/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2011,2013 Justin Hibbits
* Copyright (c) 2005, Joseph Koshy
* 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/pmc.h>
#include <sys/pmckern.h>
#include <sys/sysent.h>
#include <sys/syslog.h>
#include <sys/systm.h>
#include <machine/pmc_mdep.h>
#include <machine/spr.h>
#include <machine/pte.h>
#include <machine/sr.h>
#include <machine/cpu.h>
#include <machine/stack.h>
#include "hwpmc_powerpc.h"
#ifdef __powerpc64__
#define OFFSET 4 /* Account for the TOC reload slot */
#else
#define OFFSET 0
#endif
struct powerpc_cpu **powerpc_pcpu;
struct pmc_ppc_event *ppc_event_codes;
size_t ppc_event_codes_size;
int ppc_event_first;
int ppc_event_last;
int ppc_max_pmcs;
void (*powerpc_set_pmc)(int cpu, int ri, int config);
pmc_value_t (*powerpc_pmcn_read)(unsigned int pmc);
void (*powerpc_pmcn_write)(unsigned int pmc, uint32_t val);
void (*powerpc_resume_pmc)(bool ie);
int
pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples,
struct trapframe *tf)
{
uintptr_t *osp, *sp;
uintptr_t pc;
int frames = 0;
cc[frames++] = PMC_TRAPFRAME_TO_PC(tf);
sp = (uintptr_t *)PMC_TRAPFRAME_TO_FP(tf);
osp = (uintptr_t *)PAGE_SIZE;
for (; frames < maxsamples; frames++) {
if (sp <= osp)
break;
#ifdef __powerpc64__
pc = sp[2];
#else
pc = sp[1];
#endif
if ((pc & 3) || (pc < 0x100))
break;
/*
* trapexit() and asttrapexit() are sentinels
* for kernel stack tracing.
* */
if (pc + OFFSET == (uintptr_t) &trapexit ||
pc + OFFSET == (uintptr_t) &asttrapexit)
break;
cc[frames] = pc;
osp = sp;
sp = (uintptr_t *)*sp;
}
return (frames);
}
static int
powerpc_switch_in(struct pmc_cpu *pc, struct pmc_process *pp)
{
return (0);
}
static int
powerpc_switch_out(struct pmc_cpu *pc, struct pmc_process *pp)
{
return (0);
}
int
powerpc_describe(int cpu, int ri, struct pmc_info *pi, struct pmc **ppmc)
{
int error;
struct pmc_hw *phw;
char powerpc_name[PMC_NAME_MAX];
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[powerpc,%d], illegal CPU %d", __LINE__, cpu));
phw = &powerpc_pcpu[cpu]->pc_ppcpmcs[ri];
snprintf(powerpc_name, sizeof(powerpc_name), "POWERPC-%d", ri);
if ((error = copystr(powerpc_name, pi->pm_name, PMC_NAME_MAX,
NULL)) != 0)
return error;
pi->pm_class = powerpc_pcpu[cpu]->pc_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);
}
int
powerpc_get_config(int cpu, int ri, struct pmc **ppm)
{
*ppm = powerpc_pcpu[cpu]->pc_ppcpmcs[ri].phw_pmc;
return (0);
}
int
powerpc_pcpu_init(struct pmc_mdep *md, int cpu)
{
struct pmc_cpu *pc;
struct powerpc_cpu *pac;
struct pmc_hw *phw;
int first_ri, i;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[powerpc,%d] wrong cpu number %d", __LINE__, cpu));
PMCDBG1(MDP,INI,1,"powerpc-init cpu=%d", cpu);
powerpc_pcpu[cpu] = pac = malloc(sizeof(struct powerpc_cpu), M_PMC,
M_WAITOK|M_ZERO);
pac->pc_ppcpmcs = malloc(sizeof(struct pmc_hw) * ppc_max_pmcs,
M_PMC, M_WAITOK|M_ZERO);
pac->pc_class =
md->pmd_classdep[PMC_MDEP_CLASS_INDEX_POWERPC].pcd_class;
pc = pmc_pcpu[cpu];
first_ri = md->pmd_classdep[PMC_MDEP_CLASS_INDEX_POWERPC].pcd_ri;
KASSERT(pc != NULL, ("[powerpc,%d] NULL per-cpu pointer", __LINE__));
for (i = 0, phw = pac->pc_ppcpmcs; i < ppc_max_pmcs; i++, phw++) {
phw->phw_state = PMC_PHW_FLAG_IS_ENABLED |
PMC_PHW_CPU_TO_STATE(cpu) | PMC_PHW_INDEX_TO_STATE(i);
phw->phw_pmc = NULL;
pc->pc_hwpmcs[i + first_ri] = phw;
}
return (0);
}
int
powerpc_pcpu_fini(struct pmc_mdep *md, int cpu)
{
PMCDBG1(MDP,INI,1,"powerpc-fini cpu=%d", cpu);
free(powerpc_pcpu[cpu]->pc_ppcpmcs, M_PMC);
free(powerpc_pcpu[cpu], M_PMC);
return (0);
}
int
powerpc_allocate_pmc(int cpu, int ri, struct pmc *pm,
const struct pmc_op_pmcallocate *a)
{
enum pmc_event pe;
uint32_t caps, config = 0, counter = 0;
