[PATCH v3 0/7] Hexdump Enhancements

@@ -490,6 +490,7 @@ enum {
 #define HEXDUMP_2_GRP_SPACES		BIT(5)
 #define HEXDUMP_4_GRP_SPACES		BIT(6)
 #define HEXDUMP_8_GRP_SPACES		BIT(7)
+#define HEXDUMP_RETAIN_BYTE_ORDER	BIT(8)
 
 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
 			      int groupsize, char *linebuf, size_t linebuflen,

@@ -127,7 +127,8 @@ static void separator_parameters(u64 flags, int groupsize, int *sep_chars,
  * @buf: data blob to dump
  * @len: number of bytes in the @buf
  * @rowsize: number of bytes to print per line; must be a multiple of groupsize
- * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
+ * @groupsize: number of bytes to convert to a native endian number and print:
+ * 	       1, 2, 4, 8; default = 1
  * @linebuf: where to put the converted data
  * @linebuflen: total size of @linebuf, including space for terminating NUL
  * @flags: A bitwise OR of the following flags:

@@ -138,6 +139,9 @@ static void separator_parameters(u64 flags, int groupsize, int *sep_chars,
  *	HEXDUMP_2_GRP_SPACES:		insert a ' ' after every 2 groups
  *	HEXDUMP_4_GRP_SPACES:		insert a ' ' after every 4 groups
  *	HEXDUMP_8_GRP_SPACES:		insert a ' ' after every 8 groups
+ *	HEXDUMP_RETAIN_BYTE_ORDER:	Retain the byte ordering of groups
+ *					instead of treating each group as a
+ *					native-endian number
  *
  * hex_dump_to_buffer() works on one "line" of output at a time, converting
  * <groupsize> bytes of input to hexadecimal (and optionally printable ASCII)

@@ -171,6 +175,7 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
 	int ret;
 	int sep_chars = 0;
 	char sep = 0;
+	bool big_endian = (flags & HEXDUMP_RETAIN_BYTE_ORDER) ? 1 : 0;
 
 	if (!is_power_of_2(groupsize) || groupsize > 8)
 		groupsize = 1;

@@ -202,10 +207,13 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
 		const u64 *ptr8 = buf;
 
 		for (j = 0; j < ngroups; j++) {
+			u64 val = big_endian ?
+					be64_to_cpu(get_unaligned(ptr8 + j)) :
+					get_unaligned(ptr8 + j);
 			ret = snprintf(linebuf + lx, linebuflen - lx,
 				       "%s%16.16llx",
 				       j ? group_separator(j, flags) : "",
-				       get_unaligned(ptr8 + j));
+				       val);
 			if (ret >= linebuflen - lx)
 				goto overflow1;
 			lx += ret;

@@ -214,10 +222,14 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
 		const u32 *ptr4 = buf;
 
 		for (j = 0; j < ngroups; j++) {
+			u32 val = big_endian ?
+					be32_to_cpu(get_unaligned(ptr4 + j)) :
+					get_unaligned(ptr4 + j);
+
 			ret = snprintf(linebuf + lx, linebuflen - lx,
 				       "%s%8.8x",
 				       j ? group_separator(j, flags) : "",
-				       get_unaligned(ptr4 + j));
+				       val);
 			if (ret >= linebuflen - lx)
 				goto overflow1;
 			lx += ret;

@@ -226,10 +238,14 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
 		const u16 *ptr2 = buf;
 
 		for (j = 0; j < ngroups; j++) {
+			u16 val = big_endian ?
+					be16_to_cpu(get_unaligned(ptr2 + j)) :
+					get_unaligned(ptr2 + j);
+
 			ret = snprintf(linebuf + lx, linebuflen - lx,
 				       "%s%4.4x",
 				       j ? group_separator(j, flags) : "",
-				       get_unaligned(ptr2 + j));
+				       val);
 			if (ret >= linebuflen - lx)
 				goto overflow1;
 			lx += ret;

