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Subject[PATCH 01/10] x86: Convert untested clocksources to clocksource_register_hz/khz
Date
This converts the remaining x86 clocksources to use
clocksource_register_hz/khz. I was not able to test them, so
any extra assistance to make sure time functions properly with
the clocksources changeed here would be appreciated!

CC: jacob.jun.pan@intel.com
CC: Glauber Costa <glommer@redhat.com>
CC: Dimitri Sivanich <sivanich@sgi.com>
CC: Rusty Russell <rusty@rustcorp.com.au>
CC: Jeremy Fitzhardinge <jeremy@xensource.com>
CC: Chris McDermott <lcm@us.ibm.com>
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <johnstul@us.ibm.com>
---
arch/x86/kernel/apb_timer.c | 10 +---------
arch/x86/kernel/i8253.c | 6 +-----
arch/x86/kernel/kvmclock.c | 6 +-----
arch/x86/lguest/boot.c | 4 +---
arch/x86/platform/uv/uv_time.c | 6 +-----
arch/x86/xen/time.c | 6 +-----
drivers/clocksource/cyclone.c | 10 ++--------
7 files changed, 8 insertions(+), 40 deletions(-)
diff --git a/arch/x86/kernel/apb_timer.c b/arch/x86/kernel/apb_timer.c
index 92543c7..2734428 100644
--- a/arch/x86/kernel/apb_timer.c
+++ b/arch/x86/kernel/apb_timer.c
@@ -177,7 +177,6 @@ static struct clocksource clocksource_apbt = {
.rating = APBT_CLOCKSOURCE_RATING,
.read = apbt_read_clocksource,
.mask = APBT_MASK,
- .shift = APBT_SHIFT,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
.resume = apbt_restart_clocksource,
};
@@ -592,14 +591,7 @@ static int apbt_clocksource_register(void)
if (t1 == apbt_read_clocksource(&clocksource_apbt))
panic("APBT counter not counting. APBT disabled\n");

- /*
- * initialize and register APBT clocksource
- * convert that to ns/clock cycle
- * mult = (ns/c) * 2^APBT_SHIFT
- */
- clocksource_apbt.mult = div_sc(MSEC_PER_SEC,
- (unsigned long) apbt_freq, APBT_SHIFT);
- clocksource_register(&clocksource_apbt);
+ clocksource_register_khz(&clocksource_apbt,(u32)apbt_freq*1000);

return 0;
}
diff --git a/arch/x86/kernel/i8253.c b/arch/x86/kernel/i8253.c
index 2dfd315..212fe65 100644
--- a/arch/x86/kernel/i8253.c
+++ b/arch/x86/kernel/i8253.c
@@ -188,8 +188,6 @@ static struct clocksource pit_cs = {
.rating = 110,
.read = pit_read,
.mask = CLOCKSOURCE_MASK(32),
- .mult = 0,
- .shift = 20,
};

static int __init init_pit_clocksource(void)
@@ -205,9 +203,7 @@ static int __init init_pit_clocksource(void)
pit_ce.mode != CLOCK_EVT_MODE_PERIODIC)
return 0;

- pit_cs.mult = clocksource_hz2mult(CLOCK_TICK_RATE, pit_cs.shift);
-
- return clocksource_register(&pit_cs);
+ return clocksource_register_hz(&pit_cs, CLOCK_TICK_RATE);
}
arch_initcall(init_pit_clocksource);

diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index ca43ce3..8e50e68 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -26,8 +26,6 @@
#include <asm/x86_init.h>
#include <asm/reboot.h>

-#define KVM_SCALE 22
-
static int kvmclock = 1;
static int msr_kvm_system_time = MSR_KVM_SYSTEM_TIME;
static int msr_kvm_wall_clock = MSR_KVM_WALL_CLOCK;
@@ -120,8 +118,6 @@ static struct clocksource kvm_clock = {
.read = kvm_clock_get_cycles,
.rating = 400,
.mask = CLOCKSOURCE_MASK(64),
- .mult = 1 << KVM_SCALE,
- .shift = KVM_SCALE,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};

