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Thu, 07 Dec 2023 07:45:59 -0800 (PST) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, Pavel Dovgalyuk , Fam Zheng , Stefan Hajnoczi , Richard Henderson , qemu-block@nongnu.org, Paolo Bonzini , Peter Maydell , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH v2 1/5] sysemu/cpu-timers: Introduce ICountMode enumerator Date: Thu, 7 Dec 2023 16:45:46 +0100 Message-ID: <20231207154550.65087-2-philmd@linaro.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231207154550.65087-1-philmd@linaro.org> References: <20231207154550.65087-1-philmd@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::52f; envelope-from=philmd@linaro.org; helo=mail-ed1-x52f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-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=unavailable 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1701964046919100002 Rather than having to lookup for what the 0, 1, 2, ... icount values are, use a enum definition. Signed-off-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Richard Henderson --- include/sysemu/cpu-timers.h | 20 +++++++++++++------- accel/tcg/icount-common.c | 16 +++++++--------- stubs/icount.c | 2 +- system/cpu-timers.c | 2 +- target/arm/helper.c | 3 ++- 5 files changed, 24 insertions(+), 19 deletions(-) diff --git a/include/sysemu/cpu-timers.h b/include/sysemu/cpu-timers.h index 2e786fe7fb..e909ffae47 100644 --- a/include/sysemu/cpu-timers.h +++ b/include/sysemu/cpu-timers.h @@ -17,18 +17,24 @@ void cpu_timers_init(void); =20 /* icount - Instruction Counter API */ =20 -/* - * icount enablement state: +/** + * ICountMode: icount enablement state: * - * 0 =3D Disabled - Do not count executed instructions. - * 1 =3D Enabled - Fixed conversion of insn to ns via "shift" option - * 2 =3D Enabled - Runtime adaptive algorithm to compute shift + * @ICOUNT_DISABLED: Disabled - Do not count executed instructions. + * @ICOUNT_PRECISE: Enabled - Fixed conversion of insn to ns via "shift" o= ption + * @ICOUNT_ADAPTATIVE: Enabled - Runtime adaptive algorithm to compute shi= ft */ +typedef enum { + ICOUNT_DISABLED =3D 0, + ICOUNT_PRECISE =3D 1, + ICOUNT_ADAPTATIVE =3D 2, +} ICountMode; + #ifdef CONFIG_TCG -extern int use_icount; +extern ICountMode use_icount; #define icount_enabled() (use_icount) #else -#define icount_enabled() 0 +#define icount_enabled() ICOUNT_DISABLED #endif =20 /* diff --git a/accel/tcg/icount-common.c b/accel/tcg/icount-common.c index ec57192be8..067c93a9ae 100644 --- a/accel/tcg/icount-common.c +++ b/accel/tcg/icount-common.c @@ -49,21 +49,19 @@ static bool icount_sleep =3D true; /* Arbitrarily pick 1MIPS as the minimum allowable speed. */ #define MAX_ICOUNT_SHIFT 10 =20 -/* - * 0 =3D Do not count executed instructions. - * 1 =3D Fixed conversion of insn to ns via "shift" option - * 2 =3D Runtime adaptive algorithm to compute shift - */ -int use_icount; +/* Do not count executed instructions */ +ICountMode use_icount =3D ICOUNT_DISABLED; =20 static void icount_enable_precise(void) { - use_icount =3D 1; + /* Fixed conversion of insn to ns via "shift" option */ + use_icount =3D ICOUNT_PRECISE; } =20 static void icount_enable_adaptive(void) { - use_icount =3D 2; + /* Runtime adaptive algorithm to compute shift */ + use_icount =3D ICOUNT_ADAPTATIVE; } =20 /* @@ -256,7 +254,7 @@ static void icount_warp_rt(void) int64_t warp_delta; =20 warp_delta =3D clock - timers_state.vm_clock_warp_start; - if (icount_enabled() =3D=3D 2) { + if (icount_enabled() =3D=3D ICOUNT_ADAPTATIVE) { /* * In adaptive mode, do not let QEMU_CLOCK_VIRTUAL run too far * ahead of real time (it might already be ahead so careful not diff --git a/stubs/icount.c b/stubs/icount.c index 6df8c2bf7d..f8e6a014b8 100644 --- a/stubs/icount.c +++ b/stubs/icount.c @@ -4,7 +4,7 @@ =20 /* icount - Instruction Counter API */ =20 -int use_icount; +ICountMode use_icount =3D ICOUNT_DISABLED; =20 void icount_update(CPUState *cpu) { diff --git a/system/cpu-timers.c b/system/cpu-timers.c index 7452d97b67..6befb82e48 100644 --- a/system/cpu-timers.c +++ b/system/cpu-timers.c @@ -154,7 +154,7 @@ static bool adjust_timers_state_needed(void *opaque) =20 static bool