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Sun, 20 Feb 2022 01:59:26 -0800 From: Yishai Hadas To: , , , CC: , , , , , , , , , , , , Subject: [PATCH V8 mlx5-next 15/15] vfio/mlx5: Use its own PCI reset_done error handler Date: Sun, 20 Feb 2022 11:57:16 +0200 Message-ID: <20220220095716.153757-16-yishaih@nvidia.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20220220095716.153757-1-yishaih@nvidia.com> References: <20220220095716.153757-1-yishaih@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 9ef1f248-14a3-4d62-1311-08d9f457b554 X-MS-TrafficTypeDiagnostic: DM4PR12MB5890: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:12.22.5.236;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230001)(4636009)(46966006)(40470700004)(36840700001)(8936002)(110136005)(316002)(47076005)(6636002)(54906003)(508600001)(36756003)(5660300002)(8676002)(4326008)(6666004)(7696005)(7416002)(70586007)(70206006)(83380400001)(82310400004)(2906002)(426003)(2616005)(1076003)(336012)(186003)(26005)(36860700001)(81166007)(86362001)(40460700003)(356005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Feb 2022 09:59:39.0060 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9ef1f248-14a3-4d62-1311-08d9f457b554 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.236];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT034.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5890 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Register its own handler for pci_error_handlers.reset_done and update state accordingly. Signed-off-by: Yishai Hadas Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe --- drivers/vfio/pci/mlx5/main.c | 57 ++++++++++++++++++++++++++++++++++-- 1 file changed, 55 insertions(+), 2 deletions(-) diff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c index 2be78cc78928..046d5ff6f1f4 100644 --- a/drivers/vfio/pci/mlx5/main.c +++ b/drivers/vfio/pci/mlx5/main.c @@ -29,9 +29,12 @@ struct mlx5vf_pci_core_device { struct vfio_pci_core_device core_device; u16 vhca_id; u8 migrate_cap:1; + u8 deferred_reset:1; /* protect migration state */ struct mutex state_mutex; enum vfio_device_mig_state mig_state; + /* protect the reset_done flow */ + spinlock_t reset_lock; struct mlx5_vf_migration_file *resuming_migf; struct mlx5_vf_migration_file *saving_migf; }; @@ -437,6 +440,25 @@ mlx5vf_pci_step_device_state_locked(struct mlx5vf_pci_core_device *mvdev, return ERR_PTR(-EINVAL); } +/* + * This function is called in all state_mutex unlock cases to + * handle a 'deferred_reset' if exists. + */ +static void mlx5vf_state_mutex_unlock(struct mlx5vf_pci_core_device *mvdev) +{ +again: + spin_lock(&mvdev->reset_lock); + if (mvdev->deferred_reset) { + mvdev->deferred_reset = false; + spin_unlock(&mvdev->reset_lock); + mvdev->mig_state = VFIO_DEVICE_STATE_RUNNING; + mlx5vf_disable_fds(mvdev); + goto again; + } + mutex_unlock(&mvdev->state_mutex); + spin_unlock(&mvdev->reset_lock); +} + static struct file * mlx5vf_pci_set_device_state(struct vfio_device *vdev, enum vfio_device_mig_state new_state) @@ -465,7 +487,7 @@ mlx5vf_pci_set_device_state(struct vfio_device *vdev, break; } } - mutex_unlock(&mvdev->state_mutex); + mlx5vf_state_mutex_unlock(mvdev); return res; } @@ -477,10 +499,34 @@ static int mlx5vf_pci_get_device_state(struct vfio_device *vdev, mutex_lock(&mvdev->state_mutex); *curr_state = mvdev->mig_state; - mutex_unlock(&mvdev->state_mutex); + mlx5vf_state_mutex_unlock(mvdev); return 0; } +static void mlx5vf_pci_aer_reset_done(struct pci_dev *pdev) +{ + struct mlx5vf_pci_core_device *mvdev = dev_get_drvdata(&pdev->dev); + + if (!mvdev->migrate_cap) + return; + + /* + * As the higher VFIO layers are holding locks across reset and using + * those same locks with the mm_lock we need to prevent ABBA deadlock + * with the state_mutex and mm_lock. + * In case the state_mutex was taken already we defer the cleanup work + * to the unlock flow of the other running context. + */ + spin_lock(&mvdev->reset_lock); + mvdev->deferred_reset = true; + if (!mutex_trylock(&mvdev->state_mutex)) { + spin_unlock(&mvdev->reset_lock); + return; + } + spin_unlock(&mvdev->reset_lock); + mlx5vf_state_mutex_unlock(mvdev); +} + static int mlx5vf_pci_open_device(struct vfio_device *core_vdev) { struct mlx5vf_pci_core_device *mvdev = container_of( @@ -562,6 +608,7 @@ static int mlx5vf_pci_probe(struct pci_dev *pdev, VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P; mutex_init(&mvdev->state_mutex); + spin_lock_init(&mvdev->reset_lock); } mlx5_vf_put_core_dev(mdev); } @@ -596,11 +643,17 @@ static const struct pci_device_id mlx5vf_pci_table[] = { MODULE_DEVICE_TABLE(pci, mlx5vf_pci_table); +static const struct pci_error_handlers mlx5vf_err_handlers = { + .reset_done = mlx5vf_pci_aer_reset_done, + .error_detected = vfio_pci_core_aer_err_detected, +}; + static struct pci_driver mlx5vf_pci_driver = { .name = KBUILD_MODNAME, .id_table = mlx5vf_pci_table, .probe = mlx5vf_pci_probe, .remove = mlx5vf_pci_remove, + .err_handler = &mlx5vf_err_handlers, }; static void __exit mlx5vf_pci_cleanup(void) -- 2.18.1