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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e0bb864397
Convert VMI timer to use clock events, making it properly able to use the NO_HZ infrastructure. On UP systems, with no local APIC, we just continue to route these events through the PIT. On systems with a local APIC, or SMP, we provide a single source interrupt chip which creates the local timer IRQ. It actually gets delivered by the APIC hardware, but we don't want to use the same local APIC clocksource processing, so we create our own handler here. Signed-off-by: Zachary Amsden <zach@vmware.com> Signed-off-by: Andi Kleen <ak@suse.de> CC: Dan Hecht <dhecht@vmware.com> CC: Ingo Molnar <mingo@elte.hu> CC: Thomas Gleixner <tglx@linutronix.de>
99 lines
3.2 KiB
C
99 lines
3.2 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_get_sched_cycles(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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