qemu-e2k/target/ppc/power8-pmu.c

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/*
* PMU emulation helpers for TCG IBM POWER chips
*
* Copyright IBM Corp. 2021
*
* Authors:
* Daniel Henrique Barboza <danielhb413@gmail.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "helper_regs.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#include "qemu/error-report.h"
#include "qemu/main-loop.h"
#include "hw/ppc/ppc.h"
#include "power8-pmu.h"
#if defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY)
#define PMC_COUNTER_NEGATIVE_VAL 0x80000000UL
static bool pmc_has_overflow_enabled(CPUPPCState *env, int sprn)
{
if (sprn == SPR_POWER_PMC1) {
return env->spr[SPR_POWER_MMCR0] & MMCR0_PMC1CE;
}
return env->spr[SPR_POWER_MMCR0] & MMCR0_PMCjCE;
}
void pmu_update_summaries(CPUPPCState *env)
{
target_ulong mmcr0 = env->spr[SPR_POWER_MMCR0];
target_ulong mmcr1 = env->spr[SPR_POWER_MMCR1];
int ins_cnt = 0;
int cyc_cnt = 0;
if (mmcr0 & MMCR0_FC) {
goto hflags_calc;
}
if (!(mmcr0 & MMCR0_FC14) && mmcr1 != 0) {
target_ulong sel;
sel = extract64(mmcr1, MMCR1_PMC1EVT_EXTR, MMCR1_EVT_SIZE);
switch (sel) {
case 0x02:
case 0xfe:
ins_cnt |= 1 << 1;
break;
case 0x1e:
case 0xf0:
cyc_cnt |= 1 << 1;
break;
}
sel = extract64(mmcr1, MMCR1_PMC2EVT_EXTR, MMCR1_EVT_SIZE);
ins_cnt |= (sel == 0x02) << 2;
cyc_cnt |= (sel == 0x1e) << 2;
sel = extract64(mmcr1, MMCR1_PMC3EVT_EXTR, MMCR1_EVT_SIZE);
ins_cnt |= (sel == 0x02) << 3;
cyc_cnt |= (sel == 0x1e) << 3;
sel = extract64(mmcr1, MMCR1_PMC4EVT_EXTR, MMCR1_EVT_SIZE);
ins_cnt |= ((sel == 0xfa) || (sel == 0x2)) << 4;
cyc_cnt |= (sel == 0x1e) << 4;
}
ins_cnt |= !(mmcr0 & MMCR0_FC56) << 5;
cyc_cnt |= !(mmcr0 & MMCR0_FC56) << 6;
hflags_calc:
env->pmc_ins_cnt = ins_cnt;
env->pmc_cyc_cnt = cyc_cnt;
env->hflags = deposit32(env->hflags, HFLAGS_INSN_CNT, 1, ins_cnt != 0);
}
static bool pmu_increment_insns(CPUPPCState *env, uint32_t num_insns)
{
target_ulong mmcr0 = env->spr[SPR_POWER_MMCR0];
unsigned ins_cnt = env->pmc_ins_cnt;
bool overflow_triggered = false;
target_ulong tmp;
if (unlikely(ins_cnt & 0x1e)) {
if (ins_cnt & (1 << 1)) {
tmp = env->spr[SPR_POWER_PMC1];
tmp += num_insns;
if (tmp >= PMC_COUNTER_NEGATIVE_VAL && (mmcr0 & MMCR0_PMC1CE)) {
tmp = PMC_COUNTER_NEGATIVE_VAL;
overflow_triggered = true;
}
env->spr[SPR_POWER_PMC1] = tmp;
}
if (ins_cnt & (1 << 2)) {
tmp = env->spr[SPR_POWER_PMC2];
tmp += num_insns;
if (tmp >= PMC_COUNTER_NEGATIVE_VAL && (mmcr0 & MMCR0_PMCjCE)) {
tmp = PMC_COUNTER_NEGATIVE_VAL;
overflow_triggered = true;
}
env->spr[SPR_POWER_PMC2] = tmp;
}
if (ins_cnt & (1 << 3)) {
tmp = env->spr[SPR_POWER_PMC3];
tmp += num_insns;
if (tmp >= PMC_COUNTER_NEGATIVE_VAL && (mmcr0 & MMCR0_PMCjCE)) {
tmp = PMC_COUNTER_NEGATIVE_VAL;
overflow_triggered = true;
}
env->spr[SPR_POWER_PMC3] = tmp;
}
if (ins_cnt & (1 << 4)) {
target_ulong mmcr1 = env->spr[SPR_POWER_MMCR1];
int sel = extract64(mmcr1, MMCR1_PMC4EVT_EXTR, MMCR1_EVT_SIZE);
if (sel == 0x02 || (env->spr[SPR_CTRL] & CTRL_RUN)) {
tmp = env->spr[SPR_POWER_PMC4];
tmp += num_insns;
if (tmp >= PMC_COUNTER_NEGATIVE_VAL && (mmcr0 & MMCR0_PMCjCE)) {
tmp = PMC_COUNTER_NEGATIVE_VAL;
overflow_triggered = true;
}
env->spr[SPR_POWER_PMC4] = tmp;
}
}
}
if (ins_cnt & (1 << 5)) {
tmp = env->spr[SPR_POWER_PMC5];
tmp += num_insns;
if (tmp >= PMC_COUNTER_NEGATIVE_VAL && (mmcr0 & MMCR0_PMCjCE)) {
tmp = PMC_COUNTER_NEGATIVE_VAL;
overflow_triggered = true;
}
env->spr[SPR_POWER_PMC5] = tmp;
}
return overflow_triggered;
}
