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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 7/10] linux 2.6.18: time handling
Remove struct timer_opts left-overs, add a Xen clocksource, and adjust
conditionals for x86-64.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Index: head-2007-02-27/arch/i386/Kconfig
===================================================================
--- head-2007-02-27.orig/arch/i386/Kconfig 2007-03-05 10:00:18.000000000
+0100
+++ head-2007-02-27/arch/i386/Kconfig 2007-02-27 16:27:37.000000000 +0100
@@ -16,7 +16,6 @@ config X86_32
config GENERIC_TIME
bool
- depends on !X86_XEN
default y
config LOCKDEP_SUPPORT
Index: head-2007-02-27/arch/i386/kernel/Makefile
===================================================================
--- head-2007-02-27.orig/arch/i386/kernel/Makefile 2007-03-05
10:00:18.000000000 +0100
+++ head-2007-02-27/arch/i386/kernel/Makefile 2007-02-27 16:27:37.000000000
+0100
@@ -93,7 +93,7 @@ include $(srctree)/scripts/Makefile.xen
obj-y += fixup.o
microcode-$(subst m,y,$(CONFIG_MICROCODE)) := microcode-xen.o
-n-obj-xen := i8259.o timers/ reboot.o smpboot.o trampoline.o
+n-obj-xen := i8259.o reboot.o smpboot.o trampoline.o tsc.o
obj-y := $(call filterxen, $(obj-y), $(n-obj-xen))
obj-y := $(call cherrypickxen, $(obj-y))
Index: head-2007-02-27/arch/i386/kernel/time-xen.c
===================================================================
--- head-2007-02-27.orig/arch/i386/kernel/time-xen.c 2007-03-05
10:00:18.000000000 +0100
+++ head-2007-02-27/arch/i386/kernel/time-xen.c 2007-02-27 16:27:37.000000000
+0100
@@ -96,10 +96,6 @@ extern unsigned long wall_jiffies;
DEFINE_SPINLOCK(rtc_lock);
EXPORT_SYMBOL(rtc_lock);
-extern struct init_timer_opts timer_tsc_init;
-extern struct timer_opts timer_tsc;
-#define timer_none timer_tsc
-
/* These are peridically updated in shared_info, and then copied here. */
struct shadow_time_info {
u64 tsc_timestamp; /* TSC at last update of time vals. */
@@ -238,6 +234,7 @@ static u64 get_nsec_offset(struct shadow
return scale_delta(delta, shadow->tsc_to_nsec_mul, shadow->tsc_shift);
}
+#ifdef CONFIG_X86_64
static unsigned long get_usec_offset(struct shadow_time_info *shadow)
{
u64 now, delta;
@@ -245,6 +242,7 @@ static unsigned long get_usec_offset(str
delta = now - shadow->tsc_timestamp;
return scale_delta(delta, shadow->tsc_to_usec_mul, shadow->tsc_shift);
}
+#endif
static void __update_wallclock(time_t sec, long nsec)
{
@@ -354,6 +352,8 @@ void rtc_cmos_write(unsigned char val, u
}
EXPORT_SYMBOL(rtc_cmos_write);
+#ifdef CONFIG_X86_64
+
/*
* This version of gettimeofday has microsecond resolution
* and better than microsecond precision on fast x86 machines with TSC.
@@ -482,6 +482,8 @@ int do_settimeofday(struct timespec *tv)
EXPORT_SYMBOL(do_settimeofday);
+#endif
+
static void sync_xen_wallclock(unsigned long dummy);
static DEFINE_TIMER(sync_xen_wallclock_timer, sync_xen_wallclock, 0, 0);
static void sync_xen_wallclock(unsigned long dummy)
@@ -533,11 +535,15 @@ static int set_rtc_mmss(unsigned long no
return retval;
}
+#ifdef CONFIG_X86_64
/* monotonic_clock(): returns # of nanoseconds passed since time_init()
* Note: This function is required to return accurate
* time even in the absence of multiple timer ticks.
