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iommu/s390: Tolerate repeat attach_dev calls

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Since commit 0286300e60 ("iommu: iommu_group_claim_dma_owner() must
always assign a domain") s390-iommu will get called to allocate multiple
unmanaged iommu domains for a vfio-pci device -- however the current
s390-iommu logic tolerates only one.  Recognize that multiple domains can
be allocated and handle switching between DMA or different iommu domain
tables during attach_dev.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20220519182929.581898-1-mjrosato@linux.ibm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Matthew Rosato 2022-05-19 14:29:29 -04:00 committed by Joerg Roedel
parent 0286300e60
commit fa7e9ecc5e
1 changed files with 12 additions and 3 deletions
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15
drivers/iommu/s390-iommu.c
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@ -99,7 +99,7 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
if (!domain_device)
return -ENOMEM;
if (zdev->dma_table) {
if (zdev->dma_table && !zdev->s390_domain) {
cc = zpci_dma_exit_device(zdev);
if (cc) {
rc = -EIO;
@ -107,6 +107,9 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
}
}
if (zdev->s390_domain)
zpci_unregister_ioat(zdev, 0);
zdev->dma_table = s390_domain->dma_table;
cc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
virt_to_phys(zdev->dma_table));
@ -136,7 +139,13 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
return 0;
out_restore:
zpci_dma_init_device(zdev);
if (!zdev->s390_domain) {
zpci_dma_init_device(zdev);
} else {
zdev->dma_table = zdev->s390_domain->dma_table;
zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
virt_to_phys(zdev->dma_table));
}
out_free:
kfree(domain_device);
@ -167,7 +176,7 @@ static void s390_iommu_detach_device(struct iommu_domain *domain,
}
spin_unlock_irqrestore(&s390_domain->list_lock, flags);
if (found) {
if (found && (zdev->s390_domain == s390_domain)) {
zdev->s390_domain = NULL;
zpci_unregister_ioat(zdev, 0);
zpci_dma_init_device(zdev);