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Late power management and ACPI fixes for 3.10

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- Fix for an ACPI dock regression introduced by the recent rework of
   the ACPI-based PCI hotplug code (acpiphp) that caused it to be
   initialized before the ACPI dock driver from Jiang Liu.
 
 - Fix for PCI resources allocation in the ACPI-based PCI hotplug code
   (acpiphp) that makes it use the same PCI resources assignment rules
   during runtime hotplug that are used during boot from Jiang Liu.
 
 - Fix for ordering and synchronization issues during hot-removal of
   PCI devices on docking stations from Rafael J Wysocki.
 
 - Fix for a regression that removed the code to register a hotplug
   notificaion handler for for ATA ports/devices inadvertently from
   Aaron Lu.
 
 - Fix for a recent cpufreq regression causing a NULL pointer
   dereference to trigger in od_set_powersave_bias() in some
   situations from Jacob Shin.
 
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Merge tag 'pm+acpi-3.10-late' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull late power management and ACPI fixes from Rafael Wysocki:
 "Sorry about the timing of this, but ACPI-based docking stations with
  PCI devices on them and ATA bays would be hardly usable with 3.10
  without it.  We've been working on these fixes for the last couple of
  weeks and everyone involved appears to be reasonably comfortable with
  them now.

  The PM part is one fix for a cpufreq regression introduced recently

   - Fix for an ACPI dock regression introduced by the recent rework of
     the ACPI-based PCI hotplug code (acpiphp) that caused it to be
     initialized before the ACPI dock driver, which is incorrect (ACPI
     dock has to be initialized before acpiphp so that acpiphp can
     register PCI devices on docking stations with it for PCI hotplug on
     re-dock to work).  From Jiang Liu.

   - Fix for PCI resources allocation in the ACPI-based PCI hotplug code
     (acpiphp) that makes it use the same PCI resources assignment rules
     during runtime hotplug that are used during boot (the BIOS' choices
     are now respected in both cases).  This prevents PCI resource
     allocation failures during hotplug from happening in some cases.
     From Jiang Liu.

   - Fix for ordering and synchronization issues during hot-removal of
     PCI devices on docking stations.  It makes the ACPI dock code carry
     out the PCI devices removal synchronously during undock instead of
     spawning a separate asynchronous work item to remove each of them
     without even bothering to wait for all those work items to
     complete.  The hot-addition part is changed analogously.

   - Fix for a regression (introduced a few releases ago) that removed
     the code to register a hotplug notificaion handler for for ATA
     ports/devices inadvertently which prevented ATA bays hotplug from
     working.  The missing code is added back with some improvements.
     From Aaron Lu.

   - Fix for a recent cpufreq regression causing a NULL pointer
     dereference to trigger in od_set_powersave_bias() in some
     situations from Jacob Shin"

* tag 'pm+acpi-3.10-late' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: fix NULL pointer deference at od_set_powersave_bias()
  libata-acpi: add back ACPI based hotplug functionality
  ACPI / dock / PCI: Synchronous handling of dock events for PCI devices
  PCI / ACPI: Use boot-time resource allocation rules during hotplug
  ACPI / dock: Initialize ACPI dock subsystem upfront
This commit is contained in:
Linus Torvalds 2013-06-26 08:55:03 -10:00
commit 687058aed4
11 changed files with 207 additions and 110 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

