Staging: hv: Cleanup root device handling

Now we can complete the cleanup of the root device
management - use the pci device as the root device for
all Hyper-V devices. As part of this cleanup get rid
of the root device object from vmbus_driver_context.
Signed-off-by: NK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: NHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: NMike Sterling <mike.sterling@microsoft.com>
Signed-off-by: NAbhishek Kane <v-abkane@microsoft.com>
Signed-off-by: NHank Janssen <hjanssen@microsoft.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/hv/vmbus_drv.c

@@ -44,13 +44,9 @@ struct pci_dev *hv_pci_dev;
 
 /* Main vmbus driver data structure */
 struct vmbus_driver_context {
-
 	struct bus_type bus;
 	struct tasklet_struct msg_dpc;
 	struct tasklet_struct event_dpc;
-
-	/* The bus root device */
-	struct hv_device device_ctx;
 };
 
 static int vmbus_match(struct device *device, struct device_driver *driver);
@@ -62,7 +58,6 @@ static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env);
 static irqreturn_t vmbus_isr(int irq, void *dev_id);
 
 static void vmbus_device_release(struct device *device);
-static void vmbus_bus_release(struct device *device);
 
 static ssize_t vmbus_show_device_attr(struct device *dev,
 				      struct device_attribute *dev_attr,
@@ -119,54 +114,6 @@ static struct vmbus_driver_context vmbus_drv = {
 
 static const char *driver_name = "hyperv";
 
-/*
- * Windows vmbus does not defined this.
- * We defined this to be consistent with other devices
- */
-/* {c5295816-f63a-4d5f-8d1a-4daf999ca185} */
-static const struct hv_guid device_type = {
-	.data = {
-		0x16, 0x58, 0x29, 0xc5, 0x3a, 0xf6, 0x5f, 0x4d,
-		0x8d, 0x1a, 0x4d, 0xaf, 0x99, 0x9c, 0xa1, 0x85
-	}
-};
-
-/* {ac3760fc-9adf-40aa-9427-a70ed6de95c5} */
-static const struct hv_guid device_id = {
-	.data = {
-		0xfc, 0x60, 0x37, 0xac, 0xdf, 0x9a, 0xaa, 0x40,
-		0x94, 0x27, 0xa7, 0x0e, 0xd6, 0xde, 0x95, 0xc5
-	}
-};
-
-static struct hv_device *vmbus_device; /* vmbus root device */
-
-
-/*
- * vmbus_dev_add - Callback when the root bus device is added
- */
-static int vmbus_dev_add(struct hv_device *dev, void *info)
-{
-	u32 *irqvector = info;
-	int ret;
-
-	vmbus_device = dev;
-
-	memcpy(&vmbus_device->dev_type, &device_type, sizeof(struct hv_guid));
-	memcpy(&vmbus_device->dev_instance, &device_id,
-	       sizeof(struct hv_guid));
-
-	/* strcpy(dev->name, "vmbus"); */
-	/* SynIC setup... */
-	on_each_cpu(hv_synic_init, (void *)irqvector, 1);
-
-	/* Connect to VMBus in the root partition */
-	ret = vmbus_connect();
-
-	/* VmbusSendEvent(device->localPortId+1); */
-	return ret;
-}
-
 
 struct onmessage_work_context {
 	struct work_struct work;
@@ -418,17 +365,13 @@ static ssize_t vmbus_show_device_attr(struct device *dev,
  *
  * Here, we
  *	- initialize the vmbus driver context
- *	- setup various driver entry points
  *	- invoke the vmbus hv main init routine
  *	- get the irq resource
- *	- invoke the vmbus to add the vmbus root device
- *	- setup the vmbus root device
  *	- retrieve the channel offers
  */
 static int vmbus_bus_init(void)
 {
 	struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
-	struct hv_device *dev_ctx = &vmbus_drv.device_ctx;
 	int ret;
 	unsigned int vector;
 
@@ -485,45 +428,19 @@ static int vmbus_bus_init(void)
 
