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[70.228.75.190]) by smtp.gmail.com with ESMTPSA id e4sm678441oiy.12.2022.01.06.16.49.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Jan 2022 16:49:34 -0800 (PST) From: Atish Patra To: qemu-devel@nongnu.org Subject: [PATCH v4 07/11] target/riscv: Support mcycle/minstret write operation Date: Thu, 6 Jan 2022 16:48:42 -0800 Message-Id: <20220107004846.378859-8-atishp@rivosinc.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220107004846.378859-1-atishp@rivosinc.com> References: <20220107004846.378859-1-atishp@rivosinc.com> MIME-Version: 1.0 X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::22e (failed) Received-SPF: pass client-ip=2607:f8b0:4864:20::22e; envelope-from=atishp@rivosinc.com; helo=mail-oi1-x22e.google.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Thu, 06 Jan 2022 21:14:01 -0500 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alistair Francis , Bin Meng , Atish Patra , Palmer Dabbelt , qemu-riscv@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Atish Patra mcycle/minstret are actually WARL registers and can be written with any given value. With SBI PMU extension, it will be used to store a initial value provided from supervisor OS. The Qemu also need prohibit the counter increment if mcountinhibit is set. Support mcycle/minstret through generic counter infrastructure. Signed-off-by: Atish Patra Signed-off-by: Atish Patra --- target/riscv/cpu.h | 24 +++++-- target/riscv/csr.c | 144 ++++++++++++++++++++++++++------------- target/riscv/machine.c | 26 ++++++- target/riscv/meson.build | 1 + target/riscv/pmu.c | 32 +++++++++ target/riscv/pmu.h | 28 ++++++++ 6 files changed, 200 insertions(+), 55 deletions(-) create mode 100644 target/riscv/pmu.c create mode 100644 target/riscv/pmu.h diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h index 39edc948d703..5fe9c51b38c7 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -101,7 +101,7 @@ typedef struct CPURISCVState CPURISCVState; #endif #define RV_VLEN_MAX 1024 -#define RV_MAX_MHPMEVENTS 29 +#define RV_MAX_MHPMEVENTS 32 #define RV_MAX_MHPMCOUNTERS 32 FIELD(VTYPE, VLMUL, 0, 3) @@ -112,6 +112,19 @@ FIELD(VTYPE, VEDIV, 8, 2) FIELD(VTYPE, RESERVED, 10, sizeof(target_ulong) * 8 - 11) FIELD(VTYPE, VILL, sizeof(target_ulong) * 8 - 1, 1) +typedef struct PMUCTRState PMUCTRState; +struct PMUCTRState { + /* Current value of a counter */ + target_ulong mhpmcounter_val; + /* Current value of a counter in RV32*/ + target_ulong mhpmcounterh_val; + /* Snapshot values of counter */ + target_ulong mhpmcounter_prev; + /* Snapshort value of a counter in RV32 */ + target_ulong mhpmcounterh_prev; + bool started; +}; + struct CPURISCVState { target_ulong gpr[32]; uint64_t fpr[32]; /* assume both F and D extensions */ @@ -226,13 +239,10 @@ struct CPURISCVState { target_ulong mcountinhibit; - /* PMU counter configured values */ - target_ulong mhpmcounter_val[RV_MAX_MHPMCOUNTERS]; - - /* for RV32 */ - target_ulong mhpmcounterh_val[RV_MAX_MHPMCOUNTERS]; + /* PMU counter state */ + PMUCTRState pmu_ctrs[RV_MAX_MHPMCOUNTERS]; - /* PMU event selector configured values */ + /* PMU event selector configured values. First three are unused*/ target_ulong mhpmevent_val[RV_MAX_MHPMEVENTS]; target_ulong sscratch; diff --git a/target/riscv/csr.c b/target/riscv/csr.c index 58a9550bd898..d4449ada557c 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -20,6 +20,7 @@ #include "qemu/osdep.h" #include "qemu/log.h" #include "cpu.h" +#include "pmu.h" #include "qemu/main-loop.h" #include "exec/exec-all.h" @@ -461,41 +462,33 @@ static int write_vcsr(CPURISCVState *env, int csrno, target_ulong val) } /* User Timers and Counters */ -static RISCVException read_instret(CPURISCVState *env, int csrno, - target_ulong *val) +static target_ulong get_icount_ticks(bool brv32) { + int64_t val; + target_ulong result; + #if !defined(CONFIG_USER_ONLY) if (icount_enabled()) { - *val = icount_get(); + val = icount_get(); } else { - *val = cpu_get_host_ticks(); + val = cpu_get_host_ticks(); } #else - *val = cpu_get_host_ticks(); + val = cpu_get_host_ticks(); #endif - return RISCV_EXCP_NONE; -} - -static RISCVException read_instreth(CPURISCVState *env, int csrno, - target_ulong *val) -{ -#if !defined(CONFIG_USER_ONLY) - if (icount_enabled()) { - *val = icount_get() >> 32; + if (brv32) { + result = val >> 32; } else { - *val = cpu_get_host_ticks() >> 32; + result = val; } -#else - *val = cpu_get_host_ticks() >> 32; -#endif - return RISCV_EXCP_NONE; + return result; } static int read_mhpmevent(CPURISCVState *env, int csrno, target_ulong *val) { - int evt_index = csrno - CSR_MHPMEVENT3; + int evt_index = csrno - CSR_MCOUNTINHIBIT; *val = env->mhpmevent_val[evt_index]; @@ -504,7 +497,7 @@ static int read_mhpmevent(CPURISCVState *env, int csrno, target_ulong *val) static int write_mhpmevent(CPURISCVState *env, int csrno, target_ulong val) { - int evt_index = csrno - CSR_MHPMEVENT3; + int evt_index = csrno - CSR_MCOUNTINHIBIT; env->mhpmevent_val[evt_index] = val; @@ -513,52 +506,99 @@ static int write_mhpmevent(CPURISCVState *env, int csrno, target_ulong val) static int write_mhpmcounter(CPURISCVState *env, int csrno, target_ulong val) { - int ctr_index = csrno - CSR_MHPMCOUNTER3 + 3; + int ctr_idx = csrno - CSR_MCYCLE; + PMUCTRState *counter = &env->pmu_ctrs[ctr_idx]; - env->mhpmcounter_val[ctr_index] = val; + counter->mhpmcounter_val = val; + if (riscv_pmu_ctr_monitor_cycles(env, ctr_idx) || + riscv_pmu_ctr_monitor_instructions(env, ctr_idx)) { + counter->mhpmcounter_prev = get_icount_ticks(false); + } else { + /* Other counters can keep incrementing from the given value */ + counter->mhpmcounter_prev = val; + } - return RISCV_EXCP_NONE; + return RISCV_EXCP_NONE; } static int write_mhpmcounterh(CPURISCVState *env, int csrno, target_ulong val) { - int ctr_index = csrno - CSR_MHPMCOUNTER3H + 3; + int ctr_idx = csrno - CSR_MCYCLEH; + PMUCTRState *counter = &env->pmu_ctrs[ctr_idx]; + + counter->mhpmcounterh_val = val; + if (riscv_pmu_ctr_monitor_cycles(env, ctr_idx) || + riscv_pmu_ctr_monitor_instructions(env, ctr_idx)) { + counter->mhpmcounterh_prev = get_icount_ticks(false); + } else { + counter->mhpmcounterh_prev = val; + } + + return RISCV_EXCP_NONE; +} + +static RISCVException riscv_pmu_read_ctr(CPURISCVState *env, target_ulong *val, + bool is_uh, uint32_t ctr_idx) +{ + PMUCTRState counter = env->pmu_ctrs[ctr_idx]; + target_ulong ctr_prev = is_uh ? counter.mhpmcounterh_prev : + counter.mhpmcounter_prev; + target_ulong ctr_val = is_uh ? counter.mhpmcounterh_val : + counter.mhpmcounter_val; - env->mhpmcounterh_val[ctr_index] = val; + if (get_field(env->mcountinhibit, BIT(ctr_idx))) { + /** + * Counter should not increment if inhibit bit is set. We can't really + * stop the icount