2012-02-05 04:16:00 -07:00
|
|
|
/*
|
|
|
|
* Virtio SCSI HBA driver
|
|
|
|
*
|
|
|
|
* Copyright IBM Corp. 2010
|
|
|
|
* Copyright Red Hat, Inc. 2011
|
|
|
|
*
|
|
|
|
* Authors:
|
|
|
|
* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
|
|
|
|
* Paolo Bonzini <pbonzini@redhat.com>
|
|
|
|
*
|
|
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
|
|
* See the COPYING file in the top-level directory.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/mempool.h>
|
|
|
|
#include <linux/virtio.h>
|
|
|
|
#include <linux/virtio_ids.h>
|
|
|
|
#include <linux/virtio_config.h>
|
|
|
|
#include <linux/virtio_scsi.h>
|
|
|
|
#include <scsi/scsi_host.h>
|
|
|
|
#include <scsi/scsi_device.h>
|
|
|
|
#include <scsi/scsi_cmnd.h>
|
|
|
|
|
|
|
|
#define VIRTIO_SCSI_MEMPOOL_SZ 64
|
2012-07-05 03:06:43 -06:00
|
|
|
#define VIRTIO_SCSI_EVENT_LEN 8
|
2012-02-05 04:16:00 -07:00
|
|
|
|
|
|
|
/* Command queue element */
|
|
|
|
struct virtio_scsi_cmd {
|
|
|
|
struct scsi_cmnd *sc;
|
|
|
|
struct completion *comp;
|
|
|
|
union {
|
|
|
|
struct virtio_scsi_cmd_req cmd;
|
|
|
|
struct virtio_scsi_ctrl_tmf_req tmf;
|
|
|
|
struct virtio_scsi_ctrl_an_req an;
|
|
|
|
} req;
|
|
|
|
union {
|
|
|
|
struct virtio_scsi_cmd_resp cmd;
|
|
|
|
struct virtio_scsi_ctrl_tmf_resp tmf;
|
|
|
|
struct virtio_scsi_ctrl_an_resp an;
|
|
|
|
struct virtio_scsi_event evt;
|
|
|
|
} resp;
|
|
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
|
2012-07-05 03:06:43 -06:00
|
|
|
struct virtio_scsi_event_node {
|
|
|
|
struct virtio_scsi *vscsi;
|
|
|
|
struct virtio_scsi_event event;
|
|
|
|
struct work_struct work;
|
|
|
|
};
|
|
|
|
|
2012-06-13 08:56:32 -06:00
|
|
|
struct virtio_scsi_vq {
|
|
|
|
/* Protects vq */
|
|
|
|
spinlock_t vq_lock;
|
|
|
|
|
|
|
|
struct virtqueue *vq;
|
|
|
|
};
|
|
|
|
|
2012-06-13 08:56:34 -06:00
|
|
|
/* Per-target queue state */
|
|
|
|
struct virtio_scsi_target_state {
|
|
|
|
/* Protects sg. Lock hierarchy is tgt_lock -> vq_lock. */
|
|
|
|
spinlock_t tgt_lock;
|
|
|
|
|
|
|
|
/* For sglist construction when adding commands to the virtqueue. */
|
|
|
|
struct scatterlist sg[];
|
|
|
|
};
|
|
|
|
|
2012-02-05 04:16:00 -07:00
|
|
|
/* Driver instance state */
|
|
|
|
struct virtio_scsi {
|
|
|
|
struct virtio_device *vdev;
|
2012-06-13 08:56:34 -06:00
|
|
|
|
2012-06-13 08:56:32 -06:00
|
|
|
struct virtio_scsi_vq ctrl_vq;
|
|
|
|
struct virtio_scsi_vq event_vq;
|
|
|
|
struct virtio_scsi_vq req_vq;
|
2012-02-05 04:16:00 -07:00
|
|
|
|
2012-07-05 03:06:43 -06:00
|
|
|
/* Get some buffers ready for event vq */
|
|
|
|
struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN];
|
|
|
|
|
2012-06-13 08:56:34 -06:00
|
|
|
struct virtio_scsi_target_state *tgt[];
|
2012-02-05 04:16:00 -07:00
|
|
|
};
|
|
|
|
|
|
|
|
static struct kmem_cache *virtscsi_cmd_cache;
|
|
|
|
static mempool_t *virtscsi_cmd_pool;
|
|
|
|
|
|
|
|
static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev)
|
|
|
|
{
|
|
|
|
return vdev->priv;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid)
|
|
|
|
{
|
|
|
|
if (!resid)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (!scsi_bidi_cmnd(sc)) {
|
|
|
|
scsi_set_resid(sc, resid);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
scsi_in(sc)->resid = min(resid, scsi_in(sc)->length);
|
|
|
|
scsi_out(sc)->resid = resid - scsi_in(sc)->resid;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done
|
|
|
|
*
|
|
|
|
* Called with vq_lock held.
