From patchwork Wed May 11 21:59:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Atish Kumar Patra X-Patchwork-Id: 12846684 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 22725C433EF for ; Wed, 11 May 2022 22:20:39 +0000 (UTC) Received: from localhost ([::1]:51878 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nouhC-0004zI-6D for qemu-devel@archiver.kernel.org; Wed, 11 May 2022 18:20:38 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:48092) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nouNb-0004kK-Be for qemu-devel@nongnu.org; Wed, 11 May 2022 18:00:24 -0400 Received: from mail-pj1-x102f.google.com ([2607:f8b0:4864:20::102f]:51055) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1nouNY-0006jd-2u for qemu-devel@nongnu.org; Wed, 11 May 2022 18:00:22 -0400 Received: by mail-pj1-x102f.google.com with SMTP id iq10so3487155pjb.0 for ; Wed, 11 May 2022 15:00:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=pQGnt2eXe1zGsuerk1F2XmRapPXuxH8X8KisswQPfDc=; b=q/3PWZCnr56YadHNKtZ8vrbEvAlNmC4q73zJ7Wi7tyNBAgOEayhJzyk0OradNJh4UO OFUTI5LOMxliorMHWTrzoJfTG/ijZcNrcDWm548lCp5zjQl4h6lv+gkkeEcc+Y7KFI9F A7YQHT9FvOFhnMej76yVGxW3oejn4PRlSkgNjQNiWq+KrUVdZ8Fh+vDmDTqQQWCnpphk 3QMxvVWmBT8BzW+8a3soWBQ4c3sTAZwF7YBia2x9RyU0x8rOezhjl3hgmFlW7DFuQMcj Zqnd+SZg0tK4Hvx7RRcFXu63Go5TCP7ah6FLywcZ76pxqu0/kyNIer2XlDdVblfAgB7M c1kw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=pQGnt2eXe1zGsuerk1F2XmRapPXuxH8X8KisswQPfDc=; b=0YfgKsdbHudei4aHqy/juhwwU4FE/GYvNXFnwMkDo4y0RMyn09XsINbLmN0+osAmkj GPFvaOnXBMyhNwqxB69pDLolJWSgLqd1WzTY8+B54rv7klDrQV7RlM0a4HmxsOPqta3H W5T3DzK6Y0ffkDcY+7UA9/3NXIRk1p3c89XFdmxvq2/I7waD06W/dZH+Noh9ZjayyyXj p9r7GawxV9e/5lpryjefepv8gGDlmU9I8T1RURW6h1I3zwC1FrgokRbAJIRKSYcjNUS/ XZZz3B1yKHE7YOPwcIt79EdUlrmOK3C2kTe7C8K2ABGFR3nhpvS0FAJgjdysB4Wwsq/x kKHQ== X-Gm-Message-State: AOAM53297NKK620JecbafiVMvgZ2pIUay/R4v5aHFZsj5cDJV7q9Xhin O49/ZrFXqX2UyvK37+8ShViXdQ== X-Google-Smtp-Source: ABdhPJwZjStvC6vw9CM2CAa6skmiVOVumO9jyWfyCB2196rdIM06bHEwTF+k9VQm2bCwBYuuj+KBfQ== X-Received: by 2002:a17:902:da85:b0:15e:8e05:6963 with SMTP id j5-20020a170902da8500b0015e8e056963mr27492730plx.94.1652306418605; Wed, 11 May 2022 15:00:18 -0700 (PDT) Received: from atishp.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id r23-20020a62e417000000b0050dc762816asm2261303pfh.68.2022.05.11.15.00.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 May 2022 15:00:17 -0700 (PDT) From: Atish Patra To: linux-kernel@vger.kernel.org Cc: Alistair Francis , Atish Patra , Bin Meng , Palmer Dabbelt , qemu-devel@nongnu.org, qemu-riscv@nongnu.org Subject: [PATCH v8 07/12] target/riscv: Support mcycle/minstret write operation Date: Wed, 11 May 2022 14:59:51 -0700 Message-Id: <20220511215956.2351243-8-atishp@rivosinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220511215956.2351243-1-atishp@rivosinc.com> References: <20220511215956.2351243-1-atishp@rivosinc.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::102f; envelope-from=atishp@rivosinc.com; helo=mail-pj1-x102f.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action 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: , 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. Reviewed-by: Alistair Francis Signed-off-by: Atish Patra Signed-off-by: Atish Patra --- target/riscv/cpu.h | 23 ++++-- target/riscv/csr.c | 157 ++++++++++++++++++++++++++++----------- target/riscv/machine.c | 25 ++++++- target/riscv/meson.build | 3 +- target/riscv/pmu.c | 32 ++++++++ target/riscv/pmu.h | 28 +++++++ 6 files changed, 214 insertions(+), 54 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 32cdd9070be5..f60072e0fd3d 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -111,7 +111,7 @@ typedef struct CPUArchState 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) @@ -121,6 +121,18 @@ FIELD(VTYPE, VMA, 7, 1) FIELD(VTYPE, VEDIV, 8, 2) FIELD(VTYPE, RESERVED, 10, sizeof(target_ulong) * 8 - 11) +typedef 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; +} PMUCTRState; + struct