@@ -331,7 +347,8 @@ static void announce_skipped(const char *level, const char *prefix_str,
  * @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 a multiple of groupsize
- * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
+ * @groupsize: number of bytes to convert to a native endian number and print:
+ * 	       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

@@ -342,6 +359,9 @@ static void announce_skipped(const char *level, const char *prefix_str,
  *	HEXDUMP_2_GRP_LINES:		insert a '|' after every 2 groups
  *	HEXDUMP_4_GRP_LINES:		insert a '|' after every 4 groups
  *	HEXDUMP_8_GRP_LINES:		insert a '|' after every 8 groups
+ *	HEXDUMP_RETAIN_BYTE_ORDER:	Retain the byte ordering of groups
+ *					instead of treating each group as a
+ *					native-endian number
  *
  * 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

@@ -98,14 +98,15 @@ static unsigned failed_tests __initdata;
 
 static void __init test_hexdump_prepare_test(size_t len, int rowsize,
 					     int groupsize, char *test,
-					     size_t testlen, bool ascii)
+					     size_t testlen, u64 flags)
 {
 	char *p;
 	const char * const *result;
 	size_t l = len;
 	int gs = groupsize, rs = rowsize;
 	unsigned int i;
-	const bool is_be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
+	const bool is_be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ||
+			(flags & HEXDUMP_RETAIN_BYTE_ORDER);
 
 	if (l > rs)
 		l = rs;

@@ -142,7 +143,7 @@ static void __init test_hexdump_prepare_test(size_t len, int rowsize,
 		p--;
 
 	/* ASCII part */
-	if (ascii) {
+	if (flags & HEXDUMP_ASCII) {
 		do {
 			*p++ = ' ';
 		} while (p < test + rs * 2 + rs / gs + 1);

@@ -157,7 +158,7 @@ static void __init test_hexdump_prepare_test(size_t len, int rowsize,
 #define TEST_HEXDUMP_BUF_SIZE		(64 * 3 + 2 + 64 + 1)
 
 static void __init test_hexdump(size_t len, int rowsize, int groupsize,
-				bool ascii)
+				u64 flags)
 {
 	char test[TEST_HEXDUMP_BUF_SIZE];
 	char real[TEST_HEXDUMP_BUF_SIZE];

@@ -166,11 +167,11 @@ static void __init test_hexdump(size_t len, int rowsize, int groupsize,
 
 	memset(real, FILL_CHAR, sizeof(real));
 	hex_dump_to_buffer(data_b, len, rowsize, groupsize, real, sizeof(real),
-			   ascii ? HEXDUMP_ASCII : 0);
+			   flags);
 
 	memset(test, FILL_CHAR, sizeof(test));
 	test_hexdump_prepare_test(len, rowsize, groupsize, test, sizeof(test),
-				  ascii);
+				  flags);
 
 	if (memcmp(test, real, TEST_HEXDUMP_BUF_SIZE)) {
 		pr_err("Len: %zu row: %d group: %d\n", len, rowsize, groupsize);

@@ -193,7 +194,7 @@ static void __init test_hexdump_set(int rowsize, bool ascii)
 
 static void __init test_hexdump_overflow(size_t buflen, size_t len,
 					 int rowsize, int groupsize,
-					 bool ascii)
+					 u64 flags)
 {
 	char test[TEST_HEXDUMP_BUF_SIZE];
 	char buf[TEST_HEXDUMP_BUF_SIZE];

@@ -205,7 +206,7 @@ static void __init test_hexdump_overflow(size_t buflen, size_t len,
 	memset(buf, FILL_CHAR, sizeof(buf));
 
 	rc = hex_dump_to_buffer(data_b, len, rowsize, groupsize, buf, buflen,
-				ascii ? HEXDUMP_ASCII : 0);
+				flags);
 
 	/*
 	 * Caller must provide the data length multiple of groupsize. The

@@ -222,12 +223,12 @@ static void __init test_hexdump_overflow(size_t buflen, size_t len,
 		  - 1 /* no trailing space */;
 	}
 
