linux-kernel - Re: [PATCH RFC v2 04/18] irq/dev-msi: Introduce APIs to allocate/free dev-msi interrupts

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Date:   Tue, 21 Jul 2020 13:25:01 -0300
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Dave Jiang <dave.jiang@...el.com>
Cc:     vkoul@...nel.org, megha.dey@...el.com, maz@...nel.org,
        bhelgaas@...gle.com, rafael@...nel.org, gregkh@...uxfoundation.org,
        tglx@...utronix.de, hpa@...or.com, alex.williamson@...hat.com,
        jacob.jun.pan@...el.com, ashok.raj@...el.com, yi.l.liu@...el.com,
        baolu.lu@...el.com, kevin.tian@...el.com, sanjay.k.kumar@...el.com,
        tony.luck@...el.com, jing.lin@...el.com, dan.j.williams@...el.com,
        kwankhede@...dia.com, eric.auger@...hat.com, parav@...lanox.com,
        dave.hansen@...el.com, netanelg@...lanox.com, shahafs@...lanox.com,
        yan.y.zhao@...ux.intel.com, pbonzini@...hat.com,
        samuel.ortiz@...el.com, mona.hossain@...el.com,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-pci@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH RFC v2 04/18] irq/dev-msi: Introduce APIs to
 allocate/free dev-msi interrupts

On Tue, Jul 21, 2020 at 09:02:41AM -0700, Dave Jiang wrote:
> From: Megha Dey <megha.dey@...el.com>
> 
> The dev-msi interrupts are to be allocated/freed only for custom devices,
> not standard PCI-MSIX devices.
> 
> These interrupts are device-defined and they are distinct from the already
> existing msi interrupts:
> pci-msi: Standard PCI MSI/MSI-X setup format
> platform-msi: Platform custom, but device-driver opaque MSI setup/control
> arch-msi: fallback for devices not assigned to the generic PCI domain
> dev-msi: device defined IRQ domain for ancillary devices. For e.g. DSA
> portal devices use device specific IMS(Interrupt message store) interrupts.
> 
> dev-msi interrupts are represented by their own device-type. That means
> dev->msi_list is never contended for different interrupt types. It
> will either be all PCI-MSI or all device-defined.

Not sure I follow this, where is the enforcement that only dev-msi or
normal MSI is being used at one time on a single struct device?

Jason