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freebsd/sys/cam/cam_periph.c
Poul-Henning Kamp 9626b608de Separate the struct bio related stuff out of <sys/buf.h> into 
<sys/bio.h>.

<sys/bio.h> is now a prerequisite for <sys/buf.h> but it shall
not be made a nested include according to bdes teachings on the
subject of nested includes.

Diskdrivers and similar stuff below specfs::strategy() should no
longer need to include <sys/buf.> unless they need caching of data.

Still a few bogus uses of struct buf to track down.

Repocopy by:    peter
2000-05-05 09:59:14 +00:00

1658 lines
40 KiB
C
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/*
* Common functions for CAM "type" (peripheral) drivers.
*
* Copyright (c) 1997, 1998 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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/malloc.h>
#include <sys/linker_set.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/devicestat.h>
#include <sys/bus.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_xpt_periph.h>
#include <cam/cam_periph.h>
#include <cam/cam_debug.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_message.h>
#include <cam/scsi/scsi_da.h>
#include <cam/scsi/scsi_pass.h>
static u_int camperiphnextunit(struct periph_driver *p_drv,
u_int newunit, int wired);
static u_int camperiphunit(struct periph_driver *p_drv,
path_id_t path_id_t,
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);
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_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;
int s;
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-alloation, 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\n",
periph->periph_name, periph->unit_number);
}
return (CAM_REQ_INVALID);
}
periph = (struct cam_periph *)malloc(sizeof(*periph), M_DEVBUF,
M_NOWAIT);
if (periph == NULL)
return (CAM_RESRC_UNAVAIL);
init_level++;
for (p_drv = (struct periph_driver **)periphdriver_set.ls_items;
*p_drv != NULL; p_drv++) {
if (strcmp((*p_drv)->driver_name, name) == 0)
break;
}
path_id = xpt_path_path_id(path);
target_id = xpt_path_target_id(path);
lun_id = xpt_path_lun_id(path);
bzero(periph, sizeof(*periph));
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->unit_number = camperiphunit(*p_drv, path_id, target_id, lun_id);
periph->immediate_priority = CAM_PRIORITY_NONE;
periph->refcount = 0;
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;
init_level++;
status = xpt_add_periph(periph);
if (status != CAM_REQ_CMP)
goto failure;
s = splsoftcam();
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)
TAILQ_INSERT_BEFORE(cur_periph, periph, unit_links);
else {
TAILQ_INSERT_TAIL(&(*p_drv)->units, periph, unit_links);
(*p_drv)->generation++;
}
splx(s);
init_level++;
status = periph_ctor(periph, arg);
if (status == CAM_REQ_CMP)
init_level++;
failure:
switch (init_level) {
case 4:
/* Initialized successfully */
break;
case 3:
s = splsoftcam();
TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
splx(s);
xpt_remove_periph(periph);
case 2:
xpt_free_path(periph->path);
case 1:
free(periph, M_DEVBUF);
case 0:
/* No cleanup to perform. */
break;
default:
panic("cam_periph_alloc: Unkown init level");
}
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;
int s;
for (p_drv = (struct periph_driver **)periphdriver_set.ls_items;
*p_drv != NULL; p_drv++) {
if (name != NULL && (strcmp((*p_drv)->driver_name, name) != 0))
continue;
s = splsoftcam();
for (periph = TAILQ_FIRST(&(*p_drv)->units); periph != NULL;
