1 // 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 "biosvar.h" // GET_GLOBALFLAT
11 #include "config.h" // CONFIG_*
12 #include "block.h" // struct drive_s
13 #include "malloc.h" // free
14 #include "output.h" // dprintf
15 #include "pcidevice.h" // foreachpci
16 #include "pci_ids.h" // PCI_DEVICE_ID_VIRTIO_BLK
17 #include "pci_regs.h" // PCI_VENDOR_ID
18 #include "stacks.h" // run_thread
19 #include "std/disk.h" // DISK_RET_SUCCESS
20 #include "string.h" // memset
21 #include "util.h" // usleep
22 #include "virtio-pci.h"
23 #include "virtio-ring.h"
24 #include "virtio-blk.h"
25
26 struct virtiodrive_s {
27 struct drive_s drive;
28 struct vring_virtqueue *vq;
29 struct vp_device vp;
30 };
31
32 static int
virtio_blk_op(struct disk_op_s * op,int write)33 virtio_blk_op(struct disk_op_s *op, int write)
34 {
35 struct virtiodrive_s *vdrive =
36 container_of(op->drive_fl, struct virtiodrive_s, drive);
37 struct vring_virtqueue *vq = vdrive->vq;
38 struct virtio_blk_outhdr hdr = {
39 .type = write ? VIRTIO_BLK_T_OUT : VIRTIO_BLK_T_IN,
40 .ioprio = 0,
41 .sector = op->lba,
42 };
43 u8 status = VIRTIO_BLK_S_UNSUPP;
44 struct vring_list sg[] = {
45 {
46 .addr = (void*)(&hdr),
47 .length = sizeof(hdr),
48 },
49 {
50 .addr = op->buf_fl,
51 .length = vdrive->drive.blksize * op->count,
52 },
53 {
54 .addr = (void*)(&status),
55 .length = sizeof(status),
56 },
57 };
58
59 /* Add to virtqueue and kick host */
60 if (write)
61 vring_add_buf(vq, sg, 2, 1, 0, 0);
62 else
63 vring_add_buf(vq, sg, 1, 2, 0, 0);
64 vring_kick(&vdrive->vp, vq, 1);
65
66 /* Wait for reply */
67 while (!vring_more_used(vq))
68 usleep(5);
69
70 /* Reclaim virtqueue element */
71 vring_get_buf(vq, NULL);
72
73 /* Clear interrupt status register. Avoid leaving interrupts stuck if
74 * VRING_AVAIL_F_NO_INTERRUPT was ignored and interrupts were raised.
75 */
76 vp_get_isr(&vdrive->vp);
77
78 return status == VIRTIO_BLK_S_OK ? DISK_RET_SUCCESS : DISK_RET_EBADTRACK;
79 }
80
81 int
virtio_blk_process_op(struct disk_op_s * op)82 virtio_blk_process_op(struct disk_op_s *op)
83 {
84 if (! CONFIG_VIRTIO_BLK)
85 return 0;
86 switch (op->command) {
87 case CMD_READ:
88 return virtio_blk_op(op, 0);
89 case CMD_WRITE:
90 return virtio_blk_op(op, 1);
91 default:
92 return default_process_op(op);
93 }
94 }
95
96 static void
init_virtio_blk(void * data)97 init_virtio_blk(void *data)
98 {
99 struct pci_device *pci = data;
100 u8 status = VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER;
101 dprintf(1, "found virtio-blk at %pP\n", pci);
102 struct virtiodrive_s *vdrive = malloc_low(sizeof(*vdrive));
103 if (!vdrive) {
104 warn_noalloc();
105 return;
106 }
107 memset(vdrive, 0, sizeof(*vdrive));
108 vdrive->drive.type = DTYPE_VIRTIO_BLK;
109 vdrive->drive.cntl_id = pci->bdf;
110
111 vp_init_simple(&vdrive->vp, pci);
112 if (vp_find_vq(&vdrive->vp, 0, &vdrive->vq) < 0 ) {
113 dprintf(1, "fail to find vq for virtio-blk %pP\n", pci);
114 goto fail;
115 }
116
117 if (vdrive->vp.use_modern) {
118 struct vp_device *vp = &vdrive->vp;
