
||||
*/
|
||||
writel_relaxed(0, base + LPC32XX_TIMER_TCR);
|
||||
writel_relaxed(0, base + LPC32XX_TIMER_PR);
|
||||
writel_relaxed(0, base + LPC32XX_TIMER_CTCR);
|
||||
writel_relaxed(LPC32XX_TIMER_IR_MR0INT, base + LPC32XX_TIMER_IR);
|
||||
writel_relaxed(1, base + LPC32XX_TIMER_MR0);
|
||||
writel_relaxed(LPC32XX_TIMER_MCR_MR0I | LPC32XX_TIMER_MCR_MR0R |
|
||||
LPC32XX_TIMER_MCR_MR0S, base + LPC32XX_TIMER_MCR);
|
||||
|
||||
rate = clk_get_rate(clk);
|
||||
lpc32xx_clk_event_ddata.base = base;
|
||||
lpc32xx_clk_event_ddata.ticks_per_jiffy = DIV_ROUND_CLOSEST(rate, HZ);
|
||||
clockevents_config_and_register(&lpc32xx_clk_event_ddata.evtdev,
|
||||
rate, 1, -1);
|
||||
|
||||
|
||||
@ -83,6 +83,15 @@ config E1000E
|
||||
To compile this driver as a module, choose M here. The module
|
||||
will be called e1000e.
|
||||
|
||||
config E1000E_HWTS
|
||||
bool "Support HW cross-timestamp on PCH devices"
|
||||
default y
|
||||
depends on E1000E && X86
|
||||
---help---
|
||||
Say Y to enable hardware supported cross-timestamping on PCH
|
||||
devices. The cross-timestamp is available through the PTP clock
|
||||
driver precise cross-timestamp ioctl (PTP_SYS_OFFSET_PRECISE).
|
||||
|
||||
config IGB
|
||||
tristate "Intel(R) 82575/82576 PCI-Express Gigabit Ethernet support"
|
||||
depends on PCI
|
||||
|
||||
@ -528,6 +528,11 @@
|
||||
#define E1000_RXCW_C 0x20000000 /* Receive config */
|
||||
#define E1000_RXCW_SYNCH 0x40000000 /* Receive config synch */
|
||||
|
||||
/* HH Time Sync */
|
||||
#define E1000_TSYNCTXCTL_MAX_ALLOWED_DLY_MASK 0x0000F000 /* max delay */
|
||||
#define E1000_TSYNCTXCTL_SYNC_COMP 0x40000000 /* sync complete */
|
||||
#define E1000_TSYNCTXCTL_START_SYNC 0x80000000 /* initiate sync */
|
||||
|
||||
#define E1000_TSYNCTXCTL_VALID 0x00000001 /* Tx timestamp valid */
|
||||
#define E1000_TSYNCTXCTL_ENABLED 0x00000010 /* enable Tx timestamping */
|
||||
|
||||
|
||||
@ -26,6 +26,12 @@
|
||||
|
||||
#include "e1000.h"
|
||||
|
||||
#ifdef CONFIG_E1000E_HWTS
|
||||
#include <linux/clocksource.h>
|
||||
#include <linux/ktime.h>
|
||||
#include <asm/tsc.h>
|
||||
#endif
|
||||
|
||||
/**
|
||||
* e1000e_phc_adjfreq - adjust the frequency of the hardware clock
|
||||
* @ptp: ptp clock structure
|
||||
@ -98,6 +104,78 @@ static int e1000e_phc_adjtime(struct ptp_clock_info *ptp, s64 delta)
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_E1000E_HWTS
|
||||
#define MAX_HW_WAIT_COUNT (3)
|
||||
|
||||
/**
|
||||
* e1000e_phc_get_syncdevicetime - Callback given to timekeeping code reads system/device registers
|
||||
* @device: current device time
|
||||
* @system: system counter value read synchronously with device time
|
||||
* @ctx: context provided by timekeeping code
|
||||
*
|
||||
* Read device and system (ART) clock simultaneously and return the corrected
|
||||
* clock values in ns.
|
||||
**/
|
||||
static int e1000e_phc_get_syncdevicetime(ktime_t *device,
|
||||
struct system_counterval_t *system,
|
||||
void *ctx)
|
||||
{
|
||||
struct e1000_adapter *adapter = (struct e1000_adapter *)ctx;
|
||||
struct e1000_hw *hw = &adapter->hw;
|
||||
unsigned long flags;
|
||||
int i;
|
||||
u32 tsync_ctrl;
|
||||
cycle_t dev_cycles;
|
||||
cycle_t sys_cycles;
|
||||
|
||||
tsync_ctrl = er32(TSYNCTXCTL);
|
||||
tsync_ctrl |= E1000_TSYNCTXCTL_START_SYNC |
|
||||
E1000_TSYNCTXCTL_MAX_ALLOWED_DLY_MASK;
|
||||
ew32(TSYNCTXCTL, tsync_ctrl);
|
||||
for (i = 0; i < MAX_HW_WAIT_COUNT; ++i) {
|
||||
udelay(1);
|
||||
tsync_ctrl = er32(TSYNCTXCTL);
|
||||
if (tsync_ctrl & E1000_TSYNCTXCTL_SYNC_COMP)
|
||||
break;
|
||||
}
|
||||
|
||||
if (i == MAX_HW_WAIT_COUNT)
|
||||
return -ETIMEDOUT;
|
||||
|
||||
dev_cycles = er32(SYSSTMPH);
|
||||
dev_cycles <<= 32;
|
||||
dev_cycles |= er32(SYSSTMPL);
|
||||
spin_lock_irqsave(&adapter->systim_lock, flags);
|
||||
*device = ns_to_ktime(timecounter_cyc2time(&adapter->tc, dev_cycles));
|
||||
spin_unlock_irqrestore(&adapter->systim_lock, flags);
|
||||
|
||||
sys_cycles = er32(PLTSTMPH);
|
||||
sys_cycles <<= 32;
|
||||
sys_cycles |= er32(PLTSTMPL);
|
||||
*system = convert_art_to_tsc(sys_cycles);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* e1000e_phc_getsynctime - Reads the current system/device cross timestamp
|
||||
* @ptp: ptp clock structure
|
||||
* @cts: structure containing timestamp
|
||||
*
|
||||
* Read device and system (ART) clock simultaneously and return the scaled
|
||||
* clock values in ns.
