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

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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: Jake Oshins <jakeo@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jake Oshins 2015-12-14 16:01:40 -08:00 committed by Greg Kroah-Hartman
parent 619848bd07
commit a108393dbf
3 changed files with 12 additions and 11 deletions
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20
drivers/hv/hv.c
View file

@ -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,

2
drivers/hv/hyperv_vmbus.h
View file

@ -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);

1
include/linux/hyperv.h
View file

@ -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