d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
ad2692aed9
freebsd-skq/sys/cam/scsi/scsi_enc.c
ken 188f5a2133 Fix several reference counting and object lifetime issues between 
the pass(4) and enc(4) drivers and devfs.

The pass(4) driver uses the destroy_dev_sched() routine to
schedule its device node for destruction in a separate thread
context.  It does this because the passcleanup() routine can get
called indirectly from the passclose() routine, and that would
cause a deadlock if the close routine tried to destroy its own
device node.

In any case, once a particular passthrough driver number, e.g.
pass3, is destroyed, CAM considers that unit number (3 in this
case) available for reuse.

The problem is that devfs may not be done cleaning up the previous
instance of pass3, and will panic if isn't done cleaning up the
previous instance.

The solution is to get a callback from devfs when the device node
is removed, and make sure we hold a reference to the peripheral
until that happens.

Testing exposed some other cases where we have reference counting
issues, and those were also fixed in the pass(4) driver.

cam_periph.c:	In camperiphfree(), reorder some of the operations.

		The peripheral destructor needs to be called before
		the peripheral is removed from the peripheral is
		removed from the list.  This is because once we
		remove the peripheral from the list, and drop the
		topology lock, the peripheral number may be reused.
		But if the destructor hasn't been called yet, there
		may still be resources hanging around (like devfs
		nodes) that haven't been fully cleaned up.

cam_xpt.c:	Add an argument to xpt_remove_periph() to indicate
		whether the topology lock is already held.

scsi_enc.c:	Acquire an extra reference to the peripheral during
		registration, and release it once we get a callback
		from devfs indicating that the device node is gone.

		Call destroy_dev_sched_cb() in enc_oninvalidate()
		instead of calling destroy_dev() in the cleanup
		routine.

scsi_pass.c:	Add reference counting to handle peripheral and
		devfs object lifetime issues.

		Add a reference to the peripheral and the devfs
		node in the peripheral registration.

		Don't attempt to add a physical path alias if the
		peripheral has been marked invalid.

		Release the devfs reference once the initial
		physical path alias taskqueue run has completed.

		Schedule devfs node destruction in the
		passoninvalidate(), and release our peripheral
		reference in a new routine, passdevgonecb() once
		the devfs node is gone.  This allows the peripheral
		to fully go away, and the peripheral destructor,
		passcleanup(), will get called.

