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authorLinus Torvalds <torvalds@linux-foundation.org>2015-11-15 09:36:24 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-15 09:36:24 -0800
commit0ca9b67606f0ce984b5811b0830cfd7d143f6077 (patch)
tree0352af98e9760edd8bbd1712cd0c79f77156217a /tools/lib
parent051b29f2798b5f1a95e745613117eeb367ab4bce (diff)
parent41ac18ebfc429ce3f4d369ef07447d652999a0cd (diff)
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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf updates from Thomas Gleixner: "Mostly updates to the perf tool plus two fixes to the kernel core code: - Handle tracepoint filters correctly for inherited events (Peter Zijlstra) - Prevent a deadlock in perf_lock_task_context (Paul McKenney) - Add missing newlines to some pr_err() calls (Arnaldo Carvalho de Melo) - Print full source file paths when using 'perf annotate --print-line --full-paths' (Michael Petlan) - Fix 'perf probe -d' when just one out of uprobes and kprobes is enabled (Wang Nan) - Add compiler.h to list.h to fix 'make perf-tar-src-pkg' generated tarballs, i.e. out of tree building (Arnaldo Carvalho de Melo) - Add the llvm-src-base.c and llvm-src-kbuild.c files, generated by the 'perf test' LLVM entries, when running it in-tree, to .gitignore (Yunlong Song) - libbpf error reporting improvements, using a strerror interface to more precisely tell the user about problems with the provided scriptlet, be it in C or as a ready made object file (Wang Nan) - Do not be case sensitive when searching for matching 'perf test' entries (Arnaldo Carvalho de Melo) - Inform the user about objdump failures in 'perf annotate' (Andi Kleen) - Improve the LLVM 'perf test' entry, introduce a new ones for BPF and kbuild tests to check the environment used by clang to compile .c scriptlets (Wang Nan)" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (32 commits) perf/x86/intel/rapl: Remove the unused RAPL_EVENT_DESC() macro tools include: Add compiler.h to list.h perf probe: Verify parameters in two functions perf session: Add missing newlines to some pr_err() calls perf annotate: Support full source file paths for srcline fix perf test: Add llvm-src-base.c and llvm-src-kbuild.c to .gitignore perf: Fix inherited events vs. tracepoint filters perf: Disable IRQs across RCU RS CS that acquires scheduler lock perf test: Do not be case sensitive when searching for matching tests perf test: Add 'perf test BPF' perf test: Enhance the LLVM tests: add kbuild test perf test: Enhance the LLVM test: update basic BPF test program perf bpf: Improve BPF related error messages perf tools: Make fetch_kernel_version() publicly available bpf tools: Add new API bpf_object__get_kversion() bpf tools: Improve libbpf error reporting perf probe: Cleanup find_perf_probe_point_from_map to reduce redundancy perf annotate: Inform the user about objdump failures in --stdio perf stat: Make stat options global perf sched latency: Fix thread pid reuse issue ...
