blob: 7f9b3d2fadb960fd5ed4f88ee39481347dc88ce7 [file] [log] [blame]
Gleb Natapov89acfa32010-05-10 11:36:37 +03001// Virtio block boot support.
2//
3// Copyright (C) 2010 Red Hat Inc.
4//
5// Authors:
6// Gleb Natapov <gnatapov@redhat.com>
7//
8// This file may be distributed under the terms of the GNU LGPLv3 license.
9
10#include "util.h" // dprintf
11#include "pci.h" // foreachpci
12#include "config.h" // CONFIG_*
Kevin O'Connor7d09d0e2010-05-10 21:51:38 -040013#include "biosvar.h" // GET_GLOBAL
14#include "pci_ids.h" // PCI_DEVICE_ID_VIRTIO_BLK
15#include "pci_regs.h" // PCI_VENDOR_ID
16#include "boot.h" // add_bcv_internal
Gleb Natapov89acfa32010-05-10 11:36:37 +030017#include "virtio-pci.h"
Kevin O'Connor7d09d0e2010-05-10 21:51:38 -040018#include "virtio-ring.h"
Gleb Natapov89acfa32010-05-10 11:36:37 +030019#include "virtio-blk.h"
20#include "disk.h"
21
22struct virtiodrive_s {
23 struct drive_s drive;
24 struct vring_virtqueue *vq;
25 u16 ioaddr;
26};
27
28static int
29virtio_blk_read(struct disk_op_s *op)
30{
31 struct virtiodrive_s *vdrive_g =
32 container_of(op->drive_g, struct virtiodrive_s, drive);
33 struct vring_virtqueue *vq = GET_GLOBAL(vdrive_g->vq);
34 struct virtio_blk_outhdr hdr = {
35 .type = VIRTIO_BLK_T_IN,
36 .ioprio = 0,
37 .sector = op->lba,
38 };
39 u8 status = VIRTIO_BLK_S_UNSUPP;
40 struct vring_list sg[] = {
41 {
42 .addr = MAKE_FLATPTR(GET_SEG(SS), &hdr),
43 .length = sizeof(hdr),
44 },
45 {
46 .addr = op->buf_fl,
47 .length = GET_GLOBAL(vdrive_g->drive.blksize) * op->count,
48 },
49 {
50 .addr = MAKE_FLATPTR(GET_SEG(SS), &status),
51 .length = sizeof(status),
52 },
53 };
54
55 /* Add to virtqueue and kick host */
56 vring_add_buf(vq, sg, 1, 2, 0, 0);
57 vring_kick(GET_GLOBAL(vdrive_g->ioaddr), vq, 1);
58
59 /* Wait for reply */
60 while (!vring_more_used(vq))
Kevin O'Connorea8ac632010-05-16 11:34:38 -040061 usleep(5);
Gleb Natapov89acfa32010-05-10 11:36:37 +030062
63 /* Reclaim virtqueue element */
64 vring_get_buf(vq, NULL);
65 return status == VIRTIO_BLK_S_OK ? DISK_RET_SUCCESS : DISK_RET_EBADTRACK;
66}
67
68int
69process_virtio_op(struct disk_op_s *op)
70{
71 switch (op->command) {
72 case CMD_READ:
73 return virtio_blk_read(op);
74 case CMD_FORMAT:
75 case CMD_WRITE:
76 return DISK_RET_EWRITEPROTECT;
77 case CMD_RESET:
78 case CMD_ISREADY:
79 case CMD_VERIFY:
80 case CMD_SEEK:
81 return DISK_RET_SUCCESS;
82 default:
83 op->count = 0;
84 return DISK_RET_EPARAM;
85 }
86}
87
Kevin O'Connorc4fe1352010-05-20 00:22:02 -040088static void
89init_virtio_blk(u16 bdf)
90{
91 dprintf(1, "found virtio-blk at %x:%x\n", pci_bdf_to_bus(bdf),
92 pci_bdf_to_dev(bdf));
