svn commit: r216283 - in head/sys: amd64/amd64 amd64/include conf
i386/i386 x86/x86
Jung-uk Kim
jkim at FreeBSD.org
Wed Dec 8 00:09:24 UTC 2010
Author: jkim
Date: Wed Dec 8 00:09:24 2010
New Revision: 216283
URL: http://svn.freebsd.org/changeset/base/216283
Log:
Merge sys/amd64/amd64/tsc.c and sys/i386/i386/tsc.c and move to sys/x86/x86.
Discussed with: avg
Added:
head/sys/x86/x86/tsc.c
- copied unchanged from r216279, head/sys/i386/i386/tsc.c
Deleted:
head/sys/amd64/amd64/tsc.c
head/sys/i386/i386/tsc.c
Modified:
head/sys/amd64/include/cpu.h
head/sys/conf/files.amd64
head/sys/conf/files.i386
head/sys/conf/files.pc98
Modified: head/sys/amd64/include/cpu.h
==============================================================================
--- head/sys/amd64/include/cpu.h Tue Dec 7 23:56:51 2010 (r216282)
+++ head/sys/amd64/include/cpu.h Wed Dec 8 00:09:24 2010 (r216283)
@@ -56,6 +56,7 @@
#ifdef _KERNEL
extern char btext[];
extern char etext[];
+extern int tsc_present;
void cpu_halt(void);
void cpu_reset(void);
Modified: head/sys/conf/files.amd64
==============================================================================
--- head/sys/conf/files.amd64 Tue Dec 7 23:56:51 2010 (r216282)
+++ head/sys/conf/files.amd64 Wed Dec 8 00:09:24 2010 (r216283)
@@ -126,7 +126,6 @@ amd64/amd64/stack_machdep.c optional ddb
amd64/amd64/support.S standard
amd64/amd64/sys_machdep.c standard
amd64/amd64/trap.c standard
-amd64/amd64/tsc.c standard
amd64/amd64/uio_machdep.c standard
amd64/amd64/uma_machdep.c standard
amd64/amd64/vm_machdep.c standard
@@ -326,3 +325,4 @@ x86/x86/mptable.c optional mptable
x86/x86/mptable_pci.c optional mptable pci
x86/x86/msi.c optional pci
x86/x86/nexus.c standard
+x86/x86/tsc.c standard
Modified: head/sys/conf/files.i386
==============================================================================
--- head/sys/conf/files.i386 Tue Dec 7 23:56:51 2010 (r216282)
+++ head/sys/conf/files.i386 Wed Dec 8 00:09:24 2010 (r216283)
@@ -312,7 +312,6 @@ i386/i386/support.s standard
i386/i386/swtch.s standard
i386/i386/sys_machdep.c standard
i386/i386/trap.c standard
-i386/i386/tsc.c standard
i386/i386/uio_machdep.c standard
i386/i386/vm86.c standard
i386/i386/vm_machdep.c standard
@@ -415,3 +414,4 @@ x86/x86/mptable.c optional apic native
x86/x86/mptable_pci.c optional apic pci
x86/x86/msi.c optional apic pci
x86/x86/nexus.c standard
+x86/x86/tsc.c standard
Modified: head/sys/conf/files.pc98
==============================================================================
--- head/sys/conf/files.pc98 Tue Dec 7 23:56:51 2010 (r216282)
+++ head/sys/conf/files.pc98 Wed Dec 8 00:09:24 2010 (r216283)
@@ -164,7 +164,6 @@ i386/i386/support.s standard
i386/i386/swtch.s standard
i386/i386/sys_machdep.c standard
i386/i386/trap.c standard
-i386/i386/tsc.c standard
i386/i386/uio_machdep.c standard
i386/i386/vm86.c standard
i386/i386/vm_machdep.c standard
@@ -259,3 +258,4 @@ x86/x86/mptable.c optional apic
x86/x86/mptable_pci.c optional apic pci
x86/x86/msi.c optional apic pci
x86/x86/nexus.c standard
+x86/x86/tsc.c standard
Copied: head/sys/x86/x86/tsc.c (from r216279, head/sys/i386/i386/tsc.c)
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/x86/x86/tsc.c Wed Dec 8 00:09:24 2010 (r216283, copy of r216279, head/sys/i386/i386/tsc.c)
@@ -0,0 +1,281 @@
+/*-
+ * Copyright (c) 1998-2003 Poul-Henning Kamp
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_clock.h"
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/cpu.h>
+#include <sys/malloc.h>
