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Tue, 3 Dec 2024 14:10:33 -0800 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , , , , Subject: [PATCH v2 01/13] iommufd/fault: Add an iommufd_fault_init() helper Date: Tue, 3 Dec 2024 14:10:06 -0800 Message-ID: <3bc49512a42b88130cf447a7ac10acf5c02e056c.1733263737.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000F0E2:EE_|SJ2PR12MB9162:EE_ X-MS-Office365-Filtering-Correlation-Id: 35fa567a-d783-4cc8-ffe9-08dd13e75a7c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|82310400026|7416014|376014; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(36860700013)(82310400026)(7416014)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Dec 2024 22:10:53.1117 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 35fa567a-d783-4cc8-ffe9-08dd13e75a7c X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000F0E2.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB9162 A fault object will be renamed and shared with a new vIRQ object in one of the following changes. Add a helper for the new allocator to call it too. Reorder the iommufd_ctx_get and refcount_inc to keep them symmetrical with the iommufd_fault_fops_release(). Since the new vIRQ object doesn't need "response", leave the xa_init_flags in its original location. Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/fault.c | 48 ++++++++++++++++++++--------------- 1 file changed, 28 insertions(+), 20 deletions(-) diff --git a/drivers/iommu/iommufd/fault.c b/drivers/iommu/iommufd/fault.c index 1fe804e28a86..87c811b9c0d0 100644 --- a/drivers/iommu/iommufd/fault.c +++ b/drivers/iommu/iommufd/fault.c @@ -367,11 +367,35 @@ static const struct file_operations iommufd_fault_fops = { .release = iommufd_fault_fops_release, }; +static int iommufd_fault_init(struct iommufd_fault *fault, char *name, + struct iommufd_ctx *ictx) +{ + struct file *filep; + int fdno; + + fault->ictx = ictx; + mutex_init(&fault->mutex); + INIT_LIST_HEAD(&fault->deliver); + init_waitqueue_head(&fault->wait_queue); + + filep = anon_inode_getfile(name, &iommufd_fault_fops, fault, O_RDWR); + if (IS_ERR(filep)) + return PTR_ERR(filep); + + fault->filep = filep; + iommufd_ctx_get(fault->ictx); + refcount_inc(&fault->obj.users); + + fdno = get_unused_fd_flags(O_CLOEXEC); + if (fdno < 0) + fput(filep); + return fdno; +} + int iommufd_fault_alloc(struct iommufd_ucmd *ucmd) { struct iommu_fault_alloc *cmd = ucmd->cmd; struct iommufd_fault *fault; - struct file *filep; int fdno; int rc; @@ -382,27 +406,12 @@ int iommufd_fault_alloc(struct iommufd_ucmd *ucmd) if (IS_ERR(fault)) return PTR_ERR(fault); - fault->ictx = ucmd->ictx; - INIT_LIST_HEAD(&fault->deliver); xa_init_flags(&fault->response, XA_FLAGS_ALLOC1); - mutex_init(&fault->mutex); - init_waitqueue_head(&fault->wait_queue); - - filep = anon_inode_getfile("[iommufd-pgfault]", &iommufd_fault_fops, - fault, O_RDWR); - if (IS_ERR(filep)) { - rc = PTR_ERR(filep); - goto out_abort; - } - refcount_inc(&fault->obj.users); - iommufd_ctx_get(fault->ictx); - fault->filep = filep; - - fdno = get_unused_fd_flags(O_CLOEXEC); + fdno = iommufd_fault_init(fault, "[iommufd-pgfault]", ucmd->ictx); if (fdno < 0) { rc = fdno; - goto out_fput; + goto out_abort; } cmd->out_fault_id = fault->obj.id; @@ -418,8 +427,7 @@ int iommufd_fault_alloc(struct iommufd_ucmd *ucmd) return 0; out_put_fdno: put_unused_fd(fdno); -out_fput: - fput(filep); + fput(fault->filep); out_abort: iommufd_object_abort_and_destroy(ucmd->ictx, &fault->obj); From patchwork Tue Dec 3 22:10:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 13893020 Received: from NAM12-DM6-obe.outbound.protection.outlook.com (mail-dm6nam12on2077.outbound.protection.outlook.com [40.107.243.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 39C051DF27E; Tue, 3 Dec 2024 22:10:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.243.77 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733263861; cv=fail; b=GgWRjhjz9aMB86K1dbimmIas7V3os2wsjM5e2SdbOtUzDyZJdf2UoVrGqymTlP/JTBb7EXqvFzLobZ5eDx/JqzwaopEVIEU+v9GpEDn6KRcct1ALwoKK+iAaAD8EPRnnba2I7ePcGWTZKmIW7DCGxXg/NSJvXAR+cstDGZcTPWQ= ARC-Message-Signature: i=2; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Dec 2024 22:10:54.5180 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bd23e13f-549a-4f2c-94ab-08dd13e75b53 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000F0E2.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR12MB6369 The new vIRQ object will need a similar function for drivers to report the vIOMMU related interrupts. Split the common part out to a smaller helper, and place it in the header so that CONFIG_IOMMUFD_DRIVER_CORE can include that in the driver.c file for drivers to use. Then keep iommufd_fault_iopf_handler() in the header too, since it's quite simple after all. Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/iommufd_private.h | 20 +++++++++++++++++++- drivers/iommu/iommufd/fault.c | 17 ----------------- 2 files changed, 19 insertions(+), 18 deletions(-) diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index b6d706cf2c66..8b378705ee71 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -451,6 +451,17 @@ struct iommufd_fault { struct wait_queue_head wait_queue; }; +static inline int iommufd_fault_notify(struct iommufd_fault *fault, + struct list_head *new_fault) +{ + mutex_lock(&fault->mutex); + list_add_tail(new_fault, &fault->deliver); + mutex_unlock(&fault->mutex); + + wake_up_interruptible(&fault->wait_queue); + return 0; +} + struct iommufd_attach_handle { struct iommu_attach_handle handle; struct iommufd_device *idev; @@ -469,7 +480,14 @@ iommufd_get_fault(struct iommufd_ucmd *ucmd, u32 id) int iommufd_fault_alloc(struct iommufd_ucmd *ucmd); void iommufd_fault_destroy(struct iommufd_object *obj); -int iommufd_fault_iopf_handler(struct iopf_group *group); + +static inline int iommufd_fault_iopf_handler(struct iopf_group *group) +{ + struct iommufd_hw_pagetable *hwpt = + group->attach_handle->domain->fault_data; + + return iommufd_fault_notify(hwpt->fault, &group->node); +} int iommufd_fault_domain_attach_dev(struct iommufd_hw_pagetable *hwpt, struct iommufd_device *idev); diff --git a/drivers/iommu/iommufd/fault.c b/drivers/iommu/iommufd/fault.c index 87c811b9c0d0..5694b04a48bd 100644 --- a/drivers/iommu/iommufd/fault.c +++ b/drivers/iommu/iommufd/fault.c @@ -433,20 +433,3 @@ int iommufd_fault_alloc(struct iommufd_ucmd *ucmd) return rc; } - -int iommufd_fault_iopf_handler(struct iopf_group *group) -{ - struct iommufd_hw_pagetable *hwpt; - struct iommufd_fault *fault; - - hwpt = group->attach_handle->domain->fault_data; - fault = hwpt->fault; - - mutex_lock(&fault->mutex); - list_add_tail(&group->node, &fault->deliver); - mutex_unlock(&fault->mutex); 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Dec 2024 22:10:57.0212 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d972f7db-97e6-4da3-4e57-08dd13e75cb7 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002324.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB7506 The fault object was designed exclusively for hwpt's IO page faults (PRI). But its implementation can actually be reused for other purposes too, such as hardware IRQ and event injections to user space. Meanwhile, a fault object holds a list of faults. So it's more accurate to call it a "fault queue". Combining the reusing idea above, a "fault queue" can further rephrase to an "Event Queue for IOPF". Rename the struct iommufd_fault to struct iommufd_eventq_iopf that holds a common Event Queue struct, similar to hwpt_paging holding a common hwpt. Roll out a minimal level of renamings to all the related functions. Add a common iommufd_eventq_ops and iommufd_eventq_init to prepare for an IOMMUFD_OBJ_EVENTQ_VIRQ. Also, add missing xa_destroy and mutex_destroy in iommufd_fault_destroy(). Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/iommufd_private.h | 87 ++++++---- include/linux/iommufd.h | 2 +- drivers/iommu/iommufd/fault.c | 221 ++++++++++++++---------- drivers/iommu/iommufd/hw_pagetable.c | 12 +- drivers/iommu/iommufd/main.c | 8 +- 5 files changed, 195 insertions(+), 135 deletions(-) diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 8b378705ee71..1c9a101cc435 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -18,6 +18,8 @@ struct iommu_domain; struct iommu_group; struct iommu_option; struct iommufd_device; +struct iommufd_eventq; +struct iommufd_eventq_iopf; struct iommufd_ctx { struct file *file; @@ -275,7 +277,7 @@ int iommufd_check_iova_range(struct io_pagetable *iopt, struct iommufd_hw_pagetable { struct iommufd_object obj; struct iommu_domain *domain; - struct iommufd_fault *fault; + struct iommufd_eventq_iopf *fault; }; struct iommufd_hwpt_paging { @@ -433,32 +435,35 @@ void iopt_remove_access(struct io_pagetable *iopt, u32 iopt_access_list_id); void iommufd_access_destroy_object(struct iommufd_object *obj); -/* - * An iommufd_fault object represents an interface to deliver I/O page faults - * to the user space. These objects are created/destroyed by the user space and - * associated with hardware page table objects during page-table allocation. - */ -struct iommufd_fault { +struct iommufd_eventq_ops { + ssize_t (*read)(struct iommufd_eventq *eventq, char __user *buf, + size_t count, loff_t *ppos); + ssize_t (*write)(struct