1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
// Virtio SCSI boot support.
//
// Copyright (C) 2012 Red Hat Inc.
//
// Authors:
// Paolo Bonzini <pbonzini@redhat.com>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "util.h" // dprintf
#include "pci.h" // foreachpci
#include "config.h" // CONFIG_*
#include "biosvar.h" // GET_GLOBAL
#include "pci_ids.h" // PCI_DEVICE_ID_VIRTIO_BLK
#include "pci_regs.h" // PCI_VENDOR_ID
#include "boot.h" // bootprio_find_scsi_device
#include "blockcmd.h" // scsi_init_drive
#include "virtio-pci.h"
#include "virtio-ring.h"
#include "virtio-scsi.h"
#include "disk.h"
struct virtio_lun_s {
struct drive_s drive;
struct pci_device *pci;
struct vring_virtqueue *vq;
u16 ioaddr;
u16 target;
u16 lun;
};
static int
virtio_scsi_cmd(u16 ioaddr, struct vring_virtqueue *vq, struct disk_op_s *op,
void *cdbcmd, u16 target, u16 lun, u16 blocksize)
{
struct virtio_scsi_req_cmd req;
struct virtio_scsi_resp_cmd resp;
struct vring_list sg[3];
memset(&req, 0, sizeof(req));
req.lun[0] = 1;
req.lun[1] = target;
req.lun[2] = (lun >> 8) | 0x40;
req.lun[3] = (lun & 0xff);
memcpy(req.cdb, cdbcmd, 16);
u32 len = op->count * blocksize;
int datain = cdb_is_read(cdbcmd, blocksize);
int in_num = (datain ? 2 : 1);
int out_num = (len ? 3 : 2) - in_num;
sg[0].addr = MAKE_FLATPTR(GET_SEG(SS), &req);
sg[0].length = sizeof(req);
sg[out_num].addr = MAKE_FLATPTR(GET_SEG(SS), &resp);
sg[out_num].length = sizeof(resp);
if (len) {
int data_idx = (datain ? 2 : 1);
sg[data_idx].addr = op->buf_fl;
sg[data_idx].length = len;
}
/* Add to virtqueue and kick host */
vring_add_buf(vq, sg, out_num, in_num, 0, 0);
vring_kick(ioaddr, vq, 1);
/* Wait for reply */
while (!vring_more_used(vq))
usleep(5);
/* Reclaim virtqueue element */
vring_get_buf(vq, NULL);
/* Clear interrupt status register. Avoid leaving interrupts stuck if
* VRING_AVAIL_F_NO_INTERRUPT was ignored and interrupts were raised.
*/
vp_get_isr(ioaddr);
if (resp.response == VIRTIO_SCSI_S_OK && resp.status == 0) {
return DISK_RET_SUCCESS;
}
return DISK_RET_EBADTRACK;
}
int
virtio_scsi_cmd_data(struct disk_op_s *op, void *cdbcmd, u16 blocksize)
{
struct virtio_lun_s *vlun =
container_of(op->drive_g, struct virtio_lun_s, drive);
return virtio_scsi_cmd(GET_GLOBAL(vlun->ioaddr),
GET_GLOBAL(vlun->vq), op, cdbcmd,
GET_GLOBAL(vlun->target), GET_GLOBAL(vlun->lun),
blocksize);
}
static int
virtio_scsi_add_lun(struct pci_device *pci, u16 ioaddr,
struct vring_virtqueue *vq, u16 target, u16 lun)
{
struct virtio_lun_s *vlun = malloc_fseg(sizeof(*vlun));
if (!vlun) {
warn_noalloc();
return -1;
}
memset(vlun, 0, sizeof(*vlun));
vlun->drive.type = DTYPE_VIRTIO_SCSI;
vlun->drive.cntl_id = pci->bdf;
vlun->pci = pci;
vlun->ioaddr = ioaddr;
vlun->vq = vq;
vlun->target = target;
vlun->lun = lun;
int prio = bootprio_find_scsi_device(pci, target, lun);
int ret = scsi_init_drive(&vlun->drive, "virtio-scsi", prio);
if (ret)
goto fail;
return 0;
fail:
free(vlun);
return -1;
}
static int
virtio_scsi_scan_target(struct pci_device *pci, u16 ioaddr,
struct vring_virtqueue *vq, u16 target)
{
/* TODO: send REPORT LUNS. For now, only LUN 0 is recognized. */
int ret = virtio_scsi_add_lun(pci, ioaddr, vq, target, 0);
return ret < 0 ? 0 : 1;
}
static void
init_virtio_scsi(struct pci_device *pci)
{
u16 bdf = pci->bdf;
dprintf(1, "found virtio-scsi at %x:%x\n", pci_bdf_to_bus(bdf),
pci_bdf_to_dev(bdf));
struct vring_virtqueue *vq = NULL;
u16 ioaddr = vp_init_simple(bdf);
if (vp_find_vq(ioaddr, 2, &vq) < 0 ) {
dprintf(1, "fail to find vq for virtio-scsi %x:%x\n",
pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
goto fail;
}
vp_set_status(ioaddr, VIRTIO_CONFIG_S_ACKNOWLEDGE |
VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK);
int i, tot;
for (tot = 0, i = 0; i < 256; i++)
tot += virtio_scsi_scan_target(pci, ioaddr, vq, i);
if (!tot)
goto fail;
return;
fail:
free(vq);
}
void
virtio_scsi_setup(void)
{
ASSERT32FLAT();
if (! CONFIG_VIRTIO_SCSI || CONFIG_COREBOOT)
return;
dprintf(3, "init virtio-scsi\n");
struct pci_device *pci;
foreachpci(pci) {
if (pci->vendor != PCI_VENDOR_ID_REDHAT_QUMRANET
|| pci->device != PCI_DEVICE_ID_VIRTIO_SCSI)
continue;
init_virtio_scsi(pci);
}
}
|
