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authorLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 08:15:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 08:15:40 -0700
commitab86e974f04b1cd827a9c7c35273834ebcd9ab38 (patch)
tree41df33732d2700d6d57d1e7ab3f430942f09ffcc /arch/x86
parent8700c95adb033843fc163d112b9d21d4fda78018 (diff)
parent6f7a05d7018de222e40ca003721037a530979974 (diff)
downloadlinux-ab86e974f04b1cd827a9c7c35273834ebcd9ab38.tar.gz
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull core timer updates from Ingo Molnar: "The main changes in this cycle's merge are: - Implement shadow timekeeper to shorten in kernel reader side blocking, by Thomas Gleixner. - Posix timers enhancements by Pavel Emelyanov: - allocate timer ID per process, so that exact timer ID allocations can be re-created be checkpoint/restore code. - debuggability and tooling (/proc/PID/timers, etc.) improvements. - suspend/resume enhancements by Feng Tang: on certain new Intel Atom processors (Penwell and Cloverview), there is a feature that the TSC won't stop in S3 state, so the TSC value won't be reset to 0 after resume. This can be taken advantage of by the generic via the CLOCK_SOURCE_SUSPEND_NONSTOP flag: instead of using the RTC to recover/approximate sleep time, the main (and precise) clocksource can be used. - Fix /proc/timer_list for 4096 CPUs by Nathan Zimmer: on so many CPUs the file goes beyond 4MB of size and thus the current simplistic seqfile approach fails. Convert /proc/timer_list to a proper seq_file with its own iterator. - Cleanups and refactorings of the core timekeeping code by John Stultz. - International Atomic Clock time is managed by the NTP code internally currently but not exposed externally. Separate the TAI code out and add CLOCK_TAI support and TAI support to the hrtimer and posix-timer code, by John Stultz. - Add deep idle support enhacement to the broadcast clockevents core timer code, by Daniel Lezcano: add an opt-in CLOCK_EVT_FEAT_DYNIRQ clockevents feature (which will be utilized by future clockevents driver updates), which allows the use of IRQ affinities to avoid spurious wakeups of idle CPUs - the right CPU with an expiring timer will be woken. - Add new ARM bcm281xx clocksource driver, by Christian Daudt - ... various other fixes and cleanups" * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (52 commits) clockevents: Set dummy handler on CPU_DEAD shutdown timekeeping: Update tk->cycle_last in resume posix-timers: Remove unused variable clockevents: Switch into oneshot mode even if broadcast registered late timer_list: Convert timer list to be a proper seq_file timer_list: Split timer_list_show_tickdevices posix-timers: Show sigevent info in proc file posix-timers: Introduce /proc/PID/timers file posix timers: Allocate timer id per process (v2) timekeeping: Make sure to notify hrtimers when TAI offset changes hrtimer: Fix ktime_add_ns() overflow on 32bit architectures hrtimer: Add expiry time overflow check in hrtimer_interrupt timekeeping: Shorten seq_count region timekeeping: Implement a shadow timekeeper timekeeping: Delay update of clock->cycle_last timekeeping: Store cycle_last value in timekeeper struct as well ntp: Remove ntp_lock, using the timekeeping locks to protect ntp state timekeeping: Simplify tai updating from do_adjtimex timekeeping: Hold timekeepering locks in do_adjtimex and hardpps timekeeping: Move ADJ_SETOFFSET to top level do_adjtimex() ...
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/Kconfig1
-rw-r--r--arch/x86/include/asm/cpufeature.h1
-rw-r--r--arch/x86/kernel/cpu/intel.c12
-rw-r--r--arch/x86/kernel/rtc.c69
-rw-r--r--arch/x86/kernel/tsc.c6
-rw-r--r--arch/x86/platform/efi/efi.c24
-rw-r--r--arch/x86/platform/mrst/vrtc.c44
7 files changed, 73 insertions, 84 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d75b48c11be..e93ccb9b1cc 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -120,6 +120,7 @@ config X86
select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION
select OLD_SIGACTION if X86_32
select COMPAT_OLD_SIGACTION if IA32_EMULATION
+ select RTC_LIB
config INSTRUCTION_DECODER
def_bool y
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index ac10df72925..6ce47980025 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -100,6 +100,7 @@
#define X86_FEATURE_AMD_DCM (3*32+27) /* multi-node processor */
#define X86_FEATURE_APERFMPERF (3*32+28) /* APERFMPERF */
#define X86_FEATURE_EAGER_FPU (3*32+29) /* "eagerfpu" Non lazy FPU restore */
+#define X86_FEATURE_NONSTOP_TSC_S3 (3*32+30) /* TSC doesn't stop in S3 state */
/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
#define X86_FEATURE_XMM3 (4*32+ 0) /* "pni" SSE-3 */
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 1905ce98bee..e7ae0d89e7e 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -96,6 +96,18 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
sched_clock_stable = 1;
}
+ /* Penwell and Cloverview have the TSC which doesn't sleep on S3 */
+ if (c->x86 == 6) {
+ switch (c->x86_model) {
+ case 0x27: /* Penwell */
+ case 0x35: /* Cloverview */
+ set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC_S3);
+ break;
+ default:
+ break;
+ }
+ }
+
/*
* There is a known erratum on Pentium III and Core Solo
* and Core Duo CPUs.
diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c
index 2e8f3d3b564..198eb201ed3 100644
--- a/arch/x86/kernel/rtc.c
+++ b/arch/x86/kernel/rtc.c
@@ -13,6 +13,7 @@
#include <asm/x86_init.h>
#include <asm/time.h>
#include <asm/mrst.h>
+#include <asm/rtc.h>
#ifdef CONFIG_X86_32
/*
@@ -36,70 +37,24 @@ EXPORT_SYMBOL(rtc_lock);
* nowtime is written into the registers of the CMOS clock, it will
* jump to the next second precisely 500 ms later. Check the Motorola
* MC146818A or Dallas DS12887 data sheet for details.
- *
- * BUG: This routine does not handle hour overflow properly; it just
- * sets the minutes. Usually you'll only notice that after reboot!
*/
int mach_set_rtc_mmss(unsigned long nowtime)
{
- int real_seconds, real_minutes, cmos_minutes;
- unsigned char save_control, save_freq_select;
- unsigned long flags;
+ struct rtc_time tm;
int retval = 0;
- spin_lock_irqsave(&rtc_lock, flags);
-
- /* tell the clock it's being set */
- save_control = CMOS_READ(RTC_CONTROL);
- CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
-
- /* stop and reset prescaler */
- save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
- CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
-
- cmos_minutes = CMOS_READ(RTC_MINUTES);
- if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
- cmos_minutes = bcd2bin(cmos_minutes);
-
- /*
- * since we're only adjusting minutes and seconds,
- * don't interfere with hour overflow. This avoids
- * messing with unknown time zones but requires your
- * RTC not to be off by more than 15 minutes
- */
- real_seconds = nowtime % 60;
- real_minutes = nowtime / 60;
- /* correct for half hour time zone */
- if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
- real_minutes += 30;
- real_minutes %= 60;
-
- if (abs(real_minutes - cmos_minutes) < 30) {
- if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
- real_seconds = bin2bcd(real_seconds);
- real_minutes = bin2bcd(real_minutes);
- }
- CMOS_WRITE(real_seconds, RTC_SECONDS);
- CMOS_WRITE(real_minutes, RTC_MINUTES);
+ rtc_time_to_tm(nowtime, &tm);
+ if (!rtc_valid_tm(&tm)) {
+ retval = set_rtc_time(&tm);
+ if (retval)
+ printk(KERN_ERR "%s: RTC write failed with error %d\n",
+ __FUNCTION__, retval);
} else {
- printk_once(KERN_NOTICE
- "set_rtc_mmss: can't update from %d to %d\n",
- cmos_minutes, real_minutes);
- retval = -1;
+ printk(KERN_ERR
+ "%s: Invalid RTC value: write of %lx to RTC failed\n",
+ __FUNCTION__, nowtime);
+ retval = -EINVAL;
}
-
- /* The following flags have to be released exactly in this order,
- * otherwise the DS12887 (popular MC146818A clone with integrated
- * battery and quartz) will not reset the oscillator and will not
- * update precisely 500 ms later. You won't find this mentioned in
- * the Dallas Semiconductor data sheets, but who believes data
- * sheets anyway ... -- Markus Kuhn
- */
- CMOS_WRITE(save_control, RTC_CONTROL);
- CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
-
- spin_unlock_irqrestore(&rtc_lock, flags);
-
return retval;
}
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 4b9ea101fe3..098b3cfda72 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -768,7 +768,8 @@ static cycle_t read_tsc(struct clocksource *cs)
static void resume_tsc(struct clocksource *cs)
{
- clocksource_tsc.cycle_last = 0;
+ if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC_S3))
+ clocksource_tsc.cycle_last = 0;
}
static struct clocksource clocksource_tsc = {
@@ -939,6 +940,9 @@ static int __init init_tsc_clocksource(void)
clocksource_tsc.flags &= ~CLOCK_SOURCE_IS_CONTINUOUS;
}
+ if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC_S3))
+ clocksource_tsc.flags |= CLOCK_SOURCE_SUSPEND_NONSTOP;
+
/*
* Trust the results of the earlier calibration on systems
* exporting a reliable TSC.
