[PATCH 02/10] perf hisi-ptt: Fix PTT trace TLP Header parsing
From: Sizhe Liu
Date: Thu Jun 04 2026 - 03:54:48 EST
The DW0 bit field layout of the hisi_ptt_4dw union does not match the
actual bit ordering in little-endian memory, causing incorrect field
extraction. Reorder the struct members from LSB to MSB to match the
le32_to_cpu() conversion.
Also print all DW hex values in big-endian byte order for readability,
matching the bit field layout shown in the format diagram.
4DW format is like:
bits [31:30] [ 29:25 ][24][23][22][21][ 20:11 ][ 10:0 ]
|-----|---------|---|---|---|---|-------------|-------------|
DW0 [ Fmt ][ Type ][T9][T8][TH][SO][ Length ][ Time ]
DW1 [ Header DW1 ]
DW2 [ Header DW2 ]
DW3 [ Header DW3 ]
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 5e91e57e6809 ("perf auxtrace arm64: Add support for parsing HiSilicon PCIe Trace packet")
Signed-off-by: Sizhe Liu <liusizhe5@xxxxxxxxxx>
---
Documentation/trace/hisi-ptt.rst | 28 ++++++++--------
.../hisi-ptt-decoder/hisi-ptt-pkt-decoder.c | 33 ++++++++++++-------
2 files changed, 35 insertions(+), 26 deletions(-)
diff --git a/Documentation/trace/hisi-ptt.rst b/Documentation/trace/hisi-ptt.rst
index 6eef28ebb0c7..f6a2655f99e5 100644
--- a/Documentation/trace/hisi-ptt.rst
+++ b/Documentation/trace/hisi-ptt.rst
@@ -285,20 +285,20 @@ according to the format described previously (take 8DW as an example):
[...perf headers and other information]
. ... HISI PTT data: size 4194304 bytes
. 00000000: 00 00 00 00 Prefix
- . 00000004: 01 00 00 60 Header DW0
- . 00000008: 0f 1e 00 01 Header DW1
- . 0000000c: 04 00 00 00 Header DW2
- . 00000010: 40 00 81 02 Header DW3
- . 00000014: 33 c0 04 00 Time
+ . 00000004: 60 00 00 01 Header DW0
+ . 00000008: 01 00 1e 0f Header DW1
+ . 0000000c: 00 00 00 04 Header DW2
+ . 00000010: 02 81 00 40 Header DW3
+ . 00000014: 00 04 c0 33 Time
. 00000020: 00 00 00 00 Prefix
- . 00000024: 01 00 00 60 Header DW0
- . 00000028: 0f 1e 00 01 Header DW1
- . 0000002c: 04 00 00 00 Header DW2
- . 00000030: 40 00 81 02 Header DW3
- . 00000034: 02 00 00 00 Time
+ . 00000024: 60 00 00 01 Header DW0
+ . 00000028: 01 00 1e 0f Header DW1
+ . 0000002c: 00 00 00 04 Header DW2
+ . 00000030: 02 81 00 40 Header DW3
+ . 00000034: 00 00 00 02 Time
. 00000040: 00 00 00 00 Prefix
- . 00000044: 01 00 00 60 Header DW0
- . 00000048: 0f 1e 00 01 Header DW1
- . 0000004c: 04 00 00 00 Header DW2
- . 00000050: 40 00 81 02 Header DW3
+ . 00000044: 60 00 00 01 Header DW0
+ . 00000048: 01 00 1e 0f Header DW1
+ . 0000004c: 00 00 00 04 Header DW2
+ . 00000050: 02 81 00 40 Header DW3
[...]
diff --git a/tools/perf/util/hisi-ptt-decoder/hisi-ptt-pkt-decoder.c b/tools/perf/util/hisi-ptt-decoder/hisi-ptt-pkt-decoder.c
index c48b2ce7c4a3..67024f18ebbb 100644
--- a/tools/perf/util/hisi-ptt-decoder/hisi-ptt-pkt-decoder.c
+++ b/tools/perf/util/hisi-ptt-decoder/hisi-ptt-pkt-decoder.c
@@ -11,6 +11,7 @@
#include <byteswap.h>
#include <linux/bitops.h>
#include <stdarg.h>
+#include <linux/kernel.h>
#include "../color.h"
#include "hisi-ptt-pkt-decoder.h"
@@ -75,14 +76,14 @@ static const char * const hisi_ptt_4dw_pkt_field_name[] = {
union hisi_ptt_4dw {
struct {
- uint32_t format : 2;
- uint32_t type : 5;
- uint32_t t9 : 1;
- uint32_t t8 : 1;
- uint32_t th : 1;
- uint32_t so : 1;
- uint32_t len : 10;
uint32_t time : 11;
+ uint32_t len : 10;
+ uint32_t so : 1;
+ uint32_t th : 1;
+ uint32_t t8 : 1;
+ uint32_t t9 : 1;
+ uint32_t type : 5;
+ uint32_t format : 2;
};
uint32_t value;
};
@@ -90,12 +91,17 @@ union hisi_ptt_4dw {
static void hisi_ptt_print_pkt(const unsigned char *buf, int pos, const char *desc)
{
const char *color = PERF_COLOR_BLUE;
+ uint32_t value;
+ uint8_t byte;
int i;
+ value = le32_to_cpu(*(__le32 *)(buf + pos));
printf(".");
color_fprintf(stdout, color, " %08x: ", pos);
- for (i = 0; i < HISI_PTT_FIELD_LENGTH; i++)
- color_fprintf(stdout, color, "%02x ", buf[pos + i]);
+ for (i = 0; i < HISI_PTT_FIELD_LENGTH; i++) {
+ byte = (value >> (24 - i * 8)) & 0xFF;
+ color_fprintf(stdout, color, "%02x ", byte);
+ }
for (i = 0; i < HISI_PTT_MAX_SPACE_LEN; i++)
color_fprintf(stdout, color, " ");
color_fprintf(stdout, color, " %s\n", desc);
@@ -123,13 +129,16 @@ static void hisi_ptt_4dw_print_dw0(const unsigned char *buf, int pos)
{
const char *color = PERF_COLOR_BLUE;
union hisi_ptt_4dw dw0;
+ uint8_t byte;
int i;
- dw0.value = *(uint32_t *)(buf + pos);
+ dw0.value = le32_to_cpu(*(__le32 *)(buf + pos));
printf(".");
color_fprintf(stdout, color, " %08x: ", pos);
- for (i = 0; i < HISI_PTT_FIELD_LENGTH; i++)
- color_fprintf(stdout, color, "%02x ", buf[pos + i]);
+ for (i = 0; i < HISI_PTT_FIELD_LENGTH; i++) {
+ byte = (dw0.value >> (24 - i * 8)) & 0xFF;
+ color_fprintf(stdout, color, "%02x ", byte);
+ }
for (i = 0; i < HISI_PTT_MAX_SPACE_LEN; i++)
color_fprintf(stdout, color, " ");
--
2.33.0