From 43798bf37215fe242e592fd4605d804e2da0781b Mon Sep 17 00:00:00 2001 From: He Kuang Date: Tue, 24 Nov 2015 13:36:08 +0000 Subject: bpf tools: Add helper function for updating bpf maps elements Add bpf_map_update_elem() helper function which calls the sys_bpf syscall to update elements in bpf maps. Upcoming patches will use it to adjust data in map through the perf command line. Signed-off-by: He Kuang Cc: Alexei Starovoitov Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Wang Nan Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1448372181-151723-4-git-send-email-wangnan0@huawei.com Signed-off-by: Wang Nan Signed-off-by: Arnaldo Carvalho de Melo --- tools/lib/bpf/bpf.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'tools/lib/bpf/bpf.c') diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index a6331050ab79..5bdc6eab6852 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -83,3 +83,17 @@ int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns, log_buf[0] = 0; return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr)); } + +int bpf_map_update_elem(int fd, void *key, void *value, + u64 flags) +{ + union bpf_attr attr; + + bzero(&attr, sizeof(attr)); + attr.map_fd = fd; + attr.key = ptr_to_u64(key); + attr.value = ptr_to_u64(value); + attr.flags = flags; + + return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); +} -- cgit v1.2.3 From 8f9e05fb298f16c0cda2e7e78b603331a79f9c10 Mon Sep 17 00:00:00 2001 From: Wang Nan Date: Mon, 11 Jan 2016 13:47:57 +0000 Subject: perf tools: Fix PowerPC native building Checks BPF syscall number, turn off libbpf building on platform doesn't correctly support sys_bpf instead of blocking compiling. Reported-and-Tested-by: Naveen N. Rao Signed-off-by: Wang Nan Acked-by: Jiri Olsa Cc: Sukadev Bhattiprolu Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1452520124-2073-7-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/build/feature/test-bpf.c | 20 +++++++++++++++++++- tools/lib/bpf/bpf.c | 4 ++-- 2 files changed, 21 insertions(+), 3 deletions(-) (limited to 'tools/lib/bpf/bpf.c') diff --git a/tools/build/feature/test-bpf.c b/tools/build/feature/test-bpf.c index 062bac811af9..b389026839b9 100644 --- a/tools/build/feature/test-bpf.c +++ b/tools/build/feature/test-bpf.c @@ -1,9 +1,23 @@ +#include #include +#include + +#ifndef __NR_bpf +# if defined(__i386__) +# define __NR_bpf 357 +# elif defined(__x86_64__) +# define __NR_bpf 321 +# elif defined(__aarch64__) +# define __NR_bpf 280 +# error __NR_bpf not defined. libbpf does not support your arch. +# endif +#endif int main(void) { union bpf_attr attr; + /* Check fields in attr */ attr.prog_type = BPF_PROG_TYPE_KPROBE; attr.insn_cnt = 0; attr.insns = 0; @@ -14,5 +28,9 @@ int main(void) attr.kern_version = 0; attr = attr; - return 0; + /* + * Test existence of __NR_bpf and BPF_PROG_LOAD. + * This call should fail if we run the testcase. + */ + return syscall(__NR_bpf, BPF_PROG_LOAD, attr, sizeof(attr)); } diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 5bdc6eab6852..1f91cc941b7c 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -14,8 +14,8 @@ #include "bpf.h" /* - * When building perf, unistd.h is override. Define __NR_bpf is - * required to be defined. + * When building perf, unistd.h is overrided. __NR_bpf is + * required to be defined explicitly. */ #ifndef __NR_bpf # if defined(__i386__) -- cgit v1.2.3