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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: 59c0dfd8-a309-439e-587e-08db55a0a240 X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 May 2023 00:01:01.0706 (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: ZcVfuHD93oWT0U3gGqc/M45SkB/rZthRdAXpFtl9zxOz5Q4qXR5qctm9G9TdZ3qr X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6786 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230515_170116_537321_2CFB3D00 X-CRM114-Status: GOOD ( 15.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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. Signed-off-by: Jason Gunthorpe Acked-by: Marek Szyprowski --- 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,