From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756225AbcDNRZ3 (ORCPT ); Thu, 14 Apr 2016 13:25:29 -0400 Received: from foss.arm.com ([217.140.101.70]:44819 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755662AbcDNRXQ (ORCPT ); Thu, 14 Apr 2016 13:23:16 -0400 From: Lorenzo Pieralisi To: iommu@lists.linux-foundation.org Cc: Lorenzo Pieralisi , Tomasz Nowicki , "Rafael J. Wysocki" , Marc Zyngier , Will Deacon , Robin Murphy , Joerg Roedel , Hanjun Guo , 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 04/11] drivers: acpi: iort: introduce linker section for IORT entries probing Date: Thu, 14 Apr 2016 18:25:36 +0100 Message-Id: <1460654743-7896-5-git-send-email-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1460654743-7896-1-git-send-email-lorenzo.pieralisi@arm.com> References: <1460654743-7896-1-git-send-email-lorenzo.pieralisi@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since commit e647b532275b ("ACPI: Add early device probing infrastructure") the kernel has gained the infrastructure that allows adding linker script section entries to execute ACPI driver callbacks (ie probe routines) for all subsystems that register a table entry in the respective kernel section (eg clocksource, irqchip). Since ARM IOMMU devices data is described through IORT tables when booting with ACPI, the ARM IOMMU drivers must be made able to hook ACPI callback routines that are called to probe IORT entries and initialize the respective IOMMU devices. To avoid adding driver specific hooks into IORT table initialization code (breaking therefore code modularity - ie ACPI IORT code must be made aware of ARM SMMU drivers ACPI init callbacks), this patch adds code that allows ARM SMMU drivers to take advantage of the ACPI early probing infrastructure, so that they can add linker script section entries containing drivers callback to be executed on IORT tables detection. Since IORT nodes are differentiated by a type, the callback routines can easily parse the IORT table entries, check the IORT nodes and carry out some actions whenever the IORT node type associated with the driver specific callback is matched. Signed-off-by: Lorenzo Pieralisi Cc: Tomasz Nowicki Cc: "Rafael J. Wysocki" Cc: Marc Zyngier --- drivers/acpi/iort.c | 2 ++ include/asm-generic/vmlinux.lds.h | 1 + include/linux/iort.h | 3 +++ 3 files changed, 6 insertions(+) diff --git a/drivers/acpi/iort.c b/drivers/acpi/iort.c index 98db580..080888a 100644 --- a/drivers/acpi/iort.c +++ b/drivers/acpi/iort.c @@ -372,6 +372,8 @@ static int __init iort_table_detect(void) return -EINVAL; } + acpi_probe_device_table(iort); + return 0; } arch_initcall(iort_table_detect); diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 339125b..0aae448 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -536,6 +536,7 @@ IRQCHIP_OF_MATCH_TABLE() \ ACPI_PROBE_TABLE(irqchip) \ ACPI_PROBE_TABLE(clksrc) \ + ACPI_PROBE_TABLE(iort) \ EARLYCON_TABLE() #define INIT_TEXT \ diff --git a/include/linux/iort.h b/include/linux/iort.h index 148d9a1..766adda 100644 --- a/include/linux/iort.h +++ b/include/linux/iort.h @@ -31,4 +31,7 @@ struct fwnode_handle *iort_pci_get_domain(struct pci_dev *pdev, u32 req_id); int iort_iommu_set_node(struct iommu_ops *ops, struct acpi_iort_node *node, struct fwnode_handle *fwnode); +#define IORT_ACPI_DECLARE(name, table_id, fn) \ + ACPI_DECLARE_PROBE_ENTRY(iort, name, table_id, 0, NULL, 0, fn) + #endif /* __IORT_H__ */ -- 2.6.4