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Subject[PATCH v3 09/10] perf env: Set kernel bit mode
Date
It's useful to know that the kernel is running in 32-bit or 64-bit
mode. E.g. We can decide perf tool is running in compat mode when
detects kernel is running in 64-bit mode and the tool is in 32-bit
mode with the compiler macro BITS_PER_LONG is 32.

This patch adds a global variable "kernel_is_64_bit", during the
environment initialization for the session, the kernel running mode
is decided by checking the architecture string.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
tools/perf/util/env.c | 17 ++++++++++++++++-
tools/perf/util/env.h | 1 +
2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index ebc5e9ad35db..345635a2e842 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -11,6 +11,7 @@
#include <stdlib.h>
#include <string.h>

+int kernel_is_64_bit;
struct perf_env perf_env;

#ifdef HAVE_LIBBPF_SUPPORT
@@ -172,6 +173,19 @@ static void perf_env__purge_bpf(struct perf_env *env __maybe_unused)
}
#endif // HAVE_LIBBPF_SUPPORT

+static void perf_env__init_kernel_mode(struct perf_env *env)
+{
+ const char *arch = perf_env__raw_arch(env);
+
+ if (!strncmp(arch, "x86_64", 6) || !strncmp(arch, "aarch64", 7) ||
+ !strncmp(arch, "arm64", 5) || !strncmp(arch, "mips64", 6) ||
+ !strncmp(arch, "parisc64", 8) || !strncmp(arch, "riscv64", 7) ||
+ !strncmp(arch, "s390x", 5) || !strncmp(arch, "sparc64", 7))
+ kernel_is_64_bit = 1;
+ else
+ kernel_is_64_bit = 0;
+}
+
void perf_env__exit(struct perf_env *env)
{
int i;
@@ -217,13 +231,14 @@ void perf_env__exit(struct perf_env *env)
zfree(&env->hybrid_cpc_nodes);
}

-void perf_env__init(struct perf_env *env __maybe_unused)
+void perf_env__init(struct perf_env *env)
{
#ifdef HAVE_LIBBPF_SUPPORT
env->bpf_progs.infos = RB_ROOT;
env->bpf_progs.btfs = RB_ROOT;
init_rwsem(&env->bpf_progs.lock);
#endif
+ perf_env__init_kernel_mode(env);
}

int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[])
diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
index 6824a7423a2d..cc989ff49740 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -139,6 +139,7 @@ enum perf_compress_type {
struct bpf_prog_info_node;
struct btf_node;

+extern int kernel_is_64_bit;
extern struct perf_env perf_env;

void perf_env__exit(struct perf_env *env);
--
2.25.1
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