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path: root/cesar/lib/src/trace.c
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/* Cesar project {{{
 *
 * Copyright (C) 2007 Spidcom
 *
 * <<<Licence>>>
 *
 * }}} */
/**
 * \file    lib/src/trace.c
 * \brief   Trace system.
 * \ingroup lib
 */
#include "common/std.h"

#include "lib/trace.h"
#include "hal/arch/arch.h"
#include "hal/arch/io.h"

#include <stdio.h>

#define TRACE_ALIGN (sizeof (u32))
#define TRACE_DEBUG_ARGS 0

/** Trace system context. */
struct trace_t
{
    /** List of buffers. */
    list_t buffers;
};

static trace_t trace_global;

void
trace_init (void)
{
    trace_t * const ctx = &trace_global;
    list_init (&ctx->buffers);
#if CONFIG_TRACE_ON_FATAL
    dbg_assert (!dbg_fatal_cb[0]);
    dbg_fatal_cb[0] = trace_dbg_dump_all;
#endif
}

void
trace_uninit (void)
{
    trace_t * const ctx = &trace_global;
    dbg_assert (list_empty (&ctx->buffers));
}

bool
trace_drop_chunks (uint n)
{
    dbg_assert (n > 0);
    trace_t * const ctx = &trace_global;
    /* Can not help if no trace buffers. */
    if (list_empty (&ctx->buffers))
        return false;
    while (n)
    {
        /* Search the biggest buffer, taking drop level into account. */
        trace_buffer_t *bigest_buf = NULL;
        uint bigest_buf_size = 0, second_buf_size = 0;
        list_node_t *i, *end;
        i = list_begin (&ctx->buffers);
        end = list_end (&ctx->buffers);
        for (; i != end; i = list_next (i))
        {
            trace_buffer_t *buf = PARENT_OF (trace_buffer_t, node, i);
            if (!buf->locked)
            {
                uint buf_size_shifted = buf->chunks_nb > buf->preload
                    ? (buf->chunks_nb - buf->preload) << buf->drop_level
                    : 0;
                if (buf_size_shifted > bigest_buf_size)
                {
                    second_buf_size = bigest_buf_size;
                    bigest_buf_size = buf_size_shifted;
                    bigest_buf = buf;
                }
            }
        }
        /* Drop as many block as possible to satisfy drop request. */
        if (bigest_buf_size == 0)
            return false;
        uint i_can_drop = MIN (n, ((bigest_buf_size - second_buf_size +
                                    (1 << bigest_buf->drop_level) - 1)
                                   >> bigest_buf->drop_level));
        trace_chunk_t *hdrop, *tdrop;
        hdrop = bigest_buf->head;
        tdrop = hdrop;
        n -= i_can_drop;
        arch_atomic_add ((int *) &bigest_buf->chunks_nb, -i_can_drop);
        while (--i_can_drop)
            tdrop = tdrop->next;
        bigest_buf->head = tdrop->next;
        blk_release_desc_range ((blk_t *) hdrop, (blk_t *) tdrop);
    }
    return true;
}

static int
trace_format_bool (char *text, uint text_size, int data)
{
    const char *t;
    uint ts;
    if (!data)
    {
        t = "false"; ts = 5;
    }
    else
    {
        t = "true"; ts = 4;
    }
    if (ts > text_size)
        return -1;
    else
    {
        memcpy (text, t, ts);
        return ts;
    }
}

static int
trace_format_decimal (char *text, uint text_size, int data)
{
    int ret = snprintf (text, text_size, "%d", data);
    return ret < (int) text_size ? ret : -1;
}

static int
trace_format_unsigned (char *text, uint text_size, int data)
{
    int ret = snprintf (text, text_size, "%u", data);
    return ret < (int) text_size ? ret : -1;
}

static int
trace_format_hexa (char *text, uint text_size, int data)
{
    int ret = snprintf (text, text_size, "0x%08x", data);
    return ret < (int) text_size ? ret : -1;
}

static const char trace_format_hexdigits[] = "0123456789abcdef";

