powerpc/perf: Update perf_regs structure to include SIER

On each sample, Sample Instruction Event Register (SIER) content
is saved in pt_regs. SIER does not have a entry as-is in the pt_regs
but instead, SIER content is saved in the "dar" register of pt_regs.

Patch adds another entry to the perf_regs structure to include the "SIER"
printing which internally maps to the "dar" of pt_regs.

It also check for the SIER availability in the platform and present
value accordingly

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

7 files changed, 23 insertions, 1 deletions

diff --git a/arch/powerpc/include/asm/perf_event.h b/arch/powerpc/include/asm/perf_event.h
index 16a49819da9a..35926cd6cd0b 100644
--- a/arch/powerpc/include/asm/perf_event.h
+++ b/arch/powerpc/include/asm/perf_event.h
@@ -39,4 +39,7 @@
                 (regs)->gpr[1] = current_stack_pointer();       \
                 asm volatile("mfmsr %0" : "=r" ((regs)->msr));  \
         } while (0)
+
+/* To support perf_regs sier update */
+extern bool is_sier_available(void);
 #endif
diff --git a/arch/powerpc/include/uapi/asm/perf_regs.h b/arch/powerpc/include/uapi/asm/perf_regs.h
index 9e52c86ccbd3..ff91192407d1 100644
--- a/arch/powerpc/include/uapi/asm/perf_regs.h
+++ b/arch/powerpc/include/uapi/asm/perf_regs.h
@@ -46,6 +46,7 @@ enum perf_event_powerpc_regs {
         PERF_REG_POWERPC_TRAP,
         PERF_REG_POWERPC_DAR,
         PERF_REG_POWERPC_DSISR,
+        PERF_REG_POWERPC_SIER,
         PERF_REG_POWERPC_MAX,
 };
 #endif /* _UAPI_ASM_POWERPC_PERF_REGS_H */
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index 81f8a0c838ae..b4976cae1005 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -130,6 +130,14 @@ static inline void power_pmu_bhrb_read(struct cpu_hw_events *cpuhw) {}
 static void pmao_restore_workaround(bool ebb) { }
 #endif /* CONFIG_PPC32 */
 
+bool is_sier_available(void)
+{
+        if (ppmu->flags & PPMU_HAS_SIER)
+                return true;
+
+        return false;
+}
+
 static bool regs_use_siar(struct pt_regs *regs)
 {
         /*
diff --git a/arch/powerpc/perf/perf_regs.c b/arch/powerpc/perf/perf_regs.c
index 09ceea6175ba..5c36b3a8d47a 100644
--- a/arch/powerpc/perf/perf_regs.c
+++ b/arch/powerpc/perf/perf_regs.c
@@ -69,6 +69,7 @@ static unsigned int pt_regs_offset[PERF_REG_POWERPC_MAX] = {
         PT_REGS_OFFSET(PERF_REG_POWERPC_TRAP, trap),
         PT_REGS_OFFSET(PERF_REG_POWERPC_DAR, dar),
         PT_REGS_OFFSET(PERF_REG_POWERPC_DSISR, dsisr),
+        PT_REGS_OFFSET(PERF_REG_POWERPC_SIER, dar),
 };
 
 u64 perf_reg_value(struct pt_regs *regs, int idx)
@@ -76,6 +77,12 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
         if (WARN_ON_ONCE(idx >= PERF_REG_POWERPC_MAX))
                 return 0;
 
+        if (idx == PERF_REG_POWERPC_SIER &&
+           (IS_ENABLED(CONFIG_FSL_EMB_PERF_EVENT) ||
+            IS_ENABLED(CONFIG_PPC32) ||
+            !is_sier_available()))
+                return 0;
+
         return regs_get_register(regs, pt_regs_offset[idx]);
 }
 
diff --git a/tools/arch/powerpc/include/uapi/asm/perf_regs.h b/tools/arch/powerpc/include/uapi/asm/perf_regs.h
index 9e52c86ccbd3..ff91192407d1 100644
--- a/tools/arch/powerpc/include/uapi/asm/perf_regs.h
+++ b/tools/arch/powerpc/include/uapi/asm/perf_regs.h
@@ -46,6 +46,7 @@ enum perf_event_powerpc_regs {
         PERF_REG_POWERPC_TRAP,
         PERF_REG_POWERPC_DAR,
         PERF_REG_POWERPC_DSISR,
+        PERF_REG_POWERPC_SIER,
         PERF_REG_POWERPC_MAX,
 };
 #endif /* _UAPI_ASM_POWERPC_PERF_REGS_H */
diff --git a/tools/perf/arch/powerpc/include/perf_regs.h b/tools/perf/arch/powerpc/include/perf_regs.h
index 00e37b106913..1076393e6f43 100644
--- a/tools/perf/arch/powerpc/include/perf_regs.h
+++ b/tools/perf/arch/powerpc/include/perf_regs.h
@@ -62,7 +62,8 @@ static const char *reg_names[] = {
         [PERF_REG_POWERPC_SOFTE] = "softe",
         [PERF_REG_POWERPC_TRAP] = "trap",
         [PERF_REG_POWERPC_DAR] = "dar",
-        [PERF_REG_POWERPC_DSISR] = "dsisr"
+        [PERF_REG_POWERPC_DSISR] = "dsisr",
+        [PERF_REG_POWERPC_SIER] = "sier"
 };
 
 static inline const char *perf_reg_name(int id)
diff --git a/tools/perf/arch/powerpc/util/perf_regs.c b/tools/perf/arch/powerpc/util/perf_regs.c
index ec50939b0418..07fcd977d93e 100644
--- a/tools/perf/arch/powerpc/util/perf_regs.c
+++ b/tools/perf/arch/powerpc/util/perf_regs.c
@@ -52,6 +52,7 @@ const struct sample_reg sample_reg_masks[] = {
         SMPL_REG(trap, PERF_REG_POWERPC_TRAP),
         SMPL_REG(dar, PERF_REG_POWERPC_DAR),
         SMPL_REG(dsisr, PERF_REG_POWERPC_DSISR),
+        SMPL_REG(sier, PERF_REG_POWERPC_SIER),
         SMPL_REG_END
 };