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x86/asm/tsc: Rename native_read_tsc() to rdtsc() 

Now that there is no paravirt TSC, the "native" is
inappropriate. The function does RDTSC, so give it the obvious
name: rdtsc().

Suggested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Len Brown <lenb@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kvm ML <kvm@vger.kernel.org>
Link: http://lkml.kernel.org/r/fd43e16281991f096c1e4d21574d9e1402c62d39.1434501121.git.luto@kernel.org
[ Ported it to v4.2-rc1. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Lutomirski 2015-06-25 18:44:07 +02:00 committed by Ingo Molnar
parent fe47ae6e1a
commit 4ea1636b04
25 changed files with 59 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/boot/compressed/aslr.c
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@ -82,7 +82,7 @@ static unsigned long get_random_long(void)
if (has_cpuflag(X86_FEATURE_TSC)) {
debug_putstr(" RDTSC");
raw = native_read_tsc();
raw = rdtsc();
random ^= raw;
use_i8254 = false;

2
arch/x86/entry/vdso/vclock_gettime.c
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@ -186,7 +186,7 @@ notrace static cycle_t vread_tsc(void)
* but no one has ever seen it happen.
*/
rdtsc_barrier();
ret = (cycle_t)native_read_tsc();
ret = (cycle_t)rdtsc();
last = gtod->cycle_last;

11
arch/x86/include/asm/msr.h
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@ -109,7 +109,16 @@ notrace static inline int native_write_msr_safe(unsigned int msr,
extern int rdmsr_safe_regs(u32 regs[8]);
extern int wrmsr_safe_regs(u32 regs[8]);
static __always_inline unsigned long long native_read_tsc(void)
/**
* rdtsc() - returns the current TSC without ordering constraints
*
* rdtsc() returns the result of RDTSC as a 64-bit integer. The
* only ordering constraint it supplies is the ordering implied by
* "asm volatile": it will put the RDTSC in the place you expect. The
* CPU can and will speculatively execute that RDTSC, though, so the
* results can be non-monotonic if compared on different CPUs.
*/
static __always_inline unsigned long long rdtsc(void)
{
DECLARE_ARGS(val, low, high);

2
arch/x86/include/asm/pvclock.h
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@ -62,7 +62,7 @@ static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift)
static __always_inline
u64 pvclock_get_nsec_offset(const struct pvclock_vcpu_time_info *src)
{
u64 delta = native_read_tsc() - src->tsc_timestamp;
u64 delta = rdtsc() - src->tsc_timestamp;
return pvclock_scale_delta(delta, src->tsc_to_system_mul,
src->tsc_shift);
}

2
arch/x86/include/asm/stackprotector.h
View File

@ -72,7 +72,7 @@ static __always_inline void boot_init_stack_canary(void)
* on during the bootup the random pool has true entropy too.
*/
get_random_bytes(&canary, sizeof(canary));
tsc = native_read_tsc();
tsc = rdtsc();
canary += tsc + (tsc << 32UL);
current->stack_canary = canary;

2
arch/x86/include/asm/tsc.h
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@ -26,7 +26,7 @@ static inline cycles_t get_cycles(void)
return 0;
#endif
return native_read_tsc();
return rdtsc();
}
extern void tsc_init(void);

8
arch/x86/kernel/apb_timer.c
View File

@ -263,7 +263,7 @@ static int apbt_clocksource_register(void)
/* Verify whether apbt counter works */
t1 = dw_apb_clocksource_read(clocksource_apbt);
start = native_read_tsc();
start = rdtsc();
/*
* We don't know the TSC frequency yet, but waiting for
@ -273,7 +273,7 @@ static int apbt_clocksource_register(void)
*/
do {
rep_nop();
now = native_read_tsc();
now = rdtsc();
} while ((now - start) < 200000UL);
/* APBT is the only always on clocksource, it has to work! */
@ -390,13 +390,13 @@ unsigned long apbt_quick_calibrate(void)
old = dw_apb_clocksource_read(clocksource_apbt);
old += loop;
t1 = native_read_tsc();
t1 = rdtsc();
do {
new = dw_apb_clocksource_read(clocksource_apbt);
} while (new < old);
t2 = native_read_tsc();
t2 = rdtsc();
shift = 5;
if (unlikely(loop >> shift == 0)) {

