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