Commit edf5bf34 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

ACPI / dock: Use callback pointers from devices' ACPI hotplug contexts 



Instead of requiring a set of special dock operations to be registered
via register_hotplug_dock_device() for each ACPI dock device, it is
much more straightforward to use callback pointers from the devices'
hotplug contexts if available.

For this reason, modify dock_hotplug_event() to use callback pointers
from the hotplug contexts of ACPI devices and fall back to using the
special dock operarions only if those callbacks are missing.  Also
make the ACPI-based PCI hotplug (ACPIPHP) subsystem set the .fixup
callback pointer in the hotplug contexts of devices handled by it to
a new function, acpiphp_post_dock_fixup(), so that the dock station
driver can use the callbacks from those contexts instead of special
dock operations registered via register_hotplug_dock_device().

Along with the above changes drop the ACPIPHP's dock operations that
are not necessary any more.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 3b52b21f

drivers/acpi/dock.c

+29 −0
Original line number Diff line number Diff line
@@ -185,9 +185,38 @@ static void dock_release_hotplug(struct dock_dependent_device *dd) 
static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event,

			       enum dock_callback_type cb_type)

{

	struct acpi_device *adev = dd->adev;

	acpi_notify_handler cb = NULL;

	bool run = false;



	acpi_lock_hp_context();



	if (!adev->hp)

		goto no_context;



	if (cb_type == DOCK_CALL_FIXUP) {

		void (*fixup)(struct acpi_device *);



		fixup = adev->hp->fixup;

		if (fixup) {

			acpi_unlock_hp_context();

			fixup(adev);

			return;

		}

	} else {

		int (*notify)(struct acpi_device *, u32);



		notify = adev->hp->event;

		if (notify) {

			acpi_unlock_hp_context();

			notify(adev, event);

			return;

		}

	}



 no_context:

	acpi_unlock_hp_context();



	mutex_lock(&hotplug_lock);



	if (dd->hp_context) {

drivers/pci/hotplug/acpiphp_glue.c

+49 −70
Original line number Diff line number Diff line
@@ -60,6 +60,7 @@ static LIST_HEAD(bridge_list); 
static DEFINE_MUTEX(bridge_mutex);



static int acpiphp_hotplug_event(struct acpi_device *adev, u32 type);

static void acpiphp_post_dock_fixup(struct acpi_device *adev);

static void acpiphp_sanitize_bus(struct pci_bus *bus);

static void acpiphp_set_hpp_values(struct pci_bus *bus);

static void hotplug_event(u32 type, struct acpiphp_context *context);
@@ -80,7 +81,8 @@ static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev) 
		return NULL;



	context->refcount = 1;

	acpi_set_hp_context(adev, &context->hp, acpiphp_hotplug_event, NULL);

	acpi_set_hp_context(adev, &context->hp, acpiphp_hotplug_event,

			    acpiphp_post_dock_fixup);

	return context;

}
@@ -130,6 +132,27 @@ static inline void put_bridge(struct acpiphp_bridge *bridge) 
	kref_put(&bridge->ref, free_bridge);

}



static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev)

{

	struct acpiphp_context *context;



	acpi_lock_hp_context();

	context = acpiphp_get_context(adev);

	if (!context || context->func.parent->is_going_away) {

		acpi_unlock_hp_context();

		return NULL;

	}

	get_bridge(context->func.parent);

	acpiphp_put_context(context);

	acpi_unlock_hp_context();

	return context;

}



static void acpiphp_let_context_go(struct acpiphp_context *context)

{

	put_bridge(context->func.parent);

}



static void free_bridge(struct kref *kref)

{

	struct acpiphp_context *context;
@@ -164,28 +187,29 @@ static void free_bridge(struct kref *kref) 
	acpi_unlock_hp_context();

}



/*

 * the _DCK method can do funny things... and sometimes not

 * hah-hah funny.

/**

 * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices.

 * @adev: ACPI device object corresponding to a PCI device.

 *

 * TBD - figure out a way to only call fixups for

 * systems that require them.

 * TBD - figure out a way to only call fixups for systems that require them.

