[RFC PATCH 1/2] pgo: Update .profraw file format to version 7

From: Jarmo Tiitto
Date: Mon Nov 22 2021 - 20:22:35 EST


Recent LLVM-13 can't read the version 5 profile file any more
so update the format to .profraw file version 7.

This version adds binary_ids_size entry to struct llvm_prf_header
and it is output as zero.

This is enough to fix processing the profile data on LLVM-13 tools.

Signed-off-by: Jarmo Tiitto <jarmo.tiitto@xxxxxxxxx>
---
kernel/pgo/fs.c | 1 +
kernel/pgo/pgo.h | 4 +++-
2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/pgo/fs.c b/kernel/pgo/fs.c
index 3c5aa7c2a4ce..77d23f869503 100644
--- a/kernel/pgo/fs.c
+++ b/kernel/pgo/fs.c
@@ -62,6 +62,7 @@ static void prf_fill_header(void **buffer)
#endif
header->version = LLVM_VARIANT_MASK_IR_PROF | LLVM_INSTR_PROF_RAW_VERSION;
header->data_size = prf_data_count();
+ header->binary_ids_size = 0;
header->padding_bytes_before_counters = 0;
header->counters_size = prf_cnts_count();
header->padding_bytes_after_counters = 0;
diff --git a/kernel/pgo/pgo.h b/kernel/pgo/pgo.h
index 04fbf3bcde1e..45eeff9ab6c4 100644
--- a/kernel/pgo/pgo.h
+++ b/kernel/pgo/pgo.h
@@ -43,7 +43,7 @@
(u64)'R' << 8 | \
(u64)129)

-#define LLVM_INSTR_PROF_RAW_VERSION 5
+#define LLVM_INSTR_PROF_RAW_VERSION 7
#define LLVM_INSTR_PROF_DATA_ALIGNMENT 8
#define LLVM_INSTR_PROF_IPVK_FIRST 0
#define LLVM_INSTR_PROF_IPVK_LAST 1
@@ -56,6 +56,7 @@
* struct llvm_prf_header - represents the raw profile header data structure.
* @magic: the magic token for the file format.
* @version: the version of the file format.
+ * @binary_ids_size: the number of binary ids. (since LLVM_INSTR_PROF_RAW_VERSION >= 7)
* @data_size: the number of entries in the profile data section.
* @padding_bytes_before_counters: the number of padding bytes before the
* counters.
@@ -72,6 +73,7 @@
struct llvm_prf_header {
u64 magic;
u64 version;
+ u64 binary_ids_size;
u64 data_size;
u64 padding_bytes_before_counters;
u64 counters_size;
--
2.34.0