linux-kernel - Re: [PATCH 4/9] irqchip/loongson-pch-msi: Add ACPI init support

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Date:   Tue, 06 Jul 2021 14:12:31 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Huacai Chen <chenhuacai@...ngson.cn>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Huacai Chen <chenhuacai@...il.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: Re: [PATCH 4/9] irqchip/loongson-pch-msi: Add ACPI init support

On Tue, 06 Jul 2021 04:08:59 +0100,
Huacai Chen <chenhuacai@...ngson.cn> wrote:
> 
> We are preparing to add new Loongson (based on LoongArch, not MIPS)
> support. LoongArch use ACPI other than DT as its boot protocol, so
> add ACPI init support.
> 
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> ---
>  drivers/irqchip/irq-loongson-pch-msi.c | 69 ++++++++++++++++++++++++--
>  1 file changed, 64 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-loongson-pch-msi.c b/drivers/irqchip/irq-loongson-pch-msi.c
> index 32562b7e681b..adfa30046f0a 100644
> --- a/drivers/irqchip/irq-loongson-pch-msi.c
> +++ b/drivers/irqchip/irq-loongson-pch-msi.c
> @@ -1,6 +1,8 @@
>  // SPDX-License-Identifier: GPL-2.0
>  /*
>   *  Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@...goat.com>
> + *			Jianmin Lv <lvjianmin@...ngson.cn>
> + *			Huacai Chen <chenhuacai@...ngson.cn>

Same thing as the previous patch: drop it.

>   *  Loongson PCH MSI support
>   */
>  
> @@ -21,6 +23,7 @@ struct pch_msi_data {
>  	u32		irq_first;	/* The vector number that MSIs starts */
>  	u32		num_irqs;	/* The number of vectors for MSIs */
>  	unsigned long	*msi_map;
> +	struct fwnode_handle *domain_handle;
>  };
>  
>  static void pch_msi_mask_msi_irq(struct irq_data *d)
> @@ -159,7 +162,12 @@ static int pch_msi_init_domains(struct pch_msi_data *priv,
>  {
>  	struct irq_domain *middle_domain, *msi_domain;
>  
> -	middle_domain = irq_domain_create_linear(of_node_to_fwnode(node),
> +	if (node)
> +		priv->domain_handle = of_node_to_fwnode(node);
> +	else
> +		priv->domain_handle = irq_domain_alloc_fwnode((phys_addr_t *)priv);
> +
> +	middle_domain = irq_domain_create_linear(priv->domain_handle,
>  						priv->num_irqs,
>  						&pch_msi_middle_domain_ops,
>  						priv);
> @@ -171,7 +179,7 @@ static int pch_msi_init_domains(struct pch_msi_data *priv,
>  	middle_domain->parent = parent;
>  	irq_domain_update_bus_token(middle_domain, DOMAIN_BUS_NEXUS);
>  
> -	msi_domain = pci_msi_create_irq_domain(of_node_to_fwnode(node),
> +	msi_domain = pci_msi_create_irq_domain(priv->domain_handle,
>  					       &pch_msi_domain_info,
>  					       middle_domain);
>  	if (!msi_domain) {
> @@ -183,8 +191,9 @@ static int pch_msi_init_domains(struct pch_msi_data *priv,
>  	return 0;
>  }
>  
> -static int pch_msi_init(struct device_node *node,
> -			    struct device_node *parent)
> +#ifdef CONFIG_OF
> +
> +int pch_msi_of_init(struct device_node *node, struct device_node *parent)
>  {
>  	struct pch_msi_data *priv;
>  	struct irq_domain *parent_domain;
> @@ -247,4 +256,54 @@ static int pch_msi_init(struct device_node *node,
>  	return ret;
>  }
>  
> -IRQCHIP_DECLARE(pch_msi, "loongson,pch-msi-1.0", pch_msi_init);
> +IRQCHIP_DECLARE(pch_msi, "loongson,pch-msi-1.0", pch_msi_of_init);
> +
> +#endif
> +
> +#ifdef CONFIG_ACPI
> +
> +struct fwnode_handle *pch_msi_acpi_init(struct fwnode_handle *parent,
> +					struct acpi_madt_msi_pic *acpi_pchmsi)
> +{
> +	int ret;
> +	struct pch_msi_data *priv;
> +	struct irq_domain *parent_domain;
> +
> +	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return NULL;
> +
> +	mutex_init(&priv->msi_map_lock);
> +
> +	priv->doorbell = acpi_pchmsi->msg_address;
> +	priv->irq_first = acpi_pchmsi->start;
> +	priv->num_irqs = acpi_pchmsi->count;
> +
> +	parent_domain = irq_find_matching_fwnode(parent, DOMAIN_BUS_ANY);
> +	if (!parent_domain) {
> +		pr_err("Failed to find the parent domain\n");
> +		return NULL;
> +	}
> +
> +	priv->msi_map = bitmap_zalloc(priv->num_irqs, GFP_KERNEL);
> +	if (!priv->msi_map)
> +		goto err_priv;
> +
> +	pr_debug("Registering %d MSIs, starting at %d\n",
> +		 priv->num_irqs, priv->irq_first);
> +
> +	ret = pch_msi_init_domains(priv, NULL, parent_domain);
> +	if (ret)
> +		goto err_map;
> +
> +	return priv->domain_handle;
> +
> +err_map:
> +	kfree(priv->msi_map);
> +err_priv:
> +	kfree(priv);
> +
> +	return NULL;
> +}
> +
> +#endif

Same thing. You are pointlessly duplicating the logic.

	M.

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