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freebsd-skq/sys/cam/cam_periph.c
ken b8327e28a3 Fix a panic during CAM EDT traversal. 
The problem was a race condition between the EDT traversal used by
things like 'camcontrol devlist', and CAM peripheral driver
removal.

The EDT traversal code holds the CAM topology lock, and wants
to show devices that have been invalidated.  It acquires a
reference to the peripheral to make sure the peripheral it is
examining doesn't go away.

However, because the peripheral removal code in camperiphfree()
drops the CAM topology lock to call the peripheral's destructor
routine, we can run into a situation where the EDT traversal
increments the peripheral reference count after free process is
already in progress.  At that point, the reference count is
ignored, because it was 0 when we started the process.

Fix this race by setting a flag, CAM_PERIPH_FREE, that I previously
added and checked in xptperiphtraverse() and xptpdperiphtravsere(),
but failed to use.  If the EDT traversal code sees that flag,
it will know that the peripheral free process has already started,
and that it should not access that peripheral.

Also, fix an inconsistency in the locking between
xptpdperiphtraverse() and xptperiphtraverse().  They now both
hold the CAM topology lock while calling the peripheral traversal
function.

cam_xpt.c:	Change xptperiphtraverse() to hold the CAM topology
		lock across calls to the traversal function.

		Take out the comment in xptpdperiphtraverse() that
		referenced the locking inconsistency.

cam_periph.c:	Set the CAM_PERIPH_FREE flag when we are in the
		process of freeing a peripheral driver.

Sponsored by:	Spectra Logic Corporation
MFC after:	1 week
2012-12-07 23:48:54 +00:00

1798 lines
47 KiB
C
Raw Blame History

/*-
* Common functions for CAM "type" (peripheral) drivers.
*
* Copyright (c) 1997, 1998 Justin T. Gibbs.
* Copyright (c) 1997, 1998, 1999, 2000 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/bio.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/devicestat.h>
#include <sys/bus.h>
#include <sys/sbuf.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_queue.h>
#include <cam/cam_xpt_periph.h>
#include <cam/cam_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_pass.h>
static u_int camperiphnextunit(struct periph_driver *p_drv,
u_int newunit, int wired,
path_id_t pathid, target_id_t target,
lun_id_t lun);
static u_int camperiphunit(struct periph_driver *p_drv,
path_id_t pathid, target_id_t target,
lun_id_t lun);
static void camperiphdone(struct cam_periph *periph,
union ccb *done_ccb);
static void camperiphfree(struct cam_periph *periph);
static int camperiphscsistatuserror(union ccb *ccb,
union ccb **orig_ccb,
cam_flags camflags,
u_int32_t sense_flags,
int *openings,
u_int32_t *relsim_flags,
u_int32_t *timeout,
int *print,
const char **action_string);
static int camperiphscsisenseerror(union ccb *ccb,
union ccb **orig_ccb,
cam_flags camflags,
u_int32_t sense_flags,
int *openings,
u_int32_t *relsim_flags,
u_int32_t *timeout,
int *print,
const char **action_string);
static int nperiph_drivers;
static int initialized = 0;
struct periph_driver **periph_drivers;
static MALLOC_DEFINE(M_CAMPERIPH, "CAM periph", "CAM peripheral buffers");
static int periph_selto_delay = 1000;
TUNABLE_INT("kern.cam.periph_selto_delay", &periph_selto_delay);
static int periph_noresrc_delay = 500;
TUNABLE_INT("kern.cam.periph_noresrc_delay", &periph_noresrc_delay);
static int periph_busy_delay = 500;
TUNABLE_INT("kern.cam.periph_busy_delay", &periph_busy_delay);
void
periphdriver_register(void *data)
{
struct periph_driver *drv = (struct periph_driver *)data;
struct periph_driver **newdrivers, **old;
int ndrivers;
ndrivers = nperiph_drivers + 2;
newdrivers = malloc(sizeof(*newdrivers) * ndrivers, M_CAMPERIPH,
M_WAITOK);
if (periph_drivers)
bcopy(periph_drivers, newdrivers,
sizeof(*newdrivers) * nperiph_drivers);
newdrivers[nperiph_drivers] = drv;
newdrivers[nperiph_drivers + 1] = NULL;
old = periph_drivers;
periph_drivers = newdrivers;
if (old)
free(old, M_CAMPERIPH);
nperiph_drivers++;
/* If driver marked as early or it is late now, initialize it. */
if (((drv->flags & CAM_PERIPH_DRV_EARLY) != 0 && initialized > 0) ||
initialized > 1)
(*drv->init)();
}
void
periphdriver_init(int level)
{
int i, early;
initialized = max(initialized, level);
for (i = 0; periph_drivers[i] != NULL; i++) {
early = (periph_drivers[i]->flags & CAM_PERIPH_DRV_EARLY) ? 1 : 2;
if (early == initialized)
(*periph_drivers[i]->init)();
}
}
cam_status
cam_periph_alloc(periph_ctor_t *periph_ctor,
periph_oninv_t *periph_oninvalidate,
periph_dtor_t *periph_dtor, periph_start_t *periph_start,
char *name, cam_periph_type type, struct cam_path *path,
ac_callback_t *ac_callback, ac_code code, void *arg)
{
struct periph_driver **p_drv;
struct cam_sim *sim;
struct cam_periph *periph;
struct cam_periph *cur_periph;
path_id_t path_id;
target_id_t target_id;
lun_id_t lun_id;
cam_status status;
u_int init_level;
init_level = 0;
/*
* Handle Hot-Plug scenarios. If there is already a peripheral
* of our type assigned to this path, we are likely waiting for
* final close on an old, invalidated, peripheral. If this is
* the case, queue up a deferred call to the peripheral's async
* handler. If it looks like a mistaken re-allocation, complain.
