Commit-ID: 6c398d723a6a6d27485e701ae21e50304ec95595 Gitweb: https://git.kernel.org/tip/6c398d723a6a6d27485e701ae21e50304ec95595 Author: Jiri Olsa <jo...@kernel.org> AuthorDate: Wed, 8 May 2019 15:20:02 +0200 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Tue, 28 May 2019 18:37:44 -0300
perf dso: Add BPF DSO read and size hooks Add BPF related code into DSO reading paths to return size (bpf_size) and read the BPF code (bpf_read). Signed-off-by: Jiri Olsa <jo...@kernel.org> Acked-by: Song Liu <songliubrav...@fb.com> Cc: Adrian Hunter <adrian.hun...@intel.com> Cc: Alexander Shishkin <alexander.shish...@linux.intel.com> Cc: Andi Kleen <a...@linux.intel.com> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Stanislav Fomichev <s...@google.com> Link: http://lkml.kernel.org/r/20190508132010.14512-5-jo...@kernel.org [ Use uintptr_t when casting from u64 to u8 pointers ] Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- tools/perf/util/dso.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 48 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c index 1e6a045adb8c..1fb18292c2d3 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -9,6 +9,8 @@ #include <errno.h> #include <fcntl.h> #include <libgen.h> +#include <bpf/libbpf.h> +#include "bpf-event.h" #include "compress.h" #include "namespaces.h" #include "path.h" @@ -706,6 +708,44 @@ bool dso__data_status_seen(struct dso *dso, enum dso_data_status_seen by) return false; } +static ssize_t bpf_read(struct dso *dso, u64 offset, char *data) +{ + struct bpf_prog_info_node *node; + ssize_t size = DSO__DATA_CACHE_SIZE; + u64 len; + u8 *buf; + + node = perf_env__find_bpf_prog_info(dso->bpf_prog.env, dso->bpf_prog.id); + if (!node || !node->info_linear) { + dso->data.status = DSO_DATA_STATUS_ERROR; + return -1; + } + + len = node->info_linear->info.jited_prog_len; + buf = (u8 *)(uintptr_t)node->info_linear->info.jited_prog_insns; + + if (offset >= len) + return -1; + + size = (ssize_t)min(len - offset, (u64)size); + memcpy(data, buf + offset, size); + return size; +} + +static int bpf_size(struct dso *dso) +{ + struct bpf_prog_info_node *node; + + node = perf_env__find_bpf_prog_info(dso->bpf_prog.env, dso->bpf_prog.id); + if (!node || !node->info_linear) { + dso->data.status = DSO_DATA_STATUS_ERROR; + return -1; + } + + dso->data.file_size = node->info_linear->info.jited_prog_len; + return 0; +} + static void dso_cache__free(struct dso *dso) { @@ -832,7 +872,11 @@ dso_cache__read(struct dso *dso, struct machine *machine, if (!cache) return -ENOMEM; - ret = file_read(dso, machine, cache_offset, cache->data); + if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO) + ret = bpf_read(dso, cache_offset, cache->data); + else + ret = file_read(dso, machine, cache_offset, cache->data); + if (ret > 0) { cache->offset = cache_offset; cache->size = ret; @@ -941,6 +985,9 @@ int dso__data_file_size(struct dso *dso, struct machine *machine) if (dso->data.status == DSO_DATA_STATUS_ERROR) return -1; + if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO) + return bpf_size(dso); + return file_size(dso, machine); }
