The code for canceling requests upon reset is already the same. Clean it up and move it to scsi-bus.c. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
535 lines
14 KiB
C
535 lines
14 KiB
C
/*
|
|
* Generic SCSI Device support
|
|
*
|
|
* Copyright (c) 2007 Bull S.A.S.
|
|
* Based on code by Paul Brook
|
|
* Based on code by Fabrice Bellard
|
|
*
|
|
* Written by Laurent Vivier <Laurent.Vivier@bull.net>
|
|
*
|
|
* This code is licenced under the LGPL.
|
|
*
|
|
*/
|
|
|
|
#include "qemu-common.h"
|
|
#include "qemu-error.h"
|
|
#include "scsi.h"
|
|
#include "blockdev.h"
|
|
|
|
#ifdef __linux__
|
|
|
|
//#define DEBUG_SCSI
|
|
|
|
#ifdef DEBUG_SCSI
|
|
#define DPRINTF(fmt, ...) \
|
|
do { printf("scsi-generic: " fmt , ## __VA_ARGS__); } while (0)
|
|
#else
|
|
#define DPRINTF(fmt, ...) do {} while(0)
|
|
#endif
|
|
|
|
#define BADF(fmt, ...) \
|
|
do { fprintf(stderr, "scsi-generic: " fmt , ## __VA_ARGS__); } while (0)
|
|
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
#include <scsi/sg.h>
|
|
#include "scsi-defs.h"
|
|
|
|
#define SCSI_SENSE_BUF_SIZE 96
|
|
|
|
#define SG_ERR_DRIVER_TIMEOUT 0x06
|
|
#define SG_ERR_DRIVER_SENSE 0x08
|
|
|
|
#ifndef MAX_UINT
|
|
#define MAX_UINT ((unsigned int)-1)
|
|
#endif
|
|
|
|
typedef struct SCSIGenericState SCSIGenericState;
|
|
|
|
typedef struct SCSIGenericReq {
|
|
SCSIRequest req;
|
|
uint8_t *buf;
|
|
int buflen;
|
|
int len;
|
|
sg_io_hdr_t io_header;
|
|
} SCSIGenericReq;
|
|
|
|
struct SCSIGenericState
|
|
{
|
|
SCSIDevice qdev;
|
|
BlockDriverState *bs;
|
|
int lun;
|
|
int driver_status;
|
|
uint8_t sensebuf[SCSI_SENSE_BUF_SIZE];
|
|
uint8_t senselen;
|
|
};
|
|
|
|
static SCSIRequest *scsi_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun)
|
|
{
|
|
SCSIRequest *req;
|
|
|
|
req = scsi_req_alloc(sizeof(SCSIGenericReq), d, tag, lun);
|
|
return req;
|
|
}
|
|
|
|
static void scsi_free_request(SCSIRequest *req)
|
|
{
|
|
SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
|
|
|
|
qemu_free(r->buf);
|
|
}
|
|
|
|
/* Helper function for command completion. */
|
|
static void scsi_command_complete(void *opaque, int ret)
|
|
{
|
|
SCSIGenericReq *r = (SCSIGenericReq *)opaque;
|
|
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, r->req.dev);
|
|
|
|
r->req.aiocb = NULL;
|
|
s->driver_status = r->io_header.driver_status;
|
|
if (s->driver_status & SG_ERR_DRIVER_SENSE)
|
|
s->senselen = r->io_header.sb_len_wr;
|
|
|
|
if (ret != 0)
|
|
r->req.status = BUSY;
|
|
else {
|
|
if (s->driver_status & SG_ERR_DRIVER_TIMEOUT) {
|
|
r->req.status = BUSY;
|
|
BADF("Driver Timeout\n");
|
|
} else if (r->io_header.status)
|
|
r->req.status = r->io_header.status;
|
|
else if (s->driver_status & SG_ERR_DRIVER_SENSE)
|
|
r->req.status = CHECK_CONDITION;
|
|
else
|
|
r->req.status = GOOD;
|
|
}
|
|
DPRINTF("Command complete 0x%p tag=0x%x status=%d\n",
|
|
r, r->req.tag, r->req.status);
|
|
|
|
scsi_req_complete(&r->req);
|
|
}
|
|
|
|
/* Cancel a pending data transfer. */
|
|
static void scsi_cancel_io(SCSIRequest *req)
|
|
{
|
|
SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
|
|
|
|
DPRINTF("Cancel tag=0x%x\n", req->tag);
|
|
if (r->req.aiocb) {
|
|
bdrv_aio_cancel(r->req.aiocb);
|
|
}
|
|
r->req.aiocb = NULL;
|
|
scsi_req_dequeue(&r->req);
