xref: /openbmc/qemu/hw/nvme/subsys.c (revision de799beb)
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     if (!subsys->serial) {
31         subsys->serial = g_strdup(n->params.serial);
32     } else if (strcmp(subsys->serial, n->params.serial)) {
33         error_setg(errp, "invalid controller serial");
34         return -1;
35     }
36 
37     subsys->ctrls[cntlid] = n;
38 
39     for (nsid = 1; nsid < ARRAY_SIZE(subsys->namespaces); nsid++) {
40         NvmeNamespace *ns = subsys->namespaces[nsid];
41         if (ns && ns->params.shared && !ns->params.detached) {
42             nvme_attach_ns(n, ns);
43         }
44     }
45 
46     return cntlid;
47 }
48 
49 void nvme_subsys_unregister_ctrl(NvmeSubsystem *subsys, NvmeCtrl *n)
50 {
51     subsys->ctrls[n->cntlid] = NULL;
52     n->cntlid = -1;
53 }
54 
55 static void nvme_subsys_setup(NvmeSubsystem *subsys)
56 {
57     const char *nqn = subsys->params.nqn ?
58         subsys->params.nqn : subsys->parent_obj.id;
59 
60     snprintf((char *)subsys->subnqn, sizeof(subsys->subnqn),
61              "nqn.2019-08.org.qemu:%s", nqn);
62 }
63 
64 static void nvme_subsys_realize(DeviceState *dev, Error **errp)
65 {
66     NvmeSubsystem *subsys = NVME_SUBSYS(dev);
67 
68     qbus_init(&subsys->bus, sizeof(NvmeBus), TYPE_NVME_BUS, dev, dev->id);
69 
70     nvme_subsys_setup(subsys);
71 }
72 
73 static Property nvme_subsystem_props[] = {
74     DEFINE_PROP_STRING("nqn", NvmeSubsystem, params.nqn),
75     DEFINE_PROP_END_OF_LIST(),
76 };
77 
78 static void nvme_subsys_class_init(ObjectClass *oc, void *data)
79 {
80     DeviceClass *dc = DEVICE_CLASS(oc);
81 
82     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
83 
84     dc->realize = nvme_subsys_realize;
85     dc->desc = "Virtual NVMe subsystem";
86     dc->hotpluggable = false;
87 
88     device_class_set_props(dc, nvme_subsystem_props);
89 }
90 
91 static const TypeInfo nvme_subsys_info = {
92     .name = TYPE_NVME_SUBSYS,
93     .parent = TYPE_DEVICE,
94     .class_init = nvme_subsys_class_init,
95     .instance_size = sizeof(NvmeSubsystem),
96 };
97 
98 static void nvme_subsys_register_types(void)
99 {
100     type_register_static(&nvme_subsys_info);
101 }
102 
103 type_init(nvme_subsys_register_types)
104