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Fri, 22 Apr 2022 09:39:09 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyVl6OBjtBqNNBa38oNcAKzj/du8K4ETh5PMsAFOKUpylWL6wt7pz/5z+9ceF7rruXaCdlgIg== X-Received: by 2002:a1c:ac44:0:b0:38e:a7df:3179 with SMTP id v65-20020a1cac44000000b0038ea7df3179mr5054476wme.61.1650645548806; Fri, 22 Apr 2022 09:39:08 -0700 (PDT) From: Nicolas Saenz Julienne To: kwolf@redhat.com, stefanha@redhat.com, berrange@redhat.com Subject: [PATCH v5 1/3] Introduce event-loop-base abstract class Date: Fri, 22 Apr 2022 18:38:55 +0200 Message-Id: <20220422163857.703111-2-nsaenzju@redhat.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220422163857.703111-1-nsaenzju@redhat.com> References: <20220422163857.703111-1-nsaenzju@redhat.com> MIME-Version: 1.0 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=170.10.129.124; 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charset="utf-8" Introduce the 'event-loop-base' abstract class, it'll hold the properties common to all event loops and provide the necessary hooks for their creation and maintenance. Then have iothread inherit from it. EventLoopBaseClass is defined as user creatable and provides a hook for its children to attach themselves to the user creatable class 'complete' function. It also provides an update_params() callback to propagate property changes onto its children. The new 'event-loop-base' class will live in the root directory. It is built on its own using the 'link_whole' option (there are no direct function dependencies between the class and its children, it all happens trough 'constructor' magic). And also imposes new compilation dependencies: qom <- event-loop-base <- blockdev (iothread.c) And in subsequent patches: qom <- event-loop-base <- qemuutil (util/main-loop.c) All this forced some amount of reordering in meson.build: - Moved qom build definition before qemuutil. Doing it the other way around (i.e. moving qemuutil after qom) isn't possible as a lot of core libraries that live in between the two depend on it. - Process the 'hw' subdir earlier, as it introduces files into the 'qom' source set. No functional changes intended. Signed-off-by: Nicolas Saenz Julienne Reviewed-by: Stefan Hajnoczi --- Changes since v4: - Introduce relevant qom.json changes, lived previously in patch #2 - Rework EventLoopBaseProperties' description Changes since v3: - Fix event-loop-base compilation so it depends on qapi header generation. Changes since v2: - reword commit message to better explain compilation dependencies. Changes since v1: - Rename to event-loop-base - Move event-loop-base into root directory - Build event-loop-base on its own, use link_whole to avoid the problem of the object file not being linked due to lacking direct calls from dependencies. - Move poll parameters into iothread, as main loop can't poll - Update Authorship (I took what iothread.c had and added myself, I hope that's fine) - Introduce update_params() callback event-loop-base.c | 104 +++++++++++++++++++++++++++++++ include/sysemu/event-loop-base.h | 36 +++++++++++ include/sysemu/iothread.h | 6 +- iothread.c | 65 ++++++------------- meson.build | 23 ++++--- qapi/qom.json | 22 +++++-- 6 files changed, 192 insertions(+), 64 deletions(-) create mode 100644 event-loop-base.c create mode 100644 include/sysemu/event-loop-base.h diff --git a/event-loop-base.c b/event-loop-base.c new file mode 100644 index 0000000000..a924c73a7c --- /dev/null +++ b/event-loop-base.c @@ -0,0 +1,104 @@ +/* + * QEMU event-loop base + * + * Copyright (C) 2022 Red Hat Inc + * + * Authors: + * Stefan Hajnoczi + * Nicolas Saenz Julienne + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "qom/object_interfaces.h" +#include "qapi/error.h" +#include "sysemu/event-loop-base.h" + +typedef struct { + const char *name; + ptrdiff_t offset; /* field's byte offset in EventLoopBase