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//const char hex_asc[] = "0123456789abcdef";

/**

 * hex_to_bin - convert a hex digit to its real value

 * @ch: ascii character represents hex digit

 *

 * hex_to_bin() converts one hex digit to its actual value or -1 in case of bad

 * input.

 */

int hex_to_bin(char ch)

{

    if ((ch >= '0') && (ch <= '9'))

        return ch - '0';

    ch = tolower(ch);

    if ((ch >= 'a') && (ch <= 'f'))

        return ch - 'a' + 10;

    return -1;

}

EXPORT_SYMBOL(hex_to_bin);

/**

 * hex2bin - convert an ascii hexadecimal string to its binary representation

 * @dst: binary result

 * @src: ascii hexadecimal string

 * @count: result length

 *

 * Return 0 on success, -1 in case of bad input.

 */

int hex2bin(u8 *dst, const char *src, size_t count)

{

    while (count--) {

        int hi = hex_to_bin(*src++);

        int lo = hex_to_bin(*src++);

        if ((hi < 0) || (lo < 0))

            return -1;

        *dst++ = (hi << 4) | lo;

    }

    return 0;

}

EXPORT_SYMBOL(hex2bin);

/**

 * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory

 * @buf: data blob to dump

 * @len: number of bytes in the @buf

 * @rowsize: number of bytes to print per line; must be 16 or 32

 * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)

 * @linebuf: where to put the converted data

 * @linebuflen: total size of @linebuf, including space for terminating NUL

 * @ascii: include ASCII after the hex output

 *

 * hex_dump_to_buffer() works on one "line" of output at a time, i.e.,

 * 16 or 32 bytes of input data converted to hex + ASCII output.

 *

 * Given a buffer of u8 data, hex_dump_to_buffer() converts the input data

 * to a hex + ASCII dump at the supplied memory location.

 * The converted output is always NUL-terminated.

 *

 * E.g.:

 *   hex_dump_to_buffer(frame->data, frame->len, 16, 1,

 *          linebuf, sizeof(linebuf), true);

 *

 * example output buffer:

 * 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f  @ABCDEFGHIJKLMNO

 */

int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,

               char *linebuf, size_t linebuflen, bool ascii)

{

    const u8 *ptr = buf;

    int ngroups;

    u8 ch;

    int j, lx = 0;

    int ascii_column;

    int ret;

    if (rowsize != 16 && rowsize != 32)

        rowsize = 16;

    if (len > rowsize)      /* limit to one line at a time */

        len = rowsize;

    if (!is_power_of_2(groupsize) || groupsize > 8)

        groupsize = 1;

    if ((len % groupsize) != 0) /* no mixed size output */

        groupsize = 1;

    ngroups = len / groupsize;

    ascii_column = rowsize * 2 + rowsize / groupsize + 1;

    if (!linebuflen)

        goto overflow1;

    if (!len)

        goto nil;

    if (groupsize == 8) {

        const u64 *ptr8 = buf;

        for (j = 0; j < ngroups; j++) {

            ret = snprintf(linebuf + lx, linebuflen - lx,

                       "%s%16.16llx", j ? " " : "",

                       (unsigned long long)*(ptr8 + j));

            if (ret >= linebuflen - lx)

                goto overflow1;

            lx += ret;

        }

    } else if (groupsize == 4) {

        const u32 *ptr4 = buf;

        for (j = 0; j < ngroups; j++) {

            ret = snprintf(linebuf + lx, linebuflen - lx,

                       "%s%8.8x", j ? " " : "",

                       *(ptr4 + j));

            if (ret >= linebuflen - lx)

                goto overflow1;

            lx += ret;

        }

    } else if (groupsize == 2) {

        const u16 *ptr2 = buf;

        for (j = 0; j < ngroups; j++) {

            ret = snprintf(linebuf + lx, linebuflen - lx,

                       "%s%4.4x", j ? " " : "",

                       *(ptr2 + j));

            if (ret >= linebuflen - lx)

                goto overflow1;

            lx += ret;

        }

    } else {

        for (j = 0; j < len; j++) {

            if (linebuflen < lx + 3)

                goto overflow2;

            ch = ptr[j];

            linebuf[lx++] = hex_asc_hi(ch);

            linebuf[lx++] = hex_asc_lo(ch);

            linebuf[lx++] = ' ';

