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iommu/vt-d: Add callback to device driver on page faults

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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse
2015-10-13 17:18:10 +01:00
parent a222a7f0bb
commit 0204a49609
3 changed files with 46 additions and 4 deletions
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include/linux/intel-svm.h
+18 -3
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@@ -20,10 +20,23 @@
struct device;
struct svm_dev_ops {
void (*fault_cb)(struct device *dev, int pasid, u64 address,
u32 private, int rwxp, int response);
};
/* Values for rxwp in fault_cb callback */
#define SVM_REQ_READ (1<<3)
#define SVM_REQ_WRITE (1<<2)
#define SVM_REQ_EXEC (1<<1)
#define SVM_REQ_PRIV (1<<0)
/**
* intel_svm_bind_mm() - Bind the current process to a PASID
* @dev: Device to be granted acccess
* @pasid: Address for allocated PASID
* @flags: Flags. Later for requesting supervisor mode, etc.
* @ops: Callbacks to device driver
*
* This function attempts to enable PASID support for the given device.
* If the @pasid argument is non-%NULL, a PASID is allocated for access
@@ -45,7 +58,8 @@ struct device;
* Multiple calls from the same process may result in the same PASID
* being re-used. A reference count is kept.
*/
extern int intel_svm_bind_mm(struct device *dev, int *pasid);
extern int intel_svm_bind_mm(struct device *dev, int *pasid, int flags,
struct svm_dev_ops *ops);
/**
* intel_svm_unbind_mm() - Unbind a specified PASID
@@ -66,7 +80,8 @@ extern int intel_svm_unbind_mm(struct device *dev, int pasid);
#else /* CONFIG_INTEL_IOMMU_SVM */
static inline int intel_svm_bind_mm(struct device *dev, int *pasid)
static inline int intel_svm_bind_mm(struct device *dev, int *pasid,
int flags, struct svm_dev_ops *ops)
{
return -ENOSYS;
}
@@ -77,6 +92,6 @@ static inline int intel_svm_unbind_mm(struct device *dev, int pasid)
}
#endif /* CONFIG_INTEL_IOMMU_SVM */
#define intel_svm_available(dev) (!intel_svm_bind_mm((dev), NULL))
#define intel_svm_available(dev) (!intel_svm_bind_mm((dev), NULL, 0, NULL))
#endif /* __INTEL_SVM_H__ */