+#include <sys/systm.h>
+#include <sys/sysctl.h>
+#include <sys/time.h>
+#include <sys/timetc.h>
+#include <sys/kernel.h>
+#include <sys/power.h>
+#include <sys/smp.h>
+#include <machine/clock.h>
+#include <machine/cputypes.h>
+#include <machine/md_var.h>
+#include <machine/specialreg.h>
+
+#include "cpufreq_if.h"
+
+uint64_t tsc_freq;
+int tsc_is_broken;
+int tsc_is_invariant;
+int tsc_present;
+static eventhandler_tag tsc_levels_tag, tsc_pre_tag, tsc_post_tag;
+
+SYSCTL_INT(_kern_timecounter, OID_AUTO, invariant_tsc, CTLFLAG_RDTUN,
+ &tsc_is_invariant, 0, "Indicates whether the TSC is P-state invariant");
+TUNABLE_INT("kern.timecounter.invariant_tsc", &tsc_is_invariant);
+
+#ifdef SMP
+static int smp_tsc;
+SYSCTL_INT(_kern_timecounter, OID_AUTO, smp_tsc, CTLFLAG_RDTUN, &smp_tsc, 0,
+ "Indicates whether the TSC is safe to use in SMP mode");
+TUNABLE_INT("kern.timecounter.smp_tsc", &smp_tsc);
+#endif
+
+static void tsc_freq_changed(void *arg, const struct cf_level *level,
+ int status);
+static void tsc_freq_changing(void *arg, const struct cf_level *level,
+ int *status);
+static unsigned tsc_get_timecount(struct timecounter *tc);
+static void tsc_levels_changed(void *arg, int unit);
+
+static struct timecounter tsc_timecounter = {
+ tsc_get_timecount, /* get_timecount */
+ 0, /* no poll_pps */
+ ~0u, /* counter_mask */
+ 0, /* frequency */
+ "TSC", /* name */
+ 800, /* quality (adjusted in code) */
+};
+
+void
+init_TSC(void)
+{
+ u_int64_t tscval[2];
+
+ if (cpu_feature & CPUID_TSC)
+ tsc_present = 1;
+ else
+ tsc_present = 0;
+
+ if (!tsc_present)
+ return;
+
+ if (bootverbose)
+ printf("Calibrating TSC clock ... ");
+
+ tscval[0] = rdtsc();
+ DELAY(1000000);
+ tscval[1] = rdtsc();
+
+ tsc_freq = tscval[1] - tscval[0];
+ if (bootverbose)
+ printf("TSC clock: %ju Hz\n", (intmax_t)tsc_freq);
+
+ switch (cpu_vendor_id) {
+ case CPU_VENDOR_AMD:
+ if ((amd_pminfo & AMDPM_TSC_INVARIANT) ||
+ CPUID_TO_FAMILY(cpu_id) >= 0x10 || cpu_id == 0x60fb2)
+ tsc_is_invariant = 1;
+ break;
+ case CPU_VENDOR_INTEL:
+ if ((amd_pminfo & AMDPM_TSC_INVARIANT) ||
+ (CPUID_TO_FAMILY(cpu_id) == 0x6 &&
+ CPUID_TO_MODEL(cpu_id) >= 0xe) ||
+ (CPUID_TO_FAMILY(cpu_id) == 0xf &&
+ CPUID_TO_MODEL(cpu_id) >= 0x3))
+ tsc_is_invariant = 1;
+ break;
+ case CPU_VENDOR_CENTAUR:
+ if (CPUID_TO_FAMILY(cpu_id) == 0x6 &&
+ CPUID_TO_MODEL(cpu_id) >= 0xf &&
+ (rdmsr(0x1203) & 0x100000000ULL) == 0)
+ tsc_is_invariant = 1;
+ break;
+ }
+
+ /*
+ * Inform CPU accounting about our boot-time clock rate. This will
+ * be updated if someone loads a cpufreq driver after boot that
+ * discovers a new max frequency.
+ */
+ set_cputicker(rdtsc, tsc_freq, 1);
+
+ if (tsc_is_invariant)
+ return;
+
+ /* Register to find out about changes in CPU frequency. */
+ tsc_pre_tag = EVENTHANDLER_REGISTER(cpufreq_pre_change,
+ tsc_freq_changing, NULL, EVENTHANDLER_PRI_FIRST);
+ tsc_post_tag = EVENTHANDLER_REGISTER(cpufreq_post_change,
+ tsc_freq_changed, NULL, EVENTHANDLER_PRI_FIRST);
+ tsc_levels_tag = EVENTHANDLER_REGISTER(cpufreq_levels_changed,
+ tsc_levels_changed, NULL, EVENTHANDLER_PRI_ANY);
+}
+
+void
+init_TSC_tc(void)
+{
+
+ if (!tsc_present)
+ return;
+
+ /*
+ * We can not use the TSC if we support APM. Precise timekeeping
+ * on an APM'ed machine is at best a fools pursuit, since
+ * any and all of the time spent in various SMM code can't
+ * be reliably accounted for. Reading the RTC is your only
+ * source of reliable time info. The i8254 loses too, of course,
+ * but we need to have some kind of time...
