1 files changed, 0 insertions, 478 deletions
diff --git a/arch/i386/kernel/tsc.c b/arch/i386/kernel/tsc.c
deleted file mode 100644
index 7e0d8dab207..00000000000
--- a/arch/i386/kernel/tsc.c
+++ /dev/null
@@ -1,478 +0,0 @@
-/*
- * This code largely moved from arch/i386/kernel/timer/timer_tsc.c
- * which was originally moved from arch/i386/kernel/time.c.
- * See comments there for proper credits.
- */
-
-#include <linux/clocksource.h>
-#include <linux/workqueue.h>
-#include <linux/cpufreq.h>
-#include <linux/jiffies.h>
-#include <linux/init.h>
-#include <linux/dmi.h>
-
-#include <asm/delay.h>
-#include <asm/tsc.h>
-#include <asm/delay.h>
-#include <asm/io.h>
-
-#include "mach_timer.h"
-
-/*
- * On some systems the TSC frequency does not
- * change with the cpu frequency. So we need
- * an extra value to store the TSC freq
- */
-unsigned int tsc_khz;
-
-int tsc_disable __cpuinitdata = 0;
-
-#ifdef CONFIG_X86_TSC
-static int __init tsc_setup(char *str)
-{
-	printk(KERN_WARNING "notsc: Kernel compiled with CONFIG_X86_TSC, "
-				"cannot disable TSC.\n");
-	return 1;
-}
-#else
-/*
- * disable flag for tsc. Takes effect by clearing the TSC cpu flag
- * in cpu/common.c
- */
-static int __init tsc_setup(char *str)
-{
-	tsc_disable = 1;
-
-	return 1;
-}
-#endif
-
-__setup("notsc", tsc_setup);
-
-/*
- * code to mark and check if the TSC is unstable
- * due to cpufreq or due to unsynced TSCs
- */
-static int tsc_unstable;
-
-static inline int check_tsc_unstable(void)
-{
-	return tsc_unstable;
-}
-
-void mark_tsc_unstable(void)
-{
-	tsc_unstable = 1;
-}
-EXPORT_SYMBOL_GPL(mark_tsc_unstable);
-
-/* Accellerators for sched_clock()
- * convert from cycles(64bits) => nanoseconds (64bits)
- *  basic equation:
- *		ns = cycles / (freq / ns_per_sec)
- *		ns = cycles * (ns_per_sec / freq)
- *		ns = cycles * (10^9 / (cpu_khz * 10^3))
- *		ns = cycles * (10^6 / cpu_khz)
- *
- *	Then we use scaling math (suggested by george@mvista.com) to get:
- *		ns = cycles * (10^6 * SC / cpu_khz) / SC
- *		ns = cycles * cyc2ns_scale / SC
- *
- *	And since SC is a constant power of two, we can convert the div
- *  into a shift.
- *
- *  We can use khz divisor instead of mhz to keep a better percision, since
- *  cyc2ns_scale is limited to 10^6 * 2^10, which fits in 32 bits.
- *  (mathieu.desnoyers@polymtl.ca)
- *
- *			-johnstul@us.ibm.com "math is hard, lets go shopping!"
- */
-static unsigned long cyc2ns_scale __read_mostly;
-
-#define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */
-
-static inline void set_cyc2ns_scale(unsigned long cpu_khz)
-{
-	cyc2ns_scale = (1000000 << CYC2NS_SCALE_FACTOR)/cpu_khz;
-}
-
-static inline unsigned long long cycles_2_ns(unsigned long long cyc)
-{
-	return (cyc * cyc2ns_scale) >> CYC2NS_SCALE_FACTOR;
-}
-
-/*
- * Scheduler clock - returns current time in nanosec units.
- */
-unsigned long long sched_clock(void)
-{
-	unsigned long long this_offset;
-
-	/*
-	 * in the NUMA case we dont use the TSC as they are not
-	 * synchronized across all CPUs.
