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/* $OpenBSD: dt_prov_profile.c,v 1.4 2021/09/03 16:45:45 jasper Exp $ */
/*
* Copyright (c) 2019 Martin Pieuchot <mpi@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/param.h>
#include <sys/atomic.h>
#include <dev/dt/dtvar.h>
struct dt_probe *dtpp_profile; /* per-CPU profile probe */
struct dt_probe *dtpp_interval; /* global periodic probe */
/* Flags that make sense for this provider */
#define DTEVT_PROV_PROFILE DTEVT_KSTACK
int dt_prov_profile_alloc(struct dt_probe *, struct dt_softc *,
struct dt_pcb_list *, struct dtioc_req *);
int dt_prov_profile_enter(struct dt_provider *, ...);
int dt_prov_interval_enter(struct dt_provider *, ...);
struct dt_provider dt_prov_profile = {
.dtpv_name = "profile",
.dtpv_alloc = dt_prov_profile_alloc,
.dtpv_enter = dt_prov_profile_enter,
.dtpv_leave = NULL,
.dtpv_dealloc = NULL,
};
struct dt_provider dt_prov_interval = {
.dtpv_name = "interval",
.dtpv_alloc = dt_prov_profile_alloc,
.dtpv_enter = dt_prov_interval_enter,
.dtpv_leave = NULL,
.dtpv_dealloc = NULL,
};
int
dt_prov_profile_init(void)
{
dtpp_profile = dt_dev_alloc_probe("hz", "97", &dt_prov_profile);
dt_dev_register_probe(dtpp_profile);
if (dtpp_profile == NULL)
return 0;
dtpp_interval = dt_dev_alloc_probe("hz", "1", &dt_prov_interval);
dt_dev_register_probe(dtpp_interval);
if (dtpp_interval == NULL)
return 1;
return 2;
}
int
dt_prov_profile_alloc(struct dt_probe *dtp, struct dt_softc *sc,
struct dt_pcb_list *plist, struct dtioc_req *dtrq)
{
struct dt_pcb *dp;
struct cpu_info *ci;
CPU_INFO_ITERATOR cii;
extern int hz;
KASSERT(dtioc_req_isvalid(dtrq));
KASSERT(TAILQ_EMPTY(plist));
KASSERT(dtp == dtpp_profile || dtp == dtpp_interval);
if (dtrq->dtrq_rate <= 0 || dtrq->dtrq_rate > hz)
return EOPNOTSUPP;
CPU_INFO_FOREACH(cii, ci) {
if (!CPU_IS_PRIMARY(ci) && (dtp == dtpp_interval))
continue;
dp = dt_pcb_alloc(dtp, sc);
if (dp == NULL) {
dt_pcb_purge(plist);
return ENOMEM;
}
dp->dp_maxtick = hz / dtrq->dtrq_rate;
dp->dp_cpuid = ci->ci_cpuid;
dp->dp_filter = dtrq->dtrq_filter;
dp->dp_evtflags = dtrq->dtrq_evtflags & DTEVT_PROV_PROFILE;
TAILQ_INSERT_HEAD(plist, dp, dp_snext);
}
return 0;
}
static inline void
dt_prov_profile_fire(struct dt_pcb *dp)
{
struct dt_evt *dtev;
if (++dp->dp_nticks < dp->dp_maxtick)
return;
dtev = dt_pcb_ring_get(dp, 1);
if (dtev == NULL)
return;
dt_pcb_ring_consume(dp, dtev);
dp->dp_nticks = 0;
}
int
dt_prov_profile_enter(struct dt_provider *dtpv, ...)
{
struct cpu_info *ci = curcpu();
struct dt_pcb *dp;
KASSERT(dtpv == &dt_prov_profile);
smr_read_enter();
SMR_SLIST_FOREACH(dp, &dtpp_profile->dtp_pcbs, dp_pnext) {
if (dp->dp_cpuid != ci->ci_cpuid)
continue;
dt_prov_profile_fire(dp);
}
smr_read_leave();
return 0;
}
int
dt_prov_interval_enter(struct dt_provider *dtpv, ...)
{
struct dt_pcb *dp;
KASSERT(dtpv == &dt_prov_interval);
smr_read_enter();
SMR_SLIST_FOREACH(dp, &dtpp_interval->dtp_pcbs, dp_pnext) {
dt_prov_profile_fire(dp);
}
smr_read_leave();
return 0;
}
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