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d8b0556c6d
freebsd-skq/sys/i386/acpica/acpi_machdep.c
Konstantin Belousov d8b0556c6d Adapt vfs kqfilter to the shared vnode lock used by zfs write vop. Use 
vnode interlock to protect the knote fields [1]. The locking assumes
that shared vnode lock is held, thus we get exclusive access to knote
either by exclusive vnode lock protection, or by shared vnode lock +
vnode interlock.

Do not use kl_locked() method to assert either lock ownership or the
fact that curthread does not own the lock. For shared locks, ownership
is not recorded, e.g. VOP_ISLOCKED can return LK_SHARED for the shared
lock not owned by curthread, causing false positives in kqueue subsystem
assertions about knlist lock.

Remove kl_locked method from knlist lock vector, and add two separate
assertion methods kl_assert_locked and kl_assert_unlocked, that are
supposed to use proper asserts. Change knlist_init accordingly.

Add convenience function knlist_init_mtx to reduce number of arguments
for typical knlist initialization.

Submitted by:	jhb [1]
Noted by:	jhb [2]
Reviewed by:	jhb
Tested by:	rnoland
2009-06-10 20:59:32 +00:00

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/*-
* Copyright (c) 2001 Mitsuru IWASAKI
* 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.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 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/bus.h>
#include <sys/condvar.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/poll.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <contrib/dev/acpica/include/acpi.h>
#include <dev/acpica/acpivar.h>
#include <dev/acpica/acpiio.h>
#include <machine/nexusvar.h>
/*
* APM driver emulation
*/
#include <machine/apm_bios.h>
#include <machine/pc/bios.h>
#include <i386/bios/apm.h>
SYSCTL_DECL(_debug_acpi);
uint32_t acpi_resume_beep;
TUNABLE_INT("debug.acpi.resume_beep", &acpi_resume_beep);
SYSCTL_UINT(_debug_acpi, OID_AUTO, resume_beep, CTLFLAG_RW, &acpi_resume_beep,
0, "Beep the PC speaker when resuming");
uint32_t acpi_reset_video;
TUNABLE_INT("hw.acpi.reset_video", &acpi_reset_video);
static int intr_model = ACPI_INTR_PIC;
static int apm_active;
static struct clonedevs *apm_clones;
MALLOC_DEFINE(M_APMDEV, "apmdev", "APM device emulation");
static d_open_t apmopen;
static d_close_t apmclose;
static d_write_t apmwrite;
static d_ioctl_t apmioctl;
static d_poll_t apmpoll;
static d_kqfilter_t apmkqfilter;
static void apmreadfiltdetach(struct knote *kn);
static int apmreadfilt(struct knote *kn, long hint);
static struct filterops apm_readfiltops =
{ 1, NULL, apmreadfiltdetach, apmreadfilt };
static struct cdevsw apm_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_TRACKCLOSE | D_NEEDMINOR,
.d_open = apmopen,
.d_close = apmclose,
.d_write = apmwrite,
.d_ioctl = apmioctl,
.d_poll = apmpoll,
.d_name = "apm",
.d_kqfilter = apmkqfilter
};
static int
acpi_capm_convert_battstate(struct acpi_battinfo *battp)
{
int state;
state = APM_UNKNOWN;
if (battp->state & ACPI_BATT_STAT_DISCHARG) {
if (battp->cap >= 50)
state = 0; /* high */
else
state = 1; /* low */
}
if (battp->state & ACPI_BATT_STAT_CRITICAL)
state = 2; /* critical */
if (battp->state & ACPI_BATT_STAT_CHARGING)
state = 3; /* charging */
/* If still unknown, determine it based on the battery capacity. */
if (state == APM_UNKNOWN) {
if (battp->cap >= 50)
