From: Stephen Boyd <sboyd@codeaurora.org>
Date: Sun, 2 Jun 2013 06:39:40 +0000 (-0700)
Subject: sched_clock: Make ARM's sched_clock generic for all architectures
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=38ff87f;p=linux.git
sched_clock: Make ARM's sched_clock generic for all architectures
Nothing about the sched_clock implementation in the ARM port is
specific to the architecture. Generalize the code so that other
architectures can use it by selecting GENERIC_SCHED_CLOCK.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
[jstultz: Merge minor collisions with other patches in my tree]
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 49d993cee5123..53d3a356f61f8 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -14,6 +14,7 @@ config ARM
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
select GENERIC_PCI_IOMAP
+ select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
select GENERIC_IDLE_POLL_SETUP
select GENERIC_STRNCPY_FROM_USER
diff --git a/arch/arm/common/timer-sp.c b/arch/arm/common/timer-sp.c
index ddc740769601a..023ee63827a2b 100644
--- a/arch/arm/common/timer-sp.c
+++ b/arch/arm/common/timer-sp.c
@@ -28,8 +28,8 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
+#include <linux/sched_clock.h>
-#include <asm/sched_clock.h>
#include <asm/hardware/arm_timer.h>
#include <asm/hardware/timer-sp.h>
diff --git a/arch/arm/include/asm/sched_clock.h b/arch/arm/include/asm/sched_clock.h
deleted file mode 100644
index 3d520ddca61bb..0000000000000
--- a/arch/arm/include/asm/sched_clock.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * sched_clock.h: support for extending counters to full 64-bit ns counter
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#ifndef ASM_SCHED_CLOCK
-#define ASM_SCHED_CLOCK
-
-extern void sched_clock_postinit(void);
-extern void setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate);
-
-extern unsigned long long (*sched_clock_func)(void);
-
-#endif
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 5f3338eacad21..97cb0576d07c3 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -16,7 +16,7 @@ CFLAGS_REMOVE_return_address.o = -pg
# Object file lists.
obj-y := elf.o entry-armv.o entry-common.o irq.o opcodes.o \
- process.o ptrace.o return_address.o sched_clock.o \
+ process.o ptrace.o return_address.o \
setup.o signal.o stacktrace.o sys_arm.o time.o traps.o
obj-$(CONFIG_ATAGS) += atags_parse.o
diff --git a/arch/arm/kernel/arch_timer.c b/arch/arm/kernel/arch_timer.c
index 59dcdced6e30d..221f07b11ccb0 100644
--- a/arch/arm/kernel/arch_timer.c
+++ b/arch/arm/kernel/arch_timer.c
@@ -11,9 +11,9 @@
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
+#include <linux/sched_clock.h>
#include <asm/delay.h>
-#include <asm/sched_clock.h>
#include <clocksource/arm_arch_timer.h>
diff --git a/arch/arm/kernel/sched_clock.c b/arch/arm/kernel/sched_clock.c
deleted file mode 100644
index a781c59b93c03..0000000000000
--- a/arch/arm/kernel/sched_clock.c
+++ /dev/null
@@ -1,216 +0,0 @@
-/*
- * sched_clock.c: support for extending counters to full 64-bit ns counter
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/clocksource.h>
-#include <linux/init.h>
-#include <linux/jiffies.h>
-#include <linux/kernel.h>
-#include <linux/moduleparam.h>
-#include <linux/sched.h>
-#include <linux/syscore_ops.h>
-#include <linux/timer.h>
-
-#include <asm/sched_clock.h>
-
-struct clock_data {
- u64 epoch_ns;
- u32 epoch_cyc;
- u32 epoch_cyc_copy;
- unsigned long rate;
- u32 mult;
- u32 shift;
- bool suspended;
-};
-
-static void sched_clock_poll(unsigned long wrap_ticks);
-static DEFINE_TIMER(sched_clock_timer, sched_clock_poll, 0, 0);
-static int irqtime = -1;
-
-core_param(irqtime, irqtime, int, 0400);
-
-static struct clock_data cd = {
- .mult = NSEC_PER_SEC / HZ,
-};
-
-static u32 __read_mostly sched_clock_mask = 0xffffffff;
-
-static u32 notrace jiffy_sched_clock_read(void)
-{
- return (u32)(jiffies - INITIAL_JIFFIES);
-}
-
-static u32 __read_mostly (*read_sched_clock)(void) = jiffy_sched_clock_read;
-
-static inline u64 notrace cyc_to_ns(u64 cyc, u32 mult, u32 shift)
-{
- return (cyc * mult) >> shift;
-}
-
-static unsigned long long notrace cyc_to_sched_clock(u32 cyc, u32 mask)
-{
- u64 epoch_ns;
- u32 epoch_cyc;
-
- /*
- * Load the epoch_cyc and epoch_ns atomically. We do this by
- * ensuring that we always write epoch_cyc, epoch_ns and
- * epoch_cyc_copy in strict order, and read them in strict order.