|
||||
**/
|
||||
static int e1000e_phc_getcrosststamp(struct ptp_clock_info *ptp,
|
||||
struct system_device_crosststamp *xtstamp)
|
||||
{
|
||||
struct e1000_adapter *adapter = container_of(ptp, struct e1000_adapter,
|
||||
ptp_clock_info);
|
||||
|
||||
return get_device_system_crosststamp(e1000e_phc_get_syncdevicetime,
|
||||
adapter, NULL, xtstamp);
|
||||
}
|
||||
#endif/*CONFIG_E1000E_HWTS*/
|
||||
|
||||
/**
|
||||
* e1000e_phc_gettime - Reads the current time from the hardware clock
|
||||
* @ptp: ptp clock structure
|
||||
@ -236,6 +314,13 @@ void e1000e_ptp_init(struct e1000_adapter *adapter)
|
||||
break;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_E1000E_HWTS
|
||||
/* CPU must have ART and GBe must be from Sunrise Point or greater */
|
||||
if (hw->mac.type >= e1000_pch_spt && boot_cpu_has(X86_FEATURE_ART))
|
||||
adapter->ptp_clock_info.getcrosststamp =
|
||||
e1000e_phc_getcrosststamp;
|
||||
#endif/*CONFIG_E1000E_HWTS*/
|
||||
|
||||
INIT_DELAYED_WORK(&adapter->systim_overflow_work,
|
||||
e1000e_systim_overflow_work);
|
||||
|
||||
|
||||
@ -245,6 +245,10 @@
|
||||
#define E1000_SYSTIML 0x0B600 /* System time register Low - RO */
|
||||
#define E1000_SYSTIMH 0x0B604 /* System time register High - RO */
|
||||
#define E1000_TIMINCA 0x0B608 /* Increment attributes register - RW */
|
||||
#define E1000_SYSSTMPL 0x0B648 /* HH Timesync system stamp low register */
|
||||
#define E1000_SYSSTMPH 0x0B64C /* HH Timesync system stamp hi register */
|
||||
#define E1000_PLTSTMPL 0x0B640 /* HH Timesync platform stamp low register */
|
||||
#define E1000_PLTSTMPH 0x0B644 /* HH Timesync platform stamp hi register */
|
||||
#define E1000_RXMTRL 0x0B634 /* Time sync Rx EtherType and Msg Type - RW */
|
||||
#define E1000_RXUDP 0x0B638 /* Time Sync Rx UDP Port - RW */
|
||||
|
||||
|
||||
@ -22,6 +22,7 @@
|
||||
#include <linux/poll.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/timekeeping.h>
|
||||
|
||||
#include "ptp_private.h"
|
||||
|
||||
@ -120,11 +121,13 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
|
||||
struct ptp_clock_caps caps;
|
||||
struct ptp_clock_request req;
|
||||
struct ptp_sys_offset *sysoff = NULL;
|
||||
struct ptp_sys_offset_precise precise_offset;
|
||||
struct ptp_pin_desc pd;
|
||||
struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
|
||||
struct ptp_clock_info *ops = ptp->info;
|
||||
struct ptp_clock_time *pct;
|
||||
struct timespec64 ts;
|
||||
struct system_device_crosststamp xtstamp;
|
||||
int enable, err = 0;
|
||||
unsigned int i, pin_index;
|
||||
|
||||
@ -138,6 +141,7 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
|
||||
caps.n_per_out = ptp->info->n_per_out;
|
||||
caps.pps = ptp->info->pps;
|
||||
caps.n_pins = ptp->info->n_pins;
|
||||
caps.cross_timestamping = ptp->info->getcrosststamp != NULL;
|
||||
if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
|
||||
err = -EFAULT;
|
||||
break;
|
||||
@ -180,6 +184,29 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
|
||||
err = ops->enable(ops, &req, enable);
|
||||
break;
|
||||
|
||||
case PTP_SYS_OFFSET_PRECISE:
|
||||
if (!ptp->info->getcrosststamp) {
|
||||
err = -EOPNOTSUPP;
|
||||
break;
|
||||
}
|
||||
err = ptp->info->getcrosststamp(ptp->info, &xtstamp);
|
||||
if (err)
|
||||
break;
|
||||
|
||||
ts = ktime_to_timespec64(xtstamp.device);
|
||||
precise_offset.device.sec = ts.tv_sec;
|
||||
precise_offset.device.nsec = ts.tv_nsec;
|
||||
ts = ktime_to_timespec64(xtstamp.sys_realtime);
|
||||
precise_offset.sys_realtime.sec = ts.tv_sec;
|
||||
precise_offset.sys_realtime.nsec = ts.tv_nsec;
|
||||
ts = ktime_to_timespec64(xtstamp.sys_monoraw);
|
||||
precise_offset.sys_monoraw.sec = ts.tv_sec;
|
||||
precise_offset.sys_monoraw.nsec = ts.tv_nsec;
|
||||
if (copy_to_user((void __user *)arg, &precise_offset,
|
||||
sizeof(precise_offset)))
|
||||
err = -EFAULT;
|
||||
break;
|
||||
|
||||
case PTP_SYS_OFFSET:
|
||||
sysoff = kmalloc(sizeof(*sysoff), GFP_KERNEL);
|
||||
if (!sysoff) {
|
||||
|
||||
