perf/arm: Move 32-bit PMU drivers to drivers/perf/

It is preferred to put drivers under drivers/ rather than under arch/.
The PMU drivers also depend on arm_pmu.c, so it's better to place them
all together.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240626-arm-pmu-3-9-icntr-v2-3-c9784b4f4065@kernel.orgSigned-off-by: Will Deacon <will@kernel.org>

arch/arm/kernel/Makefile

@@ -78,8 +78,6 @@ obj-$(CONFIG_CPU_XSC3)		+= xscale-cp0.o
 obj-$(CONFIG_CPU_MOHAWK)	+= xscale-cp0.o
 obj-$(CONFIG_IWMMXT)		+= iwmmxt.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_regs.o perf_callchain.o
-obj-$(CONFIG_HW_PERF_EVENTS)	+= perf_event_xscale.o perf_event_v6.o \
-				   perf_event_v7.o
 AFLAGS_iwmmxt.o			:= -Wa,-mcpu=iwmmxt
 obj-$(CONFIG_ARM_CPU_TOPOLOGY)  += topology.o
 obj-$(CONFIG_VDSO)		+= vdso.o

drivers/perf/Kconfig

@@ -56,6 +56,18 @@ config ARM_PMU
 	  Say y if you want to use CPU performance monitors on ARM-based
 	  systems.
 
+config ARM_V6_PMU
+	depends on ARM_PMU && (CPU_V6 || CPU_V6K)
+	def_bool y
+
+config ARM_V7_PMU
+	depends on ARM_PMU && CPU_V7
+	def_bool y
+
+config ARM_XSCALE_PMU
+	depends on ARM_PMU && CPU_XSCALE
+	def_bool y
+
 config RISCV_PMU
 	depends on RISCV
 	bool "RISC-V PMU framework"

drivers/perf/Makefile

@@ -6,6 +6,9 @@ obj-$(CONFIG_ARM_DSU_PMU) += arm_dsu_pmu.o
 obj-$(CONFIG_ARM_PMU) += arm_pmu.o arm_pmu_platform.o
 obj-$(CONFIG_ARM_PMU_ACPI) += arm_pmu_acpi.o
 obj-$(CONFIG_ARM_PMUV3) += arm_pmuv3.o
+obj-$(CONFIG_ARM_V6_PMU) += arm_v6_pmu.o
+obj-$(CONFIG_ARM_V7_PMU) += arm_v7_pmu.o
+obj-$(CONFIG_ARM_XSCALE_PMU) += arm_xscale_pmu.o
 obj-$(CONFIG_ARM_SMMU_V3_PMU) += arm_smmuv3_pmu.o
 obj-$(CONFIG_FSL_IMX8_DDR_PMU) += fsl_imx8_ddr_perf.o
 obj-$(CONFIG_FSL_IMX9_DDR_PMU) += fsl_imx9_ddr_perf.o

arch/arm/kernel/perf_event_v6.c → drivers/perf/arm_v6_pmu.c

@@ -31,8 +31,6 @@
  * enable the interrupt.
  */
 
-#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K)
-
 #include <asm/cputype.h>
 #include <asm/irq_regs.h>
 
@@ -445,4 +443,3 @@ static struct platform_driver armv6_pmu_driver = {
 };
 
 builtin_platform_driver(armv6_pmu_driver);
-#endif	/* CONFIG_CPU_V6 || CONFIG_CPU_V6K */

arch/arm/kernel/perf_event_v7.c → drivers/perf/arm_v7_pmu.c

@@ -17,8 +17,6 @@
  *  counter and all 4 performance counters together can be reset separately.
  */
 
-#ifdef CONFIG_CPU_V7
-
 #include <asm/cp15.h>
 #include <asm/cputype.h>
 #include <asm/irq_regs.h>
@@ -2002,4 +2000,3 @@ static struct platform_driver armv7_pmu_driver = {
 };
 
 builtin_platform_driver(armv7_pmu_driver);
-#endif	/* CONFIG_CPU_V7 */

arch/arm/kernel/perf_event_xscale.c → drivers/perf/arm_xscale_pmu.c

@@ -13,8 +13,6 @@
  * PMU structures.
  */
 
-#ifdef CONFIG_CPU_XSCALE
-
 #include <asm/cputype.h>
 #include <asm/irq_regs.h>
 
@@ -745,4 +743,3 @@ static struct platform_driver xscale_pmu_driver = {
 };
 
 builtin_platform_driver(xscale_pmu_driver);
-#endif	/* CONFIG_CPU_XSCALE */