MFC after:	3 days
Sponsored by:	Spectra Logic
2012-06-20 17:08:00 +00:00

1024 lines
23 KiB
C
Raw Blame History

/*-
* Copyright (c) 2000 Matthew Jacob
* 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#include <sys/sx.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <machine/stdarg.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_debug.h>
#include <cam/cam_periph.h>
#include <cam/cam_xpt_periph.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_message.h>
#include <cam/scsi/scsi_enc.h>
#include <cam/scsi/scsi_enc_internal.h>
#include <opt_enc.h>
MALLOC_DEFINE(M_SCSIENC, "SCSI ENC", "SCSI ENC buffers");
/* Enclosure type independent driver */
#define SEN_ID "UNISYS SUN_SEN"
#define SEN_ID_LEN 24
static d_open_t enc_open;
static d_close_t enc_close;
static d_ioctl_t enc_ioctl;
static periph_init_t enc_init;
static periph_ctor_t enc_ctor;
static periph_oninv_t enc_oninvalidate;
static periph_dtor_t enc_dtor;
static periph_start_t enc_start;
static void enc_async(void *, uint32_t, struct cam_path *, void *);
static enctyp enc_type(struct ccb_getdev *);
SYSCTL_NODE(_kern_cam, OID_AUTO, enc, CTLFLAG_RD, 0,
"CAM Enclosure Services driver");
static struct periph_driver encdriver = {
enc_init, "ses",
TAILQ_HEAD_INITIALIZER(encdriver.units), /* generation */ 0
};
PERIPHDRIVER_DECLARE(enc, encdriver);
static struct cdevsw enc_cdevsw = {
.d_version = D_VERSION,
.d_open = enc_open,
.d_close = enc_close,
.d_ioctl = enc_ioctl,
.d_name = "ses",
.d_flags = D_TRACKCLOSE,
};
static void
enc_init(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, enc_async, NULL, NULL);
if (status != CAM_REQ_CMP) {
printf("enc: Failed to attach master async callback "
"due to status 0x%x!\n", status);
}
}
static void
enc_devgonecb(void *arg)
{
struct cam_periph *periph;
periph = (struct cam_periph *)arg;
cam_periph_release(periph);
}
static void
enc_oninvalidate(struct cam_periph *periph)
{
struct enc_softc *enc;
enc = periph->softc;
enc->enc_flags |= ENC_FLAG_INVALID;
/* If the sub-driver has an invalidate routine, call it */
if (enc->enc_vec.softc_invalidate != NULL)
enc->enc_vec.softc_invalidate(enc);
/*
* Unregister any async callbacks.
*/
xpt_register_async(0, enc_async, periph, periph->path);
/*
* Shutdown our daemon.
*/
enc->enc_flags |= ENC_FLAG_SHUTDOWN;
if (enc->enc_daemon != NULL) {
/* Signal the ses daemon to terminate. */
wakeup(enc->enc_daemon);
}
callout_drain(&enc->status_updater);
destroy_dev_sched_cb(enc->enc_dev, enc_devgonecb, periph);
xpt_print(periph->path, "lost device\n");
}
static void
enc_dtor(struct cam_periph *periph)
{
struct enc_softc *enc;
enc = periph->softc;
xpt_print(periph->path, "removing device entry\n");
/* If the sub-driver has a cleanup routine, call it */
if (enc->enc_vec.softc_cleanup != NULL)
enc->enc_vec.softc_cleanup(enc);
if (enc->enc_boot_hold_ch.ich_func != NULL) {
config_intrhook_disestablish(&enc->enc_boot_hold_ch);
enc->enc_boot_hold_ch.ich_func = NULL;
}
ENC_FREE(enc);
}
static void
enc_async(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;
path_id_t path_id;
cgd = (struct ccb_getdev *)arg;
if (arg == NULL) {
break;
}
if (enc_type(cgd) == ENC_NONE) {
/*
* Schedule announcement of the ENC bindings for
* this device if it is managed by a SEP.
*/
path_id = xpt_path_path_id(path);
xpt_lock_buses();
TAILQ_FOREACH(periph, &encdriver.units, unit_links) {
struct enc_softc *softc;
softc = (struct enc_softc *)periph->softc;
