acpiphp_glue.c

audio driver for hotplug pci on linux 2.6.27

}

static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
{
	struct list_head *head;
	list_for_each(head, &bridge_list) {
		struct acpiphp_bridge *bridge = list_entry(head,
						struct acpiphp_bridge, list);
		if (bridge->handle == handle)
			return bridge;
	}

	return NULL;
}

static void cleanup_bridge(struct acpiphp_bridge *bridge)
{
	struct list_head *list, *tmp;
	struct acpiphp_slot *slot;
	acpi_status status;
	acpi_handle handle = bridge->handle;

	status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
					    handle_hotplug_event_bridge);
	if (ACPI_FAILURE(status))
		err("failed to remove notify handler\n");

	if ((bridge->type != BRIDGE_TYPE_HOST) &&
	    ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
		status = acpi_install_notify_handler(bridge->func->handle,
						ACPI_SYSTEM_NOTIFY,
						handle_hotplug_event_func,
						bridge->func);
		if (ACPI_FAILURE(status))
			err("failed to install interrupt notify handler\n");
	}

	slot = bridge->slots;
	while (slot) {
		struct acpiphp_slot *next = slot->next;
		list_for_each_safe (list, tmp, &slot->funcs) {
			struct acpiphp_func *func;
			func = list_entry(list, struct acpiphp_func, sibling);
			if (is_dock_device(func->handle)) {
				unregister_hotplug_dock_device(func->handle);
				unregister_dock_notifier(&func->nb);
			}
			if (!(func->flags & FUNC_HAS_DCK)) {
				status = acpi_remove_notify_handler(func->handle,
						ACPI_SYSTEM_NOTIFY,
						handle_hotplug_event_func);
				if (ACPI_FAILURE(status))
					err("failed to remove notify handler\n");
			}
			pci_dev_put(func->pci_dev);
			list_del(list);
			kfree(func);
		}
		acpiphp_unregister_hotplug_slot(slot);
		list_del(&slot->funcs);
		kfree(slot);
		slot = next;
	}

	pci_dev_put(bridge->pci_dev);
	list_del(&bridge->list);
	kfree(bridge);
}

static acpi_status
cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	struct acpiphp_bridge *bridge;

	/* cleanup p2p bridges under this P2P bridge
	   in a depth-first manner */
	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
				cleanup_p2p_bridge, NULL, NULL);

	bridge = acpiphp_handle_to_bridge(handle);
	if (bridge)
		cleanup_bridge(bridge);

	return AE_OK;
}

static void remove_bridge(acpi_handle handle)
{
	struct acpiphp_bridge *bridge;

	/* cleanup p2p bridges under this host bridge
	   in a depth-first manner */
	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
				(u32)1, cleanup_p2p_bridge, NULL, NULL);

	/*
	 * On root bridges with hotplug slots directly underneath (ie,
	 * no p2p bridge inbetween), we call cleanup_bridge(). 
	 *
	 * The else clause cleans up root bridges that either had no
	 * hotplug slots at all, or had a p2p bridge underneath.
	 */
	bridge = acpiphp_handle_to_bridge(handle);
	if (bridge)
		cleanup_bridge(bridge);
	else
		acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
					   handle_hotplug_event_bridge);
}

static struct pci_dev * get_apic_pci_info(acpi_handle handle)
{
	struct acpi_pci_id id;
	struct pci_bus *bus;
	struct pci_dev *dev;

	if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
		return NULL;

	bus = pci_find_bus(id.segment, id.bus);
	if (!bus)
		return NULL;

	dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
	if (!dev)
		return NULL;

	if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
	    (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
	{
		pci_dev_put(dev);
		return NULL;
	}

	return dev;
}

static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
{
	acpi_status status;
	int result = -1;
	unsigned long long gsb;
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object *obj;
	void *table;

	status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
	if (ACPI_SUCCESS(status)) {
		*gsi_base = (u32)gsb;
		return 0;
	}

