csky: Add perf support for C-SKY

This adds basic perf support for all C-SKY CPUs. Hardware events are
only supported by 807/810/860.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>

arch/csky/Kconfig

@@ -35,6 +35,7 @@ config CSKY
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_LZO
 	select HAVE_KERNEL_LZMA
+	select HAVE_PERF_EVENTS
 	select HAVE_C_RECORDMCOUNT
 	select HAVE_DMA_API_DEBUG
 	select HAVE_DMA_CONTIGUOUS
@@ -43,7 +44,7 @@ config CSKY
 	select OF
 	select OF_EARLY_FLATTREE
 	select OF_RESERVED_MEM
-	select PERF_USE_VMALLOC
+	select PERF_USE_VMALLOC if CPU_CK610
 	select RTC_LIB
 	select TIMER_OF
 	select USB_ARCH_HAS_EHCI
@@ -150,6 +151,19 @@ config CPU_CK860
 	select CPU_HAS_FPUV2
 endchoice
 
+choice
+	prompt "C-SKY PMU type"
+	depends on PERF_EVENTS
+	depends on CPU_CK807 || CPU_CK810 || CPU_CK860
+
+config CPU_PMU_NONE
+	bool "None"
+
+config CSKY_PMU_V1
+	bool "Performance Monitoring Unit Ver.1"
+
+endchoice
+
 choice
 	prompt "Power Manager Instruction (wait/doze/stop)"
 	default CPU_PM_NONE

arch/csky/include/asm/perf_event.h

@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#ifndef __ASM_CSKY_PERF_EVENT_H
+#define __ASM_CSKY_PERF_EVENT_H
+
+#endif /* __ASM_PERF_EVENT_ELF_H */

arch/csky/kernel/Makefile

@@ -8,6 +8,7 @@ obj-$(CONFIG_MODULES)			+= module.o
 obj-$(CONFIG_SMP)			+= smp.o
 obj-$(CONFIG_FUNCTION_TRACER)		+= ftrace.o
 obj-$(CONFIG_STACKTRACE)		+= stacktrace.o
+obj-$(CONFIG_CSKY_PMU_V1)		+= perf_event.o
 
 ifdef CONFIG_FUNCTION_TRACER
 CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)