target/ppc: PMU basic cycle count for pseries TCG This patch adds the barebones of the PMU logic by enabling cycle counting. The overall logic goes as follows: - MMCR0 reg initial value is set to 0x80000000 (MMCR0_FC set) to avoid having to spin the PMU right at system init; - to retrieve the events that are being profiled, pmc_get_event() will check the current MMCR0 and MMCR1 value and return the appropriate PMUEventType. For PMCs 1-4, event 0x2 is the implementation dependent value of PMU_EVENT_INSTRUCTIONS and event 0x1E is the implementation dependent value of PMU_EVENT_CYCLES. These events are supported by IBM Power chips since Power8, at least, and the Linux Perf driver makes use of these events until kernel v5.15. For PMC1, event 0xF0 is the architected PowerISA event for cycles. Event 0xFE is the architected PowerISA event for instructions; - if the counter is frozen, either via the global MMCR0_FC bit or its individual frozen counter bits, PMU_EVENT_INACTIVE is returned; - pmu_update_cycles() will go through each counter and update the values of all PMCs that are counting cycles. This function will be called every time a MMCR0 update is done to keep counters values up to date. Upcoming patches will use this function to allow the counters to be properly updated during read/write of the PMCs and MMCR1 writes. Given that the base CPU frequency is fixed at 1Ghz for both powernv and pseries clock, cycle calculation assumes that 1 nanosecond equals 1 CPU cycle. Cycle value is then calculated by adding the elapsed time, in nanoseconds, of the last cycle update done via pmu_update_cycles(). Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-3-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-12-17 17:57:18 +01:00
static void pmu_update_cycles(CPUPPCState *env)
{
uint64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
uint64_t time_delta = now - env->pmu_base_time;
int sprn, cyc_cnt = env->pmc_cyc_cnt;
target/ppc: PMU basic cycle count for pseries TCG This patch adds the barebones of the PMU logic by enabling cycle counting. The overall logic goes as follows: - MMCR0 reg initial value is set to 0x80000000 (MMCR0_FC set) to avoid having to spin the PMU right at system init; - to retrieve the events that are being profiled, pmc_get_event() will check the current MMCR0 and MMCR1 value and return the appropriate PMUEventType. For PMCs 1-4, event 0x2 is the implementation dependent value of PMU_EVENT_INSTRUCTIONS and event 0x1E is the implementation dependent value of PMU_EVENT_CYCLES. These events are supported by IBM Power chips since Power8, at least, and the Linux Perf driver makes use of these events until kernel v5.15. For PMC1, event 0xF0 is the architected PowerISA event for cycles. Event 0xFE is the architected PowerISA event for instructions; - if the counter is frozen, either via the global MMCR0_FC bit or its individual frozen counter bits, PMU_EVENT_INACTIVE is returned; - pmu_update_cycles() will go through each counter and update the values of all PMCs that are counting cycles. This function will be called every time a MMCR0 update is done to keep counters values up to date. Upcoming patches will use this function to allow the counters to be properly updated during read/write of the PMCs and MMCR1 writes. Given that the base CPU frequency is fixed at 1Ghz for both powernv and pseries clock, cycle calculation assumes that 1 nanosecond equals 1 CPU cycle. Cycle value is then calculated by adding the elapsed time, in nanoseconds, of the last cycle update done via pmu_update_cycles(). Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-3-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-12-17 17:57:18 +01:00
for (sprn = SPR_POWER_PMC1; sprn <= SPR_POWER_PMC6; sprn++) {
if (cyc_cnt & (1 << (sprn - SPR_POWER_PMC1 + 1))) {
/*
* The pseries and powernv clock runs at 1Ghz, meaning
* that 1 nanosec equals 1 cycle.
