Commit 2e60baca authored by Alexey Kardashevskiy's avatar Alexey Kardashevskiy Committed by Greg Kroah-Hartman

vfio/spapr: Add a helper to create default DMA window

[ Upstream commit 6f01cc69 ]

There is already a helper to create a DMA window which does allocate
a table and programs it to the IOMMU group. However
tce_iommu_take_ownership_ddw() did not use it and did these 2 calls
itself to simplify error path.

Since we are going to delay the default window creation till
the default window is accessed/removed or new window is added,
we need a helper to create a default window from all these cases.

This adds tce_iommu_create_default_window(). Since it relies on
a VFIO container to have at least one IOMMU group (for future use),
this changes tce_iommu_attach_group() to add a group to the container
first and then call the new helper.
Signed-off-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Acked-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 080eb135
...@@ -784,6 +784,29 @@ static long tce_iommu_remove_window(struct tce_container *container, ...@@ -784,6 +784,29 @@ static long tce_iommu_remove_window(struct tce_container *container,
return 0; 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, static long tce_iommu_ioctl(void *iommu_data,
unsigned int cmd, unsigned long arg) unsigned int cmd, unsigned long arg)
{ {
...@@ -1199,9 +1222,6 @@ static void tce_iommu_release_ownership_ddw(struct tce_container *container, ...@@ -1199,9 +1222,6 @@ static void tce_iommu_release_ownership_ddw(struct tce_container *container,
static long tce_iommu_take_ownership_ddw(struct tce_container *container, static long tce_iommu_take_ownership_ddw(struct tce_container *container,
struct iommu_table_group *table_group) 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 || if (!table_group->ops->create_table || !table_group->ops->set_window ||
!table_group->ops->release_ownership) { !table_group->ops->release_ownership) {
WARN_ON_ONCE(1); WARN_ON_ONCE(1);
...@@ -1210,47 +1230,7 @@ static long tce_iommu_take_ownership_ddw(struct tce_container *container, ...@@ -1210,47 +1230,7 @@ static long tce_iommu_take_ownership_ddw(struct tce_container *container,
table_group->ops->take_ownership(table_group); 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; 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, static int tce_iommu_attach_group(void *iommu_data,
...@@ -1260,6 +1240,7 @@ static int tce_iommu_attach_group(void *iommu_data, ...@@ -1260,6 +1240,7 @@ static int tce_iommu_attach_group(void *iommu_data,
struct tce_container *container = iommu_data; struct tce_container *container = iommu_data;
struct iommu_table_group *table_group; struct iommu_table_group *table_group;
struct tce_iommu_group *tcegrp = NULL; struct tce_iommu_group *tcegrp = NULL;
bool create_default_window = false;
mutex_lock(&container->lock); mutex_lock(&container->lock);
...@@ -1302,14 +1283,30 @@ static int tce_iommu_attach_group(void *iommu_data, ...@@ -1302,14 +1283,30 @@ static int tce_iommu_attach_group(void *iommu_data,
} }
if (!table_group->ops || !table_group->ops->take_ownership || 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); ret = tce_iommu_take_ownership(container, table_group);
else } else {
ret = tce_iommu_take_ownership_ddw(container, table_group); ret = tce_iommu_take_ownership_ddw(container, table_group);
if (!tce_groups_attached(container) && !container->tables[0])
create_default_window = true;
}
if (!ret) { if (!ret) {
tcegrp->grp = iommu_group; tcegrp->grp = iommu_group;
list_add(&tcegrp->next, &container->group_list); 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: unlock_exit:
......
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