| Current Path : /sys/cam/scsi/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/cam/scsi/scsi_pass.c |
/*-
* Copyright (c) 1997, 1998, 2000 Justin T. Gibbs.
* Copyright (c) 1997, 1998, 1999 Kenneth D. Merry.
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/cam/scsi/scsi_pass.c 237827 2012-06-29 22:28:31Z ken $");
#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/conf.h>
#include <sys/errno.h>
#include <sys/devicestat.h>
#include <sys/proc.h>
#include <sys/taskqueue.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_pass.h>
typedef enum {
PASS_FLAG_OPEN = 0x01,
PASS_FLAG_LOCKED = 0x02,
PASS_FLAG_INVALID = 0x04,
PASS_FLAG_INITIAL_PHYSPATH = 0x08
} pass_flags;
typedef enum {
PASS_STATE_NORMAL
} pass_state;
typedef enum {
PASS_CCB_BUFFER_IO,
PASS_CCB_WAITING
} pass_ccb_types;
#define ccb_type ppriv_field0
#define ccb_bp ppriv_ptr1
struct pass_softc {
pass_state state;
pass_flags flags;
u_int8_t pd_type;
union ccb saved_ccb;
struct devstat *device_stats;
struct cdev *dev;
struct cdev *alias_dev;
struct task add_physpath_task;
};
static d_open_t passopen;
static d_close_t passclose;
static d_ioctl_t passioctl;
static periph_init_t passinit;
static periph_ctor_t passregister;
static periph_oninv_t passoninvalidate;
static periph_dtor_t passcleanup;
static periph_start_t passstart;
static void pass_add_physpath(void *context, int pending);
static void passasync(void *callback_arg, u_int32_t code,
struct cam_path *path, void *arg);
static void passdone(struct cam_periph *periph,
union ccb *done_ccb);
static int passerror(union ccb *ccb, u_int32_t cam_flags,
u_int32_t sense_flags);
static int passsendccb(struct cam_periph *periph, union ccb *ccb,
union ccb *inccb);
static struct periph_driver passdriver =
{
passinit, "pass",
TAILQ_HEAD_INITIALIZER(passdriver.units), /* generation */ 0
};
PERIPHDRIVER_DECLARE(pass, passdriver);
static struct cdevsw pass_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_TRACKCLOSE,
.d_open = passopen,
.d_close = passclose,
.d_ioctl = passioctl,
.d_name = "pass",
};
static void
passinit(void)
{
cam_status status;
/*
* Install a global async callback. This callback will
* receive async callbacks like "new device found".
*/
status = xpt_register_async(AC_FOUND_DEVICE, passasync, NULL, NULL);
if (status != CAM_REQ_CMP) {
printf("pass: Failed to attach master async callback "
"due to status 0x%x!\n", status);
}
}
static void
passdevgonecb(void *arg)
{
struct cam_periph *periph;
periph = (struct cam_periph *)arg;
xpt_print(periph->path, "%s: devfs entry is gone\n", __func__);
cam_periph_release(periph);
}
static void
passoninvalidate(struct cam_periph *periph)
{
struct pass_softc *softc;
softc = (struct pass_softc *)periph->softc;
/*
* De-register any async callbacks.
*/
xpt_register_async(0, passasync, periph, periph->path);
softc->flags |= PASS_FLAG_INVALID;
/*
* Tell devfs this device has gone away, and ask for a callback
* when it has cleaned up its state.
*/
destroy_dev_sched_cb(softc->dev, passdevgonecb, periph);
/*
* 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
passcleanup(struct cam_periph *periph)
{
struct pass_softc *softc;
softc = (struct pass_softc *)periph->softc;
if (bootverbose)
xpt_print(periph->path, "removing device entry\n");
devstat_remove_entry(softc->device_stats);
cam_periph_unlock(periph);
taskqueue_drain(taskqueue_thread, &softc->add_physpath_task);
cam_periph_lock(periph);
free(softc, M_DEVBUF);
}
static void
pass_add_physpath(void *context, int pending)
{
struct cam_periph *periph;
struct pass_softc *softc;
char *physpath;
/*
* If we have one, create a devfs alias for our
* physical path.