-	expected_len = (ascii) ? ascii_len : hex_len;
+	expected_len = (flags & HEXDUMP_ASCII) ? ascii_len : hex_len;
 
 	fill_point = min_t(int, expected_len + 1, buflen);
 	if (buflen) {
 		test_hexdump_prepare_test(len, rowsize, groupsize, test,
-					  sizeof(test), ascii);
+					  sizeof(test), flags);
 		test[fill_point - 1] = '\0';
 	}
 	memset(test + fill_point, FILL_CHAR, sizeof(test) - fill_point);

@@ -237,8 +238,8 @@ static void __init test_hexdump_overflow(size_t buflen, size_t len,
 	buf[sizeof(buf) - 1] = '\0';
 
 	if (!match) {
-		pr_err("rowsize: %u groupsize: %u ascii: %d Len: %zu buflen: %zu strlen: %zu\n",
-			rowsize, groupsize, ascii, len, buflen,
+		pr_err("rowsize: %u groupsize: %u flags: %llx Len: %zu buflen: %zu strlen: %zu\n",
+			rowsize, groupsize, flags, len, buflen,
 			strnlen(buf, sizeof(buf)));
 		pr_err("Result: %d '%-.*s'\n", rc, (int)buflen, buf);
 		pr_err("Expect: %d '%-.*s'\n", expected_len, (int)buflen, test);

@@ -247,7 +248,7 @@ static void __init test_hexdump_overflow(size_t buflen, size_t len,
 	}
 }
 
-static void __init test_hexdump_overflow_set(size_t buflen, bool ascii)
+static void __init test_hexdump_overflow_set(size_t buflen, u64 flags)
 {
 	unsigned int i = 0;
 	int rs = (get_random_int() % 4 + 1) * 16;

@@ -256,7 +257,7 @@ static void __init test_hexdump_overflow_set(size_t buflen, bool ascii)
 		int gs = 1 << i;
 		size_t len = get_random_int() % rs + gs;
 
-		test_hexdump_overflow(buflen, rounddown(len, gs), rs, gs, ascii);
+		test_hexdump_overflow(buflen, rounddown(len, gs), rs, gs, flags);
 	} while (i++ < 3);
 }
 

@@ -264,20 +265,43 @@ static int __init test_hexdump_init(void)
 {
 	unsigned int i;
 	int rowsize;
+	u64 flags;
 
+	flags = 0;
 	rowsize = (get_random_int() % 4 + 1) * 16;
 	for (i = 0; i < 16; i++)
-		test_hexdump_set(rowsize, false);
+		test_hexdump_set(rowsize, flags);
 
+	flags = HEXDUMP_ASCII;
 	rowsize = (get_random_int() % 4 + 1) * 16;
 	for (i = 0; i < 16; i++)
-		test_hexdump_set(rowsize, true);
+		test_hexdump_set(rowsize, flags);
 
+	flags = HEXDUMP_RETAIN_BYTE_ORDER;
+	rowsize = (get_random_int() % 2 + 1) * 16;
+	for (i = 0; i < 16; i++)
+		test_hexdump_set(rowsize, flags);
+
+	flags = HEXDUMP_ASCII | HEXDUMP_RETAIN_BYTE_ORDER;
+	rowsize = (get_random_int() % 2 + 1) * 16;
+	for (i = 0; i < 16; i++)
+		test_hexdump_set(rowsize, flags);
+
+	flags = 0;
+	for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
+		test_hexdump_overflow_set(i, flags);
+
+	flags = HEXDUMP_ASCII;
+	for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
+		test_hexdump_overflow_set(i, flags);
+
+	flags = HEXDUMP_RETAIN_BYTE_ORDER;
 	for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
-		test_hexdump_overflow_set(i, false);
+		test_hexdump_overflow_set(i, flags);
 
+	flags = HEXDUMP_ASCII | HEXDUMP_RETAIN_BYTE_ORDER;
 	for (i = 0; i <= TEST_HEXDUMP_BUF_SIZE; i++)
-		test_hexdump_overflow_set(i, true);
+		test_hexdump_overflow_set(i, flags);
 
 	if (failed_tests = 0)
 		pr_info("all %u tests passed\n", total_tests);

