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freebsd-skq/sys/dev/hwpmc/hwpmc_core.c
kib 4387bf78c9 Add x86 msr tweak KPI. 
Use the KPI to tweak MSRs in mitigation code.

Reviewed by:	markj, scottl
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D22431
2019-11-18 20:53:57 +00:00

1348 lines
32 KiB
C
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2008 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.
*/
/*
* Intel Core PMCs.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/pmc.h>
#include <sys/pmckern.h>
#include <sys/smp.h>
#include <sys/systm.h>
#include <machine/intr_machdep.h>
#include <x86/apicvar.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/md_var.h>
#include <machine/specialreg.h>
#define CORE_CPUID_REQUEST 0xA
#define CORE_CPUID_REQUEST_SIZE 0x4
#define CORE_CPUID_EAX 0x0
#define CORE_CPUID_EBX 0x1
#define CORE_CPUID_ECX 0x2
#define CORE_CPUID_EDX 0x3
#define IAF_PMC_CAPS \
(PMC_CAP_READ | PMC_CAP_WRITE | PMC_CAP_INTERRUPT | \
PMC_CAP_USER | PMC_CAP_SYSTEM)
#define IAF_RI_TO_MSR(RI) ((RI) + (1 << 30))
#define IAP_PMC_CAPS (PMC_CAP_INTERRUPT | PMC_CAP_USER | PMC_CAP_SYSTEM | \
PMC_CAP_EDGE | PMC_CAP_THRESHOLD | PMC_CAP_READ | PMC_CAP_WRITE | \
PMC_CAP_INVERT | PMC_CAP_QUALIFIER | PMC_CAP_PRECISE)
#define EV_IS_NOTARCH 0
#define EV_IS_ARCH_SUPP 1
#define EV_IS_ARCH_NOTSUPP -1
/*
* "Architectural" events defined by Intel. The values of these
* symbols correspond to positions in the bitmask returned by
* the CPUID.0AH instruction.
*/
enum core_arch_events {
CORE_AE_BRANCH_INSTRUCTION_RETIRED = 5,
CORE_AE_BRANCH_MISSES_RETIRED = 6,
CORE_AE_INSTRUCTION_RETIRED = 1,
CORE_AE_LLC_MISSES = 4,
CORE_AE_LLC_REFERENCE = 3,
CORE_AE_UNHALTED_REFERENCE_CYCLES = 2,
CORE_AE_UNHALTED_CORE_CYCLES = 0
};
static enum pmc_cputype core_cputype;
struct core_cpu {
volatile uint32_t pc_resync;
volatile uint32_t pc_iafctrl; /* Fixed function control. */
volatile uint64_t pc_globalctrl; /* Global control register. */
struct pmc_hw pc_corepmcs[];
};
static struct core_cpu **core_pcpu;
static uint32_t core_architectural_events;
static uint64_t core_pmcmask;
static int core_iaf_ri; /* relative index of fixed counters */
static int core_iaf_width;
static int core_iaf_npmc;
static int core_iap_width;
static int core_iap_npmc;
static int core_iap_wroffset;
static u_int pmc_alloc_refs;
static bool pmc_tsx_force_abort_set;
static int
core_pcpu_noop(struct pmc_mdep *md, int cpu)
{
(void) md;
(void) cpu;
return (0);
}
static int
core_pcpu_init(struct pmc_mdep *md, int cpu)
{
struct pmc_cpu *pc;
struct core_cpu *cc;
struct pmc_hw *phw;
int core_ri, n, npmc;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[iaf,%d] insane cpu number %d", __LINE__, cpu));
PMCDBG1(MDP,INI,1,"core-init cpu=%d", cpu);
core_ri = md->pmd_classdep[PMC_MDEP_CLASS_INDEX_IAP].pcd_ri;
npmc = md->pmd_classdep[PMC_MDEP_CLASS_INDEX_IAP].pcd_num;
if (core_cputype != PMC_CPU_INTEL_CORE)
npmc += md->pmd_classdep[PMC_MDEP_CLASS_INDEX_IAF].pcd_num;
cc = malloc(sizeof(struct core_cpu) + npmc * sizeof(struct pmc_hw),
M_PMC, M_WAITOK | M_ZERO);
core_pcpu[cpu] = cc;
pc = pmc_pcpu[cpu];
KASSERT(pc != NULL && cc != NULL,
("[core,%d] NULL per-cpu structures cpu=%d", __LINE__, cpu));
for (n = 0, phw = cc->pc_corepmcs; n < npmc; n++, phw++) {
phw->phw_state = PMC_PHW_FLAG_IS_ENABLED |
PMC_PHW_CPU_TO_STATE(cpu) |
PMC_PHW_INDEX_TO_STATE(n + core_ri);
phw->phw_pmc = NULL;
pc->pc_hwpmcs[n + core_ri] = phw;
}
return (0);
}
static int
core_pcpu_fini(struct pmc_mdep *md, int cpu)
{
int core_ri, n, npmc;
struct pmc_cpu *pc;
struct core_cpu *cc;
uint64_t msr = 0;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] insane cpu number (%d)", __LINE__, cpu));
PMCDBG1(MDP,INI,1,"core-pcpu-fini cpu=%d", cpu);
if ((cc = core_pcpu[cpu]) == NULL)
return (0);
core_pcpu[cpu] = NULL;
pc = pmc_pcpu[cpu];
KASSERT(pc != NULL, ("[core,%d] NULL per-cpu %d state", __LINE__,
cpu));
npmc = md->pmd_classdep[PMC_MDEP_CLASS_INDEX_IAP].pcd_num;
core_ri = md->pmd_classdep[PMC_MDEP_CLASS_INDEX_IAP].pcd_ri;
for (n = 0; n < npmc; n++) {
msr = rdmsr(IAP_EVSEL0 + n) & ~IAP_EVSEL_MASK;
wrmsr(IAP_EVSEL0 + n, msr);
}
if (core_cputype != PMC_CPU_INTEL_CORE) {
msr = rdmsr(IAF_CTRL) & ~IAF_CTRL_MASK;
wrmsr(IAF_CTRL, msr);
npmc += md->pmd_classdep[PMC_MDEP_CLASS_INDEX_IAF].pcd_num;
}
for (n = 0; n < npmc; n++)
pc->pc_hwpmcs[n + core_ri] = NULL;
free(cc, M_PMC);
return (0);
}
/*
* Fixed function counters.
