linux-kernel - Re: [PATCH v12 19/25] irqchip/riscv-imsic: Add device MSI domain support for platform devices

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Date: Tue, 06 Feb 2024 16:36:36 +0100
From: Björn Töpel <bjorn@...nel.org>
To: Anup Patel <apatel@...tanamicro.com>, Palmer Dabbelt
 <palmer@...belt.com>, Paul Walmsley <paul.walmsley@...ive.com>, Thomas
 Gleixner <tglx@...utronix.de>, Rob Herring <robh+dt@...nel.org>, Krzysztof
 Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Frank Rowand
 <frowand.list@...il.com>, Conor Dooley <conor+dt@...nel.org>
Cc: Anup Patel <apatel@...tanamicro.com>, devicetree@...r.kernel.org,
 Saravana Kannan <saravanak@...gle.com>, Marc Zyngier <maz@...nel.org>,
 Anup Patel <anup@...infault.org>, linux-kernel@...r.kernel.org, Atish
 Patra <atishp@...shpatra.org>, linux-riscv@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, Andrew Jones
 <ajones@...tanamicro.com>
Subject: Re: [PATCH v12 19/25] irqchip/riscv-imsic: Add device MSI domain
 support for platform devices

Anup Patel <apatel@...tanamicro.com> writes:

> The Linux platform MSI support allows per-device MSI domains so let
> us add a platform irqchip driver for RISC-V IMSIC which provides a
> base IRQ domain with MSI parent support for platform device domains.
>
> This driver assumes that the IMSIC state is already initialized by
> the IMSIC early driver.
>
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>

[...]

> diff --git a/drivers/irqchip/irq-riscv-imsic-platform.c b/drivers/irqchip/irq-riscv-imsic-platform.c
> new file mode 100644
> index 000000000000..65791a6b0727
> --- /dev/null
> +++ b/drivers/irqchip/irq-riscv-imsic-platform.c
> @@ -0,0 +1,371 @@

[...]

> +static int imsic_irq_retrigger(struct irq_data *d)
> +{
> +	struct imsic_vector *vec = irq_data_get_irq_chip_data(d);
> +	struct imsic_local_config *local;
> +
> +	if (WARN_ON(vec == NULL))
> +		return -ENOENT;
> +
> +	local = per_cpu_ptr(imsic->global.local, vec->cpu);
> +	writel(vec->local_id, local->msi_va);

Change to writel_relaxed().