@@ -1340,7 +1340,7 @@ static void hexdump(struct drm_printer *m, const void *buf, size_t len)
 		WARN_ON_ONCE(hex_dump_to_buffer(buf + pos, len - pos,
 						rowsize, sizeof(u32),
 						line, sizeof(line),
-						false) >= sizeof(line));
+						0) >= sizeof(line));
 		drm_printf(m, "[%04zx] %s\n", pos, line);
 
 		prev = buf + pos;

@@ -71,7 +71,8 @@ send_mbox(struct isar_hw *isar, u8 his, u8 creg, u8 len, u8 *msg)
 
 			while (l < (int)len) {
 				hex_dump_to_buffer(msg + l, len - l, 32, 1,
-						   isar->log, 256, 1);
+						   isar->log, 256,
+						   HEXDUMP_ASCII);
 				pr_debug("%s: %s %02x: %s\n", isar->name,
 					 __func__, l, isar->log);
 				l += 32;

@@ -100,7 +101,8 @@ rcv_mbox(struct isar_hw *isar, u8 *msg)
 
 			while (l < (int)isar->clsb) {
 				hex_dump_to_buffer(msg + l, isar->clsb - l, 32,
-						   1, isar->log, 256, 1);
+						   1, isar->log, 256,
+						   HEXDUMP_ASCII);
 				pr_debug("%s: %s %02x: %s\n", isar->name,
 					 __func__, l, isar->log);
 				l += 32;

@@ -209,7 +209,7 @@ static ssize_t mbox_test_message_read(struct file *filp, char __user *userbuf,
 		hex_dump_to_buffer(ptr,
 				   MBOX_BYTES_PER_LINE,
 				   MBOX_BYTES_PER_LINE, 1, touser + l,
-				   MBOX_HEXDUMP_LINE_LEN, true);
+				   MBOX_HEXDUMP_LINE_LEN, HEXDUMP_ASCII);
 
 		ptr += MBOX_BYTES_PER_LINE;
 		l += MBOX_HEXDUMP_LINE_LEN;

@@ -2992,7 +2992,7 @@ void xgbe_print_pkt(struct net_device *netdev, struct sk_buff *skb, bool tx_rx)
 		unsigned int len = min(skb->len - i, 32U);
 
 		hex_dump_to_buffer(&skb->data[i], len, 32, 1,
-				   buffer, sizeof(buffer), false);
+				   buffer, sizeof(buffer), 0);
 		netdev_dbg(netdev, "  %#06x: %s\n", i, buffer);
 	}
 

@@ -349,7 +349,7 @@ void xlgmac_print_pkt(struct net_device *netdev,
 		unsigned int len = min(skb->len - i, 32U);
 
 		hex_dump_to_buffer(&skb->data[i], len, 32, 1,
-				   buffer, sizeof(buffer), false);
+				   buffer, sizeof(buffer), 0);
 		netdev_dbg(netdev, "  %#06x: %s\n", i, buffer);
 	}
 

@@ -2662,7 +2662,8 @@ void ath10k_dbg_dump(struct ath10k *ar,
 						(unsigned int)(ptr - buf));
 			hex_dump_to_buffer(ptr, len - (ptr - buf), 16, 1,
 					   linebuf + linebuflen,
-					   sizeof(linebuf) - linebuflen, true);
+					   sizeof(linebuf) - linebuflen,
+					   HEXDUMP_ASCII);
 			dev_printk(KERN_DEBUG, ar->dev, "%s\n", linebuf);
 		}
 	}

@@ -3232,7 +3232,7 @@ il3945_show_measurement(struct device *d, struct device_attribute *attr,
 
 	while (size && PAGE_SIZE - len) {
 		hex_dump_to_buffer(data + ofs, size, 16, 1, buf + len,
-				   PAGE_SIZE - len, true);
+				   PAGE_SIZE - len, HEXDUMP_ASCII);
 		len = strlen(buf);
 		if (PAGE_SIZE - len)
 			buf[len++] = '\n';