*/
static pmc_value_t
iaf_perfctr_value_to_reload_count(pmc_value_t v)
{
/* If the PMC has overflowed, return a reload count of zero. */
if ((v & (1ULL << (core_iaf_width - 1))) == 0)
return (0);
v &= (1ULL << core_iaf_width) - 1;
return (1ULL << core_iaf_width) - v;
}
static pmc_value_t
iaf_reload_count_to_perfctr_value(pmc_value_t rlc)
{
return (1ULL << core_iaf_width) - rlc;
}
static int
iaf_allocate_pmc(int cpu, int ri, struct pmc *pm,
const struct pmc_op_pmcallocate *a)
{
uint8_t ev, umask;
uint32_t caps, flags, config;
const struct pmc_md_iap_op_pmcallocate *iap;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal CPU %d", __LINE__, cpu));
PMCDBG2(MDP,ALL,1, "iaf-allocate ri=%d reqcaps=0x%x", ri, pm->pm_caps);
if (ri < 0 || ri > core_iaf_npmc)
return (EINVAL);
caps = a->pm_caps;
if (a->pm_class != PMC_CLASS_IAF ||
(caps & IAF_PMC_CAPS) != caps)
return (EINVAL);
iap = &a->pm_md.pm_iap;
config = iap->pm_iap_config;
ev = IAP_EVSEL_GET(config);
umask = IAP_UMASK_GET(config);
/* INST_RETIRED.ANY */
if (ev == 0xC0 && ri != 0)
return (EINVAL);
/* CPU_CLK_UNHALTED.THREAD */
if (ev == 0x3C && ri != 1)
return (EINVAL);
/* CPU_CLK_UNHALTED.REF */
if (ev == 0x0 && umask == 0x3 && ri != 2)
return (EINVAL);
pmc_alloc_refs++;
if ((cpu_stdext_feature3 & CPUID_STDEXT3_TSXFA) != 0 &&
!pmc_tsx_force_abort_set) {
pmc_tsx_force_abort_set = true;
x86_msr_op(MSR_TSX_FORCE_ABORT, MSR_OP_RENDEZVOUS |
MSR_OP_WRITE, 1);
}
flags = 0;
if (config & IAP_OS)
flags |= IAF_OS;
if (config & IAP_USR)
flags |= IAF_USR;
if (config & IAP_ANY)
flags |= IAF_ANY;
if (config & IAP_INT)
flags |= IAF_PMI;
if (caps & PMC_CAP_INTERRUPT)
flags |= IAF_PMI;
if (caps & PMC_CAP_SYSTEM)
flags |= IAF_OS;
if (caps & PMC_CAP_USER)
flags |= IAF_USR;
if ((caps & (PMC_CAP_USER | PMC_CAP_SYSTEM)) == 0)
flags |= (IAF_OS | IAF_USR);
pm->pm_md.pm_iaf.pm_iaf_ctrl = (flags << (ri * 4));
PMCDBG1(MDP,ALL,2, "iaf-allocate config=0x%jx",
(uintmax_t) pm->pm_md.pm_iaf.pm_iaf_ctrl);
return (0);
}
static int
iaf_config_pmc(int cpu, int ri, struct pmc *pm)
{
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal CPU %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iaf_npmc,
("[core,%d] illegal row-index %d", __LINE__, ri));
PMCDBG3(MDP,CFG,1, "iaf-config cpu=%d ri=%d pm=%p", cpu, ri, pm);
KASSERT(core_pcpu[cpu] != NULL, ("[core,%d] null per-cpu %d", __LINE__,
cpu));
core_pcpu[cpu]->pc_corepmcs[ri + core_iaf_ri].phw_pmc = pm;
return (0);
}
static int
iaf_describe(int cpu, int ri, struct pmc_info *pi, struct pmc **ppmc)
{
int error;
struct pmc_hw *phw;
char iaf_name[PMC_NAME_MAX];
phw = &core_pcpu[cpu]->pc_corepmcs[ri + core_iaf_ri];
(void) snprintf(iaf_name, sizeof(iaf_name), "IAF-%d", ri);
if ((error = copystr(iaf_name, pi->pm_name, PMC_NAME_MAX,
NULL)) != 0)
return (error);
pi->pm_class = PMC_CLASS_IAF;
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
iaf_get_config(int cpu, int ri, struct pmc **ppm)
{
*ppm = core_pcpu[cpu]->pc_corepmcs[ri + core_iaf_ri].phw_pmc;
return (0);
}
static int
iaf_get_msr(int ri, uint32_t *msr)
{
KASSERT(ri >= 0 && ri < core_iaf_npmc,
("[iaf,%d] ri %d out of range", __LINE__, ri));
*msr = IAF_RI_TO_MSR(ri);
return (0);
}
static int
iaf_read_pmc(int cpu, int ri, pmc_value_t *v)
{
struct pmc *pm;
pmc_value_t tmp;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal cpu value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iaf_npmc,
