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From:   Thomas Gleixner <tglx@linutronix.de>
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To:     "Tian, Kevin" <kevin.tian@intel.com>,
        LKML <linux-kernel@vger.kernel.org>
Cc:     "x86@kernel.org" <x86@kernel.org>, Joerg Roedel <joro@8bytes.org>,
        Will Deacon <will@kernel.org>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
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        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jason Gunthorpe <jgg@mellanox.com>,
        "Jiang, Dave" <dave.jiang@intel.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        "Williams, Dan J" <dan.j.williams@intel.com>,
        Logan Gunthorpe <logang@deltatee.com>,
        "Raj, Ashok" <ashok.raj@intel.com>, Jon Mason <jdmason@kudzu.us>,
        Allen Hubbe <allenbh@gmail.com>
Subject: RE: [patch V2 19/33] genirq/msi: Provide msi_desc::msi_data
In-Reply-To: <BN9PR11MB5276C788BFDBC254CE5912278C0C9@BN9PR11MB5276.namprd11.prod.outlook.com>
References: <20221121083657.157152924@linutronix.de>
 <20221121091327.546352933@linutronix.de>
 <BN9PR11MB5276C788BFDBC254CE5912278C0C9@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Wed, 23 Nov 2022 12:41:26 +0100
Message-ID: <87wn7lew49.ffs@tglx>
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On Wed, Nov 23 2022 at 08:27, Kevin Tian wrote:

>> From: Thomas Gleixner <tglx@linutronix.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.

Ooops.