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PCI: Enable is not exposed as a PASID capability 

The PASID ECN indicates bit 0 is reserved in the capability register.
Switch pci_enable_pasid() to error if PASID is already enabled and
don't expose enable as a feature in pci_pasid_features().

Reviewed-by: Joerg Roedel <joerg.roedel@amd.com>
Tested-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Alex Williamson 2011-11-11 10:06:56 -07:00 committed by Jesse Barnes
parent a776c491ca
commit 60fe823837
1 changed files with 2 additions and 3 deletions
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5
drivers/pci/ats.c
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@ -348,7 +348,7 @@ int pci_enable_pasid(struct pci_dev *pdev, int features)
pci_read_config_word(pdev, pos + PCI_PASID_CONTROL_OFF, &control);
pci_read_config_word(pdev, pos + PCI_PASID_CAP_OFF, &supported);
if (!(supported & PCI_PASID_ENABLE))
if (control & PCI_PASID_ENABLE)
return -EINVAL;
supported &= PCI_PASID_EXEC | PCI_PASID_PRIV;
@ -390,7 +390,6 @@ EXPORT_SYMBOL_GPL(pci_disable_pasid);
* Returns a negative value when no PASI capability is present.
* Otherwise is returns a bitmask with supported features. Current
* features reported are:
* PCI_PASID_ENABLE - PASID capability can be enabled
* PCI_PASID_EXEC - Execute permission supported
* PCI_PASID_PRIV - Priviledged mode supported
*/
@ -405,7 +404,7 @@ int pci_pasid_features(struct pci_dev *pdev)
pci_read_config_word(pdev, pos + PCI_PASID_CAP_OFF, &supported);
supported &= PCI_PASID_ENABLE | PCI_PASID_EXEC | PCI_PASID_PRIV;
supported &= PCI_PASID_EXEC | PCI_PASID_PRIV;
return supported;
}