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freebsd-dev/sys/cam/scsi/scsi_sg.c

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/*-
* Copyright (c) 2007 Scott Long
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification, immediately at the beginning of the file.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* scsi_sg peripheral driver. This driver is meant to implement the Linux
* SG passthrough interface for SCSI.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/types.h>
#include <sys/bio.h>
#include <sys/malloc.h>
#include <sys/fcntl.h>
#include <sys/ioccom.h>
#include <sys/conf.h>
#include <sys/errno.h>
#include <sys/devicestat.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_periph.h>
#include <cam/cam_queue.h>
#include <cam/cam_xpt_periph.h>
#include <cam/cam_debug.h>
#include <cam/cam_sim.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_message.h>
#include <cam/scsi/scsi_sg.h>
#include <compat/linux/linux_ioctl.h>
typedef enum {
SG_FLAG_OPEN = 0x01,
SG_FLAG_LOCKED = 0x02,
SG_FLAG_INVALID = 0x04
} sg_flags;
typedef enum {
SG_STATE_NORMAL
} sg_state;
typedef enum {
SG_RDWR_FREE,
SG_RDWR_INPROG,
SG_RDWR_DONE
} sg_rdwr_state;
typedef enum {
SG_CCB_RDWR_IO,
SG_CCB_WAITING
} sg_ccb_types;
#define ccb_type ppriv_field0
#define ccb_rdwr ppriv_ptr1
struct sg_rdwr {
TAILQ_ENTRY(sg_rdwr) rdwr_link;
int tag;
int state;
int buf_len;
char *buf;
union ccb *ccb;
union {
struct sg_header hdr;
struct sg_io_hdr io_hdr;
} hdr;
};
struct sg_softc {
sg_state state;
sg_flags flags;
struct devstat *device_stats;
TAILQ_HEAD(, sg_rdwr) rdwr_done;
struct cdev *dev;
int sg_timeout;
int sg_user_timeout;
uint8_t pd_type;
union ccb saved_ccb;
};
static d_open_t sgopen;
static d_close_t sgclose;
static d_ioctl_t sgioctl;
static d_write_t sgwrite;
static d_read_t sgread;
static periph_init_t sginit;
static periph_ctor_t sgregister;
static periph_oninv_t sgoninvalidate;
static periph_dtor_t sgcleanup;
static periph_start_t sgstart;
static void sgasync(void *callback_arg, uint32_t code,
struct cam_path *path, void *arg);
static void sgdone(struct cam_periph *periph, union ccb *done_ccb);
static int sgsendccb(struct cam_periph *periph, union ccb *ccb);
static int sgsendrdwr(struct cam_periph *periph, union ccb *ccb);
static int sgerror(union ccb *ccb, uint32_t cam_flags,
uint32_t sense_flags);
static void sg_scsiio_status(struct ccb_scsiio *csio,
u_short *hoststat, u_short *drvstat);
static int scsi_group_len(u_char cmd);
static struct periph_driver sgdriver =
{
sginit, "sg",
TAILQ_HEAD_INITIALIZER(sgdriver.units), /* gen */ 0
};
PERIPHDRIVER_DECLARE(sg, sgdriver);
static struct cdevsw sg_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = sgopen,
.d_close = sgclose,
.d_ioctl = sgioctl,
.d_write = sgwrite,
.d_read = sgread,
.d_name = "sg",
};
static int sg_version = 30125;
static void
sginit(void)
{
cam_status status;
/*
* Install a global async callback. This callback will receive aync
* callbacks like "new device found".
*/
status = xpt_register_async(AC_FOUND_DEVICE, sgasync, NULL, NULL);
if (status != CAM_REQ_CMP) {
printf("sg: Failed to attach master async callbac "
"due to status 0x%x!\n", status);
}
}
static void
sgoninvalidate(struct cam_periph *periph)
{
struct sg_softc *softc;
softc = (struct sg_softc *)periph->softc;
/*
* Deregister any async callbacks.
*/
xpt_register_async(0, sgasync, periph, periph->path);
softc->flags |= SG_FLAG_INVALID;
/*
* XXX Return all queued I/O with ENXIO.
