On Mon, Nov 15, 2021 at 06:35:37PM +, Robin Murphy wrote:
> On 2021-11-15 15:56, Jason Gunthorpe via iommu wrote:
> > On Mon, Nov 15, 2021 at 03:37:18PM +, Robin Murphy wrote:
> >
> > > IOMMUs, and possibly even fewer of them support VFIO, so I'm in full
> > > agreement with Greg and
On 2021-11-15 15:56, Jason Gunthorpe via iommu wrote:
On Mon, Nov 15, 2021 at 03:37:18PM +, Robin Murphy wrote:
IOMMUs, and possibly even fewer of them support VFIO, so I'm in full
agreement with Greg and Christoph that this absolutely warrants being scoped
per-bus. I mean, we literally
On Mon, Nov 15, 2021 at 11:56:13AM -0400, Jason Gunthorpe wrote:
> drivers/base/platform.c:.dma_configure = platform_dma_configure,
> drivers/bus/fsl-mc/fsl-mc-bus.c:.dma_configure =
> fsl_mc_dma_configure,
> drivers/pci/pci-driver.c: .dma_configure = pci_dma_configure,
>
On Mon, Nov 15, 2021 at 03:37:18PM +, Robin Murphy wrote:
> IOMMUs, and possibly even fewer of them support VFIO, so I'm in full
> agreement with Greg and Christoph that this absolutely warrants being scoped
> per-bus. I mean, we literally already have infrastructure to prevent drivers
>
On 2021-11-15 13:24, Jason Gunthorpe via iommu wrote:
On Mon, Nov 15, 2021 at 05:19:02AM -0800, Christoph Hellwig wrote:
On Mon, Nov 15, 2021 at 10:05:43AM +0800, Lu Baolu wrote:
@@ -566,6 +567,12 @@ static int really_probe(struct device *dev, struct
device_driver *drv)
goto
On Mon, Nov 15, 2021 at 07:59:10AM +0100, Greg Kroah-Hartman wrote:
> > @@ -566,6 +567,12 @@ static int really_probe(struct device *dev, struct
> > device_driver *drv)
> > goto done;
> > }
> >
> > + if (!drv->suppress_auto_claim_dma_owner) {
> > + ret =
On Mon, Nov 15, 2021 at 05:19:02AM -0800, Christoph Hellwig wrote:
> On Mon, Nov 15, 2021 at 10:05:43AM +0800, Lu Baolu wrote:
> > @@ -566,6 +567,12 @@ static int really_probe(struct device *dev, struct
> > device_driver *drv)
> > goto done;
> > }
> >
> > + if
On Mon, Nov 15, 2021 at 07:59:10AM +0100, Greg Kroah-Hartman wrote:
> This feels wrong to be doing it in the driver core, why doesn't the bus
> that cares about this handle it instead?
>
> You just caused all drivers in the kernel today to set and release this
> ownership, as none set this flag.
On Mon, Nov 15, 2021 at 10:05:43AM +0800, Lu Baolu wrote:
> @@ -566,6 +567,12 @@ static int really_probe(struct device *dev, struct
> device_driver *drv)
> goto done;
> }
>
> + if (!drv->suppress_auto_claim_dma_owner) {
> + ret =
On Mon, Nov 15, 2021 at 10:05:43AM +0800, Lu Baolu wrote:
> This extends really_probe() to allow checking for dma ownership conflict
> during the driver binding process. By default, the DMA_OWNER_KERNEL is
> claimed for the bound driver before calling its .probe() callback. If this
> operation
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