static int
trace_format_mac (char *text, uint text_size, u64 data)
{
    const uint size = 3 * 6 - 1;
    if (text_size < size)
        return -1;
    else
    {
        uint i;
        u64 v;
        v = data;
        for (i = 5; i; i--)
        {
            *text++ = trace_format_hexdigits[(v >> 1*4) & 0xf];
            *text++ = trace_format_hexdigits[(v >> 0*4) & 0xf];
            *text++ = ':';
            v >>= 8;
        }
        *text++ = trace_format_hexdigits[(v >> 1*4) & 0xf];
        *text++ = trace_format_hexdigits[(v >> 0*4) & 0xf];
        return size;
    }
}

void
trace_namespace_init (trace_namespace_t *ns,
                      const trace_event_id_t *event_ids, uint event_ids_nb)
{
    uint i;
    dbg_assert (ns);
    for (i = 0; i < event_ids_nb; i++)
        dbg_assert (event_ids[i].format_string);
    /* Initialise fields. */
    ns->event_ids = event_ids;
    ns->event_ids_nb = event_ids_nb;
    for (i = 0; i < COUNT (ns->formats); i++)
        ns->formats[i].size = 0;
    /* Provide default useful formats. */
    trace_namespace_register_format (ns, 'b', trace_format_bool);
    trace_namespace_register_format (ns, 'd', trace_format_decimal);
    trace_namespace_register_format (ns, 'u', trace_format_unsigned);
    trace_namespace_register_format (ns, 'x', trace_format_hexa);
    trace_namespace_register_format_u64 (ns, 'm', trace_format_mac);
}

void
trace_namespace_register_format (trace_namespace_t *ns, char code,
                                 trace_format_u32_t callback)
{
    dbg_assert (ns);
    dbg_assert ((code >= 'A' && code <= 'Z') || (code >= 'a' && code <= 'z'));
    dbg_assert (callback);
    ns->formats[code - 'A'].callback.format_u32 = callback;
    ns->formats[code - 'A'].size = 1;
}

void
trace_namespace_register_format_u64 (trace_namespace_t *ns, char code,
                                     trace_format_u64_t callback)
{
    dbg_assert (ns);
    dbg_assert ((code >= 'A' && code <= 'Z') || (code >= 'a' && code <= 'z'));
    dbg_assert (callback);
    ns->formats[code - 'A'].callback.format_u64 = callback;
    ns->formats[code - 'A'].size = 2;
}

void
trace_buffer_add (trace_buffer_t *buf, const char *name, uint drop_level,
                  uint preload, bool locked, trace_namespace_t *namespace)
{
    dbg_assert (buf);
    dbg_assert (name);
    dbg_assert (preload > 0);
    trace_t * const ctx = &trace_global;
    /* Initialise trace buffer. */
    list_init_node (&buf->node);
    buf->chunks_nb = preload;
    buf->drop_level = drop_level;
    buf->preload = preload;
    buf->locked = locked && !CONFIG_TRACE_ALL_SLOW;
    buf->name = name;
    buf->namespace = namespace;
    /* Allocate chunks. */
    blk_t *tail;
    buf->head = (trace_chunk_t *) blk_alloc_desc_range (preload, &tail);
    buf->tail = (trace_chunk_t *) tail;
    /* Initialise chunks. */
    trace_chunk_t *i = buf->head;
    do
    {
        i->data_end = i->data;
        i->chunk_end = i->data + BLK_SIZE / TRACE_ALIGN;
        if (i == buf->tail)
            break;
        i = i->next;
    } while (1);
    /* Add it to context. */
    list_push (&ctx->buffers, &buf->node);
}

void
trace_buffer_remove (trace_buffer_t *buf)
{
    dbg_assert (buf);
    trace_t * const ctx = &trace_global;
    /* Remove from context. */
    list_remove (&ctx->buffers, &buf->node);
    /* Release chunks. */
    blk_release_desc_range ((blk_t *) buf->head, (blk_t *) buf->tail);
}

trace_buffer_t *
trace_buffer_get (const char *name)
{
    dbg_assert (name);
    trace_t * const ctx = &trace_global;
    /* Search in list. */
    list_node_t *i, *end;
    i = list_begin (&ctx->buffers);
    end = list_end (&ctx->buffers);
    for (; i != end; i = list_next (i))
    {
        trace_buffer_t *buf = PARENT_OF (trace_buffer_t, node, i);
        if (strcmp (buf->name, name) == 0)
            return buf;
    }
    return NULL;
}