-	 */
-#ifndef CONFIG_NUMA
-	if (!cpu_khz || check_tsc_unstable())
-#endif
-		/* no locking but a rare wrong value is not a big deal */
-		return (jiffies_64 - INITIAL_JIFFIES) * (1000000000 / HZ);
-
-	/* read the Time Stamp Counter: */
-	rdtscll(this_offset);
-
-	/* return the value in ns */
-	return cycles_2_ns(this_offset);
-}
-
-static unsigned long calculate_cpu_khz(void)
-{
-	unsigned long long start, end;
-	unsigned long count;
-	u64 delta64;
-	int i;
-	unsigned long flags;
-
-	local_irq_save(flags);
-
-	/* run 3 times to ensure the cache is warm */
-	for (i = 0; i < 3; i++) {
-		mach_prepare_counter();
-		rdtscll(start);
-		mach_countup(&count);
-		rdtscll(end);
-	}
-	/*
-	 * Error: ECTCNEVERSET
-	 * The CTC wasn't reliable: we got a hit on the very first read,
-	 * or the CPU was so fast/slow that the quotient wouldn't fit in
-	 * 32 bits..
-	 */
-	if (count <= 1)
-		goto err;
-
-	delta64 = end - start;
-
-	/* cpu freq too fast: */
-	if (delta64 > (1ULL<<32))
-		goto err;
-
-	/* cpu freq too slow: */
-	if (delta64 <= CALIBRATE_TIME_MSEC)
-		goto err;
-
-	delta64 += CALIBRATE_TIME_MSEC/2; /* round for do_div */
-	do_div(delta64,CALIBRATE_TIME_MSEC);
-
-	local_irq_restore(flags);
-	return (unsigned long)delta64;
-err:
-	local_irq_restore(flags);
-	return 0;
-}
-
-int recalibrate_cpu_khz(void)
-{
-#ifndef CONFIG_SMP
-	unsigned long cpu_khz_old = cpu_khz;
-
-	if (cpu_has_tsc) {
-		cpu_khz = calculate_cpu_khz();
-		tsc_khz = cpu_khz;
-		cpu_data[0].loops_per_jiffy =
-			cpufreq_scale(cpu_data[0].loops_per_jiffy,
-					cpu_khz_old, cpu_khz);
-		return 0;
-	} else
-		return -ENODEV;
-#else
-	return -ENODEV;
-#endif
-}
-
-EXPORT_SYMBOL(recalibrate_cpu_khz);
-
-void tsc_init(void)
-{
-	if (!cpu_has_tsc || tsc_disable)
-		return;
-
-	cpu_khz = calculate_cpu_khz();
-	tsc_khz = cpu_khz;
-
-	if (!cpu_khz)
-		return;
-
-	printk("Detected %lu.%03lu MHz processor.\n",
-				(unsigned long)cpu_khz / 1000,
-				(unsigned long)cpu_khz % 1000);
-
-	set_cyc2ns_scale(cpu_khz);
-	use_tsc_delay();
-}
-
-#ifdef CONFIG_CPU_FREQ
-
-static unsigned int cpufreq_delayed_issched = 0;
-static unsigned int cpufreq_init = 0;
-static struct work_struct cpufreq_delayed_get_work;
-
-static void handle_cpufreq_delayed_get(void *v)
-{
-	unsigned int cpu;
-
-	for_each_online_cpu(cpu)
-		cpufreq_get(cpu);
-
-	cpufreq_delayed_issched = 0;
-}
-
-/*
- * if we notice cpufreq oddness, schedule a call to cpufreq_get() as it tries
- * to verify the CPU frequency the timing core thinks the CPU is running
- * at is still correct.
