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<pre>On 09/10/23 10:30 am, Athira Rajeev wrote:</pre>
<blockquote type="cite"
cite="mid:20231009050052.64935-1-atrajeev@linux.vnet.ibm.com">
<pre class="moz-quote-pre" wrap="">Simple expression parser test fails in powerpc as below:
4: Simple expression parser
test child forked, pid 170385
Using CPUID 004e2102
division by zero
syntax error
syntax error
FAILED tests/expr.c:65 parse test failed
test child finished with -1
Simple expression parser: FAILED!
This is observed after commit:
'commit 9d5da30e4ae9 ("perf jevents: Add a new expression builtin strcmp_cpuid_str()")'
With this commit, a new expression builtin strcmp_cpuid_str
got added. This function takes an 'ID' type value, which is
a string. So expression parse for strcmp_cpuid_str expects
const char * as cpuid value type. In case of powerpc, CPU IDs
are numbers. Hence it doesn't get interpreted correctly by
bison parser. Example in case of power9, cpuid string returns
as: 004e2102
cpuid of string type is expected in two cases:
1. char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused);
Testcase "tests/expr.c" uses "perf_pmu__getcpuid" which calls
get_cpuid_str to get the cpuid string.
2. cpuid field in :struct pmu_events_map
struct pmu_events_map {
const char *arch;
const char *cpuid;
Here cpuid field is used in "perf_pmu__find_events_table"
function as "strcmp_cpuid_str(map->cpuid, cpuid)". The
value for cpuid field is picked from mapfile.csv.
Fix the mapfile.csv and get_cpuid_str function to prefix
cpuid with 0x so that it gets correctly interpreted by
the bison parser
Signed-off-by: Athira Rajeev <a class="moz-txt-link-rfc2396E" href="mailto:atrajeev@linux.vnet.ibm.com"><atrajeev@linux.vnet.ibm.com></a></pre>
</blockquote>
<pre>Tested the patch on Power10 machine, now its correctly able to interpret cpuid
value and perf Simple expression parser test passed.
# ./perf test -v 7
7: Simple expression parser :
--- start ---
test child forked, pid 87922
Using CPUID 0x00800200
division by zero
syntax error
test child finished with 0
---- end ----
Simple expression parser: Ok
Tested-by: Disha Goel <a class="moz-txt-link-rfc2396E" href="mailto:disgoel@linux.ibm.com"><disgoel@linux.ibm.com></a>
</pre>
<blockquote type="cite"
cite="mid:20231009050052.64935-1-atrajeev@linux.vnet.ibm.com">
<pre class="moz-quote-pre" wrap="">
---
tools/perf/arch/powerpc/util/header.c | 2 +-
tools/perf/pmu-events/arch/powerpc/mapfile.csv | 6 +++---
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/tools/perf/arch/powerpc/util/header.c b/tools/perf/arch/powerpc/util/header.c
index c8d0dc775e5d..6b00efd53638 100644
--- a/tools/perf/arch/powerpc/util/header.c
+++ b/tools/perf/arch/powerpc/util/header.c
@@ -34,7 +34,7 @@ get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
{
char *bufp;
- if (asprintf(&bufp, "%.8lx", mfspr(SPRN_PVR)) < 0)
+ if (asprintf(&bufp, "0x%.8lx", mfspr(SPRN_PVR)) < 0)
bufp = NULL;
return bufp;
diff --git a/tools/perf/pmu-events/arch/powerpc/mapfile.csv b/tools/perf/pmu-events/arch/powerpc/mapfile.csv
index a534ff6db14b..f4908af7ad66 100644
--- a/tools/perf/pmu-events/arch/powerpc/mapfile.csv
+++ b/tools/perf/pmu-events/arch/powerpc/mapfile.csv
@@ -13,6 +13,6 @@
#
# Power8 entries
-004[bcd][[:xdigit:]]{4},1,power8,core
-004e[[:xdigit:]]{4},1,power9,core
-0080[[:xdigit:]]{4},1,power10,core
+0x004[bcd][[:xdigit:]]{4},1,power8,core
+0x004e[[:xdigit:]]{4},1,power9,core
+0x0080[[:xdigit:]]{4},1,power10,core
</pre>
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