hw/block/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/units.h"
  10 #include "qemu/osdep.h"
  11 #include "qemu/uuid.h"
  12 #include "qemu/iov.h"
  13 #include "qemu/cutils.h"
  14 #include "qapi/error.h"
  15 #include "hw/qdev-properties.h"
  16 #include "hw/qdev-core.h"
  17 #include "hw/block/block.h"
  18 #include "block/aio.h"
  19 #include "block/accounting.h"
  20 #include "sysemu/sysemu.h"
  21 #include "hw/pci/pci.h"
  22 #include "nvme.h"
  23 #include "nvme-subsys.h"
  24
  25 int nvme_subsys_register_ctrl(NvmeCtrl *n, Error **errp)
  26 {
  27     NvmeSubsystem *subsys = n->subsys;
  28     int cntlid;
  29
  30     for (cntlid = 0; cntlid < ARRAY_SIZE(subsys->ctrls); cntlid++) {
  31         if (!subsys->ctrls[cntlid]) {
  32             break;
  33         }
  34     }
  35
  36     if (cntlid == ARRAY_SIZE(subsys->ctrls)) {
  37         error_setg(errp, "no more free controller id");
  38         return -1;
  39     }
  40
  41     subsys->ctrls[cntlid] = n;
  42
  43     return cntlid;
  44 }
  45
  46 static void nvme_subsys_setup(NvmeSubsystem *subsys)
  47 {
  48     const char *nqn = subsys->params.nqn ?
  49         subsys->params.nqn : subsys->parent_obj.id;
  50
  51     snprintf((char *)subsys->subnqn, sizeof(subsys->subnqn),
  52              "nqn.2019-08.org.qemu:%s", nqn);
  53 }
  54
  55 static void nvme_subsys_realize(DeviceState *dev, Error **errp)
  56 {
  57     NvmeSubsystem *subsys = NVME_SUBSYS(dev);
  58
  59     nvme_subsys_setup(subsys);
  60 }
  61
  62 static Property nvme_subsystem_props[] = {
  63     DEFINE_PROP_STRING("nqn", NvmeSubsystem, params.nqn),
  64     DEFINE_PROP_END_OF_LIST(),
  65 };
  66
  67 static void nvme_subsys_class_init(ObjectClass *oc, void *data)
  68 {
  69     DeviceClass *dc = DEVICE_CLASS(oc);
  70
  71     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
  72
  73     dc->realize = nvme_subsys_realize;
  74     dc->desc = "Virtual NVMe subsystem";
  75
  76     device_class_set_props(dc, nvme_subsystem_props);
  77 }
  78
  79 static const TypeInfo nvme_subsys_info = {
  80     .name = TYPE_NVME_SUBSYS,
  81     .parent = TYPE_DEVICE,
  82     .class_init = nvme_subsys_class_init,
  83     .instance_size = sizeof(NvmeSubsystem),
  84 };
  85
  86 static void nvme_subsys_register_types(void)
  87 {
  88     type_register_static(&nvme_subsys_info);
  89 }
  90
  91 type_init(nvme_subsys_register_types)