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Subject[PATCH v4 05/17] arch_timer: Move to generic sched_clock framework
Date
Register with the generic sched_clock framework now that it
supports 64 bits. This fixes two problems with the current
sched_clock support for machines using the architected timers.
First off, we don't subtract the start value from subsequent
sched_clock calls so we can potentially start off with
sched_clock returning gigantic numbers. Second, there is no
support for suspend/resume handling so problems such as discussed
in 6a4dae5 (ARM: 7565/1: sched: stop sched_clock() during
suspend, 2012-10-23) can happen without this patch. Finally, it
allows us to move the sched_clock setup into drivers clocksource
out of the arch ports.

Cc: Christopher Covington <cov@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
arch/arm/kernel/arch_timer.c | 14 --------------
arch/arm64/Kconfig | 1 +
arch/arm64/kernel/time.c | 10 ----------
drivers/clocksource/arm_arch_timer.c | 4 ++++
4 files changed, 5 insertions(+), 24 deletions(-)

diff --git a/arch/arm/kernel/arch_timer.c b/arch/arm/kernel/arch_timer.c
index 221f07b..1791f12 100644
--- a/arch/arm/kernel/arch_timer.c
+++ b/arch/arm/kernel/arch_timer.c
@@ -11,7 +11,6 @@
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
-#include <linux/sched_clock.h>

#include <asm/delay.h>

@@ -22,13 +21,6 @@ static unsigned long arch_timer_read_counter_long(void)
return arch_timer_read_counter();
}

-static u32 sched_clock_mult __read_mostly;
-
-static unsigned long long notrace arch_timer_sched_clock(void)
-{
- return arch_timer_read_counter() * sched_clock_mult;
-}
-
static struct delay_timer arch_delay_timer;

static void __init arch_timer_delay_timer_register(void)
@@ -48,11 +40,5 @@ int __init arch_timer_arch_init(void)

arch_timer_delay_timer_register();

- /* Cache the sched_clock multiplier to save a divide in the hot path. */
- sched_clock_mult = NSEC_PER_SEC / arch_timer_rate;
- sched_clock_func = arch_timer_sched_clock;
- pr_info("sched_clock: ARM arch timer >56 bits at %ukHz, resolution %uns\n",
- arch_timer_rate / 1000, sched_clock_mult);
-
return 0;
}
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 9737e97..e32b471 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -14,6 +14,7 @@ config ARM64
select GENERIC_IOMAP
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
+ select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
select GENERIC_TIME_VSYSCALL
select HARDIRQS_SW_RESEND
diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c
index 03dc371..29c39d5 100644
--- a/arch/arm64/kernel/time.c
+++ b/arch/arm64/kernel/time.c
@@ -61,13 +61,6 @@ unsigned long profile_pc(struct pt_regs *regs)
EXPORT_SYMBOL(profile_pc);
#endif

-static u64 sched_clock_mult __read_mostly;
-
-unsigned long long notrace sched_clock(void)
-{
- return arch_timer_read_counter() * sched_clock_mult;
-}
-
void __init time_init(void)
{
u32 arch_timer_rate;
@@ -78,9 +71,6 @@ void __init time_init(void)
if (!arch_timer_rate)
panic("Unable to initialise architected timer.\n");

- /* Cache the sched_clock multiplier to save a divide in the hot path. */
- sched_clock_mult = NSEC_PER_SEC / arch_timer_rate;
-
/* Calibrate the delay loop directly */
lpj_fine = arch_timer_rate / HZ;
}
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 053d846..2facf14 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -17,6 +17,7 @@
#include <linux/interrupt.h>
#include <linux/of_irq.h>
#include <linux/io.h>
+#include <linux/sched_clock.h>

#include <asm/arch_timer.h>
#include <asm/virt.h>
@@ -281,6 +282,9 @@ static int __init arch_timer_register(void)
timecounter_init(&timecounter, &cyclecounter,
arch_counter_get_cntvct());

+ /* 56 bits minimum, so we assume worst case rollover */
+ sched_clock_register(arch_timer_read_counter, 56, arch_timer_rate);
+
if (arch_timer_use_virtual) {
ppi = arch_timer_ppi[VIRT_PPI];
err = request_percpu_irq(ppi, arch_timer_handler_virt,
--
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