- * If epoch_cyc and epoch_cyc_copy are not equal, then we're in
- * the middle of an update, and we should repeat the load.
- */
- do {
- epoch_cyc = cd.epoch_cyc;
- smp_rmb();
- epoch_ns = cd.epoch_ns;
- smp_rmb();
- } while (epoch_cyc != cd.epoch_cyc_copy);
-
- return epoch_ns + cyc_to_ns((cyc - epoch_cyc) & mask, cd.mult, cd.shift);
-}
-
-/*
- * Atomically update the sched_clock epoch.
- */
-static void notrace update_sched_clock(void)
-{
- unsigned long flags;
- u32 cyc;
- u64 ns;
-
- cyc = read_sched_clock();
- ns = cd.epoch_ns +
- cyc_to_ns((cyc - cd.epoch_cyc) & sched_clock_mask,
- cd.mult, cd.shift);
- /*
- * Write epoch_cyc and epoch_ns in a way that the update is
- * detectable in cyc_to_fixed_sched_clock().
- */
- raw_local_irq_save(flags);
- cd.epoch_cyc_copy = cyc;
- smp_wmb();
- cd.epoch_ns = ns;
- smp_wmb();
- cd.epoch_cyc = cyc;
- raw_local_irq_restore(flags);
-}
-
-static void sched_clock_poll(unsigned long wrap_ticks)
-{
- mod_timer(&sched_clock_timer, round_jiffies(jiffies + wrap_ticks));
- update_sched_clock();
-}
-
-void __init setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate)
-{
- unsigned long r, w;
- u64 res, wrap;
- char r_unit;
-
- if (cd.rate > rate)
- return;
-
- BUG_ON(bits > 32);
- WARN_ON(!irqs_disabled());
- read_sched_clock = read;
- sched_clock_mask = (1 << bits) - 1;
- cd.rate = rate;
-
- /* calculate the mult/shift to convert counter ticks to ns. */
- clocks_calc_mult_shift(&cd.mult, &cd.shift, rate, NSEC_PER_SEC, 0);
-
- r = rate;
- if (r >= 4000000) {
- r /= 1000000;
- r_unit = 'M';
- } else if (r >= 1000) {
- r /= 1000;
- r_unit = 'k';
- } else
- r_unit = ' ';
-
- /* calculate how many ns until we wrap */
- wrap = cyc_to_ns((1ULL << bits) - 1, cd.mult, cd.shift);
- do_div(wrap, NSEC_PER_MSEC);
- w = wrap;
-
- /* calculate the ns resolution of this counter */
- res = cyc_to_ns(1ULL, cd.mult, cd.shift);
- pr_info("sched_clock: %u bits at %lu%cHz, resolution %lluns, wraps every %lums\n",
- bits, r, r_unit, res, w);
-
- /*
- * Start the timer to keep sched_clock() properly updated and
- * sets the initial epoch.