@ -190,9 +190,9 @@ extern void clockevents_config_and_register(struct clock_event_device *dev,
|
||||
extern int clockevents_update_freq(struct clock_event_device *ce, u32 freq);
|
||||
|
||||
static inline void
|
||||
clockevents_calc_mult_shift(struct clock_event_device *ce, u32 freq, u32 minsec)
|
||||
clockevents_calc_mult_shift(struct clock_event_device *ce, u32 freq, u32 maxsec)
|
||||
{
|
||||
return clocks_calc_mult_shift(&ce->mult, &ce->shift, NSEC_PER_SEC, freq, minsec);
|
||||
return clocks_calc_mult_shift(&ce->mult, &ce->shift, NSEC_PER_SEC, freq, maxsec);
|
||||
}
|
||||
|
||||
extern void clockevents_suspend(void);
|
||||
|
||||
@ -118,6 +118,23 @@ struct clocksource {
|
||||
/* simplify initialization of mask field */
|
||||
#define CLOCKSOURCE_MASK(bits) (cycle_t)((bits) < 64 ? ((1ULL<<(bits))-1) : -1)
|
||||
|
||||
static inline u32 clocksource_freq2mult(u32 freq, u32 shift_constant, u64 from)
|
||||
{
|
||||
/* freq = cyc/from
|
||||
* mult/2^shift = ns/cyc
|
||||
* mult = ns/cyc * 2^shift
|
||||
* mult = from/freq * 2^shift
|
||||
* mult = from * 2^shift / freq
|
||||
* mult = (from<<shift) / freq
|
||||
*/
|
||||
u64 tmp = ((u64)from) << shift_constant;
|
||||
|
||||
tmp += freq/2; /* round for do_div */
|
||||
do_div(tmp, freq);
|
||||
|
||||
return (u32)tmp;
|
||||
}
|
||||
|
||||
/**
|
||||
* clocksource_khz2mult - calculates mult from khz and shift
|
||||
* @khz: Clocksource frequency in KHz
|
||||
@ -128,19 +145,7 @@ struct clocksource {
|
||||
*/
|
||||
static inline u32 clocksource_khz2mult(u32 khz, u32 shift_constant)
|
||||
{
|
||||
/* khz = cyc/(Million ns)
|
||||
* mult/2^shift = ns/cyc
|
||||
* mult = ns/cyc * 2^shift
|
||||
* mult = 1Million/khz * 2^shift
|
||||
* mult = 1000000 * 2^shift / khz
|
||||
* mult = (1000000<<shift) / khz
|
||||
*/
|
||||
u64 tmp = ((u64)1000000) << shift_constant;
|
||||
|
||||
tmp += khz/2; /* round for do_div */
|
||||
do_div(tmp, khz);
|
||||
|
||||
return (u32)tmp;
|
||||
return clocksource_freq2mult(khz, shift_constant, NSEC_PER_MSEC);
|
||||
}
|
||||
|
||||
/**
|
||||
@ -154,19 +159,7 @@ static inline u32 clocksource_khz2mult(u32 khz, u32 shift_constant)
|
||||
*/
|
||||
static inline u32 clocksource_hz2mult(u32 hz, u32 shift_constant)
|
||||
{
|
||||
/* hz = cyc/(Billion ns)
|
||||
* mult/2^shift = ns/cyc
|
||||
* mult = ns/cyc * 2^shift
|
||||
* mult = 1Billion/hz * 2^shift
|
||||
* mult = 1000000000 * 2^shift / hz
|
||||
* mult = (1000000000<<shift) / hz
|
||||
*/
|
||||
u64 tmp = ((u64)1000000000) << shift_constant;
|
||||
|
||||
tmp += hz/2; /* round for do_div */
|
||||
do_div(tmp, hz);
|
||||
|
||||
return (u32)tmp;
|
||||
return clocksource_freq2mult(hz, shift_constant, NSEC_PER_SEC);
|
||||
}
|
||||
|
||||
/**
|
||||
|
||||
@ -111,22 +111,17 @@ static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
|
||||
kt->nsec = ts.tv_nsec;
|
||||
}
|
||||
|
||||
static inline void pps_get_ts(struct pps_event_time *ts)
|
||||
{
|
||||
struct system_time_snapshot snap;
|
||||
|
||||
ktime_get_snapshot(&snap);
|
||||
ts->ts_real = ktime_to_timespec64(snap.real);
|
||||
#ifdef CONFIG_NTP_PPS
|
||||
|
||||
static inline void pps_get_ts(struct pps_event_time *ts)
|
||||
{
|
||||
ktime_get_raw_and_real_ts64(&ts->ts_raw, &ts->ts_real);
|
||||
ts->ts_raw = ktime_to_timespec64(snap.raw);
|
||||
#endif
|
||||
}
|
||||
|
||||
#else /* CONFIG_NTP_PPS */
|
||||
|
||||
static inline void pps_get_ts(struct pps_event_time *ts)
|
||||
{
|
||||
ktime_get_real_ts64(&ts->ts_real);
|
||||
}
|
||||
|
||||
#endif /* CONFIG_NTP_PPS */
|
||||
|
||||
/* Subtract known time delay from PPS event time(s) */
|
||||
static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec64 delta)
|
||||
{
|
||||
|
||||
@ -38,6 +38,7 @@ struct ptp_clock_request {
|
||||
};
|
||||
};
|
||||
|
||||
struct system_device_crosststamp;
|
||||
/**
|
||||
* struct ptp_clock_info - decribes a PTP hardware clock
|
||||
*
|
||||
@ -67,6 +68,11 @@ struct ptp_clock_request {
|
||||
* @gettime64: Reads the current time from the hardware clock.
