ANDROID: topology: Add restricted vendor hook for cpu_capacity_show

Introduce a restricted vendor hook to allow vendor modules to update
cpu_capacity shown via userspace.

Bug: 335410902
Change-Id: I5a196c8cffdfb6835e75b60d983cd30541a9756e
Signed-off-by: Shaleen Agrawal <quic_shalagra@quicinc.com>
(cherry picked from commit 333328523be5556b7fa0bfe045da466936ff8b81)

drivers/android/vendor_hooks.c

@@ -122,3 +122,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_look_around_migrate_folio);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_test_clear_look_around_ref);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_arm64_serror_panic);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_do_sea);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_cpu_capacity_show);

drivers/base/arch_topology.c

@@ -220,8 +220,10 @@ static ssize_t cpu_capacity_show(struct device *dev,
 				 char *buf)
 {
 	struct cpu *cpu = container_of(dev, struct cpu, dev);
+	unsigned long capacity = topology_get_cpu_scale(cpu->dev.id);
 
-	return sysfs_emit(buf, "%lu\n", topology_get_cpu_scale(cpu->dev.id));
+	trace_android_rvh_cpu_capacity_show(&capacity, cpu->dev.id);
+	return sysfs_emit(buf, "%lu\n", capacity);
 }
 
 static void update_topology_flags_workfn(struct work_struct *work);

include/trace/hooks/topology.h

@@ -16,6 +16,10 @@ DECLARE_HOOK(android_vh_arch_set_freq_scale,
 		unsigned long *scale),
 	TP_ARGS(cpus, freq, max, scale));
 
+DECLARE_RESTRICTED_HOOK(android_rvh_cpu_capacity_show,
+	TP_PROTO(unsigned long *capacity, int cpu),
+	TP_ARGS(capacity, cpu), 1);
+
 #endif /* _TRACE_HOOK_TOPOLOGY_H */
 /* This part must be outside protection */
 #include <trace/define_trace.h>