linux-kernel - Re: [PATCH] MIPS: disable MMID if GINVT is not usable

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Message-Id: <808e21d2-1212-4358-9ba6-29f9d097be8a@app.fastmail.com>
Date: Wed, 25 Jun 2025 15:44:00 +0100
From: "Jiaxun Yang" <jiaxun.yang@...goat.com>
To: "Gregory CLEMENT" <gregory.clement@...tlin.com>,
 "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>
Cc: "Vladimir Kondratiev" <vladimir.kondratiev@...ileye.com>,
 Théo Lebrun <theo.lebrun@...tlin.com>,
 "Tawfik Bayouk" <tawfik.bayouk@...ileye.com>,
 "Thomas Petazzoni" <thomas.petazzoni@...tlin.com>,
 "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MIPS: disable MMID if GINVT is not usable

在2025年6月25日周三 下午2:27，Gregory CLEMENT写道：

Hi Gregory,

> If System-level Interconnect (aka Network on Chip) does not support
> the global invalidation, then MMID feature is not usable. Indeed the
> current implementation of MMID relies on the GINV* instruction.

Yes, it is the case if the NoC IP can't handle AMBA ACE DVM requests.

>
> Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
> ---
>  arch/mips/Kconfig                    | 6 ++++++
>  arch/mips/include/asm/cpu-features.h | 5 ++++-
>  arch/mips/mobileye/Kconfig           | 2 ++
>  3 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 
> 1e48184ecf1ec8e29c0a25de6452ece5da835e30..05ce008459b89f03fa71d94429607feb9d06526f 
> 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -2575,6 +2575,12 @@ config WAR_R10000_LLSC
>  config WAR_MIPS34K_MISSED_ITLB
>  	bool
> 
> +# Some I6500 based SoC do not support the global invalidation on their
> +# System-level Interconnect (aka Network on Chip), this have an
> +# influence on the MMID support.
> +config GINVT_UNSUPPORTED_NOC
> +	bool
> +

I believe this should be a DeviceTree property of CM node instead of Kconfig
hack.

Thanks

-- 
- Jiaxun