Commit 610cb23b authored by Helge Deller's avatar Helge Deller
Browse files

parisc: Add initial kernel-side perf_event support 



Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent 912b9fd7

arch/parisc/Kconfig

+3 −0
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@@ -31,6 +31,9 @@ config PARISC 
	select HAVE_KERNEL_UNCOMPRESSED

	select HAVE_PCI

	select HAVE_PERF_EVENTS

	select HAVE_PERF_REGS

	select HAVE_PERF_USER_STACK_DUMP

	select PERF_USE_VMALLOC

	select HAVE_KERNEL_BZIP2

	select HAVE_KERNEL_GZIP

	select HAVE_KERNEL_LZ4

arch/parisc/include/asm/perf_event.h

+7 −1
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#ifndef __ASM_PARISC_PERF_EVENT_H

#define __ASM_PARISC_PERF_EVENT_H



/* Empty, just to avoid compiling error */

#include <asm/psw.h>



#define perf_arch_fetch_caller_regs(regs, __ip) { \

	(regs)->gr[0] = KERNEL_PSW; \

	(regs)->iaoq[0] = (__ip); \

	asm volatile("copy %%sp, %0\n":"=r"((regs)->gr[30])); \

}



#endif /* __ASM_PARISC_PERF_EVENT_H */

arch/parisc/include/uapi/asm/perf_regs.h

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+63 −0
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

#ifndef _UAPI_ASM_PARISC_PERF_REGS_H

#define _UAPI_ASM_PARISC_PERF_REGS_H



/* see struct user_regs_struct */

enum perf_event_parisc_regs {

	PERF_REG_PARISC_R0,	/* PSW is in gr[0] */

	PERF_REG_PARISC_R1,

	PERF_REG_PARISC_R2,

	PERF_REG_PARISC_R3,

	PERF_REG_PARISC_R4,

	PERF_REG_PARISC_R5,

	PERF_REG_PARISC_R6,

	PERF_REG_PARISC_R7,

	PERF_REG_PARISC_R8,

	PERF_REG_PARISC_R9,

	PERF_REG_PARISC_R10,

	PERF_REG_PARISC_R11,

	PERF_REG_PARISC_R12,

	PERF_REG_PARISC_R13,

	PERF_REG_PARISC_R14,

	PERF_REG_PARISC_R15,

	PERF_REG_PARISC_R16,

	PERF_REG_PARISC_R17,

	PERF_REG_PARISC_R18,

	PERF_REG_PARISC_R19,

	PERF_REG_PARISC_R20,

	PERF_REG_PARISC_R21,

	PERF_REG_PARISC_R22,

	PERF_REG_PARISC_R23,

	PERF_REG_PARISC_R24,

	PERF_REG_PARISC_R25,

	PERF_REG_PARISC_R26,

	PERF_REG_PARISC_R27,

	PERF_REG_PARISC_R28,

	PERF_REG_PARISC_R29,

	PERF_REG_PARISC_R30,

	PERF_REG_PARISC_R31,



	PERF_REG_PARISC_SR0,

	PERF_REG_PARISC_SR1,

	PERF_REG_PARISC_SR2,

	PERF_REG_PARISC_SR3,

	PERF_REG_PARISC_SR4,

	PERF_REG_PARISC_SR5,

	PERF_REG_PARISC_SR6,

	PERF_REG_PARISC_SR7,



	PERF_REG_PARISC_IAOQ0,

	PERF_REG_PARISC_IAOQ1,

	PERF_REG_PARISC_IASQ0,

	PERF_REG_PARISC_IASQ1,



	PERF_REG_PARISC_SAR,	/* CR11 */

	PERF_REG_PARISC_IIR,	/* CR19 */

	PERF_REG_PARISC_ISR,	/* CR20 */

	PERF_REG_PARISC_IOR,	/* CR21 */

	PERF_REG_PARISC_IPSW,	/* CR22 */



	PERF_REG_PARISC_MAX

};



#endif /* _UAPI_ASM_PARISC_PERF_REGS_H */

arch/parisc/kernel/Makefile

+1 −0
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@@ -38,6 +38,7 @@ obj-$(CONFIG_GENERIC_ARCH_TOPOLOGY) += topology.o 
obj-$(CONFIG_FUNCTION_TRACER)		+= ftrace.o

obj-$(CONFIG_FUNCTION_GRAPH_TRACER)	+= ftrace.o

obj-$(CONFIG_JUMP_LABEL)		+= jump_label.o

obj-$(CONFIG_PERF_EVENTS)		+= perf_event.o perf_regs.o

obj-$(CONFIG_KGDB)			+= kgdb.o

obj-$(CONFIG_KPROBES)			+= kprobes.o

obj-$(CONFIG_KEXEC_CORE)		+= kexec.o relocate_kernel.o

arch/parisc/kernel/perf_event.c

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// SPDX-License-Identifier: GPL-2.0

/*

 * Performance event support for parisc

 *

 * Copyright (C) 2025 by Helge Deller <deller@gmx.de>

 */



#include <linux/kernel.h>

#include <linux/perf_event.h>

#include <asm/unwind.h>



void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,

			   struct pt_regs *regs)

{



	struct unwind_frame_info info;



	unwind_frame_init_task(&info, current, NULL);

	while (1) {

		if (unwind_once(&info) < 0 || info.ip == 0)

			break;



		if (!__kernel_text_address(info.ip) ||

			perf_callchain_store(entry, info.ip))

				return;

	}

}