iommufd_eventq *eventq, const char __user *buf, + size_t count, loff_t *ppos); +}; + +struct iommufd_eventq { struct iommufd_object obj; struct iommufd_ctx *ictx; struct file *filep; - /* The lists of outstanding faults protected by below mutex. */ + const struct iommufd_eventq_ops *ops; + + /* The lists of outstanding events protected by below mutex. */ struct mutex mutex; struct list_head deliver; - struct xarray response; struct wait_queue_head wait_queue; }; -static inline int iommufd_fault_notify(struct iommufd_fault *fault, - struct list_head *new_fault) +static inline int iommufd_eventq_notify(struct iommufd_eventq *eventq, + struct list_head *new_event) { - mutex_lock(&fault->mutex); - list_add_tail(new_fault, &fault->deliver); - mutex_unlock(&fault->mutex); + mutex_lock(&eventq->mutex); + list_add_tail(new_event, &eventq->deliver); + mutex_unlock(&eventq->mutex); - wake_up_interruptible(&fault->wait_queue); + wake_up_interruptible(&eventq->wait_queue); return 0; } @@ -470,38 +475,54 @@ struct iommufd_attach_handle { /* Convert an iommu attach handle to iommufd handle. */ #define to_iommufd_handle(hdl) container_of(hdl, struct iommufd_attach_handle, handle) -static inline struct iommufd_fault * -iommufd_get_fault(struct iommufd_ucmd *ucmd, u32 id) +/* + * An iommufd_eventq_iopf object represents a queue to deliver I/O page faults + * to the user space. These objects are created/destroyed by the user space and + * associated with hardware page table objects during page-table allocation. + */ +struct iommufd_eventq_iopf { + struct iommufd_eventq common; + struct xarray response; +}; + +static inline struct iommufd_eventq_iopf * +to_eventq_iopf(struct iommufd_eventq *eventq) +{ + return container_of(eventq, struct iommufd_eventq_iopf, common); +} + +static inline struct iommufd_eventq_iopf * +iommufd_get_eventq_iopf(struct iommufd_ucmd *ucmd, u32 id) { return container_of(iommufd_get_object(ucmd->ictx, id, - IOMMUFD_OBJ_FAULT), - struct iommufd_fault, obj); + IOMMUFD_OBJ_EVENTQ_IOPF), + struct iommufd_eventq_iopf, common.obj); } -int iommufd_fault_alloc(struct iommufd_ucmd *ucmd); -void iommufd_fault_destroy(struct iommufd_object *obj); +int iommufd_eventq_iopf_alloc(struct iommufd_ucmd *ucmd); +void iommufd_eventq_iopf_destroy(struct iommufd_object *obj); -static inline int iommufd_fault_iopf_handler(struct iopf_group *group) +static inline int iommufd_eventq_iopf_handler(struct iopf_group *group) { struct iommufd_hw_pagetable *hwpt = group->attach_handle->domain->fault_data; - return iommufd_fault_notify(hwpt->fault, &group->node); + return iommufd_eventq_notify(&hwpt->fault->common, &group->node); } -int iommufd_fault_domain_attach_dev(struct iommufd_hw_pagetable *hwpt, - struct iommufd_device *idev); -void iommufd_fault_domain_detach_dev(struct iommufd_hw_pagetable *hwpt, - struct iommufd_device *idev); -int iommufd_fault_domain_replace_dev(struct iommufd_device *idev, - struct iommufd_hw_pagetable *hwpt, - struct iommufd_hw_pagetable *old); +int iommufd_eventq_iopf_domain_attach_dev(struct iommufd_hw_pagetable *hwpt, + struct iommufd_device *idev); +void iommufd_eventq_iopf_domain_detach_dev(struct iommufd_hw_pagetable *hwpt, + struct iommufd_device *idev); +int iommufd_eventq_iopf_domain_replace_dev(struct iommufd_device *idev, + struct iommufd_hw_pagetable *hwpt, + struct iommufd_hw_pagetable *old); static inline int iommufd_hwpt_attach_device(struct iommufd_hw_pagetable *hwpt, struct iommufd_device *idev) { if (hwpt->fault) - return iommufd_fault_domain_attach_dev(hwpt, idev); + return iommufd_eventq_iopf_domain_attach_dev(hwpt, idev); return iommu_attach_group(hwpt->domain, idev->igroup->group); } @@ -510,7 +531,7 @@ static inline void iommufd_hwpt_detach_device(struct iommufd_hw_pagetable *hwpt, struct iommufd_device *idev) { if (hwpt->fault) { - iommufd_fault_domain_detach_dev(hwpt, idev); + iommufd_eventq_iopf_domain_detach_dev(hwpt, idev); return; } @@ -522,7 +543,7 @@ static inline int iommufd_hwpt_replace_device(struct iommufd_device *idev, struct iommufd_hw_pagetable *old) { if (old->fault || hwpt->fault) - return iommufd_fault_domain_replace_dev(idev, hwpt, old); + return iommufd_eventq_iopf_domain_replace_dev(idev, hwpt, old); return iommu_group_replace_domain(idev->igroup->group, hwpt->domain); } diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 11110c749200..7ad105ab8090 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -31,7 +31,7 @@ enum iommufd_object_type { IOMMUFD_OBJ_HWPT_NESTED, IOMMUFD_OBJ_IOAS, IOMMUFD_OBJ_ACCESS, - IOMMUFD_OBJ_FAULT, + IOMMUFD_OBJ_EVENTQ_IOPF, IOMMUFD_OBJ_VIOMMU, IOMMUFD_OBJ_VDEVICE, #ifdef CONFIG_IOMMUFD_TEST diff --git a/drivers/iommu/iommufd/fault.c b/drivers/iommu/iommufd/fault.c index 5694b04a48bd..3674961a45c2 100644 --- a/drivers/iommu/iommufd/fault.c +++ b/drivers/iommu/iommufd/fault.c @@ -17,7 +17,9 @@ #include "../iommu-priv.h" #include "iommufd_private.h" -static int iommufd_fault_iopf_enable(struct iommufd_device *idev) +/* IOMMUFD_OBJ_EVENTQ_IOPF Functions */ + +static int iommufd_eventq_iopf_enable(struct iommufd_device *idev) { struct device *dev = idev->dev; int ret; @@ -50,7 +52,7 @@ static int iommufd_fault_iopf_enable(struct iommufd_device *idev) return ret; } -static void iommufd_fault_iopf_disable(struct iommufd_device *idev) +static void iommufd_eventq_iopf_disable(struct iommufd_device *idev) { mutex_lock(&idev->iopf_lock); if (!WARN_ON(idev->iopf_enabled == 0)) { @@ -60,8 +62,8 @@ static void iommufd_fault_iopf_disable(struct iommufd_device *idev) mutex_unlock(&idev->iopf_lock); } -static int __fault_domain_attach_dev(struct iommufd_hw_pagetable *hwpt, - struct iommufd_device *idev) +static int __eventq_iopf_domain_attach_dev(struct iommufd_hw_pagetable *hwpt, + struct iommufd_device *idev) { struct iommufd_attach_handle *handle; int ret; @@ -79,37 +81,38 @@ static int __fault_domain_attach_dev(struct iommufd_hw_pagetable *hwpt, return ret; } -int iommufd_fault_domain_attach_dev(struct iommufd_hw_pagetable *hwpt, - struct iommufd_device *idev) +int iommufd_eventq_iopf_domain_attach_dev(struct iommufd_hw_pagetable *hwpt, + struct iommufd_device *idev) { int ret; if (!hwpt->fault) return -EINVAL; - ret = iommufd_fault_iopf_enable(idev); + ret = iommufd_eventq_iopf_enable(idev); if (ret) return ret; - ret = __fault_domain_attach_dev(hwpt, idev); + ret = __eventq_iopf_domain_attach_dev(hwpt, idev); if (ret) - iommufd_fault_iopf_disable(idev); + iommufd_eventq_iopf_disable(idev); return ret; } -static void iommufd_auto_response_faults(struct iommufd_hw_pagetable *hwpt, - struct iommufd_attach_handle *handle) +static void +iommufd_eventq_iopf_auto_response(struct iommufd_hw_pagetable *hwpt, + struct iommufd_attach_handle *handle) { - struct iommufd_fault *fault = hwpt->fault; + struct iommufd_eventq_iopf *fault = hwpt->fault; struct iopf_group *group, *next; unsigned long index; if (!fault) return; - mutex_lock(&fault->mutex); - list_for_each_entry_safe(group, next, &fault->deliver, node) { + mutex_lock(&fault->common.mutex); + list_for_each_entry_safe(group, next, &fault->common.deliver, node) { if (group->attach_handle != &handle->handle) continue; list_del(&group->node); @@ -124,7 +127,7 @@ static void iommufd_auto_response_faults(struct iommufd_hw_pagetable *hwpt, iopf_group_response(group, IOMMU_PAGE_RESP_INVALID); iopf_free_group(group); } - mutex_unlock(&fault->mutex); + mutex_unlock(&fault->common.mutex); } static struct iommufd_attach_handle * @@ -139,21 +142,21 @@ iommufd_device_get_attach_handle(struct iommufd_device *idev) return to_iommufd_handle(handle); } -void iommufd_fault_domain_detach_dev(struct iommufd_hw_pagetable *hwpt, - struct iommufd_device *idev) +void iommufd_eventq_iopf_domain_detach_dev(struct iommufd_hw_pagetable *hwpt, + struct iommufd_device *idev) { struct iommufd_attach_handle *handle; handle = iommufd_device_get_attach_handle(idev); iommu_detach_group_handle(hwpt->domain, idev->igroup->group); - iommufd_auto_response_faults(hwpt, handle); - iommufd_fault_iopf_disable(idev); + iommufd_eventq_iopf_auto_response(hwpt, handle); + iommufd_eventq_iopf_disable(idev); kfree(handle); } -static int __fault_domain_replace_dev(struct iommufd_device *idev, - struct iommufd_hw_pagetable *hwpt, - struct iommufd_hw_pagetable *old) +static int __eventq_iopf_domain_replace_dev(struct iommufd_device *idev, + struct iommufd_hw_pagetable *hwpt, + struct iommufd_hw_pagetable *old) { struct iommufd_attach_handle *handle, *curr = NULL; int ret; @@ -175,43 +178,44 @@ static int __fault_domain_replace_dev(struct iommufd_device *idev, } if (!ret && curr) { - iommufd_auto_response_faults(old, curr); + iommufd_eventq_iopf_auto_response(old, curr); kfree(curr); } return ret; } -int iommufd_fault_domain_replace_dev(struct iommufd_device *idev, - struct iommufd_hw_pagetable *hwpt, - struct iommufd_hw_pagetable *old) +int iommufd_eventq_iopf_domain_replace_dev(struct iommufd_device *idev, + struct iommufd_hw_pagetable *hwpt, + struct iommufd_hw_pagetable *old) { bool iopf_off = !hwpt->fault && old->fault; bool iopf_on = hwpt->fault && !old->fault; int ret; if (iopf_on) { - ret = iommufd_fault_iopf_enable(idev); + ret = iommufd_eventq_iopf_enable(idev); if (ret) return ret; } - ret = __fault_domain_replace_dev(idev, hwpt, old); + ret = __eventq_iopf_domain_replace_dev(idev, hwpt, old); if (ret) { if (iopf_on) - iommufd_fault_iopf_disable(idev); + iommufd_eventq_iopf_disable(idev); return ret; } if (iopf_off) - iommufd_fault_iopf_disable(idev); + iommufd_eventq_iopf_disable(idev); return 0; } -void iommufd_fault_destroy(struct iommufd_object *obj) +void iommufd_eventq_iopf_destroy(struct iommufd_object *obj) { - struct iommufd_fault *fault = container_of(obj, struct iommufd_fault, obj); + struct iommufd_eventq *eventq = + container_of(obj, struct iommufd_eventq, obj); struct iopf_group *group, *next; /* @@ -220,17 +224,19 @@ void iommufd_fault_destroy(struct iommufd_object *obj) * accessing this pointer. Therefore, acquiring the mutex here * is unnecessary. */ - list_for_each_entry_safe(group, next, &fault->deliver, node) { + list_for_each_entry_safe(group, next, &eventq->deliver, node) { list_del(&group->node); iopf_group_response(group, IOMMU_PAGE_RESP_INVALID); iopf_free_group(group); } + xa_destroy(&to_eventq_iopf(eventq)->response); + mutex_destroy(&eventq->mutex); } -static void iommufd_compose_fault_message(struct iommu_fault *fault, - struct iommu_hwpt_pgfault *hwpt_fault, - struct iommufd_device *idev, - u32 cookie) +static void iommufd_compose_iopf_message(struct iommu_fault *fault, + struct iommu_hwpt_pgfault *hwpt_fault, + struct iommufd_device *idev, + u32 cookie) { hwpt_fault->flags = fault->prm.flags; hwpt_fault->dev_id = idev->obj.id; @@ -242,11 +248,12 @@ static void iommufd_compose_fault_message(struct iommu_fault *fault, hwpt_fault->cookie = cookie; } -static ssize_t iommufd_fault_fops_read(struct file *filep, char __user *buf, - size_t count, loff_t *ppos) +static ssize_t iommufd_eventq_iopf_fops_read(struct iommufd_eventq *eventq, + char __user *buf, size_t count, + loff_t *ppos) { + struct iommufd_eventq_iopf *fault = to_eventq_iopf(eventq); size_t fault_size = sizeof(struct iommu_hwpt_pgfault); - struct iommufd_fault *fault = filep->private_data; struct iommu_hwpt_pgfault data; struct iommufd_device *idev; struct iopf_group *group; @@ -257,10 +264,10 @@ static ssize_t iommufd_fault_fops_read(struct file *filep, char __user *buf, if (*ppos || count % fault_size) return -ESPIPE; - mutex_lock(&fault->mutex); - while (!list_empty(&fault->deliver) && count > done) { - group = list_first_entry(&fault->deliver, - struct iopf_group, node); + mutex_lock(&eventq->mutex); + while (!list_empty(&eventq->deliver) && count > done) { + group = list_first_entry(&eventq->deliver, struct iopf_group, + node); if (group->fault_count * fault_size > count - done) break; @@ -272,9 +279,8 @@ static ssize_t iommufd_fault_fops_read(struct file *filep, char __user *buf, idev = to_iommufd_handle(group->attach_handle)->idev; list_for_each_entry(iopf, &group->faults, list) { - iommufd_compose_fault_message(&iopf->fault, - &data, idev, - group->cookie); + iommufd_compose_iopf_message(&iopf->fault, &data, idev, + group->cookie); if (copy_to_user(buf + done, &data, fault_size)) { xa_erase(&fault->response, group->cookie); rc = -EFAULT; @@ -285,16 +291,17 @@ static ssize_t iommufd_fault_fops_read(struct file *filep, char __user *buf, list_del(&group->node); } - mutex_unlock(&fault->mutex); + mutex_unlock(&eventq->mutex); return done == 0 ? rc : done; } -static ssize_t iommufd_fault_fops_write(struct file *filep, const char __user *buf, - size_t count, loff_t *ppos) +static ssize_t iommufd_eventq_iopf_fops_write(struct iommufd_eventq *eventq, + const char __user *buf, + size_t count, loff_t *ppos) { size_t response_size = sizeof(struct iommu_hwpt_page_response); - struct iommufd_fault *fault = filep->private_data; + struct iommufd_eventq_iopf *fault = to_eventq_iopf(eventq); struct iommu_hwpt_page_response response; struct iopf_group *group; size_t done = 0; @@ -303,7 +310,7 @@ static ssize_t iommufd_fault_fops_write(struct file *filep, const char __user *b if (*ppos || count % response_size) return -ESPIPE; - mutex_lock(&fault->mutex); + mutex_lock(&eventq->mutex); while (count > done) { rc = copy_from_user(&response, buf + done, response_size); if (rc) @@ -329,62 +336,92 @@ static ssize_t iommufd_fault_fops_write(struct file *filep, const char __user *b iopf_free_group(group); done += response_size; } - mutex_unlock(&fault->mutex); + mutex_unlock(&eventq->mutex); return done == 0 ? rc : done; } -static __poll_t iommufd_fault_fops_poll(struct file *filep, - struct poll_table_struct *wait) +static const struct iommufd_eventq_ops iommufd_eventq_iopf_ops = { + .read = &iommufd_eventq_iopf_fops_read, + .write = &iommufd_eventq_iopf_fops_write, +}; + +/* Common Event Queue Functions */ + +static ssize_t iommufd_eventq_fops_read(struct file *filep, char __user *buf, + size_t count, loff_t *ppos) +{ + struct iommufd_eventq *eventq = filep->private_data; + + if (!eventq->ops || !eventq->ops->read) + return -EOPNOTSUPP; + return eventq->ops->read(eventq, buf, count, ppos); +} + +static ssize_t iommufd_eventq_fops_write(struct file *filep, + const char __user *buf, size_t count, + loff_t *ppos) +{ + struct iommufd_eventq *eventq = filep->private_data; + + if (!eventq->ops || !eventq->ops->write) + return -EOPNOTSUPP; + return eventq->ops->write(eventq, buf, count, ppos); +} + +static __poll_t iommufd_eventq_fops_poll(struct file *filep, + struct poll_table_struct *wait) { - struct iommufd_fault *fault = filep->private_data; + struct iommufd_eventq *eventq = filep->private_data; __poll_t pollflags = EPOLLOUT; - poll_wait(filep, &fault->wait_queue, wait); - mutex_lock(&fault->mutex); - if (!list_empty(&fault->deliver)) + poll_wait(filep, &eventq->wait_queue, wait); + mutex_lock(&eventq->mutex); + if (!list_empty(&eventq->deliver)) pollflags |= EPOLLIN | EPOLLRDNORM; - mutex_unlock(&fault->mutex); + mutex_unlock(&eventq->mutex); return pollflags; } -static int iommufd_fault_fops_release(struct inode *inode, struct file *filep) +static int iommufd_eventq_fops_release(struct inode *inode, struct file *filep) { - struct iommufd_fault *fault = filep->private_data; + struct iommufd_eventq *eventq = filep->private_data; - refcount_dec(&fault->obj.users); - iommufd_ctx_put(fault->ictx); + refcount_dec(&eventq->obj.users); + iommufd_ctx_put(eventq->ictx); return 0; } -static const struct file_operations iommufd_fault_fops = { +static const struct file_operations iommufd_eventq_fops = { .owner = THIS_MODULE, .open = nonseekable_open, - .read = iommufd_fault_fops_read, - .write = iommufd_fault_fops_write, - .poll = iommufd_fault_fops_poll, - .release = iommufd_fault_fops_release, + .read = iommufd_eventq_fops_read, + .write = iommufd_eventq_fops_write, + .poll = iommufd_eventq_fops_poll, + .release = iommufd_eventq_fops_release, }; -static int iommufd_fault_init(struct iommufd_fault *fault, char *name, - struct iommufd_ctx *ictx) +static int iommufd_eventq_init(struct iommufd_eventq *eventq, char *name, + struct iommufd_ctx *ictx, + const struct iommufd_eventq_ops *ops) { struct file *filep; int fdno; - fault->ictx = ictx; - mutex_init(&fault->mutex); - INIT_LIST_HEAD(&fault->deliver); - init_waitqueue_head(&fault->wait_queue); + eventq->ops = ops; + eventq->ictx = ictx; + mutex_init(&eventq->mutex); + INIT_LIST_HEAD(&eventq->deliver); + init_waitqueue_head(&eventq->wait_queue); - filep = anon_inode_getfile(name, &iommufd_fault_fops, fault, O_RDWR); + filep = anon_inode_getfile(name, &iommufd_eventq_fops, eventq, O_RDWR); if (IS_ERR(filep)) return PTR_ERR(filep); - fault->filep = filep; - iommufd_ctx_get(fault->ictx); - refcount_inc(&fault->obj.users); + eventq->filep = filep; + iommufd_ctx_get(eventq->ictx); + refcount_inc(&eventq->obj.users); fdno = get_unused_fd_flags(O_CLOEXEC); if (fdno < 0) @@ -392,44 +429,46 @@ static int iommufd_fault_init(struct iommufd_fault *fault, char *name, return fdno; } -int iommufd_fault_alloc(struct iommufd_ucmd *ucmd) +int iommufd_eventq_iopf_alloc(struct iommufd_ucmd *ucmd) { struct iommu_fault_alloc *cmd = ucmd->cmd; - struct iommufd_fault *fault; + struct iommufd_eventq_iopf *eventq_iopf; int fdno; int rc; if (cmd->flags) return -EOPNOTSUPP; - fault = iommufd_object_alloc(ucmd->ictx, fault, IOMMUFD_OBJ_FAULT); - if (IS_ERR(fault)) - return PTR_ERR(fault); + eventq_iopf = __iommufd_object_alloc( + ucmd->ictx, eventq_iopf, IOMMUFD_OBJ_EVENTQ_IOPF, common.obj); + if (IS_ERR(eventq_iopf)) + return PTR_ERR(eventq_iopf); - xa_init_flags(&fault->response, XA_FLAGS_ALLOC1); + xa_init_flags(&eventq_iopf->response, XA_FLAGS_ALLOC1); - fdno = iommufd_fault_init(fault, "[iommufd-pgfault]", ucmd->ictx); + fdno = iommufd_eventq_init(&eventq_iopf->common, "[iommufd-pgfault]", + ucmd->ictx, &iommufd_eventq_iopf_ops); if (fdno < 0) { rc = fdno; goto out_abort; } - cmd->out_fault_id = fault->obj.id; + cmd->out_fault_id = eventq_iopf->common.obj.id; cmd->out_fault_fd = fdno; rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd)); if (rc) goto out_put_fdno; - iommufd_object_finalize(ucmd->ictx, &fault->obj); + iommufd_object_finalize(ucmd->ictx, &eventq_iopf->common.obj); - fd_install(fdno, fault->filep); + fd_install(fdno, eventq_iopf->common.filep); return 0; out_put_fdno: put_unused_fd(fdno); - fput(fault->filep); + fput(eventq_iopf->common.filep); out_abort: - iommufd_object_abort_and_destroy(ucmd->ictx, &fault->obj); + iommufd_object_abort_and_destroy(ucmd->ictx, &eventq_iopf->common.obj); return