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(93-143-182-244.adsl.net.t-com.hr. [93.143.182.244]) by smtp.googlemail.com with ESMTPSA id a640c23a62f3a-b9c3cac0e1asm134009166b.27.2026.04.02.14.57.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Apr 2026 14:57:34 -0700 (PDT) From: Ruslan Ruslichenko To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, alex.bennee@linaro.org, peter.maydell@linaro.org, artem_mygaiev@epam.com, volodymyr_babchuk@epam.com, takahiro.nakata.wr@renesas.com, "Edgar E . Iglesias" , Ruslan_Ruslichenko@epam.com, balaton@eik.bme.hu Subject: [PATCH v3 30/33] hw/core/fdt_generic_util: Add deferred device initialization support Date: Thu, 2 Apr 2026 23:56:15 +0200 Message-ID: <20260402215629.745866-31-ruslichenko.r@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260402215629.745866-1-ruslichenko.r@gmail.com> References: <20260402215629.745866-1-ruslichenko.r@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::62b; envelope-from=ruslichenko.r@gmail.com; helo=mail-ej1-x62b.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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@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-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org From: Ruslan Ruslichenko Add a mechanism to defer device initialization until after the main FDT traversal. This introduces a deferred queue in FDTMachineInfo. Devices in this queue are processed in fdt_init_deferred(), which handles their realization, reset registration, and resource parsing (interrupts and memory regions). This allows resolving initialization where devices need to be realized on latest stages or outside of co-routine context. Signed-off-by: Ruslan Ruslichenko --- hw/core/fdt_generic_util.c | 28 ++++++++++++++++++++++++++++ include/hw/core/fdt_generic.h | 8 ++++++++ 2 files changed, 36 insertions(+) diff --git a/hw/core/fdt_generic_util.c b/hw/core/fdt_generic_util.c index c92b5c287b..ae54ada11d 100644 --- a/hw/core/fdt_generic_util.c +++ b/hw/core/fdt_generic_util.c @@ -93,6 +93,13 @@ static bool qemu_irq_shared_or_handler(bool *inputs, int n) return false; } +static void fdt_parse_node_reg_prop(FDTMachineInfo *fdti, char *node_path, + Object *dev); +static void fdt_parse_node_irq_prop(FDTMachineInfo *fdti, char *node_path, + Object *dev); +static void fdt_init_device_realize(FDTMachineInfo *fdti, char *node_path, + Object *dev); + static void qemu_irq_shared_handler(void *opaque, int n, int level) { QEMUIRQSharedState *s = opaque; @@ -162,6 +169,26 @@ static void fdt_init_cpu_clusters(FDTMachineInfo *fdti) } } +static void fdt_init_deferred(FDTMachineInfo *fdti) +{ + while (fdti->deferred) { + FDTDeferredNode *dnode = fdti->deferred; + + fdt_debug("FDT: Deferred realize node: %s\n", + dnode->node_path); + + fdt_init_device_realize(fdti, dnode->node_path, OBJECT(dnode->dev)); + + fdt_parse_node_reg_prop(fdti, dnode->node_path, OBJECT(dnode->dev)); + + fdt_parse_node_irq_prop(fdti, dnode->node_path, OBJECT(dnode->dev)); + + fdti->deferred = dnode->next; + g_free(dnode->node_path); + g_free(dnode); + } +} + FDTMachineInfo *fdt_generic_create_machine(void *fdt, qemu_irq *cpu_irq) { FDTMachineInfo *fdti = fdt_init_new_fdti(fdt); @@ -175,6 +202,7 @@ FDTMachineInfo *fdt_generic_create_machine(void *fdt, qemu_irq *cpu_irq) while (qemu_co_enter_next(fdti->cq, NULL)) { ; } + fdt_init_deferred(fdti); fdt_init_cpu_clusters(fdti); fdt_init_all_irqs(fdti); memory_region_transaction_commit(); diff --git a/include/hw/core/fdt_generic.h b/include/hw/core/fdt_generic.h index 3961615a9c..2d507392fa 100644 --- a/include/hw/core/fdt_generic.h +++ b/include/hw/core/fdt_generic.h @@ -35,6 +35,12 @@ typedef struct FDTIRQConnection { void *next; } FDTIRQConnection; +typedef struct FDTDeferredNode { + DeviceState *dev; + char *node_path; + void *next; +} FDTDeferredNode; + typedef struct FDTMachineInfo { /* the fdt blob */ void *fdt; @@ -48,6 +54,8 @@ typedef struct FDTMachineInfo { FDTIRQConnection *irqs; /* list of all CPU clusters */ FDTCPUCluster *clusters; + /* list of devices for deferred init */ + FDTDeferredNode *deferred; } FDTMachineInfo; /* -- 2.43.0