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Tue, 20 Aug 2019 01:52:04 +0000 From: Dexuan Cui To: "linux-hyperv@vger.kernel.org" , "gregkh@linuxfoundation.org" , Stephen Hemminger , Sasha Levin , "sashal@kernel.org" , Haiyang Zhang , KY Srinivasan , Michael Kelley , "tglx@linutronix.de" CC: "linux-kernel@vger.kernel.org" , Dexuan Cui Subject: [PATCH v3 07/12] Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for hibernation Thread-Topic: [PATCH v3 07/12] Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for hibernation Thread-Index: AQHVVvndaVzztvpnS0CmvODgNbf61Q== Date: Tue, 20 Aug 2019 01:52:04 +0000 Message-ID: <1566265863-21252-8-git-send-email-decui@microsoft.com> References: <1566265863-21252-1-git-send-email-decui@microsoft.com> In-Reply-To: <1566265863-21252-1-git-send-email-decui@microsoft.com> Reply-To: Dexuan Cui Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MWHPR21CA0056.namprd21.prod.outlook.com (2603:10b6:300:db::18) To SN6PR2101MB0942.namprd21.prod.outlook.com (2603:10b6:805:4::19) authentication-results: spf=none (sender IP is ) smtp.mailfrom=decui@microsoft.com; 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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: 3u3Df+zgCKn5aFtHewcn0DOK9LTYBSXLbDOLKh+Yk7uRTUzLYOjf/gQns7oW3qP28UTqREiDgCmSmAr1hxZYnEP0fwBhCiNl1cqZwV4q/IWBpkI3lBIfdLNirQfFE6iyaAcCNj75b1J5wgoxJzAyJ0SGdBuM5VlN/11SLLnFTK2qYEG/YsyPni0S1H/sly7PPOoHDVpiaxBO1lpeNePMlPUsLLqZM42RP/ZQXZ0UeEfRl2mWEBgXMS/qVAX9tjdkHNlmbE7reNu9V/WFQmGsa1peEmoXB3Xe1liOt9aqgqZ3608SDDNyOlvdLa3EAdw8SX4uprRrMd+kCG5xWni18pzkSVJbiOOPN3xzsqRC1CfElT4EFV+i0u+5k1DHRWGiqr9HthRejg1CVEHlLRH0X5WBTY4FAs8ElPvFILzmoq0= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 54d62b02-fe18-4e13-936f-08d72510ffe0 X-MS-Exchange-CrossTenant-originalarrivaltime: 20 Aug 2019 01:52:04.0703 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: XkoC7/PQCXawOEfYXH+Te94e0lxDOU4ZNxwPcrZA9Z1meRrY/0ZlqlZv/OpiNecGYYqxJHdla0CJpf16HkpK3g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR2101MB1133 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The high-level VSC drivers will implement device-specific callbacks. Signed-off-by: Dexuan Cui Reviewed-by: Michael Kelley --- drivers/hv/vmbus_drv.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ include/linux/hyperv.h | 3 +++ 2 files changed, 49 insertions(+) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 2ef375c..a30c70a 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -911,6 +911,43 @@ static void vmbus_shutdown(struct device *child_device= ) drv->shutdown(dev); } =20 +/* + * vmbus_suspend - Suspend a vmbus device + */ +static int vmbus_suspend(struct device *child_device) +{ + struct hv_driver *drv; + struct hv_device *dev =3D device_to_hv_device(child_device); + + /* The device may not be attached yet */ + if (!child_device->driver) + return 0; + + drv =3D drv_to_hv_drv(child_device->driver); + if (!drv->suspend) + return -EOPNOTSUPP; + + return drv->suspend(dev); +} + +/* + * vmbus_resume - Resume a vmbus device + */ +static int vmbus_resume(struct device *child_device) +{ + struct hv_driver *drv; + struct hv_device *dev =3D device_to_hv_device(child_device); + + /* The device may not be attached yet */ + if (!child_device->driver) + return 0; + + drv =3D drv_to_hv_drv(child_device->driver); + if (!drv->resume) + return -EOPNOTSUPP; + + return drv->resume(dev); +} =20 /* * vmbus_device_release - Final callback release of the vmbus child device @@ -926,6 +963,14 @@ static void vmbus_device_release(struct device *device= ) kfree(hv_dev); } =20 +/* + * Note: we must use SET_NOIRQ_SYSTEM_SLEEP_PM_OPS rather than + * SET_SYSTEM_SLEEP_PM_OPS: see the comment before vmbus_bus_pm. + */ +static const struct dev_pm_ops vmbus_pm =3D { + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(vmbus_suspend, vmbus_resume) +}; + /* The one and only one */ static struct bus_type hv_bus =3D { .name =3D "vmbus", @@ -936,6 +981,7 @@ static void vmbus_device_release(struct device *device) .uevent =3D vmbus_uevent, .dev_groups =3D vmbus_dev_groups, .drv_groups =3D vmbus_drv_groups, + .pm =3D &vmbus_pm, }; =20 struct onmessage_work_context { diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 2d39248..8a60e77 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1157,6 +1157,9 @@ struct hv_driver { int (*remove)(struct hv_device *); void (*shutdown)(struct hv_device *); =20 + int (*suspend)(struct hv_device *); + int (*resume)(struct hv_device *); + }; =20 /* Base device object */ --=20 1.8.3.1