if (xpt_path_path_id(periph->path) != path_id
|| softc == NULL
|| (softc->enc_flags & ENC_FLAG_INITIALIZED)
== 0
|| softc->enc_vec.device_found == NULL)
continue;
softc->enc_vec.device_found(softc);
}
xpt_unlock_buses();
return;
}
status = cam_periph_alloc(enc_ctor, enc_oninvalidate,
enc_dtor, enc_start, "ses", CAM_PERIPH_BIO,
cgd->ccb_h.path, enc_async, AC_FOUND_DEVICE, cgd);
if (status != CAM_REQ_CMP && status != CAM_REQ_INPROG) {
printf("enc_async: Unable to probe new device due to "
"status 0x%x\n", status);
}
break;
}
default:
cam_periph_async(periph, code, path, arg);
break;
}
}
static int
enc_open(struct cdev *dev, int flags, int fmt, struct thread *td)
{
struct cam_periph *periph;
struct enc_softc *softc;
int error = 0;
periph = (struct cam_periph *)dev->si_drv1;
if (periph == NULL) {
return (ENXIO);
}
if (cam_periph_acquire(periph) != CAM_REQ_CMP)
return (ENXIO);
cam_periph_lock(periph);
softc = (struct enc_softc *)periph->softc;
if ((softc->enc_flags & ENC_FLAG_INITIALIZED) == 0) {
error = ENXIO;
goto out;
}
if (softc->enc_flags & ENC_FLAG_INVALID) {
error = ENXIO;
goto out;
}
out:
if (error != 0)
cam_periph_release_locked(periph);
cam_periph_unlock(periph);
return (error);
}
static int
enc_close(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
enc_start(struct cam_periph *p, union ccb *sccb)
{
struct enc_softc *enc;
enc = p->softc;
ENC_DLOG(enc, "%s enter imm=%d prio=%d\n",
__func__, p->immediate_priority, p->pinfo.priority);
if (p->immediate_priority <= p->pinfo.priority) {
SLIST_INSERT_HEAD(&p->ccb_list, &sccb->ccb_h, periph_links.sle);
p->immediate_priority = CAM_PRIORITY_NONE;
wakeup(&p->ccb_list);
} else
xpt_release_ccb(sccb);
ENC_DLOG(enc, "%s exit\n", __func__);
}
void
enc_done(struct cam_periph *periph, union ccb *dccb)
{
wakeup(&dccb->ccb_h.cbfcnp);
}
int
enc_error(union ccb *ccb, uint32_t cflags, uint32_t sflags)
{
struct enc_softc *softc;
struct cam_periph *periph;
periph = xpt_path_periph(ccb->ccb_h.path);
softc = (struct enc_softc *)periph->softc;
return (cam_periph_error(ccb, cflags, sflags, &softc->saved_ccb));
}
static int
enc_ioctl(struct cdev *dev, u_long cmd, caddr_t arg_addr, int flag,
struct thread *td)
{
struct cam_periph *periph;
encioc_enc_status_t tmp;
encioc_string_t sstr;
encioc_elm_status_t elms;
encioc_elm_desc_t elmd;
encioc_elm_devnames_t elmdn;
encioc_element_t *uelm;
enc_softc_t *enc;
enc_cache_t *cache;
void *addr;
int error, i;
if (arg_addr)
addr = *((caddr_t *) arg_addr);
else
addr = NULL;
periph = (struct cam_periph *)dev->si_drv1;
if (periph == NULL)
return (ENXIO);
CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering encioctl\n"));
cam_periph_lock(periph);
enc = (struct enc_softc *)periph->softc;
cache = &enc->enc_cache;
/*
* Now check to see whether we're initialized or not.
* This actually should never fail as we're not supposed
* to get past enc_open w/o successfully initializing
* things.
*/
if ((enc->enc_flags & ENC_FLAG_INITIALIZED) == 0) {
cam_periph_unlock(periph);
return (ENXIO);
}
cam_periph_unlock(periph);
error = 0;
CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
("trying to do ioctl %#lx\n", cmd));
/*
* If this command can change the device's state,
* we must have the device open for writing.
*
* For commands that get information about the
* device- we don't need to lock the peripheral
* if we aren't running a command. The periph
