vmbus: use resource for hyperv mmio region

Use a resource for the hyperv mmio region instead of start/size
variables.  Register the region properly so it shows up in
/proc/iomem.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hv/vmbus_drv.c

@@ -43,10 +43,12 @@ static struct acpi_device  *hv_acpi_dev;
 static struct tasklet_struct msg_dpc;
 static struct completion probe_event;
 static int irq;
-u64 hyperv_mmio_start;
-EXPORT_SYMBOL_GPL(hyperv_mmio_start);
-u64 hyperv_mmio_size;
-EXPORT_SYMBOL_GPL(hyperv_mmio_size);
+
+struct resource hyperv_mmio = {
+	.name  = "hyperv mmio",
+	.flags = IORESOURCE_MEM,
+};
+EXPORT_SYMBOL_GPL(hyperv_mmio);
 
 static int vmbus_exists(void)
 {
@@ -902,8 +904,8 @@ static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx)
 		break;
 
 	case ACPI_RESOURCE_TYPE_ADDRESS64:
-		hyperv_mmio_start = res->data.address64.minimum;
-		hyperv_mmio_size = res->data.address64.address_length;
+		hyperv_mmio.start = res->data.address64.minimum;
+		hyperv_mmio.end = res->data.address64.maximum;
 		break;
 	}
 
@@ -933,6 +935,8 @@ static int vmbus_acpi_add(struct acpi_device *device)
 
 		if (ACPI_FAILURE(result))
 			goto acpi_walk_err;
+		if (hyperv_mmio.start && hyperv_mmio.end)
+			request_resource(&iomem_resource, &hyperv_mmio);
 	}
 	ret_val = 0;
 

include/linux/hyperv.h

@@ -1167,8 +1167,7 @@ int hv_vss_init(struct hv_util_service *);
 void hv_vss_deinit(void);
 void hv_vss_onchannelcallback(void *);
 
-extern u64 hyperv_mmio_start;
-extern u64 hyperv_mmio_size;
+extern struct resource hyperv_mmio;
 
 /*
  * Negotiated version with the Host.