rc; } diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c index ce03c3804651..a89d9018f96b 100644 --- a/drivers/iommu/iommufd/hw_pagetable.c +++ b/drivers/iommu/iommufd/hw_pagetable.c @@ -14,7 +14,7 @@ static void __iommufd_hwpt_destroy(struct iommufd_hw_pagetable *hwpt) iommu_domain_free(hwpt->domain); if (hwpt->fault) - refcount_dec(&hwpt->fault->obj.users); + refcount_dec(&hwpt->fault->common.obj.users); } void iommufd_hwpt_paging_destroy(struct iommufd_object *obj) @@ -393,18 +393,18 @@ int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd) } if (cmd->flags & IOMMU_HWPT_FAULT_ID_VALID) { - struct iommufd_fault *fault; + struct iommufd_eventq_iopf *fault; - fault = iommufd_get_fault(ucmd, cmd->fault_id); + fault = iommufd_get_eventq_iopf(ucmd, cmd->fault_id); if (IS_ERR(fault)) { rc = PTR_ERR(fault); goto out_hwpt; } hwpt->fault = fault; - hwpt->domain->iopf_handler = iommufd_fault_iopf_handler; + hwpt->domain->iopf_handler = iommufd_eventq_iopf_handler; hwpt->domain->fault_data = hwpt; - refcount_inc(&fault->obj.users); - iommufd_put_object(ucmd->ictx, &fault->obj); + refcount_inc(&fault->common.obj.users); + iommufd_put_object(ucmd->ictx, &fault->common.obj); } cmd->out_hwpt_id = hwpt->obj.id; diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c index 0a96cc8f27da..539c24ada6d0 100644 --- a/drivers/iommu/iommufd/main.c +++ b/drivers/iommu/iommufd/main.c @@ -333,8 +333,8 @@ struct iommufd_ioctl_op { } static const struct iommufd_ioctl_op iommufd_ioctl_ops[] = { IOCTL_OP(IOMMU_DESTROY, iommufd_destroy, struct iommu_destroy, id), - IOCTL_OP(IOMMU_FAULT_QUEUE_ALLOC, iommufd_fault_alloc, struct iommu_fault_alloc, - out_fault_fd), + IOCTL_OP(IOMMU_FAULT_QUEUE_ALLOC, iommufd_eventq_iopf_alloc, + struct iommu_fault_alloc, out_fault_fd), IOCTL_OP(IOMMU_GET_HW_INFO, iommufd_get_hw_info, struct iommu_hw_info, __reserved), IOCTL_OP(IOMMU_HWPT_ALLOC, iommufd_hwpt_alloc, struct iommu_hwpt_alloc, @@ -501,8 +501,8 @@ static const struct iommufd_object_ops iommufd_object_ops[] = { .destroy = iommufd_hwpt_nested_destroy, .abort = iommufd_hwpt_nested_abort, }, - [IOMMUFD_OBJ_FAULT] = { - .destroy = iommufd_fault_destroy, + [IOMMUFD_OBJ_EVENTQ_IOPF] = { + .destroy = iommufd_eventq_iopf_destroy, }, [IOMMUFD_OBJ_VIOMMU] = { .destroy = iommufd_viommu_destroy, From patchwork Tue Dec 3 22:10:09 2024 Content-Type: text/plain; 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Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/Makefile | 2 +- drivers/iommu/iommufd/{fault.c => eventq.c} | 0 2 files changed, 1 insertion(+), 1 deletion(-) rename drivers/iommu/iommufd/{fault.c => eventq.c} (100%) diff --git a/drivers/iommu/iommufd/Makefile b/drivers/iommu/iommufd/Makefile index cb784da6cddc..71d692c9a8f4 100644 --- a/drivers/iommu/iommufd/Makefile +++ b/drivers/iommu/iommufd/Makefile @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0-only iommufd-y := \ device.o \ - fault.o \ + eventq.o \ hw_pagetable.o \ io_pagetable.o \ ioas.o \ diff --git a/drivers/iommu/iommufd/fault.c b/drivers/iommu/iommufd/eventq.c similarity index 100% rename from drivers/iommu/iommufd/fault.c rename to drivers/iommu/iommufd/eventq.c From patchwork Tue Dec 3 22:10:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 13893022 Received: from NAM11-BN8-obe.outbound.protection.outlook.com (mail-bn8nam11on2048.outbound.protection.outlook.com [40.107.236.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1351720A5D4; 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Add iommufd_eventq_virq_alloc with an iommufd_eventq_virq_ops for this new ioctl. Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/iommufd_private.h | 59 ++++++++++ include/linux/iommufd.h | 3 + include/uapi/linux/iommufd.h | 31 ++++++ drivers/iommu/iommufd/eventq.c | 138 ++++++++++++++++++++++++ drivers/iommu/iommufd/main.c | 6 ++ drivers/iommu/iommufd/viommu.c | 2 + 6 files changed, 239 insertions(+) diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 1c9a101cc435..fd0b87707967 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -548,6 +548,51 @@ static inline int iommufd_hwpt_replace_device(struct iommufd_device *idev, return iommu_group_replace_domain(idev->igroup->group, hwpt->domain); } +/* + * An iommufd_eventq_virq object represents a queue to deliver vIOMMU interrupts + * to the user space. These objects are created/destroyed by the user space and + * associated with vIOMMU object(s) during the allocations. + */ +struct iommufd_eventq_virq { + struct iommufd_eventq common; + struct iommufd_viommu *viommu; + struct workqueue_struct *irq_wq; + struct list_head node; + + unsigned int type; +}; + +static inline struct iommufd_eventq_virq * +to_eventq_virq(struct iommufd_eventq *eventq) +{ + return container_of(eventq, struct iommufd_eventq_virq, common); +} + +static inline struct iommufd_eventq_virq * +iommufd_get_eventq_virq(struct iommufd_ucmd *ucmd, u32 id) +{ + return container_of(iommufd_get_object(ucmd->ictx, id, + IOMMUFD_OBJ_EVENTQ_VIRQ), + struct iommufd_eventq_virq, common.obj); +} + +int iommufd_eventq_virq_alloc(struct iommufd_ucmd *ucmd); +void iommufd_eventq_virq_destroy(struct iommufd_object *obj); +void iommufd_eventq_virq_abort(struct iommufd_object *obj); + +/* An iommufd_virq represents a vIOMMU interrupt in an eventq_virq queue */ +struct iommufd_virq { + struct iommufd_eventq_virq *eventq_virq; + struct list_head node; + ssize_t irq_len; + void *irq_data; +}; + +static inline int iommufd_eventq_virq_handler(struct iommufd_virq *virq) +{ + return iommufd_eventq_notify(&virq->eventq_virq->common, &virq->node); +} + static inline struct iommufd_viommu * iommufd_get_viommu(struct iommufd_ucmd *ucmd, u32 id) { @@ -556,6 +601,20 @@ iommufd_get_viommu(struct iommufd_ucmd *ucmd, u32 id) struct iommufd_viommu, obj); } +static inline struct iommufd_eventq_virq * +iommufd_viommu_find_eventq_virq(struct iommufd_viommu *viommu, u32 type) +{ + struct iommufd_eventq_virq *eventq_virq, *next; + + lockdep_assert_held(&viommu->virqs_rwsem); + + list_for_each_entry_safe(eventq_virq, next, &viommu->virqs, node) { + if (eventq_virq->type == type) + return eventq_virq; + } + return NULL; +} + int iommufd_viommu_alloc_ioctl(struct iommufd_ucmd *ucmd); void iommufd_viommu_destroy(struct iommufd_object *obj); int iommufd_vdevice_alloc_ioctl(struct iommufd_ucmd *ucmd); diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 7ad105ab8090..40cc9bbb1d24 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -32,6 +32,7 @@ enum iommufd_object_type { IOMMUFD_OBJ_IOAS, IOMMUFD_OBJ_ACCESS, IOMMUFD_OBJ_EVENTQ_IOPF, + IOMMUFD_OBJ_EVENTQ_VIRQ, IOMMUFD_OBJ_VIOMMU, IOMMUFD_OBJ_VDEVICE, #ifdef CONFIG_IOMMUFD_TEST @@ -93,6 +94,8 @@ struct iommufd_viommu { const struct iommufd_viommu_ops *ops; struct xarray vdevs; + struct list_head virqs; + struct rw_semaphore virqs_rwsem; unsigned int type; }; diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index 34810f6ae2b5..d9319f5b7c69 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -55,6 +55,7 @@ enum { IOMMUFD_CMD_VIOMMU_ALLOC = 0x90, IOMMUFD_CMD_VDEVICE_ALLOC = 0x91, IOMMUFD_CMD_IOAS_CHANGE_PROCESS = 0x92, + IOMMUFD_CMD_VIRQ_ALLOC = 0x93, }; /** @@ -1012,4 +1013,34 @@ struct iommu_ioas_change_process { #define IOMMU_IOAS_CHANGE_PROCESS \ _IO(IOMMUFD_TYPE, IOMMUFD_CMD_IOAS_CHANGE_PROCESS) +/** + * enum iommu_virq_type - Virtual IRQ Type + * @IOMMU_VIRQ_TYPE_NONE: INVALID type + */ +enum iommu_virq_type { + IOMMU_VIRQ_TYPE_NONE = 0, +}; + +/** + * struct iommu_virq_alloc - ioctl(IOMMU_VIRQ_ALLOC) + * @size: sizeof(struct iommu_virq_alloc) + * @flags: Must be 0 + * @viommu: virtual IOMMU ID to associate the virtual IRQ with + * @type: Type of the virtual IRQ. Must be defined in enum iommu_virq_type + * @out_virq_id: The ID of the new virtual IRQ + * @out_fault_fd: The fd of the new virtual IRQ. User space must close the + * successfully returned fd after using it + * + * Explicitly allocate a virtual IRQ handler for a vIOMMU. A vIOMMU can have + * multiple FDs for different @type, but is confined to one FD per @type. + */ +struct iommu_virq_alloc { + __u32 size; + __u32 flags; + __u32 viommu_id; + __u32 type; + __u32 out_virq_id; + __u32 out_virq_fd; +}; +#define IOMMU_VIRQ_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VIRQ_ALLOC) #endif diff --git a/drivers/iommu/iommufd/eventq.c b/drivers/iommu/iommufd/eventq.c index 3674961a45c2..cf07b3c21f1e 100644 --- a/drivers/iommu/iommufd/eventq.c +++ b/drivers/iommu/iommufd/eventq.c @@ -346,6 +346,75 @@ static const struct iommufd_eventq_ops iommufd_eventq_iopf_ops = { .write = &iommufd_eventq_iopf_fops_write, }; +/* IOMMUFD_OBJ_EVENTQ_VIRQ Functions */ + +void iommufd_eventq_virq_abort(struct iommufd_object *obj) +{ + struct iommufd_eventq *eventq = + container_of(obj, struct iommufd_eventq, obj); + struct iommufd_eventq_virq *eventq_virq = to_eventq_virq(eventq); + struct iommufd_viommu *viommu = eventq_virq->viommu; + struct iommufd_virq *virq, *next; + + lockdep_assert_held_write(&viommu->virqs_rwsem); + + list_for_each_entry_safe(virq, next, &eventq->deliver, node) { + list_del(&virq->node); + kfree(virq); + } + + if (eventq_virq->irq_wq) + destroy_workqueue(eventq_virq->irq_wq); + refcount_dec(&viommu->obj.users); + mutex_destroy(&eventq->mutex); + list_del(&eventq_virq->node); +} + +void