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From: Thomas Gleixner
Date: Tue Mar 05 2019 - 06:49:26 EST

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Linus,

please pull the latest timers-core-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers-core-for-linus

The time(r) core and clockevent updates are mostly boring this time:

- A new driver for the Tegra210 timer

- Small fixes and improvements alll over the place

- Documentation updates and cleanups

Thanks,

tglx

------------------>
Anson Huang (1):
dt-bindings: timer: gpt: update binding doc

Atish Patra (1):
clocksource/drivers/riscv: Add required checks during clock source init

Biju Das (2):
dt-bindings: timer: renesas, cmt: Document r8a774c0 CMT support
dt-bindings: timer: renesas: tmu: Document r8a774c0 bindings

Chen-Yu Tsai (1):
clocksource/drivers/sun5i: Fail gracefully when clock rate is unavailable

Daniel Lezcano (3):
clocksource/drivers/tango-xtal: Rename the file for consistency
clocksource/drivers/timer-pxa: Rename the file for consistency
clocksource/drivers/timer-cs5535: Rename the file for consistency

Greg Kroah-Hartman (1):
timekeeping/debug: No need to check return value of debugfs_create functions

Gustavo A. R. Silva (1):
timers: Mark expected switch fall-throughs

Joseph Lo (3):
dt-bindings: timer: add Tegra210 timer
clocksource/drivers/tegra: Add Tegra210 timer support
soc/tegra: default select TEGRA_TIMER for Tegra210

Krzysztof Kozlowski (1):
clocksource/drivers/exynos_mct: Remove unused header includes

Marek Szyprowski (2):
clocksource/drivers/exynos_mct: Remove dead code
clocksource/drivers/exynos_mct: Fix error path in timer resources initialization

Paul E. McKenney (1):
time: Move CONTEXT_TRACKING to kernel/time/Kconfig

Ryder Lee (1):
dt-bindings: timer: mediatek: update bindings for MT7629 SoC

Samuel Holland (1):
clocksource/drivers/arch_timer: Workaround for Allwinner A64 timer instability

Stuart Menefy (2):
clocksource/drivers/exynos_mct: Move one-shot check from tick clear to ISR
clocksource/drivers/exynos_mct: Clear timer interrupt when shutdown

Thomas Gleixner (1):
posix-cpu-timers: Remove private interval storage

Documentation/arm64/silicon-errata.txt | 2 +
.../devicetree/bindings/timer/fsl,imxgpt.txt | 39 ++-
.../bindings/timer/mediatek,mtk-timer.txt | 11 +-
.../bindings/timer/nvidia,tegra210-timer.txt | 36 ++
.../devicetree/bindings/timer/renesas,cmt.txt | 2 +
.../devicetree/bindings/timer/renesas,tmu.txt | 1 +
drivers/clocksource/Kconfig | 13 +-
drivers/clocksource/Makefile | 6 +-
drivers/clocksource/arm_arch_timer.c | 55 +++
drivers/clocksource/exynos_mct.c | 48 +--
.../{cs5535-clockevt.c => timer-cs5535.c} | 0
drivers/clocksource/{pxa_timer.c => timer-pxa.c} | 0
drivers/clocksource/timer-riscv.c | 23 +-
drivers/clocksource/timer-sun5i.c | 10 +
.../{tango_xtal.c => timer-tango-xtal.c} | 0
drivers/clocksource/timer-tegra20.c | 370 ++++++++++++++-------
drivers/soc/tegra/Kconfig | 1 +
include/linux/cpuhotplug.h | 1 +
include/linux/posix-timers.h | 2 +-
kernel/rcu/Kconfig | 30 --
kernel/time/Kconfig | 29 ++
kernel/time/hrtimer.c | 2 +-
kernel/time/posix-cpu-timers.c | 13 +-
kernel/time/tick-broadcast.c | 1 +
kernel/time/timekeeping_debug.c | 11 +-
kernel/time/timer.c | 2 +-
26 files changed, 511 insertions(+), 197 deletions(-)
create mode 100644 Documentation/devicetree/bindings/timer/nvidia,tegra210-timer.txt
rename drivers/clocksource/{cs5535-clockevt.c => timer-cs5535.c} (100%)
rename drivers/clocksource/{pxa_timer.c => timer-pxa.c} (100%)
rename drivers/clocksource/{tango_xtal.c => timer-tango-xtal.c} (100%)

diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt
index 1f09d043d086..ddb8ce5333ba 100644
--- a/Documentation/arm64/silicon-errata.txt
+++ b/Documentation/arm64/silicon-errata.txt
@@ -44,6 +44,8 @@ stable kernels.

| Implementor | Component | Erratum ID | Kconfig |
+----------------+-----------------+-----------------+-----------------------------+
+| Allwinner | A64/R18 | UNKNOWN1 | SUN50I_ERRATUM_UNKNOWN1 |
+| | | | |
| ARM | Cortex-A53 | #826319 | ARM64_ERRATUM_826319 |
| ARM | Cortex-A53 | #827319 | ARM64_ERRATUM_827319 |
| ARM | Cortex-A53 | #824069 | ARM64_ERRATUM_824069 |
diff --git a/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt b/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt
index 9809b11f7180..5d8fd5b52598 100644
--- a/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt
+++ b/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt
@@ -2,17 +2,44 @@ Freescale i.MX General Purpose Timer (GPT)

Required properties:

-- compatible : should be "fsl,<soc>-gpt"
-- reg : Specifies base physical address and size of the registers.
-- interrupts : A list of 4 interrupts; one per timer channel.
-- clocks : The clocks provided by the SoC to drive the timer.
+- compatible : should be one of following:
+ for i.MX1:
+ - "fsl,imx1-gpt";
+ for i.MX21:
+ - "fsl,imx21-gpt";
+ for i.MX27:
+ - "fsl,imx27-gpt", "fsl,imx21-gpt";
+ for i.MX31:
+ - "fsl,imx31-gpt";
+ for i.MX25:
+ - "fsl,imx25-gpt", "fsl,imx31-gpt";
+ for i.MX50:
+ - "fsl,imx50-gpt", "fsl,imx31-gpt";
+ for i.MX51:
+ - "fsl,imx51-gpt", "fsl,imx31-gpt";
+ for i.MX53:
+ - "fsl,imx53-gpt", "fsl,imx31-gpt";
+ for i.MX6Q:
+ - "fsl,imx6q-gpt", "fsl,imx31-gpt";
+ for i.MX6DL:
+ - "fsl,imx6dl-gpt";
+ for i.MX6SL:
+ - "fsl,imx6sl-gpt", "fsl,imx6dl-gpt";
+ for i.MX6SX:
+ - "fsl,imx6sx-gpt", "fsl,imx6dl-gpt";
+- reg : specifies base physical address and size of the registers.
+- interrupts : should be the gpt interrupt.
+- clocks : the clocks provided by the SoC to drive the timer, must contain
+ an entry for each entry in clock-names.
+- clock-names : must include "ipg" entry first, then "per" entry.

