diff options
Diffstat (limited to 'lib/libhvcall/virtio-blk.c')
| -rw-r--r-- | lib/libhvcall/virtio-blk.c | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/lib/libhvcall/virtio-blk.c b/lib/libhvcall/virtio-blk.c deleted file mode 100644 index d4cdb04..0000000 --- a/lib/libhvcall/virtio-blk.c +++ /dev/null @@ -1,160 +0,0 @@ -/****************************************************************************** - * Copyright (c) 2011 IBM Corporation - * All rights reserved. - * This program and the accompanying materials - * are made available under the terms of the BSD License - * which accompanies this distribution, and is available at - * http://www.opensource.org/licenses/bsd-license.php - * - * Contributors: - * IBM Corporation - initial implementation - *****************************************************************************/ - -#include <stdio.h> -#include "virtio.h" -#include "virtio-blk.h" -#include "libhvcall.h" - - -#define sync() asm volatile (" sync \n" ::: "memory") - - -/** - * Initialize virtio-block device. - * @param dev pointer to virtio device information - */ -int -virtioblk_init(struct virtio_device *dev) -{ - struct vring_avail *vq_avail; - - /* Reset device */ - // virtio_reset_device(dev); - - /* Acknowledge device. */ - virtio_set_status(dev, VIRTIO_STAT_ACKNOWLEDGE); - - /* Tell HV that we know how to drive the device. */ - virtio_set_status(dev, VIRTIO_STAT_ACKNOWLEDGE|VIRTIO_STAT_DRIVER); - - /* Device specific setup - we do not support special features right now */ - virtio_set_guest_features(dev, 0); - - vq_avail = virtio_get_vring_avail(dev, 0); - vq_avail->flags = VRING_AVAIL_F_NO_INTERRUPT; - vq_avail->idx = 0; - - /* Tell HV that setup succeeded */ - virtio_set_status(dev, VIRTIO_STAT_ACKNOWLEDGE|VIRTIO_STAT_DRIVER - |VIRTIO_STAT_DRIVER_OK); - - return 0; -} - - -/** - * Shutdown the virtio-block device. - * @param dev pointer to virtio device information - */ -void -virtioblk_shutdown(struct virtio_device *dev) -{ - /* Quiesce device */ - virtio_set_status(dev, VIRTIO_STAT_FAILED); - - /* Reset device */ - virtio_reset_device(dev); -} - - -/** - * Read blocks - * @param reg pointer to "reg" property - * @param buf pointer to destination buffer - * @param blocknum block number of the first block that should be read - * @param cnt amount of blocks that should be read - * @return number of blocks that have been read successfully - */ -int -virtioblk_read(struct virtio_device *dev, char *buf, long blocknum, long cnt) -{ - struct vring_desc *desc; - int id, i; - static struct virtio_blk_req blkhdr; - //struct virtio_blk_config *blkconf; - uint64_t capacity; - uint32_t vq_size; - struct vring_desc *vq_desc; /* Descriptor vring */ - struct vring_avail *vq_avail; /* "Available" vring */ - struct vring_used *vq_used; /* "Used" vring */ - volatile uint8_t status = -1; - volatile uint16_t *current_used_idx; - uint16_t last_used_idx; - - //printf("virtioblk_read: dev=%p buf=%p blocknum=%li count=%li\n", - // dev, buf, blocknum, cnt); - - /* Check whether request is within disk capacity */ - capacity = virtio_get_config(dev, 0, sizeof(capacity)); - if (blocknum + cnt - 1 > capacity) { - puts("virtioblk_read: Access beyond end of device!"); - return 0; - } - - vq_size = virtio_get_qsize(dev, 0); - vq_desc = virtio_get_vring_desc(dev, 0); - vq_avail = virtio_get_vring_avail(dev, 0); - vq_used = virtio_get_vring_used(dev, 0); - - last_used_idx = vq_used->idx; - current_used_idx = &vq_used->idx; - - /* Set up header */ - blkhdr.type = VIRTIO_BLK_T_IN | VIRTIO_BLK_T_BARRIER; - blkhdr.ioprio = 1; - blkhdr.sector = blocknum; - - /* Determine descriptor index */ - id = (vq_avail->idx * 3) % vq_size; - - /* Set up virtqueue descriptor for header */ - desc = &vq_desc[id]; - desc->addr = (uint64_t)&blkhdr; - desc->len = sizeof(struct virtio_blk_req); - desc->flags = VRING_DESC_F_NEXT; - desc->next = (id + 1) % vq_size; - - /* Set up virtqueue descriptor for data */ - desc = &vq_desc[(id + 1) % vq_size]; - desc->addr = (uint64_t)buf; - desc->len = cnt * 512; - desc->flags = VRING_DESC_F_NEXT | VRING_DESC_F_WRITE; - desc->next = (id + 2) % vq_size; - - /* Set up virtqueue descriptor for status */ - desc = &vq_desc[(id + 2) % vq_size]; - desc->addr = (uint64_t)&status; - desc->len = 1; - desc->flags = VRING_DESC_F_WRITE; - desc->next = 0; - - vq_avail->ring[vq_avail->idx % vq_size] = id; - sync(); - vq_avail->idx += 1; - - /* Tell HV that the queue is ready */ - virtio_queue_notify(dev, 0); - - /* Wait for host to consume the descriptor */ - i = 10000000; - while (*current_used_idx == last_used_idx && i-- > 0) { - sync(); - } - - if (status == 0) - return cnt; - - printf("virtioblk_read failed! status = %i\n", status); - - return 0; -} |