- */
- sched_clock_timer.data = msecs_to_jiffies(w - (w / 10));
- update_sched_clock();
-
- /*
- * Ensure that sched_clock() starts off at 0ns
- */
- cd.epoch_ns = 0;
-
- /* Enable IRQ time accounting if we have a fast enough sched_clock */
- if (irqtime > 0 || (irqtime == -1 && rate >= 1000000))
- enable_sched_clock_irqtime();
-
- pr_debug("Registered %pF as sched_clock source\n", read);
-}
-
-static unsigned long long notrace sched_clock_32(void)
-{
- u32 cyc = read_sched_clock();
- return cyc_to_sched_clock(cyc, sched_clock_mask);
-}
-
-unsigned long long __read_mostly (*sched_clock_func)(void) = sched_clock_32;
-
-unsigned long long notrace sched_clock(void)
-{
- if (cd.suspended)
- return cd.epoch_ns;
-
- return sched_clock_func();
-}
-
-void __init sched_clock_postinit(void)
-{
- /*
- * If no sched_clock function has been provided at that point,
- * make it the final one one.
- */
- if (read_sched_clock == jiffy_sched_clock_read)
- setup_sched_clock(jiffy_sched_clock_read, 32, HZ);
-
- sched_clock_poll(sched_clock_timer.data);
-}
-
-static int sched_clock_suspend(void)
-{
- sched_clock_poll(sched_clock_timer.data);
- cd.suspended = true;
- return 0;
-}
-
-static void sched_clock_resume(void)
-{
- cd.epoch_cyc = read_sched_clock();
- cd.epoch_cyc_copy = cd.epoch_cyc;
- cd.suspended = false;
-}
-
-static struct syscore_ops sched_clock_ops = {
- .suspend = sched_clock_suspend,
- .resume = sched_clock_resume,
-};
-
-static int __init sched_clock_syscore_init(void)
-{
- register_syscore_ops(&sched_clock_ops);
- return 0;
-}
-device_initcall(sched_clock_syscore_init);
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index abff4e9aaee07..98aee32583986 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -24,9 +24,9 @@
#include <linux/timer.h>
#include <linux/clocksource.h>
#include <linux/irq.h>
+#include <linux/sched_clock.h>
#include <asm/thread_info.h>
-#include <asm/sched_clock.h>
#include <asm/stacktrace.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
@@ -120,6 +120,4 @@ void __init time_init(void)
machine_desc->init_time();
else
clocksource_of_init();
-
- sched_clock_postinit();
}
diff --git a/arch/arm/mach-davinci/time.c b/arch/arm/mach-davinci/time.c
index bad361ec1666d..7a55b5c959712 100644
--- a/arch/arm/mach-davinci/time.c
+++ b/arch/arm/mach-davinci/time.c
@@ -18,8 +18,8 @@
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
+#include <linux/sched_clock.h>
-#include <asm/sched_clock.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
diff --git a/arch/arm/mach-imx/time.c b/arch/arm/mach-imx/time.c
index fea91313678b2..cd46529e9eaa1 100644
--- a/arch/arm/mach-imx/time.c
+++ b/arch/arm/mach-imx/time.c
@@ -26,8 +26,8 @@
#include <linux/clockchips.h>
#include <linux/clk.h>
#include <linux/err.h>
+#include <linux/sched_clock.h>
-#include <asm/sched_clock.h>
#include <asm/mach/time.h>
#include "common.h"
diff --git a/arch/arm/mach-integrator/integrator_ap.c b/arch/arm/mach-integrator/integrator_ap.c
index b23c8e4f28e85..aa4346227c416 100644
--- a/arch/arm/mach-integrator/integrator_ap.c
+++ b/arch/arm/mach-integrator/integrator_ap.c
@@ -41,6 +41,7 @@
#include <linux/stat.h>
#include <linux/sys_soc.h>
#include <linux/termios.h>
+#include <linux/sched_clock.h>
#include <video/vga.h>
#include <mach/hardware.h>
@@ -49,7 +50,6 @@
#include <asm/setup.h>
#include <asm/param.h> /* HZ */
#include <asm/mach-types.h>
-#include <asm/sched_clock.h>
#include <mach/lm.h>
#include <mach/irqs.h>
diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index 6600cff6bd922..58307cff1f188 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -30,6 +30,7 @@
#include <linux/export.h>
#include <linux/gpio.h>
#include <linux/cpu.h>
+#include <linux/sched_clock.h>
#include <mach/udc.h>
#include <mach/hardware.h>
@@ -38,7 +39,6 @@
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/irq.h>
-#include <asm/sched_clock.h>
#include <asm/system_misc.h>
#include <asm/mach/map.h>
diff --git a/arch/arm/mach-mmp/time.c b/arch/arm/mach-mmp/time.c