struct */ +} EventLoopBaseParamInfo; + +static EventLoopBaseParamInfo aio_max_batch_info =3D { + "aio-max-batch", offsetof(EventLoopBase, aio_max_batch), +}; + +static void event_loop_base_get_param(Object *obj, Visitor *v, + const char *name, void *opaque, Error **errp) +{ + EventLoopBase *event_loop_base =3D EVENT_LOOP_BASE(obj); + EventLoopBaseParamInfo *info =3D opaque; + int64_t *field =3D (void *)event_loop_base + info->offset; + + visit_type_int64(v, name, field, errp); +} + +static void event_loop_base_set_param(Object *obj, Visitor *v, + const char *name, void *opaque, Error **errp) +{ + EventLoopBaseClass *bc =3D EVENT_LOOP_BASE_GET_CLASS(obj); + EventLoopBase *base =3D EVENT_LOOP_BASE(obj); + EventLoopBaseParamInfo *info =3D opaque; + int64_t *field =3D (void *)base + info->offset; + int64_t value; + + if (!visit_type_int64(v, name, &value, errp)) { + return; + } + + if (value < 0) { + error_setg(errp, "%s value must be in range [0, %" PRId64 "]", + info->name, INT64_MAX); + return; + } + + *field =3D value; + + if (bc->update_params) { + bc->update_params(base, errp); + } + + return; +} + +static void event_loop_base_complete(UserCreatable *uc, Error **errp) +{ + EventLoopBaseClass *bc =3D EVENT_LOOP_BASE_GET_CLASS(uc); + EventLoopBase *base =3D EVENT_LOOP_BASE(uc); + + if (bc->init) { + bc->init(base, errp); + } +} + +static void event_loop_base_class_init(ObjectClass *klass, void *class_dat= a) +{ + UserCreatableClass *ucc =3D USER_CREATABLE_CLASS(klass); + ucc->complete =3D event_loop_base_complete; + + object_class_property_add(klass, "aio-max-batch", "int", + event_loop_base_get_param, + event_loop_base_set_param, + NULL, &aio_max_batch_info); +} + +static const TypeInfo event_loop_base_info =3D { + .name =3D TYPE_EVENT_LOOP_BASE, + .parent =3D TYPE_OBJECT, + .instance_size =3D sizeof(EventLoopBase), + .class_size =3D sizeof(EventLoopBaseClass), + .class_init =3D event_loop_base_class_init, + .abstract =3D true, + .interfaces =3D (InterfaceInfo[]) { + { TYPE_USER_CREATABLE }, + { } + } +}; + +static void register_types(void) +{ + type_register_static(&event_loop_base_info); +} +type_init(register_types); diff --git a/include/sysemu/event-loop-base.h b/include/sysemu/event-loop-b= ase.h new file mode 100644 index 0000000000..8e77d8b69f --- /dev/null +++ b/include/sysemu/event-loop-base.h @@ -0,0 +1,36 @@ +/* + * QEMU event-loop backend + * + * Copyright (C) 2022 Red Hat Inc + * + * Authors: + * Nicolas Saenz Julienne + * + * This work is licensed under the terms of the GNU GPL, version 2 or late= r. + * See the COPYING file in the top-level directory. + */ +#ifndef QEMU_EVENT_LOOP_BASE_H +#define QEMU_EVENT_LOOP_BASE_H + +#include "qom/object.h" +#include "block/aio.h" +#include "qemu/typedefs.h" + +#define TYPE_EVENT_LOOP_BASE "event-loop-base" +OBJECT_DECLARE_TYPE(EventLoopBase, EventLoopBaseClass, + EVENT_LOOP_BASE) + +struct EventLoopBaseClass { + ObjectClass parent_class; + + void (*init)(EventLoopBase *base, Error **errp); + void (*update_params)(EventLoopBase *base, Error **errp); +}; + +struct EventLoopBase { + Object parent; + + /* AioContext AIO engine parameters */ + int64_t aio_max_batch; +}; +#endif diff --git a/include/sysemu/iothread.h b/include/sysemu/iothread.h index 7f714bd136..8f8601d6ab 100644 --- a/include/sysemu/iothread.h +++ b/include/sysemu/iothread.h @@ -17,11 +17,12 @@ #include "block/aio.h" #include "qemu/thread.h" #include "qom/object.h" +#include "sysemu/event-loop-base.h" =20 #define TYPE_IOTHREAD "iothread" =20 struct IOThread { - Object parent_obj; + EventLoopBase parent_obj; =20 QemuThread thread; AioContext *ctx; @@ -37,9 +38,6 @@ struct IOThread { int64_t poll_max_ns; int64_t poll_grow; int64_t poll_shrink; - - /* AioContext AIO engine parameters */ - int64_t aio_max_batch; }; typedef struct IOThread IOThread; =20 diff --git a/iothread.c b/iothread.c