As part of the i386 conversion to the generic timekeeping
infrastructure, this introduces a new tsc.c file. The code in this file
replaces the TSC initialization, management and access code currently
in timer_tsc.c (which will be removed) that we want to preserve.
The code also introduces the following functionality:
o tsc_khz: like cpu_khz but stores the TSC frequency on systems that do
not change TSC frequency w/ CPU frequency
o check/mark_tsc_unstable: accessor/modifier flag for TSC timekeeping
usability
o minor cleanups to calibration math.
thanks
-john
Signed-off-by: John Stultz <[email protected]>
arch/i386/kernel/Makefile | 2
arch/i386/kernel/setup.c | 1
arch/i386/kernel/timers/timer_tsc.c | 170 ---------------
arch/i386/kernel/tsc.c | 303 ++++++++++++++++++++++++++++
drivers/acpi/processor_idle.c | 4
include/asm-i386/mach-default/mach_timer.h | 4
include/asm-i386/mach-summit/mach_mpparse.h | 3
include/asm-i386/timex.h | 34 ---
include/asm-i386/tsc.h | 49 ++++
9 files changed, 365 insertions(+), 205 deletions(-)
linux-2.6.15-rc5_timeofday-arch-i386-part2_B15.patch
============================================
diff --git a/arch/i386/kernel/Makefile b/arch/i386/kernel/Makefile
index 7bc053f..4c4e1e5 100644
--- a/arch/i386/kernel/Makefile
+++ b/arch/i386/kernel/Makefile
@@ -7,7 +7,7 @@ extra-y := head.o init_task.o vmlinux.ld
obj-y := process.o semaphore.o signal.o entry.o traps.o irq.o vm86.o \
ptrace.o time.o ioport.o ldt.o setup.o i8259.o sys_i386.o \
pci-dma.o i386_ksyms.o i387.o dmi_scan.o bootflag.o \
- doublefault.o quirks.o i8237.o i8253.o
+ doublefault.o quirks.o i8237.o i8253.o tsc.o
obj-y += cpu/
obj-y += timers/
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index fdfcb0c..28ab317 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -1620,6 +1620,7 @@ void __init setup_arch(char **cmdline_p)
conswitchp = &dummy_con;
#endif
#endif
+ tsc_init();
}
#include "setup_arch_post.h"
diff --git a/arch/i386/kernel/timers/timer_tsc.c b/arch/i386/kernel/timers/timer_tsc.c
index d395e3b..efdbf5e 100644
--- a/arch/i386/kernel/timers/timer_tsc.c
+++ b/arch/i386/kernel/timers/timer_tsc.c
@@ -32,10 +32,6 @@ static unsigned long hpet_last;
static struct timer_opts timer_tsc;
#endif
-static inline void cpufreq_delayed_get(void);
-
-int tsc_disable __devinitdata = 0;
-
static int use_tsc;
/* Number of usecs that the last interrupt was delayed */
static int delay_at_last_interrupt;
@@ -135,30 +131,6 @@ static unsigned long long monotonic_cloc
return base + cycles_2_ns(this_offset - last_offset);
}
-/*
- * 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 (!use_tsc)
-#endif
- /* no locking but a rare wrong value is not a big deal */
- return jiffies_64 * (1000000000 / HZ);
-
- /* Read the Time Stamp Counter */
- rdtscll(this_offset);
-
- /* return the value in ns */
- return cycles_2_ns(this_offset);
-}
-
static void delay_tsc(unsigned long loops)
{
unsigned long bclock, now;
@@ -222,128 +194,6 @@ static void mark_offset_tsc_hpet(void)
#endif
-#ifdef CONFIG_CPU_FREQ
-#include <linux/workqueue.h>
-
-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 lost ticks, 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 "Losing some ticks... 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;
-
-#ifndef CONFIG_SMP
-static unsigned long fast_gettimeoffset_ref = 0;
-static unsigned int cpu_khz_ref = 0;
-#endif
-
-static int
-time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
- void *data)
-{
- struct cpufreq_freqs *freq = data;
-
- if (val != CPUFREQ_RESUMECHANGE)
- write_seqlock_irq(&xtime_lock);
- if (!ref_freq) {
- ref_freq = freq->old;
- loops_per_jiffy_ref = cpu_data[freq->cpu].loops_per_jiffy;
-#ifndef CONFIG_SMP