("[core,%d] illegal row-index %d", __LINE__, ri));
pm = core_pcpu[cpu]->pc_corepmcs[ri + core_iaf_ri].phw_pmc;
KASSERT(pm,
("[core,%d] cpu %d ri %d(%d) pmc not configured", __LINE__, cpu,
ri, ri + core_iaf_ri));
tmp = rdpmc(IAF_RI_TO_MSR(ri));
if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
*v = iaf_perfctr_value_to_reload_count(tmp);
else
*v = tmp & ((1ULL << core_iaf_width) - 1);
PMCDBG4(MDP,REA,1, "iaf-read cpu=%d ri=%d msr=0x%x -> v=%jx", cpu, ri,
IAF_RI_TO_MSR(ri), *v);
return (0);
}
static int
iaf_release_pmc(int cpu, int ri, struct pmc *pmc)
{
PMCDBG3(MDP,REL,1, "iaf-release cpu=%d ri=%d pm=%p", cpu, ri, pmc);
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iaf_npmc,
("[core,%d] illegal row-index %d", __LINE__, ri));
KASSERT(core_pcpu[cpu]->pc_corepmcs[ri + core_iaf_ri].phw_pmc == NULL,
("[core,%d] PHW pmc non-NULL", __LINE__));
MPASS(pmc_alloc_refs > 0);
if (pmc_alloc_refs-- == 1 && pmc_tsx_force_abort_set) {
pmc_tsx_force_abort_set = false;
x86_msr_op(MSR_TSX_FORCE_ABORT, MSR_OP_RENDEZVOUS |
MSR_OP_WRITE, 0);
}
return (0);
}
static int
iaf_start_pmc(int cpu, int ri)
{
struct pmc *pm;
struct core_cpu *iafc;
uint64_t msr = 0;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iaf_npmc,
("[core,%d] illegal row-index %d", __LINE__, ri));
PMCDBG2(MDP,STA,1,"iaf-start cpu=%d ri=%d", cpu, ri);
iafc = core_pcpu[cpu];
pm = iafc->pc_corepmcs[ri + core_iaf_ri].phw_pmc;
iafc->pc_iafctrl |= pm->pm_md.pm_iaf.pm_iaf_ctrl;
msr = rdmsr(IAF_CTRL) & ~IAF_CTRL_MASK;
wrmsr(IAF_CTRL, msr | (iafc->pc_iafctrl & IAF_CTRL_MASK));
do {
iafc->pc_resync = 0;
iafc->pc_globalctrl |= (1ULL << (ri + IAF_OFFSET));
msr = rdmsr(IA_GLOBAL_CTRL) & ~IAF_GLOBAL_CTRL_MASK;
wrmsr(IA_GLOBAL_CTRL, msr | (iafc->pc_globalctrl &
IAF_GLOBAL_CTRL_MASK));
} while (iafc->pc_resync != 0);
PMCDBG4(MDP,STA,1,"iafctrl=%x(%x) globalctrl=%jx(%jx)",
iafc->pc_iafctrl, (uint32_t) rdmsr(IAF_CTRL),
iafc->pc_globalctrl, rdmsr(IA_GLOBAL_CTRL));
return (0);
}
static int
iaf_stop_pmc(int cpu, int ri)
{
uint32_t fc;
struct core_cpu *iafc;
uint64_t msr = 0;
PMCDBG2(MDP,STO,1,"iaf-stop cpu=%d ri=%d", cpu, ri);
iafc = core_pcpu[cpu];
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iaf_npmc,
("[core,%d] illegal row-index %d", __LINE__, ri));
fc = (IAF_MASK << (ri * 4));
iafc->pc_iafctrl &= ~fc;
PMCDBG1(MDP,STO,1,"iaf-stop iafctrl=%x", iafc->pc_iafctrl);
msr = rdmsr(IAF_CTRL) & ~IAF_CTRL_MASK;
wrmsr(IAF_CTRL, msr | (iafc->pc_iafctrl & IAF_CTRL_MASK));
do {
iafc->pc_resync = 0;
iafc->pc_globalctrl &= ~(1ULL << (ri + IAF_OFFSET));
msr = rdmsr(IA_GLOBAL_CTRL) & ~IAF_GLOBAL_CTRL_MASK;
wrmsr(IA_GLOBAL_CTRL, msr | (iafc->pc_globalctrl &
IAF_GLOBAL_CTRL_MASK));
} while (iafc->pc_resync != 0);
PMCDBG4(MDP,STO,1,"iafctrl=%x(%x) globalctrl=%jx(%jx)",
iafc->pc_iafctrl, (uint32_t) rdmsr(IAF_CTRL),
iafc->pc_globalctrl, rdmsr(IA_GLOBAL_CTRL));
return (0);
}
static int
iaf_write_pmc(int cpu, int ri, pmc_value_t v)
{
struct core_cpu *cc;
struct pmc *pm;
uint64_t msr;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal cpu value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iaf_npmc,
("[core,%d] illegal row-index %d", __LINE__, ri));
cc = core_pcpu[cpu];
pm = cc->pc_corepmcs[ri + core_iaf_ri].phw_pmc;
KASSERT(pm,
("[core,%d] cpu %d ri %d pmc not configured", __LINE__, cpu, ri));
if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