index 86a18b3d252ea..7ac41e83cfefd 100644
--- a/arch/arm/mach-mmp/time.c
+++ b/arch/arm/mach-mmp/time.c
@@ -28,8 +28,8 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
+#include <linux/sched_clock.h>
-#include <asm/sched_clock.h>
#include <mach/addr-map.h>
#include <mach/regs-timers.h>
#include <mach/regs-apbc.h>
diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index 284313f3e02cb..b6418fd5fe0dc 100644
--- a/arch/arm/mach-msm/timer.c
+++ b/arch/arm/mach-msm/timer.c
@@ -23,10 +23,10 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
+#include <linux/sched_clock.h>
#include <asm/mach/time.h>
#include <asm/localtimer.h>
-#include <asm/sched_clock.h>
#include "common.h"
diff --git a/arch/arm/mach-omap1/time.c b/arch/arm/mach-omap1/time.c
index 726ec23d29c71..80603d2fef770 100644
--- a/arch/arm/mach-omap1/time.c
+++ b/arch/arm/mach-omap1/time.c
@@ -43,9 +43,9 @@
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/io.h>
+#include <linux/sched_clock.h>
#include <asm/irq.h>
-#include <asm/sched_clock.h>
#include <mach/hardware.h>
#include <asm/mach/irq.h>
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index f8b23b8040d9a..4c069b0cab212 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -41,10 +41,10 @@
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/platform_data/dmtimer-omap.h>
+#include <linux/sched_clock.h>
#include <asm/mach/time.h>
#include <asm/smp_twd.h>
-#include <asm/sched_clock.h>
#include "omap_hwmod.h"
#include "omap_device.h"
diff --git a/arch/arm/mach-pxa/time.c b/arch/arm/mach-pxa/time.c
index 8f1ee92aea306..9aa852a8fab9f 100644
--- a/arch/arm/mach-pxa/time.c
+++ b/arch/arm/mach-pxa/time.c
@@ -16,11 +16,11 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/clockchips.h>
+#include <linux/sched_clock.h>
#include <asm/div64.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
-#include <asm/sched_clock.h>
#include <mach/regs-ost.h>
#include <mach/irqs.h>
diff --git a/arch/arm/mach-sa1100/time.c b/arch/arm/mach-sa1100/time.c
index a59a13a665a65..713c86cd3d640 100644
--- a/arch/arm/mach-sa1100/time.c
+++ b/arch/arm/mach-sa1100/time.c
@@ -14,9 +14,9 @@
#include <linux/irq.h>
#include <linux/timex.h>
#include <linux/clockchips.h>
+#include <linux/sched_clock.h>
#include <asm/mach/time.h>
-#include <asm/sched_clock.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
diff --git a/arch/arm/mach-u300/timer.c b/arch/arm/mach-u300/timer.c
index d9e73209c9b8d..af771b76fe1ca 100644
--- a/arch/arm/mach-u300/timer.c
+++ b/arch/arm/mach-u300/timer.c
@@ -18,12 +18,12 @@
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/irq.h>
+#include <linux/sched_clock.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
/* Generic stuff */
-#include <asm/sched_clock.h>
#include <asm/mach/map.h>
#include <asm/mach/time.h>
diff --git a/arch/arm/plat-iop/time.c b/arch/arm/plat-iop/time.c
index 837a2d52e9db3..29606bd75f3f1 100644
--- a/arch/arm/plat-iop/time.c
+++ b/arch/arm/plat-iop/time.c
@@ -22,9 +22,9 @@
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/export.h>
+#include <linux/sched_clock.h>
#include <mach/hardware.h>
#include <asm/irq.h>
-#include <asm/sched_clock.h>
#include <asm/uaccess.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
diff --git a/arch/arm/plat-omap/counter_32k.c b/arch/arm/plat-omap/counter_32k.c
index 5b0b86bb34bb8..d9bc98eb2a6b6 100644
--- a/arch/arm/plat-omap/counter_32k.c
+++ b/arch/arm/plat-omap/counter_32k.c
@@ -18,9 +18,9 @@
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clocksource.h>
+#include <linux/sched_clock.h>
#include <asm/mach/time.h>
-#include <asm/sched_clock.h>
#include <plat/counter-32k.h>
diff --git a/arch/arm/plat-orion/time.c b/arch/arm/plat-orion/time.c
index 5d5ac0f05422a..9d2b2ac74938d 100644
--- a/arch/arm/plat-orion/time.c
+++ b/arch/arm/plat-orion/time.c
@@ -16,7 +16,7 @@
#include <linux/clockchips.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
-#include <asm/sched_clock.h>
+#include <linux/sched_clock.h>
/*
* MBus bridge block registers.