|
|
}
|
|
|
|
static int execute_command(BlockDriverState *bdrv,
|
|
SCSIGenericReq *r, int direction,
|
|
BlockDriverCompletionFunc *complete)
|
|
{
|
|
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, r->req.dev);
|
|
|
|
r->io_header.interface_id = 'S';
|
|
r->io_header.dxfer_direction = direction;
|
|
r->io_header.dxferp = r->buf;
|
|
r->io_header.dxfer_len = r->buflen;
|
|
r->io_header.cmdp = r->req.cmd.buf;
|
|
r->io_header.cmd_len = r->req.cmd.len;
|
|
r->io_header.mx_sb_len = sizeof(s->sensebuf);
|
|
r->io_header.sbp = s->sensebuf;
|
|
r->io_header.timeout = MAX_UINT;
|
|
r->io_header.usr_ptr = r;
|
|
r->io_header.flags |= SG_FLAG_DIRECT_IO;
|
|
|
|
r->req.aiocb = bdrv_aio_ioctl(bdrv, SG_IO, &r->io_header, complete, r);
|
|
if (r->req.aiocb == NULL) {
|
|
BADF("execute_command: read failed !\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void scsi_read_complete(void * opaque, int ret)
|
|
{
|
|
SCSIGenericReq *r = (SCSIGenericReq *)opaque;
|
|
int len;
|
|
|
|
r->req.aiocb = NULL;
|
|
if (ret) {
|
|
DPRINTF("IO error ret %d\n", ret);
|
|
scsi_command_complete(r, ret);
|
|
return;
|
|
}
|
|
len = r->io_header.dxfer_len - r->io_header.resid;
|
|
DPRINTF("Data ready tag=0x%x len=%d\n", r->req.tag, len);
|
|
|
|
r->len = -1;
|
|
if (len == 0) {
|
|
scsi_command_complete(r, 0);
|
|
} else {
|
|
scsi_req_data(&r->req, len);
|
|
}
|
|
}
|
|
|
|
/* Read more data from scsi device into buffer. */
|
|
static void scsi_read_data(SCSIRequest *req)
|
|
{
|
|
SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
|
|
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, r->req.dev);
|
|
int ret;
|
|
|
|
DPRINTF("scsi_read_data 0x%x\n", req->tag);
|
|
if (r->len == -1) {
|
|
scsi_command_complete(r, 0);
|
|
return;
|
|
}
|
|
|
|
if (r->req.cmd.buf[0] == REQUEST_SENSE && s->driver_status & SG_ERR_DRIVER_SENSE)
|
|
{
|
|
s->senselen = MIN(r->len, s->senselen);
|
|
memcpy(r->buf, s->sensebuf, s->senselen);
|
|
r->io_header.driver_status = 0;
|
|
r->io_header.status = 0;
|
|
r->io_header.dxfer_len = s->senselen;
|
|
r->len = -1;
|
|
DPRINTF("Data ready tag=0x%x len=%d\n", r->req.tag, s->senselen);
|
|
DPRINTF("Sense: %d %d %d %d %d %d %d %d\n",
|
|
r->buf[0], r->buf[1], r->buf[2], r->buf[3],
|
|
r->buf[4], r->buf[5], r->buf[6], r->buf[7]);
|
|
scsi_req_data(&r->req, s->senselen);
|
|
return;
|
|
}
|
|
|
|
ret = execute_command(s->bs, r, SG_DXFER_FROM_DEV, scsi_read_complete);
|
|
if (ret == -1) {
|
|
scsi_command_complete(r, -EINVAL);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void scsi_write_complete(void * opaque, int ret)
|
|
{
|
|
SCSIGenericReq *r = (SCSIGenericReq *)opaque;
|
|
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, r->req.dev);
|
|
|
|
DPRINTF("scsi_write_complete() ret = %d\n", ret);
|
|
r->req.aiocb = NULL;
|
|
if (ret) {
|
|
DPRINTF("IO error\n");
|
|
scsi_command_complete(r, ret);
|
|
return;
|
|
}
|
|
|
|
if (r->req.cmd.buf[0] == MODE_SELECT && r->req.cmd.buf[4] == 12 &&
|
|
s->qdev.type == TYPE_TAPE) {
|
|
s->qdev.blocksize = (r->buf[9] << 16) | (r->buf[10] << 8) | r->buf[11];
|
|
DPRINTF("block size %d\n", s->qdev.blocksize);
|
|
}
|
|
|
|
scsi_command_complete(r, ret);
|
|
}
|
|
|
|
/* Write data to a scsi device. Returns nonzero on failure.