periph = TAILQ_NEXT(periph, unit_links)) {
if (xpt_path_comp(periph->path, path) == 0) {
splx(s);
return(periph);
}
}
splx(s);
if (name != NULL)
return(NULL);
}
return(NULL);
}
cam_status
cam_periph_acquire(struct cam_periph *periph)
{
int s;
if (periph == NULL)
return(CAM_REQ_CMP_ERR);
s = splsoftcam();
periph->refcount++;
splx(s);
return(CAM_REQ_CMP);
}
void
cam_periph_release(struct cam_periph *periph)
{
int s;
if (periph == NULL)
return;
s = splsoftcam();
if ((--periph->refcount == 0)
&& (periph->flags & CAM_PERIPH_INVALID)) {
camperiphfree(periph);
}
splx(s);
}
/*
* 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)
{
struct cam_periph *periph;
char *periph_name, *strval;
int s;
int i, val, dunit;
const char *dname;
s = splsoftcam();
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_path(periph->path);
printf("Duplicate Wired Device entry!\n");
xpt_print_path(periph->path);
printf("Second device will not be wired\n");
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 = -1;
while ((i = resource_locate(i, periph_name)) != -1) {
dname = resource_query_name(i);
dunit = resource_query_unit(i);
/* 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 (i == -1)
break;
}
splx(s);
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 hit, i, val, dunit;
const char *dname;
char pathbuf[32], *strval, *periph_name;
unit = 0;
hit = 0;
periph_name = p_drv->driver_name;
snprintf(pathbuf, sizeof(pathbuf), "scbus%d", pathid);
i = -1;
while ((i = resource_locate(i, periph_name)) != -1) {
dname = resource_query_name(i);
dunit = resource_query_unit(i);
if (resource_string_value(dname, dunit, "at", &strval) == 0) {
if (strcmp(strval, pathbuf) != 0)
continue;
hit++;
}
if (resource_int_value(dname, dunit, "target", &val) == 0) {
if (val != target)
continue;
hit++;
}
if (resource_int_value(dname, dunit, "lun", &val) == 0) {
if (val != lun)
continue;
hit++;
}
if (hit != 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*/hit);
return (unit);
}
void
cam_periph_invalidate(struct cam_periph *periph)
{
int s;
s = splsoftcam();
/*
* We only call this routine the first time a peripheral is
* invalidated. The oninvalidate() routine is always called at
* splsoftcam().
*/
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;
if (periph->refcount == 0)
camperiphfree(periph);
else if (periph->refcount < 0)
printf("cam_invalidate_periph: refcount < 0!!\n");
splx(s);
}
static void
camperiphfree(struct cam_periph *periph)
{
int s;
struct periph_driver **p_drv;
for (p_drv = (struct periph_driver **)periphdriver_set.ls_items;
*p_drv != NULL; p_drv++) {
if (strcmp((*p_drv)->driver_name, periph->periph_name) == 0)
break;
}
if (periph->periph_dtor != NULL)
periph->periph_dtor(periph);
s = splsoftcam();
TAILQ_REMOVE(&(*p_drv)->units, periph, unit_links);
(*p_drv)->generation++;
splx(s);
xpt_remove_periph(periph);
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, /*priority*/ 1);
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, /*priority*/ 1);
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_DEVBUF);
}
/*
* Wait interruptibly for an exclusive lock.
*/
int
cam_periph_lock(struct cam_periph *periph, int priority)
{
int error;
while ((periph->flags & CAM_PERIPH_LOCKED) != 0) {
periph->flags |= CAM_PERIPH_LOCK_WANTED;
if ((error = tsleep(periph, priority, "caplck", 0)) != 0)
return error;
}
if (cam_periph_acquire(periph) != CAM_REQ_CMP)
return(ENXIO);
periph->flags |= CAM_PERIPH_LOCKED;
return 0;
}
/*
* Unlock and wake up any waiters.
