linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Memory mapped I/O tracing

 *

 * Copyright (C) 2008 Pekka Paalanen <pq@iki.fi>

 */

​

#define DEBUG 1

​

#include <linux/kernel.h>

#include <linux/mmiotrace.h>

#include <linux/pci.h>

#include <linux/slab.h>

#include <linux/time.h>

​

#include <linux/atomic.h>

​

#include "trace.h"

#include "trace_output.h"

​

struct header_iter {

    struct pci_dev *dev;

};

​

static struct trace_array *mmio_trace_array;

static bool overrun_detected;

static unsigned long prev_overruns;

static atomic_t dropped_count;

​

static void mmio_reset_data(struct trace_array *tr)

{

    overrun_detected = false;

    prev_overruns = 0;

​

    tracing_reset_online_cpus(&tr->trace_buffer);

}

​

static int mmio_trace_init(struct trace_array *tr)

{

    pr_debug("in %s\n", __func__);

    mmio_trace_array = tr;

​

    mmio_reset_data(tr);

    enable_mmiotrace();

    return 0;

}

​

static void mmio_trace_reset(struct trace_array *tr)

{

    pr_debug("in %s\n", __func__);

​

    disable_mmiotrace();

    mmio_reset_data(tr);

    mmio_trace_array = NULL;

}

​

static void mmio_trace_start(struct trace_array *tr)

{

    pr_debug("in %s\n", __func__);

    mmio_reset_data(tr);

}

​

static void mmio_print_pcidev(struct trace_seq *s, const struct pci_dev *dev)