v = iaf_reload_count_to_perfctr_value(v);
/* Turn off fixed counters */
msr = rdmsr(IAF_CTRL) & ~IAF_CTRL_MASK;
wrmsr(IAF_CTRL, msr);
wrmsr(IAF_CTR0 + ri, v & ((1ULL << core_iaf_width) - 1));
/* Turn on fixed counters */
msr = rdmsr(IAF_CTRL) & ~IAF_CTRL_MASK;
wrmsr(IAF_CTRL, msr | (cc->pc_iafctrl & IAF_CTRL_MASK));
PMCDBG6(MDP,WRI,1, "iaf-write cpu=%d ri=%d msr=0x%x v=%jx iafctrl=%jx "
"pmc=%jx", cpu, ri, IAF_RI_TO_MSR(ri), v,
(uintmax_t) rdmsr(IAF_CTRL),
(uintmax_t) rdpmc(IAF_RI_TO_MSR(ri)));
return (0);
}
static void
iaf_initialize(struct pmc_mdep *md, int maxcpu, int npmc, int pmcwidth)
{
struct pmc_classdep *pcd;
KASSERT(md != NULL, ("[iaf,%d] md is NULL", __LINE__));
PMCDBG0(MDP,INI,1, "iaf-initialize");
pcd = &md->pmd_classdep[PMC_MDEP_CLASS_INDEX_IAF];
pcd->pcd_caps = IAF_PMC_CAPS;
pcd->pcd_class = PMC_CLASS_IAF;
pcd->pcd_num = npmc;
pcd->pcd_ri = md->pmd_npmc;
pcd->pcd_width = pmcwidth;
pcd->pcd_allocate_pmc = iaf_allocate_pmc;
pcd->pcd_config_pmc = iaf_config_pmc;
pcd->pcd_describe = iaf_describe;
pcd->pcd_get_config = iaf_get_config;
pcd->pcd_get_msr = iaf_get_msr;
pcd->pcd_pcpu_fini = core_pcpu_noop;
pcd->pcd_pcpu_init = core_pcpu_noop;
pcd->pcd_read_pmc = iaf_read_pmc;
pcd->pcd_release_pmc = iaf_release_pmc;
pcd->pcd_start_pmc = iaf_start_pmc;
pcd->pcd_stop_pmc = iaf_stop_pmc;
pcd->pcd_write_pmc = iaf_write_pmc;
md->pmd_npmc += npmc;
}
/*
* Intel programmable PMCs.
*/
/* Sub fields of UMASK that this event supports. */
#define IAP_M_CORE (1 << 0) /* Core specificity */
#define IAP_M_AGENT (1 << 1) /* Agent specificity */
#define IAP_M_PREFETCH (1 << 2) /* Prefetch */
#define IAP_M_MESI (1 << 3) /* MESI */
#define IAP_M_SNOOPRESPONSE (1 << 4) /* Snoop response */
#define IAP_M_SNOOPTYPE (1 << 5) /* Snoop type */
#define IAP_M_TRANSITION (1 << 6) /* Transition */
#define IAP_F_CORE (0x3 << 14) /* Core specificity */
#define IAP_F_AGENT (0x1 << 13) /* Agent specificity */
#define IAP_F_PREFETCH (0x3 << 12) /* Prefetch */
#define IAP_F_MESI (0xF << 8) /* MESI */
#define IAP_F_SNOOPRESPONSE (0xB << 8) /* Snoop response */
#define IAP_F_SNOOPTYPE (0x3 << 8) /* Snoop type */
#define IAP_F_TRANSITION (0x1 << 12) /* Transition */
#define IAP_PREFETCH_RESERVED (0x2 << 12)
#define IAP_CORE_THIS (0x1 << 14)
#define IAP_CORE_ALL (0x3 << 14)
#define IAP_F_CMASK 0xFF000000
static pmc_value_t
iap_perfctr_value_to_reload_count(pmc_value_t v)
{
/* If the PMC has overflowed, return a reload count of zero. */
if ((v & (1ULL << (core_iap_width - 1))) == 0)
return (0);
v &= (1ULL << core_iap_width) - 1;
return (1ULL << core_iap_width) - v;
}
static pmc_value_t
iap_reload_count_to_perfctr_value(pmc_value_t rlc)
{
return (1ULL << core_iap_width) - rlc;
}
static int
iap_pmc_has_overflowed(int ri)
{
uint64_t v;
/*
* We treat a Core (i.e., Intel architecture v1) PMC as has
* having overflowed if its MSB is zero.
*/
v = rdpmc(ri);
return ((v & (1ULL << (core_iap_width - 1))) == 0);
}
static int
iap_event_corei7_ok_on_counter(uint8_t evsel, int ri)
{
uint32_t mask;
switch (evsel) {
/*
* Events valid only on counter 0, 1.
*/
case 0x40:
case 0x41:
case 0x42:
case 0x43:
case 0x51:
case 0x63:
mask = 0x3;
break;
default:
mask = ~0; /* Any row index is ok. */
}
return (mask & (1 << ri));
}
static int
iap_event_westmere_ok_on_counter(uint8_t evsel, int ri)
{
uint32_t mask;
switch (evsel) {
/*
* Events valid only on counter 0.