state = 0; /* high */
else
state = 1; /* low */
}
return (state);
}
static int
acpi_capm_convert_battflags(struct acpi_battinfo *battp)
{
int flags;
flags = 0;
if (battp->cap >= 50)
flags |= APM_BATT_HIGH;
else {
if (battp->state & ACPI_BATT_STAT_CRITICAL)
flags |= APM_BATT_CRITICAL;
else
flags |= APM_BATT_LOW;
}
if (battp->state & ACPI_BATT_STAT_CHARGING)
flags |= APM_BATT_CHARGING;
if (battp->state == ACPI_BATT_STAT_NOT_PRESENT)
flags = APM_BATT_NOT_PRESENT;
return (flags);
}
static int
acpi_capm_get_info(apm_info_t aip)
{
int acline;
struct acpi_battinfo batt;
aip->ai_infoversion = 1;
aip->ai_major = 1;
aip->ai_minor = 2;
aip->ai_status = apm_active;
aip->ai_capabilities= 0xff00; /* unknown */
if (acpi_acad_get_acline(&acline))
aip->ai_acline = APM_UNKNOWN; /* unknown */
else
aip->ai_acline = acline; /* on/off */
if (acpi_battery_get_battinfo(NULL, &batt) != 0) {
aip->ai_batt_stat = APM_UNKNOWN;
aip->ai_batt_life = APM_UNKNOWN;
aip->ai_batt_time = -1; /* unknown */
aip->ai_batteries = ~0U; /* unknown */
} else {
aip->ai_batt_stat = acpi_capm_convert_battstate(&batt);
aip->ai_batt_life = batt.cap;
aip->ai_batt_time = (batt.min == -1) ? -1 : batt.min * 60;
aip->ai_batteries = acpi_battery_get_units();
}
return (0);
}
static int
acpi_capm_get_pwstatus(apm_pwstatus_t app)
{
device_t dev;
int acline, unit, error;
struct acpi_battinfo batt;
if (app->ap_device != PMDV_ALLDEV &&
(app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL))
return (1);
if (app->ap_device == PMDV_ALLDEV)
error = acpi_battery_get_battinfo(NULL, &batt);
else {
unit = app->ap_device - PMDV_BATT0;
dev = devclass_get_device(devclass_find("battery"), unit);
if (dev != NULL)
error = acpi_battery_get_battinfo(dev, &batt);
else
error = ENXIO;
}
if (error)
return (1);
app->ap_batt_stat = acpi_capm_convert_battstate(&batt);
app->ap_batt_flag = acpi_capm_convert_battflags(&batt);
app->ap_batt_life = batt.cap;
app->ap_batt_time = (batt.min == -1) ? -1 : batt.min * 60;
if (acpi_acad_get_acline(&acline))
app->ap_acline = APM_UNKNOWN;
else
app->ap_acline = acline; /* on/off */
return (0);
}
/* Create single-use devices for /dev/apm and /dev/apmctl. */
static void
apm_clone(void *arg, struct ucred *cred, char *name, int namelen,
struct cdev **dev)
{
int ctl_dev, unit;
if (*dev != NULL)
return;
if (strcmp(name, "apmctl") == 0)
ctl_dev = TRUE;
else if (strcmp(name, "apm") == 0)
ctl_dev = FALSE;
else
return;
/* Always create a new device and unit number. */
unit = -1;
if (clone_create(&apm_clones, &apm_cdevsw, &unit, dev, 0)) {
if (ctl_dev) {
*dev = make_dev(&apm_cdevsw, unit,
UID_ROOT, GID_OPERATOR, 0660, "apmctl%d", unit);
} else {
*dev = make_dev(&apm_cdevsw, unit,
UID_ROOT, GID_OPERATOR, 0664, "apm%d", unit);
}
if (*dev != NULL) {
dev_ref(*dev);
(*dev)->si_flags |= SI_CHEAPCLONE;
}
}
}
/* Create a struct for tracking per-device suspend notification. */
static struct apm_clone_data *
apm_create_clone(struct cdev *dev, struct acpi_softc *acpi_sc)
{
struct apm_clone_data *clone;
clone = malloc(sizeof(*clone), M_APMDEV, M_WAITOK);
clone->cdev = dev;
clone->acpi_sc = acpi_sc;
clone->notify_status = APM_EV_NONE;
bzero(&clone->sel_read, sizeof(clone->sel_read));
knlist_init_mtx(&clone->sel_read.si_note, &acpi_mutex);
/*
* The acpi device is always managed by devd(8) and is considered
* writable (i.e., ack is required to allow suspend to proceed.)
