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-rw-r--r--drivers/vfio/vfio_iommu_spapr_tce.c87
1 files changed, 42 insertions, 45 deletions
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index 4efd2b20c35c..a67bbfdd86d5 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -710,6 +710,29 @@ static long tce_iommu_remove_window(struct tce_container *container,
return 0;
}
+static long tce_iommu_create_default_window(struct tce_container *container)
+{
+ long ret;
+ __u64 start_addr = 0;
+ struct tce_iommu_group *tcegrp;
+ struct iommu_table_group *table_group;
+
+ if (!tce_groups_attached(container))
+ return -ENODEV;
+
+ tcegrp = list_first_entry(&container->group_list,
+ struct tce_iommu_group, next);
+ table_group = iommu_group_get_iommudata(tcegrp->grp);
+ if (!table_group)
+ return -ENODEV;
+
+ ret = tce_iommu_create_window(container, IOMMU_PAGE_SHIFT_4K,
+ table_group->tce32_size, 1, &start_addr);
+ WARN_ON_ONCE(!ret && start_addr);
+
+ return ret;
+}
+
static long tce_iommu_ioctl(void *iommu_data,
unsigned int cmd, unsigned long arg)
{
@@ -1100,9 +1123,6 @@ static void tce_iommu_release_ownership_ddw(struct tce_container *container,
static long tce_iommu_take_ownership_ddw(struct tce_container *container,
struct iommu_table_group *table_group)
{
- long i, ret = 0;
- struct iommu_table *tbl = NULL;
-
if (!table_group->ops->create_table || !table_group->ops->set_window ||
!table_group->ops->release_ownership) {
WARN_ON_ONCE(1);
@@ -1111,47 +1131,7 @@ static long tce_iommu_take_ownership_ddw(struct tce_container *container,
table_group->ops->take_ownership(table_group);
- /*
- * If it the first group attached, check if there is
- * a default DMA window and create one if none as
- * the userspace expects it to exist.
- */
- if (!tce_groups_attached(container) && !container->tables[0]) {
- ret = tce_iommu_create_table(container,
- table_group,
- 0, /* window number */
- IOMMU_PAGE_SHIFT_4K,
- table_group->tce32_size,
- 1, /* default levels */
- &tbl);
- if (ret)
- goto release_exit;
- else
- container->tables[0] = tbl;
- }
-
- /* Set all windows to the new group */
- for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
- tbl = container->tables[i];
-
- if (!tbl)
- continue;
-
- /* Set the default window to a new group */
- ret = table_group->ops->set_window(table_group, i, tbl);
- if (ret)
- goto release_exit;
- }
-
return 0;
-
-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;
}
static int tce_iommu_attach_group(void *iommu_data,
@@ -1161,6 +1141,7 @@ static int tce_iommu_attach_group(void *iommu_data,
struct tce_container *container = iommu_data;
struct iommu_table_group *table_group;
struct tce_iommu_group *tcegrp = NULL;
+ bool create_default_window = false;
mutex_lock(&container->lock);
@@ -1203,14 +1184,30 @@ static int tce_iommu_attach_group(void *iommu_data,
}
if (!table_group->ops || !table_group->ops->take_ownership ||
- !table_group->ops->release_ownership)
+ !table_group->ops->release_ownership) {
ret = tce_iommu_take_ownership(container, table_group);
- else
+ } else {
ret = tce_iommu_take_ownership_ddw(container, table_group);
+ if (!tce_groups_attached(container) && !container->tables[0])
+ create_default_window = true;
+ }
if (!ret) {
tcegrp->grp = iommu_group;
list_add(&tcegrp->next, &container->group_list);
+ /*
+ * If it the first group attached, check if there is
+ * a default DMA window and create one if none as
+ * the userspace expects it to exist.
+ */
+ if (create_default_window) {
+ ret = tce_iommu_create_default_window(container);
+ if (ret) {
+ list_del(&tcegrp->next);
+ tce_iommu_release_ownership_ddw(container,
+ table_group);
+ }
+ }
}
unlock_exit: