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Wed, 13 Sep 2023 13:44:14 +0000 Received: from LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::faf:4cd0:ae27:1073]) by LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::faf:4cd0:ae27:1073%6]) with mapi id 15.20.6768.036; Wed, 13 Sep 2023 13:44:14 +0000 From: Jason Gunthorpe To: Andy Gross , Alim Akhtar , Bjorn Andersson , AngeloGioacchino Del Regno , Baolin Wang , Christophe Leroy , Gerald Schaefer , Heiko Stuebner , iommu@lists.linux.dev, Jernej Skrabec , Jonathan Hunter , Joerg Roedel , Kevin Tian , Konrad Dybcio , Krzysztof Kozlowski , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-s390@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, Russell King , linuxppc-dev@lists.ozlabs.org, Matthias Brugger , Matthew Rosato , Michael Ellerman , Nicholas Piggin , Orson Zhai , Rob Clark , Robin Murphy , Samuel Holland , Thierry Reding , Krishna Reddy , Chen-Yu Tsai , Will Deacon , Yong Wu , Chunyan Zhang Cc: Lu Baolu , Dmitry Osipenko , Jerry Snitselaar , Marek Szyprowski , Nicolin Chen , Niklas Schnelle , Steven Price , Thierry Reding Subject: [PATCH v8 10/24] iommu/exynos: Implement an IDENTITY domain Date: Wed, 13 Sep 2023 10:43:43 -0300 Message-ID: <10-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com> In-Reply-To: <0-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com> References: X-ClientProxiedBy: MN2PR03CA0016.namprd03.prod.outlook.com (2603:10b6:208:23a::21) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|SJ2PR12MB7848:EE_ X-MS-Office365-Filtering-Correlation-Id: 6af68854-b084-4614-e0aa-08dbb45f83c8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6af68854-b084-4614-e0aa-08dbb45f83c8 X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Sep 2023 13:44:13.0480 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: yxU78Db4KFIhulG3du0eSwDBq/FpVVfUEGcb9O779M5QOvqvGQcC+hTQgEjLnp2x X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB7848 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org What exynos calls exynos_iommu_detach_device is actually putting the iommu into identity mode. Move to the new core support for ARM_DMA_USE_IOMMU by defining ops->identity_domain. Tested-by: Marek Szyprowski Acked-by: Marek Szyprowski Reviewed-by: Jerry Snitselaar Signed-off-by: Jason Gunthorpe --- drivers/iommu/exynos-iommu.c | 66 +++++++++++++++++------------------- 1 file changed, 32 insertions(+), 34 deletions(-) diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index c275fe71c4db32..5e12b85dfe8705 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -24,6 +24,7 @@ typedef u32 sysmmu_iova_t; typedef u32 sysmmu_pte_t; +static struct iommu_domain exynos_identity_domain; /* We do not consider super section mapping (16MB) */ #define SECT_ORDER 20 @@ -829,7 +830,7 @@ static int __maybe_unused exynos_sysmmu_suspend(struct device *dev) struct exynos_iommu_owner *owner = dev_iommu_priv_get(master); mutex_lock(&owner->rpm_lock); - if (data->domain) { + if (&data->domain->domain != &exynos_identity_domain) { dev_dbg(data->sysmmu, "saving state\n"); __sysmmu_disable(data); } @@ -847,7 +848,7 @@ static int __maybe_unused exynos_sysmmu_resume(struct device *dev) struct exynos_iommu_owner *owner = dev_iommu_priv_get(master); mutex_lock(&owner->rpm_lock); - if (data->domain) { + if (&data->domain->domain != &exynos_identity_domain) { dev_dbg(data->sysmmu, "restoring state\n"); __sysmmu_enable(data); } @@ -980,17 +981,20 @@ static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain) kfree(domain); } -static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain, - struct device *dev) +static int exynos_iommu_identity_attach(struct iommu_domain *identity_domain, + struct device *dev) { - struct exynos_iommu_domain *domain = to_exynos_domain(iommu_domain); struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev); - phys_addr_t pagetable = virt_to_phys(domain->pgtable); + struct exynos_iommu_domain *domain; + phys_addr_t pagetable; struct sysmmu_drvdata *data, *next; unsigned long flags; - if (!has_sysmmu(dev) || owner->domain != iommu_domain) - return; + if (owner->domain == identity_domain) + return 0; + + domain = to_exynos_domain(owner->domain); + pagetable = virt_to_phys(domain->pgtable); mutex_lock(&owner->rpm_lock); @@ -1009,15 +1013,25 @@ static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain, list_del_init(&data->domain_node); spin_unlock(&data->lock); } - owner->domain = NULL; + owner->domain = identity_domain; spin_unlock_irqrestore(&domain->lock, flags); mutex_unlock(&owner->rpm_lock); - dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n", __func__, - &pagetable); + dev_dbg(dev, "%s: Restored IOMMU to IDENTITY from pgtable %pa\n", + __func__, &pagetable); + return 0; } +static struct iommu_domain_ops exynos_identity_ops = { + .attach_dev = exynos_iommu_identity_attach, +}; + +static struct iommu_domain exynos_identity_domain = { + .type = IOMMU_DOMAIN_IDENTITY, + .ops = &exynos_identity_ops, +}; + static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain, struct device *dev) { @@ -1026,12 +1040,11 @@ static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain, struct sysmmu_drvdata *data; phys_addr_t pagetable = virt_to_phys(domain->pgtable); unsigned long flags; + int err; - if (!has_sysmmu(dev)) - return -ENODEV; - - if (owner->domain) - exynos_iommu_detach_device(owner->domain, dev); + err = exynos_iommu_identity_attach(&exynos_identity_domain, dev); + if (err) + return err; mutex_lock(&owner->rpm_lock); @@ -1407,26 +1420,12 @@ static struct iommu_device *exynos_iommu_probe_device(struct device *dev) return &data->iommu; } -static void exynos_iommu_set_platform_dma(struct device *dev) -{ - struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev); - - if (owner->domain) { - struct iommu_group *group = iommu_group_get(dev); - - if (group) { - exynos_iommu_detach_device(owner->domain, dev); - iommu_group_put(group); - } - } -} - static void exynos_iommu_release_device(struct device *dev) { struct exynos_iommu_owner *owner = dev_iommu_priv_get(dev); struct sysmmu_drvdata *data; - exynos_iommu_set_platform_dma(dev); + WARN_ON(exynos_iommu_identity_attach(&exynos_identity_domain, dev)); list_for_each_entry(data, &owner->controllers, owner_node) device_link_del(data->link); @@ -1457,6 +1456,7 @@ static int exynos_iommu_of_xlate(struct device *dev, INIT_LIST_HEAD(&owner->controllers); mutex_init(&owner->rpm_lock); + owner->domain = &exynos_identity_domain; dev_iommu_priv_set(dev, owner); } @@ -1471,11 +1471,9 @@ static int exynos_iommu_of_xlate(struct device *dev, } static const struct iommu_ops exynos_iommu_ops = { + .identity_domain = &exynos_identity_domain, .domain_alloc = exynos_iommu_domain_alloc, .device_group = generic_device_group, -#ifdef CONFIG_ARM - .set_platform_dma_ops = exynos_iommu_set_platform_dma, -#endif .probe_device = exynos_iommu_probe_device, .release_device = exynos_iommu_release_device, .pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,