diff --git a/arch/arm/plat-samsung/samsung-time.c b/arch/arm/plat-samsung/samsung-time.c
index f899cbc9b2883..2957075ca836f 100644
--- a/arch/arm/plat-samsung/samsung-time.c
+++ b/arch/arm/plat-samsung/samsung-time.c
@@ -15,12 +15,12 @@
#include <linux/clk.h>
#include <linux/clockchips.h>
#include <linux/platform_device.h>
+#include <linux/sched_clock.h>
#include <asm/smp_twd.h>
#include <asm/mach/time.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
-#include <asm/sched_clock.h>
#include <mach/map.h>
#include <plat/devs.h>
diff --git a/arch/arm/plat-versatile/sched-clock.c b/arch/arm/plat-versatile/sched-clock.c
index b33b74c872326..51b109e3b6c38 100644
--- a/arch/arm/plat-versatile/sched-clock.c
+++ b/arch/arm/plat-versatile/sched-clock.c
@@ -20,8 +20,8 @@
*/
#include <linux/kernel.h>
#include <linux/io.h>
+#include <linux/sched_clock.h>
-#include <asm/sched_clock.h>
#include <plat/sched_clock.h>
static void __iomem *ctr;
diff --git a/drivers/clocksource/bcm2835_timer.c b/drivers/clocksource/bcm2835_timer.c
index 766611d299455..07ea7ce900dc1 100644
--- a/drivers/clocksource/bcm2835_timer.c
+++ b/drivers/clocksource/bcm2835_timer.c
@@ -28,8 +28,8 @@
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/string.h>
+#include <linux/sched_clock.h>
-#include <asm/sched_clock.h>
#include <asm/irq.h>
#define REG_CONTROL 0x00
diff --git a/drivers/clocksource/clksrc-dbx500-prcmu.c b/drivers/clocksource/clksrc-dbx500-prcmu.c
index 54f3d119d99c7..0a7fb2440e290 100644
--- a/drivers/clocksource/clksrc-dbx500-prcmu.c
+++ b/drivers/clocksource/clksrc-dbx500-prcmu.c
@@ -14,8 +14,7 @@
*/
#include <linux/clockchips.h>
#include <linux/clksrc-dbx500-prcmu.h>
-
-#include <asm/sched_clock.h>
+#include <linux/sched_clock.h>
#define RATE_32K 32768
diff --git a/drivers/clocksource/dw_apb_timer_of.c b/drivers/clocksource/dw_apb_timer_of.c
index af13b8559b613..a97b4065dacfb 100644
--- a/drivers/clocksource/dw_apb_timer_of.c
+++ b/drivers/clocksource/dw_apb_timer_of.c
@@ -20,8 +20,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
-
-#include <asm/sched_clock.h>
+#include <linux/sched_clock.h>
static void timer_get_base_and_rate(struct device_node *np,
void __iomem **base, u32 *rate)
diff --git a/drivers/clocksource/mxs_timer.c b/drivers/clocksource/mxs_timer.c
index 02af4204af867..0f5e65f74dc3e 100644
--- a/drivers/clocksource/mxs_timer.c
+++ b/drivers/clocksource/mxs_timer.c
@@ -29,9 +29,9 @@
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/stmp_device.h>
+#include <linux/sched_clock.h>
#include <asm/mach/time.h>
-#include <asm/sched_clock.h>
/*
* There are 2 versions of the timrot on Freescale MXS-based SoCs.
