linux-kernel - Re: [PATCH v2 1/3] soc: Support for NPS HW scheduling

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Date:   Mon, 31 Oct 2016 11:26:59 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Noam Camus <noamca@...lanox.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, tglx@...utronix.de,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] soc: Support for NPS HW scheduling

On Sun, Oct 23, 2016 at 03:12:26PM +0300, Noam Camus wrote:
> From: Noam Camus <noamca@...lanox.com>
> 
> This new header file is for NPS400 SoC (part of ARC architecture).
> The header file includes macros for save/restore of HW scheduling.
> The control of HW scheduling is acheived by writing core registers.

s/acheived/achieved/

> This code was moved from arc/plat-eznps so it can be used
> from drivers/clocksource/, available only for CONFIG_EZNPS_MTM_EXT.
> 
> Signed-off-by: Noam Camus <noamca@...lanox.com>
> ---
>  arch/arc/plat-eznps/include/plat/ctop.h |    2 -
>  include/soc/nps/mtm.h                   |   59 +++++++++++++++++++++++++++++++
>  2 files changed, 59 insertions(+), 2 deletions(-)
>  create mode 100644 include/soc/nps/mtm.h
> 
> diff --git a/arch/arc/plat-eznps/include/plat/ctop.h b/arch/arc/plat-eznps/include/plat/ctop.h
> index 9d6718c..ee2e32d 100644
> --- a/arch/arc/plat-eznps/include/plat/ctop.h
> +++ b/arch/arc/plat-eznps/include/plat/ctop.h
> @@ -46,9 +46,7 @@
>  #define CTOP_AUX_UDMC				(CTOP_AUX_BASE + 0x300)
>  
>  /* EZchip core instructions */
> -#define CTOP_INST_HWSCHD_OFF_R3			0x3B6F00BF
>  #define CTOP_INST_HWSCHD_OFF_R4			0x3C6F00BF
> -#define CTOP_INST_HWSCHD_RESTORE_R3		0x3E6F70C3
>  #define CTOP_INST_HWSCHD_RESTORE_R4		0x3E6F7103
>  #define CTOP_INST_SCHD_RW			0x3E6F7004
>  #define CTOP_INST_SCHD_RD			0x3E6F7084
> diff --git a/include/soc/nps/mtm.h b/include/soc/nps/mtm.h
> new file mode 100644
> index 0000000..d2f5e7e
> --- /dev/null
> +++ b/include/soc/nps/mtm.h
> @@ -0,0 +1,59 @@
> +/*
> + * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
> + *
> + * This software is available to you under a choice of one of two
> + * licenses.  You may choose to be licensed under the terms of the GNU
> + * General Public License (GPL) Version 2, available from the file
> + * COPYING in the main directory of this source tree, or the
> + * OpenIB.org BSD license below:
> + *
> + *     Redistribution and use in source and binary forms, with or
> + *     without modification, are permitted provided that the following
> + *     conditions are met:
> + *
> + *      - Redistributions of source code must retain the above
> + *        copyright notice, this list of conditions and the following
> + *        disclaimer.
> + *
> + *      - Redistributions in binary form must reproduce the above
> + *        copyright notice, this list of conditions and the following
> + *        disclaimer in the documentation and/or other materials
> + *        provided with the distribution.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
> + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
> + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
> + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
> + * SOFTWARE.
> + */
> +
> +#ifndef SOC_NPS_MTM_H
> +#define SOC_NPS_MTM_H
> +
> +#define CTOP_INST_HWSCHD_OFF_R3                 0x3B6F00BF
> +#define CTOP_INST_HWSCHD_RESTORE_R3             0x3E6F70C3
> +
> +static inline void hw_schd_save(unsigned int *flags)
> +{
> +	__asm__ __volatile__(
> +	"       .word %1\n"
> +	"       st r3,[%0]\n"
> +	:
> +	: "r"(flags), "i"(CTOP_INST_HWSCHD_OFF_R3)
> +	: "r3", "memory");
> +}
> +

Wouldn't make sense to change the macro name to CTOP_INST_HWSCHD_SAVE_R3 ?

> +static inline void hw_schd_restore(unsigned int flags)
> +{
> +	__asm__ __volatile__(
> +	"       mov r3, %0\n"
> +	"       .word %1\n"
> +	:
> +	: "r"(flags), "i"(CTOP_INST_HWSCHD_RESTORE_R3)
> +	: "r3");
> +}
> +
> +#endif /* SOC_NPS_MTM_H */
> -- 
> 1.7.1
>