icount_shift_state_needed(void *opaque) { - return icount_enabled() =3D=3D 2; + return icount_enabled() =3D=3D ICOUNT_ADAPTATIVE; } =20 /* diff --git a/target/arm/helper.c b/target/arm/helper.c index 2746d3fdac..adb0960bba 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -934,7 +934,8 @@ static int64_t cycles_ns_per(uint64_t cycles) =20 static bool instructions_supported(CPUARMState *env) { - return icount_enabled() =3D=3D 1; /* Precise instruction counting */ + /* Precise instruction counting */ + return icount_enabled() =3D=3D ICOUNT_PRECISE; } =20 static uint64_t instructions_get_count(CPUARMState *env) --=20 2.41.0 From nobody Wed Nov 27 00:42:50 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1701964046; cv=none; d=zohomail.com; s=zohoarc; b=k07EWiVrl7Oqm/FmtiO6BOyOJBnm6TLNiHkqz/reihVcWpwVVZvUGsZuY9EMn77qOGPdlGIEh//QgdLIfcNALyYOSNewb4XaWZ43zuj6chdSTL0sHxHgzxT0Sox+tFz04IQNHDjsVsI9ZzN3LNaLuv+263EgoQoZRDsRsBfpE0g= ARC-Message-Signature: i=1; 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Thu, 07 Dec 2023 07:46:05 -0800 (PST) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, Pavel Dovgalyuk , Fam Zheng , Stefan Hajnoczi , Richard Henderson , qemu-block@nongnu.org, Paolo Bonzini , Peter Maydell , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH v2 2/5] target/arm: Ensure icount is enabled when emulating INST_RETIRED Date: Thu, 7 Dec 2023 16:45:47 +0100 Message-ID: <20231207154550.65087-3-philmd@linaro.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231207154550.65087-1-philmd@linaro.org> References: <20231207154550.65087-1-philmd@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::22d; envelope-from=philmd@linaro.org; helo=mail-lj1-x22d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1701964046858100001 pmu_init() register its event checking the pm_event::supported() handler. For INST_RETIRED, the event is only registered and the bit enabled in the PMU Common Event Identification register when icount is enabled as ICOUNT_PRECISE. Assert the pm_event::get_count() and pm_event::ns_per_count() handler will only be called under this icount mode. Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- target/arm/helper.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/target/arm/helper.c b/target/arm/helper.c index adb0960bba..333fd5f4bf 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -940,11 +940,13 @@ static bool instructions_supported(CPUARMState *env) =20 static uint64_t instructions_get_count(CPUARMState *env) { + assert(icount_enabled() =3D=3D ICOUNT_PRECISE); return (uint64_t)icount_get_raw(); } =20 static int64_t instructions_ns_per(uint64_t icount) { + assert(icount_enabled() =3D=3D ICOUNT_PRECISE); return icount_to_ns((int64_t)icount); } #endif --=20 2.41.0 From nobody Wed Nov 27 00:42:50 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::52e; envelope-from=philmd@linaro.org; helo=mail-ed1-x52e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-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=unavailable 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1701964131082100002 Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- stubs/icount.c | 2 +- util/async.c | 16 +++++++++------- 2 files changed, 10 insertions(+), 8 deletions(-) diff --git a/stubs/icount.c b/stubs/icount.c index f8e6a014b8..a5202e2dd9 100644 --- a/stubs/icount.c +++ b/stubs/icount.c @@ -43,7 +43,7 @@ void icount_account_warp_timer(void) { abort(); } - void icount_notify_exit(void) { + abort(); } diff --git a/util/async.c b/util/async.c index 8f90ddc304..9007642c27 100644 --- a/util/async.c +++ b/util/async.c @@ -94,13 +94,15 @@ static void aio_bh_enqueue(QEMUBH *bh, unsigned new_fla= gs) } =20 aio_notify(ctx); - /* - * Workaround for record/replay. - * vCPU execution should be suspended when new BH is set. - * This is needed to avoid guest timeouts caused - * by the long cycles of the execution. - */ - icount_notify_exit(); + if (unlikely(icount_enabled())) { + /* + * Workaround for record/replay. + * vCPU execution should be suspended when new BH is set. + * This is needed to avoid guest timeouts caused + * by the long cycles of the execution. + */ + icount_notify_exit(); + } } =20 /* Only called from aio_bh_poll() and aio_ctx_finalize() */ --=20 2.41.0 From nobody Wed Nov 27 00:42:50 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::529; envelope-from=philmd@linaro.org; helo=mail-ed1-x529.