ACPI: Optimize acpi_get_pci_rootbridge_handle() to boot faster (d91a0078) · Commits · 戴 / test

drivers/acpi/glue.c

+0 −123

Original line number	Diff line number	Diff line
		@@ -86,129 +86,6 @@ static int acpi_find_bridge_device(struct device dev, acpi_handle handle)
		return ret;
		}

		/* Get PCI root bridge's handle from its segment and bus number */
		struct acpi_find_pci_root {
		unsigned int seg;
		unsigned int bus;
		acpi_handle handle;
		};

		static acpi_status
		do_root_bridge_busnr_callback(struct acpi_resource resource, void data)
		{
		unsigned long *busnr = data;
		struct acpi_resource_address64 address;

		if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 &&
		resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 &&
		resource->type != ACPI_RESOURCE_TYPE_ADDRESS64)
		return AE_OK;

		acpi_resource_to_address64(resource, &address);
		if ((address.address_length > 0) &&
		(address.resource_type == ACPI_BUS_NUMBER_RANGE))
		*busnr = address.minimum;

		return AE_OK;
		}

		static int get_root_bridge_busnr(acpi_handle handle)
		{
		acpi_status status;
		unsigned long bus, bbn;
		struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

		acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);

		status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL,
		&bbn);
		if (status == AE_NOT_FOUND) {
		/* Assume bus = 0 */
		printk(KERN_INFO PREFIX
		"Assume root bridge [%s] bus is 0\n",
		(char *)buffer.pointer);
		status = AE_OK;
		bbn = 0;
		}
		if (ACPI_FAILURE(status)) {
		bbn = -ENODEV;
		goto exit;
		}
		if (bbn > 0)
		goto exit;

		/* _BBN in some systems return 0 for all root bridges */
		bus = -1;
		status = acpi_walk_resources(handle, METHOD_NAME__CRS,
		do_root_bridge_busnr_callback, &bus);
		/* If _CRS failed, we just use _BBN */
		if (ACPI_FAILURE(status) \|\| (bus == -1))
		goto exit;
		/* We select _CRS */
		if (bbn != bus) {
		printk(KERN_INFO PREFIX
		"_BBN and _CRS returns different value for %s. Select _CRS\n",
		(char *)buffer.pointer);
		bbn = bus;
		}
		exit:
		kfree(buffer.pointer);
		return (int)bbn;
		}

		static acpi_status
		find_pci_rootbridge(acpi_handle handle, u32 lvl, void context, void *rv)
		{
		struct acpi_find_pci_root find = (struct acpi_find_pci_root )context;
		unsigned long seg, bus;
		acpi_status status;
		int tmp;
		struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

		acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);

		status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, &seg);
		if (status == AE_NOT_FOUND) {
		/* Assume seg = 0 */
		status = AE_OK;
		seg = 0;
		}
		if (ACPI_FAILURE(status)) {
		status = AE_CTRL_DEPTH;
		goto exit;
		}

		tmp = get_root_bridge_busnr(handle);
		if (tmp < 0) {
		printk(KERN_ERR PREFIX
		"Find root bridge failed for %s\n",
		(char *)buffer.pointer);
		status = AE_CTRL_DEPTH;
		goto exit;
		}
		bus = tmp;

		if (seg == find->seg && bus == find->bus)
		{
		find->handle = handle;
		status = AE_CTRL_TERMINATE;
		}
		else
		status = AE_OK;
		exit:
		kfree(buffer.pointer);
		return status;
		}

		acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
		{
		struct acpi_find_pci_root find = { seg, bus, NULL };

		acpi_get_devices(PCI_ROOT_HID_STRING, find_pci_rootbridge, &find, NULL);
		return find.handle;
		}
		EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);

		/* Get device's handler per its address under its parent */
		struct acpi_find_child {
		acpi_handle handle;

drivers/acpi/pci_root.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -117,6 +117,19 @@ void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)

		EXPORT_SYMBOL(acpi_pci_unregister_driver);

		acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
		{
		struct acpi_pci_root *tmp;

		list_for_each_entry(tmp, &acpi_pci_roots, node) {
		if ((tmp->id.segment == (u16) seg) && (tmp->id.bus == (u16) bus))
		return tmp->device->handle;
		}
		return NULL;
		}

		EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);

		static acpi_status
		get_root_bridge_busnr_callback(struct acpi_resource resource, void data)
		{

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