[PATCH 15/19] perf tools: Add lzma decompression support for kernel module
From: Arnaldo Carvalho de Melo
Date: Sat Mar 21 2015 - 14:55:53 EST
From: Jiri Olsa <jolsa@xxxxxxxxxx>
In short, Fedora compresses kernel modules now (since version 21) with
lzma compression.
Adding lzma decompress support into the dso.c:compressions array
introduced by Namhyung earlier.
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-2glp65kdtbrk0gblmirsjsnt@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/Makefile.perf | 2 +
tools/perf/config/Makefile | 11 ++++++
tools/perf/util/Build | 1 +
tools/perf/util/dso.c | 3 ++
tools/perf/util/lzma.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/util.h | 4 ++
6 files changed, 116 insertions(+)
create mode 100644 tools/perf/util/lzma.c
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index d5b9e0dae334..e9925e6ad1d0 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -71,6 +71,8 @@ include config/utilities.mak
#
# Define NO_LIBBABELTRACE if you do not want libbabeltrace support
# for CTF data format.
+#
+# Define NO_LZMA if you do not want to support compressed (xz) kernel modules
ifeq ($(srctree),)
srctree := $(patsubst %/,%,$(dir $(shell pwd)))
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 6d1918a6b83b..cd121dfc4de9 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -541,6 +541,17 @@ ifndef NO_ZLIB
endif
endif
+ifndef NO_LZMA
+ ifeq ($(feature-lzma), 1)
+ CFLAGS += -DHAVE_LZMA_SUPPORT
+ EXTLIBS += -llzma
+ $(call detected,CONFIG_LZMA)
+ else
+ msg := $(warning No liblzma found, disables xz kernel module decompression, please install xz-devel/liblzma-dev);
+ NO_LZMA := 1
+ endif
+endif
+
ifndef NO_BACKTRACE
ifeq ($(feature-backtrace), 1)
CFLAGS += -DHAVE_BACKTRACE_SUPPORT
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 972a6e0da7ad..797490a40075 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -94,6 +94,7 @@ libperf-y += scripting-engines/
libperf-$(CONFIG_PERF_REGS) += perf_regs.o
libperf-$(CONFIG_ZLIB) += zlib.o
+libperf-$(CONFIG_LZMA) += lzma.o
CFLAGS_config.o += -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
CFLAGS_exec_cmd.o += -DPERF_EXEC_PATH="BUILD_STR($(perfexecdir_SQ))" -DPREFIX="BUILD_STR($(prefix_SQ))"
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 814554d1b857..be368414036c 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -148,6 +148,9 @@ static const struct {
#ifdef HAVE_ZLIB_SUPPORT
{ "gz", gzip_decompress_to_file },
#endif
+#ifdef HAVE_LZMA_SUPPORT
+ { "xz", lzma_decompress_to_file },
+#endif
{ NULL, NULL },
};
diff --git a/tools/perf/util/lzma.c b/tools/perf/util/lzma.c
new file mode 100644
index 000000000000..95a1acb61245
--- /dev/null
+++ b/tools/perf/util/lzma.c
@@ -0,0 +1,95 @@
+#include <lzma.h>
+#include <stdio.h>
+#include <linux/compiler.h>
+#include "util.h"
+#include "debug.h"
+
+#define BUFSIZE 8192
+
+static const char *lzma_strerror(lzma_ret ret)
+{
+ switch ((int) ret) {
+ case LZMA_MEM_ERROR:
+ return "Memory allocation failed";
+ case LZMA_OPTIONS_ERROR:
+ return "Unsupported decompressor flags";
+ case LZMA_FORMAT_ERROR:
+ return "The input is not in the .xz format";
+ case LZMA_DATA_ERROR:
+ return "Compressed file is corrupt";
+ case LZMA_BUF_ERROR:
+ return "Compressed file is truncated or otherwise corrupt";
+ default:
+ return "Unknown error, possibly a bug";
+ }
+}
+
+int lzma_decompress_to_file(const char *input, int output_fd)
+{
+ lzma_action action = LZMA_RUN;
+ lzma_stream strm = LZMA_STREAM_INIT;
+ lzma_ret ret;
+
+ u8 buf_in[BUFSIZE];
+ u8 buf_out[BUFSIZE];
+ FILE *infile;
+
+ infile = fopen(input, "rb");
+ if (!infile) {
+ pr_err("lzma: fopen failed on %s: '%s'\n",
+ input, strerror(errno));
+ return -1;
+ }
+
+ ret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
+ if (ret != LZMA_OK) {
+ pr_err("lzma: lzma_stream_decoder failed %s (%d)\n",
+ lzma_strerror(ret), ret);
+ return -1;
+ }
+
+ strm.next_in = NULL;
+ strm.avail_in = 0;
+ strm.next_out = buf_out;
+ strm.avail_out = sizeof(buf_out);
+
+ while (1) {
+ if (strm.avail_in == 0 && !feof(infile)) {
+ strm.next_in = buf_in;
+ strm.avail_in = fread(buf_in, 1, sizeof(buf_in), infile);
+
+ if (ferror(infile)) {
+ pr_err("lzma: read error: %s\n", strerror(errno));
+ return -1;
+ }
+
+ if (feof(infile))
+ action = LZMA_FINISH;
+ }
+
+ ret = lzma_code(&strm, action);
+
+ if (strm.avail_out == 0 || ret == LZMA_STREAM_END) {
+ ssize_t write_size = sizeof(buf_out) - strm.avail_out;
+
+ if (writen(output_fd, buf_out, write_size) != write_size) {
+ pr_err("lzma: write error: %s\n", strerror(errno));
+ return -1;
+ }
+
+ strm.next_out = buf_out;
+ strm.avail_out = sizeof(buf_out);
+ }
+
+ if (ret != LZMA_OK) {
+ if (ret == LZMA_STREAM_END)
+ return 0;
+
+ pr_err("lzma: failed %s\n", lzma_strerror(ret));
+ return -1;
+ }
+ }
+
+ fclose(infile);
+ return 0;
+}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index fbd598afc606..1ff23e04ad27 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -329,4 +329,8 @@ bool find_process(const char *name);
int gzip_decompress_to_file(const char *input, int output_fd);
#endif
+#ifdef HAVE_LZMA_SUPPORT
+int lzma_decompress_to_file(const char *input, int output_fd);
+#endif
+
#endif /* GIT_COMPAT_UTIL_H */
--
1.9.3
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