Example:

gpt1: timer@10003000 {
- compatible = "fsl,imx27-gpt", "fsl,imx1-gpt";
+ compatible = "fsl,imx27-gpt", "fsl,imx21-gpt";
reg = <0x10003000 0x1000>;
interrupts = <26>;
- clocks = <&clks 46>, <&clks 61>;
+ clocks = <&clks IMX27_CLK_GPT1_IPG_GATE>,
+ <&clks IMX27_CLK_PER1_GATE>;
clock-names = "ipg", "per";
};
diff --git a/Documentation/devicetree/bindings/timer/mediatek,mtk-timer.txt b/Documentation/devicetree/bindings/timer/mediatek,mtk-timer.txt
index 18d4d0166c76..ff7c567a7972 100644
--- a/Documentation/devicetree/bindings/timer/mediatek,mtk-timer.txt
+++ b/Documentation/devicetree/bindings/timer/mediatek,mtk-timer.txt
@@ -1,7 +1,7 @@
-Mediatek Timers
+MediaTek Timers
---------------

-Mediatek SoCs have two different timers on different platforms,
+MediaTek SoCs have two different timers on different platforms,
- GPT (General Purpose Timer)
- SYST (System Timer)

@@ -9,6 +9,7 @@ The proper timer will be selected automatically by driver.

Required properties:
- compatible should contain:
+ For those SoCs that use GPT
* "mediatek,mt2701-timer" for MT2701 compatible timers (GPT)
* "mediatek,mt6580-timer" for MT6580 compatible timers (GPT)
* "mediatek,mt6589-timer" for MT6589 compatible timers (GPT)
@@ -17,7 +18,11 @@ Required properties:
* "mediatek,mt8135-timer" for MT8135 compatible timers (GPT)
* "mediatek,mt8173-timer" for MT8173 compatible timers (GPT)
* "mediatek,mt6577-timer" for MT6577 and all above compatible timers (GPT)
- * "mediatek,mt6765-timer" for MT6765 compatible timers (SYST)
+
+ For those SoCs that use SYST
+ * "mediatek,mt7629-timer" for MT7629 compatible timers (SYST)
+ * "mediatek,mt6765-timer" for MT6765 and all above compatible timers (SYST)
+
- reg: Should contain location and length for timer register.
- clocks: Should contain system clock.

diff --git a/Documentation/devicetree/bindings/timer/nvidia,tegra210-timer.txt b/Documentation/devicetree/bindings/timer/nvidia,tegra210-timer.txt
new file mode 100644
index 000000000000..032cda96fe0d
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/nvidia,tegra210-timer.txt
@@ -0,0 +1,36 @@
+NVIDIA Tegra210 timer
+
+The Tegra210 timer provides fourteen 29-bit timer counters and one 32-bit
+timestamp counter. The TMRs run at either a fixed 1 MHz clock rate derived
+from the oscillator clock (TMR0-TMR9) or directly at the oscillator clock
+(TMR10-TMR13). Each TMR can be programmed to generate one-shot, periodic,
+or watchdog interrupts.
+
+Required properties:
+- compatible : "nvidia,tegra210-timer".
+- reg : Specifies base physical address and size of the registers.
+- interrupts : A list of 14 interrupts; one per each timer channels 0 through
+ 13.
+- clocks : Must contain one entry, for the module clock.
+ See ../clocks/clock-bindings.txt for details.
+
+timer@60005000 {
+ compatible = "nvidia,tegra210-timer";
+ reg = <0x0 0x60005000 0x0 0x400>;
+ interrupts = <GIC_SPI 156 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 121 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 152 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 153 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 154 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 155 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 177 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 178 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 179 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&tegra_car TEGRA210_CLK_TIMER>;
+ clock-names = "timer";
+};
diff --git a/Documentation/devicetree/bindings/timer/renesas,cmt.txt b/Documentation/devicetree/bindings/timer/renesas,cmt.txt
index 862a80f0380a..c0594450e9ef 100644
--- a/Documentation/devicetree/bindings/timer/renesas,cmt.txt
+++ b/Documentation/devicetree/bindings/timer/renesas,cmt.txt
@@ -32,6 +32,8 @@ Required Properties:
- "renesas,r8a77470-cmt1" for the 48-bit CMT1 device included in r8a77470.
- "renesas,r8a774a1-cmt0" for the 32-bit CMT0 device included in r8a774a1.
- "renesas,r8a774a1-cmt1" for the 48-bit CMT1 device included in r8a774a1.
+ - "renesas,r8a774c0-cmt0" for the 32-bit CMT0 device included in r8a774c0.
+ - "renesas,r8a774c0-cmt1" for the 48-bit CMT1 device included in r8a774c0.
- "renesas,r8a7790-cmt0" for the 32-bit CMT0 device included in r8a7790.
- "renesas,r8a7790-cmt1" for the 48-bit CMT1 device included in r8a7790.
- "renesas,r8a7791-cmt0" for the 32-bit CMT0 device included in r8a7791.
diff --git a/Documentation/devicetree/bindings/timer/renesas,tmu.txt b/Documentation/devicetree/bindings/timer/renesas,tmu.txt
index 4ddff85837da..13ad07416bdd 100644
--- a/Documentation/devicetree/bindings/timer/renesas,tmu.txt
+++ b/Documentation/devicetree/bindings/timer/renesas,tmu.txt
@@ -10,6 +10,7 @@ Required Properties:

- compatible: must contain one or more of the following:
- "renesas,tmu-r8a7740" for the r8a7740 TMU
+ - "renesas,tmu-r8a774c0" for the r8a774C0 TMU
- "renesas,tmu-r8a7778" for the r8a7778 TMU
- "renesas,tmu-r8a7779" for the r8a7779 TMU
- "renesas,tmu-r8a77970" for the r8a77970 TMU
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index a9e26f6a81a1..5d93e580e5dc 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -131,7 +131,8 @@ config SUN5I_HSTIMER
config TEGRA_TIMER
bool "Tegra timer driver" if COMPILE_TEST
select CLKSRC_MMIO
- depends on ARM
+ select TIMER_OF
+ depends on ARM || ARM64
help
Enables support for the Tegra driver.

