From patchwork Wed Jul 20 11:23:24 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 650644 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3rvZQ66d8hz9t0F for ; Wed, 20 Jul 2016 21:27:26 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753780AbcGTL1Y (ORCPT ); Wed, 20 Jul 2016 07:27:24 -0400 Received: from foss.arm.com ([217.140.101.70]:41272 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753528AbcGTLXs (ORCPT ); Wed, 20 Jul 2016 07:23:48 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id CA0C3443; Wed, 20 Jul 2016 04:24:57 -0700 (PDT) Received: from red-moon.cambridge.arm.com (red-moon.cambridge.arm.com [10.1.206.55]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 04D9E3F215; Wed, 20 Jul 2016 04:23:44 -0700 (PDT) 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 v3 02/13] drivers: acpi: iort: introduce linker section for IORT entries probing Date: Wed, 20 Jul 2016 12:23:24 +0100 Message-Id: <1469013815-24380-3-git-send-email-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1469013815-24380-1-git-send-email-lorenzo.pieralisi@arm.com> References: <1469013815-24380-1-git-send-email-lorenzo.pieralisi@arm.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@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 6611607..1f440d2 100644 --- a/drivers/acpi/iort.c +++ b/drivers/acpi/iort.c @@ -383,4 +383,6 @@ void __init iort_table_detect(void) const char *msg = acpi_format_exception(status); pr_err("Failed to get table, %s\n", msg); } + + acpi_probe_device_table(iort); } diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 6a67ab9..b896ab2 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -538,6 +538,7 @@ 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 d7daba1..9bb30c5 100644 --- a/include/linux/iort.h +++ b/include/linux/iort.h @@ -38,4 +38,7 @@ static inline struct irq_domain * iort_get_device_domain(struct device *dev, u32 req_id) { return NULL; } #endif +#define IORT_ACPI_DECLARE(name, table_id, fn) \ + ACPI_DECLARE_PROBE_ENTRY(iort, name, table_id, 0, NULL, 0, fn) + #endif /* __IORT_H__ */