- */
-static inline void cpufreq_delayed_get(void)
-{
-	if (cpufreq_init && !cpufreq_delayed_issched) {
-		cpufreq_delayed_issched = 1;
-		printk(KERN_DEBUG "Checking if CPU frequency changed.\n");
-		schedule_work(&cpufreq_delayed_get_work);
-	}
-}
-
-/*
- * if the CPU frequency is scaled, TSC-based delays will need a different
- * loops_per_jiffy value to function properly.
- */
-static unsigned int ref_freq = 0;
-static unsigned long loops_per_jiffy_ref = 0;
-static unsigned long cpu_khz_ref = 0;
-
-static int
-time_cpufreq_notifier(struct notifier_block *nb, unsigned long val, void *data)
-{
-	struct cpufreq_freqs *freq = data;
-
-	if (val != CPUFREQ_RESUMECHANGE && val != CPUFREQ_SUSPENDCHANGE)
-		write_seqlock_irq(&xtime_lock);
-
-	if (!ref_freq) {
-		if (!freq->old){
-			ref_freq = freq->new;
-			goto end;
-		}
-		ref_freq = freq->old;
-		loops_per_jiffy_ref = cpu_data[freq->cpu].loops_per_jiffy;
-		cpu_khz_ref = cpu_khz;
-	}
-
-	if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
-	    (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
-	    (val == CPUFREQ_RESUMECHANGE)) {
-		if (!(freq->flags & CPUFREQ_CONST_LOOPS))
-			cpu_data[freq->cpu].loops_per_jiffy =
-				cpufreq_scale(loops_per_jiffy_ref,
-						ref_freq, freq->new);
-
-		if (cpu_khz) {
-
-			if (num_online_cpus() == 1)
-				cpu_khz = cpufreq_scale(cpu_khz_ref,
-						ref_freq, freq->new);
-			if (!(freq->flags & CPUFREQ_CONST_LOOPS)) {
-				tsc_khz = cpu_khz;
-				set_cyc2ns_scale(cpu_khz);
-				/*
-				 * TSC based sched_clock turns
-				 * to junk w/ cpufreq
-				 */
-				mark_tsc_unstable();
-			}
-		}
-	}
-end:
-	if (val != CPUFREQ_RESUMECHANGE && val != CPUFREQ_SUSPENDCHANGE)
-		write_sequnlock_irq(&xtime_lock);
-
-	return 0;
-}
-
-static struct notifier_block time_cpufreq_notifier_block = {
-	.notifier_call	= time_cpufreq_notifier
-};
-
-static int __init cpufreq_tsc(void)
-{
-	int ret;
-
-	INIT_WORK(&cpufreq_delayed_get_work, handle_cpufreq_delayed_get, NULL);
-	ret = cpufreq_register_notifier(&time_cpufreq_notifier_block,
-					CPUFREQ_TRANSITION_NOTIFIER);
-	if (!ret)
-		cpufreq_init = 1;
-
-	return ret;
-}
-
-core_initcall(cpufreq_tsc);
-
-#endif
-
-/* clock source code */
-
-static unsigned long current_tsc_khz = 0;
-static int tsc_update_callback(void);
-
-static cycle_t read_tsc(void)
-{
-	cycle_t ret;
-
-	rdtscll(ret);
-
-	return ret;
-}
-
-static struct clocksource clocksource_tsc = {
-	.name			= "tsc",
-	.rating			= 300,
-	.read			= read_tsc,
-	.mask			= CLOCKSOURCE_MASK(64),
-	.mult			= 0, /* to be set */
-	.shift			= 22,
-	.update_callback	= tsc_update_callback,
-	.is_continuous		= 1,
-};
-
-static int tsc_update_callback(void)
-{
-	int change = 0;
-
-	/* check to see if we should switch to the safe clocksource: */
-	if (clocksource_tsc.rating != 50 && check_tsc_unstable()) {
-		clocksource_tsc.rating = 50;
-		clocksource_reselect();
-		change = 1;
-	}
-
-	/* only update if tsc_khz has changed: */
-	if (current_tsc_khz != tsc_khz) {