@@ -360,6 +361,16 @@ config ARM64_ERRATUM_858921
The workaround will be dynamically enabled when an affected
core is detected.

+config SUN50I_ERRATUM_UNKNOWN1
+ bool "Workaround for Allwinner A64 erratum UNKNOWN1"
+ default y
+ depends on ARM_ARCH_TIMER && ARM64 && ARCH_SUNXI
+ select ARM_ARCH_TIMER_OOL_WORKAROUND
+ help
+ This option enables a workaround for instability in the timer on
+ the Allwinner A64 SoC. The workaround will only be active if the
+ allwinner,erratum-unknown1 property is found in the timer node.
+
config ARM_GLOBAL_TIMER
bool "Support for the ARM global timer" if COMPILE_TEST
select TIMER_OF if OF
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index cdd210ff89ea..c4a8e9ef932a 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -6,7 +6,7 @@ obj-$(CONFIG_ATMEL_ST) += timer-atmel-st.o
obj-$(CONFIG_ATMEL_TCB_CLKSRC) += tcb_clksrc.o
obj-$(CONFIG_X86_PM_TIMER) += acpi_pm.o
obj-$(CONFIG_SCx200HR_TIMER) += scx200_hrt.o
-obj-$(CONFIG_CS5535_CLOCK_EVENT_SRC) += cs5535-clockevt.o
+obj-$(CONFIG_CS5535_CLOCK_EVENT_SRC) += timer-cs5535.o
obj-$(CONFIG_CLKSRC_JCORE_PIT) += jcore-pit.o
obj-$(CONFIG_SH_TIMER_CMT) += sh_cmt.o
obj-$(CONFIG_SH_TIMER_MTU2) += sh_mtu2.o
@@ -29,7 +29,7 @@ obj-$(CONFIG_BCM2835_TIMER) += bcm2835_timer.o
obj-$(CONFIG_CLPS711X_TIMER) += clps711x-timer.o
obj-$(CONFIG_ATLAS7_TIMER) += timer-atlas7.o
obj-$(CONFIG_MXS_TIMER) += mxs_timer.o
-obj-$(CONFIG_CLKSRC_PXA) += pxa_timer.o
+obj-$(CONFIG_CLKSRC_PXA) += timer-pxa.o
obj-$(CONFIG_PRIMA2_TIMER) += timer-prima2.o
obj-$(CONFIG_U300_TIMER) += timer-u300.o
obj-$(CONFIG_SUN4I_TIMER) += timer-sun4i.o
@@ -69,7 +69,7 @@ obj-$(CONFIG_KEYSTONE_TIMER) += timer-keystone.o
obj-$(CONFIG_INTEGRATOR_AP_TIMER) += timer-integrator-ap.o
obj-$(CONFIG_CLKSRC_VERSATILE) += timer-versatile.o
obj-$(CONFIG_CLKSRC_MIPS_GIC) += mips-gic-timer.o
-obj-$(CONFIG_CLKSRC_TANGO_XTAL) += tango_xtal.o
+obj-$(CONFIG_CLKSRC_TANGO_XTAL) += timer-tango-xtal.o
obj-$(CONFIG_CLKSRC_IMX_GPT) += timer-imx-gpt.o
obj-$(CONFIG_CLKSRC_IMX_TPM) += timer-imx-tpm.o
obj-$(CONFIG_ASM9260_TIMER) += asm9260_timer.o
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 9a7d4dc00b6e..a8b20b65bd4b 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -326,6 +326,48 @@ static u64 notrace arm64_1188873_read_cntvct_el0(void)
}
#endif

+#ifdef CONFIG_SUN50I_ERRATUM_UNKNOWN1
+/*
+ * The low bits of the counter registers are indeterminate while bit 10 or
+ * greater is rolling over. Since the counter value can jump both backward
+ * (7ff -> 000 -> 800) and forward (7ff -> fff -> 800), ignore register values
+ * with all ones or all zeros in the low bits. Bound the loop by the maximum
+ * number of CPU cycles in 3 consecutive 24 MHz counter periods.
+ */
+#define __sun50i_a64_read_reg(reg) ({ \
+ u64 _val; \
+ int _retries = 150; \
+ \
+ do { \
+ _val = read_sysreg(reg); \
+ _retries--; \
+ } while (((_val + 1) & GENMASK(9, 0)) <= 1 && _retries); \
+ \
+ WARN_ON_ONCE(!_retries); \
+ _val; \
+})
+
+static u64 notrace sun50i_a64_read_cntpct_el0(void)
+{
+ return __sun50i_a64_read_reg(cntpct_el0);
+}
+
+static u64 notrace sun50i_a64_read_cntvct_el0(void)
+{
+ return __sun50i_a64_read_reg(cntvct_el0);
+}
+
+static u32 notrace sun50i_a64_read_cntp_tval_el0(void)
+{
+ return read_sysreg(cntp_cval_el0) - sun50i_a64_read_cntpct_el0();
+}
+
+static u32 notrace sun50i_a64_read_cntv_tval_el0(void)
+{
+ return read_sysreg(cntv_cval_el0) - sun50i_a64_read_cntvct_el0();
+}
+#endif
+
#ifdef CONFIG_ARM_ARCH_TIMER_OOL_WORKAROUND
DEFINE_PER_CPU(const struct arch_timer_erratum_workaround *, timer_unstable_counter_workaround);
EXPORT_SYMBOL_GPL(timer_unstable_counter_workaround);
@@ -423,6 +465,19 @@ static const struct arch_timer_erratum_workaround ool_workarounds[] = {
.read_cntvct_el0 = arm64_1188873_read_cntvct_el0,
},
#endif
+#ifdef CONFIG_SUN50I_ERRATUM_UNKNOWN1
+ {
+ .match_type = ate_match_dt,
+ .id = "allwinner,erratum-unknown1",
+ .desc = "Allwinner erratum UNKNOWN1",
+ .read_cntp_tval_el0 = sun50i_a64_read_cntp_tval_el0,
+ .read_cntv_tval_el0 = sun50i_a64_read_cntv_tval_el0,
+ .read_cntpct_el0 = sun50i_a64_read_cntpct_el0,
+ .read_cntvct_el0 = sun50i_a64_read_cntvct_el0,
+ .set_next_event_phys = erratum_set_next_event_tval_phys,
+ .set_next_event_virt = erratum_set_next_event_tval_virt,
+ },
+#endif
};

typedef bool (*ate_match_fn_t)(const struct arch_timer_erratum_workaround *,
diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 7a244b681876..34bd250d46c6 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -10,14 +10,12 @@
* published by the Free Software Foundation.
*/

