iommu/amd: Use protection_domain.flags to check page table mode

Page table mode (v1, v2 or pt) is per domain property. Recently we have
enhanced protection_domain.pd_mode to track per domain page table mode.
Use that variable to check the page table mode instead of global
'amd_iommu_pgtable' in {map/unmap}_pages path.
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240205115615.6053-7-vasant.hegde@amd.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd/iommu.c

@@ -2310,7 +2310,7 @@ static int amd_iommu_map_pages(struct iommu_domain *dom, unsigned long iova,
 	int prot = 0;
 	int ret = -EINVAL;
 
-	if ((amd_iommu_pgtable == AMD_IOMMU_V1) &&
+	if ((domain->pd_mode == PD_MODE_V1) &&
 	    (domain->iop.mode == PAGE_MODE_NONE))
 		return -EINVAL;
 
@@ -2356,7 +2356,7 @@ static size_t amd_iommu_unmap_pages(struct iommu_domain *dom, unsigned long iova
 	struct io_pgtable_ops *ops = &domain->iop.iop.ops;
 	size_t r;
 
-	if ((amd_iommu_pgtable == AMD_IOMMU_V1) &&
+	if ((domain->pd_mode == PD_MODE_V1) &&
 	    (domain->iop.mode == PAGE_MODE_NONE))
 		return 0;