|
|
|
|
*/
|
|
|
|
static void virtscsi_complete_cmd(void *buf)
|
|
|
|
{
|
|
|
|
struct virtio_scsi_cmd *cmd = buf;
|
|
|
|
struct scsi_cmnd *sc = cmd->sc;
|
|
|
|
struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd;
|
|
|
|
|
|
|
|
dev_dbg(&sc->device->sdev_gendev,
|
|
|
|
"cmd %p response %u status %#02x sense_len %u\n",
|
|
|
|
sc, resp->response, resp->status, resp->sense_len);
|
|
|
|
|
|
|
|
sc->result = resp->status;
|
|
|
|
virtscsi_compute_resid(sc, resp->resid);
|
|
|
|
switch (resp->response) {
|
|
|
|
case VIRTIO_SCSI_S_OK:
|
|
|
|
set_host_byte(sc, DID_OK);
|
|
|
|
break;
|
|
|
|
case VIRTIO_SCSI_S_OVERRUN:
|
|
|
|
set_host_byte(sc, DID_ERROR);
|
|
|
|
break;
|
|
|
|
case VIRTIO_SCSI_S_ABORTED:
|
|
|
|
set_host_byte(sc, DID_ABORT);
|
|
|
|
break;
|
|
|
|
case VIRTIO_SCSI_S_BAD_TARGET:
|
|
|
|
set_host_byte(sc, DID_BAD_TARGET);
|
|
|
|
break;
|
|
|
|
case VIRTIO_SCSI_S_RESET:
|
|
|
|
set_host_byte(sc, DID_RESET);
|
|
|
|
break;
|
|
|
|
case VIRTIO_SCSI_S_BUSY:
|
|
|
|
set_host_byte(sc, DID_BUS_BUSY);
|
|
|
|
break;
|
|
|
|
case VIRTIO_SCSI_S_TRANSPORT_FAILURE:
|
|
|
|
set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
|
|
|
|
break;
|
|
|
|
case VIRTIO_SCSI_S_TARGET_FAILURE:
|
|
|
|
set_host_byte(sc, DID_TARGET_FAILURE);
|
|
|
|
break;
|
|
|
|
case VIRTIO_SCSI_S_NEXUS_FAILURE:
|
|
|
|
set_host_byte(sc, DID_NEXUS_FAILURE);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
scmd_printk(KERN_WARNING, sc, "Unknown response %d",
|
|
|
|
resp->response);
|
|
|
|
/* fall through */
|
|
|
|
case VIRTIO_SCSI_S_FAILURE:
|
|
|
|
set_host_byte(sc, DID_ERROR);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
WARN_ON(resp->sense_len > VIRTIO_SCSI_SENSE_SIZE);
|
|
|
|
if (sc->sense_buffer) {
|
|
|
|
memcpy(sc->sense_buffer, resp->sense,
|
|
|
|
min_t(u32, resp->sense_len, VIRTIO_SCSI_SENSE_SIZE));
|
|
|
|
if (resp->sense_len)
|
|
|
|
set_driver_byte(sc, DRIVER_SENSE);
|
|
|
|
}
|
|
|
|
|
|
|
|
mempool_free(cmd, virtscsi_cmd_pool);
|
|
|
|
sc->scsi_done(sc);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void virtscsi_vq_done(struct virtqueue *vq, void (*fn)(void *buf))
|
|
|
|
{
|
|
|
|
void *buf;
|
|
|
|
unsigned int len;
|
|
|
|
|
|
|
|
do {
|
|
|
|
virtqueue_disable_cb(vq);
|
|
|
|
while ((buf = virtqueue_get_buf(vq, &len)) != NULL)
|
|
|
|
fn(buf);
|
|
|
|
} while (!virtqueue_enable_cb(vq));
|
|
|
|
}
|
|
|
|
|
|
|
|
static void virtscsi_req_done(struct virtqueue *vq)
|
|
|
|
{
|
2012-06-13 08:56:32 -06:00
|
|
|
struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
|
|
|
|
struct virtio_scsi *vscsi = shost_priv(sh);
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&vscsi->req_vq.vq_lock, flags);
|
2012-02-05 04:16:00 -07:00
|
|
|
virtscsi_vq_done(vq, virtscsi_complete_cmd);
|
2012-06-13 08:56:32 -06:00
|
|
|
spin_unlock_irqrestore(&vscsi->req_vq.vq_lock, flags);
|
2012-02-05 04:16:00 -07:00
|
|
|
};
|
|
|
|
|
|
|
|
static void virtscsi_complete_free(void *buf)
|
|
|
|
{
|
|
|
|
struct virtio_scsi_cmd *cmd = buf;
|
|
|
|
|
|
|
|
if (cmd->comp)
|
|
|
|
complete_all(cmd->comp);
|
2012-05-04 04:32:04 -06:00
|
|
|
else
|
|
|
|
mempool_free(cmd, virtscsi_cmd_pool);
|
2012-02-05 04:16:00 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static void virtscsi_ctrl_done(struct virtqueue *vq)
|
|
|
|
{
|
2012-06-13 08:56:32 -06:00
|
|
|
struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
|
|
|
|
struct virtio_scsi *vscsi = shost_priv(sh);
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&vscsi->ctrl_vq.vq_lock, flags);
|
2012-02-05 04:16:00 -07:00
|
|
|
virtscsi_vq_done(vq, virtscsi_complete_free);
|
2012-06-13 08:56:32 -06:00
|
|
|
spin_unlock_irqrestore(&vscsi->ctrl_vq.vq_lock, flags);
|
2012-02-05 04:16:00 -07:00
|
|
|
};
|
|
|
|
|
