environ.c revision 29949e866e40b95795203f3ee46f44a197c946e4
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2002 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/ddi_impldefs.h>
#include <sys/obpdefs.h>
#include <sys/cmn_err.h>
#include <sys/errno.h>
#include <sys/kmem.h>
#include <sys/debug.h>
#include <sys/sysmacros.h>
#include <sys/ivintr.h>
#include <sys/callb.h>
#include <sys/autoconf.h>
#include <sys/intreg.h>
#include <sys/modctl.h>
#include <sys/proc.h>
#include <sys/disp.h>
#include <sys/fhc.h>
#include <sys/environ.h>
/* Useful debugging Stuff */
#include <sys/nexusdebug.h>
/*
* Function prototypes
*/
static int environ_attach(dev_info_t *devi, ddi_attach_cmd_t cmd);
static int environ_detach(dev_info_t *devi, ddi_detach_cmd_t cmd);
static int environ_init(struct environ_soft_state *softsp);
void environ_add_temp_kstats(struct environ_soft_state *softsp);
static void overtemp_wakeup(void *);
static void environ_overtemp_poll(void);
/*
* Configuration data structures
*/
static struct cb_ops environ_cb_ops = {
nulldev, /* open */
nulldev, /* close */
nulldev, /* strategy */
nulldev, /* print */
nodev, /* dump */
nulldev, /* read */
nulldev, /* write */
nulldev, /* ioctl */
nodev, /* devmap */
nodev, /* mmap */
nodev, /* segmap */
nochpoll, /* poll */
ddi_prop_op, /* cb_prop_op */
0, /* streamtab */
D_MP | D_NEW | D_HOTPLUG, /* Driver compatibility flag */
CB_REV, /* rev */
nodev, /* cb_aread */
nodev /* cb_awrite */
};
static struct dev_ops environ_ops = {
DEVO_REV, /* devo_rev, */
0, /* refcnt */
ddi_no_info, /* getinfo */
nulldev, /* identify */
nulldev, /* probe */
environ_attach, /* attach */
environ_detach, /* detach */
nulldev, /* reset */
&environ_cb_ops, /* cb_ops */
(struct bus_ops *)0, /* bus_ops */
nulldev /* power */
};
void *environp; /* environ soft state hook */
/*
* Mutex used to protect the soft state list and their data.
*/
static kmutex_t overtemp_mutex;
/* The CV is used to wakeup the thread when needed. */
static kcondvar_t overtemp_cv;
/* linked list of all environ soft states */
struct environ_soft_state *tempsp_list = NULL;
/* overtemp polling routine timeout delay */
static int overtemp_timeout_sec = OVERTEMP_TIMEOUT_SEC;
/* Should the environ_overtemp_poll thread be running? */
static int environ_do_overtemp_thread = 1;
/* Indicates whether or not the overtemp thread has been started */
static int environ_overtemp_thread_started = 0;
extern struct mod_ops mod_driverops;
static struct modldrv modldrv = {
&mod_driverops, /* module type, this one is a driver */
"Environment Leaf v%I%", /* name of module */
&environ_ops, /* driver ops */
};
static struct modlinkage modlinkage = {
MODREV_1,
(void *)&modldrv,
NULL
};
#ifndef lint
static char _depends_on[] = "drv/fhc";
#endif /* lint */
/*
* These are the module initialization routines.
*/
int
_init(void)
{
int error;
if ((error = ddi_soft_state_init(&environp,
sizeof (struct environ_soft_state), 1)) != 0)
return (error);
return (mod_install(&modlinkage));
}
int
_fini(void)
{
int error;
if ((error = mod_remove(&modlinkage)) != 0)
return (error);
ddi_soft_state_fini(&environp);
return (0);
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&modlinkage, modinfop));
}
static int
environ_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
{
struct environ_soft_state *softsp;
int instance;
switch (cmd) {
case DDI_ATTACH:
break;
case DDI_RESUME:
return (DDI_SUCCESS);
default:
return (DDI_FAILURE);
}
instance = ddi_get_instance(devi);
if (ddi_soft_state_zalloc(environp, instance) != DDI_SUCCESS)
return (DDI_FAILURE);
softsp = ddi_get_soft_state(environp, instance);
/* Set the dip in the soft state */
softsp->dip = devi;
/*
* The DDI documentation on ddi_getprop() routine says that
* you should always use the real dev_t when calling it,
* but all calls found in uts use either DDI_DEV_T_ANY
* or DDI_DEV_T_NONE. No notes either on how to find the real
* dev_t. So we are doing it in two steps.
