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Mon, 27 Mar 2023 18:38:13 +0000 Received: from LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::ef6d:fdf6:352f:efd1]) by LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::ef6d:fdf6:352f:efd1%3]) with mapi id 15.20.6178.037; Mon, 27 Mar 2023 18:38:13 +0000 From: Jason Gunthorpe To: iommu@lists.linux.dev, Kevin Tian , linux-kselftest@vger.kernel.org Cc: Lu Baolu , kvm@vger.kernel.org, Nicolin Chen , Yi Liu Subject: [PATCH v4 05/17] iommufd: Keep track of each device's reserved regions instead of groups Date: Mon, 27 Mar 2023 15:37:59 -0300 Message-Id: <5-v4-9cd79ad52ee8+13f5-iommufd_alloc_jgg@nvidia.com> In-Reply-To: <0-v4-9cd79ad52ee8+13f5-iommufd_alloc_jgg@nvidia.com> References: X-ClientProxiedBy: YT4PR01CA0386.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:108::7) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|SJ2PR12MB9008:EE_ X-MS-Office365-Filtering-Correlation-Id: 9af7718d-01a7-4040-761d-08db2ef26b6b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9af7718d-01a7-4040-761d-08db2ef26b6b X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Mar 2023 18:38:12.4256 (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: JWl+M0/mL6n8K8/uj8ws+twdi+ufUmrRayY2gSZoF8Q9LbLnpfCKPoZo7z0qTANZ X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB9008 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 58ad98de1914dd..112b6c541c47e4 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 2ff192777f27d3..22863759c3bfb0 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,