Re: [PATCH v11 11/16] iommu/arm-smmu-v3: Add CMDQ_PROD_STOP_FLAG to gate CMDQ submissions

[Jason Gunthorpe]

On Tue, Oct 06, 2026 at 10:26:41AM -0700, Nicolin Chen wrote:
> > pci_dev_reset_iommu_prepare/done() pair (with slight refactoring) in EP's
> > suspend/resume?
> 
> That sounds right to me, though a different API for suspend/resume
> will be required. And call them in pci_pm_runtime_suspend/resume()
> maybe.
> 
> Jason, how do you think about this?

Maybe lets just start by refusing power management when ATS is on? For
PCIe devices too?

It isn't just ARM that has this issue, every iommu is busted if you
suspend the PCI device while an ATS domain is still active..

Jason