From: Jason Gunthorpe <jgg@nvidia.com>
To: Samiullah Khawaja <skhawaja@google.com>
Cc: Baolu Lu <baolu.lu@linux.intel.com>,
Nicolin Chen <nicolinc@nvidia.com>,
will@kernel.org, robin.murphy@arm.com, joro@8bytes.org,
bhelgaas@google.com, rafael@kernel.org, lenb@kernel.org,
praan@google.com, kees@kernel.org, smostafa@google.com,
Alexander.Grest@microsoft.com, kevin.tian@intel.com,
miko.lenczewski@arm.com, linux-arm-kernel@lists.infradead.org,
iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org,
vsethi@nvidia.com
Subject: Re: [PATCH v1 2/2] iommu/arm-smmu-v3: Recover ATC invalidate timeouts
Date: Wed, 11 Mar 2026 09:12:45 -0300 [thread overview]
Message-ID: <20260311121245.GA1448102@nvidia.com> (raw)
In-Reply-To: <abB1VJ5Op24dMIog@google.com>
On Tue, Mar 10, 2026 at 08:00:45PM +0000, Samiullah Khawaja wrote:
> On Fri, Mar 06, 2026 at 04:26:52PM -0400, Jason Gunthorpe wrote:
> > On Fri, Mar 06, 2026 at 08:22:08PM +0000, Samiullah Khawaja wrote:
> >
> > > But do you think doing the timeout logic without fencing would be good
> > > enough?
> >
> > It is what ARM and AMD do, so I wouldn't object to it.
>
> I think without any back pressure to the caller, a device will be able
> to fill the invalidation queue with device IOTLB invalidations that get
> stuck until the HW timeout occurs.
Yes, all drivers have this problem currently.
Jason
next prev parent reply other threads:[~2026-03-11 12:12 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-05 5:21 [PATCH v1 0/2] iommu/arm-smmu-v3: Reset PCI device upon ATC invalidate timeout Nicolin Chen
2026-03-05 5:21 ` [PATCH v1 1/2] iommu: Do not call pci_dev_reset_iommu_done() unless reset succeeds Nicolin Chen
2026-03-05 5:21 ` [PATCH v1 2/2] iommu/arm-smmu-v3: Recover ATC invalidate timeouts Nicolin Chen
2026-03-05 15:15 ` kernel test robot
2026-03-05 15:24 ` Robin Murphy
2026-03-05 21:06 ` Nicolin Chen
2026-03-05 23:30 ` Nicolin Chen
2026-03-05 23:52 ` Jason Gunthorpe
2026-03-06 15:24 ` Robin Murphy
2026-03-06 15:56 ` Jason Gunthorpe
2026-03-10 19:34 ` Pranjal Shrivastava
2026-03-05 15:39 ` Jason Gunthorpe
2026-03-05 21:15 ` Nicolin Chen
2026-03-05 23:41 ` Jason Gunthorpe
2026-03-06 1:29 ` Nicolin Chen
2026-03-06 1:33 ` Jason Gunthorpe
2026-03-06 5:06 ` Nicolin Chen
2026-03-06 13:02 ` Jason Gunthorpe
2026-03-06 19:20 ` Nicolin Chen
2026-03-06 19:22 ` Jason Gunthorpe
2026-03-06 19:39 ` Nicolin Chen
2026-03-06 19:47 ` Jason Gunthorpe
2026-03-10 19:40 ` Pranjal Shrivastava
2026-03-10 19:57 ` Nicolin Chen
2026-03-10 20:04 ` Pranjal Shrivastava
2026-03-06 13:22 ` Robin Murphy
2026-03-06 14:01 ` Jason Gunthorpe
2026-03-06 20:18 ` Nicolin Chen
2026-03-06 20:22 ` Jason Gunthorpe
2026-03-06 20:34 ` Nicolin Chen
2026-03-06 3:22 ` Baolu Lu
2026-03-06 13:00 ` Jason Gunthorpe
2026-03-06 19:35 ` Samiullah Khawaja
2026-03-06 19:43 ` Jason Gunthorpe
2026-03-06 19:59 ` Samiullah Khawaja
2026-03-06 20:03 ` Jason Gunthorpe
2026-03-06 20:22 ` Samiullah Khawaja
2026-03-06 20:26 ` Jason Gunthorpe
2026-03-10 20:00 ` Samiullah Khawaja
2026-03-11 12:12 ` Jason Gunthorpe [this message]
2026-03-06 2:35 ` kernel test robot
2026-03-10 19:16 ` Pranjal Shrivastava
2026-03-10 19:51 ` Nicolin Chen
2026-03-10 20:00 ` Pranjal Shrivastava
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