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Thu, 29 Jul 2021 00:49:28 +0000 Received: from BL0PR12MB5506.namprd12.prod.outlook.com ([fe80::d017:af2f:7049:5482]) by BL0PR12MB5506.namprd12.prod.outlook.com ([fe80::d017:af2f:7049:5482%5]) with mapi id 15.20.4373.019; Thu, 29 Jul 2021 00:49:28 +0000 From: Jason Gunthorpe To: David Airlie , Tony Krowiak , Alex Williamson , Christian Borntraeger , Cornelia Huck , Jonathan Corbet , Daniel Vetter , Diana Craciun , dri-devel@lists.freedesktop.org, Eric Auger , Eric Farman , Harald Freudenberger , Vasily Gorbik , Heiko Carstens , intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, Jani Nikula , Jason Herne , Joonas Lahtinen , kvm@vger.kernel.org, Kirti Wankhede , linux-doc@vger.kernel.org, linux-s390@vger.kernel.org, Matthew Rosato , Peter Oberparleiter , Halil Pasic , Rodrigo Vivi , Vineeth Vijayan , Zhi Wang Cc: "Raj, Ashok" , Christoph Hellwig , Leon Romanovsky , Max Gurtovoy , Yishai Hadas , Zhenyu Wang Subject: [PATCH v3 07/14] vfio/platform: Use open_device() instead of open coding a refcnt scheme Date: Wed, 28 Jul 2021 21:49:16 -0300 Message-Id: <7-v3-6c9e19cc7d44+15613-vfio_reflck_jgg@nvidia.com> In-Reply-To: <0-v3-6c9e19cc7d44+15613-vfio_reflck_jgg@nvidia.com> References: Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: YT2PR01CA0002.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:38::7) To BL0PR12MB5506.namprd12.prod.outlook.com (2603:10b6:208:1cb::22) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from mlx.ziepe.ca (206.223.160.26) by YT2PR01CA0002.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:38::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4373.20 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?LZ+AzuBeSJm1LLDt40aJY+T3/l+MpAam7iGA/r1ebE/MJEJToZ4cAMo9wxZQ?= =?us-ascii?Q?BkDFBLREcDVrmiOMlyMROAUEVdVnKmBrhqJg7tLq7OZ0oDXjgKYZt8K8Xalm?= =?us-ascii?Q?UiZJEXZgHJ7Pq7pkwE+9idH1jULIGXf1RbFZOjqJ/Yg/95WPuGh+msnxHiQw?= =?us-ascii?Q?xI19yRmi5MU/xMENkO1S7xHCYsrKmwAHA9K0YYij+gJiwJRRRfXDm55USu+k?= =?us-ascii?Q?/+mpLZ+bWlpj9iUvBYZJbD8Al12alUyFj1NnY+sV14oYNapRMzI2KXHEyK44?= =?us-ascii?Q?G29WTBDDlm76MQIYucYD/OTMRxn9mmde+N9kvVdaj3iNXr0GkVTeDiVu/NpV?= =?us-ascii?Q?YMmMnfrhjrTWLBm7K81HqpM5aMVDY3UZKq6H57LagXXkR4xlOR3GEMKL2+3a?= =?us-ascii?Q?9Pv8XgL/lZi6VcO4bhBWInW4DZh8tnau7LjDo13e2hl1n4QBBTMNQ2BpCOiA?= =?us-ascii?Q?isvmI85G94BKrjvZkDwMpQYGHHt/52EXaI/8DVwEm6GE/yPLDnZctnKf9VGL?= =?us-ascii?Q?RMWDYXmND6PfDh/sdNyo08cyygRDHTbsBOylJzPR29gqVeooKWQ+oxDfbx4M?= =?us-ascii?Q?1Hp4EJyvI8LuVXu3JuFcA2ChYqirM4rpuLHrvfs338XA94/Y1tQNvvB2U2DI?= =?us-ascii?Q?Cy0B44Chy4XXVG66lI6O/AF+JiacYbO8iTaVnl/shLmdGptN0yBa41Jv/sRA?= =?us-ascii?Q?hab48XF+jDuelHqjPcdVPKNxcMkJIwLYRHx6HPI+m6LTMuHyEnjDv1jMI/n9?= =?us-ascii?Q?Q/OhI7m6Uba+Nss6rpzTqD+4VgHhFzbi02EgmKsmoo0clwNlqKiH0QRskdHa?= =?us-ascii?Q?EqAVhe+jvroAmSfAnRJJ4rC2HvnAM9LgXMVGI7St3TN18rgqoT4zaXdLHR0Y?= =?us-ascii?Q?r/j+if9ne6JHtGeho04YOtQldMTjt/I5fW/AwO4vE2dxuQ+T63Iy+AYAbJWl?= =?us-ascii?Q?4Y7wfVj9HQvGjwrUzLCx/NCsXOBSFerjePn2KSIWKn8+dL47QF7hZYIntitE?= =?us-ascii?Q?B6T0k7asSSu6msBQD7e5o1GFaUaHzlKy296T4iYNDaz2w/KQR213IECI0pGg?= =?us-ascii?Q?NHnlwvKpORTpuc0XjPdlaPkB7w0PFRyAka1AeR1fhMbVSylWl3Zl4/L0l7oO?= =?us-ascii?Q?G62V/Tr4XZmSsBsOaaudJcx4heB90HXxb9AGdSjgxltnQnI4ognFIhXISbvZ?= =?us-ascii?Q?3ub2Tqa8KqpIMLAWXenFiwinq9YvUl+w7QukMrv+YqKNkmxQ75egF1FLBfM1?= =?us-ascii?Q?xuYK2A8oXxUfpMaf68sdCJTt1JX1H7xlKtCtEgD81oLk7bRGVvzKPLNwinp8?= =?us-ascii?Q?pwj4pdEXnRqXTCSQbR8TeXxN?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: b855d8cb-1847-475a-49a7-08d9522ab6e3 X-MS-Exchange-CrossTenant-AuthSource: BL0PR12MB5506.