*/
void
cam_periph_unlock(struct cam_periph *periph)
{
periph->flags &= ~CAM_PERIPH_LOCKED;
if ((periph->flags & CAM_PERIPH_LOCK_WANTED) != 0) {
periph->flags &= ~CAM_PERIPH_LOCK_WANTED;
wakeup(periph);
}
cam_periph_release(periph);
}
/*
* 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;
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];
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;
}
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;
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)) > DFLTPHYS){
printf("cam_periph_mapmem: attempt to map %lu bytes, "
"which is greater than DFLTPHYS(%d)\n",
(long)(lengths[i] +
(((vm_offset_t)(*data_ptrs[i])) & PAGE_MASK)),
DFLTPHYS);
return(E2BIG);
}
if (dirs[i] & CAM_DIR_OUT) {
flags[i] = BIO_WRITE;
if (!useracc(*data_ptrs[i], lengths[i],
VM_PROT_READ)) {
printf("cam_periph_mapmem: error, "
"address %p, length %lu isn't "
"user accessible for READ\n",
(void *)*data_ptrs[i],
(u_long)lengths[i]);
return(EACCES);
}
}
if (dirs[i] & CAM_DIR_IN) {
flags[i] = BIO_READ;
if (!useracc(*data_ptrs[i], lengths[i],
VM_PROT_WRITE)) {
printf("cam_periph_mapmem: error, "
"address %p, length %lu isn't "
"user accessible for WRITE\n",
(void *)*data_ptrs[i],
(u_long)lengths[i]);
return(EACCES);
}
}
}
/* 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 < DFLTPHYS */
mapinfo->bp[i]->b_bufsize = lengths[i];
/* set the flags */
mapinfo->bp[i]->b_flags = B_PHYS;
/* set the direction */
mapinfo->bp[i]->b_iocmd = flags[i];
/* map the buffer into kernel memory */
vmapbuf(mapinfo->bp[i]);
/* set our pointer to the new mapped area */
*data_ptrs[i] = mapinfo->bp[i]->b_data;
mapinfo->num_bufs_used++;
}
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;
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]);
/* clear the flags we set above */
mapinfo->bp[i]->b_flags &= ~B_PHYS;
/* 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;
int s;
CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering cdgetccb\n"));
s = splsoftcam();
while (periph->ccb_list.slh_first == NULL) {
if (periph->immediate_priority > priority)
periph->immediate_priority = priority;
xpt_schedule(periph, priority);
if ((periph->ccb_list.slh_first != NULL)
&& (periph->ccb_list.slh_first->pinfo.priority == priority))
break;
tsleep(&periph->ccb_list, PRIBIO, "cgticb", 0);
}
ccb_h = periph->ccb_list.slh_first;
SLIST_REMOVE_HEAD(&periph->ccb_list, periph_links.sle);
splx(s);
return ((union ccb *)ccb_h);
}
void
cam_periph_ccbwait(union ccb *ccb)
{
int s;
s = splsoftcam();
if ((ccb->ccb_h.pinfo.index != CAM_UNQUEUED_INDEX)
|| ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_INPROG))
tsleep(&ccb->ccb_h.cbfcnp, PRIBIO, "cbwait", 0);
splx(s);
}
int
cam_periph_ioctl(struct cam_periph *periph, int 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, /* priority */ 1);
xpt_setup_ccb(&ccb->ccb_h,
ccb->ccb_h.path,
/*priority*/1);
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)
{
int error;
error = 0;
/*
* 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))
devstat_start_transaction(ds);
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);
if ((ds != NULL) && (ccb->ccb_h.func_code == XPT_SCSI_IO))
devstat_end_transaction(ds,
ccb->csio.dxfer_len,
ccb->csio.tag_action & 0xf,
((ccb->ccb_h.flags & CAM_DIR_MASK) ==
CAM_DIR_NONE) ? DEVSTAT_NO_DATA :
(ccb->ccb_h.flags & CAM_DIR_OUT) ?
