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iommu/ioasid: Introduce a helper to check for valid PASIDs

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Define a pasid_valid() helper to check if a given PASID is valid.

  [ bp: Massage commit message. ]

Suggested-by: Ashok Raj <ashok.raj@intel.com>
Suggested-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20220207230254.3342514-4-fenghua.yu@intel.com
This commit is contained in:
Fenghua Yu 2022-02-07 15:02:46 -08:00 committed by Borislav Petkov
parent 7a853c2d59
commit 7a5fbc9bcb
1 changed files with 9 additions and 0 deletions
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9
include/linux/ioasid.h
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@ -41,6 +41,10 @@ void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid,
int ioasid_register_allocator(struct ioasid_allocator_ops *allocator);
void ioasid_unregister_allocator(struct ioasid_allocator_ops *allocator);
int ioasid_set_data(ioasid_t ioasid, void *data);
static inline bool pasid_valid(ioasid_t ioasid)
{
return ioasid != INVALID_IOASID;
}
#else /* !CONFIG_IOASID */
static inline ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min,
@ -78,5 +82,10 @@ static inline int ioasid_set_data(ioasid_t ioasid, void *data)
return -ENOTSUPP;
}
static inline bool pasid_valid(ioasid_t ioasid)
{
return false;
}
#endif /* CONFIG_IOASID */
#endif /* __LINUX_IOASID_H */