CPUArchState { target_ulong gpr[32]; target_ulong gprh[32]; /* 64 top bits of the 128-bit registers */ @@ -273,13 +285,10 @@ struct CPUArchState { 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 87aa601e5ddb..c050ed2e2c1b 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -21,6 +21,7 @@ #include "qemu/log.h" #include "qemu/timer.h" #include "cpu.h" +#include "pmu.h" #include "qemu/main-loop.h" #include "exec/exec-all.h" #include "sysemu/cpu-timers.h" @@ -597,34 +598,28 @@ 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_ticks(bool shift) { + 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 (shift) { + 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; } #if defined(CONFIG_USER_ONLY) @@ -642,11 +637,23 @@ static RISCVException read_timeh(CPURISCVState *env, int csrno, return RISCV_EXCP_NONE; } +static int read_hpmcounter(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val = get_ticks(false); + return RISCV_EXCP_NONE; +} + +static int read_hpmcounterh(CPURISCVState *env, int csrno, target_ulong *val) +{ + *val = get_ticks(true); + return RISCV_EXCP_NONE; +} + #else /* CONFIG_USER_ONLY */ 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]; @@ -655,7 +662,7 @@ 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; @@ -664,52 +671,102 @@ 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_ticks(false); + } else { + /* Other counters can keep incrementing from the given value */ + counter->mhpmcounter_prev = val; + } 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]; - env->mhpmcounterh_val[ctr_index] = val; + 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_ticks(true); + } else { + counter->mhpmcounterh_prev = val; + } + + return RISCV_EXCP_NONE; +} + +static RISCVException riscv_pmu_read_ctr(CPURISCVState *env, target_ulong *val, + bool upper_half, uint32_t ctr_idx) +{ + PMUCTRState counter = env->pmu_ctrs[ctr_idx]; + target_ulong ctr_prev = upper_half ? counter.mhpmcounterh_prev : + counter.mhpmcounter_prev; + target_ulong ctr_val = upper_half ? counter.mhpmcounterh_val : + counter.mhpmcounter_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 counter value written by + * the supervisor 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; + } + } + + + /** + * The kernel computes the perf delta by subtracting the current value from + * the value it initialized previously (ctr_val). + */ + if (riscv_pmu_ctr_monitor_cycles(env, ctr_idx) || + riscv_pmu_ctr_monitor_instructions(env, ctr_idx)) { + *val = get_ticks(upper_half) - ctr_prev + ctr_val; + } else { + *val = 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); } - static RISCVException read_time(CPURISCVState *env, int csrno, target_ulong *val) { @@ -1564,11 +1621,23 @@ 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; } @@ -3526,10 +3595,10 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = { [CSR_VLENB] = { "vlenb", vs, read_vlenb, .min_priv_ver = PRIV_VERSION_1_12_0 }, /* 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 @@ -3543,10 +3612,10 @@ 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_mvendorid }, diff --git a/target/riscv/machine.c b/target/riscv/machine.c index 99193c85bb97..dc182ca81119 100644 --- a/target/riscv/machine.c +++ b/target/riscv/machine.c @@ -279,7 +279,28 @@ static const VMStateDescription vmstate_envcfg = { VMSTATE_UINT64(env.menvcfg, RISCVCPU), VMSTATE_UINTTL(env.senvcfg, RISCVCPU), VMSTATE_UINT64(env.henvcfg, RISCVCPU), + VMSTATE_END_OF_LIST() + } +}; + +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() } }; @@ -331,8 +352,8 @@ 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 096249f3a30f..2c1975e72c4e 100644 --- a/target/riscv/meson.build +++ b/target/riscv/meson.build @@ -30,7 +30,8 @@ riscv_softmmu_ss.add(files( 'pmp.c', 'debug.c', 'monitor.c', - 'machine.c' + 'machine.c', + 'pmu.c' )) target_arch += {'riscv': riscv_ss} 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);