*/
env->spr[sprn] += time_delta;
target/ppc: PMU basic cycle count for pseries TCG This patch adds the barebones of the PMU logic by enabling cycle counting. The overall logic goes as follows: - MMCR0 reg initial value is set to 0x80000000 (MMCR0_FC set) to avoid having to spin the PMU right at system init; - to retrieve the events that are being profiled, pmc_get_event() will check the current MMCR0 and MMCR1 value and return the appropriate PMUEventType. For PMCs 1-4, event 0x2 is the implementation dependent value of PMU_EVENT_INSTRUCTIONS and event 0x1E is the implementation dependent value of PMU_EVENT_CYCLES. These events are supported by IBM Power chips since Power8, at least, and the Linux Perf driver makes use of these events until kernel v5.15. For PMC1, event 0xF0 is the architected PowerISA event for cycles. Event 0xFE is the architected PowerISA event for instructions; - if the counter is frozen, either via the global MMCR0_FC bit or its individual frozen counter bits, PMU_EVENT_INACTIVE is returned; - pmu_update_cycles() will go through each counter and update the values of all PMCs that are counting cycles. This function will be called every time a MMCR0 update is done to keep counters values up to date. Upcoming patches will use this function to allow the counters to be properly updated during read/write of the PMCs and MMCR1 writes. Given that the base CPU frequency is fixed at 1Ghz for both powernv and pseries clock, cycle calculation assumes that 1 nanosecond equals 1 CPU cycle. Cycle value is then calculated by adding the elapsed time, in nanoseconds, of the last cycle update done via pmu_update_cycles(). Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-3-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-12-17 17:57:18 +01:00
}
}
/* Update base_time for future calculations */
env->pmu_base_time = now;
}
/*
* Helper function to retrieve the cycle overflow timer of the
* 'sprn' counter.
*/
static QEMUTimer *get_cyc_overflow_timer(CPUPPCState *env, int sprn)
{
return env->pmu_cyc_overflow_timers[sprn - SPR_POWER_PMC1];
}
static void pmc_update_overflow_timer(CPUPPCState *env, int sprn)
{
QEMUTimer *pmc_overflow_timer = get_cyc_overflow_timer(env, sprn);
int64_t timeout;
/*
* PMC5 does not have an overflow timer and this pointer
* will be NULL.
*/
if (!pmc_overflow_timer) {
return;
}
if (!(env->pmc_cyc_cnt & (1 << (sprn - SPR_POWER_PMC1 + 1))) ||
!pmc_has_overflow_enabled(env, sprn)) {
/* Overflow timer is not needed for this counter */
timer_del(pmc_overflow_timer);
return;
}
if (env->spr[sprn] >= PMC_COUNTER_NEGATIVE_VAL) {
timeout = 0;
} else {
timeout = PMC_COUNTER_NEGATIVE_VAL - env->spr[sprn];
}
/*
* Use timer_mod_anticipate() because an overflow timer might
* be already running for this PMC.
