9f79feec16
register_t, so pointers to it must be passed around as `register_t *', not as `int *'. The type mismatches were non-benign on alphas, but the broken code is normally only configured by LINT.
265 lines
6.0 KiB
C
265 lines
6.0 KiB
C
/*
|
|
* Copyright (c) 1996, 1997
|
|
* HD Associates, Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by HD Associates, Inc
|
|
* 4. Neither the name of the author nor the names of any co-contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/* ksched: Soft real time scheduling based on "rtprio".
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/resource.h>
|
|
#include <machine/cpu.h> /* For need_resched */
|
|
|
|
#include <posix4/posix4.h>
|
|
|
|
/* ksched: Real-time extension to support POSIX priority scheduling.
|
|
*/
|
|
|
|
struct ksched {
|
|
struct timespec rr_interval;
|
|
};
|
|
|
|
int ksched_attach(struct ksched **p)
|
|
{
|
|
struct ksched *ksched= p31b_malloc(sizeof(*ksched));
|
|
|
|
ksched->rr_interval.tv_sec = 0;
|
|
ksched->rr_interval.tv_nsec = 1000000000L / roundrobin_interval();
|
|
|
|
*p = ksched;
|
|
return 0;
|
|
}
|
|
|
|
int ksched_detach(struct ksched *p)
|
|
{
|
|
p31b_free(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* XXX About priorities
|
|
*
|
|
* POSIX 1003.1b requires that numerically higher priorities be of
|
|
* higher priority. It also permits sched_setparam to be
|
|
* implementation defined for SCHED_OTHER. I don't like
|
|
* the notion of inverted priorites for normal processes when
|
|
* you can use "setpriority" for that.
|
|
*
|
|
* I'm rejecting sched_setparam for SCHED_OTHER with EINVAL.
|
|
*/
|
|
|
|
/* Macros to convert between the unix (lower numerically is higher priority)
|
|
* and POSIX 1003.1b (higher numerically is higher priority)
|
|
*/
|
|
|
|
#define p4prio_to_rtpprio(P) (RTP_PRIO_MAX - (P))
|
|
#define rtpprio_to_p4prio(P) (RTP_PRIO_MAX - (P))
|
|
|
|
/* These improve readability a bit for me:
|
|
*/
|
|
#define P1B_PRIO_MIN rtpprio_to_p4prio(RTP_PRIO_MAX)
|
|
#define P1B_PRIO_MAX rtpprio_to_p4prio(RTP_PRIO_MIN)
|
|
|
|
static __inline int
|
|
getscheduler(register_t *ret, struct ksched *ksched, struct proc *p)
|
|
{
|
|
int e = 0;
|
|
|
|
switch (p->p_rtprio.type)
|
|
{
|
|
case RTP_PRIO_FIFO:
|
|
*ret = SCHED_FIFO;
|
|
break;
|
|
|
|
case RTP_PRIO_REALTIME:
|
|
*ret = SCHED_RR;
|
|
break;
|
|
|
|
default:
|
|
*ret = SCHED_OTHER;
|
|
break;
|
|
}
|
|
|
|
return e;
|
|
}
|
|
|
|
int ksched_setparam(register_t *ret, struct ksched *ksched,
|
|
struct proc *p, const struct sched_param *param)
|
|
{
|
|
register_t policy;
|
|
int e;
|
|
|
|
e = getscheduler(&policy, ksched, p);
|
|
|
|
if (e == 0)
|
|
{
|
|
if (policy == SCHED_OTHER)
|
|
e = EINVAL;
|
|
else
|
|
e = ksched_setscheduler(ret, ksched, p, policy, param);
|
|
}
|
|
|
|
return e;
|
|
}
|
|
|
|
int ksched_getparam(register_t *ret, struct ksched *ksched,
|
|
struct proc *p, struct sched_param *param)
|
|
{
|
|
if (RTP_PRIO_IS_REALTIME(p->p_rtprio.type))
|
|
param->sched_priority = rtpprio_to_p4prio(p->p_rtprio.prio);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* XXX The priority and scheduler modifications should
|
|
* be moved into published interfaces in kern/kern_sync.
|
|
*
|
|
* The permissions to modify process p were checked in "p31b_proc()".
|
|
*
|
|
*/
|
|
int ksched_setscheduler(register_t *ret, struct ksched *ksched,
|
|
struct proc *p, int policy, const struct sched_param *param)
|
|
{
|
|
int e = 0;
|
|
struct rtprio rtp;
|
|
|
|
switch(policy)
|
|
{
|
|
case SCHED_RR:
|
|
case SCHED_FIFO:
|
|
|
|
if (param->sched_priority >= P1B_PRIO_MIN &&
|
|
param->sched_priority <= P1B_PRIO_MAX)
|
|
{
|
|
rtp.prio = p4prio_to_rtpprio(param->sched_priority);
|
|
rtp.type = (policy == SCHED_FIFO)
|
|
? RTP_PRIO_FIFO : RTP_PRIO_REALTIME;
|
|
|
|
p->p_rtprio = rtp;
|
|
need_resched();
|
|
}
|
|
else
|
|
e = EPERM;
|
|
|
|
|
|
break;
|
|
|
|
case SCHED_OTHER:
|
|
{
|
|
rtp.type = RTP_PRIO_NORMAL;
|
|
rtp.prio = p4prio_to_rtpprio(param->sched_priority);
|
|
p->p_rtprio = rtp;
|
|
|
|
/* XXX Simply revert to whatever we had for last
|
|
* normal scheduler priorities.
|
|
* This puts a requirement
|
|
* on the scheduling code: You must leave the
|
|
* scheduling info alone.
|
|
*/
|
|
need_resched();
|
|
}
|
|
break;
|
|
}
|
|
|
|
return e;
|
|
}
|
|
|
|
int ksched_getscheduler(register_t *ret, struct ksched *ksched, struct proc *p)
|
|
{
|
|
return getscheduler(ret, ksched, p);
|
|
}
|
|
|
|
/* ksched_yield: Yield the CPU.
|
|
*/
|
|
int ksched_yield(register_t *ret, struct ksched *ksched)
|
|
{
|
|
need_resched();
|
|
return 0;
|
|
}
|
|
|
|
int ksched_get_priority_max(register_t*ret, struct ksched *ksched, int policy)
|
|
{
|
|
int e = 0;
|
|
|
|
switch (policy)
|
|
{
|
|
case SCHED_FIFO:
|
|
case SCHED_RR:
|
|
*ret = RTP_PRIO_MAX;
|
|
break;
|
|
|
|
case SCHED_OTHER:
|
|
*ret = PRIO_MAX;
|
|
break;
|
|
|
|
default:
|
|
e = EINVAL;
|
|
}
|
|
|
|
return e;
|
|
}
|
|
|
|
int ksched_get_priority_min(register_t *ret, struct ksched *ksched, int policy)
|
|
{
|
|
int e = 0;
|
|
|
|
switch (policy)
|
|
{
|
|
case SCHED_FIFO:
|
|
case SCHED_RR:
|
|
*ret = P1B_PRIO_MIN;
|
|
break;
|
|
|
|
case SCHED_OTHER:
|
|
*ret = PRIO_MIN;
|
|
break;
|
|
|
|
default:
|
|
e = EINVAL;
|
|
}
|
|
|
|
return e;
|
|
}
|
|
|
|
int ksched_rr_get_interval(register_t *ret, struct ksched *ksched,
|
|
struct proc *p, struct timespec *timespec)
|
|
{
|
|
*timespec = ksched->rr_interval;
|
|
|
|
return 0;
|
|
}
|