iommufd_eventq_virq_destroy(struct iommufd_object *obj) +{ + struct iommufd_eventq_virq *eventq_virq = + to_eventq_virq(container_of(obj, struct iommufd_eventq, obj)); + + down_write(&eventq_virq->viommu->virqs_rwsem); + iommufd_eventq_virq_abort(obj); + up_write(&eventq_virq->viommu->virqs_rwsem); +} + +static ssize_t iommufd_eventq_virq_fops_read(struct iommufd_eventq *eventq, + char __user *buf, size_t count, + loff_t *ppos) +{ + size_t done = 0; + int rc = 0; + + if (*ppos) + return -ESPIPE; + + mutex_lock(&eventq->mutex); + while (!list_empty(&eventq->deliver) && count > done) { + struct iommufd_virq *virq = list_first_entry( + &eventq->deliver, struct iommufd_virq, node); + + if (virq->irq_len > count - done) + break; + + if (copy_to_user(buf + done, virq->irq_data, virq->irq_len)) { + rc = -EFAULT; + break; + } + done += virq->irq_len; + list_del(&virq->node); + kfree(virq); + } + mutex_unlock(&eventq->mutex); + + return done == 0 ? rc : done; +} + +static const struct iommufd_eventq_ops iommufd_eventq_virq_ops = { + .read = &iommufd_eventq_virq_fops_read, +}; + /* Common Event Queue Functions */ static ssize_t iommufd_eventq_fops_read(struct file *filep, char __user *buf, @@ -472,3 +541,72 @@ int iommufd_eventq_iopf_alloc(struct iommufd_ucmd *ucmd) return rc; } + +int iommufd_eventq_virq_alloc(struct iommufd_ucmd *ucmd) +{ + struct iommu_virq_alloc *cmd = ucmd->cmd; + struct iommufd_eventq_virq *eventq_virq; + struct iommufd_viommu *viommu; + int fdno; + int rc; + + if (cmd->flags || cmd->type == IOMMU_VIRQ_TYPE_NONE) + return -EOPNOTSUPP; + + viommu = iommufd_get_viommu(ucmd, cmd->viommu_id); + if (IS_ERR(viommu)) + return PTR_ERR(viommu); + down_write(&viommu->virqs_rwsem); + + if (iommufd_viommu_find_eventq_virq(viommu, cmd->type)) { + rc = -EEXIST; + goto out_unlock_virqs; + } + + eventq_virq = __iommufd_object_alloc( + ucmd->ictx, eventq_virq, IOMMUFD_OBJ_EVENTQ_VIRQ, common.obj); + if (IS_ERR(eventq_virq)) { + rc = PTR_ERR(eventq_virq); + goto out_unlock_virqs; + } + + eventq_virq->type = cmd->type; + eventq_virq->viommu = viommu; + refcount_inc(&viommu->obj.users); + list_add_tail(&eventq_virq->node, &viommu->virqs); + + fdno = iommufd_eventq_init(&eventq_virq->common, "[iommufd-viommu-irq]", + ucmd->ictx, &iommufd_eventq_virq_ops); + if (fdno < 0) { + rc = fdno; + goto out_abort; + } + + eventq_virq->irq_wq = alloc_workqueue("viommu_irq/%d", WQ_UNBOUND, 0, + eventq_virq->common.obj.id); + if (!eventq_virq->irq_wq) { + rc = -ENOMEM; + goto out_put_fdno; + } + + cmd->out_virq_id = eventq_virq->common.obj.id; + cmd->out_virq_fd = fdno; + + rc = iommufd_ucmd_respond(ucmd, sizeof(*cmd)); + if (rc) + goto out_put_fdno; + + iommufd_object_finalize(ucmd->ictx, &eventq_virq->common.obj); + fd_install(fdno, eventq_virq->common.filep); + goto out_unlock_virqs; + +out_put_fdno: + put_unused_fd(fdno); + fput(eventq_virq->common.filep); +out_abort: + iommufd_object_abort_and_destroy(ucmd->ictx, &eventq_virq->common.obj); +out_unlock_virqs: + up_write(&viommu->virqs_rwsem); + iommufd_put_object(ucmd->ictx, &viommu->obj); + return rc; +} diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c index 539c24ada6d0..89e8ac56f4ce 100644 --- a/drivers/iommu/iommufd/main.c +++ b/drivers/iommu/iommufd/main.c @@ -335,6 +335,8 @@ static const struct iommufd_ioctl_op iommufd_ioctl_ops[] = { IOCTL_OP(IOMMU_DESTROY, iommufd_destroy, struct iommu_destroy, id), IOCTL_OP(IOMMU_FAULT_QUEUE_ALLOC, iommufd_eventq_iopf_alloc, struct iommu_fault_alloc, out_fault_fd), + IOCTL_OP(IOMMU_VIRQ_ALLOC, iommufd_eventq_virq_alloc, + struct iommu_virq_alloc, out_virq_fd), IOCTL_OP(IOMMU_GET_HW_INFO, iommufd_get_hw_info, struct iommu_hw_info, __reserved), IOCTL_OP(IOMMU_HWPT_ALLOC, iommufd_hwpt_alloc, struct iommu_hwpt_alloc, @@ -504,6 +506,10 @@ static const struct iommufd_object_ops iommufd_object_ops[] = { [IOMMUFD_OBJ_EVENTQ_IOPF] = { .destroy = iommufd_eventq_iopf_destroy, }, + [IOMMUFD_OBJ_EVENTQ_VIRQ] = { + .destroy = iommufd_eventq_virq_destroy, + .abort = iommufd_eventq_virq_abort, + }, [IOMMUFD_OBJ_VIOMMU] = { .destroy = iommufd_viommu_destroy, }, diff --git a/drivers/iommu/iommufd/viommu.c b/drivers/iommu/iommufd/viommu.c index 69b88e8c7c26..075b6aed79bc 100644 --- a/drivers/iommu/iommufd/viommu.c +++ b/drivers/iommu/iommufd/viommu.c @@ -59,6 +59,8 @@ int iommufd_viommu_alloc_ioctl(struct iommufd_ucmd *ucmd) viommu->ictx = ucmd->ictx; viommu->hwpt = hwpt_paging; refcount_inc(&viommu->hwpt->common.obj.users); + INIT_LIST_HEAD(&viommu->virqs); + init_rwsem(&viommu->virqs_rwsem); /* * It is the most likely case that a physical IOMMU is unpluggable. 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Dec 2024 22:10:58.8337 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7b2e817f-6c61-46fa-dfc0-08dd13e75dcb X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002324.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB9027 This is a reverse search v.s. iommufd_viommu_find_dev, as drivers may want to convert a struct device pointer (physical) to its virtual device ID for an event injection to the user space VM. Again, this avoids exposing more core structures to the drivers, than the iommufd_viommu alone. Signed-off-by: Nicolin Chen --- include/linux/iommufd.h | 8 ++++++++ drivers/iommu/iommufd/driver.c | 18 ++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 40cc9bbb1d24..1f5376476cfa 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -190,6 +190,8 @@ struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx, enum iommufd_object_type type); struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu, unsigned long vdev_id); +unsigned long iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu, + struct device *dev); #else /* !CONFIG_IOMMUFD_DRIVER_CORE */ static inline struct iommufd_object * _iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size, @@ -203,6 +205,12 @@ iommufd_viommu_find_dev(struct iommufd_viommu *viommu, unsigned long vdev_id) { return NULL; } + +static inline unsigned long +iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu, struct device *dev) +{ + return 0; +} #endif /* CONFIG_IOMMUFD_DRIVER_CORE */ /* diff --git a/drivers/iommu/iommufd/driver.c b/drivers/iommu/iommufd/driver.c index 7b67fdf44134..817e430a11bc 100644 --- a/drivers/iommu/iommufd/driver.c +++ b/drivers/iommu/iommufd/driver.c @@ -49,5 +49,23 @@ struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu, } EXPORT_SYMBOL_NS_GPL(iommufd_viommu_find_dev, IOMMUFD); +/* Return 0 if device is not associated to the vIOMMU */ +unsigned long iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu, + struct device *dev) +{ + struct iommufd_vdevice *vdev; + unsigned long vdev_id = 0; + unsigned long index; + + xa_lock(&viommu->vdevs); + xa_for_each(&viommu->vdevs, index, vdev) { + if (vdev && vdev->dev == dev) + vdev_id = (unsigned long)vdev->id; + } + xa_unlock(&viommu->vdevs); + return vdev_id; +} +EXPORT_SYMBOL_NS_GPL(iommufd_viommu_get_vdev_id, IOMMUFD); + MODULE_DESCRIPTION("iommufd code shared with builtin modules"); MODULE_LICENSE("GPL"); From patchwork Tue Dec 3 22:10:12 2024 Content-Type: text/plain; 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Tue, 3 Dec 2024 14:10:41 -0800 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , , , , Subject: [PATCH v2 07/13] iommufd/viommu: Add iommufd_viommu_report_irq helper Date: Tue, 3 Dec 2024 14:10:12 -0800 Message-ID: <7e9842376e6235d9e3471356d035afe2bfe8f33b.1733263737.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000F0E2:EE_|IA0PR12MB7676:EE_ X-MS-Office365-Filtering-Correlation-Id: 3debc2dd-aa90-4e77-4257-08dd13e75d86 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|82310400026|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(7416014)(82310400026)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Dec 2024 22:10:58.2525 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3debc2dd-aa90-4e77-4257-08dd13e75d86 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000F0E2.