DEVSTAT_WRITE :
DEVSTAT_READ);
return(error);
}
void
cam_freeze_devq(struct cam_path *path)
{
struct ccb_hdr ccb_h;
xpt_setup_ccb(&ccb_h, path, /*priority*/1);
ccb_h.func_code = XPT_NOOP;
ccb_h.flags = CAM_DEV_QFREEZE;
xpt_action((union ccb *)&ccb_h);
}
u_int32_t
cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
u_int32_t openings, u_int32_t timeout,
int getcount_only)
{
struct ccb_relsim crs;
xpt_setup_ccb(&crs.ccb_h, path,
/*priority*/1);
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 = timeout;
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)
{
cam_status status;
int frozen;
int sense;
struct scsi_start_stop_unit *scsi_cmd;
u_int32_t relsim_flags, timeout;
u_int32_t qfrozen_cnt;
status = done_ccb->ccb_h.status;
frozen = (status & CAM_DEV_QFRZN) != 0;
sense = (status & CAM_AUTOSNS_VALID) != 0;
status &= CAM_STATUS_MASK;
timeout = 0;
relsim_flags = 0;
/*
* Unfreeze the queue once if it is already frozen..
*/
if (frozen != 0) {
qfrozen_cnt = cam_release_devq(done_ccb->ccb_h.path,
/*relsim_flags*/0,
/*openings*/0,
/*timeout*/0,
/*getcount_only*/0);
}
switch (status) {
case CAM_REQ_CMP:
/*
* 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 (done_ccb->ccb_h.func_code == XPT_SCSI_IO) {
scsi_cmd = (struct scsi_start_stop_unit *)
&done_ccb->csio.cdb_io.cdb_bytes;
if (scsi_cmd->opcode == START_STOP_UNIT)
xpt_async(AC_INQ_CHANGED,
done_ccb->ccb_h.path, NULL);
}
bcopy(done_ccb->ccb_h.saved_ccb_ptr, done_ccb,
sizeof(union ccb));
periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
xpt_action(done_ccb);
break;
case CAM_SCSI_STATUS_ERROR:
scsi_cmd = (struct scsi_start_stop_unit *)
&done_ccb->csio.cdb_io.cdb_bytes;
if (sense != 0) {
struct scsi_sense_data *sense;
int error_code, sense_key, asc, ascq;
sense = &done_ccb->csio.sense_data;
scsi_extract_sense(sense, &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.
*/
/* XXX KDM
* Should we check to see what the specific
* scsi status is?? Or does it not matter
* since we already know that there was an
* error, and we know what the specific
* error code was, and we know what the
* opcode is..
*/
if ((scsi_cmd->opcode == START_STOP_UNIT) &&
((scsi_cmd->how & SSS_LOEJ) != 0) &&
(asc == 0x24) && (ascq == 0x00) &&
(done_ccb->ccb_h.retry_count > 0)) {
scsi_cmd->how &= ~SSS_LOEJ;
xpt_action(done_ccb);
} else if (done_ccb->ccb_h.retry_count > 0) {
/*
* In this case, the error recovery
* command failed, but we've got
* some retries left on it. Give
* it another try.
*/
/* set the timeout to .5 sec */
relsim_flags =
RELSIM_RELEASE_AFTER_TIMEOUT;
timeout = 500;
xpt_action(done_ccb);
break;
} else {
/*
* Copy the original CCB back and
* send it back to the caller.
*/
bcopy(done_ccb->ccb_h.saved_ccb_ptr,
done_ccb, sizeof(union ccb));
periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
xpt_action(done_ccb);
}
} else {
/*
* Eh?? The command failed, but we don't
* have any sense. What's up with that?
* Fire the CCB again to return it to the
* caller.