8
arch/x86/kernel/apic/apic.c
View File

@ -457,7 +457,7 @@ static int lapic_next_deadline(unsigned long delta,
{
u64 tsc;
tsc = native_read_tsc();
tsc = rdtsc();
wrmsrl(MSR_IA32_TSC_DEADLINE, tsc + (((u64) delta) * TSC_DIVISOR));
return 0;
}
@ -592,7 +592,7 @@ static void __init lapic_cal_handler(struct clock_event_device *dev)
unsigned long pm = acpi_pm_read_early();
if (cpu_has_tsc)
tsc = native_read_tsc();
tsc = rdtsc();
switch (lapic_cal_loops++) {
case 0:
@ -1209,7 +1209,7 @@ void setup_local_APIC(void)
long long max_loops = cpu_khz ? cpu_khz : 1000000;
if (cpu_has_tsc)
tsc = native_read_tsc();
tsc = rdtsc();
if (disable_apic) {
disable_ioapic_support();
@ -1293,7 +1293,7 @@ void setup_local_APIC(void)
}
if (queued) {
if (cpu_has_tsc && cpu_khz) {
ntsc = native_read_tsc();
ntsc = rdtsc();
max_loops = (cpu_khz << 10) - (ntsc - tsc);
} else
max_loops--;

4
arch/x86/kernel/cpu/amd.c
View File

@ -125,10 +125,10 @@ static void init_amd_k6(struct cpuinfo_x86 *c)
n = K6_BUG_LOOP;
f_vide = vide;
d = native_read_tsc();
d = rdtsc();
while (n--)
f_vide();
d2 = native_read_tsc();
d2 = rdtsc();
d = d2-d;
if (d > 20*K6_BUG_LOOP)

4
arch/x86/kernel/cpu/mcheck/mce.c
View File

@ -125,7 +125,7 @@ void mce_setup(struct mce *m)
{
memset(m, 0, sizeof(struct mce));
m->cpu = m->extcpu = smp_processor_id();
m->tsc = native_read_tsc();
m->tsc = rdtsc();
/* We hope get_seconds stays lockless */
m->time = get_seconds();
m->cpuvendor = boot_cpu_data.x86_vendor;
@ -1784,7 +1784,7 @@ static void collect_tscs(void *data)
{
unsigned long *cpu_tsc = (unsigned long *)data;
cpu_tsc[smp_processor_id()] = native_read_tsc();
cpu_tsc[smp_processor_id()] = rdtsc();
}
static int mce_apei_read_done;

2
arch/x86/kernel/espfix_64.c
View File

@ -110,7 +110,7 @@ static void init_espfix_random(void)
*/
if (!arch_get_random_long(&rand)) {
/* The constant is an arbitrary large prime */
rand = native_read_tsc();
rand = rdtsc();
rand *= 0xc345c6b72fd16123UL;
}

4
arch/x86/kernel/hpet.c
View File

@ -735,7 +735,7 @@ static int hpet_clocksource_register(void)
/* Verify whether hpet counter works */
t1 = hpet_readl(HPET_COUNTER);
start = native_read_tsc();
start = rdtsc();
/*
* We don't know the TSC frequency yet, but waiting for
@ -745,7 +745,7 @@ static int hpet_clocksource_register(void)
*/
do {
rep_nop();
now = native_read_tsc();
now = rdtsc();
} while ((now - start) < 200000UL);
if (t1 == hpet_readl(HPET_COUNTER)) {

2
arch/x86/kernel/trace_clock.c
View File

@ -15,7 +15,7 @@ u64 notrace trace_clock_x86_tsc(void)
u64 ret;
rdtsc_barrier();
ret = native_read_tsc();
ret = rdtsc();
return ret;
}

4
arch/x86/kernel/tsc.c
View File

@ -248,7 +248,7 @@ static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
data = cyc2ns_write_begin(cpu);
tsc_now = native_read_tsc();
tsc_now = rdtsc();
ns_now = cycles_2_ns(tsc_now);
/*
@ -290,7 +290,7 @@ u64 native_sched_clock(void)
}
/* read the Time Stamp Counter: */
tsc_now = native_read_tsc();
tsc_now = rdtsc();
/* return the value in ns */
return cycles_2_ns(tsc_now);