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/bpf/.gitignore2
-rw-r--r--tools/lib/bpf/Makefile2
-rw-r--r--tools/lib/bpf/libbpf.c171
-rw-r--r--tools/lib/bpf/libbpf.h23
4 files changed, 144 insertions, 54 deletions
diff --git a/tools/lib/bpf/.gitignore b/tools/lib/bpf/.gitignore
index 812aeedaea38..f81e549ddfdb 100644
--- a/tools/lib/bpf/.gitignore
+++ b/tools/lib/bpf/.gitignore
@@ -1,2 +1,2 @@
libbpf_version.h
-FEATURE-DUMP
+FEATURE-DUMP.libbpf
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index fc9af57b666e..a3caaf3eafbd 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -180,7 +180,7 @@ config-clean:
clean:
$(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so $(VERSION_FILES) .*.d \
$(RM) LIBBPF-CFLAGS
- $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP
+ $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 4252fc22f78f..e176bad19bcb 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -61,6 +61,60 @@ void libbpf_set_print(libbpf_print_fn_t warn,
__pr_debug = debug;
}
+#define STRERR_BUFSIZE 128
+
+#define ERRNO_OFFSET(e) ((e) - __LIBBPF_ERRNO__START)
+#define ERRCODE_OFFSET(c) ERRNO_OFFSET(LIBBPF_ERRNO__##c)
+#define NR_ERRNO (__LIBBPF_ERRNO__END - __LIBBPF_ERRNO__START)
+
+static const char *libbpf_strerror_table[NR_ERRNO] = {
+ [ERRCODE_OFFSET(LIBELF)] = "Something wrong in libelf",
+ [ERRCODE_OFFSET(FORMAT)] = "BPF object format invalid",
+ [ERRCODE_OFFSET(KVERSION)] = "'version' section incorrect or lost",
+ [ERRCODE_OFFSET(ENDIAN)] = "Endian missmatch",
+ [ERRCODE_OFFSET(INTERNAL)] = "Internal error in libbpf",
+ [ERRCODE_OFFSET(RELOC)] = "Relocation failed",
+ [ERRCODE_OFFSET(VERIFY)] = "Kernel verifier blocks program loading",
+ [ERRCODE_OFFSET(PROG2BIG)] = "Program too big",
+ [ERRCODE_OFFSET(KVER)] = "Incorrect kernel version",
+};
+
+int libbpf_strerror(int err, char *buf, size_t size)
+{
+ if (!buf || !size)
+ return -1;
+
+ err = err > 0 ? err : -err;
+
+ if (err < __LIBBPF_ERRNO__START) {
+ int ret;
+
+ ret = strerror_r(err, buf, size);
+ buf[size - 1] = '\0';
+ return ret;
+ }
+
+ if (err < __LIBBPF_ERRNO__END) {
+ const char *msg;
+
+ msg = libbpf_strerror_table[ERRNO_OFFSET(err)];
+ snprintf(buf, size, "%s", msg);
+ buf[size - 1] = '\0';
+ return 0;
+ }
+
+ snprintf(buf, size, "Unknown libbpf error %d", err);
+ buf[size - 1] = '\0';
+ return -1;
+}
+
+#define CHECK_ERR(action, err, out) do { \
+ err = action; \
+ if (err) \
+ goto out; \
+} while(0)
+
+
/* Copied from tools/perf/util/util.h */
#ifndef zfree
# define zfree(ptr) ({ free(*ptr); *ptr = NULL; })
@@ -258,7 +312,7 @@ static struct bpf_object *bpf_object__new(const char *path,
obj = calloc(1, sizeof(struct bpf_object) + strlen(path) + 1);
if (!obj) {
pr_warning("alloc memory failed for %s\n", path);
- return NULL;
+ return ERR_PTR(-ENOMEM);
}
strcpy(obj->path, path);
@@ -305,7 +359,7 @@ static int bpf_object__elf_init(struct bpf_object *obj)
if (obj_elf_valid(obj)) {
pr_warning("elf init: internal error\n");
- return -EEXIST;
+ return -LIBBPF_ERRNO__LIBELF;
}
if (obj->efile.obj_buf_sz > 0) {
@@ -331,14 +385,14 @@ static int bpf_object__elf_init(struct bpf_object *obj)
if (!obj->efile.elf) {
pr_warning("failed to open %s as ELF file\n",
obj->path);
- err = -EINVAL;
+ err = -LIBBPF_ERRNO__LIBELF;
goto errout;
}