 	DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
 
-	/* Add the root device */
-	memset(dev_ctx, 0, sizeof(struct hv_device));
-
-	ret = vmbus_dev_add(dev_ctx, &vector);
-	if (ret != 0) {
-		DPRINT_ERR(VMBUS_DRV,
-			   "ERROR - Unable to add vmbus root device");
-
-		free_irq(vmbus_irq, NULL);
-
-		bus_unregister(&vmbus_drv_ctx->bus);
-
-		ret = -1;
-		goto cleanup;
-	}
-	/* strcpy(dev_ctx->device.bus_id, dev_ctx->device_obj.name); */
-	dev_set_name(&dev_ctx->device, "vmbus_0_0");
-
-	/* No need to bind a driver to the root device. */
-	dev_ctx->device.parent = NULL;
-	/* NULL; vmbus_remove() does not get invoked */
-	dev_ctx->device.bus = &vmbus_drv_ctx->bus;
-
-	/* Setup the device dispatch table */
-	dev_ctx->device.release = vmbus_bus_release;
-
-	/* register the  root device */
-	ret = device_register(&dev_ctx->device);
+	/*
+	 * Notify the hypervisor of our irq and
+	 * connect to the host.
+	 */
+	on_each_cpu(hv_synic_init, (void *)&vector, 1);
+	ret = vmbus_connect();
 	if (ret) {
-		DPRINT_ERR(VMBUS_DRV,
-			   "ERROR - Unable to register vmbus root device");
-
 		free_irq(vmbus_irq, NULL);
 		bus_unregister(&vmbus_drv_ctx->bus);
-
-		ret = -1;
 		goto cleanup;
 	}
 
+
 	vmbus_request_offers();
 	wait_for_completion(&hv_channel_ready);
 
@@ -540,7 +457,6 @@ static void vmbus_bus_exit(void)
 {
 	struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
 
-	struct hv_device *dev_ctx = &vmbus_drv.device_ctx;
 
 	vmbus_release_unattached_channels();
 	vmbus_disconnect();
@@ -548,9 +464,6 @@ static void vmbus_bus_exit(void)
 
 	hv_cleanup();
 
-	/* Unregister the root bus device */
-	device_unregister(&dev_ctx->device);
-
 	bus_unregister(&vmbus_drv_ctx->bus);
 
 	free_irq(vmbus_irq, NULL);
@@ -674,7 +587,7 @@ int vmbus_child_device_register(struct hv_device *child_device_obj)
 
 	/* The new device belongs to this bus */
 	child_device_obj->device.bus = &vmbus_drv.bus; /* device->dev.bus; */
-	child_device_obj->device.parent = &vmbus_device->device;
+	child_device_obj->device.parent = &hv_pci_dev->dev;
 	child_device_obj->device.release = vmbus_device_release;
 
 	/*
@@ -875,14 +788,6 @@ static int vmbus_remove(struct device *child_device)
 	int ret;
 	struct hv_driver *drv;
 
-	/* Special case root bus device */
-	if (child_device->parent == NULL) {
-		/*
-		 * No-op since it is statically defined and handle in
-		 * vmbus_bus_exit()
-		 */
-		return 0;
-	}
 
 	if (child_device->driver) {
 		drv = drv_to_hv_drv(child_device->driver);
@@ -911,14 +816,6 @@ static void vmbus_shutdown(struct device *child_device)
 {
 	struct hv_driver *drv;
 
-	/* Special case root bus device */
-	if (child_device->parent == NULL) {
-		/*
-		 * No-op since it is statically defined and handle in
-		 * vmbus_bus_exit()
-		 */
-		return;
-	}
 
 	/* The device may not be attached yet */
 	if (!child_device->driver)
@@ -933,17 +830,6 @@ static void vmbus_shutdown(struct device *child_device)
 	return;
 }
 
-/*
- * vmbus_bus_release - Final callback release of the vmbus root device
- */
-static void vmbus_bus_release(struct device *device)
-{
-	/* FIXME */
-	/* Empty release functions are a bug, or a major sign
-	 * of a problem design, this MUST BE FIXED! */
-	dev_err(device, "%s needs to be fixed!\n", __func__);
-	WARN_ON(1);
-}
 
 /*
  * vmbus_device_release - Final callback release of the vmbus child device