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Wed, 29 Oct 2025 08:50:53 -0700 (PDT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: Julian Ganz , Pierrick Bouvier , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Alexandre Iooss , Mahmoud Mandour Subject: [PULL 10/35] contrib/plugins: add plugin showcasing new dicontinuity related API Date: Wed, 29 Oct 2025 15:50:19 +0000 Message-ID: <20251029155045.257802-11-alex.bennee@linaro.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251029155045.257802-1-alex.bennee@linaro.org> References: <20251029155045.257802-1-alex.bennee@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::630; envelope-from=alex.bennee@linaro.org; helo=mail-ej1-x630.google.com X-Spam_score_int: -7 X-Spam_score: -0.8 X-Spam_bar: / X-Spam_report: (-0.8 / 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, NEW_PRODUCTS=1.249, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, T_SPF_TEMPERROR=0.01 autolearn=no 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: 1761753438016158500 From: Julian Ganz We recently introduced new plugin API for registration of discontinuity related callbacks. This change introduces a minimal plugin showcasing the new API. It simply counts the occurances of interrupts, exceptions and host calls per CPU and reports the counts when exitting. Reviewed-by: Pierrick Bouvier Reviewed-by: Alex Benn=C3=A9e Signed-off-by: Julian Ganz Message-ID: <20251027110344.2289945-11-alex.bennee@linaro.org> Signed-off-by: Alex Benn=C3=A9e diff --git a/docs/about/emulation.rst b/docs/about/emulation.rst index 8a5e128f677..92c219119e8 100644 --- a/docs/about/emulation.rst +++ b/docs/about/emulation.rst @@ -1015,6 +1015,14 @@ interesting to generate them around a particular poi= nt of execution:: # generate trace around init execution (2 seconds): $ uftrace dump --chrome --time-range=3D1753122320~1753122322 > init.js= on =20 +Count traps +........... + +``contrib/plugins/traps.c`` + +This plugin counts the number of interrupts (asyncronous events), exceptio= ns +(synchronous events) and host calls (e.g. semihosting) per cpu. + Other emulation features ------------------------ =20 diff --git a/contrib/plugins/traps.c b/contrib/plugins/traps.c new file mode 100644 index 00000000000..d5ddc0f3dd6 --- /dev/null +++ b/contrib/plugins/traps.c @@ -0,0 +1,83 @@ +/* + * SPDX-License-Identifier: GPL-2.0-or-later + * Copyright (C) 2025, Julian Ganz + * + * Traps - count traps + * + * Count the number of interrupts (asyncronous events), exceptions (synchr= onous + * events) and host calls (e.g. semihosting) per cpu and report those coun= ts on + * exit. + */ + +#include + +#include + +QEMU_PLUGIN_EXPORT int qemu_plugin_version =3D QEMU_PLUGIN_VERSION; + +typedef struct { + uint64_t interrupts; + uint64_t exceptions; + uint64_t hostcalls; +} TrapCounters; + +static struct qemu_plugin_scoreboard *traps; + +static void vcpu_discon(qemu_plugin_id_t id, unsigned int vcpu_index, + enum qemu_plugin_discon_type type, uint64_t from_p= c, + uint64_t to_pc) +{ + TrapCounters *rec =3D qemu_plugin_scoreboard_find(traps, vcpu_index); + switch (type) { + case QEMU_PLUGIN_DISCON_INTERRUPT: + rec->interrupts++; + break; + case QEMU_PLUGIN_DISCON_EXCEPTION: + rec->exceptions++; + break; + case QEMU_PLUGIN_DISCON_HOSTCALL: + rec->hostcalls++; + break; + default: + g_assert_not_reached(); + break; + } +} + +static void plugin_exit(qemu_plugin_id_t id, void *p) +{ + g_autoptr(GString) report; + report =3D g_string_new("VCPU, interrupts, exceptions, hostcalls\n"); + int max_vcpus =3D qemu_plugin_num_vcpus(); + int vcpu; + + for (vcpu =3D 0; vcpu < max_vcpus; vcpu++) { + TrapCounters *rec =3D qemu_plugin_scoreboard_find(traps, vcpu); + g_string_append_printf(report, + "% 4d, % 10"PRId64", % 10"PRId64", % 10"PRI= d64 + "\n", vcpu, rec->interrupts, rec->exception= s, + rec->hostcalls); + } + + qemu_plugin_outs(report->str); + qemu_plugin_scoreboard_free(traps); +} + +QEMU_PLUGIN_EXPORT +int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info, + int argc, char **argv) +{ + if (!info->system_emulation) { + qemu_plugin_outs("Note: interrupts are only reported in system" + " emulation mode."); + } + + traps =3D qemu_plugin_scoreboard_new(sizeof(TrapCounters)); + + qemu_plugin_register_vcpu_discon_cb(id, QEMU_PLUGIN_DISCON_ALL, + vcpu_discon); + + qemu_plugin_register_atexit_cb(id, plugin_exit, NULL); + + return 0; +} diff --git a/contrib/plugins/meson.build b/contrib/plugins/meson.build index 7eb3629c95d..eb944b5159a 100644 --- a/contrib/plugins/meson.build +++ b/contrib/plugins/meson.build @@ -1,6 +1,6 @@ contrib_plugins =3D ['bbv', 'cache', 'cflow', 'drcov', 'execlog', 'hotbloc= ks', 'hotpages', 'howvec', 'hwprofile', 'ips', 'stoptrigger', - 'uftrace'] + 'traps', 'uftrace'] if host_os !=3D 'windows' # lockstep uses socket.h contrib_plugins +=3D 'lockstep' --=20 2.47.3