@@ -148,7 +148,7 @@ static ssize_t raw_read(struct file *file, char __user *user_buf, size_t count,
 					     debug_info->response_size,
 					     16, 1, debug_info->formatted_data,
 					     sizeof(debug_info->formatted_data),
-					     true);
+					     HEXDUMP_ASCII);
 		/* Only return response the first time it is read */
 		debug_info->response_size = 0;
 	}

@@ -262,7 +262,7 @@ void scsi_print_command(struct scsi_cmnd *cmd)
 						 "CDB[%02x]: ", k);
 				hex_dump_to_buffer(&cmd->cmnd[k], linelen,
 						   16, 1, logbuf + off,
-						   logbuf_len - off, false);
+						   logbuf_len - off, 0);
 			}
 			dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s",
 				   logbuf);

@@ -273,8 +273,7 @@ void scsi_print_command(struct scsi_cmnd *cmd)
 	if (!WARN_ON(off > logbuf_len - 49)) {
 		off += scnprintf(logbuf + off, logbuf_len - off, " ");
 		hex_dump_to_buffer(cmd->cmnd, cmd->cmd_len, 16, 1,
-				   logbuf + off, logbuf_len - off,
-				   false);
+				   logbuf + off, logbuf_len - off, 0);
 	}
 out_printk:
 	dev_printk(KERN_INFO, &cmd->device->sdev_gendev, "%s", logbuf);

@@ -353,8 +352,7 @@ scsi_log_dump_sense(const struct scsi_device *sdev, const char *name, int tag,
 		off = sdev_format_header(logbuf, logbuf_len,
 					 name, tag);
 		hex_dump_to_buffer(&sense_buffer[i], len, 16, 1,
-				   logbuf + off, logbuf_len - off,
-				   false);
+				   logbuf + off, logbuf_len - off, 0);
 		dev_printk(KERN_INFO, &sdev->sdev_gendev, "%s", logbuf);
 	}
 	scsi_log_release_buffer(logbuf);

@@ -61,7 +61,7 @@ void fbtft_dbg_hex(const struct device *dev, int groupsize,
 	va_end(args);
 
 	hex_dump_to_buffer(buf, len, 32, groupsize, text + text_len,
-			   512 - text_len, false);
+			   512 - text_len, 0);
 
 	if (len > 32)
 		dev_info(dev, "%s ...\n", text);

@@ -874,7 +874,8 @@ void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
 
 		size = seq_get_buf(m, &buffer);
 		ret = hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
-					 buffer, size, ascii);
+					 buffer, size,
+					 ascii ? HEXDUMP_ASCII : 0);
 		seq_commit(m, ret < size ? ret : -1);
 
 		seq_putc(m, '\n');

@@ -482,13 +482,13 @@ enum {
 	DUMP_PREFIX_OFFSET
 };
 
-extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
-			      int groupsize, char *linebuf, size_t linebuflen,
-			      bool ascii);
-
 #define HEXDUMP_ASCII			BIT(0)
 #define HEXDUMP_SUPPRESS_REPEATED	BIT(1)
 
+extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
+			      int groupsize, char *linebuf, size_t linebuflen,
+			      u32 flags);
+
 #ifdef CONFIG_PRINTK
 extern void print_hex_dump_ext(const char *level, const char *prefix_str,
 			   int prefix_type, int rowsize, int groupsize,

@@ -85,7 +85,8 @@ EXPORT_SYMBOL(bin2hex);
  * @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
+ * @flags: A bitwise OR of the following flags:
+ *	HEXDUMP_ASCII:			include ASCII after the hex output
  *
  * hex_dump_to_buffer() works on one "line" of output at a time, converting
  * <groupsize> bytes of input to hexadecimal (and optionally printable ASCII)