*/
if ((periph = cam_periph_find(path, name)) != NULL) {
if ((periph->flags & CAM_PERIPH_INVALID) != 0
&& (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) == 0) {
periph->flags |= CAM_PERIPH_NEW_DEV_FOUND;
periph->deferred_callback = ac_callback;
periph->deferred_ac = code;
return (CAM_REQ_INPROG);
} else {
printf("cam_periph_alloc: attempt to re-allocate "
"valid device %s%d rejected flags %#x "
"refcount %d\n", periph->periph_name,
periph->unit_number, periph->flags,
periph->refcount);
}
return (CAM_REQ_INVALID);
}
periph = (struct cam_periph *)malloc(sizeof(*periph), M_CAMPERIPH,
M_NOWAIT|M_ZERO);
if (periph == NULL)
return (CAM_RESRC_UNAVAIL);
init_level++;
sim = xpt_path_sim(path);
path_id = xpt_path_path_id(path);
target_id = xpt_path_target_id(path);
lun_id = xpt_path_lun_id(path);
cam_init_pinfo(&periph->pinfo);
periph->periph_start = periph_start;
periph->periph_dtor = periph_dtor;
periph->periph_oninval = periph_oninvalidate;
periph->type = type;
periph->periph_name = name;
periph->immediate_priority = CAM_PRIORITY_NONE;
periph->refcount = 0;
periph->sim = sim;
SLIST_INIT(&periph->ccb_list);
status = xpt_create_path(&path, periph, path_id, target_id, lun_id);
if (status != CAM_REQ_CMP)
goto failure;
periph->path = path;
xpt_lock_buses();
for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
if (strcmp((*p_drv)->driver_name, name) == 0)
break;
}
if (*p_drv == NULL) {
printf("cam_periph_alloc: invalid periph name '%s'\n", name);
xpt_free_path(periph->path);
free(periph, M_CAMPERIPH);
xpt_unlock_buses();
return (CAM_REQ_INVALID);
}
periph->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id);
cur_periph = TAILQ_FIRST(&(*p_drv)->units);
while (cur_periph != NULL
&& cur_periph->unit_number < periph->unit_number)
cur_periph = TAILQ_NEXT(cur_periph, unit_links);
if (cur_periph != NULL) {
KASSERT(cur_periph->unit_number != periph->unit_number, ("duplicate units on periph list"));
TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links);
} else {
TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links);
(*p_drv)->generation++;
}
xpt_unlock_buses();
init_level++;
status = xpt_add_periph(periph);
if (status != CAM_REQ_CMP)
goto failure;
init_level++;
CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph created\n"));
status = periph_ctor(periph, arg);
if (status == CAM_REQ_CMP)
init_level++;
failure:
switch (init_level) {
case 4:
/* Initialized successfully */
break;
case 3:
CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
xpt_remove_periph(periph, /*topology_lock_held*/ 0);
/* FALLTHROUGH */
case 2:
xpt_lock_buses();
TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
xpt_unlock_buses();
xpt_free_path(periph->path);
/* FALLTHROUGH */
case 1:
free(periph, M_CAMPERIPH);
/* FALLTHROUGH */
case 0:
/* No cleanup to perform. */
break;
default:
panic("%s: Unknown init level", __func__);
}
return(status);
}
/*
* Find a peripheral structure with the specified path, target, lun,
* and (optionally) type. If the name is NULL, this function will return
* the first peripheral driver that matches the specified path.
*/
struct cam_periph *
cam_periph_find(struct cam_path *path, char *name)
{
struct periph_driver **p_drv;
struct cam_periph *periph;
xpt_lock_buses();
for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0))
continue;
TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
if (xpt_path_comp(periph->path, path) == 0) {
xpt_unlock_buses();
mtx_assert(periph->sim->mtx, MA_OWNED);
return(periph);
}
}
if (name != NULL) {
xpt_unlock_buses();
return(NULL);
}
}
xpt_unlock_buses();
return(NULL);
}
/*
* Find peripheral driver instances attached to the specified path.
*/
int
cam_periph_list(struct cam_path *path, struct sbuf *sb)
{
struct sbuf local_sb;
struct periph_driver **p_drv;
struct cam_periph *periph;
int count;
int sbuf_alloc_len;
sbuf_alloc_len = 16;
retry:
sbuf_new(&local_sb, NULL, sbuf_alloc_len, SBUF_FIXEDLEN);
count = 0;
xpt_lock_buses();
for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
TAILQ_FOREACH(periph, &(*p_drv)->units, unit_links) {
if (xpt_path_comp(periph->path, path) != 0)
continue;
if (sbuf_len(&local_sb) != 0)
sbuf_cat(&local_sb, ",");
sbuf_printf(&local_sb, "%s%d", periph->periph_name,
periph->unit_number);
if (sbuf_error(&local_sb) == ENOMEM) {
sbuf_alloc_len *= 2;
xpt_unlock_buses();
sbuf_delete(&local_sb);
goto retry;
}
count++;
}
}
xpt_unlock_buses();
sbuf_finish(&local_sb);
sbuf_cpy(sb, sbuf_data(&local_sb));
sbuf_delete(&local_sb);
return (count);
}
cam_status
cam_periph_acquire(struct cam_periph *periph)
{
cam_status status;
status = CAM_REQ_CMP_ERR;
if (periph == NULL)
return (status);
xpt_lock_buses();
if ((periph->flags & CAM_PERIPH_INVALID) == 0) {
periph->refcount++;
status = CAM_REQ_CMP;
}
xpt_unlock_buses();
return (status);
}
void
cam_periph_release_locked_buses(struct cam_periph *periph)
{
if (periph->refcount != 0) {
periph->refcount--;
} else {
panic("%s: release of %p when refcount is zero\n ", __func__,
periph);
}
if (periph->refcount == 0
&& (periph->flags & CAM_PERIPH_INVALID)) {
camperiphfree(periph);
}
}
void
cam_periph_release_locked(struct cam_periph *periph)
{
if (periph == NULL)
return;
xpt_lock_buses();
cam_periph_release_locked_buses(periph);
xpt_unlock_buses();
}
void
cam_periph_release(struct cam_periph *periph)
{
struct cam_sim *sim;
if (periph == NULL)
return;
sim = periph->sim;
mtx_assert(sim->mtx, MA_NOTOWNED);
mtx_lock(sim->mtx);
cam_periph_release_locked(periph);
mtx_unlock(sim->mtx);
}
int
cam_periph_hold(struct cam_periph *periph, int priority)
{
int error;
/*
* Increment the reference count on the peripheral
* while we wait for our lock attempt to succeed
* to ensure the peripheral doesn't disappear out
* from user us while we sleep.
*/
if (cam_periph_acquire(periph) != CAM_REQ_CMP)
return (ENXIO);
mtx_assert(periph->sim->mtx, MA_OWNED);
while ((periph->flags & CAM_PERIPH_LOCKED) != 0) {
periph->flags |= CAM_PERIPH_LOCK_WANTED;
if ((error = mtx_sleep(periph, periph->sim->mtx, priority,
"caplck", 0)) != 0) {
cam_periph_release_locked(periph);
return (error);
}
if (periph->flags & CAM_PERIPH_INVALID) {
cam_periph_release_locked(periph);
return (ENXIO);
}
}
periph->flags |= CAM_PERIPH_LOCKED;
return (0);
}
void
cam_periph_unhold(struct cam_periph *periph)
{
mtx_assert(periph->sim->mtx, MA_OWNED);
periph->flags &= ~CAM_PERIPH_LOCKED;
if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) {
periph->flags &= ~CAM_PERIPH_LOCK_WANTED;
wakeup(periph);
}
cam_periph_release_locked(periph);
}
/*
* Look for the next unit number that is not currently in use for this
* peripheral type starting at "newunit". Also exclude unit numbers that
* are reserved by for future "hardwiring" unless we already know that this
* is a potential wired device. Only assume that the device is "wired" the
* first time through the loop since after that we'll be looking at unit
* numbers that did not match a wiring entry.
