From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6C17C10F14 for ; Thu, 18 Apr 2019 17:26:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9EE7F2183F for ; Thu, 18 Apr 2019 17:26:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389829AbfDRR00 (ORCPT ); Thu, 18 Apr 2019 13:26:26 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:38048 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731317AbfDRR0Y (ORCPT ); Thu, 18 Apr 2019 13:26:24 -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 97BA71688; Thu, 18 Apr 2019 10:26:23 -0700 (PDT) Received: from e108454-lin.cambridge.arm.com (e108454-lin.cambridge.arm.com [10.1.196.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 604463F557; Thu, 18 Apr 2019 10:26:21 -0700 (PDT) From: Julien Grall To: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org Cc: logang@deltatee.com, douliyangs@gmail.com, miquel.raynal@bootlin.com, marc.zyngier@arm.com, jason@lakedaemon.net, tglx@linutronix.de, joro@8bytes.org, robin.murphy@arm.com, bigeasy@linutronix.de, linux-rt-users@vger.kernel.org, Julien Grall Subject: [PATCH 1/7] genirq/msi: Add a new field in msi_desc to store an IOMMU cookie Date: Thu, 18 Apr 2019 18:26:05 +0100 Message-Id: <20190418172611.21561-2-julien.grall@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190418172611.21561-1-julien.grall@arm.com> References: <20190418172611.21561-1-julien.grall@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When an MSI doorbell is located downstream of an IOMMU, it is required to swizzle the physical address with an appropriately-mapped IOVA for any device attached to one of our DMA ops domain. At the moment, the allocation of the mapping may be done when composing the message. However, the composing may be done in non-preemtible context while the allocation requires to be called from preemptible context. A follow-up patch will split the current logic in two functions requiring to keep an IOMMU cookie per MSI. This patch introduces a new field in msi_desc to store an IOMMU cookie when CONFIG_IOMMU_DMA is selected. Signed-off-by: Julien Grall --- include/linux/msi.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/msi.h b/include/linux/msi.h index 7e9b81c3b50d..d7907feef1bb 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -77,6 +77,9 @@ struct msi_desc { struct device *dev; struct msi_msg msg; struct irq_affinity_desc *affinity; +#ifdef CONFIG_IOMMU_DMA + const void *iommu_cookie; +#endif union { /* PCI MSI/X specific data */ -- 2.11.0