static void
dr_resume_devices(dev_info_t *start, dr_sr_handle_t *srh)
{
dr_handle_t *handle;
dev_info_t *dip, *next, *last = NULL;
major_t major;
char *bn;
int circ;
major = (major_t)-1;
/* attach in reverse device tree order */
while (last != start) {
dip = start;
next = ddi_get_next_sibling(dip);
while (next != last && dip != srh->sr_failed_dip) {
dip = next;
next = ddi_get_next_sibling(dip);
}
if (dip == srh->sr_failed_dip) {
/* release hold acquired in dr_suspend_devices() */
srh->sr_failed_dip = NULL;
ndi_rele_devi(dip);
} else if (dr_is_real_device(dip) &&
srh->sr_failed_dip == NULL) {
if ((bn = ddi_binding_name(dip)) != NULL) {
major = ddi_name_to_major(bn);
} else {
bn = "<null>";
}
if (!dr_bypass_device(bn) &&
!drmach_verify_sr(dip, 0)) {
char d_name[40], d_alias[40], *d_info;
d_name[0] = 0;
d_info = ddi_get_name_addr(dip);
if (d_info == NULL)
d_info = "<null>";
if (!dr_resolve_devname(dip, d_name,
d_alias)) {
if (d_alias[0] != 0) {
prom_printf("\tresuming "
"%s@%s (aka %s)\n",
d_name, d_info,
d_alias);
} else {
prom_printf("\tresuming "
"%s@%s\n",
d_name, d_info);
}
} else {
prom_printf("\tresuming %s@%s\n",
bn, d_info);
}
if (devi_attach(dip, DDI_RESUME) !=
DDI_SUCCESS) {
/*
* Print a console warning,
* set an e_code of ESBD_RESUME,
* and save the driver major
* number in the e_rsc.
*/
prom_printf("\tFAILED to resume %s@%s",
d_name[0] ? d_name : bn, d_info);
srh->sr_err_idx =
dr_add_int(srh->sr_err_ints,
srh->sr_err_idx, DR_MAX_ERR_INT,
(uint64_t)major);
handle = srh->sr_dr_handlep;
dr_op_err(CE_IGNORE, handle,
ESBD_RESUME, "%s@%s",
d_name[0] ? d_name : bn, d_info);
}
}
}
/* Hold parent busy while walking its children */
ndi_devi_enter(dip, &circ);
dr_resume_devices(ddi_get_child(dip), srh);
ndi_devi_exit(dip, circ);
last = dip;
}
}
static void
sbdp_resume_devices(dev_info_t *start, sbdp_sr_handle_t *srh)
{
int circ;
dev_info_t *dip, *next, *last = NULL;
char *bn;
sbd_error_t *sep;
sep = &srh->sep;
/* attach in reverse device tree order */
while (last != start) {
dip = start;
next = ddi_get_next_sibling(dip);
while (next != last && dip != SR_FAILED_DIP(srh)) {
dip = next;
next = ddi_get_next_sibling(dip);
}
if (dip == SR_FAILED_DIP(srh)) {
/* Release hold acquired in sbdp_suspend_devices() */
ndi_rele_devi(dip);
SR_FAILED_DIP(srh) = NULL;
} else if (sbdp_is_real_device(dip) &&
SR_FAILED_DIP(srh) == NULL) {
if (DEVI(dip)->devi_binding_name != NULL) {
bn = ddi_binding_name(dip);
}
#ifdef DEBUG
if (!sbdp_bypass_device(bn)) {
#else
{
#endif
char d_name[40], d_alias[40], *d_info;
d_name[0] = 0;
d_info = ddi_get_name_addr(dip);
if (d_info == NULL)
d_info = "<null>";
if (!sbdp_resolve_devname(dip, d_name,
d_alias)) {
if (d_alias[0] != 0) {
SBDP_DBG_QR("\tresuming "
"%s@%s (aka %s)\n",
d_name, d_info,
d_alias);
} else {
SBDP_DBG_QR("\tresuming "
"%s@%s\n",
d_name, d_info);
}
} else {
SBDP_DBG_QR("\tresuming %s@%s\n",
bn, d_info);
}
if (devi_attach(dip, DDI_RESUME) !=
DDI_SUCCESS) {
/*
* Print a console warning,
* set an errno of ESGT_RESUME,
* and save the driver major
* number in the e_str.