|
||||
* parameter ts: Holds the result.
|
||||
*
|
||||
* @getcrosststamp: Reads the current time from the hardware clock and
|
||||
* system clock simultaneously.
|
||||
* parameter cts: Contains timestamp (device,system) pair,
|
||||
* where system time is realtime and monotonic.
|
||||
*
|
||||
* @settime64: Set the current time on the hardware clock.
|
||||
* parameter ts: Time value to set.
|
||||
*
|
||||
@ -105,6 +111,8 @@ struct ptp_clock_info {
|
||||
int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta);
|
||||
int (*adjtime)(struct ptp_clock_info *ptp, s64 delta);
|
||||
int (*gettime64)(struct ptp_clock_info *ptp, struct timespec64 *ts);
|
||||
int (*getcrosststamp)(struct ptp_clock_info *ptp,
|
||||
struct system_device_crosststamp *cts);
|
||||
int (*settime64)(struct ptp_clock_info *p, const struct timespec64 *ts);
|
||||
int (*enable)(struct ptp_clock_info *ptp,
|
||||
struct ptp_clock_request *request, int on);
|
||||
|
||||
@ -50,6 +50,7 @@ struct tk_read_base {
|
||||
* @offs_tai: Offset clock monotonic -> clock tai
|
||||
* @tai_offset: The current UTC to TAI offset in seconds
|
||||
* @clock_was_set_seq: The sequence number of clock was set events
|
||||
* @cs_was_changed_seq: The sequence number of clocksource change events
|
||||
* @next_leap_ktime: CLOCK_MONOTONIC time value of a pending leap-second
|
||||
* @raw_time: Monotonic raw base time in timespec64 format
|
||||
* @cycle_interval: Number of clock cycles in one NTP interval
|
||||
@ -91,6 +92,7 @@ struct timekeeper {
|
||||
ktime_t offs_tai;
|
||||
s32 tai_offset;
|
||||
unsigned int clock_was_set_seq;
|
||||
u8 cs_was_changed_seq;
|
||||
ktime_t next_leap_ktime;
|
||||
struct timespec64 raw_time;
|
||||
|
||||
|
||||
@ -266,6 +266,64 @@ extern void timekeeping_inject_sleeptime64(struct timespec64 *delta);
|
||||
extern void ktime_get_raw_and_real_ts64(struct timespec64 *ts_raw,
|
||||
struct timespec64 *ts_real);
|
||||
|
||||
/*
|
||||
* struct system_time_snapshot - simultaneous raw/real time capture with
|
||||
* counter value
|
||||
* @cycles: Clocksource counter value to produce the system times
|
||||
* @real: Realtime system time
|
||||
* @raw: Monotonic raw system time
|
||||
* @clock_was_set_seq: The sequence number of clock was set events
|
||||
* @cs_was_changed_seq: The sequence number of clocksource change events
|
||||
*/
|
||||
struct system_time_snapshot {
|
||||
cycle_t cycles;
|
||||
ktime_t real;
|
||||
ktime_t raw;
|
||||
unsigned int clock_was_set_seq;
|
||||
u8 cs_was_changed_seq;
|
||||
};
|
||||
|
||||
/*
|
||||
* struct system_device_crosststamp - system/device cross-timestamp
|
||||
* (syncronized capture)
|
||||
* @device: Device time
|
||||
* @sys_realtime: Realtime simultaneous with device time
|
||||
* @sys_monoraw: Monotonic raw simultaneous with device time
|
||||
*/
|
||||
struct system_device_crosststamp {
|
||||
ktime_t device;
|
||||
ktime_t sys_realtime;
|
||||
ktime_t sys_monoraw;
|
||||
};
|
||||
|
||||
/*
|
||||
* struct system_counterval_t - system counter value with the pointer to the
|
||||
* corresponding clocksource
|
||||
* @cycles: System counter value
|
||||
* @cs: Clocksource corresponding to system counter value. Used by
|
||||
* timekeeping code to verify comparibility of two cycle values
|
||||
*/
|
||||
struct system_counterval_t {
|
||||
cycle_t cycles;
|
||||
struct clocksource *cs;
|
||||
};
|
||||
|
||||
/*
|
||||
* Get cross timestamp between system clock and device clock
|
||||
*/
|
||||
extern int get_device_system_crosststamp(
|
||||
int (*get_time_fn)(ktime_t *device_time,
|
||||
struct system_counterval_t *system_counterval,
|
||||
void *ctx),
|
||||
void *ctx,
|
||||
struct system_time_snapshot *history,
|
||||
struct system_device_crosststamp *xtstamp);
|
||||
|
||||
/*
|
||||
* Simultaneously snapshot realtime and monotonic raw clocks
|
||||
*/
|
||||
extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot);
|
||||
|
||||
/*
|
||||
* Persistent clock related interfaces
|
||||
*/
|
||||
|
||||
@ -51,7 +51,9 @@ struct ptp_clock_caps {
|
||||
int n_per_out; /* Number of programmable periodic signals. */
|
||||
int pps; /* Whether the clock supports a PPS callback. */
|
||||
