Commit e13e3059 authored by Thomas Weißschuh's avatar Thomas Weißschuh Committed by Thomas Gleixner
Browse files

sparc64: vdso: Introduce vdso/processor.h 



The generic vDSO library expects a vdso/processor.h with an definition of
cpu_relax().

Split out cpu_relax() into this dedicated header.

Signed-off-by: default avatarThomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: default avatarThomas Gleixner <tglx@kernel.org>
Tested-by: default avatarAndreas Larsson <andreas@gaisler.com>
Reviewed-by: default avatarAndreas Larsson <andreas@gaisler.com>
Acked-by: default avatarAndreas Larsson <andreas@gaisler.com>
Link: https://patch.msgid.link/20260304-vdso-sparc64-generic-2-v6-9-d8eb3b0e1410@linutronix.de
parent d60c682b

arch/sparc/include/asm/processor.h

+3 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef ___ASM_SPARC_PROCESSOR_H

#define ___ASM_SPARC_PROCESSOR_H



#include <asm/vdso/processor.h>



#if defined(__sparc__) && defined(__arch64__)

#include <asm/processor_64.h>

#else

arch/sparc/include/asm/processor_32.h

+0 −2
Original line number Diff line number Diff line
@@ -91,8 +91,6 @@ unsigned long __get_wchan(struct task_struct *); 
extern struct task_struct *last_task_used_math;

int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);



#define cpu_relax()	barrier()



extern void (*sparc_idle)(void);



#endif

arch/sparc/include/asm/processor_64.h

+0 −25
Original line number Diff line number Diff line
@@ -182,31 +182,6 @@ unsigned long __get_wchan(struct task_struct *task); 
#define KSTK_EIP(tsk)  (task_pt_regs(tsk)->tpc)

#define KSTK_ESP(tsk)  (task_pt_regs(tsk)->u_regs[UREG_FP])



/* Please see the commentary in asm/backoff.h for a description of

 * what these instructions are doing and how they have been chosen.

 * To make a long story short, we are trying to yield the current cpu

 * strand during busy loops.

 */

#ifdef	BUILD_VDSO

#define	cpu_relax()	asm volatile("\n99:\n\t"			\

				     "rd	%%ccr, %%g0\n\t"	\

				     "rd	%%ccr, %%g0\n\t"	\

				     "rd	%%ccr, %%g0\n\t"	\

				     ::: "memory")

#else /* ! BUILD_VDSO */

#define cpu_relax()	asm volatile("\n99:\n\t"			\

				     "rd	%%ccr, %%g0\n\t"	\

				     "rd	%%ccr, %%g0\n\t"	\

				     "rd	%%ccr, %%g0\n\t"	\

				     ".section	.pause_3insn_patch,\"ax\"\n\t"\

				     ".word	99b\n\t"		\

				     "wr	%%g0, 128, %%asr27\n\t"	\

				     "nop\n\t"				\

				     "nop\n\t"				\

				     ".previous"			\

				     ::: "memory")

#endif



/* Prefetch support.  This is tuned for UltraSPARC-III and later.

 * UltraSPARC-I will treat these as nops, and UltraSPARC-II has

 * a shallower prefetch queue than later chips.

arch/sparc/include/asm/vdso/processor.h

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+41 −0
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/* SPDX-License-Identifier: GPL-2.0 */



#ifndef _ASM_SPARC_VDSO_PROCESSOR_H

#define _ASM_SPARC_VDSO_PROCESSOR_H



#include <linux/compiler.h>



#if defined(__arch64__)



/* Please see the commentary in asm/backoff.h for a description of

 * what these instructions are doing and how they have been chosen.

 * To make a long story short, we are trying to yield the current cpu

 * strand during busy loops.

 */

#ifdef	BUILD_VDSO

#define	cpu_relax()	asm volatile("\n99:\n\t"			\

				     "rd	%%ccr, %%g0\n\t"	\

				     "rd	%%ccr, %%g0\n\t"	\

				     "rd	%%ccr, %%g0\n\t"	\

				     ::: "memory")

#else /* ! BUILD_VDSO */

#define cpu_relax()	asm volatile("\n99:\n\t"			\

				     "rd	%%ccr, %%g0\n\t"	\

				     "rd	%%ccr, %%g0\n\t"	\

				     "rd	%%ccr, %%g0\n\t"	\

				     ".section	.pause_3insn_patch,\"ax\"\n\t"\

				     ".word	99b\n\t"		\

				     "wr	%%g0, 128, %%asr27\n\t"	\

				     "nop\n\t"				\

				     "nop\n\t"				\

				     ".previous"			\

				     ::: "memory")

#endif /* BUILD_VDSO */



#else /* ! __arch64__ */



#define cpu_relax()	barrier()



#endif /* __arch64__ */



#endif /* _ASM_SPARC_VDSO_PROCESSOR_H */