-#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/clockchips.h>
#include <linux/cpu.h>
-#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/percpu.h>
#include <linux/of.h>
@@ -388,6 +386,13 @@ static void exynos4_mct_tick_start(unsigned long cycles,
exynos4_mct_write(tmp, mevt->base + MCT_L_TCON_OFFSET);
}

+static void exynos4_mct_tick_clear(struct mct_clock_event_device *mevt)
+{
+ /* Clear the MCT tick interrupt */
+ if (readl_relaxed(reg_base + mevt->base + MCT_L_INT_CSTAT_OFFSET) & 1)
+ exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
+}
+
static int exynos4_tick_set_next_event(unsigned long cycles,
struct clock_event_device *evt)
{
@@ -404,6 +409,7 @@ static int set_state_shutdown(struct clock_event_device *evt)

mevt = container_of(evt, struct mct_clock_event_device, evt);
exynos4_mct_tick_stop(mevt);
+ exynos4_mct_tick_clear(mevt);
return 0;
}

@@ -420,8 +426,11 @@ static int set_state_periodic(struct clock_event_device *evt)
return 0;
}

-static void exynos4_mct_tick_clear(struct mct_clock_event_device *mevt)
+static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id)
{
+ struct mct_clock_event_device *mevt = dev_id;
+ struct clock_event_device *evt = &mevt->evt;
+
/*
* This is for supporting oneshot mode.
* Mct would generate interrupt periodically
@@ -430,16 +439,6 @@ static void exynos4_mct_tick_clear(struct mct_clock_event_device *mevt)
if (!clockevent_state_periodic(&mevt->evt))
exynos4_mct_tick_stop(mevt);

- /* Clear the MCT tick interrupt */
- if (readl_relaxed(reg_base + mevt->base + MCT_L_INT_CSTAT_OFFSET) & 1)
- exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
-}
-
-static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id)
-{
- struct mct_clock_event_device *mevt = dev_id;
- struct clock_event_device *evt = &mevt->evt;
-
exynos4_mct_tick_clear(mevt);

evt->event_handler(evt);
@@ -507,13 +506,12 @@ static int __init exynos4_timer_resources(struct device_node *np, void __iomem *
int err, cpu;
struct clk *mct_clk, *tick_clk;

- tick_clk = np ? of_clk_get_by_name(np, "fin_pll") :
- clk_get(NULL, "fin_pll");
+ tick_clk = of_clk_get_by_name(np, "fin_pll");
if (IS_ERR(tick_clk))
panic("%s: unable to determine tick clock rate\n", __func__);
clk_rate = clk_get_rate(tick_clk);

- mct_clk = np ? of_clk_get_by_name(np, "mct") : clk_get(NULL, "mct");
+ mct_clk = of_clk_get_by_name(np, "mct");
if (IS_ERR(mct_clk))
panic("%s: unable to retrieve mct clock instance\n", __func__);
clk_prepare_enable(mct_clk);
@@ -562,7 +560,19 @@ static int __init exynos4_timer_resources(struct device_node *np, void __iomem *
return 0;

out_irq:
- free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick);
+ if (mct_int_type == MCT_INT_PPI) {
+ free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick);
+ } else {
+ for_each_possible_cpu(cpu) {
+ struct mct_clock_event_device *pcpu_mevt =
+ per_cpu_ptr(&percpu_mct_tick, cpu);
+
+ if (pcpu_mevt->evt.irq != -1) {
+ free_irq(pcpu_mevt->evt.irq, pcpu_mevt);
+ pcpu_mevt->evt.irq = -1;
+ }
+ }
+ }
return err;
}

@@ -581,11 +591,7 @@ static int __init mct_init_dt(struct device_node *np, unsigned int int_type)
* timer irqs are specified after the four global timer
* irqs are specified.
*/
-#ifdef CONFIG_OF
nr_irqs = of_irq_count(np);
-#else
- nr_irqs = 0;
-#endif
for (i = MCT_L0_IRQ; i < nr_irqs; i++)
mct_irqs[i] = irq_of_parse_and_map(np, i);

diff --git a/drivers/clocksource/cs5535-clockevt.c b/drivers/clocksource/timer-cs5535.c
similarity index 100%
rename from drivers/clocksource/cs5535-clockevt.c
rename to drivers/clocksource/timer-cs5535.c
diff --git a/drivers/clocksource/pxa_timer.c b/drivers/clocksource/timer-pxa.c
similarity index 100%
rename from drivers/clocksource/pxa_timer.c
rename to drivers/clocksource/timer-pxa.c
diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
index 431892200a08..e8163693e936 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -95,13 +95,30 @@ static int __init riscv_timer_init_dt(struct device_node *n)
struct clocksource *cs;

hartid = riscv_of_processor_hartid(n);
+ if (hartid < 0) {
+ pr_warn("Not valid hartid for node [%pOF] error = [%d]\n",
+ n, hartid);
+ return hartid;
+ }
+
cpuid = riscv_hartid_to_cpuid(hartid);
+ if (cpuid < 0) {
+ pr_warn("Invalid cpuid for hartid [%d]\n", hartid);
+ return cpuid;
+ }

if (cpuid != smp_processor_id())
return 0;

+ pr_info("%s: Registering clocksource cpuid [%d] hartid [%d]\n",
+ __func__, cpuid, hartid);
cs = per_cpu_ptr(&riscv_clocksource, cpuid);
- clocksource_register_hz(cs, riscv_timebase);
+ error = clocksource_register_hz(cs, riscv_timebase);
+ if (error) {
+ pr_err("RISCV timer register failed [%d] for cpu = [%d]\n",
+ error, cpuid);
+ return error;
+ }

sched_clock_register(riscv_sched_clock,
BITS_PER_LONG, riscv_timebase);
@@ -110,8 +127,8 @@ static int __init riscv_timer_init_dt(struct device_node *n)
"clockevents/riscv/timer:starting",
riscv_timer_starting_cpu, riscv_timer_dying_cpu);
if (error)
- pr_err("RISCV timer register failed [%d] for cpu = [%d]\n",
- error, cpuid);
+ pr_err("cpu hp setup state failed for RISCV timer [%d]\n",
+ error);
return error;
}

diff --git a/drivers/clocksource/timer-sun5i.c b/drivers/clocksource/timer-sun5i.c
index 3b56ea3f52af..552c5254390c 100644
--- a/drivers/clocksource/timer-sun5i.c
+++ b/drivers/clocksource/timer-sun5i.c
@@ -202,6 +202,11 @@ static int __init sun5i_setup_clocksource(struct device_node *node,
}

