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Commit 92779245 authored by Haren Myneni's avatar Haren Myneni Committed by Benjamin Herrenschmidt
Browse files

powerpc: Define ppr in thread_struct 



[PATCH 4/6] powerpc: Define ppr in thread_struct

ppr in thread_struct is used to save PPR and restore it before process exits
from kernel.

This patch sets the default priority to 3 when tasks are created such
that users can use 4 for higher priority tasks.

Signed-off-by: default avatarHaren Myneni <haren@us.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent a09688cd

arch/powerpc/include/asm/processor.h

+12 −0
Original line number Diff line number Diff line
@@ -18,6 +18,16 @@ 
#define TS_FPRWIDTH 1

#endif



#ifdef CONFIG_PPC64

/* Default SMT priority is set to 3. Use 11- 13bits to save priority. */

#define PPR_PRIORITY 3

#ifdef __ASSEMBLY__

#define INIT_PPR (PPR_PRIORITY << 50)

#else

#define INIT_PPR ((u64)PPR_PRIORITY << 50)

#endif /* __ASSEMBLY__ */

#endif /* CONFIG_PPC64 */



#ifndef __ASSEMBLY__

#include <linux/compiler.h>

#include <linux/cache.h>
@@ -245,6 +255,7 @@ struct thread_struct { 
#ifdef CONFIG_PPC64

	unsigned long	dscr;

	int		dscr_inherit;

	unsigned long	ppr;	/* used to save/restore SMT priority */

#endif

};
@@ -278,6 +289,7 @@ struct thread_struct { 
	.fpr = {{0}}, \

	.fpscr = { .val = 0, }, \

	.fpexc_mode = 0, \

	.ppr = INIT_PPR, \

}

#endif

arch/powerpc/kernel/asm-offsets.c

+1 −0
Original line number Diff line number Diff line
@@ -77,6 +77,7 @@ int main(void) 
	DEFINE(NMI_MASK, NMI_MASK);

	DEFINE(THREAD_DSCR, offsetof(struct thread_struct, dscr));

	DEFINE(THREAD_DSCR_INHERIT, offsetof(struct thread_struct, dscr_inherit));

	DEFINE(TASKTHREADPPR, offsetof(struct task_struct, thread.ppr));

#else

	DEFINE(THREAD_INFO, offsetof(struct task_struct, stack));

#endif /* CONFIG_PPC64 */

arch/powerpc/kernel/process.c

+2 −0
Original line number Diff line number Diff line
@@ -813,6 +813,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, 
		p->thread.dscr_inherit = current->thread.dscr_inherit;

		p->thread.dscr = current->thread.dscr;

	}

	if (cpu_has_feature(CPU_FTR_HAS_PPR))

		p->thread.ppr = INIT_PPR;

#endif

	/*

	 * The PPC64 ABI makes use of a TOC to contain function