Merge commit 'v2.6.26-rc8' into x86/xen
Conflicts: arch/x86/xen/enlighten.c arch/x86/xen/mmu.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
@ -14,6 +14,7 @@
|
||||
#include <linux/kernel_stat.h>
|
||||
#include <linux/math64.h>
|
||||
|
||||
#include <asm/pvclock.h>
|
||||
#include <asm/xen/hypervisor.h>
|
||||
#include <asm/xen/hypercall.h>
|
||||
|
||||
@ -31,17 +32,6 @@
|
||||
|
||||
static cycle_t xen_clocksource_read(void);
|
||||
|
||||
/* These are perodically updated in shared_info, and then copied here. */
|
||||
struct shadow_time_info {
|
||||
u64 tsc_timestamp; /* TSC at last update of time vals. */
|
||||
u64 system_timestamp; /* Time, in nanosecs, since boot. */
|
||||
u32 tsc_to_nsec_mul;
|
||||
int tsc_shift;
|
||||
u32 version;
|
||||
};
|
||||
|
||||
static DEFINE_PER_CPU(struct shadow_time_info, shadow_time);
|
||||
|
||||
/* runstate info updated by Xen */
|
||||
static DEFINE_PER_CPU(struct vcpu_runstate_info, runstate);
|
||||
|
||||
@ -211,7 +201,7 @@ unsigned long long xen_sched_clock(void)
|
||||
unsigned long xen_cpu_khz(void)
|
||||
{
|
||||
u64 xen_khz = 1000000ULL << 32;
|
||||
const struct vcpu_time_info *info =
|
||||
const struct pvclock_vcpu_time_info *info =
|
||||
&HYPERVISOR_shared_info->vcpu_info[0].time;
|
||||
|
||||
do_div(xen_khz, info->tsc_to_system_mul);
|
||||
@ -223,121 +213,26 @@ unsigned long xen_cpu_khz(void)
|
||||
return xen_khz;
|
||||
}
|
||||
|
||||
/*
|
||||
* Reads a consistent set of time-base values from Xen, into a shadow data
|
||||
* area.
|
||||
*/
|
||||
static unsigned get_time_values_from_xen(void)
|
||||
{
|
||||
struct vcpu_time_info *src;
|
||||
struct shadow_time_info *dst;
|
||||
|
||||
/* src is shared memory with the hypervisor, so we need to
|
||||
make sure we get a consistent snapshot, even in the face of
|
||||
being preempted. */
|
||||
src = &__get_cpu_var(xen_vcpu)->time;
|
||||
dst = &__get_cpu_var(shadow_time);
|
||||
|
||||
do {
|
||||
dst->version = src->version;
|
||||
rmb(); /* fetch version before data */
|
||||
dst->tsc_timestamp = src->tsc_timestamp;
|
||||
dst->system_timestamp = src->system_time;
|
||||
dst->tsc_to_nsec_mul = src->tsc_to_system_mul;
|
||||
dst->tsc_shift = src->tsc_shift;
|
||||
rmb(); /* test version after fetching data */
|
||||
} while ((src->version & 1) | (dst->version ^ src->version));
|
||||
|
||||
return dst->version;
|
||||
}
|
||||
|
||||
/*
|
||||
* Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction,
|
||||
* yielding a 64-bit result.
|
||||
*/
|
||||
static inline u64 scale_delta(u64 delta, u32 mul_frac, int shift)
|
||||
{
|
||||
u64 product;
|
||||
#ifdef __i386__
|
||||
u32 tmp1, tmp2;
|
||||
#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 __x86_64__
|
||||
__asm__ (
|
||||
"mul %%rdx ; shrd $32,%%rdx,%%rax"
|
||||
: "=a" (product) : "0" (delta), "d" ((u64)mul_frac) );
|
||||
#else
|
||||
#error implement me!
|
||||
#endif
|
||||
|
||||
return product;
|
||||
}
|
||||
|
||||
static u64 get_nsec_offset(struct shadow_time_info *shadow)
|
||||
{
|
||||
u64 now, delta;
|
||||
now = native_read_tsc();
|
||||
delta = now - shadow->tsc_timestamp;
|
||||
return scale_delta(delta, shadow->tsc_to_nsec_mul, shadow->tsc_shift);
|
||||
}
|
||||
|
||||
static cycle_t xen_clocksource_read(void)
|
||||
{
|
||||
struct shadow_time_info *shadow = &get_cpu_var(shadow_time);
|
||||
struct pvclock_vcpu_time_info *src;
|
||||
cycle_t ret;
|
||||
unsigned version;
|
||||
|
||||
do {
|
||||
version = get_time_values_from_xen();
|
||||
barrier();
|
||||
ret = shadow->system_timestamp + get_nsec_offset(shadow);
|
||||
barrier();
|
||||
} while (version != __get_cpu_var(xen_vcpu)->time.version);
|
||||
|
||||
put_cpu_var(shadow_time);
|
||||
|
||||
src = &get_cpu_var(xen_vcpu)->time;
|
||||
ret = pvclock_clocksource_read(src);
|
||||
put_cpu_var(xen_vcpu);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void xen_read_wallclock(struct timespec *ts)
|
||||
{
|
||||
const struct shared_info *s = HYPERVISOR_shared_info;
|
||||
u32 version;
|
||||
u64 delta;
|
||||
struct timespec now;
|
||||
struct shared_info *s = HYPERVISOR_shared_info;
|
||||
struct pvclock_wall_clock *wall_clock = &(s->wc);
|
||||
struct pvclock_vcpu_time_info *vcpu_time;
|
||||
|
||||
/* get wallclock at system boot */
|
||||
do {
|
||||
version = s->wc_version;
|
||||
rmb(); /* fetch version before time */
|
||||
now.tv_sec = s->wc_sec;
|
||||
now.tv_nsec = s->wc_nsec;
|
||||
rmb(); /* fetch time before checking version */
|
||||
} while ((s->wc_version & 1) | (version ^ s->wc_version));
|
||||
|
||||
delta = xen_clocksource_read(); /* time since system boot */
|
||||
delta += now.tv_sec * (u64)NSEC_PER_SEC + now.tv_nsec;
|
||||
|
||||
now.tv_nsec = do_div(delta, NSEC_PER_SEC);
|
||||
now.tv_sec = delta;
|
||||
|
||||
set_normalized_timespec(ts, now.tv_sec, now.tv_nsec);
|
||||
vcpu_time = &get_cpu_var(xen_vcpu)->time;
|
||||
pvclock_read_wallclock(wall_clock, vcpu_time, ts);
|
||||
put_cpu_var(xen_vcpu);
|
||||
}
|
||||
|
||||
unsigned long xen_get_wallclock(void)
|
||||
@ -345,7 +240,6 @@ unsigned long xen_get_wallclock(void)
|
||||
struct timespec ts;
|
||||
|
||||
xen_read_wallclock(&ts);
|
||||
|
||||
return ts.tv_sec;
|
||||
}
|
||||
|
||||
@ -582,8 +476,6 @@ __init void xen_time_init(void)
|
||||
{
|
||||
int cpu = smp_processor_id();
|
||||
|
||||
get_time_values_from_xen();
|
||||
|
||||
clocksource_register(&xen_clocksource);
|
||||
|
||||
if (HYPERVISOR_vcpu_op(VCPUOP_stop_periodic_timer, cpu, NULL) == 0) {
|
||||
|
Reference in New Issue
Block a user