Commit 18a34bb5 authored by Roman Kisel's avatar Roman Kisel Committed by Wei Liu
Browse files

Drivers: hv: vmbus: Introduce hv_get_vmbus_root_device() 



The ARM64 PCI code for hyperv needs to know the VMBus root
device, and it is private.

Provide a function that returns it. Rename it from "hv_dev"
as "hv_dev" as a symbol is very overloaded. No functional
changes.

Signed-off-by: default avatarRoman Kisel <romank@linux.microsoft.com>
Reviewed-by: default avatarMichael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/20250428210742.435282-10-romank@linux.microsoft.com


Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
Message-ID: <20250428210742.435282-10-romank@linux.microsoft.com>
parent 1dc5df13

drivers/hv/vmbus_drv.c

+15 −8
Original line number Diff line number Diff line
@@ -45,7 +45,8 @@ struct vmbus_dynid { 
	struct hv_vmbus_device_id id;

};



static struct device  *hv_dev;

/* VMBus Root Device */

static struct device  *vmbus_root_device;



static int hyperv_cpuhp_online;
@@ -80,9 +81,15 @@ static struct resource *fb_mmio; 
static struct resource *hyperv_mmio;

static DEFINE_MUTEX(hyperv_mmio_lock);



struct device *hv_get_vmbus_root_device(void)

{

	return vmbus_root_device;

}

EXPORT_SYMBOL_GPL(hv_get_vmbus_root_device);



static int vmbus_exists(void)

{

	if (hv_dev == NULL)

	if (vmbus_root_device == NULL)

		return -ENODEV;



	return 0;
@@ -861,7 +868,7 @@ static int vmbus_dma_configure(struct device *child_device) 
	 * On x86/x64 coherence is assumed and these calls have no effect.

	 */

	hv_setup_dma_ops(child_device,

		device_get_dma_attr(hv_dev) == DEV_DMA_COHERENT);

		device_get_dma_attr(vmbus_root_device) == DEV_DMA_COHERENT);

	return 0;

}
@@ -2037,7 +2044,7 @@ int vmbus_device_register(struct hv_device *child_device_obj) 
		     &child_device_obj->channel->offermsg.offer.if_instance);



	child_device_obj->device.bus = &hv_bus;

	child_device_obj->device.parent = hv_dev;

	child_device_obj->device.parent = vmbus_root_device;

	child_device_obj->device.release = vmbus_device_release;



	child_device_obj->device.dma_parms = &child_device_obj->dma_parms;
@@ -2412,7 +2419,7 @@ static int vmbus_acpi_add(struct platform_device *pdev) 
	struct acpi_device *ancestor;

	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);



	hv_dev = &device->dev;

	vmbus_root_device = &device->dev;



	/*

	 * Older versions of Hyper-V for ARM64 fail to include the _CCA
@@ -2498,7 +2505,7 @@ static int vmbus_device_add(struct platform_device *pdev) 
	struct device_node *np = pdev->dev.of_node;

	int ret;



	hv_dev = &pdev->dev;

	vmbus_root_device = &pdev->dev;



	ret = of_range_parser_init(&parser, np);

	if (ret)
@@ -2816,7 +2823,7 @@ static int __init hv_acpi_init(void) 
	if (ret)

		return ret;



	if (!hv_dev) {

	if (!vmbus_root_device) {

		ret = -ENODEV;

		goto cleanup;

	}
@@ -2847,7 +2854,7 @@ static int __init hv_acpi_init(void) 


cleanup:

	platform_driver_unregister(&vmbus_platform_driver);

	hv_dev = NULL;

	vmbus_root_device = NULL;

	return ret;

}

include/linux/hyperv.h

+2 −0
Original line number Diff line number Diff line
@@ -1283,6 +1283,8 @@ static inline void *hv_get_drvdata(struct hv_device *dev) 
	return dev_get_drvdata(&dev->device);

}



struct device *hv_get_vmbus_root_device(void);



struct hv_ring_buffer_debug_info {

	u32 current_interrupt_mask;

	u32 current_read_index;