4
arch/x86/kvm/lapic.c
View File

@ -1172,7 +1172,7 @@ void wait_lapic_expire(struct kvm_vcpu *vcpu)
tsc_deadline = apic->lapic_timer.expired_tscdeadline;
apic->lapic_timer.expired_tscdeadline = 0;
guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, native_read_tsc());
guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, rdtsc());
trace_kvm_wait_lapic_expire(vcpu->vcpu_id, guest_tsc - tsc_deadline);
/* __delay is delay_tsc whenever the hardware has TSC, thus always. */
@ -1240,7 +1240,7 @@ static void start_apic_timer(struct kvm_lapic *apic)
local_irq_save(flags);
now = apic->lapic_timer.timer.base->get_time();
guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, native_read_tsc());
guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, rdtsc());
if (likely(tscdeadline > guest_tsc)) {
ns = (tscdeadline - guest_tsc) * 1000000ULL;
do_div(ns, this_tsc_khz);

4
arch/x86/kvm/svm.c
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@ -1080,7 +1080,7 @@ static u64 svm_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)
{
u64 tsc;
tsc = svm_scale_tsc(vcpu, native_read_tsc());
tsc = svm_scale_tsc(vcpu, rdtsc());
return target_tsc - tsc;
}
@ -3079,7 +3079,7 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
switch (msr_info->index) {
case MSR_IA32_TSC: {
msr_info->data = svm->vmcb->control.tsc_offset +
svm_scale_tsc(vcpu, native_read_tsc());
svm_scale_tsc(vcpu, rdtsc());
break;
}

4
arch/x86/kvm/vmx.c
View File

@ -2236,7 +2236,7 @@ static u64 guest_read_tsc(void)
{
u64 host_tsc, tsc_offset;
host_tsc = native_read_tsc();
host_tsc = rdtsc();
tsc_offset = vmcs_read64(TSC_OFFSET);
return host_tsc + tsc_offset;
}
@ -2317,7 +2317,7 @@ static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment, bool ho
static u64 vmx_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)
{
return target_tsc - native_read_tsc();
return target_tsc - rdtsc();
}
static bool guest_cpuid_has_vmx(struct kvm_vcpu *vcpu)

12
arch/x86/kvm/x86.c
View File

@ -1455,7 +1455,7 @@ static cycle_t read_tsc(void)
* but no one has ever seen it happen.
*/
rdtsc_barrier();
ret = (cycle_t)native_read_tsc();
ret = (cycle_t)rdtsc();
last = pvclock_gtod_data.clock.cycle_last;
@ -1646,7 +1646,7 @@ static int kvm_guest_time_update(struct kvm_vcpu *v)
return 1;
}
if (!use_master_clock) {
host_tsc = native_read_tsc();
host_tsc = rdtsc();
kernel_ns = get_kernel_ns();
}
@ -2810,7 +2810,7 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) {
s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
native_read_tsc() - vcpu->arch.last_host_tsc;
rdtsc() - vcpu->arch.last_host_tsc;
if (tsc_delta < 0)
mark_tsc_unstable("KVM discovered backwards TSC");
if (check_tsc_unstable()) {
@ -2838,7 +2838,7 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
kvm_x86_ops->vcpu_put(vcpu);
kvm_put_guest_fpu(vcpu);
vcpu->arch.last_host_tsc = native_read_tsc();
vcpu->arch.last_host_tsc = rdtsc();
}
static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
@ -6623,7 +6623,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
hw_breakpoint_restore();
vcpu->arch.last_guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu,
native_read_tsc());
rdtsc());
vcpu->mode = OUTSIDE_GUEST_MODE;
smp_wmb();
@ -7437,7 +7437,7 @@ int kvm_arch_hardware_enable(void)
if (ret != 0)
return ret;
local_tsc = native_read_tsc();
local_tsc = rdtsc();
stable = !check_tsc_unstable();
list_for_each_entry(kvm, &vm_list, vm_list) {
kvm_for_each_vcpu(i, vcpu, kvm) {

8
arch/x86/lib/delay.c
View File

@ -55,10 +55,10 @@ static void delay_tsc(unsigned long __loops)
preempt_disable();
cpu = smp_processor_id();
rdtsc_barrier();
bclock = native_read_tsc();
bclock = rdtsc();
for (;;) {
rdtsc_barrier();
now = native_read_tsc();
now = rdtsc();
if ((now - bclock) >= loops)
break;
@ -80,7 +80,7 @@ static void delay_tsc(unsigned long __loops)
loops -= (now - bclock);
cpu = smp_processor_id();
rdtsc_barrier();
bclock = native_read_tsc();
bclock = rdtsc();
}
}
preempt_enable();
@ -100,7 +100,7 @@ void use_tsc_delay(void)
int read_current_timer(unsigned long *timer_val)
{
if (delay_fn == delay_tsc) {
*timer_val = native_read_tsc();
*timer_val = rdtsc();
return 0;
}
return -1;