        }

        if (j)

            lx--;

    }

    if (!ascii)

        goto nil;

    while (lx < ascii_column) {

        if (linebuflen < lx + 2)

            goto overflow2;

        linebuf[lx++] = ' ';

    }

    for (j = 0; j < len; j++) {

        if (linebuflen < lx + 2)

            goto overflow2;

        ch = ptr[j];

        linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.';

    }

nil:

    linebuf[lx] = '\0';

    return lx;

overflow2:

    linebuf[lx++] = '\0';

overflow1:

    return ascii ? ascii_column + len : (groupsize * 2 + 1) * ngroups - 1;

}

/**

 * print_hex_dump - print a text hex dump to syslog for a binary blob of data

 * @level: kernel log level (e.g. KERN_DEBUG)

 * @prefix_str: string to prefix each line with;

 *  caller supplies trailing spaces for alignment if desired

 * @prefix_type: controls whether prefix of an offset, address, or none

 *  is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)

 * @rowsize: number of bytes to print per line; must be 16 or 32

 * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)

 * @buf: data blob to dump

 * @len: number of bytes in the @buf

 * @ascii: include ASCII after the hex output

 *

 * Given a buffer of u8 data, print_hex_dump() prints a hex + ASCII dump

 * to the kernel log at the specified kernel log level, with an optional

 * leading prefix.

 *

 * print_hex_dump() works on one "line" of output at a time, i.e.,

 * 16 or 32 bytes of input data converted to hex + ASCII output.

 * print_hex_dump() iterates over the entire input @buf, breaking it into

 * "line size" chunks to format and print.

 *

 * E.g.:

 *   print_hex_dump(KERN_DEBUG, "raw data: ", DUMP_PREFIX_ADDRESS,

 *          16, 1, frame->data, frame->len, true);

 *

 * Example output using %DUMP_PREFIX_OFFSET and 1-byte mode:

 * 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f  @ABCDEFGHIJKLMNO

 * Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode:

 * ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c  pqrstuvwxyz{|}~.

 */

void print_hex_dump(const char *level, const char *prefix_str, int prefix_type,

            int rowsize, int groupsize,

            const void *buf, size_t len, bool ascii)

{

    const u8 *ptr = buf;

    int i, linelen, remaining = len;

    unsigned char linebuf[32 * 3 + 2 + 32 + 1];

    if (rowsize != 16 && rowsize != 32)

        rowsize = 16;

    for (i = 0; i < len; i += rowsize) {

        linelen = min(remaining, rowsize);

        remaining -= rowsize;

        hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,

                   linebuf, sizeof(linebuf), ascii);

        switch (prefix_type) {

        case DUMP_PREFIX_ADDRESS:

            printk("%s%s%p: %s\n",

                   level, prefix_str, ptr + i, linebuf);

            break;

        case DUMP_PREFIX_OFFSET:

            printk("%s%s%.8x: %s\n", level, prefix_str, i, linebuf);

            break;

        default:

            printk("%s%s%s\n", level, prefix_str, linebuf);

            break;

        }

    }

}

void print_hex_dump_bytes(const char *prefix_str, int prefix_type,

                          const void *buf, size_t len)

{

    print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, 16, 1,

                       buf, len, true);

signed long

fence_wait_timeout(struct fence *fence, bool intr, signed long timeout)

{

        signed long ret;

        if (WARN_ON(timeout < 0))

                return -EINVAL;

//        trace_fence_wait_start(fence);

        ret = fence->ops->wait(fence, intr, timeout);

//        trace_fence_wait_end(fence);

        return ret;

}

void fence_release(struct kref *kref)

{

        struct fence *fence =

                        container_of(kref, struct fence, refcount);

//        trace_fence_destroy(fence);

        BUG_ON(!list_empty(&fence->cb_list));

        if (fence->ops->release)

                fence->ops->release(fence);

        else

                fence_free(fence);

}

void fence_free(struct fence *fence)

{

        kfree_rcu(fence, rcu);

}

EXPORT_SYMBOL(fence_free);