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; 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 return cntlid; 33 } 34 35 void nvme_subsys_unregister_ctrl(NvmeSubsystem *subsys, NvmeCtrl *n) 36 { 37 subsys->ctrls[n->cntlid] = NULL; 38 } 39 40 static void nvme_subsys_setup(NvmeSubsystem *subsys) 41 { 42 const char *nqn = subsys->params.nqn ? 43 subsys->params.nqn : subsys->parent_obj.id; 44 45 snprintf((char *)subsys->subnqn, sizeof(subsys->subnqn), 46 "nqn.2019-08.org.qemu:%s", nqn); 47 } 48 49 static void nvme_subsys_realize(DeviceState *dev, Error **errp) 50 { 51 NvmeSubsystem *subsys = NVME_SUBSYS(dev); 52 53 qbus_create_inplace(&subsys->bus, sizeof(NvmeBus), TYPE_NVME_BUS, dev, 54 dev->id); 55 56 nvme_subsys_setup(subsys); 57 } 58 59 static Property nvme_subsystem_props[] = { 60 DEFINE_PROP_STRING("nqn", NvmeSubsystem, params.nqn), 61 DEFINE_PROP_END_OF_LIST(), 62 }; 63 64 static void nvme_subsys_class_init(ObjectClass *oc, void *data) 65 { 66 DeviceClass *dc = DEVICE_CLASS(oc); 67 68 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 69 70 dc->realize = nvme_subsys_realize; 71 dc->desc = "Virtual NVMe subsystem"; 72 dc->hotpluggable = false; 73 74 device_class_set_props(dc, nvme_subsystem_props); 75 } 76 77 static const TypeInfo nvme_subsys_info = { 78 .name = TYPE_NVME_SUBSYS, 79 .parent = TYPE_DEVICE, 80 .class_init = nvme_subsys_class_init, 81 .instance_size = sizeof(NvmeSubsystem), 82 }; 83 84 static void nvme_subsys_register_types(void) 85 { 86 type_register_static(&nvme_subsys_info); 87 } 88 89 type_init(nvme_subsys_register_types) 90