int n_pins; /* Number of input/output pins. */
|
||||
int rsv[14]; /* Reserved for future use. */
|
||||
/* Whether the clock supports precise system-device cross timestamps */
|
||||
int cross_timestamping;
|
||||
int rsv[13]; /* Reserved for future use. */
|
||||
};
|
||||
|
||||
struct ptp_extts_request {
|
||||
@ -81,6 +83,13 @@ struct ptp_sys_offset {
|
||||
struct ptp_clock_time ts[2 * PTP_MAX_SAMPLES + 1];
|
||||
};
|
||||
|
||||
struct ptp_sys_offset_precise {
|
||||
struct ptp_clock_time device;
|
||||
struct ptp_clock_time sys_realtime;
|
||||
struct ptp_clock_time sys_monoraw;
|
||||
unsigned int rsv[4]; /* Reserved for future use. */
|
||||
};
|
||||
|
||||
enum ptp_pin_function {
|
||||
PTP_PF_NONE,
|
||||
PTP_PF_EXTTS,
|
||||
@ -124,6 +133,8 @@ struct ptp_pin_desc {
|
||||
#define PTP_SYS_OFFSET _IOW(PTP_CLK_MAGIC, 5, struct ptp_sys_offset)
|
||||
#define PTP_PIN_GETFUNC _IOWR(PTP_CLK_MAGIC, 6, struct ptp_pin_desc)
|
||||
#define PTP_PIN_SETFUNC _IOW(PTP_CLK_MAGIC, 7, struct ptp_pin_desc)
|
||||
#define PTP_SYS_OFFSET_PRECISE \
|
||||
_IOWR(PTP_CLK_MAGIC, 8, struct ptp_sys_offset_precise)
|
||||
|
||||
struct ptp_extts_event {
|
||||
struct ptp_clock_time t; /* Time event occured. */
|
||||
|
||||
@ -323,13 +323,42 @@ static void clocksource_enqueue_watchdog(struct clocksource *cs)
|
||||
/* cs is a watchdog. */
|
||||
if (cs->flags & CLOCK_SOURCE_IS_CONTINUOUS)
|
||||
cs->flags |= CLOCK_SOURCE_VALID_FOR_HRES;
|
||||
/* Pick the best watchdog. */
|
||||
if (!watchdog || cs->rating > watchdog->rating) {
|
||||
watchdog = cs;
|
||||
/* Reset watchdog cycles */
|
||||
clocksource_reset_watchdog();
|
||||
}
|
||||
}
|
||||
spin_unlock_irqrestore(&watchdog_lock, flags);
|
||||
}
|
||||
|
||||
static void clocksource_select_watchdog(bool fallback)
|
||||
{
|
||||
struct clocksource *cs, *old_wd;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&watchdog_lock, flags);
|
||||
/* save current watchdog */
|
||||
old_wd = watchdog;
|
||||
if (fallback)
|
||||
watchdog = NULL;
|
||||
|
||||
list_for_each_entry(cs, &clocksource_list, list) {
|
||||
/* cs is a clocksource to be watched. */
|
||||
if (cs->flags & CLOCK_SOURCE_MUST_VERIFY)
|
||||
continue;
|
||||
|
||||
/* Skip current if we were requested for a fallback. */
|
||||
if (fallback && cs == old_wd)
|
||||
continue;
|
||||
|
||||
/* Pick the best watchdog. */
|
||||
if (!watchdog || cs->rating > watchdog->rating)
|
||||
watchdog = cs;
|
||||
}
|
||||
/* If we failed to find a fallback restore the old one. */
|
||||
if (!watchdog)
|
||||
watchdog = old_wd;
|
||||
|
||||
/* If we changed the watchdog we need to reset cycles. */
|
||||
if (watchdog != old_wd)
|
||||
clocksource_reset_watchdog();
|
||||
|
||||
/* Check if the watchdog timer needs to be started. */
|
||||
clocksource_start_watchdog();
|
||||
spin_unlock_irqrestore(&watchdog_lock, flags);
|
||||
@ -404,6 +433,7 @@ static void clocksource_enqueue_watchdog(struct clocksource *cs)
|
||||
cs->flags |= CLOCK_SOURCE_VALID_FOR_HRES;
|
||||
}
|
||||
|
||||
static void clocksource_select_watchdog(bool fallback) { }
|
||||
static inline void clocksource_dequeue_watchdog(struct clocksource *cs) { }
|
||||
static inline void clocksource_resume_watchdog(void) { }
|
||||
static inline int __clocksource_watchdog_kthread(void) { return 0; }
|
||||
@ -736,6 +766,7 @@ int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
|
||||
clocksource_enqueue(cs);
|
||||
clocksource_enqueue_watchdog(cs);
|
||||
clocksource_select();
|
||||
clocksource_select_watchdog(false);
|
||||
mutex_unlock(&clocksource_mutex);
|
||||
return 0;
|
||||
}
|
||||
@ -758,6 +789,7 @@ void clocksource_change_rating(struct clocksource *cs, int rating)
|
||||
mutex_lock(&clocksource_mutex);
|
||||
__clocksource_change_rating(cs, rating);
|
||||
clocksource_select();
|
||||
clocksource_select_watchdog(false);
|
||||
mutex_unlock(&clocksource_mutex);
|
||||
}
|
||||
EXPORT_SYMBOL(clocksource_change_rating);
|
||||
@ -767,12 +799,12 @@ EXPORT_SYMBOL(clocksource_change_rating);
|
||||
*/
|
||||
static int clocksource_unbind(struct clocksource *cs)
|
||||
{
|
||||
/*
|
||||
* I really can't convince myself to support this on hardware
|
||||
* designed by lobotomized monkeys.