93 char *desc = malloc_tmphigh(MAXDESCSIZE);
94 struct virtiodrive_s *vdrive_g = malloc_fseg(sizeof(*vdrive_g));
95 struct vring_virtqueue *vq = memalign_low(PAGE_SIZE, sizeof(*vq));
96 if (!vdrive_g || !desc || !vq) {
97 warn_noalloc();
98 goto fail;
99 }
100 memset(vdrive_g, 0, sizeof(*vdrive_g));
101 vdrive_g->drive.type = DTYPE_VIRTIO;
102 vdrive_g->drive.cntl_id = bdf;
103 vdrive_g->vq = vq;
104
105 u16 ioaddr = pci_config_readl(bdf, PCI_BASE_ADDRESS_0) &
106 PCI_BASE_ADDRESS_IO_MASK;
107
108 vdrive_g->ioaddr = ioaddr;
109
110 vp_reset(ioaddr);
111 vp_set_status(ioaddr, VIRTIO_CONFIG_S_ACKNOWLEDGE |
112 VIRTIO_CONFIG_S_DRIVER );
113
114 if (vp_find_vq(ioaddr, 0, vdrive_g->vq) < 0 ) {
115 dprintf(1, "fail to find vq for virtio-blk %x:%x\n",
116 pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
117 goto fail;
118 }
119
120 struct virtio_blk_config cfg;
121 vp_get(ioaddr, 0, &cfg, sizeof(cfg));
122
123 u32 f = vp_get_features(ioaddr);
124 vdrive_g->drive.blksize = (f & (1 << VIRTIO_BLK_F_BLK_SIZE)) ?
125 cfg.blk_size : DISK_SECTOR_SIZE;
126
127 vdrive_g->drive.sectors = cfg.capacity;
128 dprintf(3, "virtio-blk %x:%x blksize=%d sectors=%u\n",
129 pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf),
130 vdrive_g->drive.blksize, (u32)vdrive_g->drive.sectors);
131
132 if (vdrive_g->drive.blksize != DISK_SECTOR_SIZE) {
133 dprintf(1, "virtio-blk %x:%x block size %d is unsupported\n",
134 pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf),
135 vdrive_g->drive.blksize);
136 goto fail;
137 }
138
139 vdrive_g->drive.pchs.cylinders = cfg.cylinders;
140 vdrive_g->drive.pchs.heads = cfg.heads;
141 vdrive_g->drive.pchs.spt = cfg.sectors;
142
143 setup_translation(&vdrive_g->drive);
144 add_bcv_internal(&vdrive_g->drive);
145
146 snprintf(desc, MAXDESCSIZE, "Virtio disk PCI:%x:%x",
147 pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
148
149 vdrive_g->drive.desc = desc;
150
151 vp_set_status(ioaddr, VIRTIO_CONFIG_S_ACKNOWLEDGE |
152 VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK);
153 return;
154
155fail:
156 free(vdrive_g);
157 free(desc);
158 free(vq);
159}
160
Gleb Natapov89acfa32010-05-10 11:36:37 +0300161void
162virtio_blk_setup(void)
163{
164 ASSERT32FLAT();
165 if (! CONFIG_VIRTIO_BLK)
166 return;
167
168 dprintf(3, "init virtio-blk\n");
169
170 int bdf, max;
171 u32 id = PCI_VENDOR_ID_REDHAT_QUMRANET | (PCI_DEVICE_ID_VIRTIO_BLK << 16);
172 foreachpci(bdf, max) {
173 u32 v = pci_config_readl(bdf, PCI_VENDOR_ID);
174 if (v != id)
175 continue;
Kevin O'Connorc4fe1352010-05-20 00:22:02 -0400176 init_virtio_blk(bdf);
Gleb Natapov89acfa32010-05-10 11:36:37 +0300177 }
178}