diff --git a/drivers/clocksource/nomadik-mtu.c b/drivers/clocksource/nomadik-mtu.c
index e405531e1cc5c..8864c17841c86 100644
--- a/drivers/clocksource/nomadik-mtu.c
+++ b/drivers/clocksource/nomadik-mtu.c
@@ -18,8 +18,8 @@
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/platform_data/clocksource-nomadik-mtu.h>
+#include <linux/sched_clock.h>
#include <asm/mach/time.h>
-#include <asm/sched_clock.h>
/*
* The MTU device hosts four different counters, with 4 set of
diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c
index 0234c8d2c8f26..584b5472eea3e 100644
--- a/drivers/clocksource/samsung_pwm_timer.c
+++ b/drivers/clocksource/samsung_pwm_timer.c
@@ -21,10 +21,10 @@
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
+#include <linux/sched_clock.h>
#include <clocksource/samsung_pwm.h>
-#include <asm/sched_clock.h>
/*
* Clocksource driver
diff --git a/drivers/clocksource/tegra20_timer.c b/drivers/clocksource/tegra20_timer.c
index ae877b021b544..93961703b887e 100644
--- a/drivers/clocksource/tegra20_timer.c
+++ b/drivers/clocksource/tegra20_timer.c
@@ -26,10 +26,10 @@
#include <linux/io.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
+#include <linux/sched_clock.h>
#include <asm/mach/time.h>
#include <asm/smp_twd.h>
-#include <asm/sched_clock.h>
#define RTC_SECONDS 0x08
#define RTC_SHADOW_SECONDS 0x0c
diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c
index 47a673070d70e..efdca3263afef 100644
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -27,8 +27,8 @@
#include <linux/of_address.h>
#include <linux/irq.h>
#include <linux/module.h>
+#include <linux/sched_clock.h>
-#include <asm/sched_clock.h>
#include <asm/localtimer.h>
#include <linux/percpu.h>
/*
diff --git a/drivers/clocksource/timer-marco.c b/drivers/clocksource/timer-marco.c
index 97738dbf3e3bc..e5dc9129ca263 100644
--- a/drivers/clocksource/timer-marco.c
+++ b/drivers/clocksource/timer-marco.c
@@ -17,7 +17,7 @@
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
-#include <asm/sched_clock.h>
+#include <linux/sched_clock.h>
#include <asm/localtimer.h>
#include <asm/mach/time.h>
diff --git a/drivers/clocksource/timer-prima2.c b/drivers/clocksource/timer-prima2.c
index 760882665d7a4..ef3cfb269d8bc 100644
--- a/drivers/clocksource/timer-prima2.c
+++ b/drivers/clocksource/timer-prima2.c
@@ -18,7 +18,7 @@
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
-#include <asm/sched_clock.h>
+#include <linux/sched_clock.h>
#include <asm/mach/time.h>
#define SIRFSOC_TIMER_COUNTER_LO 0x0000
diff --git a/include/linux/sched_clock.h b/include/linux/sched_clock.h
new file mode 100644
index 0000000000000..fa7922c80a419
--- /dev/null
+++ b/include/linux/sched_clock.h
@@ -0,0 +1,21 @@
+/*
+ * sched_clock.h: support for extending counters to full 64-bit ns counter
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef LINUX_SCHED_CLOCK
+#define LINUX_SCHED_CLOCK
+
+#ifdef CONFIG_GENERIC_SCHED_CLOCK
+extern void sched_clock_postinit(void);
+#else
+static inline void sched_clock_postinit(void) { }
+#endif
+
+extern void setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate);
+
+extern unsigned long long (*sched_clock_func)(void);
+
+#endif
diff --git a/init/Kconfig b/init/Kconfig
index 9d3a7887a6d3e..1a3f93329a67b 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -757,6 +757,9 @@ config LOG_BUF_SHIFT
config HAVE_UNSTABLE_SCHED_CLOCK
bool
+config GENERIC_SCHED_CLOCK
+ bool
+