|
||||
*/
|
||||
if (clocksource_is_watchdog(cs))
|
||||
return -EBUSY;
|
||||
if (clocksource_is_watchdog(cs)) {
|
||||
/* Select and try to install a replacement watchdog. */
|
||||
clocksource_select_watchdog(true);
|
||||
if (clocksource_is_watchdog(cs))
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
if (cs == curr_clocksource) {
|
||||
/* Select and try to install a replacement clock source */
|
||||
|
||||
@ -68,7 +68,7 @@ static struct clocksource clocksource_jiffies = {
|
||||
.name = "jiffies",
|
||||
.rating = 1, /* lowest valid rating*/
|
||||
.read = jiffies_read,
|
||||
.mask = 0xffffffff, /*32bits*/
|
||||
.mask = CLOCKSOURCE_MASK(32),
|
||||
.mult = NSEC_PER_JIFFY << JIFFIES_SHIFT, /* details above */
|
||||
.shift = JIFFIES_SHIFT,
|
||||
.max_cycles = 10,
|
||||
|
||||
@ -233,6 +233,7 @@ static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock)
|
||||
u64 tmp, ntpinterval;
|
||||
struct clocksource *old_clock;
|
||||
|
||||
++tk->cs_was_changed_seq;
|
||||
old_clock = tk->tkr_mono.clock;
|
||||
tk->tkr_mono.clock = clock;
|
||||
tk->tkr_mono.read = clock->read;
|
||||
@ -298,19 +299,36 @@ u32 (*arch_gettimeoffset)(void) = default_arch_gettimeoffset;
|
||||
static inline u32 arch_gettimeoffset(void) { return 0; }
|
||||
#endif
|
||||
|
||||
static inline s64 timekeeping_get_ns(struct tk_read_base *tkr)
|
||||
static inline s64 timekeeping_delta_to_ns(struct tk_read_base *tkr,
|
||||
cycle_t delta)
|
||||
{
|
||||
cycle_t delta;
|
||||
s64 nsec;
|
||||
|
||||
delta = timekeeping_get_delta(tkr);
|
||||
|
||||
nsec = (delta * tkr->mult + tkr->xtime_nsec) >> tkr->shift;
|
||||
nsec = delta * tkr->mult + tkr->xtime_nsec;
|
||||
nsec >>= tkr->shift;
|
||||
|
||||
/* If arch requires, add in get_arch_timeoffset() */
|
||||
return nsec + arch_gettimeoffset();
|
||||
}
|
||||
|
||||
static inline s64 timekeeping_get_ns(struct tk_read_base *tkr)
|
||||
{
|
||||
cycle_t delta;
|
||||
|
||||
delta = timekeeping_get_delta(tkr);
|
||||
return timekeeping_delta_to_ns(tkr, delta);
|
||||
}
|
||||
|
||||
static inline s64 timekeeping_cycles_to_ns(struct tk_read_base *tkr,
|
||||
cycle_t cycles)
|
||||
{
|
||||
cycle_t delta;
|
||||
|
||||
/* calculate the delta since the last update_wall_time */
|
||||
delta = clocksource_delta(cycles, tkr->cycle_last, tkr->mask);
|
||||
return timekeeping_delta_to_ns(tkr, delta);
|
||||
}
|
||||
|
||||
/**
|
||||
* update_fast_timekeeper - Update the fast and NMI safe monotonic timekeeper.
|
||||
* @tkr: Timekeeping readout base from which we take the update
|
||||
@ -857,44 +875,262 @@ time64_t __ktime_get_real_seconds(void)
|
||||
return tk->xtime_sec;
|
||||
}
|
||||
|
||||
|
||||
#ifdef CONFIG_NTP_PPS
|
||||
|
||||
/**
|
||||
* ktime_get_raw_and_real_ts64 - get day and raw monotonic time in timespec format
|
||||
* @ts_raw: pointer to the timespec to be set to raw monotonic time
|
||||
* @ts_real: pointer to the timespec to be set to the time of day
|
||||
*
|
||||
* This function reads both the time of day and raw monotonic time at the
|
||||
* same time atomically and stores the resulting timestamps in timespec
|
||||
* format.
