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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
Kevin O'Connorbaac6b62011-06-19 10:46:28 -040011#include "pci.h" // foreachbdf
Gleb Natapov89acfa32010-05-10 11:36:37 +030012#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
Kevin O'Connor72eee3e2010-12-27 19:07:49 -050016#include "boot.h" // boot_add_hd
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
Gleb Natapov5feb83c2010-08-23 10:23:45 +030029virtio_blk_op(struct disk_op_s *op, int write)
Gleb Natapov89acfa32010-05-10 11:36:37 +030030{
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 = {
Gleb Natapov5feb83c2010-08-23 10:23:45 +030035 .type = write ? VIRTIO_BLK_T_OUT : VIRTIO_BLK_T_IN,
Gleb Natapov89acfa32010-05-10 11:36:37 +030036 .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 */
Gleb Natapov5feb83c2010-08-23 10:23:45 +030056 if (write)
57 vring_add_buf(vq, sg, 2, 1, 0, 0);
58 else
59 vring_add_buf(vq, sg, 1, 2, 0, 0);
Gleb Natapov89acfa32010-05-10 11:36:37 +030060 vring_kick(GET_GLOBAL(vdrive_g->ioaddr), vq, 1);
61
62 /* Wait for reply */
63 while (!vring_more_used(vq))
Kevin O'Connorea8ac632010-05-16 11:34:38 -040064 usleep(5);
Gleb Natapov89acfa32010-05-10 11:36:37 +030065
66 /* Reclaim virtqueue element */
67 vring_get_buf(vq, NULL);
Stefan Hajnoczi4e0daae2010-07-07 13:34:22 +010068
69 /* Clear interrupt status register. Avoid leaving interrupts stuck if
70 * VRING_AVAIL_F_NO_INTERRUPT was ignored and interrupts were raised.
71 */
72 vp_get_isr(GET_GLOBAL(vdrive_g->ioaddr));
73
Gleb Natapov89acfa32010-05-10 11:36:37 +030074 return status == VIRTIO_BLK_S_OK ? DISK_RET_SUCCESS : DISK_RET_EBADTRACK;
75}
76
77int
78process_virtio_op(struct disk_op_s *op)
79{
Kevin O'Connor2515a722010-05-23 10:19:03 -040080 if (! CONFIG_VIRTIO_BLK || CONFIG_COREBOOT)
81 return 0;
Gleb Natapov89acfa32010-05-10 11:36:37 +030082 switch (op->command) {
83 case CMD_READ:
Gleb Natapov5feb83c2010-08-23 10:23:45 +030084 return virtio_blk_op(op, 0);
Gleb Natapov89acfa32010-05-10 11:36:37 +030085 case CMD_WRITE:
Gleb Natapov5feb83c2010-08-23 10:23:45 +030086 return virtio_blk_op(op, 1);
87 case CMD_FORMAT:
Gleb Natapov89acfa32010-05-10 11:36:37 +030088 case CMD_RESET:
89 case CMD_ISREADY:
90 case CMD_VERIFY:
91 case CMD_SEEK:
92 return DISK_RET_SUCCESS;
93 default:
94 op->count = 0;
95 return DISK_RET_EPARAM;
96 }
97}
98
Kevin O'Connorc4fe1352010-05-20 00:22:02 -040099static void
100init_virtio_blk(u16 bdf)
101{
102 dprintf(1, "found virtio-blk at %x:%x\n", pci_bdf_to_bus(bdf),
103 pci_bdf_to_dev(bdf));
Kevin O'Connorc4fe1352010-05-20 00:22:02 -0400104 struct virtiodrive_s *vdrive_g = malloc_fseg(sizeof(*vdrive_g));
105 struct vring_virtqueue *vq = memalign_low(PAGE_SIZE, sizeof(*vq));
Kevin O'Connorca2bc1c2010-12-29 21:41:19 -0500106 if (!vdrive_g || !vq) {
Kevin O'Connorc4fe1352010-05-20 00:22:02 -0400107 warn_noalloc();
108 goto fail;
109 }
