ACPICA: _CID support for PCI Root Bridge detection. (b7a69806) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/acpi/events/evrgnini.c

+125 −38

Original line number	Diff line number	Diff line
		@@ -48,6 +48,11 @@
		#define _COMPONENT ACPI_EVENTS
		ACPI_MODULE_NAME("evrgnini")

		/* Local prototypes */
		static u8 acpi_ev_match_pci_root_bridge(char *id);

		static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node);

		/*******************************************************************************
		*
		* FUNCTION: acpi_ev_system_memory_region_setup
		@@ -62,6 +67,7 @@ ACPI_MODULE_NAME("evrgnini")
		* DESCRIPTION: Setup a system_memory operation region
		*
		******************************************************************************/

		acpi_status
		acpi_ev_system_memory_region_setup(acpi_handle handle,
		u32 function,
		@@ -168,9 +174,9 @@ acpi_ev_pci_config_region_setup(acpi_handle handle,
		union acpi_operand_object *handler_obj;
		struct acpi_namespace_node *parent_node;
		struct acpi_namespace_node *pci_root_node;
		struct acpi_namespace_node *pci_device_node;
		union acpi_operand_object *region_obj =
		(union acpi_operand_object *)handle;
		struct acpi_device_id object_hID;

		ACPI_FUNCTION_TRACE(ev_pci_config_region_setup);

		@@ -215,27 +221,14 @@ acpi_ev_pci_config_region_setup(acpi_handle handle,

		pci_root_node = parent_node;
		while (pci_root_node != acpi_gbl_root_node) {
		status =
		acpi_ut_execute_HID(pci_root_node, &object_hID);
		if (ACPI_SUCCESS(status)) {
		/*
		* Got a valid _HID string, check if this is a PCI root.
		* New for ACPI 3.0: check for a PCI Express root also.
		*/
		if (!
		(ACPI_STRNCMP
		(object_hID.value, PCI_ROOT_HID_STRING,
		sizeof(PCI_ROOT_HID_STRING)))
		\|\|
		!(ACPI_STRNCMP
		(object_hID.value,
		PCI_EXPRESS_ROOT_HID_STRING,
		sizeof(PCI_EXPRESS_ROOT_HID_STRING)))) {

		/* Get the _HID/_CID in order to detect a root_bridge */

		if (acpi_ev_is_pci_root_bridge(pci_root_node)) {

		/* Install a handler for this PCI root bridge */

		status =
		acpi_install_address_space_handler((acpi_handle) pci_root_node, ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL);
		status = acpi_install_address_space_handler((acpi_handle) pci_root_node, ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL);
		if (ACPI_FAILURE(status)) {
		if (status == AE_SAME_HANDLER) {
		/*
		@@ -245,8 +238,7 @@ acpi_ev_pci_config_region_setup(acpi_handle handle,
		*/
		status = AE_OK;
		} else {
		ACPI_EXCEPTION((AE_INFO,
		status,
		ACPI_EXCEPTION((AE_INFO, status,
		"Could not install PciConfig handler for Root Bridge %4.4s",
		acpi_ut_get_node_name
		(pci_root_node)));
		@@ -254,7 +246,6 @@ acpi_ev_pci_config_region_setup(acpi_handle handle,
		}
		break;
		}
		}

		pci_root_node = acpi_ns_get_parent_node(pci_root_node);
		}
		@@ -282,14 +273,25 @@ acpi_ev_pci_config_region_setup(acpi_handle handle,
		/*
		* For PCI_Config space access, we need the segment, bus,
		* device and function numbers. Acquire them here.
		*
		* Find the parent device object. (This allows the operation region to be
		* within a subscope under the device, such as a control method.)
		*/
		pci_device_node = region_obj->region.node;
		while (pci_device_node && (pci_device_node->type != ACPI_TYPE_DEVICE)) {
		pci_device_node = acpi_ns_get_parent_node(pci_device_node);
		}

		if (!pci_device_node) {
		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}

		/*
		* Get the PCI device and function numbers from the _ADR object
		* contained in the parent's scope.
		*/
		status =
		acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, parent_node,
		acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, pci_device_node,
		&pci_value);

		/*
		@@ -327,6 +329,91 @@ acpi_ev_pci_config_region_setup(acpi_handle handle,
		return_ACPI_STATUS(AE_OK);
		}

		/*******************************************************************************
		*
		* FUNCTION: acpi_ev_match_pci_root_bridge
		*
		* PARAMETERS: Id - The HID/CID in string format
		*
		* RETURN: TRUE if the Id is a match for a PCI/PCI-Express Root Bridge
		*
		* DESCRIPTION: Determine if the input ID is a PCI Root Bridge ID.
		*
		******************************************************************************/

		static u8 acpi_ev_match_pci_root_bridge(char *id)
		{

		/*
		* Check if this is a PCI root.
		* ACPI 3.0+: check for a PCI Express root also.
		*/
		if (!(ACPI_STRNCMP(id,
		PCI_ROOT_HID_STRING,
		sizeof(PCI_ROOT_HID_STRING))) \|\|
		!(ACPI_STRNCMP(id,
		PCI_EXPRESS_ROOT_HID_STRING,
		sizeof(PCI_EXPRESS_ROOT_HID_STRING)))) {
		return (TRUE);
		}

		return (FALSE);
		}

		/*******************************************************************************
		*
		* FUNCTION: acpi_ev_is_pci_root_bridge
		*
		* PARAMETERS: Node - Device node being examined
		*
		* RETURN: TRUE if device is a PCI/PCI-Express Root Bridge
		*
		* DESCRIPTION: Determine if the input device represents a PCI Root Bridge by
		* examining the _HID and _CID for the device.
		*
		******************************************************************************/

		static u8 acpi_ev_is_pci_root_bridge(struct acpi_namespace_node *node)
		{
		acpi_status status;
		struct acpi_device_id hid;
		struct acpi_compatible_id_list *cid;
		acpi_native_uint i;

		/*
		* Get the _HID and check for a PCI Root Bridge
		*/
		status = acpi_ut_execute_HID(node, &hid);
		if (ACPI_FAILURE(status)) {
		return (FALSE);
		}

		if (acpi_ev_match_pci_root_bridge(hid.value)) {
		return (TRUE);
		}

		/*
		* The _HID did not match.
		* Get the _CID and check for a PCI Root Bridge
		*/
		status = acpi_ut_execute_CID(node, &cid);
		if (ACPI_FAILURE(status)) {
		return (FALSE);
		}

		/* Check all _CIDs in the returned list */

		for (i = 0; i < cid->count; i++) {
		if (acpi_ev_match_pci_root_bridge(cid->id[i].value)) {
		ACPI_FREE(cid);
		return (TRUE);
		}
		}

		ACPI_FREE(cid);
		return (FALSE);
		}

		/*******************************************************************************
		*
		* FUNCTION: acpi_ev_pci_bar_region_setup