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB7676 Similar to iommu_report_device_fault, this allows IOMMU drivers to report, from threaded IRQ handlers to user space hypervisors, IRQs or events that belong to a vIOMMU. Signed-off-by: Nicolin Chen --- include/linux/iommufd.h | 9 ++++++++ drivers/iommu/iommufd/driver.c | 41 ++++++++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+) diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 1f5376476cfa..2ce78edec4e9 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -192,6 +192,8 @@ struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu, unsigned long vdev_id); unsigned long iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu, struct device *dev); +int iommufd_viommu_report_irq(struct iommufd_viommu *viommu, unsigned int type, + void *irq_ptr, size_t irq_len); #else /* !CONFIG_IOMMUFD_DRIVER_CORE */ static inline struct iommufd_object * _iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size, @@ -211,6 +213,13 @@ iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu, struct device *dev) { return 0; } + +static inline int iommufd_viommu_report_irq(struct iommufd_viommu *viommu, + unsigned int type, void *irq_ptr, + size_t irq_len) +{ + return -EOPNOTSUPP; +} #endif /* CONFIG_IOMMUFD_DRIVER_CORE */ /* diff --git a/drivers/iommu/iommufd/driver.c b/drivers/iommu/iommufd/driver.c index 817e430a11bc..339baa270d1e 100644 --- a/drivers/iommu/iommufd/driver.c +++ b/drivers/iommu/iommufd/driver.c @@ -67,5 +67,46 @@ unsigned long iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu, } EXPORT_SYMBOL_NS_GPL(iommufd_viommu_get_vdev_id, IOMMUFD); +/* Typically called in driver's threaded IRQ handler */ +int iommufd_viommu_report_irq(struct iommufd_viommu *viommu, unsigned int type, + void *irq_ptr, size_t irq_len) +{ + struct iommufd_eventq_virq *eventq_virq; + struct iommufd_virq *virq; + int rc = 0; + + might_sleep(); + + if (!viommu) + return -ENODEV; + if (WARN_ON_ONCE(!irq_len || !irq_ptr)) + return -EINVAL; + + down_read(&viommu->virqs_rwsem); + + eventq_virq = iommufd_viommu_find_eventq_virq(viommu, type); + if (!eventq_virq) { + rc = -EOPNOTSUPP; + goto out_unlock_vdev_ids; + } + + virq = kzalloc(sizeof(*virq) + irq_len, GFP_KERNEL); + if (!virq) { + rc = -ENOMEM; + goto out_unlock_vdev_ids; + } + virq->irq_data = (void *)virq + sizeof(*virq); + memcpy(virq->irq_data, irq_ptr, irq_len); + + virq->eventq_virq = eventq_virq; + virq->irq_len = irq_len; + + iommufd_eventq_virq_handler(virq); +out_unlock_vdev_ids: + up_read(&viommu->virqs_rwsem); + return rc; +} +EXPORT_SYMBOL_NS_GPL(iommufd_viommu_report_irq, IOMMUFD); + MODULE_DESCRIPTION("iommufd code shared with builtin modules"); MODULE_LICENSE("GPL"); From patchwork Tue Dec 3 22:10:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 13893026 Received: from NAM11-DM6-obe.outbound.protection.outlook.com (mail-dm6nam11on2057.outbound.protection.outlook.com [40.107.223.57]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 50EDE20ADF4; Tue, 3 Dec 2024 22:11:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Dec 2024 22:11:00.0172 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7fac7154-1e23-4275-7800-08dd13e75e80 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002327.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB7253 When attaching a device to a vIOMMU-based nested domain, vdev_id must be present. Add a piece of code hard-requesting it, for vIRQ support in the following patch. Then, update the TEST_F. A HWPT-based nested domain will return a NULL new_viommu, thus no such a vDEVICE requirement. Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/selftest.c | 23 +++++++++++++++++++++++ tools/testing/selftests/iommu/iommufd.c | 5 +++++ 2 files changed, 28 insertions(+) diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c index a0de6d6d4e68..d1438d81e664 100644 --- a/drivers/iommu/iommufd/selftest.c +++ b/drivers/iommu/iommufd/selftest.c @@ -161,7 +161,10 @@ enum selftest_obj_type { struct mock_dev { struct device dev; + struct mock_viommu *viommu; + struct rw_semaphore viommu_rwsem; unsigned long flags; + unsigned long vdev_id; int id; u32 cache[MOCK_DEV_CACHE_NUM]; }; @@ -193,10 +196,29 @@ static int mock_domain_nop_attach(struct iommu_domain *domain, struct device *dev) { struct mock_dev *mdev = to_mock_dev(dev); + struct mock_viommu *new_viommu = NULL; + unsigned long vdev_id = 0; if (domain->dirty_ops && (mdev->flags & MOCK_FLAGS_DEVICE_NO_DIRTY)) return -EINVAL; + iommu_group_mutex_assert(dev); + if (domain->type == IOMMU_DOMAIN_NESTED) { + new_viommu = to_mock_nested(domain)->mock_viommu; + if (new_viommu) { + vdev_id = iommufd_viommu_get_vdev_id(&new_viommu->core, + dev); + if (!vdev_id) + return -ENOENT; + } + } + if (new_viommu != mdev->viommu) { + down_write(&mdev->viommu_rwsem); + mdev->viommu = new_viommu; + mdev->vdev_id = vdev_id; + up_write(&mdev->viommu_rwsem); + } + return 0; } @@ -861,6 +883,7 @@ static struct mock_dev *mock_dev_create(unsigned long dev_flags) if (!mdev) return ERR_PTR(-ENOMEM); + init_rwsem(&mdev->viommu_rwsem); device_initialize(&mdev->dev); mdev->flags = dev_flags; mdev->dev.release = mock_dev_release; diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c index a1b2b657999d..212e5d62e13d 100644 --- a/tools/testing/selftests/iommu/iommufd.c +++ b/tools/testing/selftests/iommu/iommufd.c @@ -2736,6 +2736,7 @@ TEST_F(iommufd_viommu, viommu_alloc_nested_iopf) uint32_t iopf_hwpt_id; uint32_t fault_id; uint32_t fault_fd; + uint32_t vdev_id; if (self->device_id) { test_ioctl_fault_alloc(&fault_id, &fault_fd); @@ -2752,6 +2753,10 @@ TEST_F(iommufd_viommu, viommu_alloc_nested_iopf) &iopf_hwpt_id, IOMMU_HWPT_DATA_SELFTEST, &data, sizeof(data)); + /* Must allocate vdevice before attaching to a nested hwpt */ + test_err_mock_domain_replace(ENOENT, self->stdev_id, + iopf_hwpt_id); + test_cmd_vdevice_alloc(viommu_id, dev_id, 0x99, &vdev_id); test_cmd_mock_domain_replace(self->stdev_id, iopf_hwpt_id); EXPECT_ERRNO(EBUSY, _test_ioctl_destroy(self->fd, iopf_hwpt_id)); From patchwork Tue Dec 3 22:10:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 13893028 Received: from NAM04-MW2-obe.outbound.protection.outlook.com (mail-mw2nam04on2065.outbound.protection.outlook.com [40.107.101.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 486B620B7E3; Tue, 3 Dec 2024 22:11:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/iommufd_test.h | 10 ++++++++++ drivers/iommu/iommufd/selftest.c | 30 ++++++++++++++++++++++++++++ 2 files changed, 40 insertions(+) diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h index a6b7a163f636..3037904f2e52 100644 --- a/drivers/iommu/iommufd/iommufd_test.h +++ b/drivers/iommu/iommufd/iommufd_test.h @@ -24,6 +24,7 @@ enum { IOMMU_TEST_OP_MD_CHECK_IOTLB, IOMMU_TEST_OP_TRIGGER_IOPF, IOMMU_TEST_OP_DEV_CHECK_CACHE, + IOMMU_TEST_OP_TRIGGER_VIRQ, }; enum { @@ -145,6 +146,9 @@ struct iommu_test_cmd { __u32 id; __u32 cache; } check_dev_cache; + struct { + __u32 dev_id; + } trigger_virq; }; __u32 last; }; @@ -212,4 +216,10 @@ struct iommu_viommu_invalidate_selftest { __u32 cache_id; }; +#define IOMMU_VIRQ_TYPE_SELFTEST 0xbeefbeef + +struct iommu_viommu_irq_selftest { + __u32 virt_id; +}; + #endif diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c index d1438d81e664..0785c9447102 100644 --- a/drivers/iommu/iommufd/selftest.c +++ b/drivers/iommu/iommufd/selftest.c @@ -1631,6 +1631,34 @@ static int iommufd_test_trigger_iopf(struct iommufd_ucmd *ucmd, return 0; } +static int iommufd_test_trigger_virq(struct iommufd_ucmd *ucmd, + struct iommu_test_cmd *cmd) +{ + struct iommu_viommu_irq_selftest test = {}; + struct iommufd_device *idev; + struct mock_dev *mdev; + int rc = -ENOENT; + + idev = iommufd_get_device(ucmd, cmd->trigger_virq.dev_id); + if (IS_ERR(idev)) + return PTR_ERR(idev); + mdev = to_mock_dev(idev->dev); + + down_read(&mdev->viommu_rwsem); + if (!mdev->viommu || !mdev->vdev_id) + goto out_unlock; + + test.virt_id = mdev->vdev_id; + rc = iommufd_viommu_report_irq(&mdev->viommu->core, + IOMMU_VIRQ_TYPE_SELFTEST, &test, + sizeof(test)); +out_unlock: + up_read(&mdev->viommu_rwsem); + iommufd_put_object(ucmd->ictx, &idev->obj); + + return rc; +} + void iommufd_selftest_destroy(struct iommufd_object *obj) { struct selftest_obj *sobj = to_selftest_obj(obj); @@ -1712,6 +1740,8 @@ int iommufd_test(struct iommufd_ucmd *ucmd) cmd->dirty.flags); case IOMMU_TEST_OP_TRIGGER_IOPF: return iommufd_test_trigger_iopf(ucmd, cmd); + case IOMMU_TEST_OP_TRIGGER_VIRQ: + return iommufd_test_trigger_virq(ucmd, cmd); 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Signed-off-by: Nicolin Chen --- tools/testing/selftests/iommu/iommufd_utils.h | 63 +++++++++++++++++++ tools/testing/selftests/iommu/iommufd.c | 22 +++++++ .../selftests/iommu/iommufd_fail_nth.c | 6 ++ 3 files changed, 91 insertions(+) diff --git a/tools/testing/selftests/iommu/iommufd_utils.h b/tools/testing/selftests/iommu/iommufd_utils.h index d979f5b0efe8..7e3e07c943cc 100644 --- a/tools/testing/selftests/iommu/iommufd_utils.h +++ b/tools/testing/selftests/iommu/iommufd_utils.h @@ -9,6 +9,7 @@ #include #include #include +#include #include "../kselftest_harness.h" #include "../../../../drivers/iommu/iommufd/iommufd_test.h" @@ -936,3 +937,65 @@ static int _test_cmd_vdevice_alloc(int fd, __u32 viommu_id, __u32 idev_id, EXPECT_ERRNO(_errno, \ _test_cmd_vdevice_alloc(self->fd, viommu_id, idev_id, \ virt_id, vdev_id)) + +static int _test_cmd_virq_alloc(int fd, __u32 viommu_id, __u32 type, + __u32 *virq_id, __u32 *virq_fd) +{ + struct iommu_virq_alloc cmd = { + .size = sizeof(cmd), + .type = type, + .viommu_id = viommu_id, + }; + int ret; + + ret = ioctl(fd, IOMMU_VIRQ_ALLOC, &cmd); + if (ret) + return ret; + if (virq_id) + *virq_id = cmd.out_virq_id; + if (virq_fd) + *virq_fd = cmd.out_virq_fd; + return 0; +} + +#define test_cmd_virq_alloc(viommu_id, type, virq_id, virq_fd) \ + ASSERT_EQ(0, _test_cmd_virq_alloc(self->fd, viommu_id, type, \ + virq_id, virq_fd)) +#define test_err_virq_alloc(_errno, viommu_id, type, virq_id, virq_fd) \ + EXPECT_ERRNO(_errno, _test_cmd_virq_alloc(self->fd, viommu_id, type, \ + virq_id, virq_fd)) + +static int _test_cmd_trigger_virq(int fd, __u32 dev_id, __u32 event_fd, + __u32 virt_id) +{ + struct iommu_test_cmd trigger_virq_cmd = { + .size = sizeof(trigger_virq_cmd), + .op = IOMMU_TEST_OP_TRIGGER_VIRQ, + .trigger_virq = { + .dev_id = dev_id, + }, + }; + struct pollfd pollfd = { .fd = event_fd, .events = POLLIN }; + struct iommu_viommu_irq_selftest irq; + ssize_t bytes; + int ret; + + ret = ioctl(fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_TRIGGER_VIRQ), + &trigger_virq_cmd); + if (ret) + return ret; + + ret = poll(&pollfd, 1, 1000); + if (ret < 0) + return ret; + + bytes = read(event_fd, &irq, sizeof(irq)); + if (bytes <= 0) + return -EIO; + + return irq.virt_id == virt_id ? 0 : -EINVAL; +} + +#define test_cmd_trigger_virq(dev_id, event_fd, vdev_id) \ + ASSERT_EQ(0, \ + _test_cmd_trigger_virq(self->fd, dev_id, event_fd, vdev_id)) diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c index 212e5d62e13d..b15ebc963e56 100644 --- a/tools/testing/selftests/iommu/iommufd.c +++ b/tools/testing/selftests/iommu/iommufd.c @@ -2774,15 +2774,37 @@ TEST_F(iommufd_viommu, vdevice_alloc) uint32_t viommu_id = self->viommu_id; uint32_t dev_id = self->device_id; uint32_t vdev_id = 0; + uint32_t virq_id; + uint32_t virq_fd; if (dev_id) { + /* Must allocate vdevice before attaching to a nested hwpt */ + test_err_mock_domain_replace(ENOENT, self->stdev_id, + self->nested_hwpt_id); + + test_cmd_virq_alloc(viommu_id, IOMMU_VIRQ_TYPE_SELFTEST, + &virq_id, &virq_fd); + test_err_virq_alloc(EEXIST, viommu_id, IOMMU_VIRQ_TYPE_SELFTEST, + NULL, NULL); /* Set vdev_id to 0x99, unset it, and set to 0x88 */ test_cmd_vdevice_alloc(viommu_id, dev_id, 0x99, &vdev_id); + test_cmd_mock_domain_replace(self->stdev_id, + self->nested_hwpt_id); + test_cmd_trigger_virq(dev_id, virq_fd, 0x99); test_err_vdevice_alloc(EEXIST, viommu_id, dev_id, 0x99, &vdev_id); + test_cmd_mock_domain_replace(self->stdev_id, self->ioas_id); test_ioctl_destroy(vdev_id); + + /* Try again with 0x88 */ test_cmd_vdevice_alloc(viommu_id, dev_id, 0x88, &vdev_id); + test_cmd_mock_domain_replace(self->stdev_id, + self->nested_hwpt_id); + test_cmd_trigger_virq(dev_id, virq_fd, 0x88); + close(virq_fd); + test_cmd_mock_domain_replace(self->stdev_id, self->ioas_id); test_ioctl_destroy(vdev_id); + test_ioctl_destroy(virq_id); } else { test_err_vdevice_alloc(ENOENT, viommu_id, dev_id, 0x99, NULL); } diff --git a/tools/testing/selftests/iommu/iommufd_fail_nth.c b/tools/testing/selftests/iommu/iommufd_fail_nth.c index 64b1f8e1b0cf..442442de3a75 100644 --- a/tools/testing/selftests/iommu/iommufd_fail_nth.c +++ b/tools/testing/selftests/iommu/iommufd_fail_nth.c @@ -620,6 +620,7 @@ TEST_FAIL_NTH(basic_fail_nth, device) }; struct iommu_test_hw_info info; uint32_t fault_id, fault_fd; + uint32_t virq_id, virq_fd; uint32_t fault_hwpt_id; uint32_t ioas_id; uint32_t ioas_id2; @@ -692,6 +693,11 @@ TEST_FAIL_NTH(basic_fail_nth, device) IOMMU_HWPT_DATA_SELFTEST, &data, sizeof(data))) return -1; + if (_test_cmd_virq_alloc(self->fd, viommu_id, IOMMU_VIRQ_TYPE_SELFTEST, + &virq_id, &virq_fd)) + return -1; + close(virq_fd); + return 0; } From patchwork Tue Dec 3 22:10:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 13893030 Received: from NAM12-MW2-obe.outbound.protection.outlook.com (mail-mw2nam12on2056.outbound.protection.outlook.com [40.107.244.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D52BC20B808; Tue, 3 Dec 2024 22:11:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.244.56 ARC-Seal: i=2; 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Signed-off-by: Nicolin Chen --- Documentation/userspace-api/iommufd.rst | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/Documentation/userspace-api/iommufd.rst b/Documentation/userspace-api/iommufd.rst index 70289d6815d2..798520d9344d 100644 --- a/Documentation/userspace-api/iommufd.rst +++ b/Documentation/userspace-api/iommufd.rst @@ -63,6 +63,14 @@ Following IOMMUFD objects are exposed to userspace: space usually has mappings from guest-level I/O virtual addresses to guest- level physical addresses. +- IOMMUFD_OBJ_EVENTQ_IOPF, representing a software queue for an HWPT_NESTED + reporting IO Page Fault using the IOMMU HW's PRI (Page Request Interface). + This queue object provides user space an FD to poll the page fault events + and also to respond to those events. An EVENTQ_IOPF object must be created + first to get a fault_id that could be then used to allocate an HWPT_NESTED + via the IOMMU_HWPT_ALLOC command setting IOMMU_HWPT_FAULT_ID_VALID set in + its flags field. + - IOMMUFD_OBJ_VIOMMU, representing a slice of the physical IOMMU instance, passed to or shared with a VM. It may be some HW-accelerated virtualization features and some SW resources used by the VM. For examples: @@ -109,6 +117,15 @@ Following IOMMUFD objects are exposed to userspace: vIOMMU, which is a separate ioctl call from attaching the same device to an HWPT_PAGING that the vIOMMU holds. +- IOMMUFD_OBJ_EVENTQ_VIRQ, representing a software queue for IOMMUFD_OBJ_VIOMMU + reporting its non-affiliated events, such as translation faults occurred to a + nested stage-1 and HW-specific events/irqs e.g. events to invalidation queues + that are assigned to VMs via vIOMMUs. This queue object provides user space an + FD to poll the vIOMMU events. A vIOMMU object must be created first to get its + viommu_id that could be then used to allocate an EVENTQ_VIRQ. Each vIOMMU can + support multiple types of EVENTQ_VIRQs, but is confined to one EVENTQ_VIRQ per + vIRQ type. + All user-visible objects are destroyed via the IOMMU_DESTROY uAPI. The diagrams below show relationships between user-visible objects and kernel @@ -251,8 +268,10 @@ User visible objects are backed by following datastructures: - iommufd_device for IOMMUFD_OBJ_DEVICE. - iommufd_hwpt_paging for IOMMUFD_OBJ_HWPT_PAGING. - iommufd_hwpt_nested for IOMMUFD_OBJ_HWPT_NESTED. +- iommufd_eventq_iopf for IOMMUFD_OBJ_EVENTQ_IOPF. - iommufd_viommu for IOMMUFD_OBJ_VIOMMU. - iommufd_vdevice for IOMMUFD_OBJ_VDEVICE. +- iommufd_eventq_virq for IOMMUFD_OBJ_EVENTQ_VIRQ. 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Dec 2024 22:11:07.2360 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: eb341530-a642-4640-f842-08dd13e762cd X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002327.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5939 Use it to store all vSMMU-related data. The vsid (Virtual Stream ID) will be the first use case. Then, add a rw_semaphore to protect it. Also add a pair of arm_smmu_attach_prepare/commit_vmaster helpers and put them in the existing arm_smmu_attach_prepare/commit(). Note that identity and blocked ops don't call arm_smmu_attach_prepare/commit(), thus simply call the new helpers at the top. Signed-off-by: Nicolin Chen --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 23 +++++++++ .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 49 +++++++++++++++++++ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 32 +++++++++++- 3 files changed, 103 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h index 0107d3f333a1..ec7cff33a0b1 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -789,11 +789,18 @@ struct arm_smmu_stream { struct rb_node node; }; +struct arm_smmu_vmaster { + struct arm_vsmmu *vsmmu; + unsigned long vsid; +}; + /* SMMU private data for each master */ struct arm_smmu_master { struct arm_smmu_device *smmu; struct device *dev; struct arm_smmu_stream *streams; + struct arm_smmu_vmaster *vmaster; + struct rw_semaphore vmaster_rwsem; /* Locked by the iommu core using the group mutex */ struct arm_smmu_ctx_desc_cfg cd_table; unsigned int num_streams; @@ -943,6 +950,7 @@ struct arm_smmu_attach_state { bool disable_ats; ioasid_t ssid; /* Resulting state */ + struct arm_smmu_vmaster *vmaster; bool ats_enabled; }; @@ -1026,9 +1034,24 @@ struct iommufd_viommu *arm_vsmmu_alloc(struct device *dev, struct iommu_domain *parent, struct iommufd_ctx *ictx, unsigned int viommu_type); +int arm_smmu_attach_prepare_vmaster(struct arm_smmu_attach_state *state, + struct iommu_domain *domain); +void arm_smmu_attach_commit_vmaster(struct arm_smmu_attach_state *state); #else #define arm_smmu_hw_info NULL #define arm_vsmmu_alloc NULL + +static inline int +arm_smmu_attach_prepare_vmaster(struct arm_smmu_attach_state *state, + struct iommu_domain *domain) +{ + return 0; /* NOP */ +} + +static inline void +arm_smmu_attach_commit_vmaster(struct arm_smmu_attach_state *state) +{ +} #endif /* CONFIG_ARM_SMMU_V3_IOMMUFD */ #endif /* _ARM_SMMU_V3_H */ diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c index 6cc14d82399f..3a77eca949e6 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c @@ -85,6 +85,55 @@ static void arm_smmu_make_nested_domain_ste( } } +int arm_smmu_attach_prepare_vmaster(struct arm_smmu_attach_state *state, + struct iommu_domain *domain) +{ + struct arm_smmu_nested_domain *nested_domain; + struct arm_smmu_vmaster *vmaster; + unsigned long vsid; + unsigned int cfg; + + iommu_group_mutex_assert(state->master->dev); + + if (domain->type != IOMMU_DOMAIN_NESTED) + return 0; + nested_domain = to_smmu_nested_domain(domain); + + /* Skip ABORT/BYPASS or invalid vSTE */ + cfg = FIELD_GET(STRTAB_STE_0_CFG, le64_to_cpu(nested_domain->ste[0])); + if (cfg == STRTAB_STE_0_CFG_ABORT || cfg == STRTAB_STE_0_CFG_BYPASS) + return 0; + if (!