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[libata] ACPI: Properly handle bay devices in dock stations 

* Differentiate between bay devices in dock stations and others:

 - When an ACPI_NOTIFY_EJECT_REQUEST appears, just signal uevent to
   userspace (that is when the optional eject button on a bay device is
   pressed/pulled) giving the possibility to unmount file systems and to
   clean up. Also, only send uevent in case we get an EJECT_REQUEST
   without doing anything else. In other cases, you'll get an add/remove
   event because libata attaches/detaches the device.

 - In case of a dock event, which in turn signals an
   ACPI_NOTIFY_EJECT_REQUEST, immediately detach the device, because it
   may already have been gone

* In case of an ACPI_NOTIFY_DEVICE/BUS_CHECK, evaluate _STA to check if
  the device has been plugged or unplugged. If plugged, hotplug it, if
  unplugged, just signal event to userspace
  (initial patch by Matthew Garrett <mjg59@srcf.ucam.org>)

* Call ACPI _EJ0 for detached devices

Signed-off-by: Holger Macht <hmacht@suse.de>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Holger Macht 2008-06-03 20:27:59 +02:00 committed by Jeff Garzik
parent c3b25b32e8
commit 664d080c41
1 changed files with 113 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

163
drivers/ata/libata-acpi.c
View File

@ -118,12 +118,62 @@ static void ata_acpi_associate_ide_port(struct ata_port *ap)
ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
}
static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device
*dev, u32 event)
static void ata_acpi_eject_device(acpi_handle handle)
{
struct acpi_object_list arg_list;
union acpi_object arg;
arg_list.count = 1;
arg_list.pointer = &arg;
arg.type = ACPI_TYPE_INTEGER;
arg.integer.value = 1;
if (ACPI_FAILURE(acpi_evaluate_object(handle, "_EJ0",
&arg_list, NULL)))
printk(KERN_ERR "Failed to evaluate _EJ0!\n");
}
/* @ap and @dev are the same as ata_acpi_handle_hotplug() */
static void ata_acpi_detach_device(struct ata_port *ap, struct ata_device *dev)
{
if (dev)
dev->flags |= ATA_DFLAG_DETACH;
else {
struct ata_link *tlink;
struct ata_device *tdev;
ata_port_for_each_link(tlink, ap)
ata_link_for_each_dev(tdev, tlink)
tdev->flags |= ATA_DFLAG_DETACH;
}
ata_port_schedule_eh(ap);
}
/**
* ata_acpi_handle_hotplug - ACPI event handler backend
* @ap: ATA port ACPI event occurred
* @dev: ATA device ACPI event occurred (can be NULL)
* @event: ACPI event which occurred
* @is_dock_event: boolean indicating whether the event was a dock one
*
* All ACPI bay / device realted events end up in this function. If
* the event is port-wide @dev is NULL. If the event is specific to a
* device, @dev points to it.
*
* Hotplug (as opposed to unplug) notification is always handled as
* port-wide while unplug only kills the target device on device-wide
* event.
*
* LOCKING:
* ACPI notify handler context. May sleep.
*/
static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
u32 event, int is_dock_event)
{
char event_string[12];
char *envp[] = { event_string, NULL };
struct ata_eh_info *ehi;
struct ata_eh_info *ehi = &ap->link.eh_info;
struct kobject *kobj = NULL;
int wait = 0;
unsigned long flags;
@ -131,87 +181,100 @@ static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device
unsigned long sta;
acpi_status status;
if (!ap)
