Messages in this thread Patch in this message | | | From | Jiri Olsa <> | Subject | [PATCH 04/12] perf tools: Add bpf dso read and size hooks | Date | Wed, 8 May 2019 15:20:02 +0200 |
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Adding bpf related code into dso reading paths to return size (bpf_size) and read the bpf code (bpf_read).
Link: http://lkml.kernel.org/n/tip-ql6jpegvv5823yc87u0hlzfa@git.kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org> --- 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..2c9289621efd 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 *) 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); } -- 2.20.1
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