*/
periph = context;
softc = periph->softc;
cam_periph_lock(periph);
if (periph->flags & CAM_PERIPH_INVALID) {
cam_periph_unlock(periph);
return;
}
cam_periph_unlock(periph);
physpath = malloc(MAXPATHLEN, M_DEVBUF, M_WAITOK);
if (xpt_getattr(physpath, MAXPATHLEN,
"GEOM::physpath", periph->path) == 0
&& strlen(physpath) != 0) {
make_dev_physpath_alias(MAKEDEV_WAITOK, &softc->alias_dev,
softc->dev, softc->alias_dev, physpath);
}
free(physpath, M_DEVBUF);
/*
* Now that we've made our alias, we no longer have to have a
* reference to the device.
*/
cam_periph_lock(periph);
if ((softc->flags & PASS_FLAG_INITIAL_PHYSPATH) == 0) {
softc->flags |= PASS_FLAG_INITIAL_PHYSPATH;
cam_periph_unlock(periph);
dev_rel(softc->dev);
}
else
cam_periph_unlock(periph);
}
static void
passasync(void *callback_arg, u_int32_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;
/*
* Allocate a peripheral instance for
* this device and start the probe
* process.
*/
status = cam_periph_alloc(passregister, passoninvalidate,
passcleanup, passstart, "pass",
CAM_PERIPH_BIO, cgd->ccb_h.path,
passasync, 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("passasync: Unable to attach new device "
"due to status %#x: %s\n", status, entry ?
entry->status_text : "Unknown");
}
break;
}
case AC_ADVINFO_CHANGED:
{
uintptr_t buftype;
buftype = (uintptr_t)arg;
if (buftype == CDAI_TYPE_PHYS_PATH) {
struct pass_softc *softc;
softc = (struct pass_softc *)periph->softc;
taskqueue_enqueue(taskqueue_thread,
&softc->add_physpath_task);
}
break;
}
default:
cam_periph_async(periph, code, path, arg);
break;
}
}
static cam_status
passregister(struct cam_periph *periph, void *arg)
{
struct pass_softc *softc;
struct ccb_getdev *cgd;
struct ccb_pathinq cpi;
int no_tags;
cgd = (struct ccb_getdev *)arg;
if (periph == NULL) {
printf("%s: periph was NULL!!\n", __func__);
return(CAM_REQ_CMP_ERR);
}
if (cgd == NULL) {
printf("%s: no getdev CCB, can't register device\n", __func__);
return(CAM_REQ_CMP_ERR);
}
softc = (struct pass_softc *)malloc(sizeof(*softc),
M_DEVBUF, M_NOWAIT);
if (softc == NULL) {
printf("%s: Unable to probe new device. "
"Unable to allocate softc\n", __func__);
return(CAM_REQ_CMP_ERR);
}
bzero(softc, sizeof(*softc));
softc->state = PASS_STATE_NORMAL;
if (cgd->protocol == PROTO_SCSI || cgd->protocol == PROTO_ATAPI)
softc->pd_type = SID_TYPE(&cgd->inq_data);
else if (cgd->protocol == PROTO_SATAPM)
softc->pd_type = T_ENCLOSURE;
else
softc->pd_type = T_DIRECT;
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 a blocksize, since we don't
* know what the blocksize of this device is, if
* it even has a blocksize.
*/
mtx_unlock(periph->sim->mtx);
no_tags = (cgd->inq_data.flags & SID_CmdQue) == 0;
softc->device_stats = devstat_new_entry("pass",
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);
/*
* Acquire a reference to the periph before we create the devfs
* instance for it. We'll release this reference once the devfs
* instance has been freed.
*/
if (cam_periph_acquire(periph) != CAM_REQ_CMP) {
xpt_print(periph->path, "%s: lost periph during "
"registration!\n", __func__);
mtx_lock(periph->sim->mtx);
return (CAM_REQ_CMP_ERR);
}
/* Register the device */
softc->dev = make_dev(&pass_cdevsw, periph->unit_number,
UID_ROOT, GID_OPERATOR, 0600, "%s%d",
periph->periph_name, periph->unit_number);
/*
* Now that we have made the devfs instance, hold a reference to it
* until the task queue has run to setup the physical path alias.
