LXR qemu/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
  14int 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
  42void nvme_subsys_unregister_ctrl(NvmeSubsystem *subsys, NvmeCtrl *n)
  43{
  44    subsys->ctrls[n->cntlid] = NULL;
  45    n->cntlid = -1;
  46}
  47
  48static 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
  57static 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
  66static Property nvme_subsystem_props[] = {
  67    DEFINE_PROP_STRING("nqn", NvmeSubsystem, params.nqn),
  68    DEFINE_PROP_END_OF_LIST(),
  69};
  70
  71static 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
  84static 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
  91static void nvme_subsys_register_types(void)
  92{
  93    type_register_static(&nvme_subsys_info);
  94}
  95
  96type_init(nvme_subsys_register_types)
  97