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/*-
* Copyright (c) 2012 Fabien Thomas
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/hwpmc/hwpmc_soft.c 236238 2012-05-29 14:50:21Z fabient $");
#include <sys/param.h>
#include <sys/pmc.h>
#include <sys/pmckern.h>
#include <sys/systm.h>
#include <sys/mutex.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include "hwpmc_soft.h"
/*
* Software PMC support.
*/
#define SOFT_CAPS (PMC_CAP_READ | PMC_CAP_WRITE | PMC_CAP_INTERRUPT | \
PMC_CAP_USER | PMC_CAP_SYSTEM)
struct soft_descr {
struct pmc_descr pm_descr; /* "base class" */
};
static struct soft_descr soft_pmcdesc[SOFT_NPMCS] =
{
#define SOFT_PMCDESCR(N) \
{ \
.pm_descr = \
{ \
.pd_name = #N, \
.pd_class = PMC_CLASS_SOFT, \
.pd_caps = SOFT_CAPS, \
.pd_width = 64 \
}, \
}
SOFT_PMCDESCR(SOFT0),
SOFT_PMCDESCR(SOFT1),
SOFT_PMCDESCR(SOFT2),
SOFT_PMCDESCR(SOFT3),
SOFT_PMCDESCR(SOFT4),
SOFT_PMCDESCR(SOFT5),
SOFT_PMCDESCR(SOFT6),
SOFT_PMCDESCR(SOFT7),
SOFT_PMCDESCR(SOFT8),
SOFT_PMCDESCR(SOFT9),
SOFT_PMCDESCR(SOFT10),
SOFT_PMCDESCR(SOFT11),
SOFT_PMCDESCR(SOFT12),
SOFT_PMCDESCR(SOFT13),
SOFT_PMCDESCR(SOFT14),
SOFT_PMCDESCR(SOFT15)
};
/*
* Per-CPU data structure.
*/
struct soft_cpu {
struct pmc_hw soft_hw[SOFT_NPMCS];
pmc_value_t soft_values[SOFT_NPMCS];
};
static struct soft_cpu **soft_pcpu;
static int
soft_allocate_pmc(int cpu, int ri, struct pmc *pm,
const struct pmc_op_pmcallocate *a)
{
enum pmc_event ev;
struct pmc_soft *ps;
(void) cpu;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[soft,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < SOFT_NPMCS,
("[soft,%d] illegal row-index %d", __LINE__, ri));
if (a->pm_class != PMC_CLASS_SOFT)
return (EINVAL);
if ((pm->pm_caps & SOFT_CAPS) == 0)
return (EINVAL);
if ((pm->pm_caps & ~SOFT_CAPS) != 0)
return (EPERM);
ev = pm->pm_event;
if (ev < PMC_EV_SOFT_FIRST || ev > PMC_EV_SOFT_LAST)
return (EINVAL);
/* Check if event is registered. */
ps = pmc_soft_ev_acquire(ev);
if (ps == NULL)
return (EINVAL);
pmc_soft_ev_release(ps);
return (0);
}
static int
soft_config_pmc(int cpu, int ri, struct pmc *pm)
{
struct pmc_hw *phw;
PMCDBG(MDP,CFG,1, "cpu=%d ri=%d pm=%p", cpu, ri, pm);
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[soft,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < SOFT_NPMCS,
("[soft,%d] illegal row-index %d", __LINE__, ri));
phw = &soft_pcpu[cpu]->soft_hw[ri];
KASSERT(pm == NULL || phw->phw_pmc == NULL,
("[soft,%d] pm=%p phw->pm=%p hwpmc not unconfigured", __LINE__,
pm, phw->phw_pmc));
phw->phw_pmc = pm;
return (0);
}
static int
soft_describe(int cpu, int ri, struct pmc_info *pi, struct pmc **ppmc)
{
int error;
size_t copied;
const struct soft_descr *pd;
struct pmc_hw *phw;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[soft,%d] illegal CPU %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < SOFT_NPMCS,
("[soft,%d] illegal row-index %d", __LINE__, ri));
phw = &soft_pcpu[cpu]->soft_hw[ri];
pd = &soft_pmcdesc[ri];
if ((error = copystr(pd->pm_descr.pd_name, pi->pm_name,
PMC_NAME_MAX, &copied)) != 0)
return (error);
pi->pm_class = pd->pm_descr.pd_class;
if (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) {
pi->pm_enabled = TRUE;
*ppmc = phw->phw_pmc;
} else {
pi->pm_enabled = FALSE;
