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Mon, 15 May 2023 14:00:37 +0000 Received: from LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::f7a7:a561:87e9:5fab]) by LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::f7a7:a561:87e9:5fab%6]) with mapi id 15.20.6387.030; Mon, 15 May 2023 14:00:37 +0000 From: Jason Gunthorpe To: iommu@lists.linux.dev, linux-kselftest@vger.kernel.org Cc: Lu Baolu , Kevin Tian , kvm@vger.kernel.org, Lixiao Yang , Matthew Rosato , Nicolin Chen , Yi Liu Subject: [PATCH v7 05/19] iommufd: Keep track of each device's reserved regions instead of groups Date: Mon, 15 May 2023 11:00:20 -0300 Message-Id: <5-v7-6c0fd698eda2+5e3-iommufd_alloc_jgg@nvidia.com> In-Reply-To: <0-v7-6c0fd698eda2+5e3-iommufd_alloc_jgg@nvidia.com> References: X-ClientProxiedBy: BLAPR03CA0014.namprd03.prod.outlook.com (2603:10b6:208:32b::19) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|SN7PR12MB7954:EE_ X-MS-Office365-Filtering-Correlation-Id: 43a3c00c-4363-402d-e2bb-08db554cc14a 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: GnBbKIC+47QYXIc4o9KEzxKC5SZP5cH7k3qvn0YDc6ybP7GASz/vvuGd1+geCh8DBtinCvfk32mkMxlnNYGD20P/huXr/CVi7HYxe/VMSlXZmQ8NqoC+kBKnKBgsr7gnwGkzSBFgL+ge9qQF/ojUxyAdvbFgL6L4tcX++gf/Nz+jtSKweZKGyVYZQ5sfrNAFjhp8G89HxA8jkYTzMSv5XdYYeSmBx+jJP2Aqh4fSK6/NQnMF0dKrUYDZK3UUfdc5K2vxZwh9GI/5R7+nTvNDbrp4S2VNss2etyFmMHBSW3VxWCmRY+OzqjazZzkyKo/2DN89tN8y1qXPilPqOR57JQSp8Kp0k7GT6Tege7jAj9YRRlgQGpfy3pWxzejNFeLWwSR8WUk8pbWpshbIOapC8Hg8qxImK3zDSQyKspGBCjOI/FNZgV4cOuRsERB4i5+kfXivgnlKdmypUDrknkbmLdNG5eIRXAo3zX6SMlQEWvFitWxV3Zhy9nam3HEnUtiZvcsv2EnMAkAYmLbagcOg4iFplKzI2uC9g9HCS7CeGbRTql3UAbi7UE/xUovicBgLytpJ/g8KvaxLJl7eK62SjJoOJ9VxqQfkkvoHhbRyKbq1EoVaEpiQX8EHkIDrRd8lk4O3ZcTNTdZhZHbrqm+5+G0npvrRr/0KifR40+ejFrlBnIPswnf+h/w2K+NxyyjRgGxxu5wvBlhNlVs1lIkdNI3AwN7qYeA2mfL5LsADBQfQMug+P03IcgF8BLEw2C2C2WWBCE+EMVitzLvFsBma/5jO4Thgum1GGSLx+LtZActikjR2Xa5VJILKq4sLvYdhVg8uUju3kc6pMem7s63yt3q01NBvAxNottP8oTWMe+VQVTMNdP/QLwZnvPAbb/bs4NCpIdMIggH5L0GNu5mDT0cGW4tKAZJ+hvX1WxniXVXz1MCbnthO4ZK7aJ13cU3e/X8kdGgrX6xB/KkPlwV8molCY4CtBFAWkI27IezHu1PaeMTyooIvViEXBAFybcjxGOC+kT8azJJZGv7tS6p1mO0YlETWAWDv1zHZcH3WxpUePkNgnnADnYWhn+4UCnafHn2fQta1V42B9rHQZJMXnWt4QTbezd0CZeXMG+zaHmy/gbiX8OTqJ/2Md5bsQL65GjdpGhg0Y7ZqF93Ja2y+fltN9wE+DoYN0+OvEtSylf2fhWzyBvzJIBBtZ+MBbvkQukmOHZKmh1idMxuPwpJ/r9QNdpmMZy2VzE7XQ5Yee3M1XwaREX2bC01WVA/o6uw07+I33BA44vDXVgPL8MKG/HrNJLCv7Bs2uMeAFBVMUwShnOFasnRWwOse7DI5w7TZ6yiWe9EQdaIoe6yN74cG1d45ScoD5Ly4l934EKIpVkEWA88ZicHyK9gSRgpkQBojlJVDK7dn/P7AW8tAy5rPhcJxVRteYYu89j6AVKuWn2xBZMg343y9AGQXBRxDQFfFwCW/pISYKBLPZNmmCXLl4Q6VXohmNtKc5Dhsl0p/oVIULSXwFKHKlWpLiBFjwFsKcEWG6Upd4CYfdh9BfpOF0iAlJDhZ2dikTZ9okSO9uHQmFTZ5dW/mJWPqIflxczcl X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 43a3c00c-4363-402d-e2bb-08db554cc14a X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 May 2023 14:00:35.3147 (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: m+qHiyAY/rLYRHtv8Vnali06SASLHqqngaSOZzfbxO/yM5ckZgmvMAhgucYKaoBM X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7954 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The driver facing API in the iommu core makes the reserved regions per-device. An algorithm in the core code consolidates the regions of all the devices in a group to return the group view. To allow for devices to be hotplugged into the group iommufd would re-load the entire group's reserved regions for each device, just in case they changed. Further iommufd already has to deal with duplicated/overlapping reserved regions as it must union all the groups together. Thus simplify all of this to just use the device reserved