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Commit 4827ee1d authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Greg Kroah-Hartman
Browse files

vmbus: expose debug info for drivers 



Allow driver to get debug information about state of the ring.

Signed-off-by: default avatarStephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2a9d7de2

drivers/hv/hyperv_vmbus.h

+0 −11
Original line number Diff line number Diff line
@@ -248,14 +248,6 @@ struct hv_context { 


extern struct hv_context hv_context;



struct hv_ring_buffer_debug_info {

	u32 current_interrupt_mask;

	u32 current_read_index;

	u32 current_write_index;

	u32 bytes_avail_toread;

	u32 bytes_avail_towrite;

};



/* Hv Interface */



extern int hv_init(void);
@@ -289,9 +281,6 @@ int hv_ringbuffer_read(struct vmbus_channel *channel, 
		       void *buffer, u32 buflen, u32 *buffer_actual_len,

		       u64 *requestid, bool raw);



void hv_ringbuffer_get_debuginfo(const struct hv_ring_buffer_info *ring_info,

				 struct hv_ring_buffer_debug_info *debug_info);



/*

 * Maximum channels is determined by the size of the interrupt page

 * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt

drivers/hv/ring_buffer.c

+1 −0
Original line number Diff line number Diff line
@@ -206,6 +206,7 @@ void hv_ringbuffer_get_debuginfo(const struct hv_ring_buffer_info *ring_info, 
			ring_info->ring_buffer->interrupt_mask;

	}

}

EXPORT_SYMBOL_GPL(hv_ringbuffer_get_debuginfo);



/* Initialize the ring buffer. */

int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,

include/linux/hyperv.h

+17 −0
Original line number Diff line number Diff line
@@ -491,6 +491,12 @@ struct vmbus_channel_rescind_offer { 
	u32 child_relid;

} __packed;



static inline u32

hv_ringbuffer_pending_size(const struct hv_ring_buffer_info *rbi)

{

	return rbi->ring_buffer->pending_send_sz;

}



/*

 * Request Offer -- no parameters, SynIC message contains the partition ID

 * Set Snoop -- no parameters, SynIC message contains the partition ID
@@ -1148,6 +1154,17 @@ static inline void *hv_get_drvdata(struct hv_device *dev) 
	return dev_get_drvdata(&dev->device);

}



struct hv_ring_buffer_debug_info {

	u32 current_interrupt_mask;

	u32 current_read_index;

	u32 current_write_index;

	u32 bytes_avail_toread;

	u32 bytes_avail_towrite;

};



void hv_ringbuffer_get_debuginfo(const struct hv_ring_buffer_info *ring_info,

			    struct hv_ring_buffer_debug_info *debug_info);



/* Vmbus interface */

#define vmbus_driver_register(driver)	\

	__vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)