On Thu, Jan 06, 2022 at 10:20:50AM +0800, Lu Baolu wrote:
> The individual device driver should use iommu_attach/detach_device()
> for domain attachment/detachment.
>
> Signed-off-by: Lu Baolu <baolu...@linux.intel.com>
> drivers/iommu/amd/iommu_v2.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/amd/iommu_v2.c b/drivers/iommu/amd/iommu_v2.c
> index 58da08cc3d01..7d9d0fe89064 100644
> +++ b/drivers/iommu/amd/iommu_v2.c
> @@ -133,7 +133,7 @@ static void free_device_state(struct device_state
> *dev_state)
> if (WARN_ON(!group))
> return;
>
> - iommu_detach_group(dev_state->domain, group);
> + iommu_detach_device(dev_state->domain, &dev_state->pdev->dev);
>
> iommu_group_put(group);
This is the only user of the group in the function all the
group_get/put should be deleted too.
Joerg said in commit 55c99a4dc50f ("iommu/amd: Use
iommu_attach_group()") that the device API doesn't work here because
there are multi-device groups?
But I'm not sure how this can work with multi-device groups - this
seems to assigns a domain setup for direct map, so perhaps this only
works if all devices are setup for direct map?
> @@ -791,7 +791,7 @@ int amd_iommu_init_device(struct pci_dev *pdev, int
> pasids)
> goto out_free_domain;
> }
>
> - ret = iommu_attach_group(dev_state->domain, group);
> + ret = iommu_attach_device(dev_state->domain, &pdev->dev);
> if (ret != 0)
> goto out_drop_group;
Same comment here
Jason
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