* also can't go away while a user process has
* it open.
*/
switch (cmd) {
case ENCIOC_GETNELM:
case ENCIOC_GETELMMAP:
case ENCIOC_GETENCSTAT:
case ENCIOC_GETELMSTAT:
case ENCIOC_GETELMDESC:
case ENCIOC_GETELMDEVNAMES:
break;
default:
if ((flag & FWRITE) == 0) {
return (EBADF);
}
}
/*
* XXX The values read here are only valid for the current
* configuration generation. We need these ioctls
* to also pass in/out a generation number.
*/
sx_slock(&enc->enc_cache_lock);
switch (cmd) {
case ENCIOC_GETNELM:
error = copyout(&cache->nelms, addr, sizeof (cache->nelms));
break;
case ENCIOC_GETELMMAP:
for (uelm = addr, i = 0; i != cache->nelms; i++) {
encioc_element_t kelm;
kelm.elm_idx = i;
kelm.elm_subenc_id = cache->elm_map[i].subenclosure;
kelm.elm_type = cache->elm_map[i].enctype;
error = copyout(&kelm, &uelm[i], sizeof(kelm));
if (error)
break;
}
break;
case ENCIOC_GETENCSTAT:
cam_periph_lock(periph);
error = enc->enc_vec.get_enc_status(enc, 1);
if (error) {
cam_periph_unlock(periph);
break;
}
tmp = cache->enc_status;
cam_periph_unlock(periph);
error = copyout(&tmp, addr, sizeof(tmp));
cache->enc_status = tmp;
break;
case ENCIOC_SETENCSTAT:
error = copyin(addr, &tmp, sizeof(tmp));
if (error)
break;
cam_periph_lock(periph);
error = enc->enc_vec.set_enc_status(enc, tmp, 1);
cam_periph_unlock(periph);
break;
case ENCIOC_GETSTRING:
case ENCIOC_SETSTRING:
if (enc->enc_vec.handle_string == NULL) {
error = EINVAL;
break;
}
error = copyin(addr, &sstr, sizeof(sstr));
if (error)
break;
cam_periph_lock(periph);
error = enc->enc_vec.handle_string(enc, &sstr, cmd);
cam_periph_unlock(periph);
break;
case ENCIOC_GETELMSTAT:
error = copyin(addr, &elms, sizeof(elms));
if (error)
break;
if (elms.elm_idx >= cache->nelms) {
error = EINVAL;
break;
}
cam_periph_lock(periph);
error = enc->enc_vec.get_elm_status(enc, &elms, 1);
cam_periph_unlock(periph);
if (error)
break;
error = copyout(&elms, addr, sizeof(elms));
break;
case ENCIOC_GETELMDESC:
error = copyin(addr, &elmd, sizeof(elmd));
if (error)
break;
if (elmd.elm_idx >= cache->nelms) {
error = EINVAL;
break;
}
if (enc->enc_vec.get_elm_desc != NULL) {
error = enc->enc_vec.get_elm_desc(enc, &elmd);
if (error)
break;
} else
elmd.elm_desc_len = 0;
error = copyout(&elmd, addr, sizeof(elmd));
break;
case ENCIOC_GETELMDEVNAMES:
if (enc->enc_vec.get_elm_devnames == NULL) {
error = EINVAL;
break;
}
error = copyin(addr, &elmdn, sizeof(elmdn));
if (error)
break;
if (elmdn.elm_idx >= cache->nelms) {
error = EINVAL;
break;
}
cam_periph_lock(periph);
error = (*enc->enc_vec.get_elm_devnames)(enc, &elmdn);
cam_periph_unlock(periph);
if (error)
break;
error = copyout(&elmdn, addr, sizeof(elmdn));
break;
case ENCIOC_SETELMSTAT:
error = copyin(addr, &elms, sizeof(elms));
if (error)
break;
if (elms.elm_idx >= cache->nelms) {
error = EINVAL;
break;
}
cam_periph_lock(periph);
error = enc->enc_vec.set_elm_status(enc, &elms, 1);
cam_periph_unlock(periph);
break;
case ENCIOC_INIT:
cam_periph_lock(periph);
error = enc->enc_vec.init_enc(enc);
cam_periph_unlock(periph);
break;
default:
cam_periph_lock(periph);
error = cam_periph_ioctl(periph, cmd, arg_addr, enc_error);
cam_periph_unlock(periph);
break;
}
sx_sunlock(&enc->enc_cache_lock);
return (error);
}
int
enc_runcmd(struct enc_softc *enc, char *cdb, int cdbl, char *dptr, int *dlenp)
{
int error, dlen, tdlen;
ccb_flags ddf;
union ccb *ccb;
CAM_DEBUG(enc->periph->path, CAM_DEBUG_TRACE,
("entering enc_runcmd\n"));