rate = clk_get_rate(clk);
+ if (!rate) {
+ pr_err("Couldn't get parent clock rate\n");
+ ret = -EINVAL;
+ goto err_disable_clk;
+ }

cs->timer.base = base;
cs->timer.clk = clk;
@@ -275,6 +280,11 @@ static int __init sun5i_setup_clockevent(struct device_node *node, void __iomem
}

rate = clk_get_rate(clk);
+ if (!rate) {
+ pr_err("Couldn't get parent clock rate\n");
+ ret = -EINVAL;
+ goto err_disable_clk;
+ }

ce->timer.base = base;
ce->timer.ticks_per_jiffy = DIV_ROUND_UP(rate, HZ);
diff --git a/drivers/clocksource/tango_xtal.c b/drivers/clocksource/timer-tango-xtal.c
similarity index 100%
rename from drivers/clocksource/tango_xtal.c
rename to drivers/clocksource/timer-tango-xtal.c
diff --git a/drivers/clocksource/timer-tegra20.c b/drivers/clocksource/timer-tegra20.c
index 4293943f4e2b..fdb3d795a409 100644
--- a/drivers/clocksource/timer-tegra20.c
+++ b/drivers/clocksource/timer-tegra20.c
@@ -15,21 +15,24 @@
*
*/

-#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/clockchips.h>
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/delay.h>
#include <linux/err.h>
-#include <linux/time.h>
#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/clockchips.h>
-#include <linux/clocksource.h>
-#include <linux/clk.h>
-#include <linux/io.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
+#include <linux/percpu.h>
#include <linux/sched_clock.h>
-#include <linux/delay.h>
+#include <linux/time.h>
+
+#include "timer-of.h"

+#ifdef CONFIG_ARM
#include <asm/mach/time.h>
+#endif

#define RTC_SECONDS 0x08
#define RTC_SHADOW_SECONDS 0x0c
@@ -39,74 +42,161 @@
#define TIMERUS_USEC_CFG 0x14
#define TIMERUS_CNTR_FREEZE 0x4c

-#define TIMER1_BASE 0x0
-#define TIMER2_BASE 0x8
-#define TIMER3_BASE 0x50
-#define TIMER4_BASE 0x58
-
-#define TIMER_PTV 0x0
-#define TIMER_PCR 0x4
-
+#define TIMER_PTV 0x0
+#define TIMER_PTV_EN BIT(31)
+#define TIMER_PTV_PER BIT(30)
+#define TIMER_PCR 0x4
+#define TIMER_PCR_INTR_CLR BIT(30)
+
+#ifdef CONFIG_ARM
+#define TIMER_CPU0 0x50 /* TIMER3 */
+#else
+#define TIMER_CPU0 0x90 /* TIMER10 */
+#define TIMER10_IRQ_IDX 10
+#define IRQ_IDX_FOR_CPU(cpu) (TIMER10_IRQ_IDX + cpu)
+#endif
+#define TIMER_BASE_FOR_CPU(cpu) (TIMER_CPU0 + (cpu) * 8)
+
+static u32 usec_config;
static void __iomem *timer_reg_base;
+#ifdef CONFIG_ARM
static void __iomem *rtc_base;
-
static struct timespec64 persistent_ts;
static u64 persistent_ms, last_persistent_ms;
-
static struct delay_timer tegra_delay_timer;
-
-#define timer_writel(value, reg) \
- writel_relaxed(value, timer_reg_base + (reg))
-#define timer_readl(reg) \
- readl_relaxed(timer_reg_base + (reg))
+#endif

static int tegra_timer_set_next_event(unsigned long cycles,
struct clock_event_device *evt)
{
- u32 reg;
+ void __iomem *reg_base = timer_of_base(to_timer_of(evt));

- reg = 0x80000000 | ((cycles > 1) ? (cycles-1) : 0);
- timer_writel(reg, TIMER3_BASE + TIMER_PTV);
+ writel(TIMER_PTV_EN |
+ ((cycles > 1) ? (cycles - 1) : 0), /* n+1 scheme */
+ reg_base + TIMER_PTV);

return 0;
}

-static inline void timer_shutdown(struct clock_event_device *evt)
+static int tegra_timer_shutdown(struct clock_event_device *evt)
{
- timer_writel(0, TIMER3_BASE + TIMER_PTV);
+ void __iomem *reg_base = timer_of_base(to_timer_of(evt));
+
+ writel(0, reg_base + TIMER_PTV);
+
+ return 0;
}

-static int tegra_timer_shutdown(struct clock_event_device *evt)
+static int tegra_timer_set_periodic(struct clock_event_device *evt)
{
- timer_shutdown(evt);
+ void __iomem *reg_base = timer_of_base(to_timer_of(evt));
+
+ writel(TIMER_PTV_EN | TIMER_PTV_PER |
+ ((timer_of_rate(to_timer_of(evt)) / HZ) - 1),
+ reg_base + TIMER_PTV);
+
return 0;
}

-static int tegra_timer_set_periodic(struct clock_event_device *evt)
+static irqreturn_t tegra_timer_isr(int irq, void *dev_id)
+{
+ struct clock_event_device *evt = (struct clock_event_device *)dev_id;
+ void __iomem *reg_base = timer_of_base(to_timer_of(evt));
+
+ writel(TIMER_PCR_INTR_CLR, reg_base + TIMER_PCR);
+ evt->event_handler(evt);
+
+ return IRQ_HANDLED;
+}
+
+static void tegra_timer_suspend(struct clock_event_device *evt)
+{
+ void __iomem *reg_base = timer_of_base(to_timer_of(evt));
+
+ writel(TIMER_PCR_INTR_CLR, reg_base + TIMER_PCR);
+}
+
+static void tegra_timer_resume(struct clock_event_device *evt)
+{
+ writel(usec_config, timer_reg_base + TIMERUS_USEC_CFG);
+}
+
+#ifdef CONFIG_ARM64
+static DEFINE_PER_CPU(struct timer_of, tegra_to) = {
+ .flags = TIMER_OF_CLOCK | TIMER_OF_BASE,
+
+ .clkevt = {
+ .name = "tegra_timer",
+ .rating = 460,
+ .features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC,
+ .set_next_event = tegra_timer_set_next_event,
+ .set_state_shutdown = tegra_timer_shutdown,
+ .set_state_periodic = tegra_timer_set_periodic,
+ .set_state_oneshot = tegra_timer_shutdown,
+ .tick_resume = tegra_timer_shutdown,
+ .suspend = tegra_timer_suspend,
+ .resume = tegra_timer_resume,
+ },
+};
+
+static int tegra_timer_setup(unsigned int cpu)
{
- u32 reg = 0xC0000000 | ((1000000 / HZ) - 1);
+ struct timer_of *to = per_cpu_ptr(&tegra_to, cpu);
+
+ irq_force_affinity(to->clkevt.irq, cpumask_of(cpu));
+ enable_irq(to->clkevt.irq);
+
+ clockevents_config_and_register(&to->clkevt, timer_of_rate(to),
+ 1, /* min */
+ 0x1fffffff); /* 29 bits */

