Commit a108393d authored by Jake Oshins's avatar Jake Oshins Committed by Greg Kroah-Hartman
Browse files

drivers:hv: Export the API to invoke a hypercall on Hyper-V 



This patch exposes the function that hv_vmbus.ko uses to make hypercalls.  This
is necessary for retargeting an interrupt when it is given a new affinity.

Since we are exporting this API, rename the API as it will be visible outside
the hv.c file.

Signed-off-by: default avatarJake Oshins <jakeo@microsoft.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 619848bd

drivers/hv/hv.c

+10 −10
Original line number Diff line number Diff line
@@ -89,9 +89,9 @@ static int query_hypervisor_info(void) 
}



/*

 * do_hypercall- Invoke the specified hypercall

 * hv_do_hypercall- Invoke the specified hypercall

 */

static u64 do_hypercall(u64 control, void *input, void *output)

u64 hv_do_hypercall(u64 control, void *input, void *output)

{

	u64 input_address = (input) ? virt_to_phys(input) : 0;

	u64 output_address = (output) ? virt_to_phys(output) : 0;
@@ -132,6 +132,7 @@ static u64 do_hypercall(u64 control, void *input, void *output) 
	return hv_status_lo | ((u64)hv_status_hi << 32);

#endif /* !x86_64 */

}

EXPORT_SYMBOL_GPL(hv_do_hypercall);



#ifdef CONFIG_X86_64

static cycle_t read_hv_clock_tsc(struct clocksource *arg)
@@ -316,7 +317,7 @@ int hv_post_message(union hv_connection_id connection_id, 
{



	struct hv_input_post_message *aligned_msg;

	u16 status;

	u64 status;



	if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)

		return -EMSGSIZE;
@@ -330,11 +331,10 @@ int hv_post_message(union hv_connection_id connection_id, 
	aligned_msg->payload_size = payload_size;

	memcpy((void *)aligned_msg->payload, payload, payload_size);



	status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)

		& 0xFFFF;

	status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);



	put_cpu();

	return status;

	return status & 0xFFFF;

}
@@ -344,13 +344,13 @@ int hv_post_message(union hv_connection_id connection_id, 
 *

 * This involves a hypercall.

 */

u16 hv_signal_event(void *con_id)

int hv_signal_event(void *con_id)

{

	u16 status;

	u64 status;



	status = (do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL) & 0xFFFF);

	status = hv_do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL);



	return status;

	return status & 0xFFFF;

}



static int hv_ce_set_next_event(unsigned long delta,

drivers/hv/hyperv_vmbus.h

+1 −1
Original line number Diff line number Diff line
@@ -587,7 +587,7 @@ extern int hv_post_message(union hv_connection_id connection_id, 
			 enum hv_message_type message_type,

			 void *payload, size_t payload_size);



extern u16 hv_signal_event(void *con_id);

extern int hv_signal_event(void *con_id);



extern int hv_synic_alloc(void);

include/linux/hyperv.h

+1 −0
Original line number Diff line number Diff line
@@ -984,6 +984,7 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, 
			bool fb_overlap_ok);



int vmbus_cpu_number_to_vp_number(int cpu_number);

u64 hv_do_hypercall(u64 control, void *input, void *output);



/**

 * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device

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