index 0f98af0f2a..8fa2f3bfb8 100644 --- a/iothread.c +++ b/iothread.c @@ -17,6 +17,7 @@ #include "qemu/module.h" #include "block/aio.h" #include "block/block.h" +#include "sysemu/event-loop-base.h" #include "sysemu/iothread.h" #include "qapi/error.h" #include "qapi/qapi-commands-misc.h" @@ -152,10 +153,15 @@ static void iothread_init_gcontext(IOThread *iothread) iothread->main_loop =3D g_main_loop_new(iothread->worker_context, TRUE= ); } =20 -static void iothread_set_aio_context_params(IOThread *iothread, Error **er= rp) +static void iothread_set_aio_context_params(EventLoopBase *base, Error **e= rrp) { + IOThread *iothread =3D IOTHREAD(base); ERRP_GUARD(); =20 + if (!iothread->ctx) { + return; + } + aio_context_set_poll_params(iothread->ctx, iothread->poll_max_ns, iothread->poll_grow, @@ -166,14 +172,15 @@ static void iothread_set_aio_context_params(IOThread = *iothread, Error **errp) } =20 aio_context_set_aio_params(iothread->ctx, - iothread->aio_max_batch, + iothread->parent_obj.aio_max_batch, errp); } =20 -static void iothread_complete(UserCreatable *obj, Error **errp) + +static void iothread_init(EventLoopBase *base, Error **errp) { Error *local_error =3D NULL; - IOThread *iothread =3D IOTHREAD(obj); + IOThread *iothread =3D IOTHREAD(base); char *thread_name; =20 iothread->stopping =3D false; @@ -189,7 +196,7 @@ static void iothread_complete(UserCreatable *obj, Error= **errp) */ iothread_init_gcontext(iothread); =20 - iothread_set_aio_context_params(iothread, &local_error); + iothread_set_aio_context_params(base, &local_error); if (local_error) { error_propagate(errp, local_error); aio_context_unref(iothread->ctx); @@ -201,7 +208,7 @@ static void iothread_complete(UserCreatable *obj, Error= **errp) * to inherit. */ thread_name =3D g_strdup_printf("IO %s", - object_get_canonical_path_component(OBJECT(obj))); + object_get_canonical_path_component(OBJECT(base))); qemu_thread_create(&iothread->thread, thread_name, iothread_run, iothread, QEMU_THREAD_JOINABLE); g_free(thread_name); @@ -226,9 +233,6 @@ static IOThreadParamInfo poll_grow_info =3D { static IOThreadParamInfo poll_shrink_info =3D { "poll-shrink", offsetof(IOThread, poll_shrink), }; -static IOThreadParamInfo aio_max_batch_info =3D { - "aio-max-batch", offsetof(IOThread, aio_max_batch), -}; =20 static void iothread_get_param(Object *obj, Visitor *v, const char *name, IOThreadParamInfo *info, Error **errp) @@ -288,35 +292,12 @@ static void iothread_set_poll_param(Object *obj, Visi= tor *v, } } =20 -static void iothread_get_aio_param(Object *obj, Visitor *v, - const char *name, void *opaque, Error **errp) -{ - IOThreadParamInfo *info =3D opaque; - - iothread_get_param(obj, v, name, info, errp); -} - -static void iothread_set_aio_param(Object *obj, Visitor *v, - const char *name, void *opaque, Error **errp) -{ - IOThread *iothread =3D IOTHREAD(obj); - IOThreadParamInfo *info =3D opaque; - - if (!iothread_set_param(obj, v, name, info, errp)) { - return; - } - - if (iothread->ctx) { - aio_context_set_aio_params(iothread->ctx, - iothread->aio_max_batch, - errp); - } -} - static void iothread_class_init(ObjectClass *klass, void *class_data) { - UserCreatableClass *ucc =3D USER_CREATABLE_CLASS(klass); - ucc->complete =3D iothread_complete; + EventLoopBaseClass *bc =3D EVENT_LOOP_BASE_CLASS(klass); + + bc->init =3D iothread_init; + bc->update_params =3D iothread_set_aio_context_params; =20 object_class_property_add(klass, "poll-max-ns", "int", iothread_get_poll_param, @@ -330,23 +311,15 @@ static void iothread_class_init(ObjectClass *klass, v= oid *class_data) iothread_get_poll_param, iothread_set_poll_param, NULL, &poll_shrink_info); - object_class_property_add(klass, "aio-max-batch", "int", - iothread_get_aio_param, - iothread_set_aio_param, - NULL, &aio_max_batch_info); } =20 static const TypeInfo iothread_info =3D { .name =3D TYPE_IOTHREAD, - .parent =3D