119 u64 features = vp_get_features(vp);
120 u64 version1 = 1ull << VIRTIO_F_VERSION_1;
121 u64 iommu_platform = 1ull << VIRTIO_F_IOMMU_PLATFORM;
122 u64 blk_size = 1ull << VIRTIO_BLK_F_BLK_SIZE;
123 if (!(features & version1)) {
124 dprintf(1, "modern device without virtio_1 feature bit: %pP\n", pci);
125 goto fail;
126 }
127
128 features = features & (version1 | iommu_platform | blk_size);
129 vp_set_features(vp, features);
130 status |= VIRTIO_CONFIG_S_FEATURES_OK;
131 vp_set_status(vp, status);
132 if (!(vp_get_status(vp) & VIRTIO_CONFIG_S_FEATURES_OK)) {
133 dprintf(1, "device didn't accept features: %pP\n", pci);
134 goto fail;
135 }
136
137 vdrive->drive.sectors =
138 vp_read(&vp->device, struct virtio_blk_config, capacity);
139 if (features & blk_size) {
140 vdrive->drive.blksize =
141 vp_read(&vp->device, struct virtio_blk_config, blk_size);
142 } else {
143 vdrive->drive.blksize = DISK_SECTOR_SIZE;
144 }
145 if (vdrive->drive.blksize != DISK_SECTOR_SIZE) {
146 dprintf(1, "virtio-blk %pP block size %d is unsupported\n",
147 pci, vdrive->drive.blksize);
148 goto fail;
149 }
150 dprintf(3, "virtio-blk %pP blksize=%d sectors=%u\n",
151 pci, vdrive->drive.blksize, (u32)vdrive->drive.sectors);
152
153 vdrive->drive.pchs.cylinder =
154 vp_read(&vp->device, struct virtio_blk_config, cylinders);
155 vdrive->drive.pchs.head =
156 vp_read(&vp->device, struct virtio_blk_config, heads);
157 vdrive->drive.pchs.sector =
158 vp_read(&vp->device, struct virtio_blk_config, sectors);
159 } else {
160 struct virtio_blk_config cfg;
161 vp_get_legacy(&vdrive->vp, 0, &cfg, sizeof(cfg));
162
163 u64 f = vp_get_features(&vdrive->vp);
164 vdrive->drive.blksize = (f & (1 << VIRTIO_BLK_F_BLK_SIZE)) ?
165 cfg.blk_size : DISK_SECTOR_SIZE;
166
167 vdrive->drive.sectors = cfg.capacity;
168 dprintf(3, "virtio-blk %pP blksize=%d sectors=%u\n",
169 pci, vdrive->drive.blksize, (u32)vdrive->drive.sectors);
170
171 if (vdrive->drive.blksize != DISK_SECTOR_SIZE) {
172 dprintf(1, "virtio-blk %pP block size %d is unsupported\n",
173 pci, vdrive->drive.blksize);
174 goto fail;
175 }
176 vdrive->drive.pchs.cylinder = cfg.cylinders;
177 vdrive->drive.pchs.head = cfg.heads;
178 vdrive->drive.pchs.sector = cfg.sectors;
179 }
180
181 char *desc = znprintf(MAXDESCSIZE, "Virtio disk PCI:%pP", pci);
182 boot_add_hd(&vdrive->drive, desc, bootprio_find_pci_device(pci));
183
184 status |= VIRTIO_CONFIG_S_DRIVER_OK;
185 vp_set_status(&vdrive->vp, status);
186
187 boot_lchs_find_pci_device(pci, &vdrive->drive.lchs);
188 return;
189
190 fail:
191 vp_reset(&vdrive->vp);
192 free(vdrive->vq);
193 free(vdrive);
194 }
195
196 void
virtio_blk_setup(void)197 virtio_blk_setup(void)
198 {
199 ASSERT32FLAT();
200 if (! CONFIG_VIRTIO_BLK)
201 return;
202
203 dprintf(3, "init virtio-blk\n");
204
205 struct pci_device *pci;
206 foreachpci(pci) {
207 if (pci->vendor != PCI_VENDOR_ID_REDHAT_QUMRANET ||
208 (pci->device != PCI_DEVICE_ID_VIRTIO_BLK_09 &&
209 pci->device != PCI_DEVICE_ID_VIRTIO_BLK_10))
210 continue;
211 run_thread(init_virtio_blk, pci);
212 }
213 }
214