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iommu/amd: Add invalid_ppr callback

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This callback can be used to change the PRI response code
sent to a device when a PPR fault fails.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2011-11-28 14:36:36 +01:00
parent 8736b2c331
commit 175d614673
2 changed files with 86 additions and 5 deletions
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34
include/linux/amd-iommu.h
View file

@ -28,9 +28,6 @@ struct task_struct;
struct pci_dev;
extern int amd_iommu_detect(void);
extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
struct task_struct *task);
extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
/**
@ -91,6 +88,37 @@ extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
*/
extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
/**
* amd_iommu_set_invalid_ppr_cb() - Register a call-back for failed
* PRI requests
* @pdev: The PCI device the call-back should be registered for
* @cb: The call-back function
*
* The IOMMUv2 driver invokes this call-back when it is unable to
* successfully handle a PRI request. The device driver can then decide
* which PRI response the device should see. Possible return values for
* the call-back are:
*
* - AMD_IOMMU_INV_PRI_RSP_SUCCESS - Send SUCCESS back to the device
* - AMD_IOMMU_INV_PRI_RSP_INVALID - Send INVALID back to the device
* - AMD_IOMMU_INV_PRI_RSP_FAIL - Send Failure back to the device,
* the device is required to disable
* PRI when it receives this response
*
* The function returns 0 on success or negative value on error.
*/
#define AMD_IOMMU_INV_PRI_RSP_SUCCESS 0
#define AMD_IOMMU_INV_PRI_RSP_INVALID 1
#define AMD_IOMMU_INV_PRI_RSP_FAIL 2
typedef int (*amd_iommu_invalid_ppr_cb)(struct pci_dev *pdev,
int pasid,
unsigned long address,
u16);
extern int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev,
amd_iommu_invalid_ppr_cb cb);
#else
static inline int amd_iommu_detect(void) { return -ENODEV; }