|
|
The transfer may complete asynchronously. */
|
|
static int scsi_write_data(SCSIRequest *req)
|
|
{
|
|
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, req->dev);
|
|
SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
|
|
int ret;
|
|
|
|
DPRINTF("scsi_write_data 0x%x\n", req->tag);
|
|
if (r->len == 0) {
|
|
r->len = r->buflen;
|
|
scsi_req_data(&r->req, r->len);
|
|
return 0;
|
|
}
|
|
|
|
ret = execute_command(s->bs, r, SG_DXFER_TO_DEV, scsi_write_complete);
|
|
if (ret == -1) {
|
|
scsi_command_complete(r, -EINVAL);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Return a pointer to the data buffer. */
|
|
static uint8_t *scsi_get_buf(SCSIRequest *req)
|
|
{
|
|
SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
|
|
|
|
return r->buf;
|
|
}
|
|
|
|
static void scsi_req_fixup(SCSIRequest *req)
|
|
{
|
|
switch(req->cmd.buf[0]) {
|
|
case WRITE_10:
|
|
req->cmd.buf[1] &= ~0x08; /* disable FUA */
|
|
break;
|
|
case READ_10:
|
|
req->cmd.buf[1] &= ~0x08; /* disable FUA */
|
|
break;
|
|
case REWIND:
|
|
case START_STOP:
|
|
if (req->dev->type == TYPE_TAPE) {
|
|
/* force IMMED, otherwise qemu waits end of command */
|
|
req->cmd.buf[1] = 0x01;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Execute a scsi command. Returns the length of the data expected by the
|
|
command. This will be Positive for data transfers from the device
|
|
(eg. disk reads), negative for transfers to the device (eg. disk writes),
|
|
and zero if the command does not transfer any data. */
|
|
|
|
static int32_t scsi_send_command(SCSIRequest *req, uint8_t *cmd)
|
|
{
|
|
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, req->dev);
|
|
SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
|
|
SCSIBus *bus;
|
|
int ret;
|
|
|
|
scsi_req_enqueue(req);
|
|
if (cmd[0] != REQUEST_SENSE &&
|
|
(req->lun != s->lun || (cmd[1] >> 5) != s->lun)) {
|
|
DPRINTF("Unimplemented LUN %d\n", req->lun ? req->lun : cmd[1] >> 5);
|
|
|
|
s->sensebuf[0] = 0x70;
|
|
s->sensebuf[1] = 0x00;
|
|
s->sensebuf[2] = ILLEGAL_REQUEST;
|
|
s->sensebuf[3] = 0x00;
|
|
s->sensebuf[4] = 0x00;
|
|
s->sensebuf[5] = 0x00;
|
|
s->sensebuf[6] = 0x00;
|
|
s->senselen = 7;
|
|
s->driver_status = SG_ERR_DRIVER_SENSE;
|
|
bus = scsi_bus_from_device(&s->qdev);
|
|
bus->ops->complete(req, SCSI_REASON_DONE, CHECK_CONDITION);
|
|
return 0;
|
|
}
|
|
|
|
if (-1 == scsi_req_parse(&r->req, cmd)) {
|
|
BADF("Unsupported command length, command %x\n", cmd[0]);
|
|
scsi_req_dequeue(&r->req);
|
|
scsi_req_unref(&r->req);
|
|
return 0;
|
|
}
|
|
scsi_req_fixup(&r->req);
|
|
|
|
DPRINTF("Command: lun=%d tag=0x%x len %zd data=0x%02x", lun, tag,
|
|
r->req.cmd.xfer, cmd[0]);
|
|
|
|
#ifdef DEBUG_SCSI
|
|
{
|
|
int i;
|
|
for (i = 1; i < r->req.cmd.len; i++) {
|
|
printf(" 0x%02x", cmd[i]);
|
|
}