 */

static void post_dock_fixups(acpi_handle not_used, u32 event, void *data)

static void acpiphp_post_dock_fixup(struct acpi_device *adev)

{

	struct acpiphp_context *context = data;

	struct pci_bus *bus = context->func.slot->bus;

	struct acpiphp_context *context = acpiphp_grab_context(adev);

	struct pci_bus *bus;

	u32 buses;



	if (!bus->self)

	if (!context)

		return;



	bus = context->func.slot->bus;

	if (!bus->self)

		goto out;



	/* fixup bad _DCK function that rewrites

	 * secondary bridge on slot

	 */

	pci_read_config_dword(bus->self,

			PCI_PRIMARY_BUS,

			&buses);

	pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses);



	if (((buses >> 8) & 0xff) != bus->busn_res.start) {

		buses = (buses & 0xff000000)
@@ -194,24 +218,11 @@ static void post_dock_fixups(acpi_handle not_used, u32 event, void *data) 
			| ((unsigned int)(bus->busn_res.end) << 16);

		pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);

	}

}



static void dock_event(acpi_handle handle, u32 type, void *data)

{

	struct acpi_device *adev;



	adev = acpi_bus_get_acpi_device(handle);

	if (adev) {

		acpiphp_hotplug_event(adev, type);

		acpi_bus_put_acpi_device(adev);

	}

 out:

	acpiphp_let_context_go(context);

}



static const struct acpi_dock_ops acpiphp_dock_ops = {

	.fixup = post_dock_fixups,

	.handler = dock_event,

};



/* Check whether the PCI device is managed by native PCIe hotplug driver */

static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)

{
@@ -241,20 +252,6 @@ static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) 
	return true;

}



static void acpiphp_dock_init(void *data)

{

	struct acpiphp_context *context = data;



	get_bridge(context->func.parent);

}



static void acpiphp_dock_release(void *data)

{

	struct acpiphp_context *context = data;



	put_bridge(context->func.parent);

}



/**

 * acpiphp_add_context - Add ACPIPHP context to an ACPI device object.

 * @handle: ACPI handle of the object to add a context to.
@@ -300,15 +297,18 @@ static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data, 
	newfunc = &context->func;

	newfunc->function = function;

	newfunc->parent = bridge;

	acpi_unlock_hp_context();



	if (acpi_has_method(handle, "_EJ0"))

	/*

	 * If this is a dock device, its _EJ0 should be executed by the dock

	 * notify handler after calling _DCK.

	 */

	if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0"))

		newfunc->flags = FUNC_HAS_EJ0;



	if (acpi_has_method(handle, "_STA"))

		newfunc->flags |= FUNC_HAS_STA;



	acpi_unlock_hp_context();



	/* search for objects that share the same slot */

	list_for_each_entry(slot, &bridge->slots, node)

		if (slot->device == device)
@@ -369,18 +369,6 @@ static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data, 
				       &val, 60*1000))

		slot->flags |= SLOT_ENABLED;



	if (is_dock_device(adev)) {

		/* we don't want to call this device's _EJ0

		 * because we want the dock notify handler

		 * to call it after it calls _DCK

		 */

		newfunc->flags &= ~FUNC_HAS_EJ0;

		if (register_hotplug_dock_device(handle,

			&acpiphp_dock_ops, context,

			acpiphp_dock_init, acpiphp_dock_release))

			pr_debug("failed to register dock device\n");

	}



	return AE_OK;

}
@@ -411,11 +399,9 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge) 
		list_for_each_entry(func, &slot->funcs, sibling) {

			struct acpi_device *adev = func_to_acpi_device(func);



			if (is_dock_device(adev))

				unregister_hotplug_dock_device(adev->handle);



			acpi_lock_hp_context();

			adev->hp->event = NULL;

			adev->hp->fixup = NULL;

			acpi_unlock_hp_context();

		}

		slot->flags |= SLOT_IS_GOING_AWAY;
@@ -851,19 +837,12 @@ static int acpiphp_hotplug_event(struct acpi_device *adev, u32 type) 
{

	struct acpiphp_context *context;



	acpi_lock_hp_context();

	context = acpiphp_get_context(adev);

	if (!context || context->func.parent->is_going_away) {

		acpi_unlock_hp_context();

	context = acpiphp_grab_context(adev);

	if (!context)

		return -ENODATA;

	}

	get_bridge(context->func.parent);

	acpiphp_put_context(context);

	acpi_unlock_hp_context();



	hotplug_event(type, context);



	put_bridge(context->func.parent);

	acpiphp_let_context_go(context);

	return 0;

}

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