* XXX Handle any transactions queued to the card
* with XPT_ABORT_CCB.
*/
if (bootverbose) {
xpt_print(periph->path, "lost device\n");
}
}
static void
sgcleanup(struct cam_periph *periph)
{
struct sg_softc *softc;
softc = (struct sg_softc *)periph->softc;
if (bootverbose)
xpt_print(periph->path, "removing device entry\n");
devstat_remove_entry(softc->device_stats);
cam_periph_unlock(periph);
destroy_dev(softc->dev);
cam_periph_lock(periph);
free(softc, M_DEVBUF);
}
static void
sgasync(void *callback_arg, uint32_t code, struct cam_path *path, void *arg)
{
struct cam_periph *periph;
periph = (struct cam_periph *)callback_arg;
switch (code) {
case AC_FOUND_DEVICE:
{
struct ccb_getdev *cgd;
cam_status status;
cgd = (struct ccb_getdev *)arg;
if (cgd == NULL)
break;
if (cgd->protocol != PROTO_SCSI)
break;
/*
* Allocate a peripheral instance for this device and
* start the probe process.
*/
status = cam_periph_alloc(sgregister, sgoninvalidate,
sgcleanup, sgstart, "sg",
CAM_PERIPH_BIO, cgd->ccb_h.path,
sgasync, AC_FOUND_DEVICE, cgd);
if ((status != CAM_REQ_CMP) && (status != CAM_REQ_INPROG)) {
const struct cam_status_entry *entry;
entry = cam_fetch_status_entry(status);
printf("sgasync: Unable to attach new device "
"due to status %#x: %s\n", status, entry ?
entry->status_text : "Unknown");
}
break;
}
default:
cam_periph_async(periph, code, path, arg);
break;
}
}
static cam_status
sgregister(struct cam_periph *periph, void *arg)
{
struct sg_softc *softc;
struct ccb_getdev *cgd;
struct ccb_pathinq cpi;
int no_tags;
cgd = (struct ccb_getdev *)arg;
if (periph == NULL) {
printf("sgregister: periph was NULL!!\n");
return (CAM_REQ_CMP_ERR);
}
if (cgd == NULL) {
printf("sgregister: no getdev CCB, can't register device\n");
return (CAM_REQ_CMP_ERR);
}
softc = malloc(sizeof(*softc), M_DEVBUF, M_ZERO | M_NOWAIT);
if (softc == NULL) {
printf("sgregister: Unable to allocate softc\n");
return (CAM_REQ_CMP_ERR);
}
softc->state = SG_STATE_NORMAL;
softc->pd_type = SID_TYPE(&cgd->inq_data);
softc->sg_timeout = SG_DEFAULT_TIMEOUT / SG_DEFAULT_HZ * hz;
softc->sg_user_timeout = SG_DEFAULT_TIMEOUT;
TAILQ_INIT(&softc->rdwr_done);
periph->softc = softc;
bzero(&cpi, sizeof(cpi));
xpt_setup_ccb(&cpi.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
cpi.ccb_h.func_code = XPT_PATH_INQ;
xpt_action((union ccb *)&cpi);
/*
* We pass in 0 for all blocksize, since we don't know what the
* blocksize of the device is, if it even has a blocksize.
*/
cam_periph_unlock(periph);
no_tags = (cgd->inq_data.flags & SID_CmdQue) == 0;
softc->device_stats = devstat_new_entry("sg",
periph->unit_number, 0,
DEVSTAT_NO_BLOCKSIZE
| (no_tags ? DEVSTAT_NO_ORDERED_TAGS : 0),
softc->pd_type |
XPORT_DEVSTAT_TYPE(cpi.transport) |
DEVSTAT_TYPE_PASS,
DEVSTAT_PRIORITY_PASS);
/* Register the device */
softc->dev = make_dev(&sg_cdevsw, periph->unit_number,
UID_ROOT, GID_OPERATOR, 0600, "%s%d",
periph->periph_name, periph->unit_number);
if (periph->unit_number < 26) {
(void)make_dev_alias(softc->dev, "sg%c",
periph->unit_number + 'a');
} else {
(void)make_dev_alias(softc->dev, "sg%c%c",
((periph->unit_number / 26) - 1) + 'a',
(periph->unit_number % 26) + 'a');
}
cam_periph_lock(periph);
softc->dev->si_drv1 = periph;
/*
* Add as async callback so that we get
* notified if this device goes away.