*/
timer_mod_anticipate(pmc_overflow_timer, env->pmu_base_time + timeout);
}
static void pmu_update_overflow_timers(CPUPPCState *env)
{
int sprn;
/*
* Scroll through all PMCs and start counter overflow timers for
* PM_CYC events, if needed.
*/
for (sprn = SPR_POWER_PMC1; sprn <= SPR_POWER_PMC6; sprn++) {
pmc_update_overflow_timer(env, sprn);
}
}
target/ppc: PMU basic cycle count for pseries TCG This patch adds the barebones of the PMU logic by enabling cycle counting. The overall logic goes as follows: - MMCR0 reg initial value is set to 0x80000000 (MMCR0_FC set) to avoid having to spin the PMU right at system init; - to retrieve the events that are being profiled, pmc_get_event() will check the current MMCR0 and MMCR1 value and return the appropriate PMUEventType. For PMCs 1-4, event 0x2 is the implementation dependent value of PMU_EVENT_INSTRUCTIONS and event 0x1E is the implementation dependent value of PMU_EVENT_CYCLES. These events are supported by IBM Power chips since Power8, at least, and the Linux Perf driver makes use of these events until kernel v5.15. For PMC1, event 0xF0 is the architected PowerISA event for cycles. Event 0xFE is the architected PowerISA event for instructions; - if the counter is frozen, either via the global MMCR0_FC bit or its individual frozen counter bits, PMU_EVENT_INACTIVE is returned; - pmu_update_cycles() will go through each counter and update the values of all PMCs that are counting cycles. This function will be called every time a MMCR0 update is done to keep counters values up to date. Upcoming patches will use this function to allow the counters to be properly updated during read/write of the PMCs and MMCR1 writes. Given that the base CPU frequency is fixed at 1Ghz for both powernv and pseries clock, cycle calculation assumes that 1 nanosecond equals 1 CPU cycle. Cycle value is then calculated by adding the elapsed time, in nanoseconds, of the last cycle update done via pmu_update_cycles(). Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-3-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-12-17 17:57:18 +01:00
void helper_store_mmcr0(CPUPPCState *env, target_ulong value)
{
bool hflags_pmcc0 = (value & MMCR0_PMCC0) != 0;
bool hflags_pmcc1 = (value & MMCR0_PMCC1) != 0;
target/ppc: PMU basic cycle count for pseries TCG This patch adds the barebones of the PMU logic by enabling cycle counting. The overall logic goes as follows: - MMCR0 reg initial value is set to 0x80000000 (MMCR0_FC set) to avoid having to spin the PMU right at system init; - to retrieve the events that are being profiled, pmc_get_event() will check the current MMCR0 and MMCR1 value and return the appropriate PMUEventType. For PMCs 1-4, event 0x2 is the implementation dependent value of PMU_EVENT_INSTRUCTIONS and event 0x1E is the implementation dependent value of PMU_EVENT_CYCLES. These events are supported by IBM Power chips since Power8, at least, and the Linux Perf driver makes use of these events until kernel v5.15. For PMC1, event 0xF0 is the architected PowerISA event for cycles. Event 0xFE is the architected PowerISA event for instructions; - if the counter is frozen, either via the global MMCR0_FC bit or its individual frozen counter bits, PMU_EVENT_INACTIVE is returned; - pmu_update_cycles() will go through each counter and update the values of all PMCs that are counting cycles. This function will be called every time a MMCR0 update is done to keep counters values up to date. Upcoming patches will use this function to allow the counters to be properly updated during read/write of the PMCs and MMCR1 writes. Given that the base CPU frequency is fixed at 1Ghz for both powernv and pseries clock, cycle calculation assumes that 1 nanosecond equals 1 CPU cycle. Cycle value is then calculated by adding the elapsed time, in nanoseconds, of the last cycle update done via pmu_update_cycles(). Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-3-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-12-17 17:57:18 +01:00