static int
trace_buffer_dump_event (char *text, char *text_end,
                         trace_namespace_t *namespace,
                         uint **data, uint *data_end)
{
    dbg_assert (text && text_end && text < text_end);
    dbg_assert (namespace);
    dbg_assert (data && *data && data_end && *data < data_end);
    /* Read event ID. */
    uint id = **data;
    uint args = id & 0xff;
    id >>= 8;
    uint oargs = args;
    int *parg = (int *) *data + 1;
    dbg_assert (parg + args <= (int *) data_end);
    dbg_assert (id < namespace->event_ids_nb);
    const trace_event_id_t *ei = &namespace->event_ids[id];
    dbg_assert (ei->format_string);
    char *p = text;
    /* Print time stamp. */
    if (ei->timestamp)
    {
        dbg_assert (args);
        args--;
        int ret = snprintf (p, text_end - p, "[0x%08x] ", *parg++);
        if (ret >= text_end - p)
            return -1;
        p += ret;
    }
    else
    {
        int ret = snprintf (p, text_end - p, "[.] ");
        if (ret >= text_end - p)
            return -1;
        p += ret;
    }
    /* Decode format string. */
    const char *fp;
    for (fp = ei->format_string; *fp; fp++)
    {
        if (*fp == '%' && *++fp != '%')
        {
            dbg_assert (((*fp >= 'A' && *fp <= 'Z')
                         || (*fp >= 'a' && *fp <= 'z'))
                        && namespace->formats[*fp - 'A'].size);
            int ret;
            if (namespace->formats[*fp - 'A'].size == 1)
            {
                if (TRACE_DEBUG_ARGS && !args)
                {
                    if (p == text_end)
                        return -1;
                    *p++ = '?';
                    ret = 1;
                }
                else
                {
                    dbg_assert (args);
                    args--;
                    ret = namespace->formats[*fp - 'A'].callback.format_u32 (
                        p, text_end - p, *parg++);
                }
            }
            else
            {
                if (TRACE_DEBUG_ARGS && args < 2)
                {
                    if (p == text_end)
                        return -1;
                    *p++ = '?';
                    ret = 1;
                }
                else
                {
                    dbg_assert (args >= 2);
                    args -= 2;
                    u64 arg = (u64) parg[1] << 32 | parg[0];
                    ret = namespace->formats[*fp - 'A'].callback.format_u64 (
                        p, text_end - p, arg);
                    parg += 2;
                }
            }
            if (ret == -1)
                return -1;
            p += ret;
        }
        else
        {
            /* No room left, cancel the dump of this event. */
            if (p == text_end)
                return -1;
            *p++ = *fp;
        }
    }
    dbg_assert (args == 0);
    /* No room left for the trailing new line, cancel the dump of this
     * event. */
    if (p == text_end)
        return -1;
    *p++ = '\n';
    *data += 1 + oargs;
    return p - text;
}