#
# For architectures that want to enable the support for NUMA-affine scheduler
# balancing logic:
diff --git a/init/main.c b/init/main.c
index 9484f4ba88d05..bef4a6ac7c76d 100644
--- a/init/main.c
+++ b/init/main.c
@@ -74,6 +74,7 @@
#include <linux/ptrace.h>
#include <linux/blkdev.h>
#include <linux/elevator.h>
+#include <linux/sched_clock.h>
#include <asm/io.h>
#include <asm/bugs.h>
@@ -555,6 +556,7 @@ asmlinkage void __init start_kernel(void)
softirq_init();
timekeeping_init();
time_init();
+ sched_clock_postinit();
profile_init();
call_function_init();
WARN(!irqs_disabled(), "Interrupts were enabled early\n");
diff --git a/kernel/time/Makefile b/kernel/time/Makefile
index d52ac8bf0006e..9250130646f51 100644
--- a/kernel/time/Makefile
+++ b/kernel/time/Makefile
@@ -4,6 +4,7 @@ obj-y += timeconv.o posix-clock.o alarmtimer.o
obj-$(CONFIG_GENERIC_CLOCKEVENTS_BUILD) += clockevents.o
obj-$(CONFIG_GENERIC_CLOCKEVENTS) += tick-common.o
obj-$(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) += tick-broadcast.o
+obj-$(CONFIG_GENERIC_SCHED_CLOCK) += sched_clock.o
obj-$(CONFIG_TICK_ONESHOT) += tick-oneshot.o
obj-$(CONFIG_TICK_ONESHOT) += tick-sched.o
obj-$(CONFIG_TIMER_STATS) += timer_stats.o
diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c
new file mode 100644
index 0000000000000..aad1ae6077ef4
--- /dev/null
+++ b/kernel/time/sched_clock.c
@@ -0,0 +1,215 @@
+/*
+ * sched_clock.c: support for extending counters to full 64-bit ns counter
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/clocksource.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/moduleparam.h>
+#include <linux/sched.h>
+#include <linux/syscore_ops.h>
+#include <linux/timer.h>
+#include <linux/sched_clock.h>
+
+struct clock_data {
+ u64 epoch_ns;
+ u32 epoch_cyc;
+ u32 epoch_cyc_copy;
+ unsigned long rate;
+ u32 mult;
+ u32 shift;
+ bool suspended;
+};
+
+static void sched_clock_poll(unsigned long wrap_ticks);
+static DEFINE_TIMER(sched_clock_timer, sched_clock_poll, 0, 0);
+static int irqtime = -1;
+
+core_param(irqtime, irqtime, int, 0400);
+
+static struct clock_data cd = {
+ .mult = NSEC_PER_SEC / HZ,
+};
+
+static u32 __read_mostly sched_clock_mask = 0xffffffff;
+
+static u32 notrace jiffy_sched_clock_read(void)
+{
+ return (u32)(jiffies - INITIAL_JIFFIES);
+}
+
+static u32 __read_mostly (*read_sched_clock)(void) = jiffy_sched_clock_read;
+
+static inline u64 notrace cyc_to_ns(u64 cyc, u32 mult, u32 shift)
+{
+ return (cyc * mult) >> shift;
+}
+
+static unsigned long long notrace cyc_to_sched_clock(u32 cyc, u32 mask)
+{
+ u64 epoch_ns;
+ u32 epoch_cyc;
+
+ /*
+ * Load the epoch_cyc and epoch_ns atomically. We do this by
+ * ensuring that we always write epoch_cyc, epoch_ns and
+ * epoch_cyc_copy in strict order, and read them in strict order.
+ * If epoch_cyc and epoch_cyc_copy are not equal, then we're in
+ * the middle of an update, and we should repeat the load.
+ */
+ do {
+ epoch_cyc = cd.epoch_cyc;
+ smp_rmb();
+ epoch_ns = cd.epoch_ns;
+ smp_rmb();
+ } while (epoch_cyc != cd.epoch_cyc_copy);
+
+ return epoch_ns + cyc_to_ns((cyc - epoch_cyc) & mask, cd.mult, cd.shift);
+}
+
+/*
+ * Atomically update the sched_clock epoch.
+ */
+static void notrace update_sched_clock(void)
+{
+ unsigned long flags;
+ u32 cyc;
+ u64 ns;
+
+ cyc = read_sched_clock();
+ ns = cd.epoch_ns +
+ cyc_to_ns((cyc - cd.epoch_cyc) & sched_clock_mask,
+ cd.mult, cd.shift);
+ /*
+ * Write epoch_cyc and epoch_ns in a way that the update is
+ * detectable in cyc_to_fixed_sched_clock().
