diff options
Diffstat (limited to 'drivers/iommu/intel/pasid.h')
| -rw-r--r-- | drivers/iommu/intel/pasid.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/iommu/intel/pasid.h b/drivers/iommu/intel/pasid.h index b4c85242dc79..0b303bd0b0c1 100644 --- a/drivers/iommu/intel/pasid.h +++ b/drivers/iommu/intel/pasid.h @@ -234,10 +234,24 @@ static inline void pasid_set_wpe(struct pasid_entry *pe) */ static inline void pasid_set_present(struct pasid_entry *pe) { + dma_wmb(); pasid_set_bits(&pe->val[0], 1 << 0, 1); } /* + * Clear the Present (P) bit (bit 0) of a scalable-mode PASID table entry. + * This initiates the transition of the entry's ownership from hardware + * to software. The caller is responsible for fulfilling the invalidation + * handshake recommended by the VT-d spec, Section 6.5.3.3 (Guidance to + * Software for Invalidations). + */ +static inline void pasid_clear_present(struct pasid_entry *pe) +{ + pasid_set_bits(&pe->val[0], 1 << 0, 0); + dma_wmb(); +} + +/* * Setup Page Walk Snoop bit (Bit 87) of a scalable mode PASID * entry. */ |