179
drivers/acpi/dock.c
View File

@ -66,20 +66,21 @@ struct dock_station {
spinlock_t dd_lock;
struct mutex hp_lock;
struct list_head dependent_devices;
struct list_head hotplug_devices;
struct list_head sibling;
struct platform_device *dock_device;
};
static LIST_HEAD(dock_stations);
static int dock_station_count;
static DEFINE_MUTEX(hotplug_lock);
struct dock_dependent_device {
struct list_head list;
struct list_head hotplug_list;
acpi_handle handle;
const struct acpi_dock_ops *ops;
void *context;
const struct acpi_dock_ops *hp_ops;
void *hp_context;
unsigned int hp_refcount;
void (*hp_release)(void *);
};
#define DOCK_DOCKING 0x00000001
@ -111,7 +112,6 @@ add_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
dd->handle = handle;
INIT_LIST_HEAD(&dd->list);
INIT_LIST_HEAD(&dd->hotplug_list);
spin_lock(&ds->dd_lock);
list_add_tail(&dd->list, &ds->dependent_devices);
@ -121,35 +121,90 @@ add_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
}
/**
* dock_add_hotplug_device - associate a hotplug handler with the dock station
* @ds: The dock station
* @dd: The dependent device struct
*
* Add the dependent device to the dock's hotplug device list
* dock_init_hotplug - Initialize a hotplug device on a docking station.
* @dd: Dock-dependent device.
* @ops: Dock operations to attach to the dependent device.
* @context: Data to pass to the @ops callbacks and @release.
* @init: Optional initialization routine to run after setting up context.
* @release: Optional release routine to run on removal.
*/
static void
dock_add_hotplug_device(struct dock_station *ds,
struct dock_dependent_device *dd)
static int dock_init_hotplug(struct dock_dependent_device *dd,
const struct acpi_dock_ops *ops, void *context,
void (*init)(void *), void (*release)(void *))
{
mutex_lock(&ds->hp_lock);
list_add_tail(&dd->hotplug_list, &ds->hotplug_devices);
mutex_unlock(&ds->hp_lock);
int ret = 0;
mutex_lock(&hotplug_lock);
if (dd->hp_context) {
ret = -EEXIST;
} else {
dd->hp_refcount = 1;
dd->hp_ops = ops;
dd->hp_context = context;
dd->hp_release = release;
}
if (!WARN_ON(ret) && init)
init(context);
mutex_unlock(&hotplug_lock);
return ret;
}
/**
* dock_del_hotplug_device - remove a hotplug handler from the dock station
* @ds: The dock station
* @dd: the dependent device struct
* dock_release_hotplug - Decrement hotplug reference counter of dock device.
* @dd: Dock-dependent device.
*
* Delete the dependent device from the dock's hotplug device list
* Decrement the reference counter of @dd and if 0, detach its hotplug
* operations from it, reset its context pointer and run the optional release
* routine if present.
*/
static void
dock_del_hotplug_device(struct dock_station *ds,
struct dock_dependent_device *dd)
static void dock_release_hotplug(struct dock_dependent_device *dd)
{
mutex_lock(&ds->hp_lock);
list_del(&dd->hotplug_list);
mutex_unlock(&ds->hp_lock);
void (*release)(void *) = NULL;
void *context = NULL;
mutex_lock(&hotplug_lock);
if (dd->hp_context && !--dd->hp_refcount) {
dd->hp_ops = NULL;
context = dd->hp_context;
dd->hp_context = NULL;
release = dd->hp_release;
dd->hp_release = NULL;
}
if (release && context)
release(context);
mutex_unlock(&hotplug_lock);
}
static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event,
bool uevent)
{
acpi_notify_handler cb = NULL;
bool run = false;
mutex_lock(&hotplug_lock);
if (dd->hp_context) {
run = true;
dd->hp_refcount++;
if (dd->hp_ops)
cb = uevent ? dd->hp_ops->uevent : dd->hp_ops->handler;
}
mutex_unlock(&hotplug_lock);
if (!run)
return;
if (cb)
cb(dd->handle, event, dd->hp_context);
dock_release_hotplug(dd);
}
/**
@ -360,9 +415,8 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event)
/*
* First call driver specific hotplug functions
*/
list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list)
if (dd->ops && dd->ops->handler)
dd->ops->handler(dd->handle, event, dd->context);
list_for_each_entry(dd, &ds->dependent_devices, list)
dock_hotplug_event(dd, event, false);
/*
* Now make sure that an acpi_device is created for each
@ -398,9 +452,8 @@ static void dock_event(struct dock_station *ds, u32 event, int num)
if (num == DOCK_EVENT)
kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list)
if (dd->ops && dd->ops->uevent)
dd->ops->uevent(dd->handle, event, dd->context);
list_for_each_entry(dd, &ds->dependent_devices, list)
dock_hotplug_event(dd, event, true);
if (num != DOCK_EVENT)
kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
@ -570,19 +623,24 @@ EXPORT_SYMBOL_GPL(unregister_dock_notifier);
* @handle: the handle of the device
* @ops: handlers to call after docking
* @context: device specific data
* @init: Optional initialization routine to run after registration
* @release: Optional release routine to run on unregistration
*
* If a driver would like to perform a hotplug operation after a dock
* event, they can register an acpi_notifiy_handler to be called by
* the dock driver after _DCK is executed.
*/
int
register_hotplug_dock_device(acpi_handle handle, const struct acpi_dock_ops *ops,
void *context)
int register_hotplug_dock_device(acpi_handle handle,
const struct acpi_dock_ops *ops, void *context,
void (*init)(void *), void (*release)(void *))
{
struct dock_dependent_device *dd;
struct dock_station *dock_station;
int ret = -EINVAL;
if (WARN_ON(!context))
return -EINVAL;
if (!dock_station_count)
return -ENODEV;
@ -597,12 +655,8 @@ register_hotplug_dock_device(acpi_handle handle, const struct acpi_dock_ops *ops
* ops
*/
dd = find_dock_dependent_device(dock_station, handle);
if (dd) {
dd->ops = ops;
dd->context = context;
dock_add_hotplug_device(dock_station, dd);
if (dd && !dock_init_hotplug(dd, ops, context, init, release))
ret = 0;
}
}
return ret;
@ -624,7 +678,7 @@ void unregister_hotplug_dock_device(acpi_handle handle)
list_for_each_entry(dock_station, &dock_stations, sibling) {
dd = find_dock_dependent_device(dock_station, handle);
if (dd)
dock_del_hotplug_device(dock_station, dd);
dock_release_hotplug(dd);
}
}
EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device);
@ -953,7 +1007,6 @@ static int __init dock_add(acpi_handle handle)
mutex_init(&dock_station->hp_lock);
spin_lock_init(&dock_station->dd_lock);
INIT_LIST_HEAD(&dock_station->sibling);
INIT_LIST_HEAD(&dock_station->hotplug_devices);
ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
INIT_LIST_HEAD(&dock_station->dependent_devices);
@ -993,30 +1046,6 @@ err_unregister:
return ret;
}
/**
* dock_remove - free up resources related to the dock station
*/
static int dock_remove(struct dock_station *ds)
{
struct dock_dependent_device *dd, *tmp;
struct platform_device *dock_device = ds->dock_device;
if (!dock_station_count)
return 0;
/* remove dependent devices */
list_for_each_entry_safe(dd, tmp, &ds->dependent_devices, list)
kfree(dd);
list_del(&ds->sibling);
/* cleanup sysfs */
sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group);
platform_device_unregister(dock_device);
return 0;
}
/**
* find_dock_and_bay - look for dock stations and bays
* @handle: acpi handle of a device
@ -1035,7 +1064,7 @@ find_dock_and_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
return AE_OK;
}
static int __init dock_init(void)
int __init acpi_dock_init(void)
{
if (acpi_disabled)
return 0;
@ -1054,19 +1083,3 @@ static int __init dock_init(void)
ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count);
return 0;
}
static void __exit dock_exit(void)
{
struct dock_station *tmp, *dock_station;
unregister_acpi_bus_notifier(&dock_acpi_notifier);
list_for_each_entry_safe(dock_station, tmp, &dock_stations, sibling)
dock_remove(dock_station);
}
/*
* Must be called before drivers of devices in dock, otherwise we can't know
* which devices are in a dock
*/
subsys_initcall(dock_init);
module_exit(dock_exit);

