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Sun, 5 Jun 2022 23:19:59 -0700 From: Nicolin Chen To: , , , , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH 4/5] vfio/iommu_type1: Clean up update_dirty_scope in detach_group() Date: Sun, 5 Jun 2022 23:19:26 -0700 Message-ID: <20220606061927.26049-5-nicolinc@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220606061927.26049-1-nicolinc@nvidia.com> References: <20220606061927.26049-1-nicolinc@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: dec089d7-760e-4a1c-a1ee-08da478497fd X-MS-TrafficTypeDiagnostic: LV2PR12MB5848:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.234;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230001)(4636009)(46966006)(36840700001)(40470700004)(186003)(336012)(426003)(2616005)(47076005)(316002)(1076003)(70206006)(54906003)(83380400001)(110136005)(70586007)(6666004)(2906002)(7696005)(15650500001)(36756003)(508600001)(8936002)(7406005)(7416002)(40460700003)(4326008)(26005)(5660300002)(82310400005)(8676002)(36860700001)(86362001)(81166007)(356005)(921005)(14143004)(36900700001)(2101003)(83996005);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Jun 2022 06:20:03.6489 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: dec089d7-760e-4a1c-a1ee-08da478497fd X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.234];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT015.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB5848 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220605_233430_110261_EAE6389A X-CRM114-Status: GOOD ( 12.10 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org All devices in emulated_iommu_groups have pinned_page_dirty_scope set, so the update_dirty_scope in the first list_for_each_entry is always false. Clean it up, and move the "if update_dirty_scope" part from the detach_group_done routine to the domain_list part. Rename the "detach_group_done" goto label accordingly. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/vfio/vfio_iommu_type1.c | 27 ++++++++++++--------------- 1 file changed, 12 insertions(+), 15 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index f4e3b423a453..b45b1cc118ef 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -2463,14 +2463,12 @@ static void vfio_iommu_type1_detach_group(void *iommu_data, struct vfio_iommu *iommu = iommu_data; struct vfio_domain *domain; struct vfio_iommu_group *group; - bool update_dirty_scope = false; LIST_HEAD(iova_copy); mutex_lock(&iommu->lock); list_for_each_entry(group, &iommu->emulated_iommu_groups, next) { if (group->iommu_group != iommu_group) continue; - update_dirty_scope = !group->pinned_page_dirty_scope; list_del(&group->next); kfree(group); @@ -2479,7 +2477,7 @@ static void vfio_iommu_type1_detach_group(void *iommu_data, WARN_ON(iommu->notifier.head); vfio_iommu_unmap_unpin_all(iommu); } - goto detach_group_done; + goto out_unlock; } /* @@ -2495,9 +2493,7 @@ static void vfio_iommu_type1_detach_group(void *iommu_data, continue; iommu_detach_group(domain->domain, group->iommu_group); - update_dirty_scope = !group->pinned_page_dirty_scope; list_del(&group->next); - kfree(group); /* * Group ownership provides privilege, if the group list is * empty, the domain goes away. If it's the last domain with @@ -2519,7 +2515,17 @@ static void vfio_iommu_type1_detach_group(void *iommu_data, kfree(domain); vfio_iommu_aper_expand(iommu, &iova_copy); vfio_update_pgsize_bitmap(iommu); + /* + * Removal of a group without dirty tracking may allow + * the iommu scope to be promoted. + */ + if (!group->pinned_page_dirty_scope) { + iommu->num_non_pinned_groups--; + if (iommu->dirty_page_tracking) + vfio_iommu_populate_bitmap_full(iommu); + } } + kfree(group); break; } @@ -2528,16 +2534,7 @@ static void vfio_iommu_type1_detach_group(void *iommu_data, else vfio_iommu_iova_free(&iova_copy); -detach_group_done: - /* - * Removal of a group without dirty tracking may allow the iommu scope - * to be promoted. - */ - if (update_dirty_scope) { - iommu->num_non_pinned_groups--; - if (iommu->dirty_page_tracking) - vfio_iommu_populate_bitmap_full(iommu); - } +out_unlock: mutex_unlock(&iommu->lock); }