(nested_domain->ste[0] & cpu_to_le64(STRTAB_STE_0_V))) + return 0; + + vsid = iommufd_viommu_get_vdev_id(&nested_domain->vsmmu->core, + state->master->dev); + /* Fail the attach if vSID is not correct set by the user space */ + if (!vsid) + return -ENOENT; + + vmaster = kzalloc(sizeof(*vmaster), GFP_KERNEL); + if (!vmaster) + return -ENOMEM; + vmaster->vsmmu = nested_domain->vsmmu; + vmaster->vsid = vsid; + state->vmaster = vmaster; + + return 0; +} + +void arm_smmu_attach_commit_vmaster(struct arm_smmu_attach_state *state) +{ + struct arm_smmu_master *master = state->master; + + down_write(&master->vmaster_rwsem); + if (state->vmaster != master->vmaster) { + kfree(master->vmaster); + master->vmaster = state->vmaster; + } + up_write(&master->vmaster_rwsem); +} + static int arm_smmu_attach_dev_nested(struct iommu_domain *domain, struct device *dev) { diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index e4ebd9e12ad4..6a6113b36360 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -2730,6 +2730,7 @@ int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state, struct arm_smmu_domain *smmu_domain = to_smmu_domain_devices(new_domain); unsigned long flags; + int ret; /* * arm_smmu_share_asid() must not see two domains pointing to the same @@ -2754,9 +2755,15 @@ int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state, } if (smmu_domain) { + ret = arm_smmu_attach_prepare_vmaster(state, new_domain); + if (ret) + return ret; + master_domain = kzalloc(sizeof(*master_domain), GFP_KERNEL); - if (!master_domain) + if (!master_domain) { + kfree(state->vmaster); return -ENOMEM; + } master_domain->master = master; master_domain->ssid = state->ssid; if (new_domain->type == IOMMU_DOMAIN_NESTED) @@ -2783,6 +2790,7 @@ int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state, spin_unlock_irqrestore(&smmu_domain->devices_lock, flags); kfree(master_domain); + kfree(state->vmaster); return -EINVAL; } @@ -2815,6 +2823,8 @@ void arm_smmu_attach_commit(struct arm_smmu_attach_state *state) lockdep_assert_held(&arm_smmu_asid_lock); + arm_smmu_attach_commit_vmaster(state); + if (state->ats_enabled && !master->ats_enabled) { arm_smmu_enable_ats(master); } else if (state->ats_enabled && master->ats_enabled) { @@ -3094,8 +3104,17 @@ static void arm_smmu_attach_dev_ste(struct iommu_domain *domain, static int arm_smmu_attach_dev_identity(struct iommu_domain *domain, struct device *dev) { + int ret; struct arm_smmu_ste ste; struct arm_smmu_master *master = dev_iommu_priv_get(dev); + struct arm_smmu_attach_state state = { + .master = master, + }; + + ret = arm_smmu_attach_prepare_vmaster(&state, domain); + if (ret) + return ret; + arm_smmu_attach_commit_vmaster(&state); arm_smmu_make_bypass_ste(master->smmu, &ste); arm_smmu_attach_dev_ste(domain, dev, &ste, STRTAB_STE_1_S1DSS_BYPASS); @@ -3114,7 +3133,17 @@ static struct iommu_domain arm_smmu_identity_domain = { static int arm_smmu_attach_dev_blocked(struct iommu_domain *domain, struct device *dev) { + int ret; struct arm_smmu_ste ste; + struct arm_smmu_master *master = dev_iommu_priv_get(dev); + struct arm_smmu_attach_state state = { + .master = master, + }; + + ret = arm_smmu_attach_prepare_vmaster(&state, domain); + if (ret) + return ret; + arm_smmu_attach_commit_vmaster(&state); arm_smmu_make_abort_ste(&ste); arm_smmu_attach_dev_ste(domain, dev, &ste, @@ -3345,6 +3374,7 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev) master->dev = dev; master->smmu = smmu; + init_rwsem(&master->vmaster_rwsem); dev_iommu_priv_set(dev, master); ret = arm_smmu_insert_master(smmu, master); 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Tue, 3 Dec 2024 14:10:49 -0800 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , , , , Subject: [PATCH v2 13/13] iommu/arm-smmu-v3: Report IRQs that belong to devices attached to vIOMMU Date: Tue, 3 Dec 2024 14:10:18 -0800 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00002327:EE_|MN0PR12MB6368:EE_ X-MS-Office365-Filtering-Correlation-Id: d65dd2f3-5871-48a6-b8db-08dd13e7632f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|1800799024|376014|7416014; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(1800799024)(376014)(7416014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Dec 2024 22:11:07.8610 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d65dd2f3-5871-48a6-b8db-08dd13e7632f X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002327.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB6368 Aside from the IOPF framework, iommufd provides an additional pathway to report a hardware event or IRQ, via the vIRQ of vIOMMU infrastructure. Define an iommu_virq_arm_smmuv3 uAPI structure, and report stage-1 faults in the threaded IRQ handler. Signed-off-by: Nicolin Chen --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 7 +++ include/uapi/linux/iommufd.h | 14 +++++ .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 16 +++++ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 62 ++++++++++--------- 4 files changed, 71 insertions(+), 28 deletions(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h index ec7cff33a0b1..05915f141eb8 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -1037,6 +1037,7 @@ struct iommufd_viommu *arm_vsmmu_alloc(struct device *dev, int arm_smmu_attach_prepare_vmaster(struct arm_smmu_attach_state *state, struct iommu_domain *domain); void arm_smmu_attach_commit_vmaster(struct arm_smmu_attach_state *state); +int arm_vmaster_report_event(struct arm_smmu_vmaster *vmaster, u64 *evt); #else #define arm_smmu_hw_info NULL #define arm_vsmmu_alloc NULL @@ -1052,6 +1053,12 @@ static inline void arm_smmu_attach_commit_vmaster(struct arm_smmu_attach_state *state) { } + +static inline int +arm_vmaster_report_event(struct arm_smmu_vmaster *vmaster, u64 *evt) +{ + return -EOPNOTSUPP; +} #endif /* CONFIG_ARM_SMMU_V3_IOMMUFD */ #endif /* _ARM_SMMU_V3_H */ diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index d9319f5b7c69..164920d7f0ab 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -1016,9 +1016,23 @@ struct iommu_ioas_change_process { /** * enum iommu_virq_type - Virtual IRQ Type * @IOMMU_VIRQ_TYPE_NONE: INVALID type + * @IOMMU_VIRQ_TYPE_ARM_SMMUV3: ARM SMMUv3 Virtual Event */ enum iommu_virq_type { IOMMU_VIRQ_TYPE_NONE = 0, + IOMMU_VIRQ_TYPE_ARM_SMMUV3 = 1, +}; + +/** + * struct iommu_virq_arm_smmuv3 - ARM SMMUv3 Virtual IRQ + * (IOMMU_VIRQ_TYPE_ARM_SMMUV3) + * @evt: 256-bit ARM SMMUv3 Event record, little-endian. + * + * StreamID field reports a virtual device ID. To receive a virtual IRQ for a + * device, a vDEVICE must be allocated via IOMMU_VDEVICE_ALLOC. + */ +struct iommu_virq_arm_smmuv3 { + __aligned_le64 evt[4]; }; /** diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c index 3a77eca949e6..e3ef77e0bffd 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c @@ -447,4 +447,20 @@ struct iommufd_viommu *arm_vsmmu_alloc(struct device *dev, return &vsmmu->core; } +int arm_vmaster_report_event(struct arm_smmu_vmaster *vmaster, u64 *evt) +{ + struct iommu_virq_arm_smmuv3 virq_data = + *(struct iommu_virq_arm_smmuv3 *)evt; + + virq_data.evt[0] &= ~EVTQ_0_SID; + virq_data.evt[0] |= FIELD_PREP(EVTQ_0_SID, vmaster->vsid); + + virq_data.evt[0] = cpu_to_le64(virq_data.evt[0]); + virq_data.evt[1] = cpu_to_le64(virq_data.evt[1]); + + return iommufd_viommu_report_irq(&vmaster->vsmmu->core, + IOMMU_VIRQ_TYPE_ARM_SMMUV3, &virq_data, + sizeof(virq_data)); +} + MODULE_IMPORT_NS(IOMMUFD); diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index 6a6113b36360..215c2d811eb7 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -1779,33 +1779,6 @@ static int arm_smmu_handle_evt(struct arm_smmu_device *smmu, u64 *evt) return -EOPNOTSUPP; } - if (!(evt[1] & EVTQ_1_STALL)) - return -EOPNOTSUPP; - - if (evt[1] & EVTQ_1_RnW) - perm |= IOMMU_FAULT_PERM_READ; - else - perm |= IOMMU_FAULT_PERM_WRITE; - - if (evt[1] & EVTQ_1_InD) - perm |= IOMMU_FAULT_PERM_EXEC; - - if (evt[1] & EVTQ_1_PnU) - perm |= IOMMU_FAULT_PERM_PRIV; - - flt->type = IOMMU_FAULT_PAGE_REQ; - flt->prm = (struct iommu_fault_page_request) { - .flags = IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE, - .grpid = FIELD_GET(EVTQ_1_STAG, evt[1]), - .perm = perm, - .addr = FIELD_GET(EVTQ_2_ADDR, evt[2]), - }; - - if (ssid_valid) { - flt->prm.flags |= IOMMU_FAULT_PAGE_REQUEST_PASID_VALID; - flt->prm.pasid = FIELD_GET(EVTQ_0_SSID, evt[0]); - } - mutex_lock(&smmu->streams_mutex); master = arm_smmu_find_master(smmu, sid); if (!master) { @@ -1813,7 +1786,40 @@ static int arm_smmu_handle_evt(struct arm_smmu_device *smmu, u64 *evt) goto out_unlock; } - ret = iommu_report_device_fault(master->dev, &fault_evt); + down_read(&master->vmaster_rwsem); + if (evt[1] & EVTQ_1_STALL) { + if (evt[1] & EVTQ_1_RnW) + perm |= IOMMU_FAULT_PERM_READ; + else + perm |= IOMMU_FAULT_PERM_WRITE; + + if (evt[1] & EVTQ_1_InD) + perm |= IOMMU_FAULT_PERM_EXEC; + + if (evt[1] & EVTQ_1_PnU) + perm |= IOMMU_FAULT_PERM_PRIV; + + flt->type = IOMMU_FAULT_PAGE_REQ; + flt->prm = (struct iommu_fault_page_request){ + .flags = IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE, + .grpid = FIELD_GET(EVTQ_1_STAG, evt[1]), + .perm = perm, + .addr = FIELD_GET(EVTQ_2_ADDR, evt[2]), + }; + + if (ssid_valid) { + flt->prm.flags |= IOMMU_FAULT_PAGE_REQUEST_PASID_VALID; + flt->prm.pasid = FIELD_GET(EVTQ_0_SSID, evt[0]); + } + + ret = iommu_report_device_fault(master->dev, &fault_evt); + } else if (master->vmaster && !(evt[1] & EVTQ_1_S2)) { + ret = arm_vmaster_report_event(master->vmaster, evt); + } else { + /* Unhandled events should be pinned */ + ret = -EFAULT; + } + up_read(&master->vmaster_rwsem); out_unlock: mutex_unlock(&smmu->streams_mutex); return ret;