if (dptr) {
if ((dlen = *dlenp) < 0) {
dlen = -dlen;
ddf = CAM_DIR_OUT;
} else {
ddf = CAM_DIR_IN;
}
} else {
dlen = 0;
ddf = CAM_DIR_NONE;
}
if (cdbl > IOCDBLEN) {
cdbl = IOCDBLEN;
}
ccb = cam_periph_getccb(enc->periph, 1);
if (enc->enc_type == ENC_SEMB_SES || enc->enc_type == ENC_SEMB_SAFT) {
tdlen = min(dlen, 1020);
tdlen = (tdlen + 3) & ~3;
cam_fill_ataio(&ccb->ataio, 0, enc_done, ddf, 0, dptr, tdlen,
30 * 1000);
if (cdb[0] == RECEIVE_DIAGNOSTIC)
ata_28bit_cmd(&ccb->ataio,
ATA_SEP_ATTN, cdb[2], 0x02, tdlen / 4);
else if (cdb[0] == SEND_DIAGNOSTIC)
ata_28bit_cmd(&ccb->ataio,
ATA_SEP_ATTN, dlen > 0 ? dptr[0] : 0,
0x82, tdlen / 4);
else if (cdb[0] == READ_BUFFER)
ata_28bit_cmd(&ccb->ataio,
ATA_SEP_ATTN, cdb[2], 0x00, tdlen / 4);
else
ata_28bit_cmd(&ccb->ataio,
ATA_SEP_ATTN, dlen > 0 ? dptr[0] : 0,
0x80, tdlen / 4);
} else {
tdlen = dlen;
cam_fill_csio(&ccb->csio, 0, enc_done, ddf, MSG_SIMPLE_Q_TAG,
dptr, dlen, sizeof (struct scsi_sense_data), cdbl,
60 * 1000);
bcopy(cdb, ccb->csio.cdb_io.cdb_bytes, cdbl);
}
error = cam_periph_runccb(ccb, enc_error, ENC_CFLAGS, ENC_FLAGS, NULL);
if (error) {
if (dptr) {
*dlenp = dlen;
}
} else {
if (dptr) {
if (ccb->ccb_h.func_code == XPT_ATA_IO)
*dlenp = ccb->ataio.resid;
else
*dlenp = ccb->csio.resid;
*dlenp += tdlen - dlen;
}
}
xpt_release_ccb(ccb);
CAM_DEBUG(enc->periph->path, CAM_DEBUG_SUBTRACE,
("exiting enc_runcmd: *dlenp = %d\n", *dlenp));
return (error);
}
void
enc_log(struct enc_softc *enc, const char *fmt, ...)
{
va_list ap;
printf("%s%d: ", enc->periph->periph_name, enc->periph->unit_number);
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
}
/*
* The code after this point runs on many platforms,
* so forgive the slightly awkward and nonconforming
* appearance.
*/
/*
* Is this a device that supports enclosure services?
*
* It's a a pretty simple ruleset- if it is device type 0x0D (13), it's
* an ENC device. If it happens to be an old UNISYS SEN device, we can
* handle that too.
*/
#define SAFTE_START 44
#define SAFTE_END 50
#define SAFTE_LEN SAFTE_END-SAFTE_START
static enctyp
enc_type(struct ccb_getdev *cgd)
{
int buflen;
unsigned char *iqd;
if (cgd->protocol == PROTO_SEMB) {
iqd = (unsigned char *)&cgd->ident_data;
if (STRNCMP(iqd + 43, "S-E-S", 5) == 0)
return (ENC_SEMB_SES);
else if (STRNCMP(iqd + 43, "SAF-TE", 6) == 0)
return (ENC_SEMB_SAFT);
return (ENC_NONE);
} else if (cgd->protocol != PROTO_SCSI)
return (ENC_NONE);
iqd = (unsigned char *)&cgd->inq_data;
buflen = min(sizeof(cgd->inq_data),
SID_ADDITIONAL_LENGTH(&cgd->inq_data));
if (buflen < 8+SEN_ID_LEN)
return (ENC_NONE);
if ((iqd[0] & 0x1f) == T_ENCLOSURE) {
if (STRNCMP(&iqd[8], SEN_ID, SEN_ID_LEN) == 0) {
return (ENC_SEN);
} else if ((iqd[2] & 0x7) > 2) {
return (ENC_SES);
} else {
return (ENC_SES_SCSI2);
}
return (ENC_NONE);
}
#ifdef ENC_ENABLE_PASSTHROUGH
if ((iqd[6] & 0x40) && (iqd[2] & 0x7) >= 2) {
/*
* PassThrough Device.
*/
return (ENC_ENC_PASSTHROUGH);
}
#endif
/*
* The comparison is short for a reason-
* some vendors were chopping it short.
*/
if (buflen < SAFTE_END - 2) {
return (ENC_NONE);
}
if (STRNCMP((char *)&iqd[SAFTE_START], "SAF-TE", SAFTE_LEN - 2) == 0) {
return (ENC_SAFT);
}
return (ENC_NONE);
}
/*================== Enclosure Monitoring/Processing Daemon ==================*/
/**
* \brief Queue an update request for a given action, if needed.
*
* \param enc SES softc to queue the request for.
