perf tools: Fix endianity swapping for adds_features bitmask

Based on Jiri's latest attempt:
https://lkml.org/lkml/2012/5/16/61

Basically, adds_features should be byte swapped assuming unsigned
longs are either 8-bytes (u64) or 4-bytes (u32).

    Fixes 32-bit ppc dumping 64-bit x86 feature data:
     ========
     captured on: Sun May 20 19:23:23 2012
     hostname : nxos-vdc-dev3
     os release : 3.4.0-rc7+
     perf version : 3.4.rc4.137.g978da3
     arch : x86_64
     nrcpus online : 16
     nrcpus avail : 16
     cpudesc : Intel(R) Xeon(R) CPU E5540 @ 2.53GHz
     cpuid : GenuineIntel,6,26,5
     total memory : 24680324 kB
    ...

Verified 64-bit x86 can still dump feature data for 32-bit ppc.

Signed-off-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/4FBBB539.5010805@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 2dd5edf..4f9b247 100644 (file)
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1942,7 +1942,6 @@ int perf_file_header__read(struct perf_file_header *header,
                else
                        return -1;
        } else if (ph->needs_swap) {
-               unsigned int i;
                /*
                 * feature bitmap is declared as an array of unsigned longs --
                 * not good since its size can differ between the host that
@@ -1958,14 +1957,17 @@ int perf_file_header__read(struct perf_file_header *header,
                 * file), punt and fallback to the original behavior --
                 * clearing all feature bits and setting buildid.
                 */
-               for (i = 0; i < BITS_TO_LONGS(HEADER_FEAT_BITS); ++i)
-                       header->adds_features[i] = bswap_64(header->adds_features[i]);
+               mem_bswap_64(&header->adds_features,
+                           BITS_TO_U64(HEADER_FEAT_BITS));
 
                if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
-                       for (i = 0; i < BITS_TO_LONGS(HEADER_FEAT_BITS); ++i) {
-                               header->adds_features[i] = bswap_64(header->adds_features[i]);
-                               header->adds_features[i] = bswap_32(header->adds_features[i]);
-                       }
+                       /* unswap as u64 */
+                       mem_bswap_64(&header->adds_features,
+                                   BITS_TO_U64(HEADER_FEAT_BITS));
+
+                       /* unswap as u32 */
+                       mem_bswap_32(&header->adds_features,
+                                   BITS_TO_U32(HEADER_FEAT_BITS));
                }
 
                if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {

diff --git a/tools/perf/util/include/linux/bitops.h b/tools/perf/util/include/linux/bitops.h
index f158483..587a230 100644 (file)
--- a/tools/perf/util/include/linux/bitops.h
+++ b/tools/perf/util/include/linux/bitops.h
@@ -8,6 +8,8 @@
 #define BITS_PER_LONG __WORDSIZE
 #define BITS_PER_BYTE           8
 #define BITS_TO_LONGS(nr)       DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
+#define BITS_TO_U64(nr)         DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u64))
+#define BITS_TO_U32(nr)         DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u32))
 
 #define for_each_set_bit(bit, addr, size) \
        for ((bit) = find_first_bit((addr), (size));            \

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 2600916..c3e399b 100644 (file)
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -442,6 +442,16 @@ static void perf_tool__fill_defaults(struct perf_tool *tool)
                        tool->finished_round = process_finished_round_stub;
        }
 }
+ 
+void mem_bswap_32(void *src, int byte_size)
+{
+       u32 *m = src;
+       while (byte_size > 0) {
+               *m = bswap_32(*m);
+               byte_size -= sizeof(u32);
+               ++m;
+       }
+}
 
 void mem_bswap_64(void *src, int byte_size)
 {

diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 7a5434c..0c702e3 100644 (file)
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -80,6 +80,7 @@ struct branch_info *machine__resolve_bstack(struct machine *self,
 bool perf_session__has_traces(struct perf_session *self, const char *msg);
 
 void mem_bswap_64(void *src, int byte_size);
+void mem_bswap_32(void *src, int byte_size);
 void perf_event__attr_swap(struct perf_event_attr *attr);
 
 int perf_session__create_kernel_maps(struct perf_session *self);