2012-07-05 03:06:43 -06:00
|
|
|
static int virtscsi_kick_event(struct virtio_scsi *vscsi,
|
|
|
|
struct virtio_scsi_event_node *event_node)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
struct scatterlist sg;
|
|
|
|
unsigned long flags;
|
|
|
|
|
2012-10-02 09:25:46 -06:00
|
|
|
sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event));
|
2012-07-05 03:06:43 -06:00
|
|
|
|
|
|
|
spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags);
|
|
|
|
|
|
|
|
ret = virtqueue_add_buf(vscsi->event_vq.vq, &sg, 0, 1, event_node, GFP_ATOMIC);
|
|
|
|
if (ret >= 0)
|
|
|
|
virtqueue_kick(vscsi->event_vq.vq);
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int virtscsi_kick_event_all(struct virtio_scsi *vscsi)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) {
|
|
|
|
vscsi->event_list[i].vscsi = vscsi;
|
|
|
|
virtscsi_kick_event(vscsi, &vscsi->event_list[i]);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++)
|
|
|
|
cancel_work_sync(&vscsi->event_list[i].work);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi,
|
|
|
|
struct virtio_scsi_event *event)
|
|
|
|
{
|
|
|
|
struct scsi_device *sdev;
|
|
|
|
struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
|
|
|
|
unsigned int target = event->lun[1];
|
|
|
|
unsigned int lun = (event->lun[2] << 8) | event->lun[3];
|
|
|
|
|
|
|
|
switch (event->reason) {
|
|
|
|
case VIRTIO_SCSI_EVT_RESET_RESCAN:
|
|
|
|
scsi_add_device(shost, 0, target, lun);
|
|
|
|
break;
|
|
|
|
case VIRTIO_SCSI_EVT_RESET_REMOVED:
|
|
|
|
sdev = scsi_device_lookup(shost, 0, target, lun);
|
|
|
|
if (sdev) {
|
|
|
|
scsi_remove_device(sdev);
|
|
|
|
scsi_device_put(sdev);
|
|
|
|
} else {
|
|
|
|
pr_err("SCSI device %d 0 %d %d not found\n",
|
|
|
|
shost->host_no, target, lun);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
pr_info("Unsupport virtio scsi event reason %x\n", event->reason);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-10-02 09:25:48 -06:00
|
|
|
static void virtscsi_handle_param_change(struct virtio_scsi *vscsi,
|
|
|
|
struct virtio_scsi_event *event)
|
|
|
|
{
|
|
|
|
struct scsi_device *sdev;
|
|
|
|
struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
|
|
|
|
unsigned int target = event->lun[1];
|
|
|
|
unsigned int lun = (event->lun[2] << 8) | event->lun[3];
|
|
|
|
u8 asc = event->reason & 255;
|
|
|
|
u8 ascq = event->reason >> 8;
|
|
|
|
|
|
|
|
sdev = scsi_device_lookup(shost, 0, target, lun);
|
|
|
|
if (!sdev) {
|
|
|
|
pr_err("SCSI device %d 0 %d %d not found\n",
|
|
|
|
shost->host_no, target, lun);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Handle "Parameters changed", "Mode parameters changed", and
|
|
|
|
"Capacity data has changed". */
|
|
|
|
if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09))
|
|
|
|
scsi_rescan_device(&sdev->sdev_gendev);
|
|
|
|
|
|
|
|
scsi_device_put(sdev);
|
|
|
|
}
|
|
|
|
|
2012-07-05 03:06:43 -06:00
|
|
|
static void virtscsi_handle_event(struct work_struct *work)
|
|
|
|
{
|
|
|
|
struct virtio_scsi_event_node *event_node =
|
|
|
|
container_of(work, struct virtio_scsi_event_node, work);
|
|
|
|
struct virtio_scsi *vscsi = event_node->vscsi;
|
|
|
|
struct virtio_scsi_event *event = &event_node->event;
|
|
|
|
|
|
|
|
if (event->event & VIRTIO_SCSI_T_EVENTS_MISSED) {
|
|
|
|
event->event &= ~VIRTIO_SCSI_T_EVENTS_MISSED;
|
|
|
|
scsi_scan_host(virtio_scsi_host(vscsi->vdev));
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (event->event) {
|
|
|
|
case VIRTIO_SCSI_T_NO_EVENT:
|
|
|
|
break;
|
|
|
|
case VIRTIO_SCSI_T_TRANSPORT_RESET:
|
|
|
|
virtscsi_handle_transport_reset(vscsi, event);
|
|
|
|
break;
|
2012-10-02 09:25:48 -06:00
|
|
|
case VIRTIO_SCSI_T_PARAM_CHANGE:
|
|
|
|
virtscsi_handle_param_change(vscsi, event);
|
|
|
|
break;
|