int i;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[powerpc,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < ppc_max_pmcs,
("[powerpc,%d] illegal row index %d", __LINE__, ri));
caps = a->pm_caps;
pe = a->pm_ev;
if (pe < ppc_event_first || pe > ppc_event_last)
return (EINVAL);
for (i = 0; i < ppc_event_codes_size; i++) {
if (ppc_event_codes[i].pe_event == pe) {
config = ppc_event_codes[i].pe_code;
counter = ppc_event_codes[i].pe_flags;
break;
}
}
if (i == ppc_event_codes_size)
return (EINVAL);
if ((counter & (1 << ri)) == 0)
return (EINVAL);
if (caps & PMC_CAP_SYSTEM)
config |= POWERPC_PMC_KERNEL_ENABLE;
if (caps & PMC_CAP_USER)
config |= POWERPC_PMC_USER_ENABLE;
if ((caps & (PMC_CAP_USER | PMC_CAP_SYSTEM)) == 0)
config |= POWERPC_PMC_ENABLE;
pm->pm_md.pm_powerpc.pm_powerpc_evsel = config;
PMCDBG3(MDP,ALL,1,"powerpc-allocate cpu=%d ri=%d -> config=0x%x",
cpu, ri, config);
return (0);
}
int
powerpc_release_pmc(int cpu, int ri, struct pmc *pmc)
{
struct pmc_hw *phw;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[powerpc,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < ppc_max_pmcs,
("[powerpc,%d] illegal row-index %d", __LINE__, ri));
phw = &powerpc_pcpu[cpu]->pc_ppcpmcs[ri];
KASSERT(phw->phw_pmc == NULL,
("[powerpc,%d] PHW pmc %p non-NULL", __LINE__, phw->phw_pmc));
return (0);
}
int
powerpc_start_pmc(int cpu, int ri)
{
struct pmc *pm;
PMCDBG2(MDP,STA,1,"powerpc-start cpu=%d ri=%d", cpu, ri);
pm = powerpc_pcpu[cpu]->pc_ppcpmcs[ri].phw_pmc;
powerpc_set_pmc(cpu, ri, pm->pm_md.pm_powerpc.pm_powerpc_evsel);
return (0);
}
int
powerpc_stop_pmc(int cpu, int ri)
{
PMCDBG2(MDP,STO,1, "powerpc-stop cpu=%d ri=%d", cpu, ri);
powerpc_set_pmc(cpu, ri, PMCN_NONE);
return (0);
}
int
powerpc_config_pmc(int cpu, int ri, struct pmc *pm)
{
struct pmc_hw *phw;
PMCDBG3(MDP,CFG,1, "powerpc-config cpu=%d ri=%d pm=%p", cpu, ri, pm);
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[powerpc,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < ppc_max_pmcs,
("[powerpc,%d] illegal row-index %d", __LINE__, ri));
phw = &powerpc_pcpu[cpu]->pc_ppcpmcs[ri];
KASSERT(pm == NULL || phw->phw_pmc == NULL,
("[powerpc,%d] pm=%p phw->pm=%p hwpmc not unconfigured",
__LINE__, pm, phw->phw_pmc));
phw->phw_pmc = pm;
return (0);
}
pmc_value_t
powerpc_pmcn_read_default(unsigned int pmc)
{
pmc_value_t val;
if (pmc > ppc_max_pmcs)
panic("Invalid PMC number: %d\n", pmc);
switch (pmc) {
case 0:
val = mfspr(SPR_PMC1);
break;
case 1:
val = mfspr(SPR_PMC2);
break;
case 2:
val = mfspr(SPR_PMC3);
break;
case 3:
val = mfspr(SPR_PMC4);
break;
case 4:
val = mfspr(SPR_PMC5);
break;
case 5:
val = mfspr(SPR_PMC6);
break;
case 6:
val = mfspr(SPR_PMC7);
break;
case 7:
val = mfspr(SPR_PMC8);
break;
}
return (val);
}
void
powerpc_pmcn_write_default(unsigned int pmc, uint32_t val)
{
if (pmc > ppc_max_pmcs)
panic("Invalid PMC number: %d\n", pmc);
switch (pmc) {
case 0:
mtspr(SPR_PMC1, val);
break;
case 1:
mtspr(SPR_PMC2, val);
break;
case 2:
mtspr(SPR_PMC3, val);
break;
case 3:
mtspr(SPR_PMC4, val);
break;
case 4:
mtspr(SPR_PMC5, val);
break;
case 5:
mtspr(SPR_PMC6, val);
break;
case 6:
mtspr(SPR_PMC7, val);
break;
case 7:
mtspr(SPR_PMC8, val);
break;
}
}
int
powerpc_read_pmc(int cpu, int ri, pmc_value_t *v)
{
struct pmc *pm;
pmc_value_t p, r, tmp;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[powerpc,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < ppc_max_pmcs,
("[powerpc,%d] illegal row index %d", __LINE__, ri));
pm = powerpc_pcpu[cpu]->pc_ppcpmcs[ri].phw_pmc;
KASSERT(pm,
("[core,%d] cpu %d ri %d pmc not configured", __LINE__, cpu,
ri));
/*
* After an interrupt occurs because of a PMC overflow, the PMC value
* is not always MAX_PMC_VALUE + 1, but may be a little above it.
