{"id":2198203,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2198203/?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":"<20260219143332.3316679-7-ruslichenko.r@gmail.com>","date":"2026-02-19T14:33:05","name":"[v2,06/33] hw/core/fdt_generic: add cpu clusters management","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"91b01ce7eea0c0b3f37bb5d0fa61dc655a13e898","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/20260219143332.3316679-7-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/2198203/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=YOIs7cMC;\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 4fGwwb69Kgz1xpl\n\tfor ; Fri, 20 Feb 2026 01:38:23 +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 1vt57C-00006U-PW; Thu, 19 Feb 2026 09:34:50 -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 1vt57B-000059-56\n for qemu-devel@nongnu.org; Thu, 19 Feb 2026 09:34:49 -0500","from mail-wm1-x344.google.com ([2a00:1450:4864:20::344])\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 1vt579-0002xF-IR\n for qemu-devel@nongnu.org; Thu, 19 Feb 2026 09:34:48 -0500","by mail-wm1-x344.google.com with SMTP id\n 5b1f17b1804b1-48374014a77so11194055e9.3\n for ; Thu, 19 Feb 2026 06:34:47 -0800 (PST)","from thinkpad-t470s.. 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Iglesias\" ,\n Ruslan_Ruslichenko@epam.com, balaton@eik.bme.hu","Subject":"[PATCH v2 06/33] hw/core/fdt_generic: add cpu clusters management","Date":"Thu, 19 Feb 2026 15:33:05 +0100","Message-ID":"<20260219143332.3316679-7-ruslichenko.r@gmail.com>","X-Mailer":"git-send-email 2.43.0","In-Reply-To":"<20260219143332.3316679-1-ruslichenko.r@gmail.com>","References":"<20260219143332.3316679-1-ruslichenko.r@gmail.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Received-SPF":"pass client-ip=2a00:1450:4864:20::344;\n envelope-from=ruslichenko.r@gmail.com; helo=mail-wm1-x344.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=unavailable 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 support for grouping CPUs into clusters during\nFDT machine instantiation.\n\nThe clusters are automatically created if CPU parent\nis not already an existing cluster.\n\nSigned-off-by: Ruslan Ruslichenko \n---\n hw/core/fdt_generic.c | 77 +++++++++++++++++++++++++++++++++++\n include/hw/core/fdt_generic.h | 13 ++++++\n 2 files changed, 90 insertions(+)","diff":"diff --git a/hw/core/fdt_generic.c b/hw/core/fdt_generic.c\nindex b3ef0b7d0a..3c28f42491 100644\n--- a/hw/core/fdt_generic.c\n+++ b/hw/core/fdt_generic.c\n@@ -31,6 +31,7 @@\n #include \"migration/vmstate.h\"\n #include \"qemu/coroutine.h\"\n #include \"qemu/log.h\"\n+#include \"hw/cpu/cluster.h\"\n #include \"system/reset.h\"\n \n #ifndef FDT_GENERIC_ERR_DEBUG\n@@ -175,6 +176,75 @@ int fdt_init_has_opaque(FDTMachineInfo *fdti, char *node_path)\n return 0;\n }\n \n+static int get_next_cpu_cluster_id(void)\n+{\n+ static int i;\n+\n+ return i++;\n+}\n+\n+void fdt_init_register_user_cpu_cluster(FDTMachineInfo *fdti, Object *cluster)\n+{\n+ int i = get_next_cpu_cluster_id();\n+ DeviceState *dev = DEVICE(cluster);\n+ FDTCPUCluster *cl;\n+\n+ qdev_prop_set_uint32(dev, \"cluster-id\", i);\n+\n+ cl = g_new0(FDTCPUCluster, 1);\n+ cl->cpu_cluster = cluster;\n+ cl->next = fdti->clusters;\n+ cl->user = true;\n+\n+ fdti->clusters = cl;\n+\n+ DB_PRINT(0, \"%s: Registered user-defined cpu cluster with id %d\\n\",\n+ object_get_canonical_path(cluster), i);\n+}\n+\n+static void *fdt_init_add_cpu_cluster(FDTMachineInfo *fdti, char *compat)\n+{\n+ FDTCPUCluster *cl = g_malloc0(sizeof(*cl));\n+ int i = get_next_cpu_cluster_id();\n+ char *name = g_strdup_printf(\"cluster%d\", i);\n+ Object *obj;\n+\n+ obj = object_new(TYPE_CPU_CLUSTER);\n+ object_property_add_child(object_get_root(), name, OBJECT(obj));\n+ qdev_prop_set_uint32(DEVICE(obj), \"cluster-id\", i);\n+\n+ cl->cpu_type = g_strdup(compat);\n+ cl->cpu_cluster = obj;\n+ cl->next = fdti->clusters;\n+\n+ fdti->clusters = cl;\n+\n+ g_free(name);\n+\n+ return obj;\n+}\n+\n+void *fdt_init_get_cpu_cluster(FDTMachineInfo *fdti, Object *parent,\n+ char *compat)\n+{\n+ FDTCPUCluster *cl = fdti->clusters;\n+\n+ if (object_dynamic_cast(parent, TYPE_CPU_CLUSTER)) {\n+ /* The direct parent of this CPU is a CPU cluster. Use it. */\n+ return parent;\n+ }\n+\n+ while (cl) {\n+ if (!cl->user && !strcmp(compat, cl->cpu_type)) {\n+ return cl->cpu_cluster;\n+ }\n+ cl = cl->next;\n+ }\n+\n+ /* No cluster found so create and return a new one */\n+ return fdt_init_add_cpu_cluster(fdti, compat);\n+}\n+\n void *fdt_init_get_opaque(FDTMachineInfo *fdti, char *node_path)\n {\n FDTDevOpaque *dp;\n@@ -199,8 +269,15 @@ FDTMachineInfo *fdt_init_new_fdti(void *fdt)\n \n void fdt_init_destroy_fdti(FDTMachineInfo *fdti)\n {\n+ FDTCPUCluster *cl = fdti->clusters;\n FDTDevOpaque *dp;\n \n+ while (cl) {\n+ FDTCPUCluster *tmp = cl;\n+ cl = cl->next;\n+ g_free(tmp->cpu_type);\n+ g_free(tmp);\n+ }\n for (dp = fdti->dev_opaques; dp->node_path; dp++) {\n g_free(dp->node_path);\n }\ndiff --git a/include/hw/core/fdt_generic.h b/include/hw/core/fdt_generic.h\nindex a21e3c2440..46b7dc084b 100644\n--- a/include/hw/core/fdt_generic.h\n+++ b/include/hw/core/fdt_generic.h\n@@ -17,6 +17,13 @@ typedef struct FDTDevOpaque {\n void *opaque;\n } FDTDevOpaque;\n \n+typedef struct FDTCPUCluster {\n+ char *cpu_type;\n+ void *cpu_cluster;\n+ void *next;\n+ bool user;\n+} FDTCPUCluster;\n+\n typedef struct FDTMachineInfo {\n /* the fdt blob */\n void *fdt;\n@@ -26,6 +33,8 @@ typedef struct FDTMachineInfo {\n FDTDevOpaque *dev_opaques;\n /* recheck coroutine queue */\n CoQueue *cq;\n+ /* list of all CPU clusters */\n+ FDTCPUCluster *clusters;\n } FDTMachineInfo;\n \n /*\n@@ -73,6 +82,10 @@ void fdt_init_set_opaque(FDTMachineInfo *fdti, char *node_path, void *opaque);\n int fdt_init_has_opaque(FDTMachineInfo *fdti, char *node_path);\n void *fdt_init_get_opaque(FDTMachineInfo *fdti, char *node_path);\n \n+void *fdt_init_get_cpu_cluster(FDTMachineInfo *fdti, Object *parent,\n+ char *compat);\n+void fdt_init_register_user_cpu_cluster(FDTMachineInfo *fdti, Object *cluster);\n+\n /* statically register a FDTInitFn as being associate with a compatibility */\n \n #define fdt_register_compatibility_opaque(function, compat, n, opaque) \\\n","prefixes":["v2","06/33"]}