*/
static u_int
camperiphnextunit(struct periph_driver *p_drv, u_int newunit, int wired,
path_id_t pathid, target_id_t target, lun_id_t lun)
{
struct cam_periph *periph;
char *periph_name;
int i, val, dunit, r;
const char *dname, *strval;
periph_name = p_drv->driver_name;
for (;;newunit++) {
for (periph = TAILQ_FIRST(&p_drv->units);
periph != NULL && periph->unit_number != newunit;
periph = TAILQ_NEXT(periph, unit_links))
;
if (periph != NULL && periph->unit_number == newunit) {
if (wired != 0) {
xpt_print(periph->path, "Duplicate Wired "
"Device entry!\n");
xpt_print(periph->path, "Second device (%s "
"device at scbus%d target %d lun %d) will "
"not be wired\n", periph_name, pathid,
target, lun);
wired = 0;
}
continue;
}
if (wired)
break;
/*
* Don't match entries like "da 4" as a wired down
* device, but do match entries like "da 4 target 5"
* or even "da 4 scbus 1".
*/
i = 0;
dname = periph_name;
for (;;) {
r = resource_find_dev(&i, dname, &dunit, NULL, NULL);
if (r != 0)
break;
/* if no "target" and no specific scbus, skip */
if (resource_int_value(dname, dunit, "target", &val) &&
(resource_string_value(dname, dunit, "at",&strval)||
strcmp(strval, "scbus") == 0))
continue;
if (newunit == dunit)
break;
}
if (r != 0)
break;
}
return (newunit);
}
static u_int
camperiphunit(struct periph_driver *p_drv, path_id_t pathid,
target_id_t target, lun_id_t lun)
{
u_int unit;
int wired, i, val, dunit;
const char *dname, *strval;
char pathbuf[32], *periph_name;
periph_name = p_drv->driver_name;
snprintf(pathbuf, sizeof(pathbuf), "scbus%d", pathid);
unit = 0;
i = 0;
dname = periph_name;
for (wired = 0; resource_find_dev(&i, dname, &dunit, NULL, NULL) == 0;
wired = 0) {
if (resource_string_value(dname, dunit, "at", &strval) == 0) {
if (strcmp(strval, pathbuf) != 0)
continue;
wired++;
}
if (resource_int_value(dname, dunit, "target", &val) == 0) {
if (val != target)
continue;
wired++;
}
if (resource_int_value(dname, dunit, "lun", &val) == 0) {
if (val != lun)
continue;
wired++;
}
if (wired != 0) {
unit = dunit;
break;
}
}
/*
* Either start from 0 looking for the next unit or from
* the unit number given in the resource config. This way,
* if we have wildcard matches, we don't return the same
* unit number twice.
*/
unit = camperiphnextunit(p_drv, unit, wired, pathid, target, lun);
return (unit);
}
void
cam_periph_invalidate(struct cam_periph *periph)
{
CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph invalidated\n"));
/*
* We only call this routine the first time a peripheral is
* invalidated.
*/
if (((periph->flags & CAM_PERIPH_INVALID) == 0)
&& (periph->periph_oninval != NULL))
periph->periph_oninval(periph);
periph->flags |= CAM_PERIPH_INVALID;
periph->flags &= ~CAM_PERIPH_NEW_DEV_FOUND;
xpt_lock_buses();
if (periph->refcount == 0)
camperiphfree(periph);
xpt_unlock_buses();
}
static void
camperiphfree(struct cam_periph *periph)
{
struct periph_driver **p_drv;
for (p_drv = periph_drivers; *p_drv != NULL; p_drv++) {
if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0)
break;
}
if (*p_drv == NULL) {
printf("camperiphfree: attempt to free non-existant periph\n");
return;
}
/*
* We need to set this flag before dropping the topology lock, to
* let anyone who is traversing the list that this peripheral is
* about to be freed, and there will be no more reference count
* checks.
*/
periph->flags |= CAM_PERIPH_FREE;
/*
* The peripheral destructor semantics dictate calling with only the
* SIM mutex held. Since it might sleep, it should not be called
* with the topology lock held.
*/
xpt_unlock_buses();
/*
* We need to call the peripheral destructor prior to removing the
* peripheral from the list. Otherwise, we risk running into a
* scenario where the peripheral unit number may get reused
* (because it has been removed from the list), but some resources
* used by the peripheral are still hanging around. In particular,
* the devfs nodes used by some peripherals like the pass(4) driver
* aren't fully cleaned up until the destructor is run. If the
* unit number is reused before the devfs instance is fully gone,
* devfs will panic.
*/
if (periph->periph_dtor != NULL)
periph->periph_dtor(periph);
/*
* The peripheral list is protected by the topology lock.
*/
xpt_lock_buses();
TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
(*p_drv)->generation++;
xpt_remove_periph(periph, /*topology_lock_held*/ 1);
xpt_unlock_buses();
CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph destroyed\n"));
if (periph->flags & CAM_PERIPH_NEW_DEV_FOUND) {
union ccb ccb;
void *arg;
switch (periph->deferred_ac) {
case AC_FOUND_DEVICE:
ccb.ccb_h.func_code = XPT_GDEV_TYPE;
xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
xpt_action(&ccb);
arg = &ccb;
break;
case AC_PATH_REGISTERED:
ccb.ccb_h.func_code = XPT_PATH_INQ;
xpt_setup_ccb(&ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
xpt_action(&ccb);
arg = &ccb;
break;
default:
arg = NULL;
break;
}
periph->deferred_callback(NULL, periph->deferred_ac,
periph->path, arg);
}
xpt_free_path(periph->path);
free(periph, M_CAMPERIPH);
xpt_lock_buses();
}
/*
* Map user virtual pointers into kernel virtual address space, so we can
* access the memory. This won't work on physical pointers, for now it's
* up to the caller to check for that. (XXX KDM -- should we do that here
* instead?) This also only works for up to MAXPHYS memory. Since we use
* buffers to map stuff in and out, we're limited to the buffer size.
