From patchwork Mon Aug 15 15:23:28 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 9281383 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 592A2607FD for ; Mon, 15 Aug 2016 15:27:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4A9AE28D26 for ; Mon, 15 Aug 2016 15:27:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3F86328D2A; Mon, 15 Aug 2016 15:27:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BAF1128D26 for ; Mon, 15 Aug 2016 15:27:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752887AbcHOPX5 (ORCPT ); Mon, 15 Aug 2016 11:23:57 -0400 Received: from foss.arm.com ([217.140.101.70]:41171 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753240AbcHOPXz (ORCPT ); Mon, 15 Aug 2016 11:23:55 -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 1297CBBB; Mon, 15 Aug 2016 08:25:27 -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 6585A3F32C; Mon, 15 Aug 2016 08:23:52 -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 , Nate Watterson , 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 v4 03/15] drivers: acpi: iort: introduce linker section for IORT entries probing Date: Mon, 15 Aug 2016 16:23:28 +0100 Message-Id: <1471274620-20754-4-git-send-email-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1471274620-20754-1-git-send-email-lorenzo.pieralisi@arm.com> References: <1471274620-20754-1-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 X-Virus-Scanned: ClamAV using ClamSMTP 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 Reviewed-by: Hanjun Guo --- drivers/acpi/arm64/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/arm64/iort.c b/drivers/acpi/arm64/iort.c index 2543f60..cad7d1d 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/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 2456397..7ee4e0c 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -546,6 +546,7 @@ 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__ */