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Tsirkin" , Jason Wang , Alex Williamson , Igor Mammedov , peterx@redhat.com Subject: [PATCH 2/4] reset: Allow multiple stages of system resets Date: Wed, 17 Jan 2024 17:15:57 +0800 Message-ID: <20240117091559.144730-3-peterx@redhat.com> In-Reply-To: <20240117091559.144730-1-peterx@redhat.com> References: <20240117091559.144730-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 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=170.10.133.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -38 X-Spam_score: -3.9 X-Spam_bar: --- X-Spam_report: (-3.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.806, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, 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 @redhat.com) X-ZM-MESSAGEID: 1705483021148100005 Content-Type: text/plain; charset="utf-8" From: Peter Xu QEMU resets do not have a way to order reset hooks. Add one coarse grained reset stage so that some devices can be reset later than some others. Signed-off-by: Peter Xu --- include/sysemu/reset.h | 5 ++++ hw/core/reset.c | 60 +++++++++++++++++++++++++++++++----------- 2 files changed, 49 insertions(+), 16 deletions(-) diff --git a/include/sysemu/reset.h b/include/sysemu/reset.h index 609e4d50c2..0de697ce9f 100644 --- a/include/sysemu/reset.h +++ b/include/sysemu/reset.h @@ -5,9 +5,14 @@ =20 typedef void QEMUResetHandler(void *opaque); =20 +#define QEMU_RESET_STAGES_N 2 + void qemu_register_reset(QEMUResetHandler *func, void *opaque); +void qemu_register_reset_one(QEMUResetHandler *func, void *opaque, + bool skip_snap, int stage); void qemu_register_reset_nosnapshotload(QEMUResetHandler *func, void *opaq= ue); void qemu_unregister_reset(QEMUResetHandler *func, void *opaque); +void qemu_unregister_reset_one(QEMUResetHandler *func, void *opaque, int s= tage); void qemu_devices_reset(ShutdownCause reason); =20 #endif diff --git a/hw/core/reset.c b/hw/core/reset.c index 8cf60b2b09..a84c9bee84 100644 --- a/hw/core/reset.c +++ b/hw/core/reset.c @@ -36,55 +36,83 @@ typedef struct QEMUResetEntry { bool skip_on_snapshot_load; } QEMUResetEntry; =20 -static QTAILQ_HEAD(, QEMUResetEntry) reset_handlers =3D - QTAILQ_HEAD_INITIALIZER(reset_handlers); +typedef QTAILQ_HEAD(QEMUResetList, QEMUResetEntry) QEMUResetList; +static QEMUResetList reset_handlers[QEMU_RESET_STAGES_N]; =20 -static void qemu_register_reset_one(QEMUResetHandler *func, void *opaque, - bool skip_snap) +static void __attribute__((__constructor__)) qemu_reset_handlers_init(void) +{ + QEMUResetList *head; + int i =3D 0; + + for (i =3D 0; i < QEMU_RESET_STAGES_N; i++) { + head =3D &reset_handlers[i]; + QTAILQ_INIT(head); + } +} + +void qemu_register_reset_one(QEMUResetHandler *func, void *opaque, + bool skip_snap, int stage) { QEMUResetEntry *re =3D g_new0(QEMUResetEntry, 1); + QEMUResetList *head; + + assert(stage >=3D 0 && stage < QEMU_RESET_STAGES_N); + head =3D &reset_handlers[stage]; =20 re->func =3D func; re->opaque =3D opaque; re->skip_on_snapshot_load =3D skip_snap; - QTAILQ_INSERT_TAIL(&reset_handlers, re, entry); + QTAILQ_INSERT_TAIL(head, re, entry); } =20 void qemu_register_reset(QEMUResetHandler *func, void *opaque) { - /* By default, do not skip during load of a snapshot */ - qemu_register_reset_one(func, opaque, false); + qemu_register_reset_one(func, opaque, false, 0); } =20 void qemu_register_reset_nosnapshotload(QEMUResetHandler *func, void *opaq= ue) { - qemu_register_reset_one(func, opaque, true); + qemu_register_reset_one(func, opaque, true, 0); } =20 -void qemu_unregister_reset(QEMUResetHandler *func, void *opaque) +void qemu_unregister_reset_one(QEMUResetHandler *func, void *opaque, int s= tage) { + QEMUResetList *head; QEMUResetEntry *re; =20 - QTAILQ_FOREACH(re, &reset_handlers, entry) { + assert(stage >=3D 0 && stage < QEMU_RESET_STAGES_N); + head =3D &reset_handlers[stage]; + + QTAILQ_FOREACH(re, head, entry) { if (re->func =3D=3D func && re->opaque =3D=3D opaque) { - QTAILQ_REMOVE(&reset_handlers, re, entry); + QTAILQ_REMOVE(head, re, entry); g_free(re); return; } } } =20 +void qemu_unregister_reset(QEMUResetHandler *func, void *opaque) +{ + qemu_unregister_reset_one(func, opaque, 0); +} + void qemu_devices_reset(ShutdownCause reason) { QEMUResetEntry *re, *nre; + QEMUResetList *head; + int stage; =20 /* reset all devices */ - QTAILQ_FOREACH_SAFE(re, &reset_handlers, entry, nre) { - if (reason =3D=3D SHUTDOWN_CAUSE_SNAPSHOT_LOAD && - re->skip_on_snapshot_load) { - continue; + for (stage =3D 0; stage < QEMU_RESET_STAGES_N; stage++) { + head =3D &reset_handlers[stage]; + QTAILQ_FOREACH_SAFE(re, head, entry, nre) { + if (reason =3D=3D SHUTDOWN_CAUSE_SNAPSHOT_LOAD && + re->skip_on_snapshot_load) { + continue; + } + re->func(re->opaque); } - re->func(re->opaque); } } =20 --=20 2.43.0