	status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
	if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
		return -1;

	obj = buffer.pointer;
	if (obj->type != ACPI_TYPE_BUFFER)
		goto out;

	table = obj->buffer.pointer;
	switch (((struct acpi_subtable_header *)table)->type) {
	case ACPI_MADT_TYPE_IO_SAPIC:
		*gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
		result = 0;
		break;
	case ACPI_MADT_TYPE_IO_APIC:
		*gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
		result = 0;
		break;
	default:
		break;
	}
 out:
	kfree(buffer.pointer);
	return result;
}

static acpi_status
ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	acpi_status status;
	unsigned long long sta;
	acpi_handle tmp;
	struct pci_dev *pdev;
	u32 gsi_base;
	u64 phys_addr;
	struct acpiphp_ioapic *ioapic;

	/* Evaluate _STA if present */
	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
	if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
		return AE_CTRL_DEPTH;

	/* Scan only PCI bus scope */
	status = acpi_get_handle(handle, "_HID", &tmp);
	if (ACPI_SUCCESS(status))
		return AE_CTRL_DEPTH;

	if (get_gsi_base(handle, &gsi_base))
		return AE_OK;

	ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
	if (!ioapic)
		return AE_NO_MEMORY;

	pdev = get_apic_pci_info(handle);
	if (!pdev)
		goto exit_kfree;

	if (pci_enable_device(pdev))
		goto exit_pci_dev_put;

	pci_set_master(pdev);

	if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
		goto exit_pci_disable_device;

	phys_addr = pci_resource_start(pdev, 0);
	if (acpi_register_ioapic(handle, phys_addr, gsi_base))
		goto exit_pci_release_region;

	ioapic->gsi_base = gsi_base;
	ioapic->dev = pdev;
	spin_lock(&ioapic_list_lock);
	list_add_tail(&ioapic->list, &ioapic_list);
	spin_unlock(&ioapic_list_lock);

	return AE_OK;

 exit_pci_release_region:
	pci_release_region(pdev, 0);
 exit_pci_disable_device:
	pci_disable_device(pdev);
 exit_pci_dev_put:
	pci_dev_put(pdev);
 exit_kfree:
	kfree(ioapic);

	return AE_OK;
}

static acpi_status
ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	acpi_status status;
	unsigned long long sta;
	acpi_handle tmp;
	u32 gsi_base;
	struct acpiphp_ioapic *pos, *n, *ioapic = NULL;

	/* Evaluate _STA if present */
	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
	if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
		return AE_CTRL_DEPTH;

	/* Scan only PCI bus scope */
	status = acpi_get_handle(handle, "_HID", &tmp);
	if (ACPI_SUCCESS(status))
		return AE_CTRL_DEPTH;

	if (get_gsi_base(handle, &gsi_base))
		return AE_OK;

	acpi_unregister_ioapic(handle, gsi_base);

	spin_lock(&ioapic_list_lock);
	list_for_each_entry_safe(pos, n, &ioapic_list, list) {
		if (pos->gsi_base != gsi_base)
			continue;
		ioapic = pos;
		list_del(&ioapic->list);
		break;
	}
	spin_unlock(&ioapic_list_lock);

	if (!ioapic)
		return AE_OK;

	pci_release_region(ioapic->dev, 0);
	pci_disable_device(ioapic->dev);
	pci_dev_put(ioapic->dev);
	kfree(ioapic);

	return AE_OK;
}

static int acpiphp_configure_ioapics(acpi_handle handle)
{
	ioapic_add(handle, 0, NULL, NULL);
	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
			    ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
	return 0;
}

static int acpiphp_unconfigure_ioapics(acpi_handle handle)
{
	ioapic_remove(handle, 0, NULL, NULL);
	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
			    ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
	return 0;
}

static int power_on_slot(struct acpiphp_slot *slot)
{
	acpi_status status;
	struct acpiphp_func *func;
	struct list_head *l;
	int retval = 0;