5
drivers/acpi/internal.h
View File

@ -40,6 +40,11 @@ void acpi_container_init(void);
#else
static inline void acpi_container_init(void) {}
#endif
#ifdef CONFIG_ACPI_DOCK
void acpi_dock_init(void);
#else
static inline void acpi_dock_init(void) {}
#endif
#ifdef CONFIG_ACPI_HOTPLUG_MEMORY
void acpi_memory_hotplug_init(void);
#else

1
drivers/acpi/scan.c
View File

@ -2042,6 +2042,7 @@ int __init acpi_scan_init(void)
acpi_lpss_init();
acpi_container_init();
acpi_memory_hotplug_init();
acpi_dock_init();
mutex_lock(&acpi_scan_lock);
/*

37
drivers/ata/libata-acpi.c
View File

@ -156,8 +156,10 @@ static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
spin_unlock_irqrestore(ap->lock, flags);
if (wait)
if (wait) {
ata_port_wait_eh(ap);
flush_work(&ap->hotplug_task.work);
}
}
static void ata_acpi_dev_notify_dock(acpi_handle handle, u32 event, void *data)
@ -214,6 +216,39 @@ static const struct acpi_dock_ops ata_acpi_ap_dock_ops = {
.uevent = ata_acpi_ap_uevent,
};
void ata_acpi_hotplug_init(struct ata_host *host)
{
int i;
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
acpi_handle handle;
struct ata_device *dev;
if (!ap)
continue;
handle = ata_ap_acpi_handle(ap);
if (handle) {
/* we might be on a docking station */
register_hotplug_dock_device(handle,
&ata_acpi_ap_dock_ops, ap,
NULL, NULL);
}
ata_for_each_dev(dev, &ap->link, ALL) {
handle = ata_dev_acpi_handle(dev);
if (!handle)
continue;
/* we might be on a docking station */
register_hotplug_dock_device(handle,
&ata_acpi_dev_dock_ops,
dev, NULL, NULL);
}
}
}
/**
* ata_acpi_dissociate - dissociate ATA host from ACPI objects
* @host: target ATA host