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
|
|
if (r->req.cmd.xfer == 0) {
|
|
if (r->buf != NULL)
|
|
qemu_free(r->buf);
|
|
r->buflen = 0;
|
|
r->buf = NULL;
|
|
ret = execute_command(s->bs, r, SG_DXFER_NONE, scsi_command_complete);
|
|
if (ret == -1) {
|
|
scsi_command_complete(r, -EINVAL);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if (r->buflen != r->req.cmd.xfer) {
|
|
if (r->buf != NULL)
|
|
qemu_free(r->buf);
|
|
r->buf = qemu_malloc(r->req.cmd.xfer);
|
|
r->buflen = r->req.cmd.xfer;
|
|
}
|
|
|
|
memset(r->buf, 0, r->buflen);
|
|
r->len = r->req.cmd.xfer;
|
|
if (r->req.cmd.mode == SCSI_XFER_TO_DEV) {
|
|
r->len = 0;
|
|
return -r->req.cmd.xfer;
|
|
} else {
|
|
return r->req.cmd.xfer;
|
|
}
|
|
}
|
|
|
|
static int get_blocksize(BlockDriverState *bdrv)
|
|
{
|
|
uint8_t cmd[10];
|
|
uint8_t buf[8];
|
|
uint8_t sensebuf[8];
|
|
sg_io_hdr_t io_header;
|
|
int ret;
|
|
|
|
memset(cmd, 0, sizeof(cmd));
|
|
memset(buf, 0, sizeof(buf));
|
|
cmd[0] = READ_CAPACITY;
|
|
|
|
memset(&io_header, 0, sizeof(io_header));
|
|
io_header.interface_id = 'S';
|
|
io_header.dxfer_direction = SG_DXFER_FROM_DEV;
|
|
io_header.dxfer_len = sizeof(buf);
|
|
io_header.dxferp = buf;
|
|
io_header.cmdp = cmd;
|
|
io_header.cmd_len = sizeof(cmd);
|
|
io_header.mx_sb_len = sizeof(sensebuf);
|
|
io_header.sbp = sensebuf;
|
|
io_header.timeout = 6000; /* XXX */
|
|
|
|
ret = bdrv_ioctl(bdrv, SG_IO, &io_header);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
return (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7];
|
|
}
|
|
|
|
static int get_stream_blocksize(BlockDriverState *bdrv)
|
|
{
|
|
uint8_t cmd[6];
|
|
uint8_t buf[12];
|
|
uint8_t sensebuf[8];
|
|
sg_io_hdr_t io_header;
|
|
int ret;
|
|
|
|
memset(cmd, 0, sizeof(cmd));
|
|
memset(buf, 0, sizeof(buf));
|
|
cmd[0] = MODE_SENSE;
|
|
cmd[4] = sizeof(buf);
|
|
|
|
memset(&io_header, 0, sizeof(io_header));
|
|
io_header.interface_id = 'S';
|
|
io_header.dxfer_direction = SG_DXFER_FROM_DEV;
|
|
io_header.dxfer_len = sizeof(buf);
|
|
io_header.dxferp = buf;
|
|
io_header.cmdp = cmd;
|
|
io_header.cmd_len = sizeof(cmd);
|
|
io_header.mx_sb_len = sizeof(sensebuf);
|
|
io_header.sbp = sensebuf;
|
|
io_header.timeout = 6000; /* XXX */
|
|
|
|
ret = bdrv_ioctl(bdrv, SG_IO, &io_header);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
return (buf[9] << 16) | (buf[10] << 8) | buf[11];
|
|
}
|
|
|
|
static void scsi_generic_reset(DeviceState *dev)
|
|
{
|
|
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev.qdev, dev);
|
|
|
|
scsi_device_purge_requests(&s->qdev);
|
|
}
|
|
|
|
static void scsi_destroy(SCSIDevice *d)
|
|
{
|
|
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, d);
|
|
|
|
scsi_device_purge_requests(&s->qdev);
|
|
blockdev_mark_auto_del(s->qdev.conf.bs);
|
|
}
|
|
|
|
static int scsi_generic_initfn(SCSIDevice *dev)