2012-07-05 03:06:43 -06:00
|
|
|
default:
|
|
|
|
pr_err("Unsupport virtio scsi event %x\n", event->event);
|
|
|
|
}
|
|
|
|
virtscsi_kick_event(vscsi, event_node);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void virtscsi_complete_event(void *buf)
|
|
|
|
{
|
|
|
|
struct virtio_scsi_event_node *event_node = buf;
|
|
|
|
|
|
|
|
INIT_WORK(&event_node->work, virtscsi_handle_event);
|
|
|
|
schedule_work(&event_node->work);
|
|
|
|
}
|
|
|
|
|
2012-02-05 04:16:00 -07:00
|
|
|
static void virtscsi_event_done(struct virtqueue *vq)
|
|
|
|
{
|
2012-06-13 08:56:32 -06:00
|
|
|
struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
|
|
|
|
struct virtio_scsi *vscsi = shost_priv(sh);
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags);
|
2012-07-05 03:06:43 -06:00
|
|
|
virtscsi_vq_done(vq, virtscsi_complete_event);
|
2012-06-13 08:56:32 -06:00
|
|
|
spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags);
|
2012-02-05 04:16:00 -07:00
|
|
|
};
|
|
|
|
|
|
|
|
static void virtscsi_map_sgl(struct scatterlist *sg, unsigned int *p_idx,
|
|
|
|
struct scsi_data_buffer *sdb)
|
|
|
|
{
|
|
|
|
struct sg_table *table = &sdb->table;
|
|
|
|
struct scatterlist *sg_elem;
|
|
|
|
unsigned int idx = *p_idx;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for_each_sg(table->sgl, sg_elem, table->nents, i)
|
2012-07-30 00:25:06 -06:00
|
|
|
sg[idx++] = *sg_elem;
|
2012-02-05 04:16:00 -07:00
|
|
|
|
|
|
|
*p_idx = idx;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* virtscsi_map_cmd - map a scsi_cmd to a virtqueue scatterlist
|
|
|
|
* @vscsi : virtio_scsi state
|
|
|
|
* @cmd : command structure
|
|
|
|
* @out_num : number of read-only elements
|
|
|
|
* @in_num : number of write-only elements
|
|
|
|
* @req_size : size of the request buffer
|
|
|
|
* @resp_size : size of the response buffer
|
|
|
|
*
|
2012-06-13 08:56:34 -06:00
|
|
|
* Called with tgt_lock held.
|
2012-02-05 04:16:00 -07:00
|
|
|
*/
|
2012-06-13 08:56:34 -06:00
|
|
|
static void virtscsi_map_cmd(struct virtio_scsi_target_state *tgt,
|
2012-02-05 04:16:00 -07:00
|
|
|
struct virtio_scsi_cmd *cmd,
|
|
|
|
unsigned *out_num, unsigned *in_num,
|
|
|
|
size_t req_size, size_t resp_size)
|
|
|
|
{
|
|
|
|
struct scsi_cmnd *sc = cmd->sc;
|
2012-06-13 08:56:34 -06:00
|
|
|
struct scatterlist *sg = tgt->sg;
|
2012-02-05 04:16:00 -07:00
|
|
|
unsigned int idx = 0;
|
|
|
|
|
|
|
|
/* Request header. */
|
|
|
|
sg_set_buf(&sg[idx++], &cmd->req, req_size);
|
|
|
|
|
|
|
|
/* Data-out buffer. */
|
|
|
|
if (sc && sc->sc_data_direction != DMA_FROM_DEVICE)
|
|
|
|
virtscsi_map_sgl(sg, &idx, scsi_out(sc));
|
|
|
|
|
|
|
|
*out_num = idx;
|
|
|
|
|
|
|
|
/* Response header. */
|
|
|
|
sg_set_buf(&sg[idx++], &cmd->resp, resp_size);
|
|
|
|
|
|
|
|
/* Data-in buffer */
|
|
|
|
if (sc && sc->sc_data_direction != DMA_TO_DEVICE)
|
|
|
|
virtscsi_map_sgl(sg, &idx, scsi_in(sc));
|
|
|
|
|
|
|
|
*in_num = idx - *out_num;
|
|
|
|
}
|
|
|
|
|
2012-06-13 08:56:34 -06:00
|
|
|
static int virtscsi_kick_cmd(struct virtio_scsi_target_state *tgt,
|
|
|
|
struct virtio_scsi_vq *vq,
|
2012-02-05 04:16:00 -07:00
|
|
|
struct virtio_scsi_cmd *cmd,
|
|
|
|
size_t req_size, size_t resp_size, gfp_t gfp)
|
|
|
|
{
|
|
|
|
unsigned int out_num, in_num;
|
|
|
|
unsigned long flags;
|
|
|
|
int ret;
|
|
|
|
|
2012-06-13 08:56:34 -06:00
|
|
|
spin_lock_irqsave(&tgt->tgt_lock, flags);
|
|
|
|
virtscsi_map_cmd(tgt, cmd, &out_num, &in_num, req_size, resp_size);
|
2012-02-05 04:16:00 -07:00
|
|
|
|
2012-06-13 08:56:32 -06:00
|
|
|
spin_lock(&vq->vq_lock);
|
2012-06-13 08:56:34 -06:00
|
|
|
ret = virtqueue_add_buf(vq->vq, tgt->sg, out_num, in_num, cmd, gfp);
|
|
|
|
spin_unlock(&tgt->tgt_lock);
|
2012-02-05 04:16:00 -07:00
|
|
|
if (ret >= 0)
|