- timer_shutdown(evt);
- timer_writel(reg, TIMER3_BASE + TIMER_PTV);
return 0;
}

-static struct clock_event_device tegra_clockevent = {
- .name = "timer0",
- .rating = 300,
- .features = CLOCK_EVT_FEAT_ONESHOT |
- CLOCK_EVT_FEAT_PERIODIC |
- CLOCK_EVT_FEAT_DYNIRQ,
- .set_next_event = tegra_timer_set_next_event,
- .set_state_shutdown = tegra_timer_shutdown,
- .set_state_periodic = tegra_timer_set_periodic,
- .set_state_oneshot = tegra_timer_shutdown,
- .tick_resume = tegra_timer_shutdown,
+static int tegra_timer_stop(unsigned int cpu)
+{
+ struct timer_of *to = per_cpu_ptr(&tegra_to, cpu);
+
+ to->clkevt.set_state_shutdown(&to->clkevt);
+ disable_irq_nosync(to->clkevt.irq);
+
+ return 0;
+}
+#else /* CONFIG_ARM */
+static struct timer_of tegra_to = {
+ .flags = TIMER_OF_CLOCK | TIMER_OF_BASE | TIMER_OF_IRQ,
+
+ .clkevt = {
+ .name = "tegra_timer",
+ .rating = 300,
+ .features = CLOCK_EVT_FEAT_ONESHOT |
+ CLOCK_EVT_FEAT_PERIODIC |
+ CLOCK_EVT_FEAT_DYNIRQ,
+ .set_next_event = tegra_timer_set_next_event,
+ .set_state_shutdown = tegra_timer_shutdown,
+ .set_state_periodic = tegra_timer_set_periodic,
+ .set_state_oneshot = tegra_timer_shutdown,
+ .tick_resume = tegra_timer_shutdown,
+ .suspend = tegra_timer_suspend,
+ .resume = tegra_timer_resume,
+ .cpumask = cpu_possible_mask,
+ },
+
+ .of_irq = {
+ .index = 2,
+ .flags = IRQF_TIMER | IRQF_TRIGGER_HIGH,
+ .handler = tegra_timer_isr,
+ },
};

static u64 notrace tegra_read_sched_clock(void)
{
- return timer_readl(TIMERUS_CNTR_1US);
+ return readl(timer_reg_base + TIMERUS_CNTR_1US);
+}
+
+static unsigned long tegra_delay_timer_read_counter_long(void)
+{
+ return readl(timer_reg_base + TIMERUS_CNTR_1US);
}

/*
@@ -143,100 +233,155 @@ static void tegra_read_persistent_clock64(struct timespec64 *ts)
timespec64_add_ns(&persistent_ts, delta * NSEC_PER_MSEC);
*ts = persistent_ts;
}
+#endif

-static unsigned long tegra_delay_timer_read_counter_long(void)
-{
- return readl(timer_reg_base + TIMERUS_CNTR_1US);
-}
-
-static irqreturn_t tegra_timer_interrupt(int irq, void *dev_id)
-{
- struct clock_event_device *evt = (struct clock_event_device *)dev_id;
- timer_writel(1<<30, TIMER3_BASE + TIMER_PCR);
- evt->event_handler(evt);
- return IRQ_HANDLED;
-}
-
-static struct irqaction tegra_timer_irq = {
- .name = "timer0",
- .flags = IRQF_TIMER | IRQF_TRIGGER_HIGH,
- .handler = tegra_timer_interrupt,
- .dev_id = &tegra_clockevent,
-};
-
-static int __init tegra20_init_timer(struct device_node *np)
+static int tegra_timer_common_init(struct device_node *np, struct timer_of *to)
{
- struct clk *clk;
- unsigned long rate;
- int ret;
-
- timer_reg_base = of_iomap(np, 0);
- if (!timer_reg_base) {
- pr_err("Can't map timer registers\n");
- return -ENXIO;
- }
+ int ret = 0;

- tegra_timer_irq.irq = irq_of_parse_and_map(np, 2);
- if (tegra_timer_irq.irq <= 0) {
- pr_err("Failed to map timer IRQ\n");
- return -EINVAL;
- }
+ ret = timer_of_init(np, to);
+ if (ret < 0)
+ goto out;

- clk = of_clk_get(np, 0);
- if (IS_ERR(clk)) {
- pr_warn("Unable to get timer clock. Assuming 12Mhz input clock.\n");
- rate = 12000000;
- } else {
- clk_prepare_enable(clk);
- rate = clk_get_rate(clk);
- }
+ timer_reg_base = timer_of_base(to);