2
drivers/cpufreq/intel_pstate.c
View File

@ -765,7 +765,7 @@ static inline void intel_pstate_sample(struct cpudata *cpu)
local_irq_save(flags);
rdmsrl(MSR_IA32_APERF, aperf);
rdmsrl(MSR_IA32_MPERF, mperf);
tsc = native_read_tsc();
tsc = rdtsc();
local_irq_restore(flags);
cpu->last_sample_time = cpu->sample.time;

4
drivers/input/gameport/gameport.c
View File

@ -149,9 +149,9 @@ static int old_gameport_measure_speed(struct gameport *gameport)
for(i = 0; i < 50; i++) {
local_irq_save(flags);
t1 = native_read_tsc();
t1 = rdtsc();
for (t = 0; t < 50; t++) gameport_read(gameport);
t2 = native_read_tsc();
t2 = rdtsc();
local_irq_restore(flags);
udelay(i * 10);
if (t2 - t1 < tx) tx = t2 - t1;

4
drivers/input/joystick/analog.c
View File

@ -143,7 +143,7 @@ struct analog_port {
#include <linux/i8253.h>
#define GET_TIME(x) do { if (cpu_has_tsc) x = (unsigned int)native_read_tsc(); else x = get_time_pit(); } while (0)
#define GET_TIME(x) do { if (cpu_has_tsc) x = (unsigned int)rdtsc(); else x = get_time_pit(); } while (0)
#define DELTA(x,y) (cpu_has_tsc ? ((y) - (x)) : ((x) - (y) + ((x) < (y) ? PIT_TICK_RATE / HZ : 0)))
#define TIME_NAME (cpu_has_tsc?"TSC":"PIT")
static unsigned int get_time_pit(void)
@ -160,7 +160,7 @@ static unsigned int get_time_pit(void)
return count;
}
#elif defined(__x86_64__)
#define GET_TIME(x) do { x = (unsigned int)native_read_tsc(); } while (0)
#define GET_TIME(x) do { x = (unsigned int)rdtsc(); } while (0)
#define DELTA(x,y) ((y)-(x))
#define TIME_NAME "TSC"
#elif defined(__alpha__) || defined(CONFIG_MN10300) || defined(CONFIG_ARM) || defined(CONFIG_ARM64) || defined(CONFIG_TILE)

2
drivers/net/hamradio/baycom_epp.c
View File

@ -638,7 +638,7 @@ static int receive(struct net_device *dev, int cnt)
#define GETTICK(x) \
({ \
if (cpu_has_tsc) \
x = (unsigned int)native_read_tsc(); \
x = (unsigned int)rdtsc(); \
})
#else /* __i386__ */
#define GETTICK(x)

4
drivers/thermal/intel_powerclamp.c
View File

@ -340,7 +340,7 @@ static bool powerclamp_adjust_controls(unsigned int target_ratio,
/* check result for the last window */
msr_now = pkg_state_counter();
tsc_now = native_read_tsc();
tsc_now = rdtsc();
/* calculate pkg cstate vs tsc ratio */
if (!msr_last || !tsc_last)
@ -482,7 +482,7 @@ static void poll_pkg_cstate(struct work_struct *dummy)
u64 val64;
msr_now = pkg_state_counter();
tsc_now = native_read_tsc();
tsc_now = rdtsc();
jiffies_now = jiffies;
/* calculate pkg cstate vs tsc ratio */

4
tools/power/cpupower/debug/kernel/cpufreq-test_tsc.c
View File

@ -81,11 +81,11 @@ static int __init cpufreq_test_tsc(void)
printk(KERN_DEBUG "start--> \n");
then = read_pmtmr();
then_tsc = native_read_tsc();
then_tsc = rdtsc();
for (i=0;i<20;i++) {
mdelay(100);
now = read_pmtmr();
now_tsc = native_read_tsc();
now_tsc = rdtsc();
diff = (now - then) & 0xFFFFFF;
diff_tsc = now_tsc - then_tsc;
printk(KERN_DEBUG "t1: %08u t2: %08u diff_pmtmr: %08u diff_tsc: %016llu\n", then, now, diff, diff_tsc);