	/* if already enabled, just skip */
	if (slot->flags & SLOT_POWEREDON)
		goto err_exit;

	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);

		if (func->flags & FUNC_HAS_PS0) {
			dbg("%s: executing _PS0\n", __func__);
			status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
			if (ACPI_FAILURE(status)) {
				warn("%s: _PS0 failed\n", __func__);
				retval = -1;
				goto err_exit;
			} else
				break;
		}
	}

	/* TBD: evaluate _STA to check if the slot is enabled */

	slot->flags |= SLOT_POWEREDON;

 err_exit:
	return retval;
}


static int power_off_slot(struct acpiphp_slot *slot)
{
	acpi_status status;
	struct acpiphp_func *func;
	struct list_head *l;

	int retval = 0;

	/* if already disabled, just skip */
	if ((slot->flags & SLOT_POWEREDON) == 0)
		goto err_exit;

	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);

		if (func->flags & FUNC_HAS_PS3) {
			status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
			if (ACPI_FAILURE(status)) {
				warn("%s: _PS3 failed\n", __func__);
				retval = -1;
				goto err_exit;
			} else
				break;
		}
	}

	/* TBD: evaluate _STA to check if the slot is disabled */

	slot->flags &= (~SLOT_POWEREDON);

 err_exit:
	return retval;
}



/**
 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
 * @bus: bus to start search with
 */
static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
{
	struct list_head *tmp;
	unsigned char max, n;

	/*
	 * pci_bus_max_busnr will return the highest
	 * reserved busnr for all these children.
	 * that is equivalent to the bus->subordinate
	 * value.  We don't want to use the parent's
	 * bus->subordinate value because it could have
	 * padding in it.
	 */
	max = bus->secondary;

	list_for_each(tmp, &bus->children) {
		n = pci_bus_max_busnr(pci_bus_b(tmp));
		if (n > max)
			max = n;
	}
	return max;
}


/**
 * acpiphp_bus_add - add a new bus to acpi subsystem
 * @func: acpiphp_func of the bridge
 */
static int acpiphp_bus_add(struct acpiphp_func *func)
{
	acpi_handle phandle;
	struct acpi_device *device, *pdevice;
	int ret_val;

	acpi_get_parent(func->handle, &phandle);
	if (acpi_bus_get_device(phandle, &pdevice)) {
		dbg("no parent device, assuming NULL\n");
		pdevice = NULL;
	}
	if (!acpi_bus_get_device(func->handle, &device)) {
		dbg("bus exists... trim\n");
		/* this shouldn't be in here, so remove
		 * the bus then re-add it...
		 */
		ret_val = acpi_bus_trim(device, 1);
		dbg("acpi_bus_trim return %x\n", ret_val);
	}

	ret_val = acpi_bus_add(&device, pdevice, func->handle,
		ACPI_BUS_TYPE_DEVICE);
	if (ret_val) {
		dbg("error adding bus, %x\n",
			-ret_val);
		goto acpiphp_bus_add_out;
	}
	/*
	 * try to start anyway.  We could have failed to add
	 * simply because this bus had previously been added
	 * on another add.  Don't bother with the return value
	 * we just keep going.
	 */
	ret_val = acpi_bus_start(device);

acpiphp_bus_add_out:
	return ret_val;
}


/**
 * acpiphp_bus_trim - trim a bus from acpi subsystem
 * @handle: handle to acpi namespace
 */
static int acpiphp_bus_trim(acpi_handle handle)
{
	struct acpi_device *device;
	int retval;

	retval = acpi_bus_get_device(handle, &device);
	if (retval) {
		dbg("acpi_device not found\n");
		return retval;
	}

	retval = acpi_bus_trim(device, 1);
	if (retval)
		err("cannot remove from acpi list\n");

	return retval;
}

/**
 * enable_device - enable, configure a slot
 * @slot: slot to be enabled
 *
 * This function should be called per *physical slot*,
 * not per each slot object in ACPI namespace.
 */
static int __ref enable_device(struct acpiphp_slot *slot)
{
	struct pci_dev *dev;
	struct pci_bus *bus = slot->bridge->pci_bus;
	struct list_head *l;
	struct acpiphp_func *func;
	int retval = 0;
	int num, max, pass;
	acpi_status status;

	if (slot->flags & SLOT_ENABLED)
		goto err_exit;

