From: "Tian, Kevin" <kevin.tian@intel.com>
To: Jason Gunthorpe <jgg@nvidia.com>,
Robin Murphy <robin.murphy@arm.com>,
Joerg Roedel <joro@8bytes.org>
Cc: Nicolin Chen <nicolinc@nvidia.com>,
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Subject: RE: [PATCH v6 1/5] iommu: Return -EMEDIUMTYPE for incompatible domain and device/group
Date: Thu, 8 Sep 2022 09:54:18 +0000 [thread overview]
Message-ID: <BN9PR11MB5276F93044F557D1473D7FCF8C409@BN9PR11MB5276.namprd11.prod.outlook.com> (raw)
In-Reply-To: Yxk6sR4JiAAn3Jf5@nvidia.com
> From: Tian, Kevin
> Sent: Thursday, September 8, 2022 5:31 PM
> > This mixture of error codes is the basic reason why a new code was
> > used, because none of the existing codes are used with any
> > consistency.
>
> btw I saw the policy for -EBUSY is also not consistent in this series.
>
> while it's correct to change -EBUSY to -EMEDIUMTYPE for omap, assuming
> that retrying another fresh domain for the said device should work:
>
> if (omap_domain->dev) {
> - dev_err(dev, "iommu domain is already attached\n");
> - ret = -EBUSY;
> + ret = -EMEDIUMTYPE;
> goto out;
> }
>
> the change in tegra-gart doesn't sound correct:
>
> if (gart->active_domain && gart->active_domain != domain) {
> - ret = -EBUSY;
> + ret = -EMEDIUMTYPE;
>
> one device cannot be attached to two domains. This fact doesn't change
> no matter how many domains are tried. In concept this check is
> redundant and should have been done by iommu core, but obviously we
> didn't pay attention to what -EBUSY actually represents in this path.
>
oops. Above is actually a right retry condition. gart is iommu instead of
device. So in concept retrying gart->active_domain for the device could
work.
So please ignore this comment.
next prev parent reply other threads:[~2022-09-08 9:55 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-15 18:14 [PATCH v6 0/5] Simplify vfio_iommu_type1 attach/detach routine Nicolin Chen
2022-08-15 18:14 ` [PATCH v6 1/5] iommu: Return -EMEDIUMTYPE for incompatible domain and device/group Nicolin Chen
2022-09-07 12:41 ` Joerg Roedel
2022-09-07 13:47 ` Jason Gunthorpe
2022-09-07 14:06 ` Joerg Roedel
2022-09-07 17:10 ` Jason Gunthorpe
2022-09-08 13:28 ` Joerg Roedel
2022-09-08 16:14 ` Jason Gunthorpe
2022-09-09 3:17 ` Nicolin Chen
2022-09-09 5:00 ` Tian, Kevin
2022-09-09 12:07 ` Jason Gunthorpe
2022-09-13 2:22 ` Tian, Kevin
2022-09-13 5:07 ` Nicolin Chen
2022-09-07 14:23 ` Robin Murphy
2022-09-07 17:00 ` Jason Gunthorpe
2022-09-07 19:41 ` Robin Murphy
2022-09-08 0:43 ` Jason Gunthorpe
2022-09-08 9:30 ` Tian, Kevin
2022-09-08 12:08 ` Jason Gunthorpe
2022-09-10 23:35 ` Nicolin Chen
2022-09-13 2:24 ` Tian, Kevin
2022-09-13 8:36 ` Nicolin Chen
2022-09-08 9:54 ` Tian, Kevin [this message]
2022-09-08 10:25 ` Robin Murphy
2022-08-15 18:14 ` [PATCH v6 2/5] vfio/iommu_type1: Prefer to reuse domains vs match enforced cache coherency Nicolin Chen
2022-08-15 18:14 ` [PATCH v6 3/5] vfio/iommu_type1: Remove the domain->ops comparison Nicolin Chen
2022-08-15 18:14 ` [PATCH v6 4/5] vfio/iommu_type1: Clean up update_dirty_scope in detach_group() Nicolin Chen
2022-08-15 18:14 ` [PATCH v6 5/5] vfio/iommu_type1: Simplify group attachment Nicolin Chen
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