* This may mess up calculations and frustrate machine independent
* layer expectations, such as that no value read should be greater
* than reload count in sampling mode.
* To avoid these issues, use MAX_PMC_VALUE as an upper limit.
*/
p = MIN(powerpc_pmcn_read(ri), POWERPC_MAX_PMC_VALUE);
r = pm->pm_sc.pm_reloadcount;
if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) {
/*
* Special case 1: r is too big
* This usually happens when a PMC write fails, the PMC is
* stopped and then it is read.
*
* Special case 2: PMC was reseted or has a value
* that should not be possible with current r.
*
* In the above cases, just return 0 instead of an arbitrary
* value.
*/
if (r > POWERPC_MAX_PMC_VALUE || p + r <= POWERPC_MAX_PMC_VALUE)
tmp = 0;
else
tmp = POWERPC_PERFCTR_VALUE_TO_RELOAD_COUNT(p);
} else
tmp = p + (POWERPC_MAX_PMC_VALUE + 1) * PPC_OVERFLOWCNT(pm);
PMCDBG5(MDP,REA,1,"ppc-read cpu=%d ri=%d -> %jx (%jx,%jx)",
cpu, ri, (uintmax_t)tmp, (uintmax_t)PPC_OVERFLOWCNT(pm),
(uintmax_t)p);
*v = tmp;
return (0);
}
int
powerpc_write_pmc(int cpu, int ri, pmc_value_t v)
{
struct pmc *pm;
pmc_value_t vlo;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[powerpc,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < ppc_max_pmcs,
("[powerpc,%d] illegal row-index %d", __LINE__, ri));
pm = powerpc_pcpu[cpu]->pc_ppcpmcs[ri].phw_pmc;
if (PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm))) {
PPC_OVERFLOWCNT(pm) = v / (POWERPC_MAX_PMC_VALUE + 1);
vlo = v % (POWERPC_MAX_PMC_VALUE + 1);
} else if (v > POWERPC_MAX_PMC_VALUE) {
PMCDBG3(MDP,WRI,2,
"powerpc-write cpu=%d ri=%d: PMC value is too big: %jx",
cpu, ri, (uintmax_t)v);
return (EINVAL);
} else
vlo = POWERPC_RELOAD_COUNT_TO_PERFCTR_VALUE(v);
PMCDBG5(MDP,WRI,1,"powerpc-write cpu=%d ri=%d -> %jx (%jx,%jx)",
cpu, ri, (uintmax_t)v, (uintmax_t)PPC_OVERFLOWCNT(pm),
(uintmax_t)vlo);
powerpc_pmcn_write(ri, vlo);
return (0);
}
int
powerpc_pmc_intr(struct trapframe *tf)
{
struct pmc *pm;
struct powerpc_cpu *pc;
int cpu, error, i, retval;
cpu = curcpu;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[powerpc,%d] out of range CPU %d", __LINE__, cpu));
PMCDBG3(MDP,INT,1, "cpu=%d tf=%p um=%d", cpu, (void *) tf,
TRAPF_USERMODE(tf));
retval = 0;
pc = powerpc_pcpu[cpu];
/*
* Look for a running, sampling PMC which has overflowed
* and which has a valid 'struct pmc' association.
*/
for (i = 0; i < ppc_max_pmcs; i++) {
if (!POWERPC_PMC_HAS_OVERFLOWED(i))
continue;
retval = 1; /* Found an interrupting PMC. */
/*
* Always clear the PMC, to make it stop interrupting.