int
trace_buffer_dump (trace_buffer_t *buf, trace_dump_callback_t cb, void *user)
{
#define DUMP_TEXT_SLACK 20
    char text[2000];
    int text_size = 0;
    trace_chunk_t *head, *tail;
    u32 *data, *data_end;
    int sum = 0;
    dbg_assert (buf);
    dbg_assert (buf->head);
    dbg_assert (buf->tail);
    dbg_assert (buf->name);
    dbg_assert (cb);
    /* Dump buffer name. */
    static const char trace_start_before[] = "---trace-begin[";
    static const char trace_start_after[] = "]---\n";
    static const char trace_stop[] = "---trace-end---\n";
    uint name_len = strlen (buf->name);
    memcpy (text + text_size, trace_start_before,
            sizeof (trace_start_before) - 1);
    text_size += sizeof (trace_start_before) - 1;
    memcpy (text + text_size, buf->name, name_len);
    text_size += name_len;
    memcpy (text + text_size, trace_start_after,
            sizeof (trace_start_after) - 1);
    text_size += sizeof (trace_start_after) - 1;
    dbg_assert ((uint) text_size < sizeof (text) - DUMP_TEXT_SLACK);
    /* TODO: acquire lock, increment reference counter. */
    tail = buf->tail;
    head = buf->head;
    /* Loop for each chunks. */
    do
    {
        data = head->data;
        data_end = head->data_end;
        /* Loop on this chunk. */
        while (data < data_end)
        {
            int ret = trace_buffer_dump_event (
                text + text_size, text + COUNT (text),
                buf->namespace, &data, data_end);
            if (ret != -1)
                text_size += ret;
            if (ret == -1
                || text_size + DUMP_TEXT_SLACK >= (int) COUNT (text))
            {
                dbg_assert (text_size != 0);
                if (cb (user, text, text_size) != text_size)
                {
                    /* Get out. */
                    sum = -1;
                    break;
                }
                sum += text_size;
                text_size = 0;
            }
        }
        if (sum == -1 || head == tail)
            break;
        head = head->next;
    } while (1);
    /* Final text. */
    if (sum != -1)
    {
        dbg_assert (sizeof (trace_stop) - 1 < DUMP_TEXT_SLACK);
        memcpy (text + text_size, trace_stop, sizeof (trace_stop) - 1);
        text_size += sizeof (trace_stop) - 1;
        if (cb (user, text, text_size) != text_size)
            sum = -1;
        else
            sum += text_size;
    }
    return sum;
}

int
trace_bundle_start (const char *name, trace_dump_callback_t cb, void *user)
{
    int name_len = 0;
    dbg_assert (cb);
    static const char bundle_start_before[] = "---trace-bundle-begin[";
    static const char bundle_start_after[] = "]---\n";
    if (cb (user, bundle_start_before, sizeof (bundle_start_before) - 1)
        != sizeof (bundle_start_before) - 1)
        return -1;
    if (name)
    {
        name_len = strlen (name);
        if (cb (user, name, name_len) != name_len)
            return -1;
    }
    if (cb (user, bundle_start_after, sizeof (bundle_start_after) - 1)
        != sizeof (bundle_start_after) - 1)
        return -1;
    return sizeof (bundle_start_before) - 1 + sizeof (bundle_start_after) - 1
        + name_len;
}

int
trace_bundle_stop (trace_dump_callback_t cb, void *user)
{
    dbg_assert (cb);
    static const char bundle_stop[] = "---trace-bundle-end---\n";
    if (cb (user, bundle_stop, sizeof (bundle_stop) - 1)
        != sizeof (bundle_stop) - 1)
        return -1;
    return sizeof (bundle_stop) - 1;
}

int
trace_bundle_dump_all (const char *name, trace_dump_callback_t cb, void *user)
{
    trace_t * const ctx = &trace_global;
    int sum = 0, r;
    /* Header. */
    r = trace_bundle_start (name, cb, user);
    if (r == -1) return -1;
    sum += r;
    /* Dump all. */
    list_node_t *i, *end;
    i = list_begin (&ctx->buffers);
    end = list_end (&ctx->buffers);
    for (; i != end; i = list_next (i))
    {
        trace_buffer_t *buf = PARENT_OF (trace_buffer_t, node, i);
        r = trace_buffer_dump (buf, cb, user);
        if (r == -1) return -1;
        sum += r;
    }
    /* Footer. */
    r = trace_bundle_stop (cb, user);
    if (r == -1) return -1;
    sum += r;
    return sum;
}

static int
trace_buffer_dbg_dump_callback (void *user, const char *text, uint text_size)
{
    dbg_assert (text && text_size);
    arch_io_write (text, text_size);
    return text_size;
}

void
trace_buffer_dbg_dump (trace_buffer_t *buf)
{
    trace_buffer_dump (buf, trace_buffer_dbg_dump_callback, NULL);
}

void
trace_dbg_dump_all (void)
{
    trace_bundle_dump_all ("dbg", trace_buffer_dbg_dump_callback, NULL);
}

