From patchwork Thu Aug 20 15:08:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robin Murphy X-Patchwork-Id: 11726595 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 2E9F5109B for ; Thu, 20 Aug 2020 15:12:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1A66D21775 for ; Thu, 20 Aug 2020 15:12:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728879AbgHTPMD (ORCPT ); Thu, 20 Aug 2020 11:12:03 -0400 Received: from foss.arm.com ([217.140.110.172]:41020 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727053AbgHTPJ3 (ORCPT ); Thu, 20 Aug 2020 11:09:29 -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 370C8143B; Thu, 20 Aug 2020 08:09:28 -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 863493F6CF; Thu, 20 Aug 2020 08:09:24 -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 09/18] iommu/mediatek-v1: Add IOMMU_DOMAIN_DMA support Date: Thu, 20 Aug 2020 16:08:28 +0100 Message-Id: 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 groups and DMA domains to replace the shared mapping workaround. Signed-off-by: Robin Murphy Tested-by: Yong Wu --- drivers/iommu/mtk_iommu.h | 2 - drivers/iommu/mtk_iommu_v1.c | 153 +++++++++++------------------------ 2 files changed, 48 insertions(+), 107 deletions(-) diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h index 122925dbe547..6253e98d810c 100644 --- a/drivers/iommu/mtk_iommu.h +++ b/drivers/iommu/mtk_iommu.h @@ -67,8 +67,6 @@ struct mtk_iommu_data { struct iommu_device iommu; const struct mtk_iommu_plat_data *plat_data; - struct dma_iommu_mapping *mapping; /* For mtk_iommu_v1.c */ - struct list_head list; struct mtk_smi_larb_iommu larb_imu[MTK_LARB_NR_MAX]; }; diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c index 82ddfe9170d4..40c89b8d3ac4 100644 --- a/drivers/iommu/mtk_iommu_v1.c +++ b/drivers/iommu/mtk_iommu_v1.c @@ -28,7 +28,6 @@ #include #include #include -#include #include #include #include @@ -240,13 +239,18 @@ static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type) { struct mtk_iommu_domain *dom; - if (type != IOMMU_DOMAIN_UNMANAGED) + if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA) return NULL; dom = kzalloc(sizeof(*dom), GFP_KERNEL); if (!dom) return NULL; + if (type == IOMMU_DOMAIN_DMA && iommu_get_dma_cookie(&dom->domain)) { + kfree(dom); + return NULL; + } + return &dom->domain; } @@ -257,6 +261,7 @@ static void mtk_iommu_domain_free(struct iommu_domain *domain) dma_free_coherent(data->dev, M2701_IOMMU_PGT_SIZE, dom->pgt_va, dom->pgt_pa); + iommu_put_dma_cookie(domain); kfree(to_mtk_domain(domain)); } @@ -265,14 +270,8 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain, { struct mtk_iommu_data *data = dev_iommu_priv_get(dev); struct mtk_iommu_domain *dom = to_mtk_domain(domain); - struct dma_iommu_mapping *mtk_mapping; int ret; - /* Only allow the domain created internally. */ - mtk_mapping = data->mapping; - if (mtk_mapping->domain != domain) - return 0; - if (!data->m4u_dom) { data->m4u_dom = dom; ret = mtk_iommu_domain_finalise(data); @@ -358,18 +357,39 @@ static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain, static const struct iommu_ops mtk_iommu_ops; -/* - * MTK generation one iommu HW only support one iommu domain, and all the client - * sharing the same iova address space. - */ -static int mtk_iommu_create_mapping(struct device *dev, - struct of_phandle_args *args) +static struct iommu_device *mtk_iommu_probe_device(struct device *dev) { struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); struct mtk_iommu_data *data; + + if (!fwspec || fwspec->ops != &mtk_iommu_ops) + return ERR_PTR(-ENODEV); /* Not a iommu client device */ + + data = dev_iommu_priv_get(dev); + + return &data->iommu; +} + +static void mtk_iommu_release_device(struct device *dev) +{ + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); + + if (!fwspec || fwspec->ops != &mtk_iommu_ops) + return; + + iommu_fwspec_free(dev); +} + +static struct iommu_group *mtk_iommu_device_group(struct device *dev) +{ + struct mtk_iommu_data *data = dev_iommu_priv_get(dev); + + return