*/
xpt_register_async(AC_LOST_DEVICE, sgasync, periph, periph->path);
if (bootverbose)
xpt_announce_periph(periph, NULL);
return (CAM_REQ_CMP);
}
static void
sgstart(struct cam_periph *periph, union ccb *start_ccb)
{
struct sg_softc *softc;
softc = (struct sg_softc *)periph->softc;
switch (softc->state) {
case SG_STATE_NORMAL:
start_ccb->ccb_h.ccb_type = SG_CCB_WAITING;
SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
periph_links.sle);
periph->immediate_priority = CAM_PRIORITY_NONE;
wakeup(&periph->ccb_list);
break;
}
}
static void
sgdone(struct cam_periph *periph, union ccb *done_ccb)
{
struct sg_softc *softc;
struct ccb_scsiio *csio;
softc = (struct sg_softc *)periph->softc;
csio = &done_ccb->csio;
switch (csio->ccb_h.ccb_type) {
case SG_CCB_WAITING:
/* Caller will release the CCB */
wakeup(&done_ccb->ccb_h.cbfcnp);
return;
case SG_CCB_RDWR_IO:
{
struct sg_rdwr *rdwr;
int state;
devstat_end_transaction(softc->device_stats,
csio->dxfer_len,
csio->tag_action & 0xf,
((csio->ccb_h.flags & CAM_DIR_MASK) ==
CAM_DIR_NONE) ? DEVSTAT_NO_DATA :
(csio->ccb_h.flags & CAM_DIR_OUT) ?
DEVSTAT_WRITE : DEVSTAT_READ,
NULL, NULL);
rdwr = done_ccb->ccb_h.ccb_rdwr;
state = rdwr->state;
rdwr->state = SG_RDWR_DONE;
wakeup(rdwr);
break;
}
default:
panic("unknown sg CCB type");
}
}
static int
sgopen(struct cdev *dev, int flags, int fmt, struct thread *td)
{
struct cam_periph *periph;
struct sg_softc *softc;
int error = 0;
periph = (struct cam_periph *)dev->si_drv1;
if (periph == NULL)
return (ENXIO);
/*
* Don't allow access when we're running at a high securelevel.
*/
error = securelevel_gt(td->td_ucred, 1);
if (error)
return (error);
cam_periph_lock(periph);
softc = (struct sg_softc *)periph->softc;
if (softc->flags & SG_FLAG_INVALID) {
cam_periph_unlock(periph);
return (ENXIO);
}
if ((softc->flags & SG_FLAG_OPEN) == 0) {
softc->flags |= SG_FLAG_OPEN;
cam_periph_unlock(periph);
} else {
/* Device closes aren't symmetrical, fix up the refcount. */
cam_periph_unlock(periph);
cam_periph_release(periph);
}
return (error);
}
static int
sgclose(struct cdev *dev, int flag, int fmt, struct thread *td)
{
struct cam_periph *periph;
struct sg_softc *softc;
periph = (struct cam_periph *)dev->si_drv1;
if (periph == NULL)
return (ENXIO);
cam_periph_lock(periph);
softc = (struct sg_softc *)periph->softc;
softc->flags &= ~SG_FLAG_OPEN;
cam_periph_unlock(periph);
cam_periph_release(periph);
return (0);
}
static int
sgioctl(struct cdev *dev, u_long cmd, caddr_t arg, int flag, struct thread *td)
{
union ccb *ccb;
struct ccb_scsiio *csio;
struct cam_periph *periph;
struct sg_softc *softc;
struct sg_io_hdr req;
int dir, error;
periph = (struct cam_periph *)dev->si_drv1;
if (periph == NULL)
return (ENXIO);
cam_periph_lock(periph);
softc = (struct sg_softc *)periph->softc;
error = 0;
switch (cmd) {
case LINUX_SCSI_GET_BUS_NUMBER: {
int busno;
busno = xpt_path_path_id(periph->path);
error = copyout(&busno, arg, sizeof(busno));
break;
}
case LINUX_SCSI_GET_IDLUN: {
struct scsi_idlun idlun;
struct cam_sim *sim;
idlun.dev_id = xpt_path_target_id(periph->path);
sim = xpt_path_sim(periph->path);
idlun.host_unique_id = sim->unit_number;
error = copyout(&idlun, arg, sizeof(idlun));
break;
}
case SG_GET_VERSION_NUM:
case LINUX_SG_GET_VERSION_NUM:
error = copyout(&sg_version, arg, sizeof(sg_version));
break;
case SG_SET_TIMEOUT:
case LINUX_SG_SET_TIMEOUT: {
u_int user_timeout;
error = copyin(arg, &user_timeout, sizeof(u_int));
if (error == 0) {
softc->sg_user_timeout = user_timeout;
softc->sg_timeout = user_timeout / SG_DEFAULT_HZ * hz;
}
break;
}
case SG_GET_TIMEOUT:
case LINUX_SG_GET_TIMEOUT:
/*
* The value is returned directly to the syscall.