2012-06-13 08:56:32 -06:00
|
|
|
ret = virtqueue_kick_prepare(vq->vq);
|
|
|
|
|
2012-06-13 08:56:33 -06:00
|
|
|
spin_unlock_irqrestore(&vq->vq_lock, flags);
|
2012-02-05 04:16:00 -07:00
|
|
|
|
2012-06-13 08:56:31 -06:00
|
|
|
if (ret > 0)
|
2012-06-13 08:56:32 -06:00
|
|
|
virtqueue_notify(vq->vq);
|
2012-02-05 04:16:00 -07:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int virtscsi_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
|
|
|
|
{
|
|
|
|
struct virtio_scsi *vscsi = shost_priv(sh);
|
2012-06-13 08:56:34 -06:00
|
|
|
struct virtio_scsi_target_state *tgt = vscsi->tgt[sc->device->id];
|
2012-02-05 04:16:00 -07:00
|
|
|
struct virtio_scsi_cmd *cmd;
|
|
|
|
int ret;
|
|
|
|
|
2012-06-13 08:56:34 -06:00
|
|
|
struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
|
|
|
|
BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize);
|
|
|
|
|
|
|
|
/* TODO: check feature bit and fail if unsupported? */
|
|
|
|
BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL);
|
|
|
|
|
2012-02-05 04:16:00 -07:00
|
|
|
dev_dbg(&sc->device->sdev_gendev,
|
|
|
|
"cmd %p CDB: %#02x\n", sc, sc->cmnd[0]);
|
|
|
|
|
|
|
|
ret = SCSI_MLQUEUE_HOST_BUSY;
|
|
|
|
cmd = mempool_alloc(virtscsi_cmd_pool, GFP_ATOMIC);
|
|
|
|
if (!cmd)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
|
|
cmd->sc = sc;
|
|
|
|
cmd->req.cmd = (struct virtio_scsi_cmd_req){
|
|
|
|
.lun[0] = 1,
|
|
|
|
.lun[1] = sc->device->id,
|
|
|
|
.lun[2] = (sc->device->lun >> 8) | 0x40,
|
|
|
|
.lun[3] = sc->device->lun & 0xff,
|
|
|
|
.tag = (unsigned long)sc,
|
|
|
|
.task_attr = VIRTIO_SCSI_S_SIMPLE,
|
|
|
|
.prio = 0,
|
|
|
|
.crn = 0,
|
|
|
|
};
|
|
|
|
|
|
|
|
BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE);
|
|
|
|
memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len);
|
|
|
|
|
2012-06-13 08:56:34 -06:00
|
|
|
if (virtscsi_kick_cmd(tgt, &vscsi->req_vq, cmd,
|
2012-02-05 04:16:00 -07:00
|
|
|
sizeof cmd->req.cmd, sizeof cmd->resp.cmd,
|
|
|
|
GFP_ATOMIC) >= 0)
|
|
|
|
ret = 0;
|
|
|
|
|
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd)
|
|
|
|
{
|
|
|
|
DECLARE_COMPLETION_ONSTACK(comp);
|
2012-06-13 08:56:34 -06:00
|
|
|
struct virtio_scsi_target_state *tgt = vscsi->tgt[cmd->sc->device->id];
|
2012-05-04 04:32:04 -06:00
|
|
|
int ret = FAILED;
|
2012-02-05 04:16:00 -07:00
|
|
|
|
|
|
|
cmd->comp = ∁
|
2012-06-13 08:56:34 -06:00
|
|
|
if (virtscsi_kick_cmd(tgt, &vscsi->ctrl_vq, cmd,
|
2012-05-04 04:32:04 -06:00
|
|
|
sizeof cmd->req.tmf, sizeof cmd->resp.tmf,
|
|
|
|
GFP_NOIO) < 0)
|
|
|
|
goto out;
|
2012-02-05 04:16:00 -07:00
|
|
|
|
|
|
|
wait_for_completion(&comp);
|
2012-05-04 04:32:04 -06:00
|
|
|
if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK ||
|
|
|
|
cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED)
|
|
|
|
ret = SUCCESS;
|
2012-02-05 04:16:00 -07:00
|
|
|
|
2012-05-04 04:32:04 -06:00
|
|
|
out:
|
|
|
|
mempool_free(cmd, virtscsi_cmd_pool);
|
|
|
|
return ret;
|
2012-02-05 04:16:00 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static int virtscsi_device_reset(struct scsi_cmnd *sc)
|
|
|
|
{
|
|
|
|
struct virtio_scsi *vscsi = shost_priv(sc->device->host);
|
|
|
|
struct virtio_scsi_cmd *cmd;
|
|
|
|
|
|
|
|
sdev_printk(KERN_INFO, sc->device, "device reset\n");
|
|
|
|
cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO);
|
|
|
|
if (!cmd)
|
|
|
|
return FAILED;
|
|
|
|
|
|
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
|
|
cmd->sc = sc;
|
|
|
|
cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){
|
|
|
|
.type = VIRTIO_SCSI_T_TMF,
|
|
|
|
.subtype = VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET,
|
|
|
|
.lun[0] = 1,
|
|
|
|
.lun[1] = sc->device->id,
|
|
|
|
.lun[2] = (sc->device->lun >> 8) | 0x40,
|
|
|
|
.lun[3] = sc->device->lun & 0xff,