iommu_group_ref_get(data->m4u_group); +} + +static int mtk_iommu_of_xlate(struct device *dev, struct of_phandle_args *args) +{ struct platform_device *m4updev; - struct dma_iommu_mapping *mtk_mapping; - int ret; if (args->args_count != 1) { dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n", @@ -377,15 +397,6 @@ static int mtk_iommu_create_mapping(struct device *dev, return -EINVAL; } - if (!fwspec) { - ret = iommu_fwspec_init(dev, &args->np->fwnode, &mtk_iommu_ops); - if (ret) - return ret; - fwspec = dev_iommu_fwspec_get(dev); - } else if (dev_iommu_fwspec_get(dev)->ops != &mtk_iommu_ops) { - return -EINVAL; - } - if (!dev_iommu_priv_get(dev)) { /* Get the m4u device */ m4updev = of_find_device_by_node(args->np); @@ -395,83 +406,7 @@ static int mtk_iommu_create_mapping(struct device *dev, dev_iommu_priv_set(dev, platform_get_drvdata(m4updev)); } - ret = iommu_fwspec_add_ids(dev, args->args, 1); - if (ret) - return ret; - - data = dev_iommu_priv_get(dev); - mtk_mapping = data->mapping; - if (!mtk_mapping) { - /* MTK iommu support 4GB iova address space. */ - mtk_mapping = arm_iommu_create_mapping(&platform_bus_type, - 0, 1ULL << 32); - if (IS_ERR(mtk_mapping)) - return PTR_ERR(mtk_mapping); - - data->mapping = mtk_mapping; - } - - return 0; -} - -static int mtk_iommu_def_domain_type(struct device *dev) -{ - return IOMMU_DOMAIN_UNMANAGED; -} - -static struct iommu_device *mtk_iommu_probe_device(struct device *dev) -{ - struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); - struct of_phandle_args iommu_spec; - struct of_phandle_iterator it; - struct mtk_iommu_data *data; - int err; - - of_for_each_phandle(&it, err, dev->of_node, "iommus", - "#iommu-cells", -1) { - int count = of_phandle_iterator_args(&it, iommu_spec.args, - MAX_PHANDLE_ARGS); - iommu_spec.np = of_node_get(it.node); - iommu_spec.args_count = count; - - mtk_iommu_create_mapping(dev, &iommu_spec); - - /* dev->iommu_fwspec might have changed */ - fwspec = dev_iommu_fwspec_get(dev); - - of_node_put(iommu_spec.np); - } - - if (!fwspec || fwspec->ops != &mtk_iommu_ops) - return ERR_PTR(-ENODEV); /* Not a iommu client device */ - - data = dev_iommu_priv_get(dev); - - return &data->iommu; -} - -static void mtk_iommu_probe_finalize(struct device *dev) -{ - struct dma_iommu_mapping *mtk_mapping; - struct mtk_iommu_data *data; - int err; - - data = dev_iommu_priv_get(dev); - mtk_mapping = data->mapping; - - err = arm_iommu_attach_device(dev, mtk_mapping); - if (err) - dev_err(dev, "Can't create IOMMU mapping - DMA-OPS will not work\n"); -} - -static void mtk_iommu_release_device(struct device *dev) -{ - struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); - - if (!fwspec || fwspec->ops != &mtk_iommu_ops) - return; - - iommu_fwspec_free(dev); + return iommu_fwspec_add_ids(dev, args->args, 1); } static int mtk_iommu_hw_init(const struct mtk_iommu_data *data) @@ -524,10 +459,9 @@ static const struct iommu_ops mtk_iommu_ops = { .unmap = mtk_iommu_unmap, .iova_to_phys = mtk_iommu_iova_to_phys, .probe_device = mtk_iommu_probe_device, - .probe_finalize = mtk_iommu_probe_finalize, .release_device = mtk_iommu_release_device, - .def_domain_type = mtk_iommu_def_domain_type, - .device_group = generic_device_group, + .device_group = mtk_iommu_device_group, + .of_xlate = mtk_iommu_of_xlate, .pgsize_bitmap = ~0UL << MT2701_IOMMU_PAGE_SHIFT, }; @@ -626,6 +560,14 @@ static int mtk_iommu_probe(struct platform_device *pdev) if (ret) return ret; + /* + * MTK generation one iommu HW only support one iommu domain, + * and all the client sharing the same iova address space. + */ + data->m4u_group = iommu_group_alloc(); + if (IS_ERR(data->m4u_group)) + return PTR_ERR(data->m4u_group); + if (!iommu_present(&platform_bus_type)) bus_set_iommu(&platform_bus_type, &mtk_iommu_ops); @@ -636,6 +578,7 @@ static int mtk_iommu_remove(struct platform_device *pdev) { struct mtk_iommu_data *data = platform_get_drvdata(pdev); + iommu_group_put(data->m4u_group); iommu_device_sysfs_remove(&data->iommu); iommu_device_unregister(&data->iommu);