*ppmc = NULL;
}
return (0);
}
static int
soft_get_config(int cpu, int ri, struct pmc **ppm)
{
(void) ri;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[soft,%d] illegal CPU %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < SOFT_NPMCS,
("[soft,%d] illegal row-index %d", __LINE__, ri));
*ppm = soft_pcpu[cpu]->soft_hw[ri].phw_pmc;
return (0);
}
static int
soft_pcpu_fini(struct pmc_mdep *md, int cpu)
{
int ri;
struct pmc_cpu *pc;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[soft,%d] illegal cpu %d", __LINE__, cpu));
KASSERT(soft_pcpu[cpu] != NULL, ("[soft,%d] null pcpu", __LINE__));
free(soft_pcpu[cpu], M_PMC);
soft_pcpu[cpu] = NULL;
ri = md->pmd_classdep[PMC_CLASS_INDEX_SOFT].pcd_ri;
KASSERT(ri >= 0 && ri < SOFT_NPMCS,
("[soft,%d] ri=%d", __LINE__, ri));
pc = pmc_pcpu[cpu];
pc->pc_hwpmcs[ri] = NULL;
return (0);
}
static int
soft_pcpu_init(struct pmc_mdep *md, int cpu)
{
int first_ri, n;
struct pmc_cpu *pc;
struct soft_cpu *soft_pc;
struct pmc_hw *phw;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[soft,%d] illegal cpu %d", __LINE__, cpu));
KASSERT(soft_pcpu, ("[soft,%d] null pcpu", __LINE__));
KASSERT(soft_pcpu[cpu] == NULL, ("[soft,%d] non-null per-cpu",
__LINE__));
soft_pc = malloc(sizeof(struct soft_cpu), M_PMC, M_WAITOK|M_ZERO);
if (soft_pc == NULL)
return (ENOMEM);
pc = pmc_pcpu[cpu];
KASSERT(pc != NULL, ("[soft,%d] cpu %d null per-cpu", __LINE__, cpu));
soft_pcpu[cpu] = soft_pc;
phw = soft_pc->soft_hw;
first_ri = md->pmd_classdep[PMC_CLASS_INDEX_SOFT].pcd_ri;
for (n = 0; n < SOFT_NPMCS; n++, phw++) {
phw->phw_state = PMC_PHW_FLAG_IS_ENABLED |
PMC_PHW_CPU_TO_STATE(cpu) | PMC_PHW_INDEX_TO_STATE(n);
phw->phw_pmc = NULL;
pc->pc_hwpmcs[n + first_ri] = phw;
}
return (0);
}
static int
soft_read_pmc(int cpu, int ri, pmc_value_t *v)
{
struct pmc *pm;
const struct pmc_hw *phw;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[soft,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < SOFT_NPMCS,
("[soft,%d] illegal row-index %d", __LINE__, ri));
phw = &soft_pcpu[cpu]->soft_hw[ri];
pm = phw->phw_pmc;
KASSERT(pm != NULL,
("[soft,%d] no owner for PHW [cpu%d,pmc%d]", __LINE__, cpu, ri));
PMCDBG(MDP,REA,1,"soft-read id=%d", ri);
*v = soft_pcpu[cpu]->soft_values[ri];
return (0);
}
static int
soft_write_pmc(int cpu, int ri, pmc_value_t v)
{
struct pmc *pm;
const struct soft_descr *pd;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[soft,%d] illegal cpu value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < SOFT_NPMCS,
("[soft,%d] illegal row-index %d", __LINE__, ri));
pm = soft_pcpu[cpu]->soft_hw[ri].phw_pmc;
pd = &soft_pmcdesc[ri];
KASSERT(pm,
("[soft,%d] cpu %d ri %d pmc not configured", __LINE__, cpu, ri));
PMCDBG(MDP,WRI,1, "soft-write cpu=%d ri=%d v=%jx", cpu, ri, v);
soft_pcpu[cpu]->soft_values[ri] = v;
return (0);
}
static int
soft_release_pmc(int cpu, int ri, struct pmc *pmc)
{
struct pmc_hw *phw;
(void) pmc;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[soft,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < SOFT_NPMCS,
("[soft,%d] illegal row-index %d", __LINE__, ri));
phw = &soft_pcpu[cpu]->soft_hw[ri];
KASSERT(phw->phw_pmc == NULL,
("[soft,%d] PHW pmc %p non-NULL", __LINE__, phw->phw_pmc));
/*
* Nothing to do.