*/
(void) sprintf(sbdp_get_err_buf(sep),
"%s@%s",
d_name[0] ? d_name : bn, d_info);
SBDP_DBG_QR("\tFAILED to resume "
"%s\n", sbdp_get_err_buf(sep));
sbdp_set_err(sep,
ESGT_RESUME, NULL);
}
}
}
ndi_devi_enter(dip, &circ);
sbdp_resume_devices(ddi_get_child(dip), srh);
ndi_devi_exit(dip, circ);
last = dip;
}
}
/*
* True if thread is virtually stopped. Similar to CPR_VSTOPPED
* but from DR point of view. These user threads are waiting in
* the kernel. Once they return from kernel, they will process
* the stop signal and stop.
*/
#define SBDP_VSTOPPED(t) \
((t)->t_state == TS_SLEEP && \
(t)->t_wchan != NULL && \
(t)->t_astflag && \
((t)->t_proc_flag & TP_CHKPT))
static int
sbdp_stop_user_threads(sbdp_sr_handle_t *srh)
{
int count;
char cache_psargs[PSARGSZ];
kthread_id_t cache_tp;
uint_t cache_t_state;
int bailout;
sbd_error_t *sep;
kthread_id_t tp;
extern void add_one_utstop();
extern void utstop_timedwait(clock_t);
extern void utstop_init(void);
#define SBDP_UTSTOP_RETRY 4
#define SBDP_UTSTOP_WAIT hz
if (sbdp_skip_user_threads)
return (DDI_SUCCESS);
sep = &srh->sep;
ASSERT(sep);
utstop_init();
/* we need to try a few times to get past fork, etc. */
for (count = 0; count < SBDP_UTSTOP_RETRY; count++) {
/* walk the entire threadlist */
mutex_enter(&pidlock);
for (tp = curthread->t_next; tp != curthread; tp = tp->t_next) {
proc_t *p = ttoproc(tp);
/* handle kernel threads separately */
if (p->p_as == &kas || p->p_stat == SZOMB)
continue;
mutex_enter(&p->p_lock);
thread_lock(tp);
if (tp->t_state == TS_STOPPED) {
/* add another reason to stop this thread */
tp->t_schedflag &= ~TS_RESUME;
} else {
tp->t_proc_flag |= TP_CHKPT;
thread_unlock(tp);
mutex_exit(&p->p_lock);
add_one_utstop();
mutex_enter(&p->p_lock);
thread_lock(tp);
aston(tp);
if (ISWAKEABLE(tp) || ISWAITING(tp)) {
setrun_locked(tp);
}
}
/* grab thread if needed */
if (tp->t_state == TS_ONPROC && tp->t_cpu != CPU)
poke_cpu(tp->t_cpu->cpu_id);
thread_unlock(tp);
mutex_exit(&p->p_lock);
}
mutex_exit(&pidlock);
/* let everything catch up */
utstop_timedwait(count * count * SBDP_UTSTOP_WAIT);
/* now, walk the threadlist again to see if we are done */
mutex_enter(&pidlock);
for (tp = curthread->t_next, bailout = 0;
tp != curthread; tp = tp->t_next) {
proc_t *p = ttoproc(tp);
/* handle kernel threads separately */
if (p->p_as == &kas || p->p_stat == SZOMB)
continue;
/*
* If this thread didn't stop, and we don't allow
* unstopped blocked threads, bail.
*/
thread_lock(tp);
if (!CPR_ISTOPPED(tp) &&
!(sbdp_allow_blocked_threads &&
SBDP_VSTOPPED(tp))) {
/* nope, cache the details for later */
bcopy(p->p_user.u_psargs, cache_psargs,
sizeof (cache_psargs));
cache_tp = tp;
cache_t_state = tp->t_state;
bailout = 1;
}
thread_unlock(tp);
}
mutex_exit(&pidlock);
/* were all the threads stopped? */
if (!bailout)
break;
}
/* were we unable to stop all threads after a few tries? */
if (bailout) {
cmn_err(CE_NOTE, "process: %s id: %p state: %x\n",
cache_psargs, cache_tp, cache_t_state);
(void) sprintf(sbdp_get_err_buf(sep), "%s", cache_psargs);
sbdp_set_err(sep, ESGT_UTHREAD, NULL);
return (ESRCH);
}
return (DDI_SUCCESS);
}
/*
* Init and attach the root node. root node is the first one to be
* attached, so the process is somewhat "handcrafted".
