Re: [PATCH 3/4] kvx: add D-cache inval and I-cache sync

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

On 6/23/20 9:35 PM, Clement Leger wrote:
> Before booting, we must make sure the I-cache is synchronized with the
> D-cache to execute loaded instructions. In order to do that, add a
> function which execute a fence to ensure every memory accesses have
> been committed out of processor pipeline to memory and then invalidate
> I-cache to reload from memory. Moreover add a D-cache invalidation
> routine to cleanup cache before booting.
> 
> Signed-off-by: Clement Leger <cleger@kalray.eu>
> ---
>  arch/kvx/include/asm/cache.h | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>  create mode 100644 arch/kvx/include/asm/cache.h
> 
> diff --git a/arch/kvx/include/asm/cache.h b/arch/kvx/include/asm/cache.h
> new file mode 100644
> index 000000000..efda37ebd
> --- /dev/null
> +++ b/arch/kvx/include/asm/cache.h
> @@ -0,0 +1,24 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (C) 2019 Kalray Inc.
> + */
> +
> +#ifndef __KVX_CACHE_H
> +#define __KVX_CACHE_H
> +
> +#include <linux/types.h>
> +
> +static inline void sync_dcache_icache(void)
> +{
> +	__builtin_kvx_fence();
> +	__builtin_kvx_iinval();
> +	__builtin_kvx_barrier();
> +}

ARCH=arm calls this sync_caches_for_execution. Using the same name
sounds like a good idea IMHO.

> +
> +static inline void dcache_inval(void)
> +{
> +	__builtin_kvx_fence();
> +	__builtin_kvx_dinval();
> +}
> +
> +#endif /* __KVX_CACHE_H */
> 

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