{"id":2198222,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2198222/?format=json","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/1.0/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260219144901.3317747-12-ruslichenko.r@gmail.com>","date":"2026-02-19T14:48:58","name":"[v2,30/33] hw/core/fdt_generic_util: Add deferred device initialization support","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"54f82649ba17e897942ab7859e890b1d3e0ece31","submitter":{"id":92275,"url":"http://patchwork.ozlabs.org/api/1.0/people/92275/?format=json","name":"Ruslan Ruslichenko","email":"ruslichenko.r@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260219144901.3317747-12-ruslichenko.r@gmail.com/mbox/","series":[{"id":492690,"url":"http://patchwork.ozlabs.org/api/1.0/series/492690/?format=json","date":"2026-02-19T14:33:04","name":"hw/arm: Introduce generic FDT-driven machine","version":2,"mbox":"http://patchwork.ozlabs.org/series/492690/mbox/"}],"check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2198222/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20230601 header.b=amoPnJPX;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists.gnu.org (lists.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fGxF351NBz1xpl\n\tfor ; Fri, 20 Feb 2026 01:52:39 +1100 (AEDT)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1vt5MR-000473-CJ; Thu, 19 Feb 2026 09:50:35 -0500","from eggs.gnu.org ([2001:470:142:3::10])\n by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from )\n id 1vt5M5-0003mN-Qa\n for qemu-devel@nongnu.org; Thu, 19 Feb 2026 09:50:20 -0500","from mail-wr1-x42d.google.com ([2a00:1450:4864:20::42d])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)\n (Exim 4.90_1) (envelope-from )\n id 1vt5Lx-00085v-Qz\n for qemu-devel@nongnu.org; Thu, 19 Feb 2026 09:50:10 -0500","by mail-wr1-x42d.google.com with SMTP id\n ffacd0b85a97d-4359a302794so847448f8f.1\n for ; Thu, 19 Feb 2026 06:49:57 -0800 (PST)","from thinkpad-t470s.. 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Iglesias\" ,\n Ruslan_Ruslichenko@epam.com, balaton@eik.bme.hu","Subject":"[PATCH v2 30/33] hw/core/fdt_generic_util: Add deferred device\n initialization support","Date":"Thu, 19 Feb 2026 15:48:58 +0100","Message-ID":"<20260219144901.3317747-12-ruslichenko.r@gmail.com>","X-Mailer":"git-send-email 2.43.0","In-Reply-To":"<20260219144901.3317747-1-ruslichenko.r@gmail.com>","References":"<20260219143332.3316679-1-ruslichenko.r@gmail.com>\n <20260219144901.3317747-1-ruslichenko.r@gmail.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Received-SPF":"pass client-ip=2a00:1450:4864:20::42d;\n envelope-from=ruslichenko.r@gmail.com; helo=mail-wr1-x42d.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,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 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":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"From: Ruslan Ruslichenko \n\nAdd a mechanism to defer device initialization\nuntil after the main FDT traversal.\n\nThis introduces a deferred queue in FDTMachineInfo.\nDevices in this queue are processed in fdt_init_deferred(),\nwhich handles their realization, reset registration,\nand resource parsing (interrupts and memory regions).