@@ -214,7 +210,7 @@ void __init kvmclock_init(void)
machine_ops.crash_shutdown = kvm_crash_shutdown;
#endif
kvm_get_preset_lpj();
- clocksource_register(&kvm_clock);
+ clocksource_register_hz(&kvm_clock, NSEC_PER_SEC);
pv_info.paravirt_enabled = 1;
pv_info.name = "KVM";

diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index 73b1e1a..483e636 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -910,8 +910,6 @@ static struct clocksource lguest_clock = {
.rating = 200,
.read = lguest_clock_read,
.mask = CLOCKSOURCE_MASK(64),
- .mult = 1 << 22,
- .shift = 22,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};

@@ -994,7 +992,7 @@ static void lguest_time_init(void)
/* Set up the timer interrupt (0) to go to our simple timer routine */
set_irq_handler(0, lguest_time_irq);

- clocksource_register(&lguest_clock);
+ clocksource_register_hz(&lguest_clock, NSEC_PER_SEC);

/* We can't set cpumask in the initializer: damn C limitations! Set it
* here and register our timer device. */
diff --git a/arch/x86/platform/uv/uv_time.c b/arch/x86/platform/uv/uv_time.c
index 56e421b..6f86d74 100644
--- a/arch/x86/platform/uv/uv_time.c
+++ b/arch/x86/platform/uv/uv_time.c
@@ -40,7 +40,6 @@ static struct clocksource clocksource_uv = {
.rating = 400,
.read = uv_read_rtc,
.mask = (cycle_t)UVH_RTC_REAL_TIME_CLOCK_MASK,
- .shift = 10,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};

@@ -370,14 +369,11 @@ static __init int uv_rtc_setup_clock(void)
if (!is_uv_system())
return -ENODEV;

- clocksource_uv.mult = clocksource_hz2mult(sn_rtc_cycles_per_second,
- clocksource_uv.shift);
-
/* If single blade, prefer tsc */
if (uv_num_possible_blades() == 1)
clocksource_uv.rating = 250;

- rc = clocksource_register(&clocksource_uv);
+ rc = clocksource_register_hz(&clocksource_uv, sn_rtc_cycles_per_second);
if (rc)
printk(KERN_INFO "UV RTC clocksource failed rc %d\n", rc);
else
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index b2bb5aa..ce02ef8 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -26,8 +26,6 @@

#include "xen-ops.h"

-#define XEN_SHIFT 22
-
/* Xen may fire a timer up to this many ns early */
#define TIMER_SLOP 100000
#define NS_PER_TICK (1000000000LL / HZ)
@@ -211,8 +209,6 @@ static struct clocksource xen_clocksource __read_mostly = {
.rating = 400,
.read = xen_clocksource_get_cycles,
.mask = ~0,
- .mult = 1<<XEN_SHIFT, /* time directly in nanoseconds */
- .shift = XEN_SHIFT,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};

@@ -444,7 +440,7 @@ static __init void xen_time_init(void)
int cpu = smp_processor_id();
struct timespec tp;

- clocksource_register(&xen_clocksource);
+ clocksource_register_hz(&xen_clocksource, NSEC_PER_SEC);

if (HYPERVISOR_vcpu_op(VCPUOP_stop_periodic_timer, cpu, NULL) == 0) {
/* Successfully turned off 100Hz tick, so we have the
diff --git a/drivers/clocksource/cyclone.c b/drivers/clocksource/cyclone.c
index 64e528e..72f811f 100644
--- a/drivers/clocksource/cyclone.c
+++ b/drivers/clocksource/cyclone.c
@@ -29,8 +29,6 @@ static struct clocksource clocksource_cyclone = {
.rating = 250,
.read = read_cyclone,
.mask = CYCLONE_TIMER_MASK,
- .mult = 10,
- .shift = 0,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};

@@ -108,12 +106,8 @@ static int __init init_cyclone_clocksource(void)
}
cyclone_ptr = cyclone_timer;

- /* sort out mult/shift values: */
- clocksource_cyclone.shift = 22;
- clocksource_cyclone.mult = clocksource_hz2mult(CYCLONE_TIMER_FREQ,
- clocksource_cyclone.shift);
-
- return clocksource_register(&clocksource_cyclone);
+ return clocksource_register_hz(&clocksource_cyclone,
+ CYCLONE_TIMER_FREQ);
}

arch_initcall(init_cyclone_clocksource);
--
1.7.3.2.146.gca209


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