|
|
|
|
};
|
|
|
|
return virtscsi_tmf(vscsi, cmd);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int virtscsi_abort(struct scsi_cmnd *sc)
|
|
|
|
{
|
|
|
|
struct virtio_scsi *vscsi = shost_priv(sc->device->host);
|
|
|
|
struct virtio_scsi_cmd *cmd;
|
|
|
|
|
|
|
|
scmd_printk(KERN_INFO, sc, "abort\n");
|
|
|
|
cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO);
|
|
|
|
if (!cmd)
|
|
|
|
return FAILED;
|
|
|
|
|
|
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
|
|
cmd->sc = sc;
|
|
|
|
cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){
|
|
|
|
.type = VIRTIO_SCSI_T_TMF,
|
|
|
|
.subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK,
|
|
|
|
.lun[0] = 1,
|
|
|
|
.lun[1] = sc->device->id,
|
|
|
|
.lun[2] = (sc->device->lun >> 8) | 0x40,
|
|
|
|
.lun[3] = sc->device->lun & 0xff,
|
|
|
|
.tag = (unsigned long)sc,
|
|
|
|
};
|
|
|
|
return virtscsi_tmf(vscsi, cmd);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct scsi_host_template virtscsi_host_template = {
|
|
|
|
.module = THIS_MODULE,
|
|
|
|
.name = "Virtio SCSI HBA",
|
|
|
|
.proc_name = "virtio_scsi",
|
|
|
|
.queuecommand = virtscsi_queuecommand,
|
|
|
|
.this_id = -1,
|
|
|
|
.eh_abort_handler = virtscsi_abort,
|
|
|
|
.eh_device_reset_handler = virtscsi_device_reset,
|
|
|
|
|
|
|
|
.can_queue = 1024,
|
|
|
|
.dma_boundary = UINT_MAX,
|
|
|
|
.use_clustering = ENABLE_CLUSTERING,
|
|
|
|
};
|
|
|
|
|
|
|
|
#define virtscsi_config_get(vdev, fld) \
|
|
|
|
({ \
|
|
|
|
typeof(((struct virtio_scsi_config *)0)->fld) __val; \
|
|
|
|
vdev->config->get(vdev, \
|
|
|
|
offsetof(struct virtio_scsi_config, fld), \
|
|
|
|
&__val, sizeof(__val)); \
|
|
|
|
__val; \
|
|
|
|
})
|
|
|
|
|
|
|
|
#define virtscsi_config_set(vdev, fld, val) \
|
|
|
|
(void)({ \
|
|
|
|
typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \
|
|
|
|
vdev->config->set(vdev, \
|
|
|
|
offsetof(struct virtio_scsi_config, fld), \
|
|
|
|
&__val, sizeof(__val)); \
|
|
|
|
})
|
|
|
|
|
2012-06-13 08:56:32 -06:00
|
|
|
static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq,
|
|
|
|
struct virtqueue *vq)
|
|
|
|
{
|
|
|
|
spin_lock_init(&virtscsi_vq->vq_lock);
|
|
|
|
virtscsi_vq->vq = vq;
|
|
|
|
}
|
|
|
|
|
2012-06-13 08:56:34 -06:00
|
|
|
static struct virtio_scsi_target_state *virtscsi_alloc_tgt(
|
|
|
|
struct virtio_device *vdev, int sg_elems)
|
|
|
|
{
|
|
|
|
struct virtio_scsi_target_state *tgt;
|
|
|
|
gfp_t gfp_mask = GFP_KERNEL;
|
|
|
|
|
|
|
|
/* We need extra sg elements at head and tail. */
|
|
|
|
tgt = kmalloc(sizeof(*tgt) + sizeof(tgt->sg[0]) * (sg_elems + 2),
|
|
|
|
gfp_mask);
|
|
|
|
|
|
|
|
if (!tgt)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
spin_lock_init(&tgt->tgt_lock);
|
|
|
|
sg_init_table(tgt->sg, sg_elems + 2);
|
|
|
|
return tgt;
|
|
|
|
}
|
|
|
|
|
2012-07-11 15:22:16 -06:00
|
|
|
static void virtscsi_scan(struct virtio_device *vdev)
|
|
|
|
{
|
|
|
|
struct Scsi_Host *shost = (struct Scsi_Host *)vdev->priv;
|
|
|
|
|
|
|
|
scsi_scan_host(shost);
|
|
|
|
}
|
|
|
|
|
2012-06-13 08:56:34 -06:00
|
|
|
static void virtscsi_remove_vqs(struct virtio_device *vdev)
|
|
|
|
{
|
|
|
|
struct Scsi_Host *sh = virtio_scsi_host(vdev);
|
|
|
|
struct virtio_scsi *vscsi = shost_priv(sh);
|
|
|
|
u32 i, num_targets;
|
|
|
|
|
|
|
|
/* Stop all the virtqueues. */
|
|
|
|
vdev->config->reset(vdev);
|
|
|
|
|
|
|
|
num_targets = sh->max_id;
|
|
|
|
for (i = 0; i < num_targets; i++) {
|
|
|
|
kfree(vscsi->tgt[i]);
|
|
|
|
vscsi->tgt[i] = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
vdev->config->del_vqs(vdev);
|
|
|
|
}
|
|
|
|
|
2012-02-05 04:16:00 -07:00
|
|
|
static int virtscsi_init(struct virtio_device *vdev,
|
2012-06-13 08:56:34 -06:00
|
|
|
struct virtio_scsi *vscsi, int num_targets)
