[PATCH V2 02/35] testing/selftests/powerpc: Add support to fetch "platform" and "base platform" from auxv to detect platform.

[Athira Rajeev]

The /proc/self/auxv contains information about "platform" on any
system. Also "base platform" which is an indication about platform
string corresponding to the real PVR. When systems are booted in
compat mode, say, power10 booted in power9 mode, "platform" will
point to power9 whereas base platform will point to power10. Incase,
if the distro doesn't support platform indicated by real PVR,
base platform will have a default value.
The mismatch of platform/base platform is an indication of system
booted in compat mode. In such cases, distro will have a Generic
Compat registered which supports basic features for performance
monitoring.

Some of the selftest needs to be handled differently ( ex: generic
events, alternative events, bhrb filter map) in Generic Compat PMU.
Hence selftest framework needs utility functions to identify such
cases. One way is make sure of auxv information. Below condition can
be used to detect if Generic Compat PMU is registered. ie:

<<>>
if ((AT_PLATFORM != AT_BASE_PLATFORM) && (AT_BASE_PLATFORM != PVR))
<<>>
this indicates Generic Compat PMU.

Add utility function in "include/utils.h" to return:
AT_PLATFORM and AT_BASE_PLATFORM from auxv. Also update misc.c in
"sampling_tests" folder to add function to use above check to
determine presence of generic compat pmu.

In other architecture ( like x86 ), pmu_name is exposed via
"/sys/bus/event_source/devices/cpu/caps". The same could be used
in powerpc in future. Since currently we don't have the "caps"
support in powerpc, patch uses auxv information to detect platform
type and compat mode. But as placeholder utility function is added
considering possiblity of getting "caps" information via sysfs.
If that doesn't exist, fallback to using auxv information.

Signed-off-by: Athira Rajeev <atrajeev at linux.vnet.ibm.com>
---
 .../testing/selftests/powerpc/include/utils.h | 10 ++++
 .../powerpc/pmu/sampling_tests/misc.c         | 50 +++++++++++++++++++
 .../powerpc/pmu/sampling_tests/misc.h         |  3 ++
 3 files changed, 63 insertions(+)

diff --git a/tools/testing/selftests/powerpc/include/utils.h b/tools/testing/selftests/powerpc/include/utils.h
index b9fa9cd709df..e222a5858450 100644
--- a/tools/testing/selftests/powerpc/include/utils.h
+++ b/tools/testing/selftests/powerpc/include/utils.h
@@ -74,6 +74,16 @@ static inline bool have_hwcap2(unsigned long ftr2)
 }
 #endif
 
+static inline char *auxv_base_platform(void)
+{
+	return ((char *)get_auxv_entry(AT_BASE_PLATFORM));
+}
+
+static inline char *auxv_platform(void)
+{
+	return ((char *)get_auxv_entry(AT_PLATFORM));
+}
+
 bool is_ppc64le(void);
 int using_hash_mmu(bool *using_hash);
 
diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c
index b984d1e162ac..f2baaeaea116 100644
--- a/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c
+++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c
@@ -454,3 +454,53 @@ int get_thresh_cmp_val(struct event event)
 		result = (exp << 8) | value;
 	return result;
 }
+
+/*
+ * Utility function to check for generic compat PMU
+ * by comparing base_platform value from auxv and real
+ * PVR value.
+ */
+static bool auxv_generic_compat_pmu(void)
+{
+	int base_pvr = 0;
+
+	if (!strcmp(auxv_base_platform(), "power9"))
+		base_pvr = POWER9;
+	else if (!strcmp(auxv_base_platform(), "power10"))
+		base_pvr = POWER10;
+
+	return (!base_pvr);
+}
+
+/*
+ * Check for generic compat PMU.
+ * First check for presence of pmu_name from
+ * "/sys/bus/event_source/devices/cpu/caps".
+ * If doesn't exist, fallback to using value
+ * auxv.
+ */
+bool check_for_generic_compat_pmu(void)
+{
+	char pmu_name[256];
+
+	memset(pmu_name, 0, sizeof(pmu_name));
+	if (read_sysfs_file("bus/event_source/devices/cpu/caps/pmu_name",
+		pmu_name, sizeof(pmu_name)) < 0)
+		return auxv_generic_compat_pmu();
+
+	if (!strcmp(pmu_name, "GENERIC_COMPAT"))
+		return true;
+	else
+		return false;
+}
+
+/*
+ * Check if system is booted in compat mode.
+ */
+bool check_for_compat_mode(void)
+{
+	char *platform = auxv_platform();
+	char *base_platform = auxv_base_platform();
+
+	return strcmp(platform, base_platform);
+}
diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.h b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.h
index 078120883fde..c0e923f38793 100644
--- a/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.h
+++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.h
@@ -5,6 +5,7 @@
  * Copyright 2022, Kajol Jain, IBM Corp.
  */
 
+#include <sys/stat.h>
 #include "../event.h"
 
 #define POWER10 0x80
@@ -53,6 +54,8 @@ int collect_samples(void *sample_buff);
 u64 *get_intr_regs(struct event *event, void *sample_buff);
 u64 get_reg_value(u64 *intr_regs, char *register_name);
 int get_thresh_cmp_val(struct event event);
+bool check_for_generic_compat_pmu(void);
+bool check_for_compat_mode(void);
 
 static inline int get_mmcr0_fc56(u64 mmcr0, int pmc)
 {
-- 
2.35.1