*/
int
cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
{
int numbufs, i, j;
int flags[CAM_PERIPH_MAXMAPS];
u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
u_int32_t lengths[CAM_PERIPH_MAXMAPS];
u_int32_t dirs[CAM_PERIPH_MAXMAPS];
/* Some controllers may not be able to handle more data. */
size_t maxmap = DFLTPHYS;
switch(ccb->ccb_h.func_code) {
case XPT_DEV_MATCH:
if (ccb->cdm.match_buf_len == 0) {
printf("cam_periph_mapmem: invalid match buffer "
"length 0\n");
return(EINVAL);
}
if (ccb->cdm.pattern_buf_len > 0) {
data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
lengths[0] = ccb->cdm.pattern_buf_len;
dirs[0] = CAM_DIR_OUT;
data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
lengths[1] = ccb->cdm.match_buf_len;
dirs[1] = CAM_DIR_IN;
numbufs = 2;
} else {
data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
lengths[0] = ccb->cdm.match_buf_len;
dirs[0] = CAM_DIR_IN;
numbufs = 1;
}
/*
* This request will not go to the hardware, no reason
* to be so strict. vmapbuf() is able to map up to MAXPHYS.
*/
maxmap = MAXPHYS;
break;
case XPT_SCSI_IO:
case XPT_CONT_TARGET_IO:
if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
return(0);
data_ptrs[0] = &ccb->csio.data_ptr;
lengths[0] = ccb->csio.dxfer_len;
dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
numbufs = 1;
break;
case XPT_ATA_IO:
if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_NONE)
return(0);
data_ptrs[0] = &ccb->ataio.data_ptr;
lengths[0] = ccb->ataio.dxfer_len;
dirs[0] = ccb->ccb_h.flags & CAM_DIR_MASK;
numbufs = 1;
break;
case XPT_SMP_IO:
data_ptrs[0] = &ccb->smpio.smp_request;
lengths[0] = ccb->smpio.smp_request_len;
dirs[0] = CAM_DIR_OUT;
data_ptrs[1] = &ccb->smpio.smp_response;
lengths[1] = ccb->smpio.smp_response_len;
dirs[1] = CAM_DIR_IN;
numbufs = 2;
break;
case XPT_DEV_ADVINFO:
if (ccb->cdai.bufsiz == 0)
return (0);
data_ptrs[0] = (uint8_t **)&ccb->cdai.buf;
lengths[0] = ccb->cdai.bufsiz;
dirs[0] = CAM_DIR_IN;
numbufs = 1;
/*
* This request will not go to the hardware, no reason
* to be so strict. vmapbuf() is able to map up to MAXPHYS.
*/
maxmap = MAXPHYS;
break;
default:
return(EINVAL);
break; /* NOTREACHED */
}
/*
* Check the transfer length and permissions first, so we don't
* have to unmap any previously mapped buffers.
*/
for (i = 0; i < numbufs; i++) {
flags[i] = 0;
/*
* The userland data pointer passed in may not be page
* aligned. vmapbuf() truncates the address to a page
* boundary, so if the address isn't page aligned, we'll
* need enough space for the given transfer length, plus
* whatever extra space is necessary to make it to the page
* boundary.
*/
if ((lengths[i] +
(((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)) > maxmap){
printf("cam_periph_mapmem: attempt to map %lu bytes, "
"which is greater than %lu\n",
(long)(lengths[i] +
(((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)),
(u_long)maxmap);
return(E2BIG);
}
if (dirs[i] & CAM_DIR_OUT) {
flags[i] = BIO_WRITE;
}
if (dirs[i] & CAM_DIR_IN) {
flags[i] = BIO_READ;
}
}
/* this keeps the current process from getting swapped */
/*
* XXX KDM should I use P_NOSWAP instead?
*/
PHOLD(curproc);
for (i = 0; i < numbufs; i++) {
/*
* Get the buffer.
*/
mapinfo->bp[i] = getpbuf(NULL);
/* save the buffer's data address */
mapinfo->bp[i]->b_saveaddr = mapinfo->bp[i]->b_data;
/* put our pointer in the data slot */
mapinfo->bp[i]->b_data = *data_ptrs[i];
/* set the transfer length, we know it's < MAXPHYS */
mapinfo->bp[i]->b_bufsize = lengths[i];
/* set the direction */
mapinfo->bp[i]->b_iocmd = flags[i];
/*
* Map the buffer into kernel memory.
*
* Note that useracc() alone is not a sufficient test.
* vmapbuf() can still fail due to a smaller file mapped
* into a larger area of VM, or if userland races against
* vmapbuf() after the useracc() check.
*/
if (vmapbuf(mapinfo->bp[i]) < 0) {
for (j = 0; j < i; ++j) {
*data_ptrs[j] = mapinfo->bp[j]->b_saveaddr;
vunmapbuf(mapinfo->bp[j]);
relpbuf(mapinfo->bp[j], NULL);
}
relpbuf(mapinfo->bp[i], NULL);
PRELE(curproc);
return(EACCES);
}
/* set our pointer to the new mapped area */
*data_ptrs[i] = mapinfo->bp[i]->b_data;
mapinfo->num_bufs_used++;
}
/*
* Now that we've gotten this far, change ownership to the kernel
* of the buffers so that we don't run afoul of returning to user
* space with locks (on the buffer) held.
*/
for (i = 0; i < numbufs; i++) {
BUF_KERNPROC(mapinfo->bp[i]);
}
return(0);
}
/*
* Unmap memory segments mapped into kernel virtual address space by
* cam_periph_mapmem().