*/
void
i_ddi_init_root()
{
#ifdef DDI_PROP_DEBUG
(void) ddi_prop_debug(1); /* Enable property debugging */
#endif /* DDI_PROP_DEBUG */
/*
* Initialize root node
*/
if (impl_ddi_sunbus_initchild(top_devinfo) != DDI_SUCCESS)
panic("Could not initialize root nexus");
/*
* Attach root node (no need to probe)
* Hold both devinfo and rootnex driver so they can't go away.
*/
DEVI(top_devinfo)->devi_ops = ndi_hold_driver(top_devinfo);
ASSERT(DEV_OPS_HELD(DEVI(top_devinfo)->devi_ops));
DEVI(top_devinfo)->devi_instance = e_ddi_assign_instance(top_devinfo);
(void) i_ddi_load_drvconf(DEVI(top_devinfo)->devi_major);
mutex_enter(&(DEVI(top_devinfo)->devi_lock));
DEVI_SET_ATTACHING(top_devinfo);
mutex_exit(&(DEVI(top_devinfo)->devi_lock));
if (devi_attach(top_devinfo, DDI_ATTACH) != DDI_SUCCESS)
panic("Could not attach root nexus");
mutex_enter(&(DEVI(top_devinfo)->devi_lock));
DEVI_CLR_ATTACHING(top_devinfo);
mutex_exit(&(DEVI(top_devinfo)->devi_lock));
mutex_init(&global_vhci_lock, NULL, MUTEX_DEFAULT, NULL);
ndi_hold_devi(top_devinfo); /* hold it forever */
i_ddi_set_node_state(top_devinfo, DS_READY);
/*
* Now, expand .conf children of root
*/
(void) i_ndi_make_spec_children(top_devinfo, 0);
/*
* Must be set up before attaching root or pseudo drivers
*/
pm_init_locks();
/*
* Attach options dip
*/
options_dip = i_ddi_attach_pseudo_node("options");
/*
* Attach pseudo nexus and enumerate its children
*/
pseudo_dip = i_ddi_attach_pseudo_node(DEVI_PSEUDO_NEXNAME);
(void) i_ndi_make_spec_children(pseudo_dip, 0);
/*
* Attach and hold clone dip
*/
clone_dip = i_ddi_attach_pseudo_node("clone");
clone_major = ddi_driver_major(clone_dip);
mm_major = ddi_name_to_major("mm");
nulldriver_major = ddi_name_to_major("nulldriver");
/*
* Attach scsi_vhci for MPXIO, this registers scsi vhci class
* with the MPXIO framework.
*/
scsi_vhci_dip = i_ddi_attach_pseudo_node("scsi_vhci");
}
int
xen_resume_devices(dev_info_t *start, int resume_failed)
{
dev_info_t *dip, *next, *last = NULL;
int did_suspend;
int error = resume_failed;
char buf[XPV_BUFSIZE];
SUSPEND_DEBUG("xen_resume_devices\n");
while (last != start) {
dip = start;
next = ddi_get_next_sibling(dip);
while (next != last) {
dip = next;
next = ddi_get_next_sibling(dip);
}
/*
* cpr is the only one that uses this field and the device
* itself hasn't resumed yet, there is no need to use a
* lock, even though kernel threads are active by now.
*/
did_suspend = DEVI(dip)->devi_cpr_flags & DCF_CPR_SUSPENDED;
if (did_suspend)
DEVI(dip)->devi_cpr_flags &= ~DCF_CPR_SUSPENDED;
/*
* There may be background attaches happening on devices
* that were not originally suspended by cpr, so resume
* only devices that were suspended by cpr. Also, stop
* resuming after the first resume failure, but traverse
* the entire tree to clear the suspend flag.
*/
if (did_suspend && !error) {
SUSPEND_DEBUG("Resuming device %s\n",
ddi_deviname(dip, buf));
/*
* If a device suspended by cpr gets detached during
* the resume process (for example, due to hotplugging)
* before cpr gets around to issuing it a DDI_RESUME,
* we'll have problems.
*/
if (!i_ddi_devi_attached(dip)) {
cmn_err(CE_WARN, "Skipping %s, device "
"not ready for resume",
ddi_deviname(dip, buf));
} else {
if (devi_attach(dip, DDI_RESUME) !=
DDI_SUCCESS) {
error = ENXIO;
}
}
}
if (error == ENXIO) {
cmn_err(CE_WARN, "Unable to resume device %s",
ddi_deviname(dip, buf));
}
error = xen_resume_devices(ddi_get_child(dip), error);
last = dip;
}
return (error);
}