@@ -97,7 +98,7 @@ EXPORT_SYMBOL(bin2hex);
  *
  * E.g.:
  *   hex_dump_to_buffer(frame->data, frame->len, 16, 1,
- *			linebuf, sizeof(linebuf), true);
+ *			linebuf, sizeof(linebuf), HEXDUMP_ASCII);
  *
  * example output buffer:
  * 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f  @ABCDEFGHIJKLMNO

@@ -109,7 +110,7 @@ EXPORT_SYMBOL(bin2hex);
  * string if enough space had been available.
  */
 int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
-		       char *linebuf, size_t linebuflen, bool ascii)
+		       char *linebuf, size_t linebuflen, u32 flags)
 {
 	const u8 *ptr = buf;
 	int ngroups;

@@ -187,7 +188,7 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
 		if (j)
 			lx--;
 	}
-	if (!ascii)
+	if (!(flags & HEXDUMP_ASCII))
 		goto nil;
 
 	while (lx < ascii_column) {

@@ -207,7 +208,8 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
 overflow2:
 	linebuf[lx++] = '\0';
 overflow1:
-	return ascii ? ascii_column + len : (groupsize * 2 + 1) * ngroups - 1;
+	return (flags & HEXDUMP_ASCII) ? ascii_column + len :
+					 (groupsize * 2 + 1) * ngroups - 1;
 }
 EXPORT_SYMBOL(hex_dump_to_buffer);
 

@@ -336,8 +338,7 @@ void print_hex_dump_ext(const char *level, const char *prefix_str,
 		}
 
 		hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
-				   linebuf, linebuf_len,
-				   flags & HEXDUMP_ASCII);
+				   linebuf, linebuf_len, flags);
 
 		switch (prefix_type) {
 		case DUMP_PREFIX_ADDRESS:

@@ -166,7 +166,7 @@ static void __init test_hexdump(size_t len, int rowsize, int groupsize,
 
 	memset(real, FILL_CHAR, sizeof(real));
 	hex_dump_to_buffer(data_b, len, rowsize, groupsize, real, sizeof(real),
-			   ascii);
+			   ascii ? HEXDUMP_ASCII : 0);
 
 	memset(test, FILL_CHAR, sizeof(test));
 	test_hexdump_prepare_test(len, rowsize, groupsize, test, sizeof(test),

@@ -204,7 +204,8 @@ static void __init test_hexdump_overflow(size_t buflen, size_t len,
 
 	memset(buf, FILL_CHAR, sizeof(buf));
 
-	rc = hex_dump_to_buffer(data_b, len, rowsize, groupsize, buf, buflen, ascii);
+	rc = hex_dump_to_buffer(data_b, len, rowsize, groupsize, buf, buflen,
+				ascii ? HEXDUMP_ASCII : 0);
 
 	/*
 	 * Caller must provide the data length multiple of groupsize. The

@@ -487,6 +487,9 @@ enum {
 #define HEXDUMP_2_GRP_LINES		BIT(2)
 #define HEXDUMP_4_GRP_LINES		BIT(3)
 #define HEXDUMP_8_GRP_LINES		BIT(4)
+#define HEXDUMP_2_GRP_SPACES		BIT(5)
+#define HEXDUMP_4_GRP_SPACES		BIT(6)
+#define HEXDUMP_8_GRP_SPACES		BIT(7)
 
 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
 			      int groupsize, char *linebuf, size_t linebuflen,

@@ -91,9 +91,37 @@ static const char *group_separator(int group, u64 flags)
 	if ((flags & HEXDUMP_2_GRP_LINES) && !((group) % 2))
 		return "|";
 
+	if ((flags & HEXDUMP_8_GRP_SPACES) && !((group) % 8))
+		return "  ";
+
+	if ((flags & HEXDUMP_4_GRP_SPACES) && !((group) % 4))
+		return "  ";
+
+	if ((flags & HEXDUMP_2_GRP_SPACES) && !((group) % 2))
+		return "  ";
+
 	return " ";
 }
 