-		current_tsc_khz = tsc_khz;
-		clocksource_tsc.mult = clocksource_khz2mult(current_tsc_khz,
-							clocksource_tsc.shift);
-		change = 1;
-	}
-
-	return change;
-}
-
-static int __init dmi_mark_tsc_unstable(struct dmi_system_id *d)
-{
-	printk(KERN_NOTICE "%s detected: marking TSC unstable.\n",
-		       d->ident);
-	mark_tsc_unstable();
-	return 0;
-}
-
-/* List of systems that have known TSC problems */
-static struct dmi_system_id __initdata bad_tsc_dmi_table[] = {
-	{
-	 .callback = dmi_mark_tsc_unstable,
-	 .ident = "IBM Thinkpad 380XD",
-	 .matches = {
-		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
-		     DMI_MATCH(DMI_BOARD_NAME, "2635FA0"),
-		     },
-	 },
-	 {}
-};
-
-#define TSC_FREQ_CHECK_INTERVAL (10*MSEC_PER_SEC) /* 10sec in MS */
-static struct timer_list verify_tsc_freq_timer;
-
-/* XXX - Probably should add locking */
-static void verify_tsc_freq(unsigned long unused)
-{
-	static u64 last_tsc;
-	static unsigned long last_jiffies;
-
-	u64 now_tsc, interval_tsc;
-	unsigned long now_jiffies, interval_jiffies;
-
-
-	if (check_tsc_unstable())
-		return;
-
-	rdtscll(now_tsc);
-	now_jiffies = jiffies;
-
-	if (!last_jiffies) {
-		goto out;
-	}
-
-	interval_jiffies = now_jiffies - last_jiffies;
-	interval_tsc = now_tsc - last_tsc;
-	interval_tsc *= HZ;
-	do_div(interval_tsc, cpu_khz*1000);
-
-	if (interval_tsc < (interval_jiffies * 3 / 4)) {
-		printk("TSC appears to be running slowly. "
-			"Marking it as unstable\n");
-		mark_tsc_unstable();
-		return;
-	}
-
-out:
-	last_tsc = now_tsc;
-	last_jiffies = now_jiffies;
-	/* set us up to go off on the next interval: */
-	mod_timer(&verify_tsc_freq_timer,
-		jiffies + msecs_to_jiffies(TSC_FREQ_CHECK_INTERVAL));
-}
-
-/*
- * Make an educated guess if the TSC is trustworthy and synchronized
- * over all CPUs.
- */
-static __init int unsynchronized_tsc(void)
-{
-	/*
-	 * Intel systems are normally all synchronized.
-	 * Exceptions must mark TSC as unstable:
-	 */
-	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
- 		return 0;
-
-	/* assume multi socket systems are not synchronized: */
- 	return num_possible_cpus() > 1;
-}
-
-static int __init init_tsc_clocksource(void)
-{
-
-	if (cpu_has_tsc && tsc_khz && !tsc_disable) {
-		/* check blacklist */
-		dmi_check_system(bad_tsc_dmi_table);
-
-		if (unsynchronized_tsc()) /* mark unstable if unsynced */
-			mark_tsc_unstable();
-		current_tsc_khz = tsc_khz;
-		clocksource_tsc.mult = clocksource_khz2mult(current_tsc_khz,
-							clocksource_tsc.shift);
-		/* lower the rating if we already know its unstable: */
-		if (check_tsc_unstable())
-			clocksource_tsc.rating = 50;
-
-		init_timer(&verify_tsc_freq_timer);
-		verify_tsc_freq_timer.function = verify_tsc_freq;
-		verify_tsc_freq_timer.expires =
-			jiffies + msecs_to_jiffies(TSC_FREQ_CHECK_INTERVAL);
-		add_timer(&verify_tsc_freq_timer);
-
-		return clocksource_register(&clocksource_tsc);
-	}
-
-	return 0;
-}
-
-module_init(init_tsc_clocksource);