Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933369AbcKIOT2 (ORCPT ); Wed, 9 Nov 2016 09:19:28 -0500 Received: from foss.arm.com ([217.140.101.70]:54900 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933222AbcKIOTV (ORCPT ); Wed, 9 Nov 2016 09:19:21 -0500 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 , Eric Auger , Sinan Kaya , Nate Watterson , Prem Mallappa , Dennis Chen , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v7 08/16] drivers: acpi: iort: add node match function Date: Wed, 9 Nov 2016 14:19:40 +0000 Message-Id: <20161109141948.19244-9-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.10.0 In-Reply-To: <20161109141948.19244-1-lorenzo.pieralisi@arm.com> References: <20161109141948.19244-1-lorenzo.pieralisi@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2265 Lines: 65 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 Tested-by: Hanjun Guo Tested-by: Tomasz Nowicki Cc: Hanjun Guo Cc: Tomasz Nowicki Cc: "Rafael J. Wysocki" --- drivers/acpi/arm64/iort.c | 15 +++++++++++++++ include/linux/acpi_iort.h | 2 ++ 2 files changed, 17 insertions(+) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 1ac2720..4bb6acb 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -227,6 +227,21 @@ static struct acpi_iort_node *iort_scan_node(enum acpi_iort_node_type type, return NULL; } +static acpi_status +iort_match_type_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_type_callback, NULL); + + return node != NULL; +} + static acpi_status iort_match_node_callback(struct acpi_iort_node *node, void *context) { diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h index d16fdda..17bb078 100644 --- a/include/linux/acpi_iort.h +++ b/include/linux/acpi_iort.h @@ -28,10 +28,12 @@ void iort_deregister_domain_token(int trans_id); struct fwnode_handle *iort_find_domain_token(int trans_id); #ifdef CONFIG_ACPI_IORT void acpi_iort_init(void); +bool iort_node_match(u8 type); u32 iort_msi_map_rid(struct device *dev, u32 req_id); struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id); #else static inline void acpi_iort_init(void) { } +static inline bool iort_node_match(u8 type) { return false; } static inline u32 iort_msi_map_rid(struct device *dev, u32 req_id) { return req_id; } static inline struct irq_domain *iort_get_device_domain(struct device *dev, -- 2.10.0