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, 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)