* If pm is available and in sampling mode, use reload
* count, to make PMC read after stop correct.
* Otherwise, just reset the PMC.
*/
if ((pm = pc->pc_ppcpmcs[i].phw_pmc) != NULL &&
PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) {
if (pm->pm_state != PMC_STATE_RUNNING) {
powerpc_write_pmc(cpu, i,
pm->pm_sc.pm_reloadcount);
continue;
}
} else {
if (pm != NULL) { /* !PMC_IS_SAMPLING_MODE */
PPC_OVERFLOWCNT(pm) = (PPC_OVERFLOWCNT(pm) +
1) % PPC_OVERFLOWCNT_MAX;
PMCDBG3(MDP,INT,2,
"cpu=%d ri=%d: overflowcnt=%d",
cpu, i, PPC_OVERFLOWCNT(pm));
}
powerpc_pmcn_write(i, 0);
continue;
}
error = pmc_process_interrupt(PMC_HR, pm, tf);
if (error != 0) {
PMCDBG3(MDP,INT,3,
"cpu=%d ri=%d: error %d processing interrupt",
cpu, i, error);
powerpc_stop_pmc(cpu, i);
}
/* Reload sampling count */
powerpc_write_pmc(cpu, i, pm->pm_sc.pm_reloadcount);
}
if (retval)
counter_u64_add(pmc_stats.pm_intr_processed, 1);
else
counter_u64_add(pmc_stats.pm_intr_ignored, 1);
/*
* Re-enable PERF exceptions if we were able to find the interrupt
* source and handle it. Otherwise, it's better to disable PERF
* interrupts, to avoid the risk of processing the same interrupt
* forever.
*/
powerpc_resume_pmc(retval != 0);
if (retval == 0)
log(LOG_WARNING,
"pmc_intr: couldn't find interrupting PMC on cpu %d - "
"disabling PERF interrupts\n", cpu);
return (retval);
}
struct pmc_mdep *
pmc_md_initialize()
{
struct pmc_mdep *pmc_mdep;
int error;
uint16_t vers;
/*
* Allocate space for pointers to PMC HW descriptors and for
* the MDEP structure used by MI code.
*/
powerpc_pcpu = malloc(sizeof(struct powerpc_cpu *) * pmc_cpu_max(), M_PMC,
M_WAITOK|M_ZERO);
/* Just one class */
pmc_mdep = pmc_mdep_alloc(1);
vers = mfpvr() >> 16;
pmc_mdep->pmd_switch_in = powerpc_switch_in;
pmc_mdep->pmd_switch_out = powerpc_switch_out;
switch (vers) {
case MPC7447A:
case MPC7448:
case MPC7450:
case MPC7455:
case MPC7457:
error = pmc_mpc7xxx_initialize(pmc_mdep);
break;
case IBM970:
case IBM970FX:
case IBM970MP:
error = pmc_ppc970_initialize(pmc_mdep);
break;
case IBMPOWER8E:
case IBMPOWER8NVL:
case IBMPOWER8:
case IBMPOWER9:
error = pmc_power8_initialize(pmc_mdep);
break;
case FSL_E500v1:
case FSL_E500v2:
case FSL_E500mc:
case FSL_E5500:
error = pmc_e500_initialize(pmc_mdep);
break;
default:
error = -1;
break;
}
if (error != 0) {
pmc_mdep_free(pmc_mdep);
pmc_mdep = NULL;
}
return (pmc_mdep);
}
void
pmc_md_finalize(struct pmc_mdep *md)
{
free(powerpc_pcpu, M_PMC);
powerpc_pcpu = NULL;
}
int
pmc_save_user_callchain(uintptr_t *cc, int maxsamples,
struct trapframe *tf)
{
uintptr_t *osp, *sp;
int frames = 0;
cc[frames++] = PMC_TRAPFRAME_TO_PC(tf);
sp = (uintptr_t *)PMC_TRAPFRAME_TO_FP(tf);
osp = NULL;
for (; frames < maxsamples; frames++) {
if (sp <= osp)
break;
osp = sp;
#ifdef __powerpc64__
/* Check if 32-bit mode. */
if (!(tf->srr1 & PSL_SF)) {
cc[frames] = fuword32((uint32_t *)sp + 1);
sp = (uintptr_t *)(uintptr_t)fuword32(sp);
} else {
cc[frames] = fuword(sp + 2);
sp = (uintptr_t *)fuword(sp);
}
#else
cc[frames] = fuword32((uint32_t *)sp + 1);
sp = (uintptr_t *)fuword32(sp);
#endif
}
return (frames);
}