- fast_gettimeoffset_ref = fast_gettimeoffset_quotient;
- cpu_khz_ref = cpu_khz;
-#endif
- }
-
- 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);
-#ifndef CONFIG_SMP
- if (cpu_khz)
- cpu_khz = cpufreq_scale(cpu_khz_ref, ref_freq, freq->new);
- if (use_tsc) {
- if (!(freq->flags & CPUFREQ_CONST_LOOPS)) {
- fast_gettimeoffset_quotient = cpufreq_scale(fast_gettimeoffset_ref, freq->new, ref_freq);
- set_cyc2ns_scale(cpu_khz);
- }
- }
-#endif
- }
-
- if (val != CPUFREQ_RESUMECHANGE)
- 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);
-
-#else /* CONFIG_CPU_FREQ */
-static inline void cpufreq_delayed_get(void) { return; }
-#endif
-
-int recalibrate_cpu_khz(void)
-{
-#ifndef CONFIG_SMP
- unsigned int cpu_khz_old = cpu_khz;
-
- if (cpu_has_tsc) {
- init_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);
-
static void mark_offset_tsc(void)
{
unsigned long lost,delay;
@@ -434,9 +284,6 @@ static void mark_offset_tsc(void)
clock_fallback();
}
- /* ... but give the TSC a fair chance */
- if (lost_count > 25)
- cpufreq_delayed_get();
} else
lost_count = 0;
/* update the monotonic base value */
@@ -561,23 +408,6 @@ static int tsc_resume(void)
return 0;
}
-#ifndef CONFIG_X86_TSC
-/* 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;
-}
-#else
-static int __init tsc_setup(char *str)
-{
- printk(KERN_WARNING "notsc: Kernel compiled with CONFIG_X86_TSC, "
- "cannot disable TSC.\n");
- return 1;
-}
-#endif
-__setup("notsc", tsc_setup);
diff --git a/arch/i386/kernel/tsc.c b/arch/i386/kernel/tsc.c
new file mode 100644
index 0000000..3e9774c
--- /dev/null
+++ b/arch/i386/kernel/tsc.c
@@ -0,0 +1,303 @@
+/*
+ * 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/workqueue.h>
+#include <linux/cpufreq.h>
+#include <linux/jiffies.h>
+#include <linux/init.h>
+
+#include <asm/tsc.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 __initdata = 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 [email protected]) 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.
+ * ([email protected])
+ *
+ * [email protected] "math is hard, lets go shopping!"
+ */
+static unsigned long cyc2ns_scale;
+
+#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;
+
+ /* 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)
+ return 0;
+
+ delta64 = end - start;
+
+ /* cpu freq too fast: */
+ if (delta64 > (1ULL<<32))
+ return 0;
+
+ /* cpu freq too slow: */
+ if (delta64 <= CALIBRATE_TIME_MSEC)
+ return 0;
+
+ delta64 += CALIBRATE_TIME_MSEC/2; /* round for do_div */
+ do_div(delta64,CALIBRATE_TIME_MSEC);
+
+ return (unsigned long)delta64;
+}
+
+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);
+}
+
+#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)
+ write_seqlock_irq(&xtime_lock);
+
+ if (!ref_freq) {
+ 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();
+ }
+ }
+ }
+
+ if (val != CPUFREQ_RESUMECHANGE)
+ 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
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 5f51057..2034ed4 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -371,6 +371,10 @@ static void acpi_processor_idle(void)
ACPI_MTX_DO_NOT_LOCK);
}
+#ifdef CONFIG_GENERIC_TIME
+ /* TSC halts in C3, so notify users */
+ mark_tsc_unstable();
+#endif
/* Re-enable interrupts */
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
diff --git a/include/asm-i386/mach-default/mach_timer.h b/include/asm-i386/mach-default/mach_timer.h
index 4b9703b..807992f 100644
--- a/include/asm-i386/mach-default/mach_timer.h
+++ b/include/asm-i386/mach-default/mach_timer.h
@@ -15,7 +15,9 @@
#ifndef _MACH_TIMER_H
#define _MACH_TIMER_H
-#define CALIBRATE_LATCH (5 * LATCH)
+#define CALIBRATE_TIME_MSEC 30 /* 30 msecs */
+#define CALIBRATE_LATCH \
