linux-kernel - RE: [patch V2 07/33] genirq/msi: Provide msi_create/free_device_irq

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Date:   Wed, 23 Nov 2022 08:02:46 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
CC:     "x86@...nel.org" <x86@...nel.org>, Joerg Roedel <joro@...tes.org>,
        "Will Deacon" <will@...nel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Lorenzo Pieralisi" <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        "Raj, Ashok" <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>
Subject: RE: [patch V2 07/33] genirq/msi: Provide
 msi_create/free_device_irq_domain()

> From: Thomas Gleixner <tglx@...utronix.de>
> Sent: Monday, November 21, 2022 10:38 PM
> 
> 
> +static inline void msi_remove_device_irqdomains(struct device *dev, struct
> msi_device_data *md)
> +{

'md' is unused

> 
> +/**
> + * msi_create_device_irq_domain - Create a device MSI interrupt domain
> + * @dev:		Pointer to the device
> + * @domid:		Domain id
> + * @template:		MSI domain info bundle used as template
> + * @hwsize:		Maximum number of MSI table entries (0 if unknown
> or unlimited)
> + * @domain_data:	Optional pointer to domain specific data which is set
> in
> + *			msi_domain_info::data
> + * @chip_data:		Optional pointer to chip specific data which is
> set in
> + *			msi_domain_info::chip_data
> + *
> + * Return: True on success, false otherwise

Can you elaborate why boolean type is selected instead of returning the
actual error codes? the outmost callers are all new functions:

	pci_setup_msi[x]_device_domain()
	pci_create_ims_domain()

I didn't find out any legacy convention forcing this way...

> +	bundle = kmemdup(template, sizeof(*bundle), GFP_KERNEL);
> +	if (!bundle)
> +		return false;
> +
> +	bundle->info.hwsize = hwsize ? hwsize : MSI_MAX_INDEX;

patch04 marks that hwsize being 0 means unknown or unlimited in the
header file.

but here info.hwsize always gets a value i.e. the meaning of 0 only exists
in this function. What about removing the trailing words about 0 in
patch04?

- + * @hwsize:		The hardware table size (0 if unknown/unlimited)
+ + * @hwsize:		The hardware table size