*/
case 0x60:
case 0xB3:
mask = 0x1;
break;
/*
* Events valid only on counter 0, 1.
*/
case 0x4C:
case 0x4E:
case 0x51:
case 0x63:
mask = 0x3;
break;
default:
mask = ~0; /* Any row index is ok. */
}
return (mask & (1 << ri));
}
static int
iap_event_sb_sbx_ib_ibx_ok_on_counter(uint8_t evsel, int ri)
{
uint32_t mask;
switch (evsel) {
/* Events valid only on counter 0. */
case 0xB7:
mask = 0x1;
break;
/* Events valid only on counter 1. */
case 0xC0:
mask = 0x2;
break;
/* Events valid only on counter 2. */
case 0x48:
case 0xA2:
case 0xA3:
mask = 0x4;
break;
/* Events valid only on counter 3. */
case 0xBB:
case 0xCD:
mask = 0x8;
break;
default:
mask = ~0; /* Any row index is ok. */
}
return (mask & (1 << ri));
}
static int
iap_event_ok_on_counter(uint8_t evsel, int ri)
{
uint32_t mask;
switch (evsel) {
/*
* Events valid only on counter 0.
*/
case 0x10:
case 0x14:
case 0x18:
case 0xB3:
case 0xC1:
case 0xCB:
mask = (1 << 0);
break;
/*
* Events valid only on counter 1.
*/
case 0x11:
case 0x12:
case 0x13:
mask = (1 << 1);
break;
default:
mask = ~0; /* Any row index is ok. */
}
return (mask & (1 << ri));
}
static int
iap_allocate_pmc(int cpu, int ri, struct pmc *pm,
const struct pmc_op_pmcallocate *a)
{
enum pmc_event map;
uint8_t ev;
uint32_t caps;
const struct pmc_md_iap_op_pmcallocate *iap;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal CPU %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iap_npmc,
("[core,%d] illegal row-index value %d", __LINE__, ri));
/* check requested capabilities */
caps = a->pm_caps;
if ((IAP_PMC_CAPS & caps) != caps)
return (EPERM);
map = 0; /* XXX: silent GCC warning */
iap = &a->pm_md.pm_iap;
ev = IAP_EVSEL_GET(iap->pm_iap_config);
switch (core_cputype) {
case PMC_CPU_INTEL_COREI7:
case PMC_CPU_INTEL_NEHALEM_EX:
if (iap_event_corei7_ok_on_counter(ev, ri) == 0)
return (EINVAL);
break;
case PMC_CPU_INTEL_SKYLAKE:
case PMC_CPU_INTEL_SKYLAKE_XEON:
case PMC_CPU_INTEL_BROADWELL:
case PMC_CPU_INTEL_BROADWELL_XEON:
case PMC_CPU_INTEL_SANDYBRIDGE:
case PMC_CPU_INTEL_SANDYBRIDGE_XEON:
case PMC_CPU_INTEL_IVYBRIDGE:
case PMC_CPU_INTEL_IVYBRIDGE_XEON:
case PMC_CPU_INTEL_HASWELL:
case PMC_CPU_INTEL_HASWELL_XEON:
if (iap_event_sb_sbx_ib_ibx_ok_on_counter(ev, ri) == 0)
return (EINVAL);
break;
case PMC_CPU_INTEL_WESTMERE:
case PMC_CPU_INTEL_WESTMERE_EX:
if (iap_event_westmere_ok_on_counter(ev, ri) == 0)
return (EINVAL);
break;
default:
if (iap_event_ok_on_counter(ev, ri) == 0)
return (EINVAL);
}
pm->pm_md.pm_iap.pm_iap_evsel = iap->pm_iap_config;
return (0);
}
static int
iap_config_pmc(int cpu, int ri, struct pmc *pm)
{
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal CPU %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iap_npmc,
("[core,%d] illegal row-index %d", __LINE__, ri));
PMCDBG3(MDP,CFG,1, "iap-config cpu=%d ri=%d pm=%p", cpu, ri, pm);
KASSERT(core_pcpu[cpu] != NULL, ("[core,%d] null per-cpu %d", __LINE__,
cpu));
core_pcpu[cpu]->pc_corepmcs[ri].phw_pmc = pm;
return (0);
}
static int
iap_describe(int cpu, int ri, struct pmc_info *pi, struct pmc **ppmc)
{
int error;
struct pmc_hw *phw;
char iap_name[PMC_NAME_MAX];
phw = &core_pcpu[cpu]->pc_corepmcs[ri];
(void) snprintf(iap_name, sizeof(iap_name), "IAP-%d", ri);
if ((error = copystr(iap_name, pi->pm_name, PMC_NAME_MAX,
NULL)) != 0)
return (error);
pi->pm_class = PMC_CLASS_IAP;
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
iap_get_config(int cpu, int ri, struct pmc **ppm)
{
*ppm = core_pcpu[cpu]->pc_corepmcs[ri].phw_pmc;
return (0);
}
static int
iap_get_msr(int ri, uint32_t *msr)
{
KASSERT(ri >= 0 && ri < core_iap_npmc,
("[iap,%d] ri %d out of range", __LINE__, ri));
*msr = ri;
return (0);
}
static int
iap_read_pmc(int cpu, int ri, pmc_value_t *v)