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-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=unavailable 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1701964116360100003 Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- stubs/icount.c | 6 ------ system/vl.c | 6 +++++- 2 files changed, 5 insertions(+), 7 deletions(-) diff --git a/stubs/icount.c b/stubs/icount.c index a5202e2dd9..b060b03a73 100644 --- a/stubs/icount.c +++ b/stubs/icount.c @@ -1,5 +1,4 @@ #include "qemu/osdep.h" -#include "qapi/error.h" #include "sysemu/cpu-timers.h" =20 /* icount - Instruction Counter API */ @@ -10,11 +9,6 @@ void icount_update(CPUState *cpu) { abort(); } -void icount_configure(QemuOpts *opts, Error **errp) -{ - /* signal error */ - error_setg(errp, "cannot configure icount, TCG support not available"); -} int64_t icount_get_raw(void) { abort(); diff --git a/system/vl.c b/system/vl.c index 2bcd9efb9a..8c99c5f681 100644 --- a/system/vl.c +++ b/system/vl.c @@ -2270,7 +2270,11 @@ static void user_register_global_props(void) =20 static int do_configure_icount(void *opaque, QemuOpts *opts, Error **errp) { - icount_configure(opts, errp); + if (tcg_enabled()) { + icount_configure(opts, errp); + } else { + error_setg(errp, "cannot configure icount, TCG support not availab= le"); + } return 0; } =20 --=20 2.41.0 From nobody Wed Nov 27 00:42:50 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::636; envelope-from=philmd@linaro.org; helo=mail-ej1-x636.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1701964044682100001 Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- include/sysemu/cpu-timers.h | 2 +- include/sysemu/replay.h | 11 ++++++++--- stubs/icount.c | 19 ------------------- 3 files changed, 9 insertions(+), 23 deletions(-) diff --git a/include/sysemu/cpu-timers.h b/include/sysemu/cpu-timers.h index e909ffae47..25dfc76599 100644 --- a/include/sysemu/cpu-timers.h +++ b/include/sysemu/cpu-timers.h @@ -30,7 +30,7 @@ typedef enum { ICOUNT_ADAPTATIVE =3D 2, } ICountMode; =20 -#ifdef CONFIG_TCG +#if defined(CONFIG_TCG) && !defined(CONFIG_USER_ONLY) extern ICountMode use_icount; #define icount_enabled() (use_icount) #else diff --git a/include/sysemu/replay.h b/include/sysemu/replay.h index 08aae5869f..8102fa54f0 100644 --- a/include/sysemu/replay.h +++ b/include/sysemu/replay.h @@ -1,6 +1,3 @@ -#ifndef SYSEMU_REPLAY_H -#define SYSEMU_REPLAY_H - /* * QEMU replay (system interface) * @@ -11,6 +8,12 @@ * See the COPYING file in the top-level directory. * */ +#ifndef SYSEMU_REPLAY_H +#define SYSEMU_REPLAY_H + +#ifdef CONFIG_USER_ONLY +#error Cannot include this header from user emulation +#endif =20 #include "exec/replay-core.h" #include "qapi/qapi-types-misc.h" @@ -79,12 +82,14 @@ int64_t replay_save_clock(ReplayClockKind kind, int64_t= clock, int64_t replay_read_clock(ReplayClockKind kind, int64_t raw_icount); /*! Saves or reads the clock depending on the current replay mode. */ #define REPLAY_CLOCK(clock, value) \ + !icount_enabled() ? (value) : \ (replay_mode =3D=3D REPLAY_MODE_PLAY = \ ? replay_read_clock((clock), icount_get_raw()) \ : replay_mode =3D=3D REPLAY_MODE_RECORD = \ ? replay_save_clock((clock), (value), icount_get_raw()) \ : (value)) #define REPLAY_CLOCK_LOCKED(clock, value) \ + !icount_enabled() ? (value) : \ (replay_mode =3D=3D REPLAY_MODE_PLAY = \ ? replay_read_clock((clock), icount_get_raw_locked()) \ : replay_mode =3D=3D REPLAY_MODE_RECORD = \ diff --git a/stubs/icount.c b/stubs/icount.c index b060b03a73..9a29084ecc 100644 --- a/stubs/icount.c +++ b/stubs/icount.c @@ -5,30 +5,11 @@ =20 ICountMode use_icount =3D ICOUNT_DISABLED; =20 -void icount_update(CPUState *cpu) -{ - abort(); -} int64_t icount_get_raw(void) { abort(); return 0; } -int64_t icount_get(void) -{ - abort(); - return 0; -} -int64_t icount_to_ns(int64_t icount) -{ - abort(); - return 0; -} -int64_t icount_round(int64_t count) -{ - abort(); - return 0; -} void icount_start_warp_timer(void) { abort(); --=20 2.41.0