diff options
Diffstat (limited to 'drivers/iommu/intel/dmar.c')
| -rw-r--r-- | drivers/iommu/intel/dmar.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c index bc94059a5b87..b00a0ceb2d13 100644 --- a/drivers/iommu/intel/dmar.c +++ b/drivers/iommu/intel/dmar.c @@ -1106,6 +1106,13 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd) raw_spin_lock_init(&iommu->register_lock); /* + * A value of N in PSS field of eCap register indicates hardware + * supports PASID field of N+1 bits. + */ + if (pasid_supported(iommu)) + iommu->iommu.max_pasids = 2UL << ecap_pss(iommu->ecap); + + /* * This is only for hotplug; at boot time intel_iommu_enabled won't * be set yet. When intel_iommu_init() runs, it registers the units * present at boot time, then sets intel_iommu_enabled. |