{
struct pmc *pm;
pmc_value_t tmp;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal cpu value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iap_npmc,
("[core,%d] illegal row-index %d", __LINE__, ri));
pm = core_pcpu[cpu]->pc_corepmcs[ri].phw_pmc;
KASSERT(pm,
("[core,%d] cpu %d ri %d pmc not configured", __LINE__, cpu,
ri));
tmp = rdpmc(ri);
if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
*v = iap_perfctr_value_to_reload_count(tmp);
else
*v = tmp & ((1ULL << core_iap_width) - 1);
PMCDBG4(MDP,REA,1, "iap-read cpu=%d ri=%d msr=0x%x -> v=%jx", cpu, ri,
IAP_PMC0 + ri, *v);
return (0);
}
static int
iap_release_pmc(int cpu, int ri, struct pmc *pm)
{
(void) pm;
PMCDBG3(MDP,REL,1, "iap-release cpu=%d ri=%d pm=%p", cpu, ri,
pm);
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iap_npmc,
("[core,%d] illegal row-index %d", __LINE__, ri));
KASSERT(core_pcpu[cpu]->pc_corepmcs[ri].phw_pmc
== NULL, ("[core,%d] PHW pmc non-NULL", __LINE__));
return (0);
}
static int
iap_start_pmc(int cpu, int ri)
{
struct pmc *pm;
uint32_t evsel;
struct core_cpu *cc;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal CPU value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iap_npmc,
("[core,%d] illegal row-index %d", __LINE__, ri));
cc = core_pcpu[cpu];
pm = cc->pc_corepmcs[ri].phw_pmc;
KASSERT(pm,
("[core,%d] starting cpu%d,ri%d with no pmc configured",
__LINE__, cpu, ri));
PMCDBG2(MDP,STA,1, "iap-start cpu=%d ri=%d", cpu, ri);
evsel = pm->pm_md.pm_iap.pm_iap_evsel;
PMCDBG4(MDP,STA,2, "iap-start/2 cpu=%d ri=%d evselmsr=0x%x evsel=0x%x",
cpu, ri, IAP_EVSEL0 + ri, evsel);
/* Event specific configuration. */
switch (IAP_EVSEL_GET(evsel)) {
case 0xB7:
wrmsr(IA_OFFCORE_RSP0, pm->pm_md.pm_iap.pm_iap_rsp);
break;
case 0xBB:
wrmsr(IA_OFFCORE_RSP1, pm->pm_md.pm_iap.pm_iap_rsp);
break;
default:
break;
}
wrmsr(IAP_EVSEL0 + ri, evsel | IAP_EN);
if (core_cputype == PMC_CPU_INTEL_CORE)
return (0);
do {
cc->pc_resync = 0;
cc->pc_globalctrl |= (1ULL << ri);
wrmsr(IA_GLOBAL_CTRL, cc->pc_globalctrl);
} while (cc->pc_resync != 0);
return (0);
}
static int
iap_stop_pmc(int cpu, int ri)
{
struct pmc *pm;
struct core_cpu *cc;
uint64_t msr;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal cpu value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iap_npmc,
("[core,%d] illegal row index %d", __LINE__, ri));
cc = core_pcpu[cpu];
pm = cc->pc_corepmcs[ri].phw_pmc;
KASSERT(pm,
("[core,%d] cpu%d ri%d no configured PMC to stop", __LINE__,
cpu, ri));
PMCDBG2(MDP,STO,1, "iap-stop cpu=%d ri=%d", cpu, ri);
msr = rdmsr(IAP_EVSEL0 + ri) & ~IAP_EVSEL_MASK;
wrmsr(IAP_EVSEL0 + ri, msr); /* stop hw */
if (core_cputype == PMC_CPU_INTEL_CORE)
return (0);
msr = 0;
do {
cc->pc_resync = 0;
cc->pc_globalctrl &= ~(1ULL << ri);
msr = rdmsr(IA_GLOBAL_CTRL) & ~IA_GLOBAL_CTRL_MASK;
wrmsr(IA_GLOBAL_CTRL, cc->pc_globalctrl);
} while (cc->pc_resync != 0);
return (0);
}
static int
iap_write_pmc(int cpu, int ri, pmc_value_t v)
{
struct pmc *pm;
struct core_cpu *cc;
KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
("[core,%d] illegal cpu value %d", __LINE__, cpu));
KASSERT(ri >= 0 && ri < core_iap_npmc,
("[core,%d] illegal row index %d", __LINE__, ri));
cc = core_pcpu[cpu];
pm = cc->pc_corepmcs[ri].phw_pmc;
KASSERT(pm,
("[core,%d] cpu%d ri%d no configured PMC to stop", __LINE__,
cpu, ri));
if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
v = iap_reload_count_to_perfctr_value(v);
v &= (1ULL << core_iap_width) - 1;
PMCDBG4(MDP,WRI,1, "iap-write cpu=%d ri=%d msr=0x%x v=%jx", cpu, ri,
IAP_PMC0 + ri, v);
/*
* Write the new value to the counter (or it's alias). The
* counter will be in a stopped state when the pcd_write()
* entry point is called.
