diff options
Diffstat (limited to 'roms/seabios/src/hw/virtio-blk.c')
| -rw-r--r-- | roms/seabios/src/hw/virtio-blk.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/roms/seabios/src/hw/virtio-blk.c b/roms/seabios/src/hw/virtio-blk.c new file mode 100644 index 000000000..0290d671c --- /dev/null +++ b/roms/seabios/src/hw/virtio-blk.c @@ -0,0 +1,177 @@ +// Virtio block boot support. +// +// Copyright (C) 2010 Red Hat Inc. +// +// Authors: +// Gleb Natapov <gnatapov@redhat.com> +// +// This file may be distributed under the terms of the GNU LGPLv3 license. + +#include "biosvar.h" // GET_GLOBALFLAT +#include "config.h" // CONFIG_* +#include "block.h" // struct drive_s +#include "malloc.h" // free +#include "output.h" // dprintf +#include "pci.h" // foreachpci +#include "pci_ids.h" // PCI_DEVICE_ID_VIRTIO_BLK +#include "pci_regs.h" // PCI_VENDOR_ID +#include "std/disk.h" // DISK_RET_SUCCESS +#include "string.h" // memset +#include "util.h" // usleep +#include "virtio-pci.h" +#include "virtio-ring.h" +#include "virtio-blk.h" + +struct virtiodrive_s { + struct drive_s drive; + struct vring_virtqueue *vq; + u16 ioaddr; +}; + +static int +virtio_blk_op(struct disk_op_s *op, int write) +{ + struct virtiodrive_s *vdrive_gf = + container_of(op->drive_gf, struct virtiodrive_s, drive); + struct vring_virtqueue *vq = GET_GLOBALFLAT(vdrive_gf->vq); + struct virtio_blk_outhdr hdr = { + .type = write ? VIRTIO_BLK_T_OUT : VIRTIO_BLK_T_IN, + .ioprio = 0, + .sector = op->lba, + }; + u8 status = VIRTIO_BLK_S_UNSUPP; + struct vring_list sg[] = { + { + .addr = MAKE_FLATPTR(GET_SEG(SS), &hdr), + .length = sizeof(hdr), + }, + { + .addr = op->buf_fl, + .length = GET_GLOBALFLAT(vdrive_gf->drive.blksize) * op->count, + }, + { + .addr = MAKE_FLATPTR(GET_SEG(SS), &status), + .length = sizeof(status), + }, + }; + + /* Add to virtqueue and kick host */ + if (write) + vring_add_buf(vq, sg, 2, 1, 0, 0); + else + vring_add_buf(vq, sg, 1, 2, 0, 0); + vring_kick(GET_GLOBALFLAT(vdrive_gf->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(GET_GLOBALFLAT(vdrive_gf->ioaddr)); + + return status == VIRTIO_BLK_S_OK ? DISK_RET_SUCCESS : DISK_RET_EBADTRACK; +} + +int +process_virtio_blk_op(struct disk_op_s *op) +{ + if (! CONFIG_VIRTIO_BLK) + return 0; + switch (op->command) { + case CMD_READ: + return virtio_blk_op(op, 0); + case CMD_WRITE: + return virtio_blk_op(op, 1); + case CMD_FORMAT: + case CMD_RESET: + case CMD_ISREADY: + case CMD_VERIFY: + case CMD_SEEK: + return DISK_RET_SUCCESS; + default: + op->count = 0; + return DISK_RET_EPARAM; + } +} + +static void +init_virtio_blk(struct pci_device *pci) +{ + u16 bdf = pci->bdf; + dprintf(1, "found virtio-blk at %x:%x\n", pci_bdf_to_bus(bdf), + pci_bdf_to_dev(bdf)); + struct virtiodrive_s *vdrive = malloc_fseg(sizeof(*vdrive)); + if (!vdrive) { + warn_noalloc(); + return; + } + memset(vdrive, 0, sizeof(*vdrive)); + vdrive->drive.type = DTYPE_VIRTIO_BLK; + vdrive->drive.cntl_id = bdf; + + u16 ioaddr = vp_init_simple(bdf); + vdrive->ioaddr = ioaddr; + if (vp_find_vq(ioaddr, 0, &vdrive->vq) < 0 ) { + dprintf(1, "fail to find vq for virtio-blk %x:%x\n", + pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf)); + goto fail; + } + + struct virtio_blk_config cfg; + vp_get(ioaddr, 0, &cfg, sizeof(cfg)); + + u32 f = vp_get_features(ioaddr); + vdrive->drive.blksize = (f & (1 << VIRTIO_BLK_F_BLK_SIZE)) ? + cfg.blk_size : DISK_SECTOR_SIZE; + + vdrive->drive.sectors = cfg.capacity; + dprintf(3, "virtio-blk %x:%x blksize=%d sectors=%u\n", + pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf), + vdrive->drive.blksize, (u32)vdrive->drive.sectors); + + if (vdrive->drive.blksize != DISK_SECTOR_SIZE) { + dprintf(1, "virtio-blk %x:%x block size %d is unsupported\n", + pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf), + vdrive->drive.blksize); + goto fail; + } + + vdrive->drive.pchs.cylinder = cfg.cylinders; + vdrive->drive.pchs.head = cfg.heads; + vdrive->drive.pchs.sector = cfg.sectors; + char *desc = znprintf(MAXDESCSIZE, "Virtio disk PCI:%x:%x", + pci_bdf_to_bus(bdf), pci_bdf_to_dev(bdf)); + + boot_add_hd(&vdrive->drive, desc, bootprio_find_pci_device(pci)); + + vp_set_status(ioaddr, VIRTIO_CONFIG_S_ACKNOWLEDGE | + VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK); + return; + +fail: + free(vdrive->vq); + free(vdrive); +} + +void +virtio_blk_setup(void) +{ + ASSERT32FLAT(); + if (! CONFIG_VIRTIO_BLK) + return; + + dprintf(3, "init virtio-blk\n"); + + struct pci_device *pci; + foreachpci(pci) { + if (pci->vendor != PCI_VENDOR_ID_REDHAT_QUMRANET + || pci->device != PCI_DEVICE_ID_VIRTIO_BLK) + continue; + init_virtio_blk(pci); + } +} |