2
drivers/ata/libata-core.c
View File

@ -6148,6 +6148,8 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
if (rc)
goto err_tadd;
ata_acpi_hotplug_init(host);
/* set cable, sata_spd_limit and report */
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];

2
drivers/ata/libata.h
View File

@ -122,6 +122,7 @@ extern int ata_acpi_register(void);
extern void ata_acpi_unregister(void);
extern void ata_acpi_bind(struct ata_device *dev);
extern void ata_acpi_unbind(struct ata_device *dev);
extern void ata_acpi_hotplug_init(struct ata_host *host);
#else
static inline void ata_acpi_dissociate(struct ata_host *host) { }
static inline int ata_acpi_on_suspend(struct ata_port *ap) { return 0; }
@ -134,6 +135,7 @@ static inline int ata_acpi_register(void) { return 0; }
static inline void ata_acpi_unregister(void) { }
static inline void ata_acpi_bind(struct ata_device *dev) { }
static inline void ata_acpi_unbind(struct ata_device *dev) { }
static inline void ata_acpi_hotplug_init(struct ata_host *host) {}
#endif
/* libata-scsi.c */

17
drivers/cpufreq/cpufreq_ondemand.c
View File

@ -47,6 +47,8 @@ static struct od_ops od_ops;
static struct cpufreq_governor cpufreq_gov_ondemand;
#endif
static unsigned int default_powersave_bias;
static void ondemand_powersave_bias_init_cpu(int cpu)
{
struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
@ -543,7 +545,7 @@ static int od_init(struct dbs_data *dbs_data)
tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
tuners->ignore_nice = 0;
tuners->powersave_bias = 0;
tuners->powersave_bias = default_powersave_bias;
tuners->io_is_busy = should_io_be_busy();
dbs_data->tuners = tuners;
@ -585,6 +587,7 @@ static void od_set_powersave_bias(unsigned int powersave_bias)
unsigned int cpu;
cpumask_t done;
default_powersave_bias = powersave_bias;
cpumask_clear(&done);
get_online_cpus();
@ -593,11 +596,17 @@ static void od_set_powersave_bias(unsigned int powersave_bias)
continue;
policy = per_cpu(od_cpu_dbs_info, cpu).cdbs.cur_policy;
dbs_data = policy->governor_data;
od_tuners = dbs_data->tuners;
od_tuners->powersave_bias = powersave_bias;
if (!policy)
continue;
cpumask_or(&done, &done, policy->cpus);
if (policy->governor != &cpufreq_gov_ondemand)
continue;
dbs_data = policy->governor_data;
od_tuners = dbs_data->tuners;
od_tuners->powersave_bias = default_powersave_bias;
}
put_online_cpus();
}