+ */
+ raw_local_irq_save(flags);
+ cd.epoch_cyc_copy = cyc;
+ smp_wmb();
+ cd.epoch_ns = ns;
+ smp_wmb();
+ cd.epoch_cyc = cyc;
+ raw_local_irq_restore(flags);
+}
+
+static void sched_clock_poll(unsigned long wrap_ticks)
+{
+ mod_timer(&sched_clock_timer, round_jiffies(jiffies + wrap_ticks));
+ update_sched_clock();
+}
+
+void __init setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate)
+{
+ unsigned long r, w;
+ u64 res, wrap;
+ char r_unit;
+
+ if (cd.rate > rate)
+ return;
+
+ BUG_ON(bits > 32);
+ WARN_ON(!irqs_disabled());
+ read_sched_clock = read;
+ sched_clock_mask = (1 << bits) - 1;
+ cd.rate = rate;
+
+ /* calculate the mult/shift to convert counter ticks to ns. */
+ clocks_calc_mult_shift(&cd.mult, &cd.shift, rate, NSEC_PER_SEC, 0);
+
+ r = rate;
+ if (r >= 4000000) {
+ r /= 1000000;
+ r_unit = 'M';
+ } else if (r >= 1000) {
+ r /= 1000;
+ r_unit = 'k';
+ } else
+ r_unit = ' ';
+
+ /* calculate how many ns until we wrap */
+ wrap = cyc_to_ns((1ULL << bits) - 1, cd.mult, cd.shift);
+ do_div(wrap, NSEC_PER_MSEC);
+ w = wrap;
+
+ /* calculate the ns resolution of this counter */
+ res = cyc_to_ns(1ULL, cd.mult, cd.shift);
+ pr_info("sched_clock: %u bits at %lu%cHz, resolution %lluns, wraps every %lums\n",
+ bits, r, r_unit, res, w);
+
+ /*
+ * Start the timer to keep sched_clock() properly updated and
+ * sets the initial epoch.
+ */
+ sched_clock_timer.data = msecs_to_jiffies(w - (w / 10));
+ update_sched_clock();
+
+ /*
+ * Ensure that sched_clock() starts off at 0ns
+ */
+ cd.epoch_ns = 0;
+
+ /* Enable IRQ time accounting if we have a fast enough sched_clock */
+ if (irqtime > 0 || (irqtime == -1 && rate >= 1000000))
+ enable_sched_clock_irqtime();
+
+ pr_debug("Registered %pF as sched_clock source\n", read);
+}
+
+static unsigned long long notrace sched_clock_32(void)
+{
+ u32 cyc = read_sched_clock();
+ return cyc_to_sched_clock(cyc, sched_clock_mask);
+}
+
+unsigned long long __read_mostly (*sched_clock_func)(void) = sched_clock_32;
+
+unsigned long long notrace sched_clock(void)
+{
+ if (cd.suspended)
+ return cd.epoch_ns;
+
+ return sched_clock_func();
+}
+
+void __init sched_clock_postinit(void)
+{
+ /*
+ * If no sched_clock function has been provided at that point,
+ * make it the final one one.
+ */
+ if (read_sched_clock == jiffy_sched_clock_read)
+ setup_sched_clock(jiffy_sched_clock_read, 32, HZ);
+
+ sched_clock_poll(sched_clock_timer.data);
+}
+
+static int sched_clock_suspend(void)
+{
+ sched_clock_poll(sched_clock_timer.data);
+ cd.suspended = true;
+ return 0;
+}
+
+static void sched_clock_resume(void)
+{
+ cd.epoch_cyc = read_sched_clock();
+ cd.epoch_cyc_copy = cd.epoch_cyc;
+ cd.suspended = false;
+}
+
+static struct syscore_ops sched_clock_ops = {
+ .suspend = sched_clock_suspend,
+ .resume = sched_clock_resume,
+};
+
+static int __init sched_clock_syscore_init(void)
+{
+ register_syscore_ops(&sched_clock_ops);
+ return 0;
+}
+device_initcall(sched_clock_syscore_init);