*/
td->td_retval[0] = softc->sg_user_timeout;
error = 0;
break;
case SG_IO:
case LINUX_SG_IO:
error = copyin(arg, &req, sizeof(req));
if (error)
break;
if (req.cmd_len > IOCDBLEN) {
error = EINVAL;
break;
}
if (req.iovec_count != 0) {
error = EOPNOTSUPP;
break;
}
ccb = cam_periph_getccb(periph, CAM_PRIORITY_NORMAL);
csio = &ccb->csio;
error = copyin(req.cmdp, &csio->cdb_io.cdb_bytes,
req.cmd_len);
if (error) {
xpt_release_ccb(ccb);
break;
}
switch(req.dxfer_direction) {
case SG_DXFER_TO_DEV:
dir = CAM_DIR_OUT;
break;
case SG_DXFER_FROM_DEV:
dir = CAM_DIR_IN;
break;
case SG_DXFER_TO_FROM_DEV:
dir = CAM_DIR_IN | CAM_DIR_OUT;
break;
case SG_DXFER_NONE:
default:
dir = CAM_DIR_NONE;
break;
}
cam_fill_csio(csio,
/*retries*/1,
sgdone,
dir|CAM_DEV_QFRZDIS,
MSG_SIMPLE_Q_TAG,
req.dxferp,
req.dxfer_len,
req.mx_sb_len,
req.cmd_len,
req.timeout);
error = sgsendccb(periph, ccb);
if (error) {
req.host_status = DID_ERROR;
req.driver_status = DRIVER_INVALID;
xpt_release_ccb(ccb);
break;
}
req.status = csio->scsi_status;
req.masked_status = (csio->scsi_status >> 1) & 0x7f;
sg_scsiio_status(csio, &req.host_status, &req.driver_status);
req.resid = csio->resid;
req.duration = csio->ccb_h.timeout;
req.info = 0;
error = copyout(&req, arg, sizeof(req));
if ((error == 0) && (csio->ccb_h.status & CAM_AUTOSNS_VALID)
&& (req.sbp != NULL)) {
req.sb_len_wr = req.mx_sb_len - csio->sense_resid;
error = copyout(&csio->sense_data, req.sbp,
req.sb_len_wr);
}
xpt_release_ccb(ccb);
break;
case SG_GET_RESERVED_SIZE:
case LINUX_SG_GET_RESERVED_SIZE: {
int size = 32768;
error = copyout(&size, arg, sizeof(size));
break;
}
case SG_GET_SCSI_ID:
case LINUX_SG_GET_SCSI_ID:
{
struct sg_scsi_id id;
id.host_no = cam_sim_path(xpt_path_sim(periph->path));
id.channel = xpt_path_path_id(periph->path);
id.scsi_id = xpt_path_target_id(periph->path);
id.lun = xpt_path_lun_id(periph->path);
id.scsi_type = softc->pd_type;
id.h_cmd_per_lun = 1;
id.d_queue_depth = 1;
id.unused[0] = 0;
id.unused[1] = 0;
error = copyout(&id, arg, sizeof(id));
break;
}
case SG_EMULATED_HOST:
case SG_SET_TRANSFORM:
case SG_GET_TRANSFORM:
case SG_GET_NUM_WAITING:
case SG_SCSI_RESET:
case SG_GET_REQUEST_TABLE:
case SG_SET_KEEP_ORPHAN:
case SG_GET_KEEP_ORPHAN:
case SG_GET_ACCESS_COUNT:
case SG_SET_FORCE_LOW_DMA:
case SG_GET_LOW_DMA:
case SG_GET_SG_TABLESIZE:
case SG_SET_FORCE_PACK_ID:
case SG_GET_PACK_ID:
case SG_SET_RESERVED_SIZE:
case SG_GET_COMMAND_Q:
case SG_SET_COMMAND_Q:
case SG_SET_DEBUG:
case SG_NEXT_CMD_LEN:
case LINUX_SG_EMULATED_HOST:
case LINUX_SG_SET_TRANSFORM:
case LINUX_SG_GET_TRANSFORM:
case LINUX_SG_GET_NUM_WAITING:
case LINUX_SG_SCSI_RESET:
case LINUX_SG_GET_REQUEST_TABLE:
case LINUX_SG_SET_KEEP_ORPHAN:
case LINUX_SG_GET_KEEP_ORPHAN:
case LINUX_SG_GET_ACCESS_COUNT:
case LINUX_SG_SET_FORCE_LOW_DMA:
case LINUX_SG_GET_LOW_DMA:
case LINUX_SG_GET_SG_TABLESIZE:
case LINUX_SG_SET_FORCE_PACK_ID:
case LINUX_SG_GET_PACK_ID:
case LINUX_SG_SET_RESERVED_SIZE:
case LINUX_SG_GET_COMMAND_Q:
case LINUX_SG_SET_COMMAND_Q:
case LINUX_SG_SET_DEBUG:
case LINUX_SG_NEXT_CMD_LEN:
default:
#ifdef CAMDEBUG
printf("sgioctl: rejecting cmd 0x%lx\n", cmd);
#endif
error = ENODEV;
break;
}
cam_periph_unlock(periph);
return (error);
}
static int
sgwrite(struct cdev *dev, struct uio *uio, int ioflag)
{
union ccb *ccb;
struct cam_periph *periph;
struct ccb_scsiio *csio;
struct sg_softc *sc;
struct sg_header *hdr;
struct sg_rdwr *rdwr;
u_char cdb_cmd;
char *buf;
int error = 0, cdb_len, buf_len, dir;
periph = dev->si_drv1;
rdwr = malloc(sizeof(*rdwr), M_DEVBUF, M_WAITOK | M_ZERO);
hdr = &rdwr->hdr.hdr;
/* Copy in the header block and sanity check it */
if (uio->uio_resid < sizeof(*hdr)) {
error = EINVAL;
goto out_hdr;
}
error = uiomove(hdr, sizeof(*hdr), uio);
if (error)
goto out_hdr;
ccb = xpt_alloc_ccb();
if (ccb == NULL) {
error = ENOMEM;
goto out_hdr;
}
csio = &ccb->csio;
/*
* Copy in the CDB block. The designers of the interface didn't
* bother to provide a size for this in the header, so we have to
* figure it out ourselves.
*/
if (uio->uio_resid < 1)
goto out_ccb;
error = uiomove(&cdb_cmd, 1, uio);
if (error)
goto out_ccb;
if (hdr->twelve_byte)
cdb_len = 12;
else
cdb_len = scsi_group_len(cdb_cmd);
/*
* We've already read the first byte of the CDB and advanced the uio
* pointer. Just read the rest.
*/
csio->cdb_io.cdb_bytes[0] = cdb_cmd;
error = uiomove(&csio->cdb_io.cdb_bytes[1], cdb_len - 1, uio);
if (error)
goto out_ccb;
/*
* Now set up the data block. Again, the designers didn't bother
* to make this reliable.