*/
void
cam_periph_unmapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo)
{
int numbufs, i;
u_int8_t **data_ptrs[CAM_PERIPH_MAXMAPS];
if (mapinfo->num_bufs_used <= 0) {
/* allow ourselves to be swapped once again */
PRELE(curproc);
return;
}
switch (ccb->ccb_h.func_code) {
case XPT_DEV_MATCH:
numbufs = min(mapinfo->num_bufs_used, 2);
if (numbufs == 1) {
data_ptrs[0] = (u_int8_t **)&ccb->cdm.matches;
} else {
data_ptrs[0] = (u_int8_t **)&ccb->cdm.patterns;
data_ptrs[1] = (u_int8_t **)&ccb->cdm.matches;
}
break;
case XPT_SCSI_IO:
case XPT_CONT_TARGET_IO:
data_ptrs[0] = &ccb->csio.data_ptr;
numbufs = min(mapinfo->num_bufs_used, 1);
break;
case XPT_ATA_IO:
data_ptrs[0] = &ccb->ataio.data_ptr;
numbufs = min(mapinfo->num_bufs_used, 1);
break;
case XPT_SMP_IO:
numbufs = min(mapinfo->num_bufs_used, 2);
data_ptrs[0] = &ccb->smpio.smp_request;
data_ptrs[1] = &ccb->smpio.smp_response;
break;
case XPT_DEV_ADVINFO:
numbufs = min(mapinfo->num_bufs_used, 1);
data_ptrs[0] = (uint8_t **)&ccb->cdai.buf;
break;
default:
/* allow ourselves to be swapped once again */
PRELE(curproc);
return;
break; /* NOTREACHED */
}
for (i = 0; i < numbufs; i++) {
/* Set the user's pointer back to the original value */
*data_ptrs[i] = mapinfo->bp[i]->b_saveaddr;
/* unmap the buffer */
vunmapbuf(mapinfo->bp[i]);
/* release the buffer */
relpbuf(mapinfo->bp[i], NULL);
}
/* allow ourselves to be swapped once again */
PRELE(curproc);
}
union ccb *
cam_periph_getccb(struct cam_periph *periph, u_int32_t priority)
{
struct ccb_hdr *ccb_h;
mtx_assert(periph->sim->mtx, MA_OWNED);
CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdgetccb\n"));
while (SLIST_FIRST(&periph->ccb_list) == NULL) {
if (periph->immediate_priority > priority)
periph->immediate_priority = priority;
xpt_schedule(periph, priority);
if ((SLIST_FIRST(&periph->ccb_list) != NULL)
&& (SLIST_FIRST(&periph->ccb_list)->pinfo.priority == priority))
break;
mtx_assert(periph->sim->mtx, MA_OWNED);
mtx_sleep(&periph->ccb_list, periph->sim->mtx, PRIBIO, "cgticb",
0);
}
ccb_h = SLIST_FIRST(&periph->ccb_list);
SLIST_REMOVE_HEAD(&periph->ccb_list, periph_links.sle);
return ((union ccb *)ccb_h);
}
void
cam_periph_ccbwait(union ccb *ccb)
{
struct cam_sim *sim;
sim = xpt_path_sim(ccb->ccb_h.path);
if ((ccb->ccb_h.pinfo.index != CAM_UNQUEUED_INDEX)
|| ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_INPROG))
mtx_sleep(&ccb->ccb_h.cbfcnp, sim->mtx, PRIBIO, "cbwait", 0);
}
int
cam_periph_ioctl(struct cam_periph *periph, u_long cmd, caddr_t addr,
int (*error_routine)(union ccb *ccb,
cam_flags camflags,
u_int32_t sense_flags))
{
union ccb *ccb;
int error;
int found;
error = found = 0;
switch(cmd){
case CAMGETPASSTHRU:
ccb = cam_periph_getccb(periph, CAM_PRIORITY_NORMAL);
xpt_setup_ccb(&ccb->ccb_h,
ccb->ccb_h.path,
CAM_PRIORITY_NORMAL);
ccb->ccb_h.func_code = XPT_GDEVLIST;
/*
* Basically, the point of this is that we go through
* getting the list of devices, until we find a passthrough
* device. In the current version of the CAM code, the
* only way to determine what type of device we're dealing
* with is by its name.
*/
while (found == 0) {
ccb->cgdl.index = 0;
ccb->cgdl.status = CAM_GDEVLIST_MORE_DEVS;
while (ccb->cgdl.status == CAM_GDEVLIST_MORE_DEVS) {
/* we want the next device in the list */
xpt_action(ccb);
if (strncmp(ccb->cgdl.periph_name,
"pass", 4) == 0){
found = 1;
break;
}
}
if ((ccb->cgdl.status == CAM_GDEVLIST_LAST_DEVICE) &&
(found == 0)) {
ccb->cgdl.periph_name[0] = '\0';
ccb->cgdl.unit_number = 0;
break;
}
}
/* copy the result back out */
bcopy(ccb, addr, sizeof(union ccb));
/* and release the ccb */
xpt_release_ccb(ccb);
break;
default:
error = ENOTTY;
break;
}
return(error);
}
int
cam_periph_runccb(union ccb *ccb,
int (*error_routine)(union ccb *ccb,
cam_flags camflags,
u_int32_t sense_flags),
cam_flags camflags, u_int32_t sense_flags,
struct devstat *ds)
{
struct cam_sim *sim;
int error;
error = 0;
sim = xpt_path_sim(ccb->ccb_h.path);
mtx_assert(sim->mtx, MA_OWNED);
/*
* If the user has supplied a stats structure, and if we understand
* this particular type of ccb, record the transaction start.
*/
if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO ||
ccb->ccb_h.func_code == XPT_ATA_IO))
devstat_start_transaction(ds, NULL);
xpt_action(ccb);
do {
cam_periph_ccbwait(ccb);
if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP)
error = 0;
else if (error_routine != NULL)
error = (*error_routine)(ccb, camflags, sense_flags);
else
error = 0;
} while (error == ERESTART);
if ((ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
cam_release_devq(ccb->ccb_h.path,
/* relsim_flags */0,
/* openings */0,
/* timeout */0,
/* getcount_only */ FALSE);
ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
}
if (ds != NULL) {
if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
devstat_end_transaction(ds,
ccb->csio.dxfer_len,
ccb->csio.tag_action & 0x3,
((ccb->ccb_h.flags & CAM_DIR_MASK) ==
CAM_DIR_NONE) ? DEVSTAT_NO_DATA :
(ccb->ccb_h.flags & CAM_DIR_OUT) ?
DEVSTAT_WRITE :
DEVSTAT_READ, NULL, NULL);
} else if (ccb->ccb_h.func_code == XPT_ATA_IO) {
devstat_end_transaction(ds,
ccb->ataio.dxfer_len,
ccb->ataio.tag_action & 0x3,
((ccb->ccb_h.flags & CAM_DIR_MASK) ==
CAM_DIR_NONE) ? DEVSTAT_NO_DATA :
(ccb->ccb_h.flags & CAM_DIR_OUT) ?