*/
wrmsr(core_iap_wroffset + IAP_PMC0 + ri, v);
return (0);
}
static void
iap_initialize(struct pmc_mdep *md, int maxcpu, int npmc, int pmcwidth,
int flags)
{
struct pmc_classdep *pcd;
KASSERT(md != NULL, ("[iap,%d] md is NULL", __LINE__));
PMCDBG0(MDP,INI,1, "iap-initialize");
/* Remember the set of architectural events supported. */
core_architectural_events = ~flags;
pcd = &md->pmd_classdep[PMC_MDEP_CLASS_INDEX_IAP];
pcd->pcd_caps = IAP_PMC_CAPS;
pcd->pcd_class = PMC_CLASS_IAP;
pcd->pcd_num = npmc;
pcd->pcd_ri = md->pmd_npmc;
pcd->pcd_width = pmcwidth;
pcd->pcd_allocate_pmc = iap_allocate_pmc;
pcd->pcd_config_pmc = iap_config_pmc;
pcd->pcd_describe = iap_describe;
pcd->pcd_get_config = iap_get_config;
pcd->pcd_get_msr = iap_get_msr;
pcd->pcd_pcpu_fini = core_pcpu_fini;
pcd->pcd_pcpu_init = core_pcpu_init;
pcd->pcd_read_pmc = iap_read_pmc;
pcd->pcd_release_pmc = iap_release_pmc;
pcd->pcd_start_pmc = iap_start_pmc;
pcd->pcd_stop_pmc = iap_stop_pmc;
pcd->pcd_write_pmc = iap_write_pmc;
md->pmd_npmc += npmc;
}
static int
core_intr(struct trapframe *tf)
{
pmc_value_t v;
struct pmc *pm;
struct core_cpu *cc;
int error, found_interrupt, ri;
uint64_t msr;
PMCDBG3(MDP,INT, 1, "cpu=%d tf=0x%p um=%d", curcpu, (void *) tf,
TRAPF_USERMODE(tf));
found_interrupt = 0;
cc = core_pcpu[curcpu];
for (ri = 0; ri < core_iap_npmc; ri++) {
if ((pm = cc->pc_corepmcs[ri].phw_pmc) == NULL ||
!PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
continue;
if (!iap_pmc_has_overflowed(ri))
continue;
found_interrupt = 1;
if (pm->pm_state != PMC_STATE_RUNNING)
continue;
error = pmc_process_interrupt(PMC_HR, pm, tf);
v = pm->pm_sc.pm_reloadcount;
v = iap_reload_count_to_perfctr_value(v);
/*
* Stop the counter, reload it but only restart it if
* the PMC is not stalled.
*/
msr = rdmsr(IAP_EVSEL0 + ri) & ~IAP_EVSEL_MASK;
wrmsr(IAP_EVSEL0 + ri, msr);
wrmsr(core_iap_wroffset + IAP_PMC0 + ri, v);
if (error)
continue;
wrmsr(IAP_EVSEL0 + ri, msr | (pm->pm_md.pm_iap.pm_iap_evsel |
IAP_EN));
}
if (found_interrupt)
lapic_reenable_pmc();
if (found_interrupt)
counter_u64_add(pmc_stats.pm_intr_processed, 1);
else
counter_u64_add(pmc_stats.pm_intr_ignored, 1);
return (found_interrupt);
}
static int
core2_intr(struct trapframe *tf)
{
int error, found_interrupt, n, cpu;
uint64_t flag, intrstatus, intrenable, msr;
struct pmc *pm;
struct core_cpu *cc;
pmc_value_t v;
cpu = curcpu;
PMCDBG3(MDP,INT, 1, "cpu=%d tf=0x%p um=%d", cpu, (void *) tf,
TRAPF_USERMODE(tf));
/*
* The IA_GLOBAL_STATUS (MSR 0x38E) register indicates which
* PMCs have a pending PMI interrupt. We take a 'snapshot' of
* the current set of interrupting PMCs and process these
* after stopping them.
*/
intrstatus = rdmsr(IA_GLOBAL_STATUS);
intrenable = intrstatus & core_pmcmask;
PMCDBG2(MDP,INT, 1, "cpu=%d intrstatus=%jx", cpu,
(uintmax_t) intrstatus);
found_interrupt = 0;
cc = core_pcpu[cpu];
KASSERT(cc != NULL, ("[core,%d] null pcpu", __LINE__));
cc->pc_globalctrl &= ~intrenable;
cc->pc_resync = 1; /* MSRs now potentially out of sync. */
/*
* Stop PMCs and clear overflow status bits.
*/
msr = rdmsr(IA_GLOBAL_CTRL) & ~IA_GLOBAL_CTRL_MASK;
wrmsr(IA_GLOBAL_CTRL, msr);
wrmsr(IA_GLOBAL_OVF_CTRL, intrenable |
IA_GLOBAL_STATUS_FLAG_OVFBUF |
IA_GLOBAL_STATUS_FLAG_CONDCHG);
/*
* Look for interrupts from fixed function PMCs.
*/
for (n = 0, flag = (1ULL << IAF_OFFSET); n < core_iaf_npmc;
n++, flag <<= 1) {
if ((intrstatus & flag) == 0)
continue;
found_interrupt = 1;
pm = cc->pc_corepmcs[n + core_iaf_ri].phw_pmc;
if (pm == NULL || pm->pm_state != PMC_STATE_RUNNING ||
!PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
continue;
error = pmc_process_interrupt(PMC_HR, pm, tf);
if (error)
intrenable &= ~flag;
v = iaf_reload_count_to_perfctr_value(pm->pm_sc.pm_reloadcount);
/* Reload sampling count. */
wrmsr(IAF_CTR0 + n, v);
PMCDBG4(MDP,INT, 1, "iaf-intr cpu=%d error=%d v=%jx(%jx)", curcpu,
error, (uintmax_t) v, (uintmax_t) rdpmc(IAF_RI_TO_MSR(n)));
}
/*
* Process interrupts from the programmable counters.
