hw/nvme/subsys.c

   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)