From patchwork Fri Oct 6 14:04:48 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shameerali Kolothum Thodi X-Patchwork-Id: 9989555 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 0E738603FA for ; Fri, 6 Oct 2017 14:08:06 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E3BB028DB0 for ; Fri, 6 Oct 2017 14:08:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D848228DB4; Fri, 6 Oct 2017 14:08:05 +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=ham 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 54C2528DB1 for ; Fri, 6 Oct 2017 14:08:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751875AbdJFOIB (ORCPT ); Fri, 6 Oct 2017 10:08:01 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:7500 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751755AbdJFOH7 (ORCPT ); Fri, 6 Oct 2017 10:07:59 -0400 Received: from 172.30.72.58 (EHLO DGGEMS403-HUB.china.huawei.com) ([172.30.72.58]) by dggrg04-dlp.huawei.com (MOS 4.4.6-GA FastPath queued) with ESMTP id DIO33388; Fri, 06 Oct 2017 22:07:53 +0800 (CST) Received: from S00345302A-PC.china.huawei.com (10.202.227.237) by DGGEMS403-HUB.china.huawei.com (10.3.19.203) with Microsoft SMTP Server id 14.3.301.0; Fri, 6 Oct 2017 22:07:26 +0800 From: Shameer Kolothum To: , , , , , , , CC: , , , , , , , , , Shameer Kolothum Subject: [PATCH v9 2/4] iommu/dma: Add a helper function to reserve HW MSI address regions for IOMMU drivers Date: Fri, 6 Oct 2017 15:04:48 +0100 Message-ID: <20171006140450.89652-3-shameerali.kolothum.thodi@huawei.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20171006140450.89652-1-shameerali.kolothum.thodi@huawei.com> References: <20171006140450.89652-1-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.202.227.237] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090201.59D78E39.0312, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: ccee44145571a8a2311c8cc4b0d93011 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 IOMMU drivers can use this to implement their .get_resv_regions callback for HW MSI specific reservations(e.g. ARM GICv3 ITS MSI region). Signed-off-by: Shameer Kolothum --- drivers/iommu/dma-iommu.c | 20 ++++++++++++++++++++ include/linux/dma-iommu.h | 7 +++++++ 2 files changed, 27 insertions(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 9d1cebe..bae677e 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -19,6 +19,7 @@ * along with this program. If not, see . */ +#include #include #include #include @@ -27,6 +28,7 @@ #include #include #include +#include #include #include #include @@ -198,6 +200,24 @@ void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list) } EXPORT_SYMBOL(iommu_dma_get_resv_regions); +/** + * iommu_dma_get_msi_resv_regions - Reserved region driver helper + * @dev: Device from iommu_get_resv_regions() + * @list: Reserved region list from iommu_get_resv_regions() + * + * IOMMU drivers can use this to implement their .get_resv_regions + * callback for HW MSI specific reservations. For now, this only + * covers ITS MSI region reservation using ACPI IORT helper function. + */ +int iommu_dma_get_msi_resv_regions(struct device *dev, struct list_head *list) +{ + if (!is_of_node(dev->iommu_fwspec->iommu_fwnode)) + return iort_iommu_msi_get_resv_regions(dev, list); + + return -ENODEV; +} +EXPORT_SYMBOL(iommu_dma_get_msi_resv_regions); + static int cookie_init_hw_msi_region(struct iommu_dma_cookie *cookie, phys_addr_t start, phys_addr_t end) { diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h index 92f2083..6062ef0 100644 --- a/include/linux/dma-iommu.h +++ b/include/linux/dma-iommu.h @@ -74,6 +74,8 @@ void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle, void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg); void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list); +int iommu_dma_get_msi_resv_regions(struct device *dev, struct list_head *list); + #else struct iommu_domain; @@ -107,6 +109,11 @@ static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_he { } +static inline int iommu_dma_get_msi_resv_regions(struct device *dev, struct list_head *list) +{ + return -ENODEV; +} + #endif /* CONFIG_IOMMU_DMA */ #endif /* __KERNEL__ */ #endif /* __DMA_IOMMU_H */