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Thu, 5 Sep 2019 23:01:18 +0000 From: Dexuan Cui To: "linux-hyperv@vger.kernel.org" , Stephen Hemminger , Sasha Levin , "sashal@kernel.org" , Haiyang Zhang , KY Srinivasan , Michael Kelley , "tglx@linutronix.de" CC: "gregkh@linuxfoundation.org" , "linux-kernel@vger.kernel.org" , Dexuan Cui Subject: [PATCH v5 4/9] Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for hibernation Thread-Topic: [PATCH v5 4/9] Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for hibernation Thread-Index: AQHVZD3TSgcM00JbJEK+uBOsXhhSqw== Date: Thu, 5 Sep 2019 23:01:17 +0000 Message-ID: <1567724446-30990-5-git-send-email-decui@microsoft.com> References: <1567724446-30990-1-git-send-email-decui@microsoft.com> In-Reply-To: <1567724446-30990-1-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: MWHPR0201CA0048.namprd02.prod.outlook.com (2603:10b6:301:73::25) 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: eBkjgtsoTrAmFajFGAmvmZdJy/mTUFEVEo5CrifZjkJI/DWX/y6yI5H1LeREIRT9W3ymXkP5ibi4mYWuhO0xzG36QqSyzU+BgGoa6EXR/RkaAA7J+gEHoLFy1aHHwLx96Tuck6JRQR6pFt+ZtIzplX4px3E/Nzxp+ichhorb/WR8YQQateANnkxbv7aF6qx1j5jRqxZRqtI/fJ8NXdd9MS70rFhLL+1R+SfEiVJ/IetfT6fLhTY+HeD1Vb/3XAWmcVvTqHyMviTtdE2I2DeVFO44iYpG8glO07M+DISgjJgp59KRC/3FVObZEW6F5znnmmBX/ILyfvrkqXJO07H4noRqVBpdWEWAiMNGIX6LPqTk/b/Rv1nItS72zP8No9qyr31yijpyjbllfX5zh7SRB6CzPC25xH7rDbhPgLK/PLk= 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: dfbd3e97-ef3c-4686-737f-08d73254f5a9 X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Sep 2019 23:01:17.7798 (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: e3FcxON5OOXvuS3mUL1cBwOSIoCS1tIsCFk4iBdre7iLZrTZjL6hs35+3M0aZj1rwCVh9pF85gxKS7/RGvguVA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR2101MB1038 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