* That way devfs won't get rid of the device before we add our
* alias.
*/
dev_ref(softc->dev);
mtx_lock(periph->sim->mtx);
softc->dev->si_drv1 = periph;
TASK_INIT(&softc->add_physpath_task, /*priority*/0,
pass_add_physpath, periph);
/*
* See if physical path information is already available.
*/
taskqueue_enqueue(taskqueue_thread, &softc->add_physpath_task);
/*
* Add an async callback so that we get notified if
* this device goes away or its physical path
* (stored in the advanced info data of the EDT) has
* changed.
*/
xpt_register_async(AC_LOST_DEVICE | AC_ADVINFO_CHANGED,
passasync, periph, periph->path);
if (bootverbose)
xpt_announce_periph(periph, NULL);
return(CAM_REQ_CMP);
}
static int
passopen(struct cdev *dev, int flags, int fmt, struct thread *td)
{
struct cam_periph *periph;
struct pass_softc *softc;
int error;
periph = (struct cam_periph *)dev->si_drv1;
if (cam_periph_acquire(periph) != CAM_REQ_CMP)
return (ENXIO);
cam_periph_lock(periph);
softc = (struct pass_softc *)periph->softc;
if (softc->flags & PASS_FLAG_INVALID) {
cam_periph_release_locked(periph);
cam_periph_unlock(periph);
return(ENXIO);
}
/*
* Don't allow access when we're running at a high securelevel.
*/
error = securelevel_gt(td->td_ucred, 1);
if (error) {
cam_periph_release_locked(periph);
cam_periph_unlock(periph);
return(error);
}
/*
* Only allow read-write access.
*/
if (((flags & FWRITE) == 0) || ((flags & FREAD) == 0)) {
cam_periph_release_locked(periph);
cam_periph_unlock(periph);
return(EPERM);
}
/*
* We don't allow nonblocking access.
*/
if ((flags & O_NONBLOCK) != 0) {
xpt_print(periph->path, "can't do nonblocking access\n");
cam_periph_release_locked(periph);
cam_periph_unlock(periph);
return(EINVAL);
}
cam_periph_unlock(periph);
return (error);
}
static int
passclose(struct cdev *dev, int flag, int fmt, struct thread *td)
{
struct cam_periph *periph;
periph = (struct cam_periph *)dev->si_drv1;
if (periph == NULL)
return (ENXIO);
cam_periph_release(periph);
return (0);
}
static void
passstart(struct cam_periph *periph, union ccb *start_ccb)
{
struct pass_softc *softc;
softc = (struct pass_softc *)periph->softc;
switch (softc->state) {
case PASS_STATE_NORMAL:
start_ccb->ccb_h.ccb_type = PASS_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
passdone(struct cam_periph *periph, union ccb *done_ccb)
{
struct pass_softc *softc;
struct ccb_scsiio *csio;
softc = (struct pass_softc *)periph->softc;
csio = &done_ccb->csio;
switch (csio->ccb_h.ccb_type) {
case PASS_CCB_WAITING:
/* Caller will release the CCB */
wakeup(&done_ccb->ccb_h.cbfcnp);
return;
}
xpt_release_ccb(done_ccb);
}
static int
passioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
{
struct cam_periph *periph;
struct pass_softc *softc;
int error;
periph = (struct cam_periph *)dev->si_drv1;
if (periph == NULL)
return(ENXIO);
cam_periph_lock(periph);
softc = (struct pass_softc *)periph->softc;
error = 0;
switch (cmd) {
case CAMIOCOMMAND:
{
union ccb *inccb;
union ccb *ccb;
int ccb_malloced;
inccb = (union ccb *)addr;
/*
* Some CCB types, like scan bus and scan lun can only go
* through the transport layer device.
*/
if (inccb->ccb_h.func_code & XPT_FC_XPT_ONLY) {
xpt_print(periph->path, "CCB function code %#x is "
"restricted to the XPT device\n",
inccb->ccb_h.func_code);
error = ENODEV;
break;
}
/*
* Non-immediate CCBs need a CCB from the per-device pool
* of CCBs, which is scheduled by the transport layer.
* Immediate CCBs and user-supplied CCBs should just be
* malloced.
