688340ea34
The tsc-based get_scheduled_cycles interface is not a good match for Xen's runstate accounting, which reports everything in nanoseconds. This patch replaces this interface with a sched_clock interface, which matches both Xen and VMI's requirements. In order to do this, we: 1. replace get_scheduled_cycles with sched_clock 2. hoist cycles_2_ns into a common header 3. update vmi accordingly One thing to note: because sched_clock is implemented as a weak function in kernel/sched.c, we must define a real function in order to override this weak binding. This means the usual paravirt_ops technique of using an inline function won't work in this case. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Zachary Amsden <zach@vmware.com> Cc: Dan Hecht <dhecht@vmware.com> Cc: john stultz <johnstul@us.ibm.com>
98 lines
3.1 KiB
C
98 lines
3.1 KiB
C
/*
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* VMI Time wrappers
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*
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* Copyright (C) 2006, VMware, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to dhecht@vmware.com
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*
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*/
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#ifndef __VMI_TIME_H
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#define __VMI_TIME_H
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/*
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* Raw VMI call indices for timer functions
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*/
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#define VMI_CALL_GetCycleFrequency 66
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#define VMI_CALL_GetCycleCounter 67
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#define VMI_CALL_SetAlarm 68
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#define VMI_CALL_CancelAlarm 69
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#define VMI_CALL_GetWallclockTime 70
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#define VMI_CALL_WallclockUpdated 71
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/* Cached VMI timer operations */
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extern struct vmi_timer_ops {
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u64 (*get_cycle_frequency)(void);
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u64 (*get_cycle_counter)(int);
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u64 (*get_wallclock)(void);
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int (*wallclock_updated)(void);
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void (*set_alarm)(u32 flags, u64 expiry, u64 period);
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void (*cancel_alarm)(u32 flags);
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} vmi_timer_ops;
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/* Prototypes */
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extern void __init vmi_time_init(void);
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extern unsigned long vmi_get_wallclock(void);
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extern int vmi_set_wallclock(unsigned long now);
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extern unsigned long long vmi_sched_clock(void);
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extern unsigned long vmi_cpu_khz(void);
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#ifdef CONFIG_X86_LOCAL_APIC
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extern void __devinit vmi_time_bsp_init(void);
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extern void __devinit vmi_time_ap_init(void);
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#endif
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/*
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* When run under a hypervisor, a vcpu is always in one of three states:
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* running, halted, or ready. The vcpu is in the 'running' state if it
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* is executing. When the vcpu executes the halt interface, the vcpu
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* enters the 'halted' state and remains halted until there is some work
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* pending for the vcpu (e.g. an alarm expires, host I/O completes on
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* behalf of virtual I/O). At this point, the vcpu enters the 'ready'
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* state (waiting for the hypervisor to reschedule it). Finally, at any
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* time when the vcpu is not in the 'running' state nor the 'halted'
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* state, it is in the 'ready' state.
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*
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* Real time is advances while the vcpu is 'running', 'ready', or
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* 'halted'. Stolen time is the time in which the vcpu is in the
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* 'ready' state. Available time is the remaining time -- the vcpu is
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* either 'running' or 'halted'.
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*
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* All three views of time are accessible through the VMI cycle
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* counters.
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*/
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/* The cycle counters. */
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#define VMI_CYCLES_REAL 0
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#define VMI_CYCLES_AVAILABLE 1
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#define VMI_CYCLES_STOLEN 2
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/* The alarm interface 'flags' bits */
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#define VMI_ALARM_COUNTERS 2
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#define VMI_ALARM_COUNTER_MASK 0x000000ff
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#define VMI_ALARM_WIRED_IRQ0 0x00000000
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#define VMI_ALARM_WIRED_LVTT 0x00010000
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#define VMI_ALARM_IS_ONESHOT 0x00000000
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#define VMI_ALARM_IS_PERIODIC 0x00000100
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#define CONFIG_VMI_ALARM_HZ 100
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#endif
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