*/
unsigned long long monotonic_clock(void)
+#else
+unsigned long long sched_clock(void)
+#endif
{
int cpu = get_cpu();
struct shadow_time_info *shadow = &per_cpu(shadow_time, cpu);
@@ -557,9 +563,9 @@ unsigned long long monotonic_clock(void)
return time;
}
+#ifdef CONFIG_X86_64
EXPORT_SYMBOL(monotonic_clock);
-#ifdef __x86_64__
unsigned long long sched_clock(void)
{
return monotonic_clock();
@@ -927,11 +933,11 @@ void __init time_init(void)
update_wallclock();
+#ifdef CONFIG_X86_64
init_cpu_khz();
printk(KERN_INFO "Xen reported: %u.%03u MHz processor.\n",
cpu_khz / 1000, cpu_khz % 1000);
-#if defined(__x86_64__)
vxtime.mode = VXTIME_TSC;
vxtime.quot = (1000000L << 32) / vxtime_hz;
vxtime.tsc_quot = (1000L << 32) / cpu_khz;
@@ -1074,6 +1080,58 @@ void local_teardown_timer(unsigned int c
}
#endif
+#ifndef CONFIG_X86_64
+
+void tsc_init(void)
+{
+ init_cpu_khz();
+ printk(KERN_INFO "Xen reported: %u.%03u MHz processor.\n",
+ cpu_khz / 1000, cpu_khz % 1000);
+
+ use_tsc_delay();
+}
+
+#include <linux/clocksource.h>
+
+void mark_tsc_unstable(void)
+{
+#ifndef CONFIG_XEN /* XXX Should tell the hypervisor about this fact. */
+ tsc_unstable = 1;
+#endif
+}
+EXPORT_SYMBOL_GPL(mark_tsc_unstable);
+
+static cycle_t read_tsc(void)
+{
+ cycle_t ret;
+
+ rdtscll(ret);
+
+ return ret;
+}
+
+static struct clocksource clocksource_xen = {
+ .name = "xen",
+ .rating = 300,
+ .read = read_tsc,
+ .mask = CLOCKSOURCE_MASK(64),
+ .mult = 0, /* to be set */
+ .shift = 22,
+ .is_continuous = 1,
+};
+
+static int __init init_xen_clocksource(void)
+{
+ clocksource_xen.mult = clocksource_khz2mult(cpu_khz,
+ clocksource_xen.shift);
+
+ return clocksource_register(&clocksource_xen);
+}
+
+module_init(init_xen_clocksource);
+
+#endif
+
/*
* /proc/sys/xen: This really belongs in another file. It can stay here for
* now however.
Index: head-2007-02-27/include/asm-i386/mach-xen/asm/processor.h
===================================================================
--- head-2007-02-27.orig/include/asm-i386/mach-xen/asm/processor.h
2007-03-05 10:00:18.000000000 +0100
+++ head-2007-02-27/include/asm-i386/mach-xen/asm/processor.h 2007-02-27
16:27:37.000000000 +0100
@@ -23,7 +23,7 @@
#include <xen/interface/physdev.h>
/* flag for disabling the tsc */
-extern int tsc_disable;
+#define tsc_disable 0
struct desc_struct {
unsigned long a,b;
Index: head-2007-02-27/include/asm-x86_64/mach-xen/asm/timer.h
===================================================================
--- head-2007-02-27.orig/include/asm-x86_64/mach-xen/asm/timer.h
2007-03-05 11:14:12.000000000 +0100
+++ head-2007-02-27/include/asm-x86_64/mach-xen/asm/timer.h 2007-03-05
11:14:28.000000000 +0100
@@ -2,39 +2,8 @@
#define _ASMi386_TIMER_H
#include <linux/init.h>
-/**
- * struct timer_ops - used to define a timer source
- *
- * @name: name of the timer.
- * @init: Probes and initializes the timer. Takes clock= override
- * string as an argument. Returns 0 on success, anything else
- * on failure.
- * @mark_offset: called by the timer interrupt.
- * @get_offset: called by gettimeofday(). Returns the number of microseconds
- * since the last timer interupt.
- * @monotonic_clock: returns the number of nanoseconds since the init of the
- * timer.
- * @delay: delays this many clock cycles.
- */
-struct timer_opts {
- char* name;
- void (*mark_offset)(void);
- unsigned long (*get_offset)(void);
- unsigned long long (*monotonic_clock)(void);
- void (*delay)(unsigned long);
- unsigned long (*read_timer)(void);
- int (*suspend)(pm_message_t state);
- int (*resume)(void);
-};
-
-struct init_timer_opts {
- int (*init)(char *override);
- struct timer_opts *opts;
-};
-
#define TICK_SIZE (tick_nsec / 1000)
-extern struct timer_opts* __init select_timer(void);
extern void clock_fallback(void);
void setup_pit_timer(void);
@@ -42,26 +11,13 @@ void setup_pit_timer(void);
extern int pit_latch_buggy;
-extern struct timer_opts *cur_timer;
extern int timer_ack;
/* list of externed timers */
-extern struct timer_opts timer_none;
-extern struct timer_opts timer_pit;
-extern struct init_timer_opts timer_pit_init;
-extern struct init_timer_opts timer_tsc_init;
-#ifdef CONFIG_X86_CYCLONE_TIMER
-extern struct init_timer_opts timer_cyclone_init;
-#endif
-
extern unsigned long calibrate_tsc(void);
extern void init_cpu_khz(void);
#ifdef CONFIG_HPET_TIMER
-extern struct init_timer_opts timer_hpet_init;
extern unsigned long calibrate_tsc_hpet(unsigned long *tsc_hpet_quotient_ptr);
#endif
-#ifdef CONFIG_X86_PM_TIMER
-extern struct init_timer_opts timer_pmtmr_init;
-#endif
#endif
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