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

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Message-ID: <a9adee06-b5d5-4b07-bfa5-68a0153699f3@linux.microsoft.com>
Date: Wed, 15 May 2024 11:34:18 -0700
From: Roman Kisel <romank@...ux.microsoft.com>
To: Bjorn Helgaas <helgaas@...nel.org>
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 5/15/2024 11:12 AM, Bjorn Helgaas wrote:
> 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.
> 
Many thanks for suggesting that :)

>>>> +		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.
> 
Appreciate showing me the data-driven way of reasoning about that very much!

> Bjorn

-- 
Thank you,
Roman