Hi Athira,
+/* Function to return the extended register values */
+static u64 get_ext_regs_value(int idx)
+{
+ switch (idx) {
+ case PERF_REG_POWERPC_MMCR0:
+ return mfspr(SPRN_MMCR0);
+ case PERF_REG_POWERPC_MMCR1:
+ return mfspr(SPRN_MMCR1);
+ case PERF_REG_POWERPC_MMCR2:
+ return mfspr(SPRN_MMCR2);
+ default: return 0;
+ }
+}
+
u64 perf_reg_value(struct pt_regs *regs, int idx)
{
- if (WARN_ON_ONCE(idx >= PERF_REG_POWERPC_MAX))
- return 0;
+ u64 perf_reg_extended_max = 0;
This should be initialized to PERF_REG_POWERPC_MAX. Default to 0 will always
trigger below WARN_ON_ONCE(idx >= perf_reg_extended_max) on non p9/p10 systems.
+
+ if (cpu_has_feature(CPU_FTR_ARCH_300))
+ perf_reg_extended_max = PERF_REG_MAX_ISA_300;
if (idx == PERF_REG_POWERPC_SIER &&
(IS_ENABLED(CONFIG_FSL_EMB_PERF_EVENT) ||
@@ -85,6 +103,16 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
IS_ENABLED(CONFIG_PPC32)))
return 0;
+ if (idx >= PERF_REG_POWERPC_MAX && idx < perf_reg_extended_max)
+ return get_ext_regs_value(idx);
+
+ /*
+ * If the idx is referring to value beyond the
+ * supported registers, return 0 with a warning
+ */
+ if (WARN_ON_ONCE(idx >= perf_reg_extended_max))
+ return 0;
+
return regs_get_register(regs, pt_regs_offset[idx]);
}
Ravi