*/
return (0);
}
static int
soft_start_pmc(int cpu, int ri)
{
struct pmc *pm;
struct soft_cpu *pc;
struct pmc_soft *ps;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[soft,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < SOFT_NPMCS,
("[soft,%d] illegal row-index %d", __LINE__, ri));
pc = soft_pcpu[cpu];
pm = pc->soft_hw[ri].phw_pmc;
KASSERT(pm,
("[soft,%d] cpu %d ri %d pmc not configured", __LINE__, cpu, ri));
ps = pmc_soft_ev_acquire(pm->pm_event);
if (ps == NULL)
return (EINVAL);
atomic_add_int(&ps->ps_running, 1);
pmc_soft_ev_release(ps);
return (0);
}
static int
soft_stop_pmc(int cpu, int ri)
{
struct pmc *pm;
struct soft_cpu *pc;
struct pmc_soft *ps;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[soft,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < SOFT_NPMCS,
("[soft,%d] illegal row-index %d", __LINE__, ri));
pc = soft_pcpu[cpu];
pm = pc->soft_hw[ri].phw_pmc;
KASSERT(pm,
("[soft,%d] cpu %d ri %d pmc not configured", __LINE__, cpu, ri));
ps = pmc_soft_ev_acquire(pm->pm_event);
/* event unregistered ? */
if (ps != NULL) {
atomic_subtract_int(&ps->ps_running, 1);
pmc_soft_ev_release(ps);
}
return (0);
}
int
pmc_soft_intr(struct pmckern_soft *ks)
{
struct pmc *pm;
struct soft_cpu *pc;
int ri, processed, error, user_mode;
KASSERT(ks->pm_cpu >= 0 && ks->pm_cpu < pmc_cpu_max(),
("[soft,%d] CPU %d out of range", __LINE__, ks->pm_cpu));
processed = 0;
pc = soft_pcpu[ks->pm_cpu];
for (ri = 0; ri < SOFT_NPMCS; ri++) {
pm = pc->soft_hw[ri].phw_pmc;
if (pm == NULL ||
pm->pm_state != PMC_STATE_RUNNING ||
pm->pm_event != ks->pm_ev) {
continue;
}
processed = 1;
pc->soft_values[ri]++;
if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) {
user_mode = TRAPF_USERMODE(ks->pm_tf);
error = pmc_process_interrupt(ks->pm_cpu, PMC_SR, pm,
ks->pm_tf, user_mode);
if (error) {
soft_stop_pmc(ks->pm_cpu, ri);
continue;
}
if (user_mode) {
/* If in user mode setup AST to process
* callchain out of interrupt context.
*/
curthread->td_flags |= TDF_ASTPENDING;
}
}
}
atomic_add_int(processed ? &pmc_stats.pm_intr_processed :
&pmc_stats.pm_intr_ignored, 1);
return (processed);
}
void
pmc_soft_initialize(struct pmc_mdep *md)
{
struct pmc_classdep *pcd;
/* Add SOFT PMCs. */
soft_pcpu = malloc(sizeof(struct soft_cpu *) * pmc_cpu_max(), M_PMC,
M_ZERO|M_WAITOK);
pcd = &md->pmd_classdep[PMC_CLASS_INDEX_SOFT];
pcd->pcd_caps = SOFT_CAPS;
pcd->pcd_class = PMC_CLASS_SOFT;
pcd->pcd_num = SOFT_NPMCS;
pcd->pcd_ri = md->pmd_npmc;
pcd->pcd_width = 64;
pcd->pcd_allocate_pmc = soft_allocate_pmc;
pcd->pcd_config_pmc = soft_config_pmc;
pcd->pcd_describe = soft_describe;
pcd->pcd_get_config = soft_get_config;
pcd->pcd_get_msr = NULL;
pcd->pcd_pcpu_init = soft_pcpu_init;
pcd->pcd_pcpu_fini = soft_pcpu_fini;
pcd->pcd_read_pmc = soft_read_pmc;
pcd->pcd_write_pmc = soft_write_pmc;
pcd->pcd_release_pmc = soft_release_pmc;
pcd->pcd_start_pmc = soft_start_pmc;
pcd->pcd_stop_pmc = soft_stop_pmc;
md->pmd_npmc += SOFT_NPMCS;
}
void
pmc_soft_finalize(struct pmc_mdep *md)
{
#ifdef INVARIANTS
int i, ncpus;
ncpus = pmc_cpu_max();
for (i = 0; i < ncpus; i++)
KASSERT(soft_pcpu[i] == NULL, ("[soft,%d] non-null pcpu cpu %d",
__LINE__, i));
KASSERT(md->pmd_classdep[PMC_CLASS_INDEX_SOFT].pcd_class ==
PMC_CLASS_SOFT, ("[soft,%d] class mismatch", __LINE__));
#endif
free(soft_pcpu, M_PMC);
soft_pcpu = NULL;
}