*/
if (strcmp("acpi", devtoname(dev)) == 0)
clone->flags = ACPI_EVF_DEVD | ACPI_EVF_WRITE;
else
clone->flags = ACPI_EVF_NONE;
ACPI_LOCK(acpi);
STAILQ_INSERT_TAIL(&acpi_sc->apm_cdevs, clone, entries);
ACPI_UNLOCK(acpi);
return (clone);
}
static int
apmopen(struct cdev *dev, int flag, int fmt, struct thread *td)
{
struct acpi_softc *acpi_sc;
struct apm_clone_data *clone;
acpi_sc = devclass_get_softc(devclass_find("acpi"), 0);
clone = apm_create_clone(dev, acpi_sc);
dev->si_drv1 = clone;
/* If the device is opened for write, record that. */
if ((flag & FWRITE) != 0)
clone->flags |= ACPI_EVF_WRITE;
return (0);
}
static int
apmclose(struct cdev *dev, int flag, int fmt, struct thread *td)
{
struct apm_clone_data *clone;
struct acpi_softc *acpi_sc;
clone = dev->si_drv1;
acpi_sc = clone->acpi_sc;
/* We are about to lose a reference so check if suspend should occur */
if (acpi_sc->acpi_next_sstate != 0 &&
clone->notify_status != APM_EV_ACKED)
acpi_AckSleepState(clone, 0);
/* Remove this clone's data from the list and free it. */
ACPI_LOCK(acpi);
STAILQ_REMOVE(&acpi_sc->apm_cdevs, clone, apm_clone_data, entries);
knlist_destroy(&clone->sel_read.si_note);
ACPI_UNLOCK(acpi);
free(clone, M_APMDEV);
destroy_dev_sched(dev);
return (0);
}
static int
apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
{
int error;
struct apm_clone_data *clone;
struct acpi_softc *acpi_sc;
struct apm_info info;
struct apm_event_info *ev_info;
apm_info_old_t aiop;
error = 0;
clone = dev->si_drv1;
acpi_sc = clone->acpi_sc;
switch (cmd) {
case APMIO_SUSPEND:
if ((flag & FWRITE) == 0)
return (EPERM);
if (acpi_sc->acpi_next_sstate == 0) {
if (acpi_sc->acpi_suspend_sx != ACPI_STATE_S5) {
error = acpi_ReqSleepState(acpi_sc,
acpi_sc->acpi_suspend_sx);
} else {
printf(
"power off via apm suspend not supported\n");
error = ENXIO;
}
} else
error = acpi_AckSleepState(clone, 0);
break;
case APMIO_STANDBY:
if ((flag & FWRITE) == 0)
return (EPERM);
if (acpi_sc->acpi_next_sstate == 0) {
if (acpi_sc->acpi_standby_sx != ACPI_STATE_S5) {
error = acpi_ReqSleepState(acpi_sc,
acpi_sc->acpi_standby_sx);
} else {
printf(
"power off via apm standby not supported\n");
error = ENXIO;
}
} else
error = acpi_AckSleepState(clone, 0);
break;
case APMIO_NEXTEVENT:
printf("apm nextevent start\n");
ACPI_LOCK(acpi);
if (acpi_sc->acpi_next_sstate != 0 && clone->notify_status ==
APM_EV_NONE) {
ev_info = (struct apm_event_info *)addr;
if (acpi_sc->acpi_next_sstate <= ACPI_STATE_S3)
ev_info->type = PMEV_STANDBYREQ;
else
ev_info->type = PMEV_SUSPENDREQ;
ev_info->index = 0;
clone->notify_status = APM_EV_NOTIFIED;
printf("apm event returning %d\n", ev_info->type);
} else
error = EAGAIN;
ACPI_UNLOCK(acpi);
break;
case APMIO_GETINFO_OLD:
if (acpi_capm_get_info(&info))
error = ENXIO;
aiop = (apm_info_old_t)addr;
aiop->ai_major = info.ai_major;
aiop->ai_minor = info.ai_minor;
aiop->ai_acline = info.ai_acline;
aiop->ai_batt_stat = info.ai_batt_stat;
aiop->ai_batt_life = info.ai_batt_life;
aiop->ai_status = info.ai_status;
break;
case APMIO_GETINFO:
if (acpi_capm_get_info((apm_info_t)addr))
error = ENXIO;
break;
case APMIO_GETPWSTATUS:
if (acpi_capm_get_pwstatus((apm_pwstatus_t)addr))
error = ENXIO;
break;
case APMIO_ENABLE:
if ((flag & FWRITE) == 0)
return (EPERM);
apm_active = 1;
break;
case APMIO_DISABLE:
if ((flag & FWRITE) == 0)
return (EPERM);
apm_active = 0;
break;
case APMIO_HALTCPU:
break;
case APMIO_NOTHALTCPU:
break;
case APMIO_DISPLAY:
if ((flag & FWRITE) == 0)