- switch (rate) {
+ /*
+ * Configure microsecond timers to have 1MHz clock
+ * Config register is 0xqqww, where qq is "dividend", ww is "divisor"
+ * Uses n+1 scheme
+ */
+ switch (timer_of_rate(to)) {
case 12000000:
- timer_writel(0x000b, TIMERUS_USEC_CFG);
+ usec_config = 0x000b; /* (11+1)/(0+1) */
+ break;
+ case 12800000:
+ usec_config = 0x043f; /* (63+1)/(4+1) */
break;
case 13000000:
- timer_writel(0x000c, TIMERUS_USEC_CFG);
+ usec_config = 0x000c; /* (12+1)/(0+1) */
+ break;
+ case 16800000:
+ usec_config = 0x0453; /* (83+1)/(4+1) */
break;
case 19200000:
- timer_writel(0x045f, TIMERUS_USEC_CFG);
+ usec_config = 0x045f; /* (95+1)/(4+1) */
break;
case 26000000:
- timer_writel(0x0019, TIMERUS_USEC_CFG);
+ usec_config = 0x0019; /* (25+1)/(0+1) */
+ break;
+ case 38400000:
+ usec_config = 0x04bf; /* (191+1)/(4+1) */
+ break;
+ case 48000000:
+ usec_config = 0x002f; /* (47+1)/(0+1) */
break;
default:
- WARN(1, "Unknown clock rate");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ writel(usec_config, timer_of_base(to) + TIMERUS_USEC_CFG);
+
+out:
+ return ret;
+}
+
+#ifdef CONFIG_ARM64
+static int __init tegra_init_timer(struct device_node *np)
+{
+ int cpu, ret = 0;
+ struct timer_of *to;
+
+ to = this_cpu_ptr(&tegra_to);
+ ret = tegra_timer_common_init(np, to);
+ if (ret < 0)
+ goto out;
+
+ for_each_possible_cpu(cpu) {
+ struct timer_of *cpu_to;
+
+ cpu_to = per_cpu_ptr(&tegra_to, cpu);
+ cpu_to->of_base.base = timer_reg_base + TIMER_BASE_FOR_CPU(cpu);
+ cpu_to->of_clk.rate = timer_of_rate(to);
+ cpu_to->clkevt.cpumask = cpumask_of(cpu);
+ cpu_to->clkevt.irq =
+ irq_of_parse_and_map(np, IRQ_IDX_FOR_CPU(cpu));
+ if (!cpu_to->clkevt.irq) {
+ pr_err("%s: can't map IRQ for CPU%d\n",
+ __func__, cpu);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ irq_set_status_flags(cpu_to->clkevt.irq, IRQ_NOAUTOEN);
+ ret = request_irq(cpu_to->clkevt.irq, tegra_timer_isr,
+ IRQF_TIMER | IRQF_NOBALANCING,
+ cpu_to->clkevt.name, &cpu_to->clkevt);
+ if (ret) {
+ pr_err("%s: cannot setup irq %d for CPU%d\n",
+ __func__, cpu_to->clkevt.irq, cpu);
+ ret = -EINVAL;
+ goto out_irq;
+ }
+ }
+
+ cpuhp_setup_state(CPUHP_AP_TEGRA_TIMER_STARTING,
+ "AP_TEGRA_TIMER_STARTING", tegra_timer_setup,
+ tegra_timer_stop);
+
+ return ret;
+out_irq:
+ for_each_possible_cpu(cpu) {
+ struct timer_of *cpu_to;
+
+ cpu_to = per_cpu_ptr(&tegra_to, cpu);
+ if (cpu_to->clkevt.irq) {
+ free_irq(cpu_to->clkevt.irq, &cpu_to->clkevt);
+ irq_dispose_mapping(cpu_to->clkevt.irq);
+ }
}
+out:
+ timer_of_cleanup(to);
+ return ret;
+}
+#else /* CONFIG_ARM */
+static int __init tegra_init_timer(struct device_node *np)
+{
+ int ret = 0;
+
+ ret = tegra_timer_common_init(np, &tegra_to);
+ if (ret < 0)
+ goto out;

- sched_clock_register(tegra_read_sched_clock, 32, 1000000);
+ tegra_to.of_base.base = timer_reg_base + TIMER_BASE_FOR_CPU(0);
+ tegra_to.of_clk.rate = 1000000; /* microsecond timer */

+ sched_clock_register(tegra_read_sched_clock, 32,
+ timer_of_rate(&tegra_to));
ret = clocksource_mmio_init(timer_reg_base + TIMERUS_CNTR_1US,
- "timer_us", 1000000, 300, 32,
- clocksource_mmio_readl_up);
+ "timer_us", timer_of_rate(&tegra_to),
+ 300, 32, clocksource_mmio_readl_up);
if (ret) {
pr_err("Failed to register clocksource\n");
- return ret;
+ goto out;
}

tegra_delay_timer.read_current_timer =
tegra_delay_timer_read_counter_long;
- tegra_delay_timer.freq = 1000000;
+ tegra_delay_timer.freq = timer_of_rate(&tegra_to);
register_current_timer_delay(&tegra_delay_timer);

- ret = setup_irq(tegra_timer_irq.irq, &tegra_timer_irq);
- if (ret) {
- pr_err("Failed to register timer IRQ: %d\n", ret);
- return ret;
- }
+ clockevents_config_and_register(&tegra_to.clkevt,
+ timer_of_rate(&tegra_to),
+ 0x1,
+ 0x1fffffff);

- tegra_clockevent.cpumask = cpu_possible_mask;
- tegra_clockevent.irq = tegra_timer_irq.irq;
- clockevents_config_and_register(&tegra_clockevent, 1000000,
- 0x1, 0x1fffffff);
+ return ret;
+out:
+ timer_of_cleanup(&tegra_to);

- return 0;
+ return ret;
}
-TIMER_OF_DECLARE(tegra20_timer, "nvidia,tegra20-timer", tegra20_init_timer);

static int __init tegra20_init_rtc(struct device_node *np)
{
@@ -261,3 +406,6 @@ static int __init tegra20_init_rtc(struct device_node *np)
return register_persistent_clock(tegra_read_persistent_clock64);
}
TIMER_OF_DECLARE(tegra20_rtc, "nvidia,tegra20-rtc", tegra20_init_rtc);
+#endif
+TIMER_OF_DECLARE(tegra210_timer, "nvidia,tegra210-timer", tegra_init_timer);
+TIMER_OF_DECLARE(tegra20_timer, "nvidia,tegra20-timer", tegra_init_timer);
diff --git a/drivers/soc/tegra/Kconfig b/drivers/soc/tegra/Kconfig
index fe4481676da6..a0b03443d8c1 100644
--- a/drivers/soc/tegra/Kconfig
+++ b/drivers/soc/tegra/Kconfig
@@ -76,6 +76,7 @@ config ARCH_TEGRA_210_SOC
select PINCTRL_TEGRA210
select SOC_TEGRA_FLOWCTRL
select SOC_TEGRA_PMC
+ select TEGRA_TIMER
help
Enable support for the NVIDIA Tegra210 SoC. Also known as Tegra X1,
the Tegra210 has four Cortex-A57 cores paired with four Cortex-A53
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index fd586d0301e7..e78281d07b70 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -121,6 +121,7 @@ enum cpuhp_state {
CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
CPUHP_AP_ARM_TWD_STARTING,
CPUHP_AP_QCOM_TIMER_STARTING,
+ CPUHP_AP_TEGRA_TIMER_STARTING,
CPUHP_AP_ARMADA_TIMER_STARTING,
CPUHP_AP_MARCO_TIMER_STARTING,
CPUHP_AP_MIPS_GIC_TIMER_STARTING,
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index e96581ca7c9d..b20798fc5191 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -12,7 +12,7 @@ struct siginfo;

struct cpu_timer_list {
struct list_head entry;
- u64 expires, incr;
+ u64 expires;
struct task_struct *task;
int firing;
};
diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig
index 939a2056c87a..37301430970e 100644
--- a/kernel/rcu/Kconfig
+++ b/kernel/rcu/Kconfig
@@ -87,36 +87,6 @@ config RCU_STALL_COMMON
config RCU_NEED_SEGCBLIST
def_bool ( TREE_RCU || PREEMPT_RCU || TREE_SRCU )