*/
for (n = 0, flag = 1; n < core_iap_npmc; n++, flag <<= 1) {
if ((intrstatus & flag) == 0)
continue;
found_interrupt = 1;
pm = cc->pc_corepmcs[n].phw_pmc;
if (pm == NULL || pm->pm_state != PMC_STATE_RUNNING ||
!PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
continue;
error = pmc_process_interrupt(PMC_HR, pm, tf);
if (error)
intrenable &= ~flag;
v = iap_reload_count_to_perfctr_value(pm->pm_sc.pm_reloadcount);
PMCDBG3(MDP,INT, 1, "iap-intr cpu=%d error=%d v=%jx", cpu, error,
(uintmax_t) v);
/* Reload sampling count. */
wrmsr(core_iap_wroffset + IAP_PMC0 + n, v);
}
/*
* Reenable all non-stalled PMCs.
*/
PMCDBG2(MDP,INT, 1, "cpu=%d intrenable=%jx", cpu,
(uintmax_t) intrenable);
cc->pc_globalctrl |= intrenable;
wrmsr(IA_GLOBAL_CTRL, cc->pc_globalctrl & IA_GLOBAL_CTRL_MASK);
PMCDBG5(MDP,INT, 1, "cpu=%d fixedctrl=%jx globalctrl=%jx status=%jx "
"ovf=%jx", cpu, (uintmax_t) rdmsr(IAF_CTRL),
(uintmax_t) rdmsr(IA_GLOBAL_CTRL),
(uintmax_t) rdmsr(IA_GLOBAL_STATUS),
(uintmax_t) rdmsr(IA_GLOBAL_OVF_CTRL));
if (found_interrupt)
lapic_reenable_pmc();
if (found_interrupt)
counter_u64_add(pmc_stats.pm_intr_processed, 1);
else
counter_u64_add(pmc_stats.pm_intr_ignored, 1);
return (found_interrupt);
}
int
pmc_core_initialize(struct pmc_mdep *md, int maxcpu, int version_override)
{
int cpuid[CORE_CPUID_REQUEST_SIZE];
int ipa_version, flags, nflags;
do_cpuid(CORE_CPUID_REQUEST, cpuid);
ipa_version = (version_override > 0) ? version_override :
cpuid[CORE_CPUID_EAX] & 0xFF;
core_cputype = md->pmd_cputype;
PMCDBG3(MDP,INI,1,"core-init cputype=%d ncpu=%d ipa-version=%d",
core_cputype, maxcpu, ipa_version);
if (ipa_version < 1 || ipa_version > 4 ||
(core_cputype != PMC_CPU_INTEL_CORE && ipa_version == 1)) {
/* Unknown PMC architecture. */
printf("hwpc_core: unknown PMC architecture: %d\n",
ipa_version);
return (EPROGMISMATCH);
}
core_iap_wroffset = 0;
if (cpu_feature2 & CPUID2_PDCM) {
if (rdmsr(IA32_PERF_CAPABILITIES) & PERFCAP_FW_WRITE) {
PMCDBG0(MDP, INI, 1,
"core-init full-width write supported");
core_iap_wroffset = IAP_A_PMC0 - IAP_PMC0;
} else
PMCDBG0(MDP, INI, 1,
"core-init full-width write NOT supported");
} else
PMCDBG0(MDP, INI, 1, "core-init pdcm not supported");
core_pmcmask = 0;
/*
* Initialize programmable counters.
*/
core_iap_npmc = (cpuid[CORE_CPUID_EAX] >> 8) & 0xFF;
core_iap_width = (cpuid[CORE_CPUID_EAX] >> 16) & 0xFF;
core_pmcmask |= ((1ULL << core_iap_npmc) - 1);
nflags = (cpuid[CORE_CPUID_EAX] >> 24) & 0xFF;
flags = cpuid[CORE_CPUID_EBX] & ((1 << nflags) - 1);
iap_initialize(md, maxcpu, core_iap_npmc, core_iap_width, flags);
/*
* Initialize fixed function counters, if present.
*/
if (core_cputype != PMC_CPU_INTEL_CORE) {
core_iaf_ri = core_iap_npmc;
core_iaf_npmc = cpuid[CORE_CPUID_EDX] & 0x1F;
core_iaf_width = (cpuid[CORE_CPUID_EDX] >> 5) & 0xFF;
iaf_initialize(md, maxcpu, core_iaf_npmc, core_iaf_width);
core_pmcmask |= ((1ULL << core_iaf_npmc) - 1) << IAF_OFFSET;
}
PMCDBG2(MDP,INI,1,"core-init pmcmask=0x%jx iafri=%d", core_pmcmask,
core_iaf_ri);
core_pcpu = malloc(sizeof(*core_pcpu) * maxcpu, M_PMC,
M_ZERO | M_WAITOK);
/*
* Choose the appropriate interrupt handler.
*/
if (ipa_version == 1)
md->pmd_intr = core_intr;
else
md->pmd_intr = core2_intr;
md->pmd_pcpu_fini = NULL;
md->pmd_pcpu_init = NULL;
return (0);
}
void
pmc_core_finalize(struct pmc_mdep *md)
{
PMCDBG0(MDP,INI,1, "core-finalize");
free(core_pcpu, M_PMC);
core_pcpu = NULL;
}
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