iommu/amd: Introduce iommu_dev_data.ppr

For AMD IOMMU, the PPR feature is needed to support IO page fault (IOPF).
PPR is enabled per PCI end-point device, and is configured by the PPR bit
in the IOMMU device table entry (i.e DTE[PPR]).

Introducing struct iommu_dev_data.ppr track PPR setting for each device.

Also iommu_dev_data.ppr will be set only when IOMMU supports PPR. Hence
remove redundant feature support check in set_dte_entry().

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Co-developed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Link: https://lore.kernel.org/r/20230921092147.5930-12-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: ssuthiku-amd

drivers/iommu/amd/amd_iommu_types.h

@@ -816,6 +816,7 @@ struct iommu_dev_data {
 	u8 ats_enabled  :1;		  /* ATS state */
 	u8 pri_tlp      :1;		  /* PASID TLB required for
 					     PPR completions */
+	u8 ppr          :1;		  /* Enable device PPR support */
 	bool use_vapic;			  /* Enable device to use vapic mode */
 	bool defer_attach;
 

drivers/iommu/amd/iommu.c

@@ -1638,10 +1638,8 @@ static void set_dte_entry(struct amd_iommu *iommu, u16 devid,
 	if (ats)
 		flags |= DTE_FLAG_IOTLB;
 
-	if (ppr) {
-		if (check_feature(FEATURE_EPHSUP))
-			pte_root |= 1ULL << DEV_ENTRY_PPR;
-	}
+	if (ppr)
+		pte_root |= 1ULL << DEV_ENTRY_PPR;
 
 	if (domain->flags & PD_IOMMUV2_MASK) {
 		u64 gcr3 = iommu_virt_to_phys(domain->gcr3_tbl);
@@ -1734,7 +1732,7 @@ static void do_attach(struct iommu_dev_data *dev_data,
 
 	/* Update device table */
 	set_dte_entry(iommu, dev_data->devid, domain,
-		      ats, dev_data->iommu_v2);
+		      ats, dev_data->ppr);
 	clone_aliases(iommu, dev_data->dev);
 
 	device_flush_dte(dev_data);
@@ -2013,7 +2011,7 @@ static void update_device_table(struct protection_domain *domain)
 		if (!iommu)
 			continue;
 		set_dte_entry(iommu, dev_data->devid, domain,
-			      dev_data->ats_enabled, dev_data->iommu_v2);
+			      dev_data->ats_enabled, dev_data->ppr);
 		clone_aliases(iommu, dev_data->dev);
 	}
 }