*/
buf_len = uio->uio_resid;
if (buf_len != 0) {
buf = malloc(buf_len, M_DEVBUF, M_WAITOK | M_ZERO);
error = uiomove(buf, buf_len, uio);
if (error)
goto out_buf;
dir = CAM_DIR_OUT;
} else if (hdr->reply_len != 0) {
buf = malloc(hdr->reply_len, M_DEVBUF, M_WAITOK | M_ZERO);
buf_len = hdr->reply_len;
dir = CAM_DIR_IN;
} else {
buf = NULL;
buf_len = 0;
dir = CAM_DIR_NONE;
}
cam_periph_lock(periph);
sc = periph->softc;
xpt_setup_ccb(&ccb->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
cam_fill_csio(csio,
/*retries*/1,
sgdone,
dir|CAM_DEV_QFRZDIS,
MSG_SIMPLE_Q_TAG,
buf,
buf_len,
SG_MAX_SENSE,
cdb_len,
sc->sg_timeout);
/*
* Send off the command and hope that it works. This path does not
* go through sgstart because the I/O is supposed to be asynchronous.
*/
rdwr->buf = buf;
rdwr->buf_len = buf_len;
rdwr->tag = hdr->pack_id;
rdwr->ccb = ccb;
rdwr->state = SG_RDWR_INPROG;
ccb->ccb_h.ccb_rdwr = rdwr;
ccb->ccb_h.ccb_type = SG_CCB_RDWR_IO;
TAILQ_INSERT_TAIL(&sc->rdwr_done, rdwr, rdwr_link);
error = sgsendrdwr(periph, ccb);
cam_periph_unlock(periph);
return (error);
out_buf:
free(buf, M_DEVBUF);
out_ccb:
xpt_free_ccb(ccb);
out_hdr:
free(rdwr, M_DEVBUF);
return (error);
}
static int
sgread(struct cdev *dev, struct uio *uio, int ioflag)
{
struct ccb_scsiio *csio;
struct cam_periph *periph;
struct sg_softc *sc;
struct sg_header *hdr;
struct sg_rdwr *rdwr;
u_short hstat, dstat;
int error, pack_len, reply_len, pack_id;
periph = dev->si_drv1;
/* XXX The pack len field needs to be updated and written out instead
* of discarded. Not sure how to do that.
*/
uio->uio_rw = UIO_WRITE;
if ((error = uiomove(&pack_len, 4, uio)) != 0)
return (error);
if ((error = uiomove(&reply_len, 4, uio)) != 0)
return (error);
if ((error = uiomove(&pack_id, 4, uio)) != 0)
return (error);
uio->uio_rw = UIO_READ;
cam_periph_lock(periph);
sc = periph->softc;
search:
TAILQ_FOREACH(rdwr, &sc->rdwr_done, rdwr_link) {
if (rdwr->tag == pack_id)
break;
}
if ((rdwr == NULL) || (rdwr->state != SG_RDWR_DONE)) {
if (msleep(rdwr, periph->sim->mtx, PCATCH, "sgread", 0) == ERESTART)
return (EAGAIN);
goto search;
}
TAILQ_REMOVE(&sc->rdwr_done, rdwr, rdwr_link);
cam_periph_unlock(periph);
hdr = &rdwr->hdr.hdr;
csio = &rdwr->ccb->csio;
sg_scsiio_status(csio, &hstat, &dstat);
hdr->host_status = hstat;
hdr->driver_status = dstat;
hdr->target_status = csio->scsi_status >> 1;
switch (hstat) {
case DID_OK:
case DID_PASSTHROUGH:
case DID_SOFT_ERROR:
hdr->result = 0;
break;
case DID_NO_CONNECT:
case DID_BUS_BUSY:
case DID_TIME_OUT:
hdr->result = EBUSY;
break;
case DID_BAD_TARGET:
case DID_ABORT:
case DID_PARITY:
case DID_RESET:
case DID_BAD_INTR:
case DID_ERROR:
default:
hdr->result = EIO;
break;
}
if (dstat == DRIVER_SENSE) {
bcopy(&csio->sense_data, hdr->sense_buffer,
min(csio->sense_len, SG_MAX_SENSE));
#ifdef CAMDEBUG
scsi_sense_print(csio);
#endif
}
error = uiomove(&hdr->result, sizeof(*hdr) -
offsetof(struct sg_header, result), uio);
if ((error == 0) && (hdr->result == 0))
error = uiomove(rdwr->buf, rdwr->buf_len, uio);
cam_periph_lock(periph);
xpt_free_ccb(rdwr->ccb);
cam_periph_unlock(periph);
free(rdwr->buf, M_DEVBUF);
free(rdwr, M_DEVBUF);
return (error);
}
static int
sgsendccb(struct cam_periph *periph, union ccb *ccb)
{
struct sg_softc *softc;
struct cam_periph_map_info mapinfo;
int error, need_unmap = 0;
softc = periph->softc;
if (((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE)
&& (ccb->csio.data_ptr != NULL)) {
bzero(&mapinfo, sizeof(mapinfo));
/*
* cam_periph_mapmem calls into proc and vm functions that can
* sleep as well as trigger I/O, so we can't hold the lock.