DEVSTAT_WRITE :
DEVSTAT_READ, NULL, NULL);
}
}
return(error);
}
void
cam_freeze_devq(struct cam_path *path)
{
cam_freeze_devq_arg(path, 0, 0);
}
void
cam_freeze_devq_arg(struct cam_path *path, uint32_t flags, uint32_t arg)
{
struct ccb_relsim crs;
xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NONE);
crs.ccb_h.func_code = XPT_FREEZE_QUEUE;
crs.release_flags = flags;
crs.openings = arg;
crs.release_timeout = arg;
xpt_action((union ccb *)&crs);
}
u_int32_t
cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
u_int32_t openings, u_int32_t arg,
int getcount_only)
{
struct ccb_relsim crs;
xpt_setup_ccb(&crs.ccb_h, path, CAM_PRIORITY_NORMAL);
crs.ccb_h.func_code = XPT_REL_SIMQ;
crs.ccb_h.flags = getcount_only ? CAM_DEV_QFREEZE : 0;
crs.release_flags = relsim_flags;
crs.openings = openings;
crs.release_timeout = arg;
xpt_action((union ccb *)&crs);
return (crs.qfrozen_cnt);
}
#define saved_ccb_ptr ppriv_ptr0
static void
camperiphdone(struct cam_periph *periph, union ccb *done_ccb)
{
union ccb *saved_ccb;
cam_status status;
struct scsi_start_stop_unit *scsi_cmd;
int error_code, sense_key, asc, ascq;
scsi_cmd = (struct scsi_start_stop_unit *)
&done_ccb->csio.cdb_io.cdb_bytes;
status = done_ccb->ccb_h.status;
if ((status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
if (scsi_extract_sense_ccb(done_ccb,
&error_code, &sense_key, &asc, &ascq)) {
/*
* If the error is "invalid field in CDB",
* and the load/eject flag is set, turn the
* flag off and try again. This is just in
* case the drive in question barfs on the
* load eject flag. The CAM code should set
* the load/eject flag by default for
* removable media.
*/
if ((scsi_cmd->opcode == START_STOP_UNIT) &&
((scsi_cmd->how & SSS_LOEJ) != 0) &&
(asc == 0x24) && (ascq == 0x00)) {
scsi_cmd->how &= ~SSS_LOEJ;
if (status & CAM_DEV_QFRZN) {
cam_release_devq(done_ccb->ccb_h.path,
0, 0, 0, 0);
done_ccb->ccb_h.status &=
~CAM_DEV_QFRZN;
}
xpt_action(done_ccb);
goto out;
}
}
if (cam_periph_error(done_ccb,
0, SF_RETRY_UA | SF_NO_PRINT, NULL) == ERESTART)
goto out;
if (done_ccb->ccb_h.status & CAM_DEV_QFRZN) {
cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
}
} else {
/*
* If we have successfully taken a device from the not
* ready to ready state, re-scan the device and re-get
* the inquiry information. Many devices (mostly disks)
* don't properly report their inquiry information unless
* they are spun up.
*/
if (scsi_cmd->opcode == START_STOP_UNIT)
xpt_async(AC_INQ_CHANGED, done_ccb->ccb_h.path, NULL);
}
/*
* Perform the final retry with the original CCB so that final
* error processing is performed by the owner of the CCB.
*/
saved_ccb = (union ccb *)done_ccb->ccb_h.saved_ccb_ptr;
bcopy(saved_ccb, done_ccb, sizeof(*done_ccb));
xpt_free_ccb(saved_ccb);
if (done_ccb->ccb_h.cbfcnp != camperiphdone)
periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
xpt_action(done_ccb);
out:
/* Drop freeze taken due to CAM_DEV_QFREEZE flag set. */
cam_release_devq(done_ccb->ccb_h.path, 0, 0, 0, 0);
}
/*
* Generic Async Event handler. Peripheral drivers usually
* filter out the events that require personal attention,
* and leave the rest to this function.
*/
void
cam_periph_async(struct cam_periph *periph, u_int32_t code,
struct cam_path *path, void *arg)
{
switch (code) {
case AC_LOST_DEVICE:
cam_periph_invalidate(periph);
break;
default:
break;
}
}
void
cam_periph_bus_settle(struct cam_periph *periph, u_int bus_settle)
{
struct ccb_getdevstats cgds;
xpt_setup_ccb(&cgds.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
cgds.ccb_h.func_code = XPT_GDEV_STATS;
xpt_action((union ccb *)&cgds);
cam_periph_freeze_after_event(periph, &cgds.last_reset, bus_settle);
}
void
cam_periph_freeze_after_event(struct cam_periph *periph,
struct timeval* event_time, u_int duration_ms)
{
struct timeval delta;
struct timeval duration_tv;
if (!timevalisset(event_time))
return;
microtime(&delta);
timevalsub(&delta, event_time);
duration_tv.tv_sec = duration_ms / 1000;
duration_tv.tv_usec = (duration_ms % 1000) * 1000;
if (timevalcmp(&delta, &duration_tv, <)) {
timevalsub(&duration_tv, &delta);
duration_ms = duration_tv.tv_sec * 1000;
duration_ms += duration_tv.tv_usec / 1000;
cam_freeze_devq(periph->path);
cam_release_devq(periph->path,
RELSIM_RELEASE_AFTER_TIMEOUT,
/*reduction*/0,
/*timeout*/duration_ms,
/*getcount_only*/0);
}
}
static int
camperiphscsistatuserror(union ccb *ccb, union ccb **orig_ccb,
cam_flags camflags, u_int32_t sense_flags,
int *openings, u_int32_t *relsim_flags,
u_int32_t *timeout, int *print, const char **action_string)
{
int error;
switch (ccb->csio.scsi_status) {
case SCSI_STATUS_OK:
case SCSI_STATUS_COND_MET:
case SCSI_STATUS_INTERMED:
case SCSI_STATUS_INTERMED_COND_MET:
error = 0;
break;
case SCSI_STATUS_CMD_TERMINATED:
case SCSI_STATUS_CHECK_COND:
error = camperiphscsisenseerror(ccb, orig_ccb,
camflags,
sense_flags,
openings,
relsim_flags,
timeout,
print,
action_string);
break;
case SCSI_STATUS_QUEUE_FULL:
{
/* no decrement */
struct ccb_getdevstats cgds;
/*
* First off, find out what the current
* transaction counts are.
*/
xpt_setup_ccb(&cgds.ccb_h,
ccb->ccb_h.path,
CAM_PRIORITY_NORMAL);
cgds.ccb_h.func_code = XPT_GDEV_STATS;
xpt_action((union ccb *)&cgds);
/*
* If we were the only transaction active, treat
* the QUEUE FULL as if it were a BUSY condition.
*/
if (cgds.dev_active != 0) {
int total_openings;
/*
* Reduce the number of openings to
* be 1 less than the amount it took
* to get a queue full bounded by the
* minimum allowed tag count for this
* device.
*/
total_openings = cgds.dev_active + cgds.dev_openings;
*openings = cgds.dev_active;
if (*openings < cgds.mintags)
*openings = cgds.mintags;
if (*openings < total_openings)
*relsim_flags = RELSIM_ADJUST_OPENINGS;
else {
/*
* Some devices report queue full for
* temporary resource shortages. For
* this reason, we allow a minimum
* tag count to be entered via a
* quirk entry to prevent the queue
* count on these devices from falling
* to a pessimisticly low value. We
* still wait for the next successful
* completion, however, before queueing
* more transactions to the device.