regions interface directly from the iommu driver. Suggested-by: Kevin Tian Reviewed-by: Lu Baolu Reviewed-by: Kevin Tian Signed-off-by: Jason Gunthorpe --- drivers/iommu/iommufd/device.c | 5 ++--- drivers/iommu/iommufd/io_pagetable.c | 27 ++++++++++--------------- drivers/iommu/iommufd/iommufd_private.h | 7 +++---- 3 files changed, 16 insertions(+), 23 deletions(-) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 23ebf2065e20de..cd8ded265495cc 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -313,9 +313,8 @@ int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt, } } - rc = iopt_table_enforce_group_resv_regions(&hwpt->ioas->iopt, idev->dev, - idev->igroup->group, - &sw_msi_start); + rc = iopt_table_enforce_dev_resv_regions( + &hwpt->ioas->iopt, idev->dev, &sw_msi_start); if (rc) goto err_unlock; diff --git a/drivers/iommu/iommufd/io_pagetable.c b/drivers/iommu/iommufd/io_pagetable.c index e0ae72b9e67f86..f842768b2e250b 100644 --- a/drivers/iommu/iommufd/io_pagetable.c +++ b/drivers/iommu/iommufd/io_pagetable.c @@ -1161,25 +1161,22 @@ void iopt_remove_access(struct io_pagetable *iopt, up_write(&iopt->domains_rwsem); } -/* Narrow the valid_iova_itree to include reserved ranges from a group. */ -int iopt_table_enforce_group_resv_regions(struct io_pagetable *iopt, - struct device *device, - struct iommu_group *group, - phys_addr_t *sw_msi_start) +/* Narrow the valid_iova_itree to include reserved ranges from a device. */ +int iopt_table_enforce_dev_resv_regions(struct io_pagetable *iopt, + struct device *dev, + phys_addr_t *sw_msi_start) { struct iommu_resv_region *resv; - struct iommu_resv_region *tmp; - LIST_HEAD(group_resv_regions); + LIST_HEAD(resv_regions); unsigned int num_hw_msi = 0; unsigned int num_sw_msi = 0; int rc; down_write(&iopt->iova_rwsem); - rc = iommu_get_group_resv_regions(group, &group_resv_regions); - if (rc) - goto out_unlock; + /* FIXME: drivers allocate memory but there is no failure propogated */ + iommu_get_resv_regions(dev, &resv_regions); - list_for_each_entry(resv, &group_resv_regions, list) { + list_for_each_entry(resv, &resv_regions, list) { if (resv->type == IOMMU_RESV_DIRECT_RELAXABLE) continue; @@ -1191,7 +1188,7 @@ int iopt_table_enforce_group_resv_regions(struct io_pagetable *iopt, } rc = iopt_reserve_iova(iopt, resv->start, - resv->length - 1 + resv->start, device); + resv->length - 1 + resv->start, dev); if (rc) goto out_reserved; } @@ -1206,11 +1203,9 @@ int iopt_table_enforce_group_resv_regions(struct io_pagetable *iopt, goto out_free_resv; out_reserved: - __iopt_remove_reserved_iova(iopt, device); + __iopt_remove_reserved_iova(iopt, dev); out_free_resv: - list_for_each_entry_safe(resv, tmp, &group_resv_regions, list) - kfree(resv); -out_unlock: + iommu_put_resv_regions(dev, &resv_regions); up_write(&iopt->iova_rwsem); return rc; } diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index e2eb1db5f8f8ce..d5c3c627c0dff3 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -76,10 +76,9 @@ int iopt_table_add_domain(struct io_pagetable *iopt, struct iommu_domain *domain); void iopt_table_remove_domain(struct io_pagetable *iopt, struct iommu_domain *domain); -int iopt_table_enforce_group_resv_regions(struct io_pagetable *iopt, - struct device *device, - struct iommu_group *group, - phys_addr_t *sw_msi_start); +int iopt_table_enforce_dev_resv_regions(struct io_pagetable *iopt, + struct device *dev, + phys_addr_t *sw_msi_start); int iopt_set_allow_iova(struct io_pagetable *iopt, struct rb_root_cached *allowed_iova); int iopt_reserve_iova(struct io_pagetable *iopt, unsigned long start,