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Jul 2021 00:49:26.1552 (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: daxolzDYc2BtU5xeJEHE5kUdoYL/+iYMt9y89EUTVjwbp+kwadWGrt1ztDx6Hajc X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5160 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Platform simply wants to run some code when the device is first opened/last closed. Use the core framework and locking for this. Aside from removing a bit of code this narrows the locking scope from a global lock. Signed-off-by: Jason Gunthorpe Signed-off-by: Yishai Hadas Reviewed-by: Cornelia Huck Reviewed-by: Christoph Hellwig --- drivers/vfio/platform/vfio_platform_common.c | 79 ++++++++----------- drivers/vfio/platform/vfio_platform_private.h | 1 - 2 files changed, 32 insertions(+), 48 deletions(-) diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c index bdde8605178cd2..6af7ce7d619c25 100644 --- a/drivers/vfio/platform/vfio_platform_common.c +++ b/drivers/vfio/platform/vfio_platform_common.c @@ -218,65 +218,52 @@ static int vfio_platform_call_reset(struct vfio_platform_device *vdev, return -EINVAL; } -static void vfio_platform_release(struct vfio_device *core_vdev) +static void vfio_platform_close_device(struct vfio_device *core_vdev) { struct vfio_platform_device *vdev = container_of(core_vdev, struct vfio_platform_device, vdev); + const char *extra_dbg = NULL; + int ret; - mutex_lock(&driver_lock); - - if (!(--vdev->refcnt)) { - const char *extra_dbg = NULL; - int ret; - - ret = vfio_platform_call_reset(vdev, &extra_dbg); - if (ret && vdev->reset_required) { - dev_warn(vdev->device, "reset driver is required and reset call failed in release (%d) %s\n", - ret, extra_dbg ? extra_dbg : ""); - WARN_ON(1); - } - pm_runtime_put(vdev->device); - vfio_platform_regions_cleanup(vdev); - vfio_platform_irq_cleanup(vdev); + ret = vfio_platform_call_reset(vdev, &extra_dbg); + if (WARN_ON(ret && vdev->reset_required)) { + dev_warn( + vdev->device, + "reset driver is required and reset call failed in release (%d) %s\n", + ret, extra_dbg ? extra_dbg : ""); } - - mutex_unlock(&driver_lock); + pm_runtime_put(vdev->device); + vfio_platform_regions_cleanup(vdev); + vfio_platform_irq_cleanup(vdev); } -static int vfio_platform_open(struct vfio_device *core_vdev) +static int vfio_platform_open_device(struct vfio_device *core_vdev) { struct vfio_platform_device *vdev = container_of(core_vdev, struct vfio_platform_device, vdev); + const char *extra_dbg = NULL; int ret; - mutex_lock(&driver_lock); - - if (!vdev->refcnt) { - const char *extra_dbg = NULL; - - ret = vfio_platform_regions_init(vdev); - if (ret) - goto err_reg; + ret = vfio_platform_regions_init(vdev); + if (ret) + return ret; - ret = vfio_platform_irq_init(vdev); - if (ret) - goto err_irq; + ret = vfio_platform_irq_init(vdev); + if (ret) + goto err_irq; - ret = pm_runtime_get_sync(vdev->device); - if (ret < 0) - goto err_rst; + ret = pm_runtime_get_sync(vdev->device); + if (ret < 0) + goto err_rst; - ret = vfio_platform_call_reset(vdev, &extra_dbg); - if (ret && vdev->reset_required) { - dev_warn(vdev->device, "reset driver is required and reset call failed in open (%d) %s\n", - ret, extra_dbg ? extra_dbg : ""); - goto err_rst; - } + ret = vfio_platform_call_reset(vdev, &extra_dbg); + if (ret && vdev->reset_required) { + dev_warn( + vdev->device, + "reset driver is required and reset call failed in open (%d) %s\n", + ret, extra_dbg ? extra_dbg : ""); + goto err_rst; } - - vdev->refcnt++; - - mutex_unlock(&driver_lock); return 0; err_rst: @@ -284,8 +271,6 @@ static int vfio_platform_open(struct vfio_device *core_vdev) vfio_platform_irq_cleanup(vdev); err_irq: vfio_platform_regions_cleanup(vdev); -err_reg: - mutex_unlock(&driver_lock); return ret; } @@ -616,8 +601,8 @@ static int vfio_platform_mmap(struct vfio_device *core_vdev, struct vm_area_stru static const struct vfio_device_ops vfio_platform_ops = { .name = "vfio-platform", - .open = vfio_platform_open, - .release = vfio_platform_release, + .open_device = vfio_platform_open_device, + .close_device = vfio_platform_close_device, .ioctl = vfio_platform_ioctl, .read = vfio_platform_read, .write = vfio_platform_write, diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h index dfb834c1365946..520d2a8e8375b2 100644 --- a/drivers/vfio/platform/vfio_platform_private.h +++ b/drivers/vfio/platform/vfio_platform_private.h @@ -48,7 +48,6 @@ struct vfio_platform_device { u32 num_regions; struct vfio_platform_irq *irqs; u32 num_irqs; - int refcnt; struct mutex igate; const char *compat; const char *acpihid; -- 2.32.0