|
2012-02-05 04:16:00 -07:00
|
|
|
{
|
|
|
|
int err;
|
|
|
|
struct virtqueue *vqs[3];
|
2012-06-13 08:56:34 -06:00
|
|
|
u32 i, sg_elems;
|
|
|
|
|
2012-02-05 04:16:00 -07:00
|
|
|
vq_callback_t *callbacks[] = {
|
|
|
|
virtscsi_ctrl_done,
|
|
|
|
virtscsi_event_done,
|
|
|
|
virtscsi_req_done
|
|
|
|
};
|
|
|
|
const char *names[] = {
|
|
|
|
"control",
|
|
|
|
"event",
|
|
|
|
"request"
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Discover virtqueues and write information to configuration. */
|
|
|
|
err = vdev->config->find_vqs(vdev, 3, vqs, callbacks, names);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
2012-06-13 08:56:32 -06:00
|
|
|
virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]);
|
|
|
|
virtscsi_init_vq(&vscsi->event_vq, vqs[1]);
|
|
|
|
virtscsi_init_vq(&vscsi->req_vq, vqs[2]);
|
2012-02-05 04:16:00 -07:00
|
|
|
|
|
|
|
virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE);
|
|
|
|
virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE);
|
2012-06-13 08:56:34 -06:00
|
|
|
|
2012-07-05 03:06:43 -06:00
|
|
|
if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG))
|
|
|
|
virtscsi_kick_event_all(vscsi);
|
|
|
|
|
2012-06-13 08:56:34 -06:00
|
|
|
/* We need to know how many segments before we allocate. */
|
|
|
|
sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1;
|
|
|
|
|
|
|
|
for (i = 0; i < num_targets; i++) {
|
|
|
|
vscsi->tgt[i] = virtscsi_alloc_tgt(vdev, sg_elems);
|
|
|
|
if (!vscsi->tgt[i]) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
err = 0;
|
|
|
|
|
|
|
|
out:
|
|
|
|
if (err)
|
|
|
|
virtscsi_remove_vqs(vdev);
|
|
|
|
return err;
|
2012-02-05 04:16:00 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
static int __devinit virtscsi_probe(struct virtio_device *vdev)
|
|
|
|
{
|
|
|
|
struct Scsi_Host *shost;
|
|
|
|
struct virtio_scsi *vscsi;
|
|
|
|
int err;
|
2012-06-13 08:56:34 -06:00
|
|
|
u32 sg_elems, num_targets;
|
2012-02-05 04:16:00 -07:00
|
|
|
u32 cmd_per_lun;
|
|
|
|
|
|
|
|
/* Allocate memory and link the structs together. */
|
2012-06-13 08:56:34 -06:00
|
|
|
num_targets = virtscsi_config_get(vdev, max_target) + 1;
|
2012-02-05 04:16:00 -07:00
|
|
|
shost = scsi_host_alloc(&virtscsi_host_template,
|
2012-06-13 08:56:34 -06:00
|
|
|
sizeof(*vscsi)
|
|
|
|
+ num_targets * sizeof(struct virtio_scsi_target_state));
|
2012-02-05 04:16:00 -07:00
|
|
|
|
|
|
|
if (!shost)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2012-06-13 08:56:34 -06:00
|
|
|
sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1;
|
2012-02-05 04:16:00 -07:00
|
|
|
shost->sg_tablesize = sg_elems;
|
|
|
|
vscsi = shost_priv(shost);
|
|
|
|
vscsi->vdev = vdev;
|
|
|
|
vdev->priv = shost;
|
|
|
|
|
2012-06-13 08:56:34 -06:00
|
|
|
err = virtscsi_init(vdev, vscsi, num_targets);
|
2012-02-05 04:16:00 -07:00
|
|
|
if (err)
|
|
|
|
goto virtscsi_init_failed;
|
|
|
|
|
|
|
|
cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1;
|
|
|
|
shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue);
|
|
|
|
shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF;
|
2012-10-02 09:25:47 -06:00
|
|
|
|
|
|
|
/* LUNs > 256 are reported with format 1, so they go in the range
|
|
|
|
* 16640-32767.
|
|
|
|
*/
|
|
|
|
shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000;
|
2012-06-13 08:56:34 -06:00
|
|
|
shost->max_id = num_targets;
|
2012-02-05 04:16:00 -07:00
|
|
|
shost->max_channel = 0;
|
|
|
|
shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE;
|
|
|
|
err = scsi_add_host(shost, &vdev->dev);
|
|
|
|
if (err)
|
|
|
|
goto scsi_add_host_failed;
|
2012-07-11 15:22:16 -06:00
|
|
|
/*
|
|
|
|
* scsi_scan_host() happens in virtscsi_scan() via virtio_driver->scan()
|
|
|
|
* after VIRTIO_CONFIG_S_DRIVER_OK has been set..
