linux-kernel - Re: [PATCH V2 1/2] irqchip/loongson-pch-pic: Support to set irq type for ACPI path

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Date:   Sun, 09 Oct 2022 02:08:44 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Jianmin Lv <lvjianmin@...ngson.cn>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        loongarch@...ts.linux.dev, Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Len Brown <lenb@...nel.org>, rafael@...nel.org,
        linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH V2 1/2] irqchip/loongson-pch-pic: Support to set irq type for ACPI path

On Sat, 08 Oct 2022 03:51:49 +0100,
Jianmin Lv <lvjianmin@...ngson.cn> wrote:
> 
> For ACPI path, the translate callback used IRQ_TYPE_NONE and ignored
> the irq type in fwspec->param[1]. For supporting to set type for
> irqs of the irqdomain, fwspec->param[1] should be used to get irq
> type.
> 
> On Loongson platform, the irq trigger type of PCI devices is
> high level, so high level triggered type is inputed to acpi_register_gsi
> when create irq mapping for PCI devices.
> 
> Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
> ---
>  drivers/acpi/pci_irq.c                 | 6 ++++--
>  drivers/irqchip/irq-loongson-pch-pic.c | 9 ++++++++-
>  2 files changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
> index 08e15774fb9f..ff30ceca2203 100644
> --- a/drivers/acpi/pci_irq.c
> +++ b/drivers/acpi/pci_irq.c
> @@ -387,13 +387,15 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
>  	u8 pin;
>  	int triggering = ACPI_LEVEL_SENSITIVE;
>  	/*
> -	 * On ARM systems with the GIC interrupt model, level interrupts
> +	 * On ARM systems with the GIC interrupt model, or LoongArch
> +	 * systems with the LPIC interrupt model, level interrupts
>  	 * are always polarity high by specification; PCI legacy
>  	 * IRQs lines are inverted before reaching the interrupt
>  	 * controller and must therefore be considered active high
>  	 * as default.
>  	 */
> -	int polarity = acpi_irq_model == ACPI_IRQ_MODEL_GIC ?
> +	int polarity = acpi_irq_model == ACPI_IRQ_MODEL_GIC ||
> +		       acpi_irq_model == ACPI_IRQ_MODEL_LPIC ?
>  				      ACPI_ACTIVE_HIGH : ACPI_ACTIVE_LOW;
>  	char *link = NULL;
>  	char link_desc[16];

This is one patch adding support for the LPIC model.

> diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
> index c01b9c257005..5576c97fec85 100644
> --- a/drivers/irqchip/irq-loongson-pch-pic.c
> +++ b/drivers/irqchip/irq-loongson-pch-pic.c
> @@ -159,11 +159,18 @@ static int pch_pic_domain_translate(struct irq_domain *d,
>  		return -EINVAL;
>  
>  	if (of_node) {
> +		if (fwspec->param_count < 2)
> +			return -EINVAL;
> +

This is another patch fixing a regression introduced by bcdd75c596c8.

>  		*hwirq = fwspec->param[0] + priv->ht_vec_base;
>  		*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
>  	} else {
>  		*hwirq = fwspec->param[0] - priv->gsi_base;
> -		*type = IRQ_TYPE_NONE;
> +
> +		if (fwspec->param_count > 1)
> +			*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
> +		else
> +			*type = IRQ_TYPE_NONE;

This is yet another patch fixing PCI INTx handling. You can also move
the check against 'param_count < 1' in this block.

>  	}
>  
>  	return 0;

	M.

-- 
Without deviation from the norm, progress is not possible.