xref: /openbmc/qemu/hw/usb/dev-storage-classic.c (revision 05caa062)
1 /*
2  * USB Mass Storage Device emulation
3  *
4  * Copyright (c) 2006 CodeSourcery.
5  * Written by Paul Brook
6  *
7  * This code is licensed under the LGPL.
8  */
9 
10 #include "qemu/osdep.h"
11 #include "qapi/error.h"
12 #include "qapi/visitor.h"
13 #include "hw/usb.h"
14 #include "hw/usb/desc.h"
15 #include "hw/usb/msd.h"
16 #include "sysemu/sysemu.h"
17 #include "sysemu/block-backend.h"
18 
19 static const struct SCSIBusInfo usb_msd_scsi_info_storage = {
20     .tcq = false,
21     .max_target = 0,
22     .max_lun = 0,
23 
24     .transfer_data = usb_msd_transfer_data,
25     .complete = usb_msd_command_complete,
26     .cancel = usb_msd_request_cancelled,
27     .load_request = usb_msd_load_request,
28 };
29 
30 static void usb_msd_storage_realize(USBDevice *dev, Error **errp)
31 {
32     MSDState *s = USB_STORAGE_DEV(dev);
33     BlockBackend *blk = s->conf.blk;
34     SCSIDevice *scsi_dev;
35 
36     if (!blk) {
37         error_setg(errp, "drive property not set");
38         return;
39     }
40 
41     /*
42      * Hack alert: this pretends to be a block device, but it's really
43      * a SCSI bus that can serve only a single device, which it
44      * creates automatically.  But first it needs to detach from its
45      * blockdev, or else scsi_bus_legacy_add_drive() dies when it
46      * attaches again. We also need to take another reference so that
47      * blk_detach_dev() doesn't free blk while we still need it.
48      *
49      * The hack is probably a bad idea.
50      */
51     blk_ref(blk);
52     blk_detach_dev(blk, DEVICE(s));
53     s->conf.blk = NULL;
54 
55     usb_desc_create_serial(dev);
56     usb_desc_init(dev);
57     dev->flags |= (1 << USB_DEV_FLAG_IS_SCSI_STORAGE);
58     scsi_bus_init(&s->bus, sizeof(s->bus), DEVICE(dev),
59                  &usb_msd_scsi_info_storage);
60     scsi_dev = scsi_bus_legacy_add_drive(&s->bus, blk, 0, !!s->removable,
61                                          &s->conf, dev->serial, errp);
62     blk_unref(blk);
63     if (!scsi_dev) {
64         return;
65     }
66     usb_msd_handle_reset(dev);
67     s->scsi_dev = scsi_dev;
68 }
69 
70 static Property msd_properties[] = {
71     DEFINE_BLOCK_PROPERTIES(MSDState, conf),
72     DEFINE_BLOCK_ERROR_PROPERTIES(MSDState, conf),
73     DEFINE_PROP_BOOL("removable", MSDState, removable, false),
74     DEFINE_PROP_BOOL("commandlog", MSDState, commandlog, false),
75     DEFINE_PROP_END_OF_LIST(),
76 };
77 
78 static void usb_msd_class_storage_initfn(ObjectClass *klass, void *data)
79 {
80     DeviceClass *dc = DEVICE_CLASS(klass);
81     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
82 
83     uc->realize = usb_msd_storage_realize;
84     device_class_set_props(dc, msd_properties);
85 }
86 
87 static void usb_msd_get_bootindex(Object *obj, Visitor *v, const char *name,
88                                   void *opaque, Error **errp)
89 {
90     USBDevice *dev = USB_DEVICE(obj);
91     MSDState *s = USB_STORAGE_DEV(dev);
92 
93     visit_type_int32(v, name, &s->conf.bootindex, errp);
94 }
95 
96 static void usb_msd_set_bootindex(Object *obj, Visitor *v, const char *name,
97                                   void *opaque, Error **errp)
98 {
99     USBDevice *dev = USB_DEVICE(obj);
100     MSDState *s = USB_STORAGE_DEV(dev);
101     int32_t boot_index;
102     Error *local_err = NULL;
103 
104     if (!visit_type_int32(v, name, &boot_index, errp)) {
105         return;
106     }
107     /* check whether bootindex is present in fw_boot_order list  */
108     check_boot_index(boot_index, &local_err);
109     if (local_err) {
110         goto out;
111     }
112     /* change bootindex to a new one */
113     s->conf.bootindex = boot_index;
114 
115     if (s->scsi_dev) {
116         object_property_set_int(OBJECT(s->scsi_dev), "bootindex", boot_index,
117                                 &error_abort);
118     }
119 
120 out:
121     error_propagate(errp, local_err);
122 }
123 
124 static void usb_msd_instance_init(Object *obj)
125 {
126     object_property_add(obj, "bootindex", "int32",
127                         usb_msd_get_bootindex,
128                         usb_msd_set_bootindex, NULL, NULL);
129     object_property_set_int(obj, "bootindex", -1, NULL);
130 }
131 
132 static const TypeInfo msd_info = {
133     .name          = "usb-storage",
134     .parent        = TYPE_USB_STORAGE,
135     .class_init    = usb_msd_class_storage_initfn,
136     .instance_init = usb_msd_instance_init,
137 };
138 
139 static void register_types(void)
140 {
141     type_register_static(&msd_info);
142 }
143 
144 type_init(register_types)
145