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index e4a86a677ce..b55d174e503 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -49,6 +49,7 @@
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/x86_init.h>
+#include <asm/rtc.h>
#define EFI_DEBUG 1
@@ -352,10 +353,10 @@ static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
int efi_set_rtc_mmss(unsigned long nowtime)
{
- int real_seconds, real_minutes;
efi_status_t status;
efi_time_t eft;
efi_time_cap_t cap;
+ struct rtc_time tm;
status = efi.get_time(&eft, &cap);
if (status != EFI_SUCCESS) {
@@ -363,13 +364,20 @@ int efi_set_rtc_mmss(unsigned long nowtime)
return -1;
}
- real_seconds = nowtime % 60;
- real_minutes = nowtime / 60;
- if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
- real_minutes += 30;
- real_minutes %= 60;
- eft.minute = real_minutes;
- eft.second = real_seconds;
+ rtc_time_to_tm(nowtime, &tm);
+ if (!rtc_valid_tm(&tm)) {
+ eft.year = tm.tm_year + 1900;
+ eft.month = tm.tm_mon + 1;
+ eft.day = tm.tm_mday;
+ eft.minute = tm.tm_min;
+ eft.second = tm.tm_sec;
+ eft.nanosecond = 0;
+ } else {
+ printk(KERN_ERR
+ "%s: Invalid EFI RTC value: write of %lx to EFI RTC failed\n",
+ __FUNCTION__, nowtime);
+ return -1;
+ }
status = efi.set_time(&eft);
if (status != EFI_SUCCESS) {
diff --git a/arch/x86/platform/mrst/vrtc.c b/arch/x86/platform/mrst/vrtc.c
index 225bd0f0f67..d62b0a3b5c1 100644
--- a/arch/x86/platform/mrst/vrtc.c
+++ b/arch/x86/platform/mrst/vrtc.c
@@ -85,27 +85,35 @@ unsigned long vrtc_get_time(void)
return mktime(year, mon, mday, hour, min, sec);
}
-/* Only care about the minutes and seconds */
int vrtc_set_mmss(unsigned long nowtime)
{
- int real_sec, real_min;
unsigned long flags;
- int vrtc_min;
-
- spin_lock_irqsave(&rtc_lock, flags);
- vrtc_min = vrtc_cmos_read(RTC_MINUTES);
-
- real_sec = nowtime % 60;
- real_min = nowtime / 60;
- if (((abs(real_min - vrtc_min) + 15)/30) & 1)
- real_min += 30;
- real_min %= 60;
-
- vrtc_cmos_write(real_sec, RTC_SECONDS);
- vrtc_cmos_write(real_min, RTC_MINUTES);
- spin_unlock_irqrestore(&rtc_lock, flags);
-
- return 0;
+ struct rtc_time tm;
+ int year;
+ int retval = 0;
+
+ rtc_time_to_tm(nowtime, &tm);
+ if (!rtc_valid_tm(&tm) && tm.tm_year >= 72) {
+ /*
+ * tm.year is the number of years since 1900, and the
+ * vrtc need the years since 1972.
+ */
+ year = tm.tm_year - 72;
+ spin_lock_irqsave(&rtc_lock, flags);
+ vrtc_cmos_write(year, RTC_YEAR);
+ vrtc_cmos_write(tm.tm_mon, RTC_MONTH);
+ vrtc_cmos_write(tm.tm_mday, RTC_DAY_OF_MONTH);
+ vrtc_cmos_write(tm.tm_hour, RTC_HOURS);
+ vrtc_cmos_write(tm.tm_min, RTC_MINUTES);
+ vrtc_cmos_write(tm.tm_sec, RTC_SECONDS);
+ spin_unlock_irqrestore(&rtc_lock, flags);
+ } else {
+ printk(KERN_ERR
+ "%s: Invalid vRTC value: write of %lx to vRTC failed\n",
+ __FUNCTION__, nowtime);
+ retval = -EINVAL;
+ }
+ return retval;
}
void __init mrst_rtc_init(void)