if (!gelf_getehdr(obj->efile.elf, &obj->efile.ehdr)) {
pr_warning("failed to get EHDR from %s\n",
obj->path);
- err = -EINVAL;
+ err = -LIBBPF_ERRNO__FORMAT;
goto errout;
}
ep = &obj->efile.ehdr;
@@ -346,7 +400,7 @@ static int bpf_object__elf_init(struct bpf_object *obj)
if ((ep->e_type != ET_REL) || (ep->e_machine != 0)) {
pr_warning("%s is not an eBPF object file\n",
obj->path);
- err = -EINVAL;
+ err = -LIBBPF_ERRNO__FORMAT;
goto errout;
}
@@ -374,14 +428,14 @@ bpf_object__check_endianness(struct bpf_object *obj)
goto mismatch;
break;
default:
- return -EINVAL;
+ return -LIBBPF_ERRNO__ENDIAN;
}
return 0;
mismatch:
pr_warning("Error: endianness mismatch.\n");
- return -EINVAL;
+ return -LIBBPF_ERRNO__ENDIAN;
}
static int
@@ -402,7 +456,7 @@ bpf_object__init_kversion(struct bpf_object *obj,
if (size != sizeof(kver)) {
pr_warning("invalid kver section in %s\n", obj->path);
- return -EINVAL;
+ return -LIBBPF_ERRNO__FORMAT;
}
memcpy(&kver, data, sizeof(kver));
obj->kern_version = kver;
@@ -444,7 +498,7 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) {
pr_warning("failed to get e_shstrndx from %s\n",
obj->path);
- return -EINVAL;
+ return -LIBBPF_ERRNO__FORMAT;
}
while ((scn = elf_nextscn(elf, scn)) != NULL) {
@@ -456,7 +510,7 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
if (gelf_getshdr(scn, &sh) != &sh) {
pr_warning("failed to get section header from %s\n",
obj->path);
- err = -EINVAL;
+ err = -LIBBPF_ERRNO__FORMAT;
goto out;
}
@@ -464,7 +518,7 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
if (!name) {
pr_warning("failed to get section name from %s\n",
obj->path);
- err = -EINVAL;
+ err = -LIBBPF_ERRNO__FORMAT;
goto out;
}
@@ -472,7 +526,7 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
if (!data) {
pr_warning("failed to get section data from %s(%s)\n",
name, obj->path);
- err = -EINVAL;
+ err = -LIBBPF_ERRNO__FORMAT;
goto out;
}
pr_debug("section %s, size %ld, link %d, flags %lx, type=%d\n",
@@ -495,7 +549,7 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
if (obj->efile.symbols) {
pr_warning("bpf: multiple SYMTAB in %s\n",
obj->path);
- err = -EEXIST;
+ err = -LIBBPF_ERRNO__FORMAT;
} else
obj->efile.symbols = data;
} else if ((sh.sh_type == SHT_PROGBITS) &&
@@ -504,7 +558,8 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
err = bpf_object__add_program(obj, data->d_buf,
data->d_size, name, idx);
if (err) {
- char errmsg[128];
+ char errmsg[STRERR_BUFSIZE];
+
strerror_r(-err, errmsg, sizeof(errmsg));
pr_warning("failed to alloc program %s (%s): %s",
name, obj->path, errmsg);
@@ -576,7 +631,7 @@ bpf_program__collect_reloc(struct bpf_program *prog,
if (!gelf_getrel(data, i, &rel)) {
pr_warning("relocation: failed to get %d reloc\n", i);
- return -EINVAL;
+ return -LIBBPF_ERRNO__FORMAT;
}
insn_idx = rel.r_offset / sizeof(struct bpf_insn);
@@ -587,20 +642,20 @@ bpf_program__collect_reloc(struct bpf_program *prog,
&sym)) {
pr_warning("relocation: symbol %"PRIx64" not found\n",
GELF_R_SYM(rel.r_info));
- return -EINVAL;
+ return -LIBBPF_ERRNO__FORMAT;
}
if (insns[insn_idx].code != (BPF_LD | BPF_IMM | BPF_DW)) {
pr_warning("bpf: relocation: invalid relo for insns[%d].code 0x%x\n",
insn_idx, insns[insn_idx].code);
- return -EINVAL;
+ return -LIBBPF_ERRNO__RELOC;
}
map_idx = sym.st_value / sizeof(struct bpf_map_def);
