linux-kernel - Re: [PATCH v5 07/14] PCI: Add driver dma ownership management

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Message-ID: <20220223180757.GB390403@nvidia.com>
Date:   Wed, 23 Feb 2022 14:07:57 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, kvm@...r.kernel.org,
        rafael@...nel.org, David Airlie <airlied@...ux.ie>,
        linux-pci@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>,
        Diana Craciun <diana.craciun@....nxp.com>,
        Dmitry Osipenko <digetx@...il.com>,
        Will Deacon <will@...nel.org>,
        Stuart Yoder <stuyoder@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Cornelia Huck <cohuck@...hat.com>,
        linux-kernel@...r.kernel.org, Li Yang <leoyang.li@....com>,
        iommu@...ts.linux-foundation.org,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v5 07/14] PCI: Add driver dma ownership management

On Wed, Feb 23, 2022 at 12:00:56PM -0600, Bjorn Helgaas wrote:

> >  static int pci_dma_configure(struct device *dev)
> >  {
> > +	struct pci_driver *driver = to_pci_driver(dev->driver);
> >  	struct device *bridge;
> >  	int ret = 0;
> >  
> > +	if (!driver->no_kernel_api_dma) {
> 
> Ugh.  Double negative, totally agree this needs a better name that
> reverses the sense.  Every place you use it, you negate it again.

Greg came up with driver_managed_dma which is in the v6 version:

https://lore.kernel.org/all/20220218005521.172832-5-baolu.lu@linux.intel.com/

Thanks,
Jason