\n\nThis allows resolving initialization where devices need to\nbe realized on latest stages or outside of co-routine context.\n\nSigned-off-by: Ruslan Ruslichenko \n---\n hw/core/fdt_generic_util.c | 45 +++++++++++++++++++++++++++++++++++\n include/hw/core/fdt_generic.h | 8 +++++++\n 2 files changed, 53 insertions(+)","diff":"diff --git a/hw/core/fdt_generic_util.c b/hw/core/fdt_generic_util.c\nindex c58a9ccdc7..4ed9602d47 100644\n--- a/hw/core/fdt_generic_util.c\n+++ b/hw/core/fdt_generic_util.c\n@@ -99,6 +99,11 @@ static bool qemu_irq_shared_or_handler(bool *inputs, int n)\n return false;\n }\n \n+static void fdt_parse_node_reg_prop(FDTMachineInfo *fdti, char *node_path,\n+ Object *dev);\n+static void fdt_parse_node_irq_prop(FDTMachineInfo *fdti, char *node_path,\n+ Object *dev);\n+\n static void qemu_irq_shared_handler(void *opaque, int n, int level)\n {\n QEMUIRQSharedState *s = opaque;\n@@ -168,6 +173,45 @@ static void fdt_init_cpu_clusters(FDTMachineInfo *fdti)\n }\n }\n \n+static void fdt_init_deferred(FDTMachineInfo *fdti)\n+{\n+ while (fdti->deferred) {\n+ FDTDeferredNode *dnode = fdti->deferred;\n+ DeviceClass *dc = DEVICE_GET_CLASS(dnode->dev);\n+ int length = 0;\n+\n+ int offset = fdt_path_offset(fdti->fdt, dnode->node_path);\n+ if (offset < 0) {\n+ error_report(\"%s Couldn't find node %s: %s\", __func__,\n+ dnode->node_path, fdt_strerror(offset));\n+ }\n+ const char *blockdev = fdt_stringlist_get(fdti->fdt, offset,\n+ \"blockdev-node-name\", 0, &length);\n+\n+ DB_PRINT(0, \"FDT: Deferred realize node: %s\\n\",\n+ dnode->node_path);\n+\n+ if (blockdev && object_property_find(OBJECT(dnode->dev), \"drive\")) {\n+ fdt_attach_blockdev(fdti, dnode->node_path, OBJECT(dnode->dev));\n+ }\n+\n+ object_property_set_bool(OBJECT(dnode->dev), \"realized\", true,\n+ &error_fatal);\n+ if (dc->legacy_reset) {\n+ qemu_register_reset((void (*)(void *))dc->legacy_reset,\n+ dnode->dev);\n+ }\n+\n+ fdt_parse_node_reg_prop(fdti, dnode->node_path, OBJECT(dnode->dev));\n+\n+ fdt_parse_node_irq_prop(fdti, dnode->node_path, OBJECT(dnode->dev));\n+\n+ fdti->deferred = dnode->next;\n+ g_free(dnode->node_path);\n+ g_free(dnode);\n+ }\n+}\n+\n FDTMachineInfo *fdt_generic_create_machine(void *fdt, qemu_irq *cpu_irq)\n {\n char node_path[DT_PATH_LENGTH];\n@@ -183,6 +227,7 @@ FDTMachineInfo *fdt_generic_create_machine(void *fdt, qemu_irq *cpu_irq)\n while (qemu_co_enter_next(fdti->cq, NULL)) {\n ;\n }\n+ fdt_init_deferred(fdti);\n fdt_init_cpu_clusters(fdti);\n fdt_init_all_irqs(fdti);\n memory_region_transaction_commit();\ndiff --git a/include/hw/core/fdt_generic.h b/include/hw/core/fdt_generic.h\nindex ad9e249156..dc2d7a8876 100644\n--- a/include/hw/core/fdt_generic.h\n+++ b/include/hw/core/fdt_generic.h\n@@ -34,6 +34,12 @@ typedef struct FDTIRQConnection {\n void *next;\n } FDTIRQConnection;\n \n+typedef struct FDTDeferredNode {\n+ DeviceState *dev;\n+ char *node_path;\n+ void *next;\n+} FDTDeferredNode;\n+\n typedef struct FDTMachineInfo {\n /* the fdt blob */\n void *fdt;\n@@ -47,6 +53,8 @@ typedef struct FDTMachineInfo {\n FDTIRQConnection *irqs;\n /* list of all CPU clusters */\n FDTCPUCluster *clusters;\n+ /* list of devices for deferred init */\n+ FDTDeferredNode *deferred;\n } FDTMachineInfo;\n \n /*\n","prefixes":["v2","30/33"]}