|
||||
* ktime_get_snapshot - snapshots the realtime/monotonic raw clocks with counter
|
||||
* @systime_snapshot: pointer to struct receiving the system time snapshot
|
||||
*/
|
||||
void ktime_get_raw_and_real_ts64(struct timespec64 *ts_raw, struct timespec64 *ts_real)
|
||||
void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot)
|
||||
{
|
||||
struct timekeeper *tk = &tk_core.timekeeper;
|
||||
unsigned long seq;
|
||||
s64 nsecs_raw, nsecs_real;
|
||||
ktime_t base_raw;
|
||||
ktime_t base_real;
|
||||
s64 nsec_raw;
|
||||
s64 nsec_real;
|
||||
cycle_t now;
|
||||
|
||||
WARN_ON_ONCE(timekeeping_suspended);
|
||||
|
||||
do {
|
||||
seq = read_seqcount_begin(&tk_core.seq);
|
||||
|
||||
*ts_raw = tk->raw_time;
|
||||
ts_real->tv_sec = tk->xtime_sec;
|
||||
ts_real->tv_nsec = 0;
|
||||
|
||||
nsecs_raw = timekeeping_get_ns(&tk->tkr_raw);
|
||||
nsecs_real = timekeeping_get_ns(&tk->tkr_mono);
|
||||
|
||||
now = tk->tkr_mono.read(tk->tkr_mono.clock);
|
||||
systime_snapshot->cs_was_changed_seq = tk->cs_was_changed_seq;
|
||||
systime_snapshot->clock_was_set_seq = tk->clock_was_set_seq;
|
||||
base_real = ktime_add(tk->tkr_mono.base,
|
||||
tk_core.timekeeper.offs_real);
|
||||
base_raw = tk->tkr_raw.base;
|
||||
nsec_real = timekeeping_cycles_to_ns(&tk->tkr_mono, now);
|
||||
nsec_raw = timekeeping_cycles_to_ns(&tk->tkr_raw, now);
|
||||
} while (read_seqcount_retry(&tk_core.seq, seq));
|
||||
|
||||
timespec64_add_ns(ts_raw, nsecs_raw);
|
||||
timespec64_add_ns(ts_real, nsecs_real);
|
||||
systime_snapshot->cycles = now;
|
||||
systime_snapshot->real = ktime_add_ns(base_real, nsec_real);
|
||||
systime_snapshot->raw = ktime_add_ns(base_raw, nsec_raw);
|
||||
}
|
||||
EXPORT_SYMBOL(ktime_get_raw_and_real_ts64);
|
||||
EXPORT_SYMBOL_GPL(ktime_get_snapshot);
|
||||
|
||||
#endif /* CONFIG_NTP_PPS */
|
||||
/* Scale base by mult/div checking for overflow */
|
||||
static int scale64_check_overflow(u64 mult, u64 div, u64 *base)
|
||||
{
|
||||
u64 tmp, rem;
|
||||
|
||||
tmp = div64_u64_rem(*base, div, &rem);
|
||||
|
||||
if (((int)sizeof(u64)*8 - fls64(mult) < fls64(tmp)) ||
|
||||
((int)sizeof(u64)*8 - fls64(mult) < fls64(rem)))
|
||||
return -EOVERFLOW;
|
||||
tmp *= mult;
|
||||
rem *= mult;
|
||||
|
||||
do_div(rem, div);
|
||||
*base = tmp + rem;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* adjust_historical_crosststamp - adjust crosstimestamp previous to current interval
|
||||
* @history: Snapshot representing start of history
|
||||
* @partial_history_cycles: Cycle offset into history (fractional part)
|
||||
* @total_history_cycles: Total history length in cycles
|
||||
* @discontinuity: True indicates clock was set on history period
|
||||
* @ts: Cross timestamp that should be adjusted using
|
||||
* partial/total ratio
|
||||
*
|
||||
* Helper function used by get_device_system_crosststamp() to correct the
|
||||
* crosstimestamp corresponding to the start of the current interval to the
|
||||
* system counter value (timestamp point) provided by the driver. The
|
||||
* total_history_* quantities are the total history starting at the provided
|
||||
* reference point and ending at the start of the current interval. The cycle
|
||||
* count between the driver timestamp point and the start of the current
|
||||
* interval is partial_history_cycles.
|
||||
*/
|
||||
static int adjust_historical_crosststamp(struct system_time_snapshot *history,
|
||||
cycle_t partial_history_cycles,
|
||||
cycle_t total_history_cycles,
|
||||
bool discontinuity,
|
||||
struct system_device_crosststamp *ts)
|
||||
{
|
||||
struct timekeeper *tk = &tk_core.timekeeper;
|
||||
u64 corr_raw, corr_real;
|
||||
bool interp_forward;
|
||||
int ret;
|
||||
|
||||
if (total_history_cycles == 0 || partial_history_cycles == 0)
|
||||
return 0;
|
||||
|
||||
/* Interpolate shortest distance from beginning or end of history */
|
||||
interp_forward = partial_history_cycles > total_history_cycles/2 ?
|
||||
true : false;
|
||||
partial_history_cycles = interp_forward ?