*/
bcopy(done_ccb->ccb_h.saved_ccb_ptr,
done_ccb, sizeof(union ccb));
periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
xpt_action(done_ccb);
}
break;
default:
bcopy(done_ccb->ccb_h.saved_ccb_ptr, done_ccb,
sizeof(union ccb));
periph->flags &= ~CAM_PERIPH_RECOVERY_INPROG;
xpt_action(done_ccb);
break;
}
/* decrement the retry count */
if (done_ccb->ccb_h.retry_count > 0)
done_ccb->ccb_h.retry_count--;
qfrozen_cnt = cam_release_devq(done_ccb->ccb_h.path,
/*relsim_flags*/relsim_flags,
/*openings*/0,
/*timeout*/timeout,
/*getcount_only*/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;
case AC_SENT_BDR:
case AC_BUS_RESET:
{
cam_periph_bus_settle(periph, SCSI_DELAY);
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, /*priority*/1);
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;
int s;
s = splclock();
microtime(&delta);
splx(s);
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);
}
}
/*
* 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)
{
cam_status status;
int frozen;
int sense;
int error;
int openings;
int retry;
u_int32_t relsim_flags;
u_int32_t timeout;
status = ccb->ccb_h.status;
frozen = (status & CAM_DEV_QFRZN) != 0;
sense = (status & CAM_AUTOSNS_VALID) != 0;
status &= CAM_STATUS_MASK;
relsim_flags = 0;
switch (status) {
case CAM_REQ_CMP:
/* decrement the number of retries */
retry = ccb->ccb_h.retry_count > 0;
if (retry)
ccb->ccb_h.retry_count--;
error = 0;
break;
case CAM_AUTOSENSE_FAIL:
case CAM_SCSI_STATUS_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:
if (sense != 0) {
struct scsi_sense_data *sense;
int error_code, sense_key, asc, ascq;
struct cam_periph *periph;
scsi_sense_action err_action;
struct ccb_getdev cgd;
sense = &ccb->csio.sense_data;
scsi_extract_sense(sense, &error_code,
&sense_key, &asc, &ascq);
periph = xpt_path_periph(ccb->ccb_h.path);
/*
* Grab the inquiry data for this device.
*/
xpt_setup_ccb(&cgd.ccb_h, ccb->ccb_h.path,
/*priority*/ 1);
cgd.ccb_h.func_code = XPT_GDEV_TYPE;
xpt_action((union ccb *)&cgd);
err_action = scsi_error_action(asc, ascq,
&cgd.inq_data);
/*
* 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.
*/
if (((err_action & SS_MASK) == SS_TUR)
&& save_ccb != NULL
&& ccb->ccb_h.retry_count > 0) {
/*
* Since error recovery is already
* in progress, don't attempt to
* process this error. It is probably
* related to the error that caused
* the currently active error recovery
* action. Also, we only have
* space for one saved CCB, so if we
* had two concurrent error recovery
* actions, we would end up
* over-writing one error recovery
* CCB with another one.
*/
if (periph->flags &
CAM_PERIPH_RECOVERY_INPROG) {
error = ERESTART;
break;
}
periph->flags |=
CAM_PERIPH_RECOVERY_INPROG;
/* decrement the number of retries */
if ((err_action &
SSQ_DECREMENT_COUNT) != 0) {
retry = 1;
ccb->ccb_h.retry_count--;
}
bcopy(ccb, save_ccb, sizeof(*save_ccb));
/*
* We retry this one every half
* second for a minute. If the
* device hasn't become ready in a
* minute's time, it's unlikely to
* ever become ready. If the table
* doesn't specify SSQ_MANY, we can
* only try this once. Oh well.
*/
if ((err_action & SSQ_MANY) != 0)
scsi_test_unit_ready(&ccb->csio,
/*retries*/120,
camperiphdone,
MSG_SIMPLE_Q_TAG,
SSD_FULL_SIZE,
/*timeout*/5000);
else
scsi_test_unit_ready(&ccb->csio,
/*retries*/1,
camperiphdone,
MSG_SIMPLE_Q_TAG,
SSD_FULL_SIZE,
/*timeout*/5000);
/* release the queue after .5 sec. */
relsim_flags =
RELSIM_RELEASE_AFTER_TIMEOUT;
timeout = 500;
/*
* Drop the priority to 0 so that
* we are the first to execute. Also
* 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 let normal
* transactions go to the drive.
*/
ccb->ccb_h.pinfo.priority = 0;
ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
/*
* Save a pointer to the original
* CCB in the new CCB.