static void
trace_printn_prepare (trace_buffer_t *buf, uint count)
{
    dbg_assert (buf && buf->tail);
    trace_chunk_t *tail = buf->tail;
    if (DEBUG_MORE)
        dbg_assert (tail->data <= tail->data_end
                    && tail->data_end <= tail->chunk_end);
    if (tail->data_end + count > tail->chunk_end)
    {
        /* No room left, allocate a new chunk. */
        dbg_assert (!buf->locked);
        trace_chunk_t *c = (trace_chunk_t *) blk_alloc_desc ();
        c->data_end = c->data;
        c->chunk_end = c->data + BLK_SIZE / TRACE_ALIGN;
        tail->next = c;
        REORDER_BARRIER ();
        buf->tail = c;
        REORDER_BARRIER ();
        arch_atomic_add ((int *) &buf->chunks_nb, 1);
        REORDER_BARRIER ();
    }
}

void
trace_print0 (trace_buffer_t *buf, uint id)
{
    trace_printn_prepare (buf, 1);
    trace_fast_print0 (buf, id);
}

void
trace_print1 (trace_buffer_t *buf, uint id, int arg0)
{
    trace_printn_prepare (buf, 2);
    trace_fast_print1 (buf, id, arg0);
}

void
trace_print2 (trace_buffer_t *buf, uint id, int arg0, int arg1)
{
    trace_printn_prepare (buf, 3);
    trace_fast_print2 (buf, id, arg0, arg1);
}

void
trace_print3 (trace_buffer_t *buf, uint id, int arg0, int arg1, int arg2)
{
    trace_printn_prepare (buf, 4);
    trace_fast_print3 (buf, id, arg0, arg1, arg2);
}

void
trace_print4 (trace_buffer_t *buf, uint id, int arg0, int arg1, int arg2,
              int arg3)
{
    trace_printn_prepare (buf, 5);
    trace_fast_print4 (buf, id, arg0, arg1, arg2, arg3);
}

void
trace_print5 (trace_buffer_t *buf, uint id, int arg0, int arg1, int arg2,
              int arg3, int arg4)
{
    trace_printn_prepare (buf, 6);
    trace_fast_print5 (buf, id, arg0, arg1, arg2, arg3, arg4);
}

void
trace_print6 (trace_buffer_t *buf, uint id, int arg0, int arg1, int arg2,
              int arg3, int arg4, int arg5)
{
    trace_printn_prepare (buf, 7);
    trace_fast_print6 (buf, id, arg0, arg1, arg2, arg3, arg4, arg5);
}

void
trace_print7 (trace_buffer_t *buf, uint id, int arg0, int arg1, int arg2,
              int arg3, int arg4, int arg5, int arg6)
{
    trace_printn_prepare (buf, 8);
    trace_fast_print7 (buf, id, arg0, arg1, arg2, arg3, arg4, arg5, arg6);
}

void
trace_print8 (trace_buffer_t *buf, uint id, int arg0, int arg1, int arg2,
              int arg3, int arg4, int arg5, int arg6, int arg7)
{
    trace_printn_prepare (buf, 9);
    trace_fast_print8 (buf, id, arg0, arg1, arg2, arg3, arg4, arg5, arg6,
                       arg7);
}

static inline u32 *
trace_fast_printn_prepare (trace_buffer_t *buf, uint count)
{
    /* Fast may become slow on request. */
    if (CONFIG_TRACE_ALL_SLOW)
        trace_printn_prepare (buf, count);
    /* "Fast" means no allocation. */
    if (DEBUG_MORE)
        dbg_assert (buf && buf->tail);
    trace_chunk_t *tail = buf->tail;
    if (DEBUG_MORE)
        dbg_assert (tail->data <= tail->data_end
                    && tail->data_end <= tail->chunk_end);
    u32 *data_end = tail->data_end;
    if (data_end + count > tail->chunk_end)
    {
        /* No room left, use the oldest chunk for the new chunk. */
        if (DEBUG_MORE)
            dbg_assert (buf->head && buf->locked);
        trace_chunk_t *head = buf->head;
        tail->next = head;
        buf->tail = head;
        buf->head = head->next;
        tail = head;
        data_end = tail->data;
        tail->data_end = data_end;
        tail->chunk_end = data_end + BLK_SIZE / TRACE_ALIGN;
    }
    /* Dump to buffer. */
    return data_end;
}

void ARCH_ILRAM
trace_fast_print0 (trace_buffer_t *buf, uint id)
{
    u32 *p = trace_fast_printn_prepare (buf, 1);
    *p++ = id << 8 | 0;
    trace_chunk_t *tail = buf->tail;
    REORDER_BARRIER ();
    tail->data_end = p;
}

