1 /* 2 * QEMU NVM Express Subsystem: nvme-subsys 3 * 4 * Copyright (c) 2021 Minwoo Im <minwoo.im.dev@gmail.com> 5 * 6 * This code is licensed under the GNU GPL v2. Refer COPYING. 7 */ 8 9 #include "qemu/osdep.h" 10 #include "qapi/error.h" 11 12 #include "nvme.h" 13 14 int nvme_subsys_register_ctrl(NvmeCtrl *n, Error **errp) 15 { 16 NvmeSubsystem *subsys = n->subsys; 17 int cntlid, nsid; 18 19 for (cntlid = 0; cntlid < ARRAY_SIZE(subsys->ctrls); cntlid++) { 20 if (!subsys->ctrls[cntlid]) { 21 break; 22 } 23 } 24 25 if (cntlid == ARRAY_SIZE(subsys->ctrls)) { 26 error_setg(errp, "no more free controller id"); 27 return -1; 28 } 29 30 subsys->ctrls[cntlid] = n; 31 32 for (nsid = 1; nsid < ARRAY_SIZE(subsys->namespaces); nsid++) { 33 NvmeNamespace *ns = subsys->namespaces[nsid]; 34 if (ns && ns->params.shared && !ns->params.detached) { 35 nvme_attach_ns(n, ns); 36 } 37 } 38 39 return cntlid; 40 } 41 42 void nvme_subsys_unregister_ctrl(NvmeSubsystem *subsys, NvmeCtrl *n) 43 { 44 subsys->ctrls[n->cntlid] = NULL; 45 n->cntlid = -1; 46 } 47 48 static void nvme_subsys_setup(NvmeSubsystem *subsys) 49 { 50 const char *nqn = subsys->params.nqn ? 51 subsys->params.nqn : subsys->parent_obj.id; 52 53 snprintf((char *)subsys->subnqn, sizeof(subsys->subnqn), 54 "nqn.2019-08.org.qemu:%s", nqn); 55 } 56 57 static void nvme_subsys_realize(DeviceState *dev, Error **errp) 58 { 59 NvmeSubsystem *subsys = NVME_SUBSYS(dev); 60 61 qbus_init(&subsys->bus, sizeof(NvmeBus), TYPE_NVME_BUS, dev, dev->id); 62 63 nvme_subsys_setup(subsys); 64 } 65 66 static Property nvme_subsystem_props[] = { 67 DEFINE_PROP_STRING("nqn", NvmeSubsystem, params.nqn), 68 DEFINE_PROP_END_OF_LIST(), 69 }; 70 71 static void nvme_subsys_class_init(ObjectClass *oc, void *data) 72 { 73 DeviceClass *dc = DEVICE_CLASS(oc); 74 75 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 76 77 dc->realize = nvme_subsys_realize; 78 dc->desc = "Virtual NVMe subsystem"; 79 dc->hotpluggable = false; 80 81 device_class_set_props(dc, nvme_subsystem_props); 82 } 83 84 static const TypeInfo nvme_subsys_info = { 85 .name = TYPE_NVME_SUBSYS, 86 .parent = TYPE_DEVICE, 87 .class_init = nvme_subsys_class_init, 88 .instance_size = sizeof(NvmeSubsystem), 89 }; 90 91 static void nvme_subsys_register_types(void) 92 { 93 type_register_static(&nvme_subsys_info); 94 } 95 96 type_init(nvme_subsys_register_types) 97