*/
softsp->pdip = ddi_get_parent(softsp->dip);
if ((softsp->board = (int)ddi_getprop(DDI_DEV_T_ANY, softsp->pdip,
DDI_PROP_DONTPASS, OBP_BOARDNUM, -1)) == -1) {
cmn_err(CE_WARN, "environ%d: unable to retrieve %s property",
instance, OBP_BOARDNUM);
goto bad;
}
DPRINTF(ENVIRON_ATTACH_DEBUG, ("environ: devi= 0x%p\n, softsp=0x%p,",
devi, softsp));
/*
* Init the temperature device here. We start the overtemp
* polling thread here.
*/
if (environ_init(softsp) != DDI_SUCCESS)
goto bad;
/* nothing to suspend/resume here */
(void) ddi_prop_update_string(DDI_DEV_T_NONE, devi,
"pm-hardware-state", "no-suspend-resume");
ddi_report_dev(devi);
if (environ_overtemp_thread_started == 0) {
/*
* set up the overtemp mutex and condition variable before
* starting the thread.
*/
mutex_init(&overtemp_mutex, NULL, MUTEX_DEFAULT, NULL);
cv_init(&overtemp_cv, NULL, CV_DRIVER, NULL);
/* Start the overtemp polling thread now. */
(void) thread_create(NULL, 0, (void (*)())environ_overtemp_poll,
NULL, 0, &p0, TS_RUN, minclsyspri);
environ_overtemp_thread_started++;
}
(void) fhc_bdlist_lock(softsp->board);
fhc_bd_env_set(softsp->board, (void *)softsp);
fhc_bdlist_unlock();
return (DDI_SUCCESS);
bad:
ddi_soft_state_free(environp, instance);
return (DDI_FAILURE);
}
/* ARGSUSED */
static int
environ_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
{
int instance;
struct environ_soft_state *softsp;
struct environ_soft_state **vect; /* used in list deletion */
struct environ_soft_state *temp; /* used in list deletion */
/* get the instance of this devi */
instance = ddi_get_instance(devi);
/* get the soft state pointer for this device node */
softsp = ddi_get_soft_state(environp, instance);
switch (cmd) {
case DDI_SUSPEND:
return (DDI_SUCCESS);
case DDI_DETACH:
(void) fhc_bdlist_lock(softsp->board);
if (fhc_bd_detachable(softsp->board))
break;
else
fhc_bdlist_unlock();
/* FALLTHROUGH */
default:
return (DDI_FAILURE);
}
fhc_bd_env_set(softsp->board, NULL);
fhc_bdlist_unlock();
/* remove the environmental kstats if they were allocated */
if (softsp->environ_ksp)
kstat_delete(softsp->environ_ksp);
if (softsp->environ_oksp)
kstat_delete(softsp->environ_oksp);
/*
* remove from soft state pointer from the singly linked list of
* soft state pointers for temperature monitoring.
*/
mutex_enter(&overtemp_mutex);
/*
* find the soft state for this instance in the soft state list
* and remove it from the list
*/
for (temp = tempsp_list, vect = &tempsp_list; temp != NULL;
vect = &temp->next, temp = temp->next) {
if (temp == softsp) {
*vect = temp->next;
break;
}
}
mutex_exit(&overtemp_mutex);
/* unmap the registers (if they have been mapped) */
if (softsp->temp_reg)
ddi_unmap_regs(devi, 0, (caddr_t *)&softsp->temp_reg, 0, 0);
/* deallocate the soft state instance */
ddi_soft_state_free(environp, instance);
ddi_prop_remove_all(devi);
return (DDI_SUCCESS);
}
static int
environ_init(struct environ_soft_state *softsp)
{
uchar_t tmp;
/*
* If this environment node is on a CPU-less system board, i.e.,
* board type MEM_TYPE, then we do not want to map in, read
* the temperature register, create the polling entry for
* the overtemp polling thread, or create a kstat entry.
*
* The reason for this is that when no CPU modules are present
* on a CPU/Memory board, then the thermistors are not present,
* and the output of the A/D convertor is the max 8 bit value (0xFF)
*/
if (fhc_bd_type(softsp->board) == MEM_BOARD) {
return (DDI_SUCCESS);
}
/*
* Map in the temperature register. Once the temperature register
* is mapped, the timeout thread can read the temperature and
* update the temperature in the softsp.
