linux-kernel - Re: [PATCH RFC v1 2/2] pci: Suspend ATS before doing FLR

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Message-ID: <aEfW53F8Gmb/NYs1@nvidia.com>
Date: Mon, 9 Jun 2025 23:55:35 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: Baolu Lu <baolu.lu@...ux.intel.com>
CC: <jgg@...dia.com>, <joro@...tes.org>, <will@...nel.org>,
	<robin.murphy@....com>, <bhelgaas@...gle.com>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<patches@...ts.linux.dev>, <pjaroszynski@...dia.com>, <vsethi@...dia.com>
Subject: Re: [PATCH RFC v1 2/2] pci: Suspend ATS before doing FLR

On Tue, Jun 10, 2025 at 12:27:04PM +0800, Baolu Lu wrote:
> On 6/10/25 02:45, Nicolin Chen wrote:
> >   int pcie_flr(struct pci_dev *dev)
> >   {
> > +	int ret = 0;
> > +
> >   	if (!pci_wait_for_pending_transaction(dev))
> >   		pci_err(dev, "timed out waiting for pending transaction; performing function level reset anyway\n");
> > +	/*
> > +	 * Per PCIe r6.3, sec 10.3.1 IMPLEMENTATION NOTE, software disables ATS
> > +	 * before initiating a Function Level Reset. So notify the iommu driver
> > +	 * that actually enabled ATS. Have to call it after waiting for pending
> > +	 * DMA transaction.
> > +	 */
> > +	if (iommu_dev_reset_prepare(&dev->dev))
> > +		pci_err(dev, "failed to stop IOMMU\n");
> 
> Need to abort here?

Yea. I think it should abort.

Thanks!
Nicolin