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authorPiotr Maziarz <piotrx.maziarz@linux.intel.com>2019-11-07 13:45:37 +0100
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-11-14 13:15:12 -0500
commit353cade3149c27b53260932ee3ff1ebde405976d (patch)
treedc109cd70ca402efe1e42b6c4fe5b814b39ecf71
parentc7411a1a126f649be71526a36d4afac9e5aefa13 (diff)
seq_buf: Add printing formatted hex dumps
Provided function is an analogue of print_hex_dump(). Implementing this function in seq_buf allows using for multiple purposes (e.g. for tracing) and therefore prevents from code duplication in every layer that uses seq_buf. print_hex_dump() is an essential part of logging data to dmesg. Adding similar capability for other purposes is beneficial to all users. Example usage: seq_buf_hex_dump(seq, "", DUMP_PREFIX_OFFSET, 16, 4, buf, ARRAY_SIZE(buf), true); Example output: 00000000: 00000000 ffffff10 ffffff32 ffff3210 ........2....2.. 00000010: ffff3210 83d00437 c0700000 00000000 .2..7.....p..... 00000020: 02010004 0000000f 0000000f 00004002 .............@.. 00000030: 00000fff 00000000 ........ Link: http://lkml.kernel.org/r/1573130738-29390-1-git-send-email-piotrx.maziarz@linux.intel.com Signed-off-by: Piotr Maziarz <piotrx.maziarz@linux.intel.com> Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
-rw-r--r--include/linux/seq_buf.h3
-rw-r--r--lib/seq_buf.c62
2 files changed, 65 insertions, 0 deletions
diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
index aa5deb041c25..fb0205d87d3c 100644
--- a/include/linux/seq_buf.h
+++ b/include/linux/seq_buf.h
@@ -125,6 +125,9 @@ extern int seq_buf_putmem(struct seq_buf *s, const void *mem, unsigned int len);
extern int seq_buf_putmem_hex(struct seq_buf *s, const void *mem,
unsigned int len);
extern int seq_buf_path(struct seq_buf *s, const struct path *path, const char *esc);
+extern int seq_buf_hex_dump(struct seq_buf *s, const char *prefix_str,
+ int prefix_type, int rowsize, int groupsize,
+ const void *buf, size_t len, bool ascii);
#ifdef CONFIG_BINARY_PRINTF
extern int
diff --git a/lib/seq_buf.c b/lib/seq_buf.c
index bd807f545a9d..4e865d42ab03 100644
--- a/lib/seq_buf.c
+++ b/lib/seq_buf.c
@@ -328,3 +328,65 @@ int seq_buf_to_user(struct seq_buf *s, char __user *ubuf, int cnt)
s->readpos += cnt;
return cnt;
}
+
+/**
+ * seq_buf_hex_dump - print formatted hex dump into the sequence buffer
+ * @s: seq_buf descriptor
+ * @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
+ *
+ * Function is an analogue of print_hex_dump() and thus has similar interface.
+ *
+ * linebuf size is maximal length for one line.
+ * 32 * 3 - maximum bytes per line, each printed into 2 chars + 1 for
+ * separating space
+ * 2 - spaces separating hex dump and ascii representation
+ * 32 - ascii representation
+ * 1 - terminating '\0'
+ *
+ * Returns zero on success, -1 on overflow
+ */
+int seq_buf_hex_dump(struct seq_buf *s, 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];
+ int ret;
+
+ 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:
+ ret = seq_buf_printf(s, "%s%p: %s\n",
+ prefix_str, ptr + i, linebuf);
+ break;
+ case DUMP_PREFIX_OFFSET:
+ ret = seq_buf_printf(s, "%s%.8x: %s\n",
+ prefix_str, i, linebuf);
+ break;
+ default:
+ ret = seq_buf_printf(s, "%s%s\n", prefix_str, linebuf);
+ break;
+ }
+ if (ret)
+ return ret;
+ }
+ return 0;
+}