*/
if (ddi_map_regs(softsp->dip, 0,
(caddr_t *)&softsp->temp_reg, 0, 0)) {
cmn_err(CE_WARN, "environ%d: unable to map temperature "
"register", ddi_get_instance(softsp->dip));
return (DDI_FAILURE);
}
/* Initialize the temperature */
init_temp_arrays(&softsp->tempstat);
/*
* Do a priming read on the ADC, and throw away the first value
* read. This is a feature of the ADC hardware. After a power cycle
* it does not contains valid data until a read occurs.
*/
tmp = *(softsp->temp_reg);
/* Wait 30 usec for ADC hardware to stabilize. */
DELAY(30);
#ifdef lint
tmp = tmp;
#endif
/*
* Now add this soft state structure to the front of the linked list
* of soft state structures.
*/
mutex_enter(&overtemp_mutex);
softsp->next = tempsp_list;
tempsp_list = softsp;
mutex_exit(&overtemp_mutex);
/* Create kstats for this instance of the environ driver */
environ_add_temp_kstats(softsp);
return (DDI_SUCCESS);
}
/* ARGSUSED */
static void
overtemp_wakeup(void *arg)
{
/*
* grab mutex to guarantee that our wakeup call
* arrives after we go to sleep -- so we can't sleep forever.
*/
mutex_enter(&overtemp_mutex);
cv_signal(&overtemp_cv);
mutex_exit(&overtemp_mutex);
}
/*
* This function polls all the system board digital temperature registers
* and stores them in the history buffers using the fhc driver support
* routines.
* The temperature detected must then be checked against our current
* policy for what to do in the case of overtemperature situations. We
* must also allow for manufacturing's use of a heat chamber.
*/
static void
environ_overtemp_poll(void)
{
struct environ_soft_state *list;
callb_cpr_t cprinfo;
CALLB_CPR_INIT(&cprinfo, &overtemp_mutex, callb_generic_cpr, "environ");
/* The overtemp data strcutures are protected by a mutex. */
mutex_enter(&overtemp_mutex);
while (environ_do_overtemp_thread) {
/*
* for each environment node that has been attached,
* read it and check for overtemp.
*/
for (list = tempsp_list; list != NULL; list = list->next) {
if (list->temp_reg == NULL) {
continue;
}
update_temp(list->pdip, &list->tempstat,
*(list->temp_reg));
}
CALLB_CPR_SAFE_BEGIN(&cprinfo);
/* now have this thread sleep for a while */
(void) timeout(overtemp_wakeup, NULL, overtemp_timeout_sec*hz);
cv_wait(&overtemp_cv, &overtemp_mutex);
CALLB_CPR_SAFE_END(&cprinfo, &overtemp_mutex);
}
CALLB_CPR_EXIT(&cprinfo);
thread_exit();
/* NOTREACHED */
}
void
environ_add_temp_kstats(struct environ_soft_state *softsp)
{
struct kstat *tksp;
struct kstat *ttsp; /* environ temperature test kstat */
/*
* Create the overtemp kstat required for the environment driver.
* The kstat instances are tagged with the physical board number
* instead of ddi instance number.
*/
if ((tksp = kstat_create("unix", softsp->board,
OVERTEMP_KSTAT_NAME, "misc", KSTAT_TYPE_RAW,
sizeof (struct temp_stats), KSTAT_FLAG_PERSISTENT)) == NULL) {
cmn_err(CE_WARN, "environ%d: temp kstat_create failed",
ddi_get_instance(softsp->dip));
} else {
tksp->ks_update = overtemp_kstat_update;
tksp->ks_private = (void *) &softsp->tempstat;
softsp->environ_ksp = tksp;
kstat_install(tksp);
}
/*
* Create the temperature override kstat, for testability.
* The kstat instances are tagged with the physical board number
* instead of ddi instance number.
*/
if ((ttsp = kstat_create("unix", softsp->board,
TEMP_OVERRIDE_KSTAT_NAME, "misc", KSTAT_TYPE_RAW, sizeof (short),
KSTAT_FLAG_PERSISTENT | KSTAT_FLAG_WRITABLE)) == NULL) {
cmn_err(CE_WARN, "environ%d: temp override kstat_create failed",
ddi_get_instance(softsp->dip));
} else {
ttsp->ks_update = temp_override_kstat_update;
ttsp->ks_private = (void *) &softsp->tempstat.override;
softsp->environ_oksp = ttsp;
kstat_install(ttsp);
}
}