-config CONTEXT_TRACKING
- bool
-
-config CONTEXT_TRACKING_FORCE
- bool "Force context tracking"
- depends on CONTEXT_TRACKING
- default y if !NO_HZ_FULL
- help
- The major pre-requirement for full dynticks to work is to
- support the context tracking subsystem. But there are also
- other dependencies to provide in order to make the full
- dynticks working.
-
- This option stands for testing when an arch implements the
- context tracking backend but doesn't yet fullfill all the
- requirements to make the full dynticks feature working.
- Without the full dynticks, there is no way to test the support
- for context tracking and the subsystems that rely on it: RCU
- userspace extended quiescent state and tickless cputime
- accounting. This option copes with the absence of the full
- dynticks subsystem by forcing the context tracking on all
- CPUs in the system.
-
- Say Y only if you're working on the development of an
- architecture backend for the context tracking.
-
- Say N otherwise, this option brings an overhead that you
- don't want in production.
-
-
config RCU_FANOUT
int "Tree-based hierarchical RCU fanout value"
range 2 64 if 64BIT
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 58b981f4bb5d..e2c038d6c13c 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -117,6 +117,35 @@ config NO_HZ_FULL

endchoice

+config CONTEXT_TRACKING
+ bool
+
+config CONTEXT_TRACKING_FORCE
+ bool "Force context tracking"
+ depends on CONTEXT_TRACKING
+ default y if !NO_HZ_FULL
+ help
+ The major pre-requirement for full dynticks to work is to
+ support the context tracking subsystem. But there are also
+ other dependencies to provide in order to make the full
+ dynticks working.
+
+ This option stands for testing when an arch implements the
+ context tracking backend but doesn't yet fullfill all the
+ requirements to make the full dynticks feature working.
+ Without the full dynticks, there is no way to test the support
+ for context tracking and the subsystems that rely on it: RCU
+ userspace extended quiescent state and tickless cputime
+ accounting. This option copes with the absence of the full
+ dynticks subsystem by forcing the context tracking on all
+ CPUs in the system.
+
+ Say Y only if you're working on the development of an
+ architecture backend for the context tracking.
+
+ Say N otherwise, this option brings an overhead that you
+ don't want in production.
+
config NO_HZ
bool "Old Idle dynticks config"
depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index f5cfa1b73d6f..6418e1bdc549 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -364,7 +364,7 @@ static bool hrtimer_fixup_activate(void *addr, enum debug_obj_state state)
switch (state) {
case ODEBUG_STATE_ACTIVE:
WARN_ON(1);
-
+ /* fall through */
default:
return false;
}
diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 80f955210861..0a426f4e3125 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -67,13 +67,13 @@ static void bump_cpu_timer(struct k_itimer *timer, u64 now)
int i;
u64 delta, incr;

- if (timer->it.cpu.incr == 0)
+ if (!timer->it_interval)
return;

if (now < timer->it.cpu.expires)
return;

- incr = timer->it.cpu.incr;
+ incr = timer->it_interval;
delta = now + incr - timer->it.cpu.expires;

/* Don't use (incr*2 < delta), incr*2 might overflow. */
@@ -520,7 +520,7 @@ static void cpu_timer_fire(struct k_itimer *timer)
*/
wake_up_process(timer->it_process);
timer->it.cpu.expires = 0;
- } else if (timer->it.cpu.incr == 0) {
+ } else if (!timer->it_interval) {
/*
* One-shot timer. Clear it as soon as it's fired.
*/
@@ -606,7 +606,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
*/

ret = 0;
- old_incr = timer->it.cpu.incr;
+ old_incr = timer->it_interval;
old_expires = timer->it.cpu.expires;
if (unlikely(timer->it.cpu.firing)) {
timer->it.cpu.firing = -1;
@@ -684,8 +684,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
* Install the new reload setting, and
* set up the signal and overrun bookkeeping.
*/
- timer->it.cpu.incr = timespec64_to_ns(&new->it_interval);
- timer->it_interval = ns_to_ktime(timer->it.cpu.incr);
+ timer->it_interval = timespec64_to_ktime(new->it_interval);

/*
* This acts as a modification timestamp for the timer,
@@ -724,7 +723,7 @@ static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec64 *itp
/*
* Easy part: convert the reload time.
*/
- itp->it_interval = ns_to_timespec64(timer->it.cpu.incr);
+ itp->it_interval = ktime_to_timespec64(timer->it_interval);

if (!timer->it.cpu.expires)
return;
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 803fa67aace9..ee834d4fb814 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -375,6 +375,7 @@ void tick_broadcast_control(enum tick_broadcast_mode mode)
switch (mode) {
case TICK_BROADCAST_FORCE:
tick_broadcast_forced = 1;
+ /* fall through */
case TICK_BROADCAST_ON:
cpumask_set_cpu(cpu, tick_broadcast_on);
if (!cpumask_test_and_set_cpu(cpu, tick_broadcast_mask)) {
diff --git a/kernel/time/timekeeping_debug.c b/kernel/time/timekeeping_debug.c
index 86489950d690..b73e8850e58d 100644
--- a/kernel/time/timekeeping_debug.c
+++ b/kernel/time/timekeeping_debug.c
@@ -37,15 +37,8 @@ DEFINE_SHOW_ATTRIBUTE(tk_debug_sleep_time);

static int __init tk_debug_sleep_time_init(void)
{
- struct dentry *d;
-
- d = debugfs_create_file("sleep_time", 0444, NULL, NULL,
- &tk_debug_sleep_time_fops);
- if (!d) {
- pr_err("Failed to create sleep_time debug file\n");
- return -ENOMEM;
- }
-
+ debugfs_create_file("sleep_time", 0444, NULL, NULL,
+ &tk_debug_sleep_time_fops);
return 0;
}
late_initcall(tk_debug_sleep_time_init);
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 444156debfa0..167e71f9ed3c 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -647,7 +647,7 @@ static bool timer_fixup_activate(void *addr, enum debug_obj_state state)

case ODEBUG_STATE_ACTIVE:
WARN_ON(1);
-
+ /* fall through */
default:
return false;
}

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