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authorNiklas Schnelle <schnelle@linux.ibm.com>2021-07-16 11:53:37 +0200
committerHeiko Carstens <hca@linux.ibm.com>2021-08-25 11:03:34 +0200
commit1f3f76812d5dfc791193b39c2140a8bd09962c0e (patch)
tree8f61dd33029e218e765af3ad8753856ad6d5881b /drivers/iommu/s390-iommu.c
parentcc049eecfb7adc4bfecd05eb25e425d8def96fce (diff)
s390/pci: improve DMA translation init and exit
Currently zpci_dma_init_device()/zpci_dma_exit_device() is called as part of zpci_enable_device()/zpci_disable_device() and errors for zpci_dma_exit_device() are always ignored even if we could abort. Improve upon this by moving zpci_dma_exit_device() out of zpci_disable_device() and check for errors whenever we have a way to abort the current operation. Note that for example in zpci_event_hard_deconfigured() the device is expected to be gone so we really can't abort and proceed even in case of error. Similarly move the cc == 3 special case out of zpci_unregister_ioat() and into the callers allowing to abort when finding an already disabled devices precludes proceeding with the operation. While we are at it log IOAT register/unregister errors in the s390 debugfs log, Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'drivers/iommu/s390-iommu.c')
-rw-r--r--drivers/iommu/s390-iommu.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index 6019e58ce4fb..83df387e70a3 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -90,7 +90,7 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
struct zpci_dev *zdev = to_zpci_dev(dev);
struct s390_domain_device *domain_device;
unsigned long flags;
- int rc;
+ int cc, rc;
if (!zdev)
return -ENODEV;
@@ -99,14 +99,21 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
if (!domain_device)
return -ENOMEM;
- if (zdev->dma_table)
- zpci_dma_exit_device(zdev);
+ if (zdev->dma_table) {
+ cc = zpci_dma_exit_device(zdev);
+ if (cc) {
+ rc = -EIO;
+ goto out_free;
+ }
+ }
zdev->dma_table = s390_domain->dma_table;
- rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
+ cc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
(u64) zdev->dma_table);
- if (rc)
+ if (cc) {
+ rc = -EIO;
goto out_restore;
+ }
spin_lock_irqsave(&s390_domain->list_lock, flags);
/* First device defines the DMA range limits */
@@ -130,6 +137,7 @@ static int s390_iommu_attach_device(struct iommu_domain *domain,
out_restore:
zpci_dma_init_device(zdev);
+out_free:
kfree(domain_device);
return rc;