caa73ea158
ACPI container devices require special hotplug handling, at least on some systems, since generally user space needs to carry out system-specific cleanup before it makes sense to offline devices in the container. However, the current ACPI hotplug code for containers first attempts to offline devices in the container and only then it notifies user space of the container offline. Moreover, after commit 202317a573b2 (ACPI / scan: Add acpi_device objects for all device nodes in the namespace), ACPI device objects representing containers are present as long as the ACPI namespace nodes corresponding to them are present, which may be forever, even if the container devices are physically detached from the system (the return values of the corresponding _STA methods change in those cases, but generally the namespace nodes themselves are still there). Thus it is useful to introduce entities representing containers that will go away during container hot-unplug. The goal of this change is to address both the above issues. The idea is to create a "companion" container system device for each of the ACPI container device objects during the initial namespace scan or on a hotplug event making the container present. That system device will be unregistered on container removal. A new bus type for container devices is added for this purpose, because device offline and online operations need to be defined for them. The online operation is a trivial function that is always successful and the offline uses a callback pointed to by the container device's offline member. For ACPI containers that callback simply walks the list of ACPI device objects right below the container object (its children) and checks if all of their physical companion devices are offline. If that's not the case, it returns -EBUSY and the container system devivce cannot be put offline. Consequently, to put the container system device offline, it is necessary to put all of the physical devices depending on its ACPI companion object offline beforehand. Container system devices created for ACPI container objects are initially online. They are created by the container ACPI scan handler whose hotplug.demand_offline flag is set. That causes acpi_scan_hot_remove() to check if the companion container system device is offline before attempting to remove an ACPI container or any devices below it. If the check fails, a KOBJ_CHANGE uevent is emitted for the container system device in question and user space is expected to offline all devices below the container and the container itself in response to it. Then, user space can finalize the removal of the container with the help of its ACPI device object's eject attribute in sysfs. Tested-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
176 lines
6.1 KiB
C
176 lines
6.1 KiB
C
/*
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* acpi/internal.h
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* For use by Linux/ACPI infrastructure, not drivers
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*
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* Copyright (c) 2009, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _ACPI_INTERNAL_H_
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#define _ACPI_INTERNAL_H_
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#define PREFIX "ACPI: "
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acpi_status acpi_os_initialize1(void);
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int init_acpi_device_notify(void);
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int acpi_scan_init(void);
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void acpi_pci_root_init(void);
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void acpi_pci_link_init(void);
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void acpi_processor_init(void);
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void acpi_platform_init(void);
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int acpi_sysfs_init(void);
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#ifdef CONFIG_ACPI_CONTAINER
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void acpi_container_init(void);
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#else
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static inline void acpi_container_init(void) {}
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#endif
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#ifdef CONFIG_ACPI_DOCK
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void acpi_dock_init(void);
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#else
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static inline void acpi_dock_init(void) {}
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#endif
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#ifdef CONFIG_ACPI_HOTPLUG_MEMORY
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void acpi_memory_hotplug_init(void);
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#else
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static inline void acpi_memory_hotplug_init(void) {}
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#endif
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#ifdef CONFIG_X86
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void acpi_cmos_rtc_init(void);
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#else
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static inline void acpi_cmos_rtc_init(void) {}
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#endif
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extern bool acpi_force_hot_remove;
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void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
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const char *name);
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int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
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const char *hotplug_profile_name);
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void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val);
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#ifdef CONFIG_DEBUG_FS
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extern struct dentry *acpi_debugfs_dir;
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int acpi_debugfs_init(void);
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#else
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static inline void acpi_debugfs_init(void) { return; }
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#endif
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#ifdef CONFIG_X86_INTEL_LPSS
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void acpi_lpss_init(void);
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#else
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static inline void acpi_lpss_init(void) {}
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#endif
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bool acpi_queue_hotplug_work(struct work_struct *work);
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bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent);
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/* --------------------------------------------------------------------------
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Device Node Initialization / Removal
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-------------------------------------------------------------------------- */
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#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
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ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
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int acpi_device_add(struct acpi_device *device,
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void (*release)(struct device *));
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void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
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int type, unsigned long long sta);
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void acpi_device_add_finalize(struct acpi_device *device);
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void acpi_free_pnp_ids(struct acpi_device_pnp *pnp);
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int acpi_bind_one(struct device *dev, struct acpi_device *adev);
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int acpi_unbind_one(struct device *dev);
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bool acpi_device_is_present(struct acpi_device *adev);
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/* --------------------------------------------------------------------------
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Power Resource
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-------------------------------------------------------------------------- */
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int acpi_power_init(void);
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void acpi_power_resources_list_free(struct list_head *list);
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int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
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struct list_head *list);
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int acpi_add_power_resource(acpi_handle handle);
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void acpi_power_add_remove_device(struct acpi_device *adev, bool add);
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int acpi_power_wakeup_list_init(struct list_head *list, int *system_level);
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int acpi_device_sleep_wake(struct acpi_device *dev,
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int enable, int sleep_state, int dev_state);
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int acpi_power_get_inferred_state(struct acpi_device *device, int *state);
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int acpi_power_on_resources(struct acpi_device *device, int state);
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int acpi_power_transition(struct acpi_device *device, int state);
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int acpi_device_update_power(struct acpi_device *device, int *state_p);
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int acpi_wakeup_device_init(void);
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void acpi_early_processor_set_pdc(void);
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/* --------------------------------------------------------------------------
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Embedded Controller
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-------------------------------------------------------------------------- */
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struct acpi_ec {
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acpi_handle handle;
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unsigned long gpe;
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unsigned long command_addr;
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unsigned long data_addr;
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unsigned long global_lock;
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unsigned long flags;
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struct mutex mutex;
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wait_queue_head_t wait;
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struct list_head list;
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struct transaction *curr;
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spinlock_t lock;
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};
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extern struct acpi_ec *first_ec;
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int acpi_ec_init(void);
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int acpi_ec_ecdt_probe(void);
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int acpi_boot_ec_enable(void);
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void acpi_ec_block_transactions(void);
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void acpi_ec_unblock_transactions(void);
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void acpi_ec_unblock_transactions_early(void);
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/*--------------------------------------------------------------------------
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Suspend/Resume
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-------------------------------------------------------------------------- */
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extern int acpi_sleep_init(void);
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#ifdef CONFIG_ACPI_SLEEP
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int acpi_sleep_proc_init(void);
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int suspend_nvs_alloc(void);
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void suspend_nvs_free(void);
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int suspend_nvs_save(void);
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void suspend_nvs_restore(void);
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#else
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static inline int acpi_sleep_proc_init(void) { return 0; }
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static inline int suspend_nvs_alloc(void) { return 0; }
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static inline void suspend_nvs_free(void) {}
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static inline int suspend_nvs_save(void) { return 0; }
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static inline void suspend_nvs_restore(void) {}
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#endif
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/*--------------------------------------------------------------------------
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Platform bus support
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-------------------------------------------------------------------------- */
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struct platform_device;
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int acpi_create_platform_device(struct acpi_device *adev,
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const struct acpi_device_id *id);
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/*--------------------------------------------------------------------------
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Video
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-------------------------------------------------------------------------- */
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#if defined(CONFIG_ACPI_VIDEO) || defined(CONFIG_ACPI_VIDEO_MODULE)
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bool acpi_osi_is_win8(void);
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#endif
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#endif /* _ACPI_INTERNAL_H_ */
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