|
||||
total_history_cycles - partial_history_cycles :
|
||||
partial_history_cycles;
|
||||
|
||||
/*
|
||||
* Scale the monotonic raw time delta by:
|
||||
* partial_history_cycles / total_history_cycles
|
||||
*/
|
||||
corr_raw = (u64)ktime_to_ns(
|
||||
ktime_sub(ts->sys_monoraw, history->raw));
|
||||
ret = scale64_check_overflow(partial_history_cycles,
|
||||
total_history_cycles, &corr_raw);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/*
|
||||
* If there is a discontinuity in the history, scale monotonic raw
|
||||
* correction by:
|
||||
* mult(real)/mult(raw) yielding the realtime correction
|
||||
* Otherwise, calculate the realtime correction similar to monotonic
|
||||
* raw calculation
|
||||
*/
|
||||
if (discontinuity) {
|
||||
corr_real = mul_u64_u32_div
|
||||
(corr_raw, tk->tkr_mono.mult, tk->tkr_raw.mult);
|
||||
} else {
|
||||
corr_real = (u64)ktime_to_ns(
|
||||
ktime_sub(ts->sys_realtime, history->real));
|
||||
ret = scale64_check_overflow(partial_history_cycles,
|
||||
total_history_cycles, &corr_real);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Fixup monotonic raw and real time time values */
|
||||
if (interp_forward) {
|
||||
ts->sys_monoraw = ktime_add_ns(history->raw, corr_raw);
|
||||
ts->sys_realtime = ktime_add_ns(history->real, corr_real);
|
||||
} else {
|
||||
ts->sys_monoraw = ktime_sub_ns(ts->sys_monoraw, corr_raw);
|
||||
ts->sys_realtime = ktime_sub_ns(ts->sys_realtime, corr_real);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* cycle_between - true if test occurs chronologically between before and after
|
||||
*/
|
||||
static bool cycle_between(cycle_t before, cycle_t test, cycle_t after)
|
||||
{
|
||||
if (test > before && test < after)
|
||||
return true;
|
||||
if (test < before && before > after)
|
||||
return true;
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* get_device_system_crosststamp - Synchronously capture system/device timestamp
|
||||
* @get_time_fn: Callback to get simultaneous device time and
|
||||
* system counter from the device driver
|
||||
* @ctx: Context passed to get_time_fn()
|
||||
* @history_begin: Historical reference point used to interpolate system
|
||||
* time when counter provided by the driver is before the current interval
|
||||
* @xtstamp: Receives simultaneously captured system and device time
|
||||
*
|
||||
* Reads a timestamp from a device and correlates it to system time
|
||||
*/
|
||||
int get_device_system_crosststamp(int (*get_time_fn)
|
||||
(ktime_t *device_time,
|
||||
struct system_counterval_t *sys_counterval,
|
||||
void *ctx),
|
||||
void *ctx,
|
||||
struct system_time_snapshot *history_begin,
|
||||
struct system_device_crosststamp *xtstamp)
|
||||
{
|
||||
struct system_counterval_t system_counterval;
|
||||
struct timekeeper *tk = &tk_core.timekeeper;
|
||||
cycle_t cycles, now, interval_start;
|
||||
unsigned int clock_was_set_seq = 0;
|
||||
ktime_t base_real, base_raw;
|
||||
s64 nsec_real, nsec_raw;
|
||||
u8 cs_was_changed_seq;
|
||||
unsigned long seq;
|
||||
bool do_interp;
|
||||
int ret;
|
||||
|
||||
do {
|
||||
seq = read_seqcount_begin(&tk_core.seq);
|
||||
/*
|
||||
* Try to synchronously capture device time and a system
|
||||
* counter value calling back into the device driver
|
||||
*/
|
||||
ret = get_time_fn(&xtstamp->device, &system_counterval, ctx);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/*
|
||||
* Verify that the clocksource associated with the captured
|
||||
* system counter value is the same as the currently installed
|
||||
* timekeeper clocksource
|
||||
*/
|
||||
if (tk->tkr_mono.clock != system_counterval.cs)
|
||||
return -ENODEV;
|
||||
cycles = system_counterval.cycles;
|
||||
|
||||
/*
|
||||
* Check whether the system counter value provided by the
|
||||
* device driver is on the current timekeeping interval.
|
||||
*/
|
||||
now = tk->tkr_mono.read(tk->tkr_mono.clock);
|
||||
interval_start = tk->tkr_mono.cycle_last;
|
||||
if (!cycle_between(interval_start, cycles, now)) {
|
||||
clock_was_set_seq = tk->clock_was_set_seq;
|
||||
cs_was_changed_seq = tk->cs_was_changed_seq;
|
||||
cycles = interval_start;
|
||||
do_interp = true;
|
||||
} else {
|
||||
do_interp = false;
|
||||
}
|
||||
|
||||
base_real = ktime_add(tk->tkr_mono.base,
|
||||
tk_core.timekeeper.offs_real);
|
||||
base_raw = tk->tkr_raw.base;
|
||||
|
||||
nsec_real = timekeeping_cycles_to_ns(&tk->tkr_mono,
|
||||
system_counterval.cycles);
|
||||
nsec_raw = timekeeping_cycles_to_ns(&tk->tkr_raw,
|
||||
system_counterval.cycles);
|
||||
} while (read_seqcount_retry(&tk_core.seq, seq));
|
||||
|
||||
xtstamp->sys_realtime = ktime_add_ns(base_real, nsec_real);
|
||||
xtstamp->sys_monoraw = ktime_add_ns(base_raw, nsec_raw);
|
||||
|
||||
/*
|
||||
* Interpolate if necessary, adjusting back from the start of the
|
||||
* current interval
|
||||
*/
|
||||
if (do_interp) {
|
||||
cycle_t partial_history_cycles, total_history_cycles;
|
||||
bool discontinuity;
|
||||
|
||||
/*
|
||||
* Check that the counter value occurs after the provided
|
||||
* history reference and that the history doesn't cross a
|
||||
* clocksource change
|
||||
*/
|
||||
if (!history_begin ||
|
||||
!cycle_between(history_begin->cycles,
|
||||
system_counterval.cycles, cycles) ||
|
||||
history_begin->cs_was_changed_seq != cs_was_changed_seq)
|
||||
return -EINVAL;
|
||||
partial_history_cycles = cycles - system_counterval.cycles;
|
||||
total_history_cycles = cycles - history_begin->cycles;
|
||||
discontinuity =
|
||||
history_begin->clock_was_set_seq != clock_was_set_seq;
|
||||
|
||||
ret = adjust_historical_crosststamp(history_begin,
|
||||
partial_history_cycles,
|
||||
total_history_cycles,
|
||||
discontinuity, xtstamp);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(get_device_system_crosststamp);
|
||||
|
||||
/**
|
||||
* do_gettimeofday - Returns the time of day in a timeval
|
||||
|
||||
Loading…
Reference in New Issue
Block a user