*/
ccb->ccb_h.saved_ccb_ptr = save_ccb;
error = ERESTART;
}
/*
* Send a start unit command to the device,
* and then retry the command. We only
* want to do this if the retry count has
* not been exhausted. If the user
* specified 0 retries, then we follow
* their request and do not retry.
*/
else if (((err_action & SS_MASK) == SS_START)
&& save_ccb != NULL
&& ccb->ccb_h.retry_count > 0) {
int le;
/*
* Only one error recovery action
* at a time. See above.
*/
if (periph->flags &
CAM_PERIPH_RECOVERY_INPROG) {
error = ERESTART;
break;
}
periph->flags |=
CAM_PERIPH_RECOVERY_INPROG;
/* decrement the number of retries */
retry = 1;
ccb->ccb_h.retry_count--;
/*
* Check for removable media and
* set load/eject flag
* appropriately.
*/
if (SID_IS_REMOVABLE(&cgd.inq_data))
le = TRUE;
else
le = FALSE;
/*
* Attempt to start the drive up.
*
* Save the current ccb so it can
* be restored and retried once the
* drive is started up.
*/
bcopy(ccb, save_ccb, sizeof(*save_ccb));
scsi_start_stop(&ccb->csio,
/*retries*/1,
camperiphdone,
MSG_SIMPLE_Q_TAG,
/*start*/TRUE,
/*load/eject*/le,
/*immediate*/FALSE,
SSD_FULL_SIZE,
/*timeout*/50000);
/*
* Drop the priority to 0 so that
* we are the first to execute. Also
* 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 let normal
* transactions go to the drive.
*/
ccb->ccb_h.pinfo.priority = 0;
ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
/*
* Save a pointer to the original
* CCB in the new CCB.
*/
ccb->ccb_h.saved_ccb_ptr = save_ccb;
error = ERESTART;
} else if ((sense_flags & SF_RETRY_UA) != 0) {
/*
* XXX KDM this is a *horrible*
* hack.
*/
error = scsi_interpret_sense(ccb,
sense_flags,
&relsim_flags,
&openings,
&timeout,
err_action);
}
/*
* Theoretically, this code should send a
* test unit ready to the given device, and
* if it returns and error, send a start
* unit command. Since we don't yet have
* the capability to do two-command error
* recovery, just send a start unit.
* XXX KDM fix this!
*/
else if (((err_action & SS_MASK) == SS_TURSTART)
&& save_ccb != NULL
&& ccb->ccb_h.retry_count > 0) {
int le;
/*
* Only one error recovery action
* at a time. See above.
*/
if (periph->flags &
CAM_PERIPH_RECOVERY_INPROG) {
error = ERESTART;
break;
}
periph->flags |=
CAM_PERIPH_RECOVERY_INPROG;
/* decrement the number of retries */
retry = 1;
ccb->ccb_h.retry_count--;
/*
* Check for removable media and
* set load/eject flag
* appropriately.
*/
if (SID_IS_REMOVABLE(&cgd.inq_data))
le = TRUE;
else
le = FALSE;
/*
* Attempt to start the drive up.
*
* Save the current ccb so it can
* be restored and retried once the
* drive is started up.
*/
bcopy(ccb, save_ccb, sizeof(*save_ccb));
scsi_start_stop(&ccb->csio,
/*retries*/1,
camperiphdone,
MSG_SIMPLE_Q_TAG,
/*start*/TRUE,
/*load/eject*/le,
/*immediate*/FALSE,
SSD_FULL_SIZE,
/*timeout*/50000);
/* release the queue after .5 sec. */
relsim_flags =
RELSIM_RELEASE_AFTER_TIMEOUT;
timeout = 500;
/*
* Drop the priority to 0 so that
* we are the first to execute. Also
* 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 let normal
* transactions go to the drive.
*/
ccb->ccb_h.pinfo.priority = 0;
ccb->ccb_h.flags |= CAM_DEV_QFREEZE;
/*
* Save a pointer to the original
* CCB in the new CCB.