* Dropping it here is reasonably safe.
*/
cam_periph_unlock(periph);
error = cam_periph_mapmem(ccb, &mapinfo);
cam_periph_lock(periph);
if (error)
return (error);
need_unmap = 1;
}
error = cam_periph_runccb(ccb,
sgerror,
CAM_RETRY_SELTO,
SF_RETRY_UA,
softc->device_stats);
if (need_unmap)
cam_periph_unmapmem(ccb, &mapinfo);
return (error);
}
static int
sgsendrdwr(struct cam_periph *periph, union ccb *ccb)
{
struct sg_softc *softc;
softc = periph->softc;
devstat_start_transaction(softc->device_stats, NULL);
xpt_action(ccb);
return (0);
}
static int
sgerror(union ccb *ccb, uint32_t cam_flags, uint32_t sense_flags)
{
struct cam_periph *periph;
struct sg_softc *softc;
periph = xpt_path_periph(ccb->ccb_h.path);
softc = (struct sg_softc *)periph->softc;
return (cam_periph_error(ccb, cam_flags, sense_flags,
&softc->saved_ccb));
}
static void
sg_scsiio_status(struct ccb_scsiio *csio, u_short *hoststat, u_short *drvstat)
{
int status;
status = csio->ccb_h.status;
switch (status & CAM_STATUS_MASK) {
case CAM_REQ_CMP:
*hoststat = DID_OK;
*drvstat = 0;
break;
case CAM_REQ_CMP_ERR:
*hoststat = DID_ERROR;
*drvstat = 0;
break;
case CAM_REQ_ABORTED:
*hoststat = DID_ABORT;
*drvstat = 0;
break;
case CAM_REQ_INVALID:
*hoststat = DID_ERROR;
*drvstat = DRIVER_INVALID;
break;
case CAM_DEV_NOT_THERE:
*hoststat = DID_BAD_TARGET;
*drvstat = 0;
break;
case CAM_SEL_TIMEOUT:
*hoststat = DID_NO_CONNECT;
*drvstat = 0;
break;
case CAM_CMD_TIMEOUT:
*hoststat = DID_TIME_OUT;
*drvstat = 0;
break;
case CAM_SCSI_STATUS_ERROR:
*hoststat = DID_ERROR;
*drvstat = 0;
break;
case CAM_SCSI_BUS_RESET:
*hoststat = DID_RESET;
*drvstat = 0;
break;
case CAM_UNCOR_PARITY:
*hoststat = DID_PARITY;
*drvstat = 0;
break;
case CAM_SCSI_BUSY:
*hoststat = DID_BUS_BUSY;
*drvstat = 0;
break;
default:
*hoststat = DID_ERROR;
*drvstat = DRIVER_ERROR;
}
if (status & CAM_AUTOSNS_VALID)
*drvstat = DRIVER_SENSE;
}
static int
scsi_group_len(u_char cmd)
{
int len[] = {6, 10, 10, 12, 12, 12, 10, 10};
int group;
group = (cmd >> 5) & 0x7;
return (len[group]);
}
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