*/
*relsim_flags = RELSIM_RELEASE_AFTER_CMDCMPLT;
}
*timeout = 0;
error = ERESTART;
*print = 0;
break;
}
/* FALLTHROUGH */
}
case SCSI_STATUS_BUSY:
/*
* Restart the queue after either another
* command completes or a 1 second timeout.
*/
if (ccb->ccb_h.retry_count > 0) {
ccb->ccb_h.retry_count--;
error = ERESTART;
*relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT
| RELSIM_RELEASE_AFTER_CMDCMPLT;
*timeout = 1000;
} else {
error = EIO;
}
break;
case SCSI_STATUS_RESERV_CONFLICT:
default:
error = EIO;
break;
}
return (error);
}
static int
camperiphscsisenseerror(union ccb *ccb, union ccb **orig,
cam_flags camflags, u_int32_t sense_flags,
int *openings, u_int32_t *relsim_flags,
u_int32_t *timeout, int *print, const char **action_string)
{
struct cam_periph *periph;
union ccb *orig_ccb = ccb;
int error, recoveryccb;
periph = xpt_path_periph(ccb->ccb_h.path);
recoveryccb = (ccb->ccb_h.cbfcnp == camperiphdone);
if ((periph->flags & CAM_PERIPH_RECOVERY_INPROG) && !recoveryccb) {
/*
* If error recovery is already in progress, don't attempt
* to process this error, but requeue it unconditionally
* and attempt to process it once error recovery has
* completed. This failed command is probably related to
* the error that caused the currently active error recovery
* action so our current recovery efforts should also
* address this command. Be aware that the error recovery
* code assumes that only one recovery action is in progress
* on a particular peripheral instance at any given time
* (e.g. only one saved CCB for error recovery) so it is
* imperitive that we don't violate this assumption.
*/
error = ERESTART;
*print = 0;
} else {
scsi_sense_action err_action;
struct ccb_getdev cgd;
/*
* Grab the inquiry data for this device.
*/
xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path, CAM_PRIORITY_NORMAL);
cgd.ccb_h.func_code = XPT_GDEV_TYPE;
xpt_action((union ccb *)&cgd);
err_action = scsi_error_action(&ccb->csio, &cgd.inq_data,
sense_flags);
error = err_action & SS_ERRMASK;
/*
* Do not autostart sequential access devices
* to avoid unexpected tape loading.
*/
if ((err_action & SS_MASK) == SS_START &&
SID_TYPE(&cgd.inq_data) == T_SEQUENTIAL) {
*action_string = "Will not autostart a "
"sequential access device";
goto sense_error_done;
}
/*
* Avoid recovery recursion if recovery action is the same.
*/
if ((err_action & SS_MASK) >= SS_START && recoveryccb) {
if (((err_action & SS_MASK) == SS_START &&
ccb->csio.cdb_io.cdb_bytes[0] == START_STOP_UNIT) ||
((err_action & SS_MASK) == SS_TUR &&
(ccb->csio.cdb_io.cdb_bytes[0] == TEST_UNIT_READY))) {
err_action = SS_RETRY|SSQ_DECREMENT_COUNT|EIO;
*relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
*timeout = 500;
}
}
/*
* If the recovery action will consume a retry,
* make sure we actually have retries available.
*/
if ((err_action & SSQ_DECREMENT_COUNT) != 0) {
if (ccb->ccb_h.retry_count > 0 &&
(periph->flags & CAM_PERIPH_INVALID) == 0)
ccb->ccb_h.retry_count--;
else {
*action_string = "Retries exhausted";
goto sense_error_done;
}
}
if ((err_action & SS_MASK) >= SS_START) {
/*
* Do common portions of commands that
* use recovery CCBs.
*/
orig_ccb = xpt_alloc_ccb_nowait();
if (orig_ccb == NULL) {
*action_string = "Can't allocate recovery CCB";
goto sense_error_done;
}
/*
* Clear freeze flag for original request here, as
* this freeze will be dropped as part of ERESTART.
*/
ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
bcopy(ccb, orig_ccb, sizeof(*orig_ccb));
}
switch (err_action & SS_MASK) {
case SS_NOP:
*action_string = "No recovery action needed";
error = 0;
break;
case SS_RETRY:
*action_string = "Retrying command (per sense data)";
error = ERESTART;
break;
case SS_FAIL:
*action_string = "Unretryable error";
break;
case SS_START:
{
int le;
/*
* Send a start unit command to the device, and
* then retry the command.
*/
*action_string = "Attempting to start unit";
periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
/*
* Check for removable media and set
* load/eject flag appropriately.
*/
if (SID_IS_REMOVABLE(&cgd.inq_data))
le = TRUE;
else
le = FALSE;
scsi_start_stop(&ccb->csio,
/*retries*/1,
camperiphdone,
MSG_SIMPLE_Q_TAG,
/*start*/TRUE,
/*load/eject*/le,
/*immediate*/FALSE,
SSD_FULL_SIZE,
/*timeout*/50000);
break;
}
case SS_TUR:
{
/*
* Send a Test Unit Ready to the device.
* If the 'many' flag is set, we send 120
* test unit ready commands, one every half
* second. Otherwise, we just send one TUR.
* We only want to do this if the retry
* count has not been exhausted.
*/
int retries;
if ((err_action & SSQ_MANY) != 0) {
*action_string = "Polling device for readiness";
retries = 120;
} else {
*action_string = "Testing device for readiness";
retries = 1;
}
periph->flags |= CAM_PERIPH_RECOVERY_INPROG;
scsi_test_unit_ready(&ccb->csio,
retries,
camperiphdone,
MSG_SIMPLE_Q_TAG,
SSD_FULL_SIZE,
/*timeout*/5000);
/*
* Accomplish our 500ms delay by deferring
* the release of our device queue appropriately.
*/
*relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
*timeout = 500;
break;
}
default:
panic("Unhandled error action %x", err_action);
}
if ((err_action & SS_MASK) >= SS_START) {
/*
* Drop the priority, so that the recovery
* CCB is the first to execute. Freeze the queue
* after this command is sent so that we can
* restore the old csio and have it queued in
* the proper order before we release normal
* transactions to the device.
