[PATCH v5 5/5] pci: Suspend iommu function prior to resetting a device

[Nicolin Chen]

On Tue, Nov 18, 2025 at 07:53:27AM +0000, Tian, Kevin wrote:
> > From: Nicolin Chen <nicolinc at nvidia.com>
> > And how do you think of the followings?
> > 
> > /*
> >  * Per PCIe r6.3, sec 10.3.1 IMPLEMENTATION NOTE, software disables ATS
> > before
> >  * initiating a reset. Though not all IOMMU drivers calls pci_enable_ats(), it
> >  * only gets invoked in IOMMU driver. And it is racy to check dev-
> > >ats_enabled
> >  * here, as a concurrent IOMMU attachment can enable ATS right after this
> > line.
> >  *
> >  * Notify the IOMMU driver to stop IOMMU translations until the reset is
> > done,
> >  * to ensure that the ATS function and its related invalidations are disabled.
> >  */
> > 
> 
> I'd remove the words between "Though not ..." and "after this line", which
> could be explained in iommu side following Bjorn's suggestion to not check
> pci_ats_supported() in pci core.

OK. Thanks!

Nicolin