void ARCH_ILRAM
trace_fast_print1 (trace_buffer_t *buf, uint id, int arg0)
{
    u32 *p = trace_fast_printn_prepare (buf, 2);
    *p++ = id << 8 | 1;
    *p++ = arg0;
    trace_chunk_t *tail = buf->tail;
    REORDER_BARRIER ();
    tail->data_end = p;
}

void ARCH_ILRAM
trace_fast_print2 (trace_buffer_t *buf, uint id, int arg0, int arg1)
{
    u32 *p = trace_fast_printn_prepare (buf, 3);
    *p++ = id << 8 | 2;
    *p++ = arg0;
    *p++ = arg1;
    trace_chunk_t *tail = buf->tail;
    REORDER_BARRIER ();
    tail->data_end = p;
}

void ARCH_ILRAM
trace_fast_print3 (trace_buffer_t *buf, uint id, int arg0, int arg1, int arg2)
{
    u32 *p = trace_fast_printn_prepare (buf, 4);
    *p++ = id << 8 | 3;
    *p++ = arg0;
    *p++ = arg1;
    *p++ = arg2;
    trace_chunk_t *tail = buf->tail;
    REORDER_BARRIER ();
    tail->data_end = p;
}

void ARCH_ILRAM
trace_fast_print4 (trace_buffer_t *buf, uint id, int arg0, int arg1, int arg2,
                   int arg3)
{
    u32 *p = trace_fast_printn_prepare (buf, 5);
    *p++ = id << 8 | 4;
    *p++ = arg0;
    *p++ = arg1;
    *p++ = arg2;
    *p++ = arg3;
    trace_chunk_t *tail = buf->tail;
    REORDER_BARRIER ();
    tail->data_end = p;
}

void ARCH_ILRAM
trace_fast_print5 (trace_buffer_t *buf, uint id, int arg0, int arg1, int arg2,
                   int arg3, int arg4)
{
    u32 *p = trace_fast_printn_prepare (buf, 6);
    *p++ = id << 8 | 5;
    *p++ = arg0;
    *p++ = arg1;
    *p++ = arg2;
    *p++ = arg3;
    *p++ = arg4;
    trace_chunk_t *tail = buf->tail;
    REORDER_BARRIER ();
    tail->data_end = p;
}

void ARCH_ILRAM
trace_fast_print6 (trace_buffer_t *buf, uint id, int arg0, int arg1, int arg2,
                   int arg3, int arg4, int arg5)
{
    u32 *p = trace_fast_printn_prepare (buf, 7);
    *p++ = id << 8 | 6;
    *p++ = arg0;
    *p++ = arg1;
    *p++ = arg2;
    *p++ = arg3;
    *p++ = arg4;
    *p++ = arg5;
    trace_chunk_t *tail = buf->tail;
    REORDER_BARRIER ();
    tail->data_end = p;
}

void ARCH_ILRAM
trace_fast_print7 (trace_buffer_t *buf, uint id, int arg0, int arg1, int arg2,
                   int arg3, int arg4, int arg5, int arg6)
{
    u32 *p = trace_fast_printn_prepare (buf, 8);
    *p++ = id << 8 | 7;
    *p++ = arg0;
    *p++ = arg1;
    *p++ = arg2;
    *p++ = arg3;
    *p++ = arg4;
    *p++ = arg5;
    *p++ = arg6;
    trace_chunk_t *tail = buf->tail;
    REORDER_BARRIER ();
    tail->data_end = p;
}

void ARCH_ILRAM
trace_fast_print8 (trace_buffer_t *buf, uint id, int arg0, int arg1, int arg2,
                   int arg3, int arg4, int arg5, int arg6, int arg7)
{
    u32 *p = trace_fast_printn_prepare (buf, 9);
    *p++ = id << 8 | 8;
    *p++ = arg0;
    *p++ = arg1;
    *p++ = arg2;
    *p++ = arg3;
    *p++ = arg4;
    *p++ = arg5;
    *p++ = arg6;
    *p++ = arg7;
    trace_chunk_t *tail = buf->tail;
    REORDER_BARRIER ();
    tail->data_end = p;
}