*/
ccb->ccb_h.pinfo.priority--;
ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
ccb->ccb_h.saved_ccb_ptr = orig_ccb;
error = ERESTART;
*orig = orig_ccb;
}
sense_error_done:
*print = ((err_action & SSQ_PRINT_SENSE) != 0);
}
return (error);
}
/*
* Generic error handler. Peripheral drivers usually filter
* out the errors that they handle in a unique mannor, then
* call this function.
*/
int
cam_periph_error(union ccb *ccb, cam_flags camflags,
u_int32_t sense_flags, union ccb *save_ccb)
{
union ccb *orig_ccb;
struct cam_periph *periph;
const char *action_string;
cam_status status;
int frozen, error, openings, print, lost_device;
int error_code, sense_key, asc, ascq;
u_int32_t relsim_flags, timeout;
print = 1;
periph = xpt_path_periph(ccb->ccb_h.path);
action_string = NULL;
status = ccb->ccb_h.status;
frozen = (status & CAM_DEV_QFRZN) != 0;
status &= CAM_STATUS_MASK;
openings = relsim_flags = timeout = lost_device = 0;
orig_ccb = ccb;
switch (status) {
case CAM_REQ_CMP:
error = 0;
print = 0;
break;
case CAM_SCSI_STATUS_ERROR:
error = camperiphscsistatuserror(ccb, &orig_ccb,
camflags, sense_flags, &openings, &relsim_flags,
&timeout, &print, &action_string);
break;
case CAM_AUTOSENSE_FAIL:
error = EIO; /* we have to kill the command */
break;
case CAM_UA_ABORT:
case CAM_UA_TERMIO:
case CAM_MSG_REJECT_REC:
/* XXX Don't know that these are correct */
error = EIO;
break;
case CAM_SEL_TIMEOUT:
if ((camflags & CAM_RETRY_SELTO) != 0) {
if (ccb->ccb_h.retry_count > 0 &&
(periph->flags & CAM_PERIPH_INVALID) == 0) {
ccb->ccb_h.retry_count--;
error = ERESTART;
/*
* Wait a bit to give the device
* time to recover before we try again.
*/
relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
timeout = periph_selto_delay;
break;
}
action_string = "Retries exhausted";
}
/* FALLTHROUGH */
case CAM_DEV_NOT_THERE:
error = ENXIO;
print = 0;
lost_device = 1;
break;
case CAM_REQ_INVALID:
case CAM_PATH_INVALID:
case CAM_NO_HBA:
case CAM_PROVIDE_FAIL:
case CAM_REQ_TOO_BIG:
case CAM_LUN_INVALID:
case CAM_TID_INVALID:
error = EINVAL;
break;
case CAM_SCSI_BUS_RESET:
case CAM_BDR_SENT:
/*
* Commands that repeatedly timeout and cause these
* kinds of error recovery actions, should return
* CAM_CMD_TIMEOUT, which allows us to safely assume
* that this command was an innocent bystander to
* these events and should be unconditionally
* retried.
*/
case CAM_REQUEUE_REQ:
/* Unconditional requeue if device is still there */
if (periph->flags & CAM_PERIPH_INVALID) {
action_string = "Periph was invalidated";
error = EIO;
} else if (sense_flags & SF_NO_RETRY) {
error = EIO;
action_string = "Retry was blocked";
} else {
error = ERESTART;
print = 0;
}
break;
case CAM_RESRC_UNAVAIL:
/* Wait a bit for the resource shortage to abate. */
timeout = periph_noresrc_delay;
/* FALLTHROUGH */
case CAM_BUSY:
if (timeout == 0) {
/* Wait a bit for the busy condition to abate. */
timeout = periph_busy_delay;
}
relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
/* FALLTHROUGH */
case CAM_ATA_STATUS_ERROR:
case CAM_REQ_CMP_ERR:
case CAM_CMD_TIMEOUT:
case CAM_UNEXP_BUSFREE:
case CAM_UNCOR_PARITY:
case CAM_DATA_RUN_ERR:
default:
if (periph->flags & CAM_PERIPH_INVALID) {
error = EIO;
action_string = "Periph was invalidated";
} else if (ccb->ccb_h.retry_count == 0) {
error = EIO;
action_string = "Retries exhausted";
} else if (sense_flags & SF_NO_RETRY) {
error = EIO;
action_string = "Retry was blocked";
} else {
ccb->ccb_h.retry_count--;
error = ERESTART;
}
break;
}
if ((sense_flags & SF_PRINT_ALWAYS) ||
CAM_DEBUGGED(ccb->ccb_h.path, CAM_DEBUG_INFO))
print = 1;
else if (sense_flags & SF_NO_PRINT)
print = 0;
if (print)
cam_error_print(orig_ccb, CAM_ESF_ALL, CAM_EPF_ALL);
if (error != 0 && print) {
if (error != ERESTART) {
if (action_string == NULL)
action_string = "Unretryable error";
xpt_print(ccb->ccb_h.path, "Error %d, %s\n",
error, action_string);
} else if (action_string != NULL)
xpt_print(ccb->ccb_h.path, "%s\n", action_string);
else
xpt_print(ccb->ccb_h.path, "Retrying command\n");
}
if (lost_device) {
struct cam_path *newpath;
lun_id_t lun_id;
/*
* For a selection timeout, we consider all of the LUNs on
* the target to be gone. If the status is CAM_DEV_NOT_THERE,
* then we only get rid of the device(s) specified by the
* path in the original CCB.
*/
if (status == CAM_DEV_NOT_THERE)
lun_id = xpt_path_lun_id(ccb->ccb_h.path);
else
lun_id = CAM_LUN_WILDCARD;
/* Should we do more if we can't create the path?? */
if (xpt_create_path(&newpath, periph,
xpt_path_path_id(ccb->ccb_h.path),
xpt_path_target_id(ccb->ccb_h.path),
lun_id) == CAM_REQ_CMP) {
/*
* Let peripheral drivers know that this
* device has gone away.
*/
xpt_async(AC_LOST_DEVICE, newpath, NULL);
xpt_free_path(newpath);
}
/* Broadcast UNIT ATTENTIONs to all periphs. */
} else if (scsi_extract_sense_ccb(ccb,
&error_code, &sense_key, &asc, &ascq) &&
sense_key == SSD_KEY_UNIT_ATTENTION) {
xpt_async(AC_UNIT_ATTENTION, orig_ccb->ccb_h.path, orig_ccb);
}
/* Attempt a retry */
if (error == ERESTART || error == 0) {
if (frozen != 0)
ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
if (error == ERESTART)
xpt_action(ccb);
if (frozen != 0)
cam_release_devq(ccb->ccb_h.path,
relsim_flags,
openings,
timeout,
/*getcount_only*/0);
}
return (error);
}
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