Merge tag 'powerpc-6.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:

 - Add support for building the kernel using PC-relative addressing on
   Power10.

 - Allow HV KVM guests on Power10 to use prefixed instructions.

 - Unify support for the P2020 CPU (85xx) into a single machine
   description.

 - Always build the 64-bit kernel with 128-bit long double.

 - Drop support for several obsolete 2000's era development boards as
   identified by Paul Gortmaker.

 - A series fixing VFIO on Power since some generic changes.

 - Various other small features and fixes.

Thanks to Alexey Kardashevskiy, Andrew Donnellan, Benjamin Gray, Bo Liu,
Christophe Leroy, Dan Carpenter, David Binderman, Ira Weiny, Joel
Stanley, Kajol Jain, Kautuk Consul, Liang He, Luis Chamberlain, Masahiro
Yamada, Michael Neuling, Nathan Chancellor, Nathan Lynch, Nicholas
Miehlbradt, Nicholas Piggin, Nick Desaulniers, Nysal Jan K.A, Pali
Rohár, Paul Gortmaker, Paul Mackerras, Petr Vaněk, Randy Dunlap, Rob
Herring, Sachin Sant, Sean Christopherson, Segher Boessenkool, and
Timothy Pearson.

* tag 'powerpc-6.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (156 commits)
  powerpc/64s: Disable pcrel code model on Clang
  powerpc: Fix merge conflict between pcrel and copy_thread changes
  powerpc/configs/powernv: Add IGB=y
  powerpc/configs/64s: Drop JFS Filesystem
  powerpc/configs/64s: Use EXT4 to mount EXT2 filesystems
  powerpc/configs: Make pseries_defconfig an alias for ppc64le_guest
  powerpc/configs: Make pseries_le an alias for ppc64le_guest
  powerpc/configs: Incorporate generic kvm_guest.config into guest configs
  powerpc/configs: Add IBMVETH=y and IBMVNIC=y to guest configs
  powerpc/configs/64s: Enable Device Mapper options
  powerpc/configs/64s: Enable PSTORE
  powerpc/configs/64s: Enable VLAN support
  powerpc/configs/64s: Enable BLK_DEV_NVME
  powerpc/configs/64s: Drop REISERFS
  powerpc/configs/64s: Use SHA512 for module signatures
  powerpc/configs/64s: Enable IO_STRICT_DEVMEM
  powerpc/configs/64s: Enable SCHEDSTATS
  powerpc/configs/64s: Enable DEBUG_VM & other options
  powerpc/configs/64s: Enable EMULATED_STATS
  powerpc/configs/64s: Enable KUNIT and most tests
  ...

1 files changed, 13 insertions, 83 deletions

diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index 60a50ce8701e..a94ec6225d31 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -1190,52 +1190,6 @@ static long tce_iommu_ioctl(void *iommu_data,
 static void tce_iommu_release_ownership(struct tce_container *container,
 		struct iommu_table_group *table_group)
 {
-	int i;
-
-	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
-		struct iommu_table *tbl = container->tables[i];
-
-		if (!tbl)
-			continue;
-
-		tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size);
-		if (tbl->it_map)
-			iommu_release_ownership(tbl);
-
-		container->tables[i] = NULL;
-	}
-}
-
-static int tce_iommu_take_ownership(struct tce_container *container,
-		struct iommu_table_group *table_group)
-{
-	int i, j, rc = 0;
-
-	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
-		struct iommu_table *tbl = table_group->tables[i];
-
-		if (!tbl || !tbl->it_map)
-			continue;
-
-		rc = iommu_take_ownership(tbl);
-		if (rc) {
-			for (j = 0; j < i; ++j)
-				iommu_release_ownership(
-						table_group->tables[j]);
-
-			return rc;
-		}
-	}
-
-	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
-		container->tables[i] = table_group->tables[i];
-
-	return 0;
-}
-
-static void tce_iommu_release_ownership_ddw(struct tce_container *container,
-		struct iommu_table_group *table_group)
-{
 	long i;
 
 	if (!table_group->ops->unset_window) {
@@ -1246,23 +1200,13 @@ static void tce_iommu_release_ownership_ddw(struct tce_container *container,
 	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
 		if (container->tables[i])
 			table_group->ops->unset_window(table_group, i);
-
-	table_group->ops->release_ownership(table_group);
 }
 
-static long tce_iommu_take_ownership_ddw(struct tce_container *container,
+static long tce_iommu_take_ownership(struct tce_container *container,
 		struct iommu_table_group *table_group)
 {
 	long i, ret = 0;
 
-	if (!table_group->ops->create_table || !table_group->ops->set_window ||
-			!table_group->ops->release_ownership) {
-		WARN_ON_ONCE(1);
-		return -EFAULT;
-	}
-
-	table_group->ops->take_ownership(table_group);
-
 	/* Set all windows to the new group */
 	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
 		struct iommu_table *tbl = container->tables[i];
@@ -1281,8 +1225,6 @@ release_exit:
 	for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i)
 		table_group->ops->unset_window(table_group, i);
 
-	table_group->ops->release_ownership(table_group);
-
 	return ret;
 }
 
@@ -1307,9 +1249,14 @@ static int tce_iommu_attach_group(void *iommu_data,
 		goto unlock_exit;
 	}
 
-	if (tce_groups_attached(container) && (!table_group->ops ||
-			!table_group->ops->take_ownership ||
-			!table_group->ops->release_ownership)) {
+	/* v2 requires full support of dynamic DMA windows */
+	if (container->v2 && table_group->max_dynamic_windows_supported == 0) {
+		ret = -EINVAL;
+		goto unlock_exit;
+	}
+
+	/* v1 reuses TCE tables and does not share them among PEs */
+	if (!container->v2 && tce_groups_attached(container)) {
 		ret = -EBUSY;
 		goto unlock_exit;
 	}
@@ -1344,29 +1291,15 @@ static int tce_iommu_attach_group(void *iommu_data,
 		goto unlock_exit;
 	}
 
-	if (!table_group->ops || !table_group->ops->take_ownership ||
-			!table_group->ops->release_ownership) {
-		if (container->v2) {
-			ret = -EPERM;
-			goto free_exit;
-		}
-		ret = tce_iommu_take_ownership(container, table_group);
-	} else {
-		if (!container->v2) {
-			ret = -EPERM;
-			goto free_exit;
-		}
-		ret = tce_iommu_take_ownership_ddw(container, table_group);
-		if (!tce_groups_attached(container) && !container->tables[0])
-			container->def_window_pending = true;
-	}
+	ret = tce_iommu_take_ownership(container, table_group);
+	if (!tce_groups_attached(container) && !container->tables[0])
+		container->def_window_pending = true;
 
 	if (!ret) {
 		tcegrp->grp = iommu_group;
 		list_add(&tcegrp->next, &container->group_list);
 	}
 
-free_exit:
 	if (ret && tcegrp)
 		kfree(tcegrp);
 
@@ -1405,10 +1338,7 @@ static void tce_iommu_detach_group(void *iommu_data,
 	table_group = iommu_group_get_iommudata(iommu_group);
 	BUG_ON(!table_group);
 
-	if (!table_group->ops || !table_group->ops->release_ownership)
-		tce_iommu_release_ownership(container, table_group);
-	else
-		tce_iommu_release_ownership_ddw(container, table_group);
+	tce_iommu_release_ownership(container, table_group);
 
 unlock_exit:
 	mutex_unlock(&container->lock);