Release 4.14 arch/x86/include/asm/pvclock.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_PVCLOCK_H
#define _ASM_X86_PVCLOCK_H
#include <linux/clocksource.h>
#include <asm/pvclock-abi.h>
#ifdef CONFIG_KVM_GUEST
extern struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void);
#else
static inline struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void)
{
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Andrew Lutomirski | 14 | 100.00% | 1 | 100.00% |
| Total | 14 | 100.00% | 1 | 100.00% |
#endif
/* some helper functions for xen and kvm pv clock sources */
u64 pvclock_clocksource_read(struct pvclock_vcpu_time_info *src);
u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src);
void pvclock_set_flags(u8 flags);
unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src);
void pvclock_read_wallclock(struct pvclock_wall_clock *wall,
struct pvclock_vcpu_time_info *vcpu,
struct timespec *ts);
void pvclock_resume(void);
void pvclock_touch_watchdogs(void);
static __always_inline
unsigned pvclock_read_begin(const struct pvclock_vcpu_time_info *src)
{
unsigned version = src->version & ~1;
/* Make sure that the version is read before the data. */
virt_rmb();
return version;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Paolo Bonzini | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
static __always_inline
bool pvclock_read_retry(const struct pvclock_vcpu_time_info *src,
unsigned version)
{
/* Make sure that the version is re-read after the data. */
virt_rmb();
return unlikely(version != src->version);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Paolo Bonzini | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
/*
* Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction,
* yielding a 64-bit result.
*/
static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift)
{
u64 product;
#ifdef __i386__
u32 tmp1, tmp2;
#else
ulong tmp;
#endif
if (shift < 0)
delta >>= -shift;
else
delta <<= shift;
#ifdef __i386__
__asm__ (
"mul %5 ; "
"mov %4,%%eax ; "
"mov %%edx,%4 ; "
"mul %5 ; "
"xor %5,%5 ; "
"add %4,%%eax ; "
"adc %5,%%edx ; "
: "=A" (product), "=r" (tmp1), "=r" (tmp2)
: "a" ((u32)delta), "1" ((u32)(delta >> 32)), "2" (mul_frac) );
#elif defined(__x86_64__)
__asm__ (
"mulq %[mul_frac] ; shrd $32, %[hi], %[lo]"
: [lo]"=a"(product),
[hi]"=d"(tmp)
: "0"(delta),
[mul_frac]"rm"((u64)mul_frac));
#else
#error implement me!
#endif
return product;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Zachary Amsden | 70 | 98.59% | 2 | 66.67% |
| Duncan Sands | 1 | 1.41% | 1 | 33.33% |
| Total | 71 | 100.00% | 3 | 100.00% |
static __always_inline
u64 __pvclock_read_cycles(const struct pvclock_vcpu_time_info *src, u64 tsc)
{
u64 delta = tsc - src->tsc_timestamp;
u64 offset = pvclock_scale_delta(delta, src->tsc_to_system_mul,
src->tsc_shift);
return src->system_time + offset;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marcelo Tosatti | 22 | 45.83% | 1 | 20.00% |
| Minfei Huang | 15 | 31.25% | 1 | 20.00% |
| Paolo Bonzini | 9 | 18.75% | 2 | 40.00% |
| Thomas Gleixner | 2 | 4.17% | 1 | 20.00% |
| Total | 48 | 100.00% | 5 | 100.00% |
struct pvclock_vsyscall_time_info {
struct pvclock_vcpu_time_info pvti;
} __attribute__((__aligned__(SMP_CACHE_BYTES)));
#define PVTI_SIZE sizeof(struct pvclock_vsyscall_time_info)
#endif /* _ASM_X86_PVCLOCK_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Zachary Amsden | 71 | 22.54% | 2 | 10.53% |
| Paolo Bonzini | 69 | 21.90% | 2 | 10.53% |
| Marcelo Tosatti | 59 | 18.73% | 4 | 21.05% |
| Gerd Hoffmann | 40 | 12.70% | 1 | 5.26% |
| Andrew Lutomirski | 30 | 9.52% | 2 | 10.53% |
| Glauber de Oliveira Costa | 17 | 5.40% | 2 | 10.53% |
| Minfei Huang | 15 | 4.76% | 1 | 5.26% |
| Jeremy Fitzhardinge | 6 | 1.90% | 1 | 5.26% |
| H. Peter Anvin | 3 | 0.95% | 1 | 5.26% |
| Thomas Gleixner | 3 | 0.95% | 1 | 5.26% |
| Greg Kroah-Hartman | 1 | 0.32% | 1 | 5.26% |
| Duncan Sands | 1 | 0.32% | 1 | 5.26% |
| Total | 315 | 100.00% | 19 | 100.00% |
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