/*
 * This file is part of the Chelsio T3 Ethernet driver for Linux.
 *
 * Copyright (C) 2003-2009 Chelsio Communications.  All rights reserved.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the LICENSE file included in this
 * release for licensing terms and conditions.
 */

/*
 *      Definitions and inline functions for the T3 trace buffers.
 *
 *      Authors:
 *              Felix Marti <felix@chelsio.com>
 */

#ifndef __T3_TRACE_H__
#define __T3_TRACE_H__

#if defined(T3_TRACE) || defined(T3_TRACE_TOM)

#include <linux/time.h>
#include <linux/timex.h>

#define T3_TRACE_NUM_PARAM 6

typedef unsigned long tracearg_t;

#define T3_TRACE0(b, s) \
        if ((b) != NULL) \
                (void) t3_trace((b), (s));
#define	T3_TRACE1(b, s, p0) \
        if ((b) != NULL) { \
                tracearg_t *_p = t3_trace((b), (s)); \
                _p[0] = (tracearg_t) (p0); \
        }
#define T3_TRACE2(b, s, p0, p1) \
        if ((b) != NULL) { \
                tracearg_t *_p = t3_trace((b), (s)); \
                _p[0] = (tracearg_t) (p0); \
                _p[1] = (tracearg_t) (p1); \
        }
#define T3_TRACE3(b, s, p0, p1, p2) \
        if ((b) != NULL) { \
                tracearg_t *_p = t3_trace((b), (s)); \
                _p[0] = (tracearg_t) (p0); \
                _p[1] = (tracearg_t) (p1); \
                _p[2] = (tracearg_t) (p2); \
        }
#define T3_TRACE4(b, s, p0, p1, p2, p3) \
        if ((b) != NULL) { \
                tracearg_t *_p = t3_trace((b), (s)); \
                _p[0] = (tracearg_t) (p0); \
                _p[1] = (tracearg_t) (p1); \
                _p[2] = (tracearg_t) (p2); \
                _p[3] = (tracearg_t) (p3); \
        }
#define T3_TRACE5(b, s, p0, p1, p2, p3, p4) \
        if ((b) != NULL) { \
                tracearg_t *_p = t3_trace((b), (s)); \
                _p[0] = (tracearg_t) (p0); \
                _p[1] = (tracearg_t) (p1); \
                _p[2] = (tracearg_t) (p2); \
                _p[3] = (tracearg_t) (p3); \
                _p[4] = (tracearg_t) (p4); \
        }
#define T3_TRACE6(b, s, p0, p1, p2, p3, p4, p5) \
        if ((b) != NULL) { \
                tracearg_t *_p = t3_trace((b), (s)); \
                _p[0] = (tracearg_t) (p0); \
                _p[1] = (tracearg_t) (p1); \
                _p[2] = (tracearg_t) (p2); \
                _p[3] = (tracearg_t) (p3); \
                _p[4] = (tracearg_t) (p4); \
                _p[5] = (tracearg_t) (p5); \
        }

struct trace_entry {
        cycles_t   tsc;
        char      *fmt;
        tracearg_t param[T3_TRACE_NUM_PARAM];
};

struct dentry;

struct trace_buf {
	unsigned int capacity;          /* size of ring buffer */
	unsigned int idx;               /* index of next entry to write */
	struct dentry *debugfs_dentry;
	struct trace_entry ep[0];       /* the ring buffer */
};

static inline unsigned long *t3_trace(struct trace_buf *tb, char *fmt)
{
        struct trace_entry *ep = &tb->ep[tb->idx++ & (tb->capacity - 1)];

        ep->fmt = fmt;
        ep->tsc = get_cycles();

        return (unsigned long *) &ep->param[0];
}

struct trace_buf *t3_trace_alloc(struct dentry *root, const char *name,
			      unsigned int capacity);
void t3_trace_free(struct trace_buf *tb);

#else
#define T3_TRACE0(b, s)
#define T3_TRACE1(b, s, p0)
#define T3_TRACE2(b, s, p0, p1)
#define T3_TRACE3(b, s, p0, p1, p2)
#define T3_TRACE4(b, s, p0, p1, p2, p3)
#define T3_TRACE5(b, s, p0, p1, p2, p3, p4)
#define T3_TRACE6(b, s, p0, p1, p2, p3, p4, p5)

#define t3_trace_alloc(root, name, capacity) NULL
#define t3_trace_free(tb)
#endif

#endif /* __T3_TRACE_H__ */