110 memset(vdrive_g, 0, sizeof(*vdrive_g));
Gleb Natapov0f673972010-09-15 18:31:44 +0200111 memset(vq, 0, sizeof(*vq));
Kevin O'Connorc4fe1352010-05-20 00:22:02 -0400112 vdrive_g->drive.type = DTYPE_VIRTIO;
113 vdrive_g->drive.cntl_id = bdf;
114 vdrive_g->vq = vq;
115
116 u16 ioaddr = pci_config_readl(bdf, PCI_BASE_ADDRESS_0) &
117 PCI_BASE_ADDRESS_IO_MASK;
118
119 vdrive_g->ioaddr = ioaddr;
120
121 vp_reset(ioaddr);
122 vp_set_status(ioaddr, VIRTIO_CONFIG_S_ACKNOWLEDGE |
123 VIRTIO_CONFIG_S_DRIVER );
124
125 if (vp_find_vq(ioaddr, 0, vdrive_g->vq) < 0 ) {
126 dprintf(1, "fail to find vq for virtio-blk %x:%x\n",
127 pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
128 goto fail;
129 }
130
131 struct virtio_blk_config cfg;
132 vp_get(ioaddr, 0, &cfg, sizeof(cfg));
133
134 u32 f = vp_get_features(ioaddr);
135 vdrive_g->drive.blksize = (f & (1 << VIRTIO_BLK_F_BLK_SIZE)) ?
136 cfg.blk_size : DISK_SECTOR_SIZE;
137
138 vdrive_g->drive.sectors = cfg.capacity;
139 dprintf(3, "virtio-blk %x:%x blksize=%d sectors=%u\n",
140 pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf),
141 vdrive_g->drive.blksize, (u32)vdrive_g->drive.sectors);
142
143 if (vdrive_g->drive.blksize != DISK_SECTOR_SIZE) {
144 dprintf(1, "virtio-blk %x:%x block size %d is unsupported\n",
145 pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf),
146 vdrive_g->drive.blksize);
147 goto fail;
148 }
149
150 vdrive_g->drive.pchs.cylinders = cfg.cylinders;
151 vdrive_g->drive.pchs.heads = cfg.heads;
152 vdrive_g->drive.pchs.spt = cfg.sectors;
Kevin O'Connorca2bc1c2010-12-29 21:41:19 -0500153 char *desc = znprintf(MAXDESCSIZE, "Virtio disk PCI:%x:%x",
154 pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf));
Kevin O'Connorc4fe1352010-05-20 00:22:02 -0400155
Kevin O'Connorca2bc1c2010-12-29 21:41:19 -0500156 boot_add_hd(&vdrive_g->drive, desc, bootprio_find_pci_device(bdf));
Kevin O'Connorc4fe1352010-05-20 00:22:02 -0400157
Kevin O'Connorc4fe1352010-05-20 00:22:02 -0400158 vp_set_status(ioaddr, VIRTIO_CONFIG_S_ACKNOWLEDGE |
159 VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK);
160 return;
161
162fail:
163 free(vdrive_g);
Kevin O'Connorc4fe1352010-05-20 00:22:02 -0400164 free(vq);
165}
166
Gleb Natapov89acfa32010-05-10 11:36:37 +0300167void
168virtio_blk_setup(void)
169{
170 ASSERT32FLAT();
Kevin O'Connor2515a722010-05-23 10:19:03 -0400171 if (! CONFIG_VIRTIO_BLK || CONFIG_COREBOOT)
Gleb Natapov89acfa32010-05-10 11:36:37 +0300172 return;
173
174 dprintf(3, "init virtio-blk\n");
175
176 int bdf, max;
177 u32 id = PCI_VENDOR_ID_REDHAT_QUMRANET | (PCI_DEVICE_ID_VIRTIO_BLK << 16);
Kevin O'Connorbaac6b62011-06-19 10:46:28 -0400178 foreachbdf(bdf, max) {
Gleb Natapov89acfa32010-05-10 11:36:37 +0300179 u32 v = pci_config_readl(bdf, PCI_VENDOR_ID);
180 if (v != id)
181 continue;
Kevin O'Connorc4fe1352010-05-20 00:22:02 -0400182 init_virtio_blk(bdf);
Gleb Natapov89acfa32010-05-10 11:36:37 +0300183 }
184}