+ ((CLOCK_TICK_RATE * CALIBRATE_TIME_MSEC + 1000/2)/1000)
static inline void mach_prepare_counter(void)
{
diff --git a/include/asm-i386/mach-summit/mach_mpparse.h b/include/asm-i386/mach-summit/mach_mpparse.h
index 1cce2b9..9426839 100644
--- a/include/asm-i386/mach-summit/mach_mpparse.h
+++ b/include/asm-i386/mach-summit/mach_mpparse.h
@@ -2,6 +2,7 @@
#define __ASM_MACH_MPPARSE_H
#include <mach_apic.h>
+#include <asm/tsc.h>
extern int use_cyclone;
@@ -29,6 +30,7 @@ static inline int mps_oem_check(struct m
(!strncmp(productid, "VIGIL SMP", 9)
|| !strncmp(productid, "EXA", 3)
|| !strncmp(productid, "RUTHLESS SMP", 12))){
+ mark_tsc_unstable();
use_cyclone = 1; /*enable cyclone-timer*/
setup_summit();
return 1;
@@ -42,6 +44,7 @@ static inline int acpi_madt_oem_check(ch
if (!strncmp(oem_id, "IBM", 3) &&
(!strncmp(oem_table_id, "SERVIGIL", 8)
|| !strncmp(oem_table_id, "EXA", 3))){
+ mark_tsc_unstable();
use_cyclone = 1; /*enable cyclone-timer*/
setup_summit();
return 1;
diff --git a/include/asm-i386/timex.h b/include/asm-i386/timex.h
index 292b5a6..ebcc74e 100644
--- a/include/asm-i386/timex.h
+++ b/include/asm-i386/timex.h
@@ -8,6 +8,7 @@
#include <linux/config.h>
#include <asm/processor.h>
+#include <asm/tsc.h>
#ifdef CONFIG_X86_ELAN
# define CLOCK_TICK_RATE 1189200 /* AMD Elan has different frequency! */
@@ -16,39 +17,6 @@
#endif
-/*
- * Standard way to access the cycle counter on i586+ CPUs.
- * Currently only used on SMP.
- *
- * If you really have a SMP machine with i486 chips or older,
- * compile for that, and this will just always return zero.
- * That's ok, it just means that the nicer scheduling heuristics
- * won't work for you.
- *
- * We only use the low 32 bits, and we'd simply better make sure
- * that we reschedule before that wraps. Scheduling at least every
- * four billion cycles just basically sounds like a good idea,
- * regardless of how fast the machine is.
- */
-typedef unsigned long long cycles_t;
-
-static inline cycles_t get_cycles (void)
-{
- unsigned long long ret=0;
-
-#ifndef CONFIG_X86_TSC
- if (!cpu_has_tsc)
- return 0;
-#endif
-
-#if defined(CONFIG_X86_GENERIC) || defined(CONFIG_X86_TSC)
- rdtscll(ret);
-#endif
- return ret;
-}
-
-extern unsigned int cpu_khz;
-
extern int read_current_timer(unsigned long *timer_value);
#define ARCH_HAS_READ_CURRENT_TIMER 1
diff --git a/include/asm-i386/tsc.h b/include/asm-i386/tsc.h
new file mode 100644
index 0000000..97b828c
--- /dev/null
+++ b/include/asm-i386/tsc.h
@@ -0,0 +1,49 @@
+/*
+ * linux/include/asm-i386/tsc.h
+ *
+ * i386 TSC related functions
+ */
+#ifndef _ASM_i386_TSC_H
+#define _ASM_i386_TSC_H
+
+#include <linux/config.h>
+#include <asm/processor.h>
+
+/*
+ * Standard way to access the cycle counter on i586+ CPUs.
+ * Currently only used on SMP.
+ *
+ * If you really have a SMP machine with i486 chips or older,
+ * compile for that, and this will just always return zero.
+ * That's ok, it just means that the nicer scheduling heuristics
+ * won't work for you.
+ *
+ * We only use the low 32 bits, and we'd simply better make sure
+ * that we reschedule before that wraps. Scheduling at least every
+ * four billion cycles just basically sounds like a good idea,
+ * regardless of how fast the machine is.
+ */
+typedef unsigned long long cycles_t;
+
+extern unsigned int cpu_khz;
+extern unsigned int tsc_khz;
+
+static inline cycles_t get_cycles(void)
+{
+ unsigned long long ret = 0;
+
+#ifndef CONFIG_X86_TSC
+ if (!cpu_has_tsc)
+ return 0;
+#endif
+
+#if defined(CONFIG_X86_GENERIC) || defined(CONFIG_X86_TSC)
+ rdtscll(ret);
+#endif
+ return ret;
+}
+
+extern void tsc_init(void);
+extern void mark_tsc_unstable(void);
+
+#endif
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