ANDROID: topology: Add vendor hook for use_amu_fie

Vendors could decide to use amu fie feature or not, such as if they
have some feature that needs amu fie to be disabled.

Bug: 261753861
Change-Id: I6b44ee899c58e7d5a8b2db03a30e3ab14b08f101
Signed-off-by: Rick Yiu <rickyiu@google.com>

arch/arm64/kernel/topology.c

@@ -22,6 +22,8 @@
 #include <asm/cputype.h>
 #include <asm/topology.h>
 
+#include <trace/hooks/topology.h>
+
 #ifdef CONFIG_ACPI
 static bool __init acpi_cpu_is_threaded(int cpu)
 {
@@ -163,6 +165,11 @@ static void amu_scale_freq_tick(void)
 {
 	u64 prev_core_cnt, prev_const_cnt;
 	u64 core_cnt, const_cnt, scale;
+	bool use_amu_fie = true;
+
+	trace_android_vh_use_amu_fie(&use_amu_fie);
+	if(!use_amu_fie)
+		return;
 
 	prev_const_cnt = this_cpu_read(arch_const_cycles_prev);
 	prev_core_cnt = this_cpu_read(arch_core_cycles_prev);

drivers/android/vendor_hooks.c

@@ -289,3 +289,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_do_madvise_blk_plug);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_shrink_inactive_list_blk_plug);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_shrink_lruvec_blk_plug);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_reclaim_pages_plug);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_use_amu_fie);

drivers/base/arch_topology.c

@@ -29,6 +29,12 @@ static bool scale_freq_invariant;
 
 static bool supports_scale_freq_counters(const struct cpumask *cpus)
 {
+	bool use_amu_fie = true;
+
+	trace_android_vh_use_amu_fie(&use_amu_fie);
+	if (!use_amu_fie)
+		return false;
+
 	return cpumask_subset(cpus, &scale_freq_counters_mask);
 }
 

include/trace/hooks/topology.h

@@ -20,6 +20,10 @@ DECLARE_HOOK(android_vh_update_topology_flags_workfn,
 	TP_PROTO(void *unused),
 	TP_ARGS(unused));
 
+DECLARE_HOOK(android_vh_use_amu_fie,
+	TP_PROTO(bool *use_amu_fie),
+	TP_ARGS(use_amu_fie));
+
 #endif /* _TRACE_HOOK_TOPOLOGY_H */
 /* This part must be outside protection */
 #include <trace/define_trace.h>