TYPE_OBJECT, + .parent =3D TYPE_EVENT_LOOP_BASE, .class_init =3D iothread_class_init, .instance_size =3D sizeof(IOThread), .instance_init =3D iothread_instance_init, .instance_finalize =3D iothread_instance_finalize, - .interfaces =3D (InterfaceInfo[]) { - {TYPE_USER_CREATABLE}, - {} - }, }; =20 static void iothread_register_types(void) @@ -383,7 +356,7 @@ static int query_one_iothread(Object *object, void *opa= que) info->poll_max_ns =3D iothread->poll_max_ns; info->poll_grow =3D iothread->poll_grow; info->poll_shrink =3D iothread->poll_shrink; - info->aio_max_batch =3D iothread->aio_max_batch; + info->aio_max_batch =3D iothread->parent_obj.aio_max_batch; =20 QAPI_LIST_APPEND(*tail, info); return 0; diff --git a/meson.build b/meson.build index d083c6b7bf..0a14e88ffc 100644 --- a/meson.build +++ b/meson.build @@ -2795,6 +2795,7 @@ subdir('qom') subdir('authz') subdir('crypto') subdir('ui') +subdir('hw') =20 =20 if enable_modules @@ -2802,6 +2803,18 @@ if enable_modules modulecommon =3D declare_dependency(link_whole: libmodulecommon, compile= _args: '-DBUILD_DSO') endif =20 +qom_ss =3D qom_ss.apply(config_host, strict: false) +libqom =3D static_library('qom', qom_ss.sources() + genh, + dependencies: [qom_ss.dependencies()], + name_suffix: 'fa') +qom =3D declare_dependency(link_whole: libqom) + +event_loop_base =3D files('event-loop-base.c') +event_loop_base =3D static_library('event-loop-base', sources: event_loop_= base + genh, + build_by_default: true) +event_loop_base =3D declare_dependency(link_whole: event_loop_base, + dependencies: [qom]) + stub_ss =3D stub_ss.apply(config_all, strict: false) =20 util_ss.add_all(trace_ss) @@ -2888,7 +2901,6 @@ subdir('monitor') subdir('net') subdir('replay') subdir('semihosting') -subdir('hw') subdir('tcg') subdir('fpu') subdir('accel') @@ -3013,13 +3025,6 @@ qemu_syms =3D custom_target('qemu.syms', output: 'qe= mu.syms', capture: true, command: [undefsym, nm, '@INPUT@']) =20 -qom_ss =3D qom_ss.apply(config_host, strict: false) -libqom =3D static_library('qom', qom_ss.sources() + genh, - dependencies: [qom_ss.dependencies()], - name_suffix: 'fa') - -qom =3D declare_dependency(link_whole: libqom) - authz_ss =3D authz_ss.apply(config_host, strict: false) libauthz =3D static_library('authz', authz_ss.sources() + genh, dependencies: [authz_ss.dependencies()], @@ -3072,7 +3077,7 @@ libblockdev =3D static_library('blockdev', blockdev_s= s.sources() + genh, build_by_default: false) =20 blockdev =3D declare_dependency(link_whole: [libblockdev], - dependencies: [block]) + dependencies: [block, event_loop_base]) =20 qmp_ss =3D qmp_ss.apply(config_host, strict: false) libqmp =3D static_library('qmp', qmp_ss.sources() + genh, diff --git a/qapi/qom.json b/qapi/qom.json index eeb5395ff3..a2439533c5 100644 --- a/qapi/qom.json +++ b/qapi/qom.json @@ -499,6 +499,20 @@ '*repeat': 'bool', '*grab-toggle': 'GrabToggleKeys' } } =20 +## +# @EventLoopBaseProperties: +# +# Common properties for event loops +# +# @aio-max-batch: maximum number of requests in a batch for the AIO engine, +# 0 means that the engine will use its default. +# (default: 0) +# +# Since: 7.1 +## +{ 'struct': 'EventLoopBaseProperties', + 'data': { '*aio-max-batch': 'int' } } + ## # @IothreadProperties: # @@ -516,17 +530,15 @@ # algorithm detects it is spending too long polling without # encountering events. 0 selects a default behaviour (defaul= t: 0) # -# @aio-max-batch: maximum number of requests in a batch for the AIO engine, -# 0 means that the engine will use its default -# (default:0, since 6.1) +# The @aio-max-batch option is available since 6.1. # # Since: 2.0 ## { 'struct': 'IothreadProperties', + 'base': 'EventLoopBaseProperties', 'data': { '*poll-max-ns': 'int', '*poll-grow': 'int', - '*poll-shrink': 'int', - '*aio-max-batch': 'int' } } + '*poll-shrink': 'int' } } =20 ## # @MemoryBackendProperties: --=20 2.35.1