+static void separator_parameters(u64 flags, int groupsize, int *sep_chars,
+				 char *sep)
+{
+	if (flags & (HEXDUMP_2_GRP_LINES | HEXDUMP_2_GRP_SPACES))
+		*sep_chars = groupsize * 2;
+	if (flags & (HEXDUMP_4_GRP_LINES | HEXDUMP_4_GRP_SPACES))
+		*sep_chars = groupsize * 4;
+	if (flags & (HEXDUMP_8_GRP_LINES | HEXDUMP_8_GRP_SPACES))
+		*sep_chars = groupsize * 8;
+
+	if (flags & (HEXDUMP_2_GRP_LINES | HEXDUMP_4_GRP_LINES |
+					   HEXDUMP_8_GRP_LINES))
+		*sep = '|';
+
+	if (flags & (HEXDUMP_2_GRP_SPACES | HEXDUMP_4_GRP_SPACES |
+					   HEXDUMP_8_GRP_SPACES))
+		*sep = ' ';
+}
+
 /**
  * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
  * @buf: data blob to dump

@@ -107,6 +135,9 @@ static const char *group_separator(int group, u64 flags)
  *	HEXDUMP_2_GRP_LINES:		insert a '|' after every 2 groups
  *	HEXDUMP_4_GRP_LINES:		insert a '|' after every 4 groups
  *	HEXDUMP_8_GRP_LINES:		insert a '|' after every 8 groups
+ *	HEXDUMP_2_GRP_SPACES:		insert a ' ' after every 2 groups
+ *	HEXDUMP_4_GRP_SPACES:		insert a ' ' after every 4 groups
+ *	HEXDUMP_8_GRP_SPACES:		insert a ' ' after every 8 groups
  *
  * hex_dump_to_buffer() works on one "line" of output at a time, converting
  * <groupsize> bytes of input to hexadecimal (and optionally printable ASCII)

@@ -138,7 +169,8 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
 	int j, lx = 0;
 	int ascii_column;
 	int ret;
-	int line_chars = 0;
+	int sep_chars = 0;
+	char sep = 0;
 
 	if (!is_power_of_2(groupsize) || groupsize > 8)
 		groupsize = 1;

@@ -152,8 +184,14 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
 		len = rowsize;
 
 	ngroups = len / groupsize;
+
 	ascii_column = rowsize * 2 + rowsize / groupsize + 1;
 
+	// space separators use 2 spaces in the hex output
+	separator_parameters(flags, groupsize, &sep_chars, &sep);
+	if (sep = ' ')
+		ascii_column += rowsize / sep_chars;
+
 	if (!linebuflen)
 		goto overflow1;
 

@@ -221,24 +259,17 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
 		linebuf[lx++] = ' ';
 	}
 
-	if (flags & HEXDUMP_2_GRP_LINES)
-		line_chars = groupsize * 2;
-	if (flags & HEXDUMP_4_GRP_LINES)
-		line_chars = groupsize * 4;
-	if (flags & HEXDUMP_8_GRP_LINES)
-		line_chars = groupsize * 8;
-
 	for (j = 0; j < len; j++) {
 		if (linebuflen < lx + 2)
 			goto overflow2;
 		ch = ptr[j];
 		linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.';
 
-		if (line_chars && ((j + 1) < len) &&
-				((j + 1) % line_chars = 0)) {
+		if (sep_chars && ((j + 1) < len) &&
+				((j + 1) % sep_chars = 0)) {
 			if (linebuflen < lx + 2)
 				goto overflow2;
-			linebuf[lx++] = '|';
+			linebuf[lx++] = sep;
 		}
 	}
 nil:

@@ -247,9 +278,11 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
 overflow2:
 	linebuf[lx++] = '\0';
 overflow1:
-	return (flags & HEXDUMP_ASCII) ? ascii_column + len +
-					(len - 1) / line_chars :
-					 (groupsize * 2 + 1) * ngroups - 1;
+	if (flags & HEXDUMP_ASCII)
+		return ascii_column + len + (len - 1) / sep_chars;
+
+	return groupsize * 2 * ngroups +
+		((sep = ' ') ? 2 : 1) * (ngroups - 1);
 }
 EXPORT_SYMBOL(hex_dump_to_buffer);
 

