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drivers:hv: Export a function that maps Linux CPU num onto Hyper-V proc num 

This patch exposes the mapping between Linux CPU number and Hyper-V virtual
processor number.  This is necessary because the hypervisor needs to know which
virtual processors to target when making a mapping in the Interrupt Redirection
Table in the I/O MMU.

Signed-off-by: Jake Oshins <jakeo@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Jake Oshins 2015-12-14 16:01:39 -08:00 committed by Greg Kroah-Hartman
parent 17efbee8ba
commit 619848bd07
2 changed files with 19 additions and 0 deletions
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17
drivers/hv/vmbus_drv.c
View File

@ -1193,6 +1193,23 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
}
EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
/**
* vmbus_cpu_number_to_vp_number() - Map CPU to VP.
* @cpu_number: CPU number in Linux terms
*
* This function returns the mapping between the Linux processor
* number and the hypervisor's virtual processor number, useful
* in making hypercalls and such that talk about specific
* processors.
*
* Return: Virtual processor number in Hyper-V terms
*/
int vmbus_cpu_number_to_vp_number(int cpu_number)
{
return hv_context.vp_index[cpu_number];
}
EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number);
static int vmbus_acpi_add(struct acpi_device *device)
{
acpi_status result;

2
include/linux/hyperv.h
View File

@ -983,6 +983,8 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
resource_size_t size, resource_size_t align,
bool fb_overlap_ok);
int vmbus_cpu_number_to_vp_number(int cpu_number);
/**
* VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device
*