if (map_idx >= nr_maps) {
pr_warning("bpf relocation: map_idx %d large than %d\n",
(int)map_idx, (int)nr_maps - 1);
- return -EINVAL;
+ return -LIBBPF_ERRNO__RELOC;
}
prog->reloc_desc[i].insn_idx = insn_idx;
@@ -683,7 +738,7 @@ bpf_program__relocate(struct bpf_program *prog, int *map_fds)
if (insn_idx >= (int)prog->insns_cnt) {
pr_warning("relocation out of range: '%s'\n",
prog->section_name);
- return -ERANGE;
+ return -LIBBPF_ERRNO__RELOC;
}
insns[insn_idx].src_reg = BPF_PSEUDO_MAP_FD;
insns[insn_idx].imm = map_fds[map_idx];
@@ -721,7 +776,7 @@ static int bpf_object__collect_reloc(struct bpf_object *obj)
if (!obj_elf_valid(obj)) {
pr_warning("Internal error: elf object is closed\n");
- return -EINVAL;
+ return -LIBBPF_ERRNO__INTERNAL;
}
for (i = 0; i < obj->efile.nr_reloc; i++) {
@@ -734,21 +789,21 @@ static int bpf_object__collect_reloc(struct bpf_object *obj)
if (shdr->sh_type != SHT_REL) {
pr_warning("internal error at %d\n", __LINE__);
- return -EINVAL;
+ return -LIBBPF_ERRNO__INTERNAL;
}
prog = bpf_object__find_prog_by_idx(obj, idx);
if (!prog) {
pr_warning("relocation failed: no %d section\n",
idx);
- return -ENOENT;
+ return -LIBBPF_ERRNO__RELOC;
}
err = bpf_program__collect_reloc(prog, nr_maps,
shdr, data,
obj->efile.symbols);
if (err)
- return -EINVAL;
+ return err;
}
return 0;
}
@@ -777,13 +832,23 @@ load_program(struct bpf_insn *insns, int insns_cnt,
goto out;
}
- ret = -EINVAL;
+ ret = -LIBBPF_ERRNO__LOAD;
pr_warning("load bpf program failed: %s\n", strerror(errno));
- if (log_buf) {
+ if (log_buf && log_buf[0] != '\0') {
+ ret = -LIBBPF_ERRNO__VERIFY;
pr_warning("-- BEGIN DUMP LOG ---\n");
pr_warning("\n%s\n", log_buf);
pr_warning("-- END LOG --\n");
+ } else {
+ if (insns_cnt >= BPF_MAXINSNS) {
+ pr_warning("Program too large (%d insns), at most %d insns\n",
+ insns_cnt, BPF_MAXINSNS);
+ ret = -LIBBPF_ERRNO__PROG2BIG;
+ } else if (log_buf) {
+ pr_warning("log buffer is empty\n");
+ ret = -LIBBPF_ERRNO__KVER;
+ }
}
out:
@@ -831,7 +896,7 @@ static int bpf_object__validate(struct bpf_object *obj)
if (obj->kern_version == 0) {
pr_warning("%s doesn't provide kernel version\n",
obj->path);
- return -EINVAL;
+ return -LIBBPF_ERRNO__KVERSION;
}
return 0;
}
@@ -840,32 +905,28 @@ static struct bpf_object *
__bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz)
{
struct bpf_object *obj;
+ int err;
if (elf_version(EV_CURRENT) == EV_NONE) {
pr_warning("failed to init libelf for %s\n", path);
- return NULL;
+ return ERR_PTR(-LIBBPF_ERRNO__LIBELF);
}
obj = bpf_object__new(path, obj_buf, obj_buf_sz);
- if (!obj)
- return NULL;
+ if (IS_ERR(obj))
+ return obj;
- if (bpf_object__elf_init(obj))
- goto out;
- if (bpf_object__check_endianness(obj))
- goto out;
- if (bpf_object__elf_collect(obj))
- goto out;
- if (bpf_object__collect_reloc(obj))
- goto out;
- if (bpf_object__validate(obj))
- goto out;
+ CHECK_ERR(bpf_object__elf_init(obj), err, out);
+ CHECK_ERR(bpf_object__check_endianness(obj), err, out);
+ CHECK_ERR(bpf_object__elf_collect(obj), err, out);
+ CHECK_ERR(bpf_object__collect_reloc(obj), err, out);
+ CHECK_ERR(bpf_object__validate(obj), err, out);
bpf_object__elf_finish(obj);
return obj;
out:
bpf_object__close(obj);
- return NULL;
+ return ERR_PTR(err);
}
struct bpf_object *bpf_object__open(const char *path)
