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Commit 37f2a174 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
Browse files

MIPS: Introduce API for enabling & disabling L2 prefetch 



Introduce new functions in struct bcache_ops to enable & disable L2
cache prefetching, and to retrieve the current state of L2 prefetching.
This will be used in later patches.

Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11179/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent c1a0e9bc

arch/mips/include/asm/bcache.h

+27 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
#ifndef _ASM_BCACHE_H

#define _ASM_BCACHE_H



#include <linux/types.h>



/* Some R4000 / R4400 / R4600 / R5000 machines may have a non-dma-coherent,

   chipset implemented caches.	On machines with other CPUs the CPU does the
@@ -18,6 +19,9 @@ struct bcache_ops { 
	void (*bc_disable)(void);

	void (*bc_wback_inv)(unsigned long page, unsigned long size);

	void (*bc_inv)(unsigned long page, unsigned long size);

	void (*bc_prefetch_enable)(void);

	void (*bc_prefetch_disable)(void);

	bool (*bc_prefetch_is_enabled)(void);

};



extern void indy_sc_init(void);
@@ -46,6 +50,26 @@ static inline void bc_inv(unsigned long page, unsigned long size) 
	bcops->bc_inv(page, size);

}



static inline void bc_prefetch_enable(void)

{

	if (bcops->bc_prefetch_enable)

		bcops->bc_prefetch_enable();

}



static inline void bc_prefetch_disable(void)

{

	if (bcops->bc_prefetch_disable)

		bcops->bc_prefetch_disable();

}



static inline bool bc_prefetch_is_enabled(void)

{

	if (bcops->bc_prefetch_is_enabled)

		return bcops->bc_prefetch_is_enabled();



	return false;

}



#else /* !defined(CONFIG_BOARD_SCACHE) */



/* Not R4000 / R4400 / R4600 / R5000.  */
@@ -54,6 +78,9 @@ static inline void bc_inv(unsigned long page, unsigned long size) 
#define bc_disable() do { } while (0)

#define bc_wback_inv(page, size) do { } while (0)

#define bc_inv(page, size) do { } while (0)

#define bc_prefetch_enable() do { } while (0)

#define bc_prefetch_disable() do { } while (0)

#define bc_prefetch_is_enabled() 0



#endif /* !defined(CONFIG_BOARD_SCACHE) */