pmu_update_cycles(env);
env->spr[SPR_POWER_MMCR0] = value;
/* MMCR0 writes can change HFLAGS_PMCC[01] and HFLAGS_INSN_CNT */
env->hflags = deposit32(env->hflags, HFLAGS_PMCC0, 1, hflags_pmcc0);
env->hflags = deposit32(env->hflags, HFLAGS_PMCC1, 1, hflags_pmcc1);
pmu_update_summaries(env);
/* Update cycle overflow timers with the current MMCR0 state */
pmu_update_overflow_timers(env);
target/ppc: PMU basic cycle count for pseries TCG This patch adds the barebones of the PMU logic by enabling cycle counting. The overall logic goes as follows: - MMCR0 reg initial value is set to 0x80000000 (MMCR0_FC set) to avoid having to spin the PMU right at system init; - to retrieve the events that are being profiled, pmc_get_event() will check the current MMCR0 and MMCR1 value and return the appropriate PMUEventType. For PMCs 1-4, event 0x2 is the implementation dependent value of PMU_EVENT_INSTRUCTIONS and event 0x1E is the implementation dependent value of PMU_EVENT_CYCLES. These events are supported by IBM Power chips since Power8, at least, and the Linux Perf driver makes use of these events until kernel v5.15. For PMC1, event 0xF0 is the architected PowerISA event for cycles. Event 0xFE is the architected PowerISA event for instructions; - if the counter is frozen, either via the global MMCR0_FC bit or its individual frozen counter bits, PMU_EVENT_INACTIVE is returned; - pmu_update_cycles() will go through each counter and update the values of all PMCs that are counting cycles. This function will be called every time a MMCR0 update is done to keep counters values up to date. Upcoming patches will use this function to allow the counters to be properly updated during read/write of the PMCs and MMCR1 writes. Given that the base CPU frequency is fixed at 1Ghz for both powernv and pseries clock, cycle calculation assumes that 1 nanosecond equals 1 CPU cycle. Cycle value is then calculated by adding the elapsed time, in nanoseconds, of the last cycle update done via pmu_update_cycles(). Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-3-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-12-17 17:57:18 +01:00
}
void helper_store_mmcr1(CPUPPCState *env, uint64_t value)
{
pmu_update_cycles(env);
env->spr[SPR_POWER_MMCR1] = value;
/* MMCR1 writes can change HFLAGS_INSN_CNT */
pmu_update_summaries(env);
}
target_ulong helper_read_pmc(CPUPPCState *env, uint32_t sprn)
{
pmu_update_cycles(env);
return env->spr[sprn];
}
void helper_store_pmc(CPUPPCState *env, uint32_t sprn, uint64_t value)
{
pmu_update_cycles(env);
env->spr[sprn] = value;
pmc_update_overflow_timer(env, sprn);
}
static void fire_PMC_interrupt(PowerPCCPU *cpu)
{
CPUPPCState *env = &cpu->env;
if (!(env->spr[SPR_POWER_MMCR0] & MMCR0_EBE)) {
return;
}
/* PMC interrupt not implemented yet */
return;
}
/* This helper assumes that the PMC is running. */
void helper_insns_inc(CPUPPCState *env, uint32_t num_insns)
{
bool overflow_triggered;
PowerPCCPU *cpu;
overflow_triggered = pmu_increment_insns(env, num_insns);
if (overflow_triggered) {
cpu = env_archcpu(env);
fire_PMC_interrupt(cpu);
}
}
static void cpu_ppc_pmu_timer_cb(void *opaque)
{
PowerPCCPU *cpu = opaque;
fire_PMC_interrupt(cpu);
}
void cpu_ppc_pmu_init(CPUPPCState *env)
{
PowerPCCPU *cpu = env_archcpu(env);
int i, sprn;
for (sprn = SPR_POWER_PMC1; sprn <= SPR_POWER_PMC6; sprn++) {
if (sprn == SPR_POWER_PMC5) {
continue;
}
i = sprn - SPR_POWER_PMC1;
env->pmu_cyc_overflow_timers[i] = timer_new_ns(QEMU_CLOCK_VIRTUAL,
&cpu_ppc_pmu_timer_cb,
cpu);
}
}
#endif /* defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY) */