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

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Message-Id: <20211122233306.155968-2-jarmo.tiitto@gmail.com>
Date:   Tue, 23 Nov 2021 01:33:04 +0200
From:   Jarmo Tiitto <jarmo.tiitto@...il.com>
To:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Bill Wendling <wcw@...gle.com>,
        Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org
Cc:     Jarmo Tiitto <jarmo.tiitto@...il.com>
Subject: [RFC PATCH 1/2] pgo: Update .profraw file format to version 7

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@...il.com>
---
 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