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When sleeping in Sx state using MWAIT instruction, accept fast wakeup

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requests from writes to the monitored line.

Submitted by:	avg
This commit is contained in:
Konstantin Belousov 2015-05-19 14:21:00 +00:00
parent 7f36f2d0e4
commit d9e8bbb64d
1 changed files with 17 additions and 6 deletions
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23
sys/x86/x86/cpu_machdep.c
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@ -101,6 +101,10 @@ __FBSDID("$FreeBSD$");
#include <vm/vm_pager.h>
#include <vm/vm_param.h>
#define STATE_RUNNING 0x0
#define STATE_MWAIT 0x1
#define STATE_SLEEPING 0x2
/*
* Machine dependent boot() routine
*
@ -134,13 +138,24 @@ acpi_cpu_idle_mwait(uint32_t mwait_hint)
{
int *state;
state = (int *)PCPU_PTR(monitorbuf);
/*
* XXXKIB. Software coordination mode should be supported,
* but all Intel CPUs provide hardware coordination.
*/
state = (int *)PCPU_PTR(monitorbuf);
KASSERT(*state == STATE_SLEEPING,
("cpu_mwait_cx: wrong monitorbuf state"));
*state = STATE_MWAIT;
cpu_monitor(state, 0, 0);
cpu_mwait(MWAIT_INTRBREAK, mwait_hint);
if (*state == STATE_MWAIT)
cpu_mwait(MWAIT_INTRBREAK, mwait_hint);
/*
* We should exit on any event that interrupts mwait, because
* that event might be a wanted interrupt.
*/
*state = STATE_RUNNING;
}
/* Get current clock frequency for the given cpu id. */
@ -231,10 +246,6 @@ static int idle_mwait = 1; /* Use MONITOR/MWAIT for short idle. */
SYSCTL_INT(_machdep, OID_AUTO, idle_mwait, CTLFLAG_RWTUN, &idle_mwait,
0, "Use MONITOR/MWAIT for short idle");
#define STATE_RUNNING 0x0
#define STATE_MWAIT 0x1
#define STATE_SLEEPING 0x2
#ifndef PC98
static void
cpu_idle_acpi(sbintime_t sbt)