53
drivers/pci/hotplug/acpiphp_glue.c
View File

@ -61,6 +61,7 @@ static DEFINE_MUTEX(bridge_mutex);
static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
static void acpiphp_sanitize_bus(struct pci_bus *bus);
static void acpiphp_set_hpp_values(struct pci_bus *bus);
static void hotplug_event_func(acpi_handle handle, u32 type, void *context);
static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
static void free_bridge(struct kref *kref);
@ -147,7 +148,7 @@ static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
static const struct acpi_dock_ops acpiphp_dock_ops = {
.handler = handle_hotplug_event_func,
.handler = hotplug_event_func,
};
/* Check whether the PCI device is managed by native PCIe hotplug driver */
@ -179,6 +180,20 @@ static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
return true;
}
static void acpiphp_dock_init(void *data)
{
struct acpiphp_func *func = data;
get_bridge(func->slot->bridge);
}
static void acpiphp_dock_release(void *data)
{
struct acpiphp_func *func = data;
put_bridge(func->slot->bridge);
}
/* callback routine to register each ACPI PCI slot object */
static acpi_status
register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
@ -298,7 +313,8 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
*/
newfunc->flags &= ~FUNC_HAS_EJ0;
if (register_hotplug_dock_device(handle,
&acpiphp_dock_ops, newfunc))
&acpiphp_dock_ops, newfunc,
acpiphp_dock_init, acpiphp_dock_release))
dbg("failed to register dock device\n");
/* we need to be notified when dock events happen
@ -670,6 +686,7 @@ static int __ref enable_device(struct acpiphp_slot *slot)
struct pci_bus *bus = slot->bridge->pci_bus;
struct acpiphp_func *func;
int num, max, pass;
LIST_HEAD(add_list);
if (slot->flags & SLOT_ENABLED)
goto err_exit;
@ -694,13 +711,15 @@ static int __ref enable_device(struct acpiphp_slot *slot)
max = pci_scan_bridge(bus, dev, max, pass);
if (pass && dev->subordinate) {
check_hotplug_bridge(slot, dev);
pci_bus_size_bridges(dev->subordinate);
pcibios_resource_survey_bus(dev->subordinate);
__pci_bus_size_bridges(dev->subordinate,
&add_list);
}
}
}
}
pci_bus_assign_resources(bus);
__pci_bus_assign_resources(bus, &add_list, NULL);
acpiphp_sanitize_bus(bus);
acpiphp_set_hpp_values(bus);
acpiphp_set_acpi_region(slot);
@ -1065,22 +1084,12 @@ static void handle_hotplug_event_bridge(acpi_handle handle, u32 type,
alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_bridge);
}
static void _handle_hotplug_event_func(struct work_struct *work)
static void hotplug_event_func(acpi_handle handle, u32 type, void *context)
{
struct acpiphp_func *func;
struct acpiphp_func *func = context;
char objname[64];
struct acpi_buffer buffer = { .length = sizeof(objname),
.pointer = objname };
struct acpi_hp_work *hp_work;
acpi_handle handle;
u32 type;
hp_work = container_of(work, struct acpi_hp_work, work);
handle = hp_work->handle;
type = hp_work->type;
func = (struct acpiphp_func *)hp_work->context;
acpi_scan_lock_acquire();
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
@ -1113,6 +1122,18 @@ static void _handle_hotplug_event_func(struct work_struct *work)
warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
break;
}
}
static void _handle_hotplug_event_func(struct work_struct *work)
{
struct acpi_hp_work *hp_work;
struct acpiphp_func *func;
hp_work = container_of(work, struct acpi_hp_work, work);
func = hp_work->context;
acpi_scan_lock_acquire();
hotplug_event_func(hp_work->handle, hp_work->type, func);
acpi_scan_lock_release();
kfree(hp_work); /* allocated in handle_hotplug_event_func */

5
drivers/pci/pci.h
View File

@ -202,6 +202,11 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
struct resource *res, unsigned int reg);
int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type);
void pci_configure_ari(struct pci_dev *dev);
void __ref __pci_bus_size_bridges(struct pci_bus *bus,
struct list_head *realloc_head);
void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
struct list_head *realloc_head,
struct list_head *fail_head);
/**
* pci_ari_enabled - query ARI forwarding status

8
drivers/pci/setup-bus.c
View File

@ -1044,7 +1044,7 @@ handle_done:
;
}
static void __ref __pci_bus_size_bridges(struct pci_bus *bus,
void __ref __pci_bus_size_bridges(struct pci_bus *bus,
struct list_head *realloc_head)
{
struct pci_dev *dev;
@ -1115,9 +1115,9 @@ void __ref pci_bus_size_bridges(struct pci_bus *bus)
}
EXPORT_SYMBOL(pci_bus_size_bridges);
static void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
struct list_head *realloc_head,
struct list_head *fail_head)
void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
struct list_head *realloc_head,
struct list_head *fail_head)
{
struct pci_bus *b;
struct pci_dev *dev;

8
include/acpi/acpi_drivers.h
View File

@ -123,7 +123,9 @@ extern int register_dock_notifier(struct notifier_block *nb);
extern void unregister_dock_notifier(struct notifier_block *nb);
extern int register_hotplug_dock_device(acpi_handle handle,
const struct acpi_dock_ops *ops,
void *context);
void *context,
void (*init)(void *),
void (*release)(void *));
extern void unregister_hotplug_dock_device(acpi_handle handle);
#else
static inline int is_dock_device(acpi_handle handle)
@ -139,7 +141,9 @@ static inline void unregister_dock_notifier(struct notifier_block *nb)
}
static inline int register_hotplug_dock_device(acpi_handle handle,
const struct acpi_dock_ops *ops,
void *context)
void *context,
void (*init)(void *),
void (*release)(void *))
{
return -ENODEV;
}