* \param action Action requested.
*/
void
enc_update_request(enc_softc_t *enc, uint32_t action)
{
if ((enc->pending_actions & (0x1 << action)) == 0) {
enc->pending_actions |= (0x1 << action);
ENC_DLOG(enc, "%s: queing requested action %d\n",
__func__, action);
if (enc->current_action == ENC_UPDATE_NONE)
wakeup(enc->enc_daemon);
} else {
ENC_DLOG(enc, "%s: ignoring requested action %d - "
"Already queued\n", __func__, action);
}
}
/**
* \brief Invoke the handler of the highest priority pending
* state in the SES state machine.
*
* \param enc The SES instance invoking the state machine.
*/
static void
enc_fsm_step(enc_softc_t *enc)
{
union ccb *ccb;
uint8_t *buf;
struct enc_fsm_state *cur_state;
int error;
uint32_t xfer_len;
ENC_DLOG(enc, "%s enter %p\n", __func__, enc);
enc->current_action = ffs(enc->pending_actions) - 1;
enc->pending_actions &= ~(0x1 << enc->current_action);
cur_state = &enc->enc_fsm_states[enc->current_action];
buf = NULL;
if (cur_state->buf_size != 0) {
cam_periph_unlock(enc->periph);
buf = malloc(cur_state->buf_size, M_SCSIENC, M_WAITOK|M_ZERO);
cam_periph_lock(enc->periph);
}
error = 0;
ccb = NULL;
if (cur_state->fill != NULL) {
ccb = cam_periph_getccb(enc->periph, CAM_PRIORITY_NORMAL);
error = cur_state->fill(enc, cur_state, ccb, buf);
if (error != 0)
goto done;
error = cam_periph_runccb(ccb, cur_state->error,
ENC_CFLAGS,
ENC_FLAGS|SF_QUIET_IR, NULL);
}
if (ccb != NULL) {
if (ccb->ccb_h.func_code == XPT_ATA_IO)
xfer_len = ccb->ataio.dxfer_len - ccb->ataio.resid;
else
xfer_len = ccb->csio.dxfer_len - ccb->csio.resid;
} else
xfer_len = 0;
cam_periph_unlock(enc->periph);
cur_state->done(enc, cur_state, ccb, &buf, error, xfer_len);
cam_periph_lock(enc->periph);
done:
ENC_DLOG(enc, "%s exit - result %d\n", __func__, error);
ENC_FREE_AND_NULL(buf);
if (ccb != NULL)
xpt_release_ccb(ccb);
}
/**
* \invariant Called with cam_periph mutex held.
*/
static void
enc_status_updater(void *arg)
{
enc_softc_t *enc;
enc = arg;
if (enc->enc_vec.poll_status != NULL)
enc->enc_vec.poll_status(enc);
}
static void
enc_daemon(void *arg)
{
enc_softc_t *enc;
enc = arg;
cam_periph_lock(enc->periph);
while ((enc->enc_flags & ENC_FLAG_SHUTDOWN) == 0) {
if (enc->pending_actions == 0) {
struct intr_config_hook *hook;
/*
* Reset callout and msleep, or
* issue timed task completion
* status command.
*/
enc->current_action = ENC_UPDATE_NONE;
/*
* We've been through our state machine at least
* once. Allow the transition to userland.
*/
hook = &enc->enc_boot_hold_ch;
if (hook->ich_func != NULL) {
config_intrhook_disestablish(hook);
hook->ich_func = NULL;
}
callout_reset(&enc->status_updater, 60*hz,
enc_status_updater, enc);
cam_periph_sleep(enc->periph, enc->enc_daemon,
PUSER, "idle", 0);
} else {
enc_fsm_step(enc);
}
}
enc->enc_daemon = NULL;
cam_periph_unlock(enc->periph);
cam_periph_release(enc->periph);
kproc_exit(0);
}
static int
enc_kproc_init(enc_softc_t *enc)
{
int result;
callout_init_mtx(&enc->status_updater, enc->periph->sim->mtx, 0);
if (cam_periph_acquire(enc->periph) != CAM_REQ_CMP)
return (ENXIO);
result = kproc_create(enc_daemon, enc, &enc->enc_daemon, /*flags*/0,
/*stackpgs*/0, "enc_daemon%d",
enc->periph->unit_number);
if (result == 0) {
/* Do an initial load of all page data. */
cam_periph_lock(enc->periph);
enc->enc_vec.poll_status(enc);
cam_periph_unlock(enc->periph);
} else
cam_periph_release(enc->periph);
return (result);
}
/**
