From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932954AbcFGNbZ (ORCPT ); Tue, 7 Jun 2016 09:31:25 -0400 Received: from foss.arm.com ([217.140.101.70]:44454 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932915AbcFGNbT (ORCPT ); Tue, 7 Jun 2016 09:31:19 -0400 From: Lorenzo Pieralisi To: iommu@lists.linux-foundation.org Cc: Lorenzo Pieralisi , Hanjun Guo , Tomasz Nowicki , "Rafael J. Wysocki" , Will Deacon , Marc Zyngier , Robin Murphy , Joerg Roedel , Jon Masters , Sinan Kaya , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH v2 07/15] drivers: acpi: iort: add node match function Date: Tue, 7 Jun 2016 14:31:02 +0100 Message-Id: <1465306270-27076-8-git-send-email-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1465306270-27076-1-git-send-email-lorenzo.pieralisi@arm.com> References: <1465306270-27076-1-git-send-email-lorenzo.pieralisi@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Device drivers (eg ARM SMMU) need to know if a specific component is part of the IORT table, so that kernel data structures are not initialized at initcalls time if the respective component is not part of the IORT table. To this end, this patch adds a trivial function that allows detecting if a given IORT node type is present or not in the ACPI table, providing an ACPI IORT equivalent for of_find_matching_node(). Signed-off-by: Lorenzo Pieralisi Cc: Hanjun Guo Cc: Tomasz Nowicki Cc: "Rafael J. Wysocki" --- drivers/acpi/iort.c | 15 +++++++++++++++ include/linux/iort.h | 2 ++ 2 files changed, 17 insertions(+) diff --git a/drivers/acpi/iort.c b/drivers/acpi/iort.c index 0ba6c8a..875edde 100644 --- a/drivers/acpi/iort.c +++ b/drivers/acpi/iort.c @@ -213,6 +213,21 @@ iort_scan_node(enum acpi_iort_node_type type, } static acpi_status +iort_match_callback(struct acpi_iort_node *node, void *context) +{ + return AE_OK; +} + +bool iort_node_match(u8 type) +{ + struct acpi_iort_node *node; + + node = iort_scan_node(type, iort_match_callback, NULL); + + return node != NULL; +} + +static acpi_status iort_find_dev_callback(struct acpi_iort_node *node, void *context) { struct device *dev = context; diff --git a/include/linux/iort.h b/include/linux/iort.h index 5053cc3..5ebe7e5 100644 --- a/include/linux/iort.h +++ b/include/linux/iort.h @@ -27,9 +27,11 @@ int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node); void iort_deregister_domain_token(int trans_id); struct fwnode_handle *iort_its_find_domain_token(int trans_id); #ifdef CONFIG_IORT_TABLE +bool iort_node_match(u8 type); u32 iort_pci_get_msi_rid(struct pci_dev *pdev, u32 req_id); struct irq_domain *iort_pci_get_domain(struct pci_dev *pdev, u32 req_id); #else +static inline bool iort_node_match(u8 type) { return false; } static inline u32 iort_pci_get_msi_rid(struct pci_dev *pdev, u32 req_id) { return req_id; } static inline struct irq_domain * -- 2.6.4