counting. Just return the previous value to indicate + * that counter was not incremented. + */ + if (!counter.started) { + *val = ctr_val; + return RISCV_EXCP_NONE; + } else { + /* Mark that the counter has been stopped */ + counter.started = false; + } + } + if (riscv_pmu_ctr_monitor_cycles(env, ctr_idx) || + riscv_pmu_ctr_monitor_instructions(env, ctr_idx)) { + *val = get_icount_ticks(is_uh); + } else { + *val = ctr_val; + } + + /* No need to handle the overflow here */ + *val = *val - ctr_prev + ctr_val; return RISCV_EXCP_NONE; } static int read_hpmcounter(CPURISCVState *env, int csrno, target_ulong *val) { - int ctr_index; + uint16_t ctr_index; if (env->priv == PRV_M) { - ctr_index = csrno - CSR_MHPMCOUNTER3 + 3; + ctr_index = csrno - CSR_MCYCLE; } else { - ctr_index = csrno - CSR_HPMCOUNTER3 + 3; + ctr_index = csrno - CSR_CYCLE; } - *val = env->mhpmcounter_val[ctr_index]; - return RISCV_EXCP_NONE; + return riscv_pmu_read_ctr(env, val, false, ctr_index); } static int read_hpmcounterh(CPURISCVState *env, int csrno, target_ulong *val) { - int ctr_index; + uint16_t ctr_index; if (env->priv == PRV_M) { - ctr_index = csrno - CSR_MHPMCOUNTER3H + 3; + ctr_index = csrno - CSR_MCYCLEH; } else { - ctr_index = csrno - CSR_HPMCOUNTER3H + 3; + ctr_index = csrno - CSR_CYCLEH; } - *val = env->mhpmcounterh_val[ctr_index]; - - return RISCV_EXCP_NONE; + return riscv_pmu_read_ctr(env, val, true, ctr_index); } - #if defined(CONFIG_USER_ONLY) static RISCVException read_time(CPURISCVState *env, int csrno, target_ulong *val) @@ -925,11 +965,23 @@ static RISCVException read_mcountinhibit(CPURISCVState *env, int csrno, static RISCVException write_mcountinhibit(CPURISCVState *env, int csrno, target_ulong val) { + int cidx; + PMUCTRState *counter; + if (env->priv_ver < PRIV_VERSION_1_11_0) { return RISCV_EXCP_ILLEGAL_INST; } env->mcountinhibit = val; + + /* Check if any other counter is also monitoring cycles/instructions */ + for (cidx = 0; cidx < RV_MAX_MHPMCOUNTERS; cidx++) { + if (!get_field(env->mcountinhibit, BIT(cidx))) { + counter = &env->pmu_ctrs[cidx]; + counter->started = true; + } + } + return RISCV_EXCP_NONE; } @@ -2035,10 +2087,10 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = { [CSR_VTYPE] = { "vtype", vs, read_vtype }, [CSR_VLENB] = { "vlenb", vs, read_vlenb }, /* User Timers and Counters */ - [CSR_CYCLE] = { "cycle", ctr, read_instret }, - [CSR_INSTRET] = { "instret", ctr, read_instret }, - [CSR_CYCLEH] = { "cycleh", ctr32, read_instreth }, - [CSR_INSTRETH] = { "instreth", ctr32, read_instreth }, + [CSR_CYCLE] = { "cycle", ctr, read_hpmcounter }, + [CSR_INSTRET] = { "instret", ctr, read_hpmcounter }, + [CSR_CYCLEH] = { "cycleh", ctr32, read_hpmcounterh }, + [CSR_INSTRETH] = { "instreth", ctr32, read_hpmcounterh }, /* * In privileged mode, the monitor will have to emulate TIME CSRs only if @@ -2049,10 +2101,10 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = { #if !defined(CONFIG_USER_ONLY) /* Machine Timers and Counters */ - [CSR_MCYCLE] = { "mcycle", any, read_instret }, - [CSR_MINSTRET] = { "minstret", any, read_instret }, - [CSR_MCYCLEH] = { "mcycleh", any32, read_instreth }, - [CSR_MINSTRETH] = { "minstreth", any32, read_instreth }, + [CSR_MCYCLE] = { "mcycle", any, read_hpmcounter, write_mhpmcounter}, + [CSR_MINSTRET] = { "minstret", any, read_hpmcounter, write_mhpmcounter}, + [CSR_MCYCLEH] = { "mcycleh", any32, read_hpmcounterh, write_mhpmcounterh}, + [CSR_MINSTRETH] = { "minstreth", any32, read_hpmcounterh, write_mhpmcounterh}, /* Machine