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ad0992e97c
Implement a mechanism in the pvrusb2 driver for gathering statistics on the stream buffering, including bytes transferred, buffers handled, buffers in flight, etc. This is useful for debugging certain classes of streaming issues and for determining if the buffer pool size is generally correct for the driver. Signed-off-by: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/*
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*
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* $Id$
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*
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* Copyright (C) 2005 Mike Isely <isely@pobox.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef __PVRUSB2_IO_H
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#define __PVRUSB2_IO_H
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#include <linux/usb.h>
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#include <linux/list.h>
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typedef void (*pvr2_stream_callback)(void *);
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enum pvr2_buffer_state {
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pvr2_buffer_state_none = 0, // Not on any list
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pvr2_buffer_state_idle = 1, // Buffer is ready to be used again
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pvr2_buffer_state_queued = 2, // Buffer has been queued for filling
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pvr2_buffer_state_ready = 3, // Buffer has data available
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};
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struct pvr2_stream;
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struct pvr2_buffer;
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struct pvr2_stream_stats {
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unsigned int buffers_in_queue;
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unsigned int buffers_in_idle;
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unsigned int buffers_in_ready;
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unsigned int buffers_processed;
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unsigned int buffers_failed;
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unsigned int bytes_processed;
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};
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/* Initialize / tear down stream structure */
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struct pvr2_stream *pvr2_stream_create(void);
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void pvr2_stream_destroy(struct pvr2_stream *);
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void pvr2_stream_setup(struct pvr2_stream *,
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struct usb_device *dev,int endpoint,
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unsigned int tolerance);
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void pvr2_stream_set_callback(struct pvr2_stream *,
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pvr2_stream_callback func,
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void *data);
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void pvr2_stream_get_stats(struct pvr2_stream *,
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struct pvr2_stream_stats *,
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int zero_counts);
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/* Query / set the nominal buffer count */
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int pvr2_stream_get_buffer_count(struct pvr2_stream *);
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int pvr2_stream_set_buffer_count(struct pvr2_stream *,unsigned int);
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/* Get a pointer to a buffer that is either idle, ready, or is specified
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named. */
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struct pvr2_buffer *pvr2_stream_get_idle_buffer(struct pvr2_stream *);
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struct pvr2_buffer *pvr2_stream_get_ready_buffer(struct pvr2_stream *);
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struct pvr2_buffer *pvr2_stream_get_buffer(struct pvr2_stream *sp,int id);
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/* Find out how many buffers are idle or ready */
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int pvr2_stream_get_ready_count(struct pvr2_stream *);
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/* Kill all pending buffers and throw away any ready buffers as well */
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void pvr2_stream_kill(struct pvr2_stream *);
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/* Set up the actual storage for a buffer */
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int pvr2_buffer_set_buffer(struct pvr2_buffer *,void *ptr,unsigned int cnt);
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/* Find out size of data in the given ready buffer */
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unsigned int pvr2_buffer_get_count(struct pvr2_buffer *);
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/* Retrieve completion code for given ready buffer */
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int pvr2_buffer_get_status(struct pvr2_buffer *);
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/* Retrieve ID of given buffer */
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int pvr2_buffer_get_id(struct pvr2_buffer *);
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/* Start reading into given buffer (kill it if needed) */
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int pvr2_buffer_queue(struct pvr2_buffer *);
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#endif /* __PVRUSB2_IO_H */
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/*
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Stuff for Emacs to see, in order to encourage consistent editing style:
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*** Local Variables: ***
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*** mode: c ***
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*** fill-column: 75 ***
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*** tab-width: 8 ***
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*** c-basic-offset: 8 ***
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*** End: ***
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*/
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