@@ -343,9 +376,9 @@ void print_hex_dump_ext(const char *level, const char *prefix_str,
 
 	/* Worst case line length:
 	 * 2 hex chars + space per byte in, 2 spaces, 1 char per byte in,
-	 * 1 char per N groups, NULL
+	 * 2 char per N groups, NULL
 	 */
-	linebuf_len = rowsize * 3 + 2 + rowsize + rowsize / groupsize + 1;
+	linebuf_len = rowsize * 3 + 2 + rowsize + 2 * rowsize / groupsize + 1;
 	linebuf = kzalloc(linebuf_len, GFP_KERNEL);
 	if (!linebuf) {
 		printk("%s%shexdump: Could not alloc %u bytes for buffer\n",

@@ -481,13 +481,18 @@ enum {
 	DUMP_PREFIX_ADDRESS,
 	DUMP_PREFIX_OFFSET
 };
+
 extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
 			      int groupsize, char *linebuf, size_t linebuflen,
 			      bool ascii);
+
+#define HEXDUMP_ASCII			BIT(0)
+#define HEXDUMP_SUPPRESS_REPEATED	BIT(1)
+
 #ifdef CONFIG_PRINTK
-extern void print_hex_dump(const char *level, const char *prefix_str,
+extern void print_hex_dump_ext(const char *level, const char *prefix_str,
 			   int prefix_type, int rowsize, int groupsize,
-			   const void *buf, size_t len, bool ascii);
+			   const void *buf, size_t len, u32 flags);
 #if defined(CONFIG_DYNAMIC_DEBUG)
 #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len)	\
 	dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)

@@ -496,18 +501,28 @@ extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 				 const void *buf, size_t len);
 #endif /* defined(CONFIG_DYNAMIC_DEBUG) */
 #else
-static inline void print_hex_dump(const char *level, const char *prefix_str,
+static inline void print_hex_dump_ext(const char *level, const char *prefix_str,
 				  int prefix_type, int rowsize, int groupsize,
-				  const void *buf, size_t len, bool ascii)
+				  const void *buf, size_t len, u32 flags)
 {
 }
 static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 					const void *buf, size_t len)
 {
 }
-
 #endif
 
+static __always_inline 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)
+{
+	print_hex_dump_ext(level, prefix_str, prefix_type, rowsize, groupsize,
+			buf, len, ascii ? HEXDUMP_ASCII : 0);
+}
+
+
 #if defined(CONFIG_DYNAMIC_DEBUG)
 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,	\
 			     groupsize, buf, len, ascii)	\

@@ -212,8 +212,44 @@ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
 EXPORT_SYMBOL(hex_dump_to_buffer);
 
 #ifdef CONFIG_PRINTK
+
+/**
+ * buf_is_all - Check if a buffer contains only a single byte value
+ * @buf: pointer to the buffer
+ * @len: the size of the buffer in bytes
+ * @val: outputs the value if if the bytes are identical
+ */
+static bool buf_is_all(const u8 *buf, size_t len, u8 *val_out)
+{
+	size_t i;
+	u8 val;
+
+	if (len <= 1)
+		return false;
+
+	val = buf[0];
+
+	for (i = 1; i < len; i++) {
+		if (buf[i] != val)
+			return false;
+	}
+
+	*val_out = val;
+	return true;
+}
+
+static void announce_skipped(const char *level, const char *prefix_str,
+				   u8 val, size_t count)
+{
+	if (count = 0)
+		return;
+
+	printk("%s%s ** Skipped %lu bytes of value 0x%x **\n",
+	       level, prefix_str, count, val);
+}
+
 /**
- * print_hex_dump - print a text hex dump to syslog for a binary blob of data
+ * print_hex_dump_ext - dump a binary blob of data to syslog in hexadecimal
  * @level: kernel log level (e.g. KERN_DEBUG)
  * @prefix_str: string to prefix each line with;
  *  caller supplies trailing spaces for alignment if desired