linux-kernel - Re: [PATCH 2/2] irqchip/gic-v3: Fix selection of partition domain for EPPIs

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Date:   Fri, 30 Jul 2021 11:47:30 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     James Morse <james.morse@....com>, linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH 2/2] irqchip/gic-v3: Fix selection of partition domain for EPPIs

On 29/07/21 17:27, James Morse wrote:
> commit 5f51f803826e ("irqchip/gic-v3: Add EPPI range support") added
> GIC_IRQ_TYPE_PARTITION support for EPPI to gic_irq_domain_translate(),
> and commit 52085d3f2028 ("irqchip/gic-v3: Dynamically allocate PPI
> partition descriptors") made the gic_data.ppi_descs array big enough for
> EPPI, but neither gic_irq_domain_select() nor partition_domain_translate()
> were updated.
>
> This means partitions are created by partition_create_desc() for the
> EPPI range, but can't be registered as they will always match the root
> domain and map to the summary interrupt.
>
> Update gic_irq_domain_select() to match PPI and EPPI. The fwspec for
> PPI and EPPI both start from 0. Use gic_irq_domain_translate() to find
> the hwirq from the fwspec, then convert this to a ppi index.
>
> Reported-by: Valentin Schneider <valentin.schneider@....com>
> Signed-off-by: James Morse <james.morse@....com>

Tiny nit below, regardless:

Reviewed-by: Valentin Schneider <valentin.schneider@....com>

> @@ -1518,7 +1547,12 @@ static int partition_domain_translate(struct irq_domain *d,
>       if (WARN_ON(!np))
>               return -EINVAL;
>
> -	ret = partition_translate_id(gic_data.ppi_descs[fwspec->param[1]],
> +	ret = gic_irq_domain_translate(d, fwspec, &ppi_intid, type);

This assigns @type for us, so the @type assignment at the tail of
partition_domain_translate() becomes redundant.

> +	if (WARN_ON_ONCE(ret))
> +		return 0;
> +
> +	ppi_idx = __gic_get_ppi_index(ppi_intid);
> +	ret = partition_translate_id(gic_data.ppi_descs[ppi_idx],
>                                    of_node_to_fwnode(np));
>       if (ret < 0)
>               return ret;
> --
> 2.30.2