linux-kernel - Re: [PATCH v2 6/6] drivers/pci/hyperv/arm64: vPCI MSI IRQ domain from DT

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Message-ID: <20240515181238.GA2129352@bhelgaas>
Date: Wed, 15 May 2024 13:12:38 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Roman Kisel <romank@...ux.microsoft.com>
Cc: Saurabh Singh Sengar <ssengar@...ux.microsoft.com>, arnd@...db.de,
	bhelgaas@...gle.com, bp@...en8.de, catalin.marinas@....com,
	dave.hansen@...ux.intel.com, decui@...rosoft.com,
	haiyangz@...rosoft.com, hpa@...or.com, kw@...ux.com,
	kys@...rosoft.com, lenb@...nel.org, lpieralisi@...nel.org,
	mingo@...hat.com, mhklinux@...look.com, rafael@...nel.org,
	robh@...nel.org, tglx@...utronix.de, wei.liu@...nel.org,
	will@...nel.org, linux-acpi@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, x86@...nel.org, ssengar@...rosoft.com,
	sunilmut@...rosoft.com, vdso@...bites.dev
Subject: Re: [PATCH v2 6/6] drivers/pci/hyperv/arm64: vPCI MSI IRQ domain
 from DT

On Wed, May 15, 2024 at 09:34:09AM -0700, Roman Kisel wrote:
> 
> 
> On 5/15/2024 2:48 AM, Saurabh Singh Sengar wrote:
> > On Tue, May 14, 2024 at 03:43:53PM -0700, Roman Kisel wrote:
> > > The hyperv-pci driver uses ACPI for MSI IRQ domain configuration
> > > on arm64 thereby it won't be able to do that in the VTL mode where
> > > only DeviceTree can be used.
> > > 
> > > Update the hyperv-pci driver to discover interrupt configuration
> > > via DeviceTree.
> > 
> > Subject prefix should be "PCI: hv:"
> > 
> Thanks!

"git log --oneline <file>" is a good guide in general and could be
used for other patches in this series as well.

> > > +		hv_msi_gic_irq_domain = acpi_irq_create_hierarchy(0, HV_PCI_MSI_SPI_NR,
> > > +			fn, &hv_pci_domain_ops,
> > > +			chip_data);
> > 
> > Upto 100 characters per line are supported now, we can have less
> > line breaks.
> > 
> Fewer line breaks would make this look nicer, let me know if you had any
> particular style in mind.

Let's not use the checkpatch "$max_line_length = 100" as a guide.

The pci-hyperv.c file as a whole is obviously formatted to fit in 80
columns with few exceptions.

IMO it would not be an improvement to scatter random 100-column lines
throughout.  That would just mean the file would look bad in an
80-column terminal and there would be a lot of wasted space in a
100-column terminal.

Bjorn