+ * We don't know at this point whether APM is going to be used
+ * or not, nor when it might be activated. Play it safe.
+ */
+ if (power_pm_get_type() == POWER_PM_TYPE_APM) {
+ tsc_timecounter.tc_quality = -1000;
+ if (bootverbose)
+ printf("TSC timecounter disabled: APM enabled.\n");
+ }
+
+#ifdef SMP
+ /*
+ * We can not use the TSC in SMP mode unless the TSCs on all CPUs
+ * are somehow synchronized. Some hardware configurations do
+ * this, but we have no way of determining whether this is the
+ * case, so we do not use the TSC in multi-processor systems
+ * unless the user indicated (by setting kern.timecounter.smp_tsc
+ * to 1) that he believes that his TSCs are synchronized.
+ */
+ if (mp_ncpus > 1 && !smp_tsc)
+ tsc_timecounter.tc_quality = -100;
+#endif
+
+ if (tsc_freq != 0 && !tsc_is_broken) {
+ tsc_timecounter.tc_frequency = tsc_freq;
+ tc_init(&tsc_timecounter);
+ }
+}
+
+/*
+ * When cpufreq levels change, find out about the (new) max frequency. We
+ * use this to update CPU accounting in case it got a lower estimate at boot.
+ */
+static void
+tsc_levels_changed(void *arg, int unit)
+{
+ device_t cf_dev;
+ struct cf_level *levels;
+ int count, error;
+ uint64_t max_freq;
+
+ /* Only use values from the first CPU, assuming all are equal. */
+ if (unit != 0)
+ return;
+
+ /* Find the appropriate cpufreq device instance. */
+ cf_dev = devclass_get_device(devclass_find("cpufreq"), unit);
+ if (cf_dev == NULL) {
+ printf("tsc_levels_changed() called but no cpufreq device?\n");
+ return;
+ }
+
+ /* Get settings from the device and find the max frequency. */
+ count = 64;
+ levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT);
+ if (levels == NULL)
+ return;
+ error = CPUFREQ_LEVELS(cf_dev, levels, &count);
+ if (error == 0 && count != 0) {
+ max_freq = (uint64_t)levels[0].total_set.freq * 1000000;
+ set_cputicker(rdtsc, max_freq, 1);
+ } else
+ printf("tsc_levels_changed: no max freq found\n");
+ free(levels, M_TEMP);
+}
+
+/*
+ * If the TSC timecounter is in use, veto the pending change. It may be
+ * possible in the future to handle a dynamically-changing timecounter rate.
+ */
+static void
+tsc_freq_changing(void *arg, const struct cf_level *level, int *status)
+{
+
+ if (*status != 0 || timecounter != &tsc_timecounter)
+ return;
+
+ printf("timecounter TSC must not be in use when "
+ "changing frequencies; change denied\n");
+ *status = EBUSY;
+}
+
+/* Update TSC freq with the value indicated by the caller. */
+static void
+tsc_freq_changed(void *arg, const struct cf_level *level, int status)
+{
+
+ /* If there was an error during the transition, don't do anything. */
+ if (status != 0)
+ return;
+
+ /* Total setting for this level gives the new frequency in MHz. */
+ tsc_freq = (uint64_t)level->total_set.freq * 1000000;
+ tsc_timecounter.tc_frequency = tsc_freq;
+}
+
+static int
+sysctl_machdep_tsc_freq(SYSCTL_HANDLER_ARGS)
+{
+ int error;
+ uint64_t freq;
+
+ if (tsc_timecounter.tc_frequency == 0)
+ return (EOPNOTSUPP);
+ freq = tsc_freq;
+ error = sysctl_handle_quad(oidp, &freq, 0, req);
+ if (error == 0 && req->newptr != NULL) {
+ tsc_freq = freq;
+ tsc_timecounter.tc_frequency = tsc_freq;
+ }
+ return (error);
+}
+
+SYSCTL_PROC(_machdep, OID_AUTO, tsc_freq, CTLTYPE_QUAD | CTLFLAG_RW,
+ 0, 0, sysctl_machdep_tsc_freq, "QU", "");
+
+static unsigned
+tsc_get_timecount(struct timecounter *tc)
+{
+ return (rdtsc());
+}
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