linux-kernel - Re: [PATCH 2/2] PCI: sophgo-dwc: Add Sophgo SG2044 PCIe driver

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Message-ID: <20250304173632.GA243820@bhelgaas>
Date: Tue, 4 Mar 2025 11:36:32 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Inochi Amaoto <inochiama@...il.com>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen Wang <unicorn_wang@...look.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Johan Hovold <johan+linaro@...nel.org>,
	Shashank Babu Chinta Venkata <quic_schintav@...cinc.com>,
	Niklas Cassel <cassel@...nel.org>, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, sophgo@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
	Yixun Lan <dlan@...too.org>, Longbin Li <looong.bin@...il.com>
Subject: Re: [PATCH 2/2] PCI: sophgo-dwc: Add Sophgo SG2044 PCIe driver

On Tue, Mar 04, 2025 at 03:12:38PM +0800, Inochi Amaoto wrote:
> Add support for DesignWare-based PCIe controller in SG2044 SoC.

> +static void sophgo_intx_irq_eoi(struct irq_data *d)
> +{
> +}

The empty .irq_eoi() is unusual.  Why do you need it?

I see that the existence of chip->irq_eoi() makes a difference in
chained_irq_enter() and chained_irq_exit(), but I'm surprised that
this is the only driver in drivers/pci/controller/ that implements an
empty .irq_eoi().

A comment here about what is special would be helpful.

> +static struct irq_chip sophgo_intx_irq_chip = {
> +	.name			= "INTx",
> +	.irq_mask		= sophgo_intx_irq_mask,
> +	.irq_unmask		= sophgo_intx_irq_unmask,
> +	.irq_eoi		= sophgo_intx_irq_eoi,
> +};