linux-kernel - Re: [PATCH 3/3] irqchip/gic-v3: Remove Mediatek pseudo-NMI firmware quirk handling

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Message-ID: <ZS-8k22ZWgn5hcCd@FVFF77S0Q05N>
Date:   Wed, 18 Oct 2023 12:08:03 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Marc Zyngier <maz@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Chen-Yu Tsai <wenst@...omium.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 3/3] irqchip/gic-v3: Remove Mediatek pseudo-NMI firmware
 quirk handling

On Fri, Oct 06, 2023 at 03:15:53PM -0700, Douglas Anderson wrote:
> This is a partial revert of commit 44bd78dd2b88 ("irqchip/gic-v3:
> Disable pseudo NMIs on Mediatek devices w/ firmware issues"). In the
> patch ("arm64: Disable GiC priorities on Mediatek devices w/ firmware
> issues") we've moved the quirk handling to another place and so it's
> not needed in the GiC driver.
> 
> NOTE: this isn't a full revert because it leaves some of the changes
> to the "quirks" structure around in case future code needs it.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---

I think it might make sense to fold this into the patch adding the cpucap
detection. Otherwise, if you apply my suggestions to the first patch, there's a
2-commit window where we'll have two places that log that NMI is being disabled
due to the FW issue. That's not a functional issue, so doesn't matter that
much.

Either way:

Acked-by: Mark Rutland <mark.rutland@....com>

Mark.

> 
>  drivers/irqchip/irq-gic-v3.c | 22 +---------------------
>  1 file changed, 1 insertion(+), 21 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
> index 787ccc880b22..9ff776709ae6 100644
> --- a/drivers/irqchip/irq-gic-v3.c
> +++ b/drivers/irqchip/irq-gic-v3.c
> @@ -39,8 +39,7 @@
>  
>  #define FLAGS_WORKAROUND_GICR_WAKER_MSM8996	(1ULL << 0)
>  #define FLAGS_WORKAROUND_CAVIUM_ERRATUM_38539	(1ULL << 1)
> -#define FLAGS_WORKAROUND_MTK_GICR_SAVE		(1ULL << 2)
> -#define FLAGS_WORKAROUND_ASR_ERRATUM_8601001	(1ULL << 3)
> +#define FLAGS_WORKAROUND_ASR_ERRATUM_8601001	(1ULL << 2)
>  
>  #define GIC_IRQ_TYPE_PARTITION	(GIC_IRQ_TYPE_LPI + 1)
>  
> @@ -1790,15 +1789,6 @@ static bool gic_enable_quirk_msm8996(void *data)
>  	return true;
>  }
>  
> -static bool gic_enable_quirk_mtk_gicr(void *data)
> -{
> -	struct gic_chip_data *d = data;
> -
> -	d->flags |= FLAGS_WORKAROUND_MTK_GICR_SAVE;
> -
> -	return true;
> -}
> -
>  static bool gic_enable_quirk_cavium_38539(void *data)
>  {
>  	struct gic_chip_data *d = data;
> @@ -1891,11 +1881,6 @@ static const struct gic_quirk gic_quirks[] = {
>  		.compatible = "asr,asr8601-gic-v3",
>  		.init	= gic_enable_quirk_asr8601,
>  	},
> -	{
> -		.desc	= "GICv3: Mediatek Chromebook GICR save problem",
> -		.property = "mediatek,broken-save-restore-fw",
> -		.init	= gic_enable_quirk_mtk_gicr,
> -	},
>  	{
>  		.desc	= "GICv3: HIP06 erratum 161010803",
>  		.iidr	= 0x0204043b,
> @@ -1957,11 +1942,6 @@ static void gic_enable_nmi_support(void)
>  	if (!gic_prio_masking_enabled())
>  		return;
>  
> -	if (gic_data.flags & FLAGS_WORKAROUND_MTK_GICR_SAVE) {
> -		pr_warn("Skipping NMI enable due to firmware issues\n");
> -		return;
> -	}
> -
>  	rdist_nmi_refs = kcalloc(gic_data.ppi_nr + SGI_NR,
>  				 sizeof(*rdist_nmi_refs), GFP_KERNEL);
>  	if (!rdist_nmi_refs)
> -- 
> 2.42.0.609.gbb76f46606-goog
>