ap = dev->link->ap;
ehi = &ap->link.eh_info;
spin_lock_irqsave(ap->lock, flags);
if (dev)
if (dev) {
if (dev->sdev)
kobj = &dev->sdev->sdev_gendev.kobj;
handle = dev->acpi_handle;
else
} else {
kobj = &ap->dev->kobj;
handle = ap->acpi_handle;
}
status = acpi_get_handle(handle, "_EJ0", &tmphandle);
if (ACPI_FAILURE(status)) {
/* This device is not ejectable */
spin_unlock_irqrestore(ap->lock, flags);
if (ACPI_FAILURE(status))
/* This device does not support hotplug */
return;
}
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_FAILURE(status)) {
printk ("Unable to determine bay status\n");
spin_unlock_irqrestore(ap->lock, flags);
return;
}
spin_lock_irqsave(ap->lock, flags);
switch (event) {
case ACPI_NOTIFY_BUS_CHECK:
case ACPI_NOTIFY_DEVICE_CHECK:
ata_ehi_push_desc(ehi, "ACPI event");
if (!sta) {
/* Device has been unplugged */
if (dev)
dev->flags |= ATA_DFLAG_DETACH;
else {
struct ata_link *tlink;
struct ata_device *tdev;
ata_port_for_each_link(tlink, ap) {
ata_link_for_each_dev(tdev, tlink) {
tdev->flags |=
ATA_DFLAG_DETACH;
}
}
}
ata_port_schedule_eh(ap);
wait = 1;
} else {
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_FAILURE(status)) {
ata_port_printk(ap, KERN_ERR,
"acpi: failed to determine bay status (0x%x)\n",
status);
break;
}
if (sta) {
ata_ehi_hotplugged(ehi);
ata_port_freeze(ap);
} else {
/* The device has gone - unplug it */
ata_acpi_detach_device(ap, dev);
wait = 1;
}
break;
case ACPI_NOTIFY_EJECT_REQUEST:
ata_ehi_push_desc(ehi, "ACPI event");
if (!is_dock_event)
break;
/* undock event - immediate unplug */
ata_acpi_detach_device(ap, dev);
wait = 1;
break;
}
/* make sure kobj doesn't go away while ap->lock is released */
kobject_get(kobj);
spin_unlock_irqrestore(ap->lock, flags);
if (wait)
if (wait) {
ata_port_wait_eh(ap);
ata_acpi_eject_device(handle);
}
if (dev) {
if (dev->sdev)
kobj = &dev->sdev->sdev_gendev.kobj;
} else
kobj = &ap->dev->kobj;
if (kobj) {
if (kobj && !is_dock_event) {
sprintf(event_string, "BAY_EVENT=%d", event);
kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
}
kobject_put(kobj);
}
static void ata_acpi_dev_notify_dock(acpi_handle handle, u32 event, void *data)
{
struct ata_device *dev = data;
ata_acpi_handle_hotplug(dev->link->ap, dev, event, 1);
}
static void ata_acpi_ap_notify_dock(acpi_handle handle, u32 event, void *data)
{
struct ata_port *ap = data;
ata_acpi_handle_hotplug(ap, NULL, event, 1);
}
static void ata_acpi_dev_notify(acpi_handle handle, u32 event, void *data)
{
struct ata_device *dev = data;
ata_acpi_handle_hotplug(NULL, dev, event);
ata_acpi_handle_hotplug(dev->link->ap, dev, event, 0);
}
static void ata_acpi_ap_notify(acpi_handle handle, u32 event, void *data)
{
struct ata_port *ap = data;
ata_acpi_handle_hotplug(ap, NULL, event);
ata_acpi_handle_hotplug(ap, NULL, event, 0);
}
/**
@ -252,7 +315,7 @@ void ata_acpi_associate(struct ata_host *host)
ata_acpi_ap_notify, ap);
/* we might be on a docking station */
register_hotplug_dock_device(ap->acpi_handle,
ata_acpi_ap_notify, ap);
ata_acpi_ap_notify_dock, ap);
}
for (j = 0; j < ata_link_max_devices(&ap->link); j++) {
@ -264,7 +327,7 @@ void ata_acpi_associate(struct ata_host *host)
ata_acpi_dev_notify, dev);
/* we might be on a docking station */
register_hotplug_dock_device(dev->acpi_handle,
ata_acpi_dev_notify, dev);
ata_acpi_dev_notify_dock, dev);
}
}
}