	/* sanity check: dev should be NULL when hot-plugged in */
	dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
	if (dev) {
		/* This case shouldn't happen */
		err("pci_dev structure already exists.\n");
		pci_dev_put(dev);
		retval = -1;
		goto err_exit;
	}

	num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
	if (num == 0) {
		err("No new device found\n");
		retval = -1;
		goto err_exit;
	}

	max = acpiphp_max_busnr(bus);
	for (pass = 0; pass < 2; pass++) {
		list_for_each_entry(dev, &bus->devices, bus_list) {
			if (PCI_SLOT(dev->devfn) != slot->device)
				continue;
			if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
			    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
				max = pci_scan_bridge(bus, dev, max, pass);
				if (pass && dev->subordinate)
					pci_bus_size_bridges(dev->subordinate);
			}
		}
	}

	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);
		acpiphp_bus_add(func);
	}

	pci_bus_assign_resources(bus);
	acpiphp_sanitize_bus(bus);
	acpiphp_set_hpp_values(slot->bridge->handle, bus);
	list_for_each_entry(func, &slot->funcs, sibling)
		acpiphp_configure_ioapics(func->handle);
	pci_enable_bridges(bus);
	pci_bus_add_devices(bus);

	/* associate pci_dev to our representation */
	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);
		func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
							func->function));
		if (!func->pci_dev)
			continue;

		if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
		    func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
			continue;

		status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
		if (ACPI_FAILURE(status))
			warn("find_p2p_bridge failed (error code = 0x%x)\n",
				status);
	}

	slot->flags |= SLOT_ENABLED;

 err_exit:
	return retval;
}

static void disable_bridges(struct pci_bus *bus)
{
	struct pci_dev *dev;
	list_for_each_entry(dev, &bus->devices, bus_list) {
		if (dev->subordinate) {
			disable_bridges(dev->subordinate);
			pci_disable_device(dev);
		}
	}
}

/**
 * disable_device - disable a slot
 * @slot: ACPI PHP slot
 */
static int disable_device(struct acpiphp_slot *slot)
{
	int retval = 0;
	struct acpiphp_func *func;
	struct list_head *l;

	/* is this slot already disabled? */
	if (!(slot->flags & SLOT_ENABLED))
		goto err_exit;

	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);

		if (func->bridge) {
			/* cleanup p2p bridges under this P2P bridge */
			cleanup_p2p_bridge(func->bridge->handle,
						(u32)1, NULL, NULL);
			func->bridge = NULL;
		}

		if (func->pci_dev) {
			pci_stop_bus_device(func->pci_dev);
			if (func->pci_dev->subordinate) {
				disable_bridges(func->pci_dev->subordinate);
				pci_disable_device(func->pci_dev);
			}
		}
	}

	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);

		acpiphp_unconfigure_ioapics(func->handle);
		acpiphp_bus_trim(func->handle);
		/* try to remove anyway.
		 * acpiphp_bus_add might have been failed */

		if (!func->pci_dev)
			continue;

		pci_remove_bus_device(func->pci_dev);
		pci_dev_put(func->pci_dev);
		func->pci_dev = NULL;
	}

	slot->flags &= (~SLOT_ENABLED);

 err_exit:
	return retval;
}


/**
 * get_slot_status - get ACPI slot status
 * @slot: ACPI PHP slot
 *
 * If a slot has _STA for each function and if any one of them
 * returned non-zero status, return it.
 *