@@ -922,6 +983,8 @@ int bpf_object__unload(struct bpf_object *obj)
int bpf_object__load(struct bpf_object *obj)
{
+ int err;
+
if (!obj)
return -EINVAL;
@@ -931,18 +994,16 @@ int bpf_object__load(struct bpf_object *obj)
}
obj->loaded = true;
- if (bpf_object__create_maps(obj))
- goto out;
- if (bpf_object__relocate(obj))
- goto out;
- if (bpf_object__load_progs(obj))
- goto out;
+
+ CHECK_ERR(bpf_object__create_maps(obj), err, out);
+ CHECK_ERR(bpf_object__relocate(obj), err, out);
+ CHECK_ERR(bpf_object__load_progs(obj), err, out);
return 0;
out:
bpf_object__unload(obj);
pr_warning("failed to load object '%s'\n", obj->path);
- return -EINVAL;
+ return err;
}
void bpf_object__close(struct bpf_object *obj)
@@ -990,10 +1051,18 @@ const char *
bpf_object__get_name(struct bpf_object *obj)
{
if (!obj)
- return NULL;
+ return ERR_PTR(-EINVAL);
return obj->path;
}
+unsigned int
+bpf_object__get_kversion(struct bpf_object *obj)
+{
+ if (!obj)
+ return 0;
+ return obj->kern_version;
+}
+
struct bpf_program *
bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
{
@@ -1034,16 +1103,16 @@ int bpf_program__get_private(struct bpf_program *prog, void **ppriv)
return 0;
}
-const char *bpf_program__title(struct bpf_program *prog, bool dup)
+const char *bpf_program__title(struct bpf_program *prog, bool needs_copy)
{
const char *title;
title = prog->section_name;
- if (dup) {
+ if (needs_copy) {
title = strdup(title);
if (!title) {
pr_warning("failed to strdup program title\n");
- return NULL;
+ return ERR_PTR(-ENOMEM);
}
}
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index f16170c95ffd..c9a9aef2806c 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -10,6 +10,26 @@
#include <stdio.h>
#include <stdbool.h>
+#include <linux/err.h>
+
+enum libbpf_errno {
+ __LIBBPF_ERRNO__START = 4000,
+
+ /* Something wrong in libelf */
+ LIBBPF_ERRNO__LIBELF = __LIBBPF_ERRNO__START,
+ LIBBPF_ERRNO__FORMAT, /* BPF object format invalid */
+ LIBBPF_ERRNO__KVERSION, /* Incorrect or no 'version' section */
+ LIBBPF_ERRNO__ENDIAN, /* Endian missmatch */
+ LIBBPF_ERRNO__INTERNAL, /* Internal error in libbpf */
+ LIBBPF_ERRNO__RELOC, /* Relocation failed */
+ LIBBPF_ERRNO__LOAD, /* Load program failure for unknown reason */
+ LIBBPF_ERRNO__VERIFY, /* Kernel verifier blocks program loading */
+ LIBBPF_ERRNO__PROG2BIG, /* Program too big */
+ LIBBPF_ERRNO__KVER, /* Incorrect kernel version */
+ __LIBBPF_ERRNO__END,
+};
+
+int libbpf_strerror(int err, char *buf, size_t size);
/*
* In include/linux/compiler-gcc.h, __printf is defined. However
@@ -36,6 +56,7 @@ void bpf_object__close(struct bpf_object *object);
int bpf_object__load(struct bpf_object *obj);
int bpf_object__unload(struct bpf_object *obj);
const char *bpf_object__get_name(struct bpf_object *obj);
+unsigned int bpf_object__get_kversion(struct bpf_object *obj);
struct bpf_object *bpf_object__next(struct bpf_object *prev);
#define bpf_object__for_each_safe(pos, tmp) \
@@ -63,7 +84,7 @@ int bpf_program__set_private(struct bpf_program *prog, void *priv,
int bpf_program__get_private(struct bpf_program *prog,
void **ppriv);
-const char *bpf_program__title(struct bpf_program *prog, bool dup);
+const char *bpf_program__title(struct bpf_program *prog, bool needs_copy);
int bpf_program__fd(struct bpf_program *prog);