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From:   Dexuan Cui <decui@microsoft.com>
To:     "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
        "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>,
        "sashal@kernel.org" <sashal@kernel.org>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        KY Srinivasan <kys@microsoft.com>,
        Michael Kelley <mikelley@microsoft.com>,
        "tglx@linutronix.de" <tglx@linutronix.de>
CC:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Dexuan Cui <decui@microsoft.com>
Subject: [PATCH v4 07/12] Drivers: hv: vmbus: Implement suspend/resume for VSC
 drivers for hibernation
Thread-Topic: [PATCH v4 07/12] Drivers: hv: vmbus: Implement suspend/resume
 for VSC drivers for hibernation
Thread-Index: AQHVYe3Lq151OnHmPEO0ia4skdvz/A==
Date:   Tue, 3 Sep 2019 00:23:22 +0000
Message-ID: <1567470139-119355-8-git-send-email-decui@microsoft.com>
References: <1567470139-119355-1-git-send-email-decui@microsoft.com>
In-Reply-To: <1567470139-119355-1-git-send-email-decui@microsoft.com>
Reply-To: Dexuan Cui <decui@microsoft.com>
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The high-level VSC drivers will implement device-specific callbacks.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
---
 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