*/
ccb->ccb_h.saved_ccb_ptr = save_ccb;
error = ERESTART;
} else {
error = scsi_interpret_sense(ccb,
sense_flags,
&relsim_flags,
&openings,
&timeout,
err_action);
}
} else if (ccb->csio.scsi_status ==
SCSI_STATUS_CHECK_COND
&& status != CAM_AUTOSENSE_FAIL) {
/* no point in decrementing the retry count */
panic("cam_periph_error: scsi status of "
"CHECK COND returned but no sense "
"information is availible. "
"Controller should have returned "
"CAM_AUTOSENSE_FAILED");
/* NOTREACHED */
error = EIO;
} else if (ccb->ccb_h.retry_count == 0) {
/*
* XXX KDM shouldn't there be a better
* argument to return??
*/
error = EIO;
} else {
/* decrement the number of retries */
retry = ccb->ccb_h.retry_count > 0;
if (retry)
ccb->ccb_h.retry_count--;
/*
* If it was aborted with no
* clue as to the reason, just
* retry it again.
*/
error = ERESTART;
}
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,
/*priority*/1);
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;
break;
}
/* FALLTHROUGH */
}
case SCSI_STATUS_BUSY:
/*
* Restart the queue after either another
* command completes or a 1 second timeout.
* If we have any retries left, that is.
*/
retry = ccb->ccb_h.retry_count > 0;
if (retry) {
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:
error = EIO;
break;
default:
error = EIO;
break;
}
break;
case CAM_REQ_CMP_ERR:
case CAM_CMD_TIMEOUT:
case CAM_UNEXP_BUSFREE:
case CAM_UNCOR_PARITY:
case CAM_DATA_RUN_ERR:
/* decrement the number of retries */
retry = ccb->ccb_h.retry_count > 0;
if (retry) {
ccb->ccb_h.retry_count--;
error = ERESTART;
} else {
error = EIO;
}
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:
{
/*
* XXX
* A single selection timeout should not be enough
* to invalidate a device. We should retry for multiple
* seconds assuming this isn't a probe. We'll probably
* need a special flag for that.
*/
#if 0
struct cam_path *newpath;
/* Should we do more if we can't create the path?? */
if (xpt_create_path(&newpath, xpt_path_periph(ccb->ccb_h.path),
xpt_path_path_id(ccb->ccb_h.path),
xpt_path_target_id(ccb->ccb_h.path),
CAM_LUN_WILDCARD) != CAM_REQ_CMP)
break;
/*
* Let peripheral drivers know that this device has gone
* away.
*/
xpt_async(AC_LOST_DEVICE, newpath, NULL);
xpt_free_path(newpath);
#endif
if ((sense_flags & SF_RETRY_SELTO) != 0) {
retry = ccb->ccb_h.retry_count > 0;
if (retry) {
ccb->ccb_h.retry_count--;
error = ERESTART;
/*
* Wait half a second to give the device
* time to recover before we try again.
*/
relsim_flags = RELSIM_RELEASE_AFTER_TIMEOUT;
timeout = 500;
} else {
error = ENXIO;
}
} else {
error = ENXIO;
}
break;
}
case CAM_REQ_INVALID:
case CAM_PATH_INVALID:
case CAM_DEV_NOT_THERE:
case CAM_NO_HBA:
case CAM_PROVIDE_FAIL:
case CAM_REQ_TOO_BIG:
error = EINVAL;
break;
case CAM_SCSI_BUS_RESET:
case CAM_BDR_SENT:
case CAM_REQUEUE_REQ:
/* Unconditional requeue, dammit */
error = ERESTART;
break;
case CAM_RESRC_UNAVAIL:
case CAM_BUSY:
/* timeout??? */
default:
/* decrement the number of retries */
retry = ccb->ccb_h.retry_count > 0;
if (retry) {
ccb->ccb_h.retry_count--;
error = ERESTART;
} else {
/* Check the sense codes */
error = EIO;
}
break;
}
/* 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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