linux-kernel - RE: [patch V2 19/33] genirq/msi: Provide msi_desc::msi

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Date:   Wed, 23 Nov 2022 08:27:19 +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 19/33] genirq/msi: Provide msi_desc::msi_data

> From: Thomas Gleixner <tglx@...utronix.de>
> Sent: Monday, November 21, 2022 10:38 PM
> 
> The upcoming support for PCI/IMS requires to store some information
> related
> to the message handling in the MSI descriptor, e.g. PASID or a pointer to a
> queue.
> 
> Provide a generic storage struct which maps over the existing PCI specific
> storage which means the size of struct msi_desc is not getting bigger.
> 
> It contains a iomem pointer for device memory based IMS and a union of a
> u64 and a void pointer which allows the device specific IMS implementations
> to store the necessary information.

stale comment.

> 
> The iomem pointer is set up by the domain allocation functions.
> 
> The data union msi_dev_cookie is going to be handed in when allocating an

no msi_dev_cookie now.