*/
if ((inccb->ccb_h.func_code & XPT_FC_QUEUED)
&& ((inccb->ccb_h.func_code & XPT_FC_USER_CCB) == 0)) {
ccb = cam_periph_getccb(periph,
inccb->ccb_h.pinfo.priority);
ccb_malloced = 0;
} else {
ccb = xpt_alloc_ccb_nowait();
if (ccb != NULL)
xpt_setup_ccb(&ccb->ccb_h, periph->path,
inccb->ccb_h.pinfo.priority);
ccb_malloced = 1;
}
if (ccb == NULL) {
xpt_print(periph->path, "unable to allocate CCB\n");
error = ENOMEM;
break;
}
error = passsendccb(periph, ccb, inccb);
if (ccb_malloced)
xpt_free_ccb(ccb);
else
xpt_release_ccb(ccb);
break;
}
default:
error = cam_periph_ioctl(periph, cmd, addr, passerror);
break;
}
cam_periph_unlock(periph);
return(error);
}
/*
* Generally, "ccb" should be the CCB supplied by the kernel. "inccb"
* should be the CCB that is copied in from the user.
*/
static int
passsendccb(struct cam_periph *periph, union ccb *ccb, union ccb *inccb)
{
struct pass_softc *softc;
struct cam_periph_map_info mapinfo;
int error, need_unmap;
softc = (struct pass_softc *)periph->softc;
need_unmap = 0;
/*
* There are some fields in the CCB header that need to be
* preserved, the rest we get from the user.
*/
xpt_merge_ccb(ccb, inccb);
/*
* There's no way for the user to have a completion
* function, so we put our own completion function in here.
*/
ccb->ccb_h.cbfcnp = passdone;
/*
* We only attempt to map the user memory into kernel space
* if they haven't passed in a physical memory pointer,
* and if there is actually an I/O operation to perform.
* cam_periph_mapmem() supports SCSI, ATA, SMP, ADVINFO and device
* match CCBs. For the SCSI, ATA and ADVINFO CCBs, we only pass the
* CCB in if there's actually data to map. cam_periph_mapmem() will
* do the right thing, even if there isn't data to map, but since CCBs
* without data are a reasonably common occurance (e.g. test unit
* ready), it will save a few cycles if we check for it here.
*/
if (((ccb->ccb_h.flags & CAM_DATA_PHYS) == 0)
&& (((ccb->ccb_h.func_code == XPT_SCSI_IO ||
ccb->ccb_h.func_code == XPT_ATA_IO)
&& ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE))
|| (ccb->ccb_h.func_code == XPT_DEV_MATCH)
|| (ccb->ccb_h.func_code == XPT_SMP_IO)
|| ((ccb->ccb_h.func_code == XPT_DEV_ADVINFO)
&& (ccb->cdai.bufsiz > 0)))) {
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);
/*
* cam_periph_mapmem returned an error, we can't continue.
* Return the error to the user.
*/
if (error)
return(error);
/*
* We successfully mapped the memory in, so we need to
* unmap it when the transaction is done.
*/
need_unmap = 1;
}
/*
* If the user wants us to perform any error recovery, then honor
* that request. Otherwise, it's up to the user to perform any
* error recovery.
*/
cam_periph_runccb(ccb, passerror, /* cam_flags */ CAM_RETRY_SELTO,
/* sense_flags */ ((ccb->ccb_h.flags & CAM_PASS_ERR_RECOVER) ?
SF_RETRY_UA : SF_NO_RECOVERY) | SF_NO_PRINT,
softc->device_stats);
if (need_unmap != 0)
cam_periph_unmapmem(ccb, &mapinfo);
ccb->ccb_h.cbfcnp = NULL;
ccb->ccb_h.periph_priv = inccb->ccb_h.periph_priv;
bcopy(ccb, inccb, sizeof(union ccb));
return(0);
}
static int
passerror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
{
struct cam_periph *periph;
struct pass_softc *softc;
periph = xpt_path_periph(ccb->ccb_h.path);
softc = (struct pass_softc *)periph->softc;
return(cam_periph_error(ccb, cam_flags, sense_flags,
&softc->saved_ccb));
}