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Wed, 31 Jul 2019 17:52:07 +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 v2 7/7] Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for hibernation Thread-Topic: [PATCH v2 7/7] Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for hibernation Thread-Index: AQHVR8irVHxoPGRIEkOkK4NNsUPg/Q== Date: Wed, 31 Jul 2019 17:52:07 +0000 Message-ID: <1564595464-56520-8-git-send-email-decui@microsoft.com> References: <1564595464-56520-1-git-send-email-decui@microsoft.com> In-Reply-To: <1564595464-56520-1-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: MWHPR1301CA0011.namprd13.prod.outlook.com (2603:10b6:301:29::24) 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: 1pOXJUSAlfu/WmDCZCWpJ89CBY7Aw1rf91LAXszNPlGTseU/yyWHJxyRH9A39huItgGRI40LJCIUn+O22f02xDWVV6HFiuaqBsL3Z5XosUTBUhbB9YPd6Ek+s0S5CnVxuWBsfPz2wwjE44yDppMluEqNd4aJ1qYI7HGW9XaQHYJInZ8NS4khi49R/RsMLf4L1Ls16Uz5+bHFl3VdYx9K0+qHjVVxenoaHMqHMBJ+yIVZM1n88V0C3vMokauRhD31SmJ7PATyiUkIsBefDBR7OeQ1jnQN4xQ/QKBau5W4NKn/J7Mdq7CzWC/nK1qnrRjfpTG4I3dK3LKsn81Q/3Tx9WcQAgtTu9AdEqYlON8bfUHHI/ZQI/f6G34cU2Wpitm3hCAxBoivTDmtgtHiRetXpUYSXh6ckHdgCKo2OlKrmQM= 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: 8bd7953c-4f09-4984-081c-08d715dfcdf5 X-MS-Exchange-CrossTenant-originalarrivaltime: 31 Jul 2019 17:52:07.5211 (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: 0NldUL/i0cFXIVk7ydSZwMAPu35f4Z9GBVdQkJ2EWqQlqb5eDc/SmvwMGDgt57I5KY2FZcs4bpjAaapCG/eYAg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR2101MB1085 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 | 42 ++++++++++++++++++++++++++++++++++++++++++ include/linux/hyperv.h | 3 +++ 2 files changed, 45 insertions(+) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index ca6f4c8..337ecce 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 +963,10 @@ static void vmbus_device_release(struct device *device= ) kfree(hv_dev); } =20 +static const struct dev_pm_ops vmbus_pm =3D { + SET_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 +977,7 @@ 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 6256cc3..94443c4 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1149,6 +1149,9 @@ 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