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/*
* Virtio driver bits
*
* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#include "libc.h"
#include "s390-ccw.h"
#include "virtio.h"
#include "virtio-scsi.h"
#define VIRTIO_BLK_F_GEOMETRY (1 << 4)
#define VIRTIO_BLK_F_BLK_SIZE (1 << 6)
static int virtio_blk_read_many(VDev *vdev, ulong sector, void *load_addr,
int sec_num)
{
VirtioBlkOuthdr out_hdr;
u8 status;
VRing *vr = &vdev->vrings[vdev->cmd_vr_idx];
/* Tell the host we want to read */
out_hdr.type = VIRTIO_BLK_T_IN;
out_hdr.ioprio = 99;
out_hdr.sector = virtio_sector_adjust(sector);
vring_send_buf(vr, &out_hdr, sizeof(out_hdr), VRING_DESC_F_NEXT);
/* This is where we want to receive data */
vring_send_buf(vr, load_addr, virtio_get_block_size() * sec_num,
VRING_DESC_F_WRITE | VRING_HIDDEN_IS_CHAIN |
VRING_DESC_F_NEXT);
/* status field */
vring_send_buf(vr, &status, sizeof(u8),
VRING_DESC_F_WRITE | VRING_HIDDEN_IS_CHAIN);
/* Now we can tell the host to read */
vring_wait_reply();
if (drain_irqs(vr->schid)) {
/* Well, whatever status is supposed to contain... */
status = 1;
}
return status;
}
int virtio_read_many(ulong sector, void *load_addr, int sec_num)
{
VDev *vdev = virtio_get_device();
switch (vdev->senseid.cu_model) {
case VIRTIO_ID_BLOCK:
return virtio_blk_read_many(vdev, sector, load_addr, sec_num);
case VIRTIO_ID_SCSI:
return virtio_scsi_read_many(vdev, sector, load_addr, sec_num);
}
panic("\n! No readable IPL device !\n");
return -1;
}
unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2,
ulong subchan_id, void *load_addr)
{
u8 status;
int sec = rec_list1;
int sec_num = ((rec_list2 >> 32) & 0xffff) + 1;
int sec_len = rec_list2 >> 48;
ulong addr = (ulong)load_addr;
if (sec_len != virtio_get_block_size()) {
return -1;
}
sclp_print(".");
status = virtio_read_many(sec, (void *)addr, sec_num);
if (status) {
panic("I/O Error");
}
addr += sec_num * virtio_get_block_size();
return addr;
}
int virtio_read(ulong sector, void *load_addr)
{
return virtio_read_many(sector, load_addr, 1);
}
/*
* Other supported value pairs, if any, would need to be added here.
* Note: head count is always 15.
*/
static inline u8 virtio_eckd_sectors_for_block_size(int size)
{
switch (size) {
case 512:
return 49;
case 1024:
return 33;
case 2048:
return 21;
case 4096:
return 12;
}
return 0;
}
VirtioGDN virtio_guessed_disk_nature(void)
{
return virtio_get_device()->guessed_disk_nature;
}
void virtio_assume_iso9660(void)
{
VDev *vdev = virtio_get_device();
switch (vdev->senseid.cu_model) {
case VIRTIO_ID_BLOCK:
vdev->guessed_disk_nature = VIRTIO_GDN_SCSI;
vdev->config.blk.blk_size = VIRTIO_ISO_BLOCK_SIZE;
vdev->config.blk.physical_block_exp = 0;
vdev->blk_factor = VIRTIO_ISO_BLOCK_SIZE / VIRTIO_SECTOR_SIZE;
break;
case VIRTIO_ID_SCSI:
vdev->scsi_block_size = VIRTIO_ISO_BLOCK_SIZE;
break;
}
}
void virtio_assume_eckd(void)
{
VDev *vdev = virtio_get_device();
vdev->guessed_disk_nature = VIRTIO_GDN_DASD;
vdev->blk_factor = 1;
vdev->config.blk.physical_block_exp = 0;
switch (vdev->senseid.cu_model) {
case VIRTIO_ID_BLOCK:
vdev->config.blk.blk_size = VIRTIO_DASD_DEFAULT_BLOCK_SIZE;
break;
case VIRTIO_ID_SCSI:
vdev->config.blk.blk_size = vdev->scsi_block_size;
break;
}
vdev->config.blk.geometry.heads = 15;
vdev->config.blk.geometry.sectors =
virtio_eckd_sectors_for_block_size(vdev->config.blk.blk_size);
}
bool virtio_ipl_disk_is_valid(void)
{
int blksize = virtio_get_block_size();
VDev *vdev = virtio_get_device();
if (vdev->guessed_disk_nature == VIRTIO_GDN_SCSI ||
vdev->guessed_disk_nature == VIRTIO_GDN_DASD) {
return true;
}
return (vdev->senseid.cu_model == VIRTIO_ID_BLOCK ||
vdev->senseid.cu_model == VIRTIO_ID_SCSI) &&
blksize >= 512 && blksize <= 4096;
}
int virtio_get_block_size(void)
{
VDev *vdev = virtio_get_device();
switch (vdev->senseid.cu_model) {
case VIRTIO_ID_BLOCK:
return vdev->config.blk.blk_size << vdev->config.blk.physical_block_exp;
case VIRTIO_ID_SCSI:
return vdev->scsi_block_size;
}
return 0;
}
uint8_t virtio_get_heads(void)
{
VDev *vdev = virtio_get_device();
switch (vdev->senseid.cu_model) {
case VIRTIO_ID_BLOCK:
return vdev->config.blk.geometry.heads;
case VIRTIO_ID_SCSI:
return vdev->guessed_disk_nature == VIRTIO_GDN_DASD
? vdev->config.blk.geometry.heads : 255;
}
return 0;
}
uint8_t virtio_get_sectors(void)
{
VDev *vdev = virtio_get_device();
switch (vdev->senseid.cu_model) {
case VIRTIO_ID_BLOCK:
return vdev->config.blk.geometry.sectors;
case VIRTIO_ID_SCSI:
return vdev->guessed_disk_nature == VIRTIO_GDN_DASD
? vdev->config.blk.geometry.sectors : 63;
}
return 0;
}
uint64_t virtio_get_blocks(void)
{
VDev *vdev = virtio_get_device();
const uint64_t factor = virtio_get_block_size() / VIRTIO_SECTOR_SIZE;
switch (vdev->senseid.cu_model) {
case VIRTIO_ID_BLOCK:
return vdev->config.blk.capacity / factor;
case VIRTIO_ID_SCSI:
return vdev->scsi_last_block / factor;
}
return 0;
}
int virtio_blk_setup_device(SubChannelId schid)
{
VDev *vdev = virtio_get_device();
vdev->guest_features[0] = VIRTIO_BLK_F_GEOMETRY | VIRTIO_BLK_F_BLK_SIZE;
vdev->schid = schid;
virtio_setup_ccw(vdev);
sclp_print("Using virtio-blk.\n");
return 0;
}
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