From patchwork Thu Aug 20 15:08:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robin Murphy X-Patchwork-Id: 11726579 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B0B24109B for ; Thu, 20 Aug 2020 15:11:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A3049208DB for ; Thu, 20 Aug 2020 15:11:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728466AbgHTPLx (ORCPT ); Thu, 20 Aug 2020 11:11:53 -0400 Received: from foss.arm.com ([217.140.110.172]:41100 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728722AbgHTPJg (ORCPT ); Thu, 20 Aug 2020 11:09:36 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A704E1477; Thu, 20 Aug 2020 08:09:35 -0700 (PDT) Received: from e121345-lin.cambridge.arm.com (e121345-lin.cambridge.arm.com [10.1.196.37]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 226C33F6CF; Thu, 20 Aug 2020 08:09:32 -0700 (PDT) From: Robin Murphy To: hch@lst.de, joro@8bytes.org, linux@armlinux.org.uk Cc: will@kernel.org, inki.dae@samsung.com, sw0312.kim@samsung.com, kyungmin.park@samsung.com, m.szyprowski@samsung.com, agross@kernel.org, bjorn.andersson@linaro.org, thierry.reding@gmail.com, jonathanh@nvidia.com, vdumpa@nvidia.com, digetx@gmail.com, matthias.bgg@gmail.com, yong.wu@mediatek.com, geert+renesas@glider.be, magnus.damm@gmail.com, t-kristo@ti.com, s-anna@ti.com, laurent.pinchart@ideasonboard.com, linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, linux-samsung-soc@vger.kernel.org, linux-tegra@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 11/18] iommu/omap: Add IOMMU_DOMAIN_DMA support Date: Thu, 20 Aug 2020 16:08:30 +0100 Message-Id: <5ac3788f9f61f7698cfa9c5924d62714e230f678.1597931876.git.robin.murphy@arm.com> X-Mailer: git-send-email 2.28.0.dirty In-Reply-To: References: MIME-Version: 1.0 Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Now that arch/arm is wired up for default domains and iommu-dma, implement the corresponding driver-side support for DMA domains. Signed-off-by: Robin Murphy --- drivers/iommu/omap-iommu.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c index 71f29c0927fc..ea25c2fe0418 100644 --- a/drivers/iommu/omap-iommu.c +++ b/drivers/iommu/omap-iommu.c @@ -9,6 +9,7 @@ * Paul Mundt and Toshihiro Kobayashi */ +#include #include #include #include @@ -1574,13 +1575,19 @@ static struct iommu_domain *omap_iommu_domain_alloc(unsigned type) { struct omap_iommu_domain *omap_domain; - if (type != IOMMU_DOMAIN_UNMANAGED) + if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA) return NULL; omap_domain = kzalloc(sizeof(*omap_domain), GFP_KERNEL); if (!omap_domain) return NULL; + if (type == IOMMU_DOMAIN_DMA && + iommu_get_dma_cookie(&omap_domain->domain)) { + kfree(omap_domain); + return NULL; + } + spin_lock_init(&omap_domain->lock); omap_domain->domain.geometry.aperture_start = 0; @@ -1601,6 +1608,7 @@ static void omap_iommu_domain_free(struct iommu_domain *domain) if (omap_domain->dev) _omap_iommu_detach_dev(omap_domain, omap_domain->dev); + iommu_put_dma_cookie(&omap_domain->domain); kfree(omap_domain); } @@ -1736,6 +1744,17 @@ static struct iommu_group *omap_iommu_device_group(struct device *dev) return group; } +static int omap_iommu_of_xlate(struct device *dev, + struct of_phandle_args *args) +{ + /* + * Logically, some of the housekeeping from _omap_iommu_add_device() + * should probably move here, but the minimum we *need* is simply to + * cooperate with of_iommu at all to let iommu-dma work. + */ + return 0; +} + static const struct iommu_ops omap_iommu_ops = { .domain_alloc = omap_iommu_domain_alloc, .domain_free = omap_iommu_domain_free, @@ -1747,6 +1766,7 @@ static const struct iommu_ops omap_iommu_ops = { .probe_device = omap_iommu_probe_device, .release_device = omap_iommu_release_device, .device_group = omap_iommu_device_group, + .of_xlate = omap_iommu_of_xlate, .pgsize_bitmap = OMAP_IOMMU_PGSIZES, };