return (EPERM);
break;
case APMIO_BIOS:
if ((flag & FWRITE) == 0)
return (EPERM);
bzero(addr, sizeof(struct apm_bios_arg));
break;
default:
error = EINVAL;
break;
}
return (error);
}
static int
apmwrite(struct cdev *dev, struct uio *uio, int ioflag)
{
return (uio->uio_resid);
}
static int
apmpoll(struct cdev *dev, int events, struct thread *td)
{
struct apm_clone_data *clone;
int revents;
revents = 0;
ACPI_LOCK(acpi);
clone = dev->si_drv1;
if (clone->acpi_sc->acpi_next_sstate)
revents |= events & (POLLIN | POLLRDNORM);
else
selrecord(td, &clone->sel_read);
ACPI_UNLOCK(acpi);
return (revents);
}
static int
apmkqfilter(struct cdev *dev, struct knote *kn)
{
struct apm_clone_data *clone;
ACPI_LOCK(acpi);
clone = dev->si_drv1;
kn->kn_hook = clone;
kn->kn_fop = &apm_readfiltops;
knlist_add(&clone->sel_read.si_note, kn, 0);
ACPI_UNLOCK(acpi);
return (0);
}
static void
apmreadfiltdetach(struct knote *kn)
{
struct apm_clone_data *clone;
ACPI_LOCK(acpi);
clone = kn->kn_hook;
knlist_remove(&clone->sel_read.si_note, kn, 0);
ACPI_UNLOCK(acpi);
}
static int
apmreadfilt(struct knote *kn, long hint)
{
struct apm_clone_data *clone;
int sleeping;
ACPI_LOCK(acpi);
clone = kn->kn_hook;
sleeping = clone->acpi_sc->acpi_next_sstate ? 1 : 0;
ACPI_UNLOCK(acpi);
return (sleeping);
}
int
acpi_machdep_init(device_t dev)
{
struct acpi_softc *acpi_sc;
acpi_sc = devclass_get_softc(devclass_find("acpi"), 0);
/* Create a clone for /dev/acpi also. */
STAILQ_INIT(&acpi_sc->apm_cdevs);
acpi_sc->acpi_clone = apm_create_clone(acpi_sc->acpi_dev_t, acpi_sc);
clone_setup(&apm_clones);
EVENTHANDLER_REGISTER(dev_clone, apm_clone, 0, 1000);
acpi_install_wakeup_handler(acpi_sc);
if (intr_model == ACPI_INTR_PIC)
BUS_CONFIG_INTR(dev, AcpiGbl_FADT.SciInterrupt,
INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
else
acpi_SetIntrModel(intr_model);
SYSCTL_ADD_UINT(&acpi_sc->acpi_sysctl_ctx,
SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), OID_AUTO,
"reset_video", CTLFLAG_RW, &acpi_reset_video, 0,
"Call the VESA reset BIOS vector on the resume path");
return (0);
}
void
acpi_SetDefaultIntrModel(int model)
{
intr_model = model;
}
/* Check BIOS date. If 1998 or older, disable ACPI. */
int
acpi_machdep_quirks(int *quirks)
{
char *va;
int year;
/* BIOS address 0xffff5 contains the date in the format mm/dd/yy. */
va = pmap_mapbios(0xffff0, 16);
sscanf(va + 11, "%2d", &year);
pmap_unmapbios((vm_offset_t)va, 16);
/*
* Date must be >= 1/1/1999 or we don't trust ACPI. Note that this
* check must be changed by my 114th birthday.
*/
if (year > 90 && year < 99)
*quirks = ACPI_Q_BROKEN;
return (0);
}
void
acpi_cpu_c1()
{
__asm __volatile("sti; hlt");
}
/*
* ACPI nexus(4) driver.
*/
static int
nexus_acpi_probe(device_t dev)
{
int error;
error = acpi_identify();
if (error)
return (error);
return (BUS_PROBE_DEFAULT);
}
static int
nexus_acpi_attach(device_t dev)
{
nexus_init_resources();
bus_generic_probe(dev);
if (BUS_ADD_CHILD(dev, 10, "acpi", 0) == NULL)
panic("failed to add acpi0 device");
return (bus_generic_attach(dev));
}
static device_method_t nexus_acpi_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, nexus_acpi_probe),
DEVMETHOD(device_attach, nexus_acpi_attach),
{ 0, 0 }
};
DEFINE_CLASS_1(nexus, nexus_acpi_driver, nexus_acpi_methods, 1, nexus_driver);
static devclass_t nexus_devclass;
DRIVER_MODULE(nexus_acpi, root, nexus_acpi_driver, nexus_devclass, 0, 0);
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