|
|
|
|
*/
|
2012-02-05 04:16:00 -07:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
scsi_add_host_failed:
|
|
|
|
vdev->config->del_vqs(vdev);
|
|
|
|
virtscsi_init_failed:
|
|
|
|
scsi_host_put(shost);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __devexit virtscsi_remove(struct virtio_device *vdev)
|
|
|
|
{
|
|
|
|
struct Scsi_Host *shost = virtio_scsi_host(vdev);
|
2012-07-05 03:06:43 -06:00
|
|
|
struct virtio_scsi *vscsi = shost_priv(shost);
|
|
|
|
|
|
|
|
if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG))
|
|
|
|
virtscsi_cancel_event_work(vscsi);
|
2012-02-05 04:16:00 -07:00
|
|
|
|
|
|
|
scsi_remove_host(shost);
|
|
|
|
|
|
|
|
virtscsi_remove_vqs(vdev);
|
|
|
|
scsi_host_put(shost);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int virtscsi_freeze(struct virtio_device *vdev)
|
|
|
|
{
|
|
|
|
virtscsi_remove_vqs(vdev);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int virtscsi_restore(struct virtio_device *vdev)
|
|
|
|
{
|
|
|
|
struct Scsi_Host *sh = virtio_scsi_host(vdev);
|
|
|
|
struct virtio_scsi *vscsi = shost_priv(sh);
|
|
|
|
|
2012-06-13 08:56:34 -06:00
|
|
|
return virtscsi_init(vdev, vscsi, sh->max_id);
|
2012-02-05 04:16:00 -07:00
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static struct virtio_device_id id_table[] = {
|
|
|
|
{ VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID },
|
|
|
|
{ 0 },
|
|
|
|
};
|
|
|
|
|
2012-07-05 03:06:43 -06:00
|
|
|
static unsigned int features[] = {
|
2012-10-02 09:25:48 -06:00
|
|
|
VIRTIO_SCSI_F_HOTPLUG,
|
|
|
|
VIRTIO_SCSI_F_CHANGE,
|
2012-07-05 03:06:43 -06:00
|
|
|
};
|
|
|
|
|
2012-02-05 04:16:00 -07:00
|
|
|
static struct virtio_driver virtio_scsi_driver = {
|
2012-07-05 03:06:43 -06:00
|
|
|
.feature_table = features,
|
|
|
|
.feature_table_size = ARRAY_SIZE(features),
|
2012-02-05 04:16:00 -07:00
|
|
|
.driver.name = KBUILD_MODNAME,
|
|
|
|
.driver.owner = THIS_MODULE,
|
|
|
|
.id_table = id_table,
|
|
|
|
.probe = virtscsi_probe,
|
2012-07-11 15:22:16 -06:00
|
|
|
.scan = virtscsi_scan,
|
2012-02-05 04:16:00 -07:00
|
|
|
#ifdef CONFIG_PM
|
|
|
|
.freeze = virtscsi_freeze,
|
|
|
|
.restore = virtscsi_restore,
|
|
|
|
#endif
|
|
|
|
.remove = __devexit_p(virtscsi_remove),
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init init(void)
|
|
|
|
{
|
|
|
|
int ret = -ENOMEM;
|
|
|
|
|
|
|
|
virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0);
|
|
|
|
if (!virtscsi_cmd_cache) {
|
|
|
|
printk(KERN_ERR "kmem_cache_create() for "
|
|
|
|
"virtscsi_cmd_cache failed\n");
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
virtscsi_cmd_pool =
|
|
|
|
mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ,
|
|
|
|
virtscsi_cmd_cache);
|
|
|
|
if (!virtscsi_cmd_pool) {
|
|
|
|
printk(KERN_ERR "mempool_create() for"
|
|
|
|
"virtscsi_cmd_pool failed\n");
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
ret = register_virtio_driver(&virtio_scsi_driver);
|
|
|
|
if (ret < 0)
|
|
|
|
goto error;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error:
|
|
|
|
if (virtscsi_cmd_pool) {
|
|
|
|
mempool_destroy(virtscsi_cmd_pool);
|
|
|
|
virtscsi_cmd_pool = NULL;
|
|
|
|
}
|
|
|
|
if (virtscsi_cmd_cache) {
|
|
|
|
kmem_cache_destroy(virtscsi_cmd_cache);
|
|
|
|
virtscsi_cmd_cache = NULL;
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit fini(void)
|
|
|
|
{
|
|
|
|
unregister_virtio_driver(&virtio_scsi_driver);
|
|
|
|
mempool_destroy(virtscsi_cmd_pool);
|
|
|
|
kmem_cache_destroy(virtscsi_cmd_cache);
|
|
|
|
}
|
|
|
|
module_init(init);
|
|
|
|
module_exit(fini);
|
|
|
|
|
|
|
|
MODULE_DEVICE_TABLE(virtio, id_table);
|
|
|
|
MODULE_DESCRIPTION("Virtio SCSI HBA driver");
|
|
|
|
MODULE_LICENSE("GPL");
|