* \brief Interrupt configuration hook callback associated with
* enc_boot_hold_ch.
*
* Since interrupts are always functional at the time of enclosure
* configuration, there is nothing to be done when the callback occurs.
* This hook is only registered to hold up boot processing while initial
* eclosure processing occurs.
*
* \param arg The enclosure softc, but currently unused in this callback.
*/
static void
enc_nop_confighook_cb(void *arg __unused)
{
}
static cam_status
enc_ctor(struct cam_periph *periph, void *arg)
{
cam_status status = CAM_REQ_CMP_ERR;
int err;
enc_softc_t *enc;
struct ccb_getdev *cgd;
char *tname;
cgd = (struct ccb_getdev *)arg;
if (periph == NULL) {
printf("enc_ctor: periph was NULL!!\n");
goto out;
}
if (cgd == NULL) {
printf("enc_ctor: no getdev CCB, can't register device\n");
goto out;
}
enc = ENC_MALLOCZ(sizeof(*enc));
if (enc == NULL) {
printf("enc_ctor: Unable to probe new device. "
"Unable to allocate enc\n");
goto out;
}
enc->periph = periph;
enc->current_action = ENC_UPDATE_INVALID;
enc->enc_type = enc_type(cgd);
sx_init(&enc->enc_cache_lock, "enccache");
switch (enc->enc_type) {
case ENC_SES:
case ENC_SES_SCSI2:
case ENC_SES_PASSTHROUGH:
case ENC_SEMB_SES:
err = ses_softc_init(enc);
break;
case ENC_SAFT:
case ENC_SEMB_SAFT:
err = safte_softc_init(enc);
break;
case ENC_SEN:
case ENC_NONE:
default:
ENC_FREE(enc);
return (CAM_REQ_CMP_ERR);
}
if (err) {
xpt_print(periph->path, "error %d initializing\n", err);
goto out;
}
/*
* Hold off userland until we have made at least one pass
* through our state machine so that physical path data is
* present.
*/
if (enc->enc_vec.poll_status != NULL) {
enc->enc_boot_hold_ch.ich_func = enc_nop_confighook_cb;
enc->enc_boot_hold_ch.ich_arg = enc;
config_intrhook_establish(&enc->enc_boot_hold_ch);
}
/*
* The softc field is set only once the enc is fully initialized
* so that we can rely on this field to detect partially
* initialized periph objects in the AC_FOUND_DEVICE handler.
*/
periph->softc = enc;
cam_periph_unlock(periph);
if (enc->enc_vec.poll_status != NULL) {
err = enc_kproc_init(enc);
if (err) {
xpt_print(periph->path,
"error %d starting enc_daemon\n", err);
goto out;
}
}
if (cam_periph_acquire(periph) != CAM_REQ_CMP) {
xpt_print(periph->path, "%s: lost periph during "
"registration!\n", __func__);
cam_periph_lock(periph);
return (CAM_REQ_CMP_ERR);
}
enc->enc_dev = make_dev(&enc_cdevsw, periph->unit_number,
UID_ROOT, GID_OPERATOR, 0600, "%s%d",
periph->periph_name, periph->unit_number);
cam_periph_lock(periph);
enc->enc_dev->si_drv1 = periph;
enc->enc_flags |= ENC_FLAG_INITIALIZED;
/*
* Add an async callback so that we get notified if this
* device goes away.
*/
xpt_register_async(AC_LOST_DEVICE, enc_async, periph, periph->path);
switch (enc->enc_type) {
default:
case ENC_NONE:
tname = "No ENC device";
break;
case ENC_SES_SCSI2:
tname = "SCSI-2 ENC Device";
break;
case ENC_SES:
tname = "SCSI-3 ENC Device";
break;
case ENC_SES_PASSTHROUGH:
tname = "ENC Passthrough Device";
break;
case ENC_SEN:
tname = "UNISYS SEN Device (NOT HANDLED YET)";
break;
case ENC_SAFT:
tname = "SAF-TE Compliant Device";
break;
case ENC_SEMB_SES:
tname = "SEMB SES Device";
break;
case ENC_SEMB_SAFT:
tname = "SEMB SAF-TE Device";
break;
}
xpt_announce_periph(periph, tname);
status = CAM_REQ_CMP;
out:
if (status != CAM_REQ_CMP)
enc_dtor(periph);
return (status);
}
Reference in New Issue View Git Blame Copy Permalink