Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030445AbcJRQEE (ORCPT ); Tue, 18 Oct 2016 12:04:04 -0400 Received: from foss.arm.com ([217.140.101.70]:35144 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S936310AbcJRQDs (ORCPT ); Tue, 18 Oct 2016 12:03:48 -0400 From: Lorenzo Pieralisi To: iommu@lists.linux-foundation.org Cc: Lorenzo Pieralisi , "Rafael J. Wysocki" , Will Deacon , Marc Zyngier , Robin Murphy , Joerg Roedel , Tomasz Nowicki , Hanjun Guo , 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 v6 01/16] drivers: acpi: add FWNODE_ACPI_STATIC fwnode type Date: Tue, 18 Oct 2016 17:03:59 +0100 Message-Id: <20161018160414.1228-2-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.10.0 In-Reply-To: <20161018160414.1228-1-lorenzo.pieralisi@arm.com> References: <20161018160414.1228-1-lorenzo.pieralisi@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2899 Lines: 83 On systems booting with a device tree, every struct device is associated with a struct device_node, that provides its DT firmware representation. The device node can be used in generic kernel contexts (eg IRQ translation, IOMMU streamid mapping), to retrieve the properties associated with the device and carry out kernel operations accordingly. Owing to the 1:1 relationship between the device and its device_node, the device_node can also be used as a look-up token for the device (eg looking up a device through its device_node), to retrieve the device in kernel paths where the device_node is available. On systems booting with ACPI, the same abstraction provided by the device_node is required to provide look-up functionality. The struct acpi_device, that represents firmware objects in the ACPI namespace already includes a struct fwnode_handle of type FWNODE_ACPI as their member; the same abstraction is missing though for devices that are instantiated out of static ACPI tables entries (eg ARM SMMU devices). Add a new fwnode_handle type to associate devices created out of static ACPI table entries to the respective firmware components and create a simple ACPI core layer interface to dynamically allocate and free the corresponding firmware nodes so that kernel subsystems can use it to instantiate the nodes and associate them with the respective devices. Signed-off-by: Lorenzo Pieralisi Reviewed-by: Hanjun Guo Cc: "Rafael J. Wysocki" --- include/linux/acpi.h | 21 +++++++++++++++++++++ include/linux/fwnode.h | 3 ++- 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/include/linux/acpi.h b/include/linux/acpi.h index ddbeda6..a284273 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -56,6 +56,27 @@ static inline acpi_handle acpi_device_handle(struct acpi_device *adev) acpi_fwnode_handle(adev) : NULL) #define ACPI_HANDLE(dev) acpi_device_handle(ACPI_COMPANION(dev)) +static inline struct fwnode_handle *acpi_alloc_fwnode_static(void) +{ + struct fwnode_handle *fwnode; + + fwnode = kzalloc(sizeof(struct fwnode_handle), GFP_KERNEL); + if (!fwnode) + return NULL; + + fwnode->type = FWNODE_ACPI_STATIC; + + return fwnode; +} + +static inline void acpi_free_fwnode_static(struct fwnode_handle *fwnode) +{ + if (WARN_ON(!fwnode || fwnode->type != FWNODE_ACPI_STATIC)) + return; + + kfree(fwnode); +} + /** * ACPI_DEVICE_CLASS - macro used to describe an ACPI device with * the PCI-defined class-code information diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h index 8516717..8bd28ce 100644 --- a/include/linux/fwnode.h +++ b/include/linux/fwnode.h @@ -17,8 +17,9 @@ enum fwnode_type { FWNODE_OF, FWNODE_ACPI, FWNODE_ACPI_DATA, + FWNODE_ACPI_STATIC, FWNODE_PDATA, - FWNODE_IRQCHIP, + FWNODE_IRQCHIP }; struct fwnode_handle { -- 2.10.0