|
|
{
|
|
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, dev);
|
|
int sg_version;
|
|
struct sg_scsi_id scsiid;
|
|
|
|
if (!s->qdev.conf.bs) {
|
|
error_report("scsi-generic: drive property not set");
|
|
return -1;
|
|
}
|
|
s->bs = s->qdev.conf.bs;
|
|
|
|
/* check we are really using a /dev/sg* file */
|
|
if (!bdrv_is_sg(s->bs)) {
|
|
error_report("scsi-generic: not /dev/sg*");
|
|
return -1;
|
|
}
|
|
|
|
if (bdrv_get_on_error(s->bs, 0) != BLOCK_ERR_STOP_ENOSPC) {
|
|
error_report("Device doesn't support drive option werror");
|
|
return -1;
|
|
}
|
|
if (bdrv_get_on_error(s->bs, 1) != BLOCK_ERR_REPORT) {
|
|
error_report("Device doesn't support drive option rerror");
|
|
return -1;
|
|
}
|
|
|
|
/* check we are using a driver managing SG_IO (version 3 and after */
|
|
if (bdrv_ioctl(s->bs, SG_GET_VERSION_NUM, &sg_version) < 0 ||
|
|
sg_version < 30000) {
|
|
error_report("scsi-generic: scsi generic interface too old");
|
|
return -1;
|
|
}
|
|
|
|
/* get LUN of the /dev/sg? */
|
|
if (bdrv_ioctl(s->bs, SG_GET_SCSI_ID, &scsiid)) {
|
|
error_report("scsi-generic: SG_GET_SCSI_ID ioctl failed");
|
|
return -1;
|
|
}
|
|
|
|
/* define device state */
|
|
s->lun = scsiid.lun;
|
|
DPRINTF("LUN %d\n", s->lun);
|
|
s->qdev.type = scsiid.scsi_type;
|
|
DPRINTF("device type %d\n", s->qdev.type);
|
|
if (s->qdev.type == TYPE_TAPE) {
|
|
s->qdev.blocksize = get_stream_blocksize(s->bs);
|
|
if (s->qdev.blocksize == -1)
|
|
s->qdev.blocksize = 0;
|
|
} else {
|
|
s->qdev.blocksize = get_blocksize(s->bs);
|
|
/* removable media returns 0 if not present */
|
|
if (s->qdev.blocksize <= 0) {
|
|
if (s->qdev.type == TYPE_ROM || s->qdev.type == TYPE_WORM)
|
|
s->qdev.blocksize = 2048;
|
|
else
|
|
s->qdev.blocksize = 512;
|
|
}
|
|
}
|
|
DPRINTF("block size %d\n", s->qdev.blocksize);
|
|
s->driver_status = 0;
|
|
memset(s->sensebuf, 0, sizeof(s->sensebuf));
|
|
bdrv_set_removable(s->bs, 0);
|
|
return 0;
|
|
}
|
|
|
|
static SCSIDeviceInfo scsi_generic_info = {
|
|
.qdev.name = "scsi-generic",
|
|
.qdev.desc = "pass through generic scsi device (/dev/sg*)",
|
|
.qdev.size = sizeof(SCSIGenericState),
|
|
.qdev.reset = scsi_generic_reset,
|
|
.init = scsi_generic_initfn,
|
|
.destroy = scsi_destroy,
|
|
.alloc_req = scsi_new_request,
|
|
.free_req = scsi_free_request,
|
|
.send_command = scsi_send_command,
|
|
.read_data = scsi_read_data,
|
|
.write_data = scsi_write_data,
|
|
.cancel_io = scsi_cancel_io,
|
|
.get_buf = scsi_get_buf,
|
|
.qdev.props = (Property[]) {
|
|
DEFINE_BLOCK_PROPERTIES(SCSIGenericState, qdev.conf),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
},
|
|
};
|
|
|
|
static void scsi_generic_register_devices(void)
|
|
{
|
|
scsi_qdev_register(&scsi_generic_info);
|
|
}
|
|
device_init(scsi_generic_register_devices)
|
|
|
|
#endif /* __linux__ */
|