Information Registers */ [CSR_MVENDORID] = { "mvendorid", any, read_zero }, diff --git a/target/riscv/machine.c b/target/riscv/machine.c index d10a3d7472cb..829b9f2d1f46 100644 --- a/target/riscv/machine.c +++ b/target/riscv/machine.c @@ -164,6 +164,28 @@ static const VMStateDescription vmstate_pointermasking = { } }; +static bool pmu_needed(void *opaque) +{ + RISCVCPU *cpu = opaque; + + return cpu->cfg.pmu_num; +} + +static const VMStateDescription vmstate_pmu_ctr_state = { + .name = "cpu/pmu", + .version_id = 1, + .minimum_version_id = 1, + .needed = pmu_needed, + .fields = (VMStateField[]) { + VMSTATE_UINTTL(mhpmcounter_val, PMUCTRState), + VMSTATE_UINTTL(mhpmcounterh_val, PMUCTRState), + VMSTATE_UINTTL(mhpmcounter_prev, PMUCTRState), + VMSTATE_UINTTL(mhpmcounterh_prev, PMUCTRState), + VMSTATE_BOOL(started, PMUCTRState), + VMSTATE_END_OF_LIST() + } +}; + const VMStateDescription vmstate_riscv_cpu = { .name = "cpu", .version_id = 3, @@ -206,8 +228,8 @@ const VMStateDescription vmstate_riscv_cpu = { VMSTATE_UINTTL(env.scounteren, RISCVCPU), VMSTATE_UINTTL(env.mcounteren, RISCVCPU), VMSTATE_UINTTL(env.mcountinhibit, RISCVCPU), - VMSTATE_UINTTL_ARRAY(env.mhpmcounter_val, RISCVCPU, RV_MAX_MHPMCOUNTERS), - VMSTATE_UINTTL_ARRAY(env.mhpmcounterh_val, RISCVCPU, RV_MAX_MHPMCOUNTERS), + VMSTATE_STRUCT_ARRAY(env.pmu_ctrs, RISCVCPU, RV_MAX_MHPMCOUNTERS, 0, + vmstate_pmu_ctr_state, PMUCTRState), VMSTATE_UINTTL_ARRAY(env.mhpmevent_val, RISCVCPU, RV_MAX_MHPMEVENTS), VMSTATE_UINTTL(env.sscratch, RISCVCPU), VMSTATE_UINTTL(env.mscratch, RISCVCPU), diff --git a/target/riscv/meson.build b/target/riscv/meson.build index d5e0bc93ea9c..992122c4d6f5 100644 --- a/target/riscv/meson.build +++ b/target/riscv/meson.build @@ -24,6 +24,7 @@ riscv_softmmu_ss = ss.source_set() riscv_softmmu_ss.add(files( 'arch_dump.c', 'pmp.c', + 'pmu.c', 'monitor.c', 'machine.c' )) diff --git a/target/riscv/pmu.c b/target/riscv/pmu.c new file mode 100644 index 000000000000..000fe8da45ef --- /dev/null +++ b/target/riscv/pmu.c @@ -0,0 +1,32 @@ +/* + * RISC-V PMU file. + * + * Copyright (c) 2021 Western Digital Corporation or its affiliates. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2 or later, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see . + */ + +#include "qemu/osdep.h" +#include "cpu.h" +#include "pmu.h" + +bool riscv_pmu_ctr_monitor_instructions(CPURISCVState *env, + uint32_t target_ctr) +{ + return (target_ctr == 0) ? true : false; +} + +bool riscv_pmu_ctr_monitor_cycles(CPURISCVState *env, uint32_t target_ctr) +{ + return (target_ctr == 2) ? true : false; +} diff --git a/target/riscv/pmu.h b/target/riscv/pmu.h new file mode 100644 index 000000000000..58a5bc3a4089 --- /dev/null +++ b/target/riscv/pmu.h @@ -0,0 +1,28 @@ +/* + * RISC-V PMU header file. + * + * Copyright (c) 2021 Western Digital Corporation or its affiliates. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2 or later, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see . + */ + +#include "qemu/osdep.h" +#include "qemu/log.h" +#include "cpu.h" +#include "qemu/main-loop.h" +#include "exec/exec-all.h" + +bool riscv_pmu_ctr_monitor_instructions(CPURISCVState *env, + uint32_t target_ctr); +bool riscv_pmu_ctr_monitor_cycles(CPURISCVState *env, + uint32_t target_ctr);