All drivers are now using IDENTITY or PLATFORM domains for what this did,
we can remove it now. It is no longer possible to attach to a NULL domain.
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
---
drivers/iommu/iommu.c | 30 +++++-------------------------
include/linux/iommu.h | 4 ----
2 files changed, 5 insertions(+), 29 deletions(-)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 8b9af774de68f1..fb646765a87f47 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2192,21 +2192,8 @@ static int __iommu_group_set_domain_internal(struct iommu_group *group,
if (group->domain == new_domain)
return 0;
- /*
- * New drivers should support default domains, so set_platform_dma()
- * op will never be called. Otherwise the NULL domain represents some
- * platform specific behavior.
- */
- if (!new_domain) {
- for_each_group_device(group, gdev) {
- const struct iommu_ops *ops = dev_iommu_ops(gdev->dev);
-
- if (!WARN_ON(!ops->set_platform_dma_ops))
- ops->set_platform_dma_ops(gdev->dev);
- }
- group->domain = NULL;
- return 0;
- }
+ if (WARN_ON(!new_domain))
+ return -EINVAL;
/*
* Changing the domain is done by calling attach_dev() on the new
@@ -2242,19 +2229,15 @@ static int __iommu_group_set_domain_internal(struct iommu_group *group,
*/
last_gdev = gdev;
for_each_group_device(group, gdev) {
- const struct iommu_ops *ops = dev_iommu_ops(gdev->dev);
-
/*
- * If set_platform_dma_ops is not present a NULL domain can
- * happen only for first probe, in which case we leave
- * group->domain as NULL and let release clean everything up.
+ * A NULL domain can happen only for first probe, in which case
+ * we leave group->domain as NULL and let release clean
+ * everything up.
*/
if (group->domain)
WARN_ON(__iommu_device_set_domain(
group, gdev->dev, group->domain,
IOMMU_SET_DOMAIN_MUST_SUCCEED));
- else if (ops->set_platform_dma_ops)
- ops->set_platform_dma_ops(gdev->dev);
if (gdev == last_gdev)
break;
}
@@ -2868,9 +2851,6 @@ static int iommu_setup_default_domain(struct iommu_group *group,
/*
* There are still some drivers which don't support default domains, so
* we ignore the failure and leave group->default_domain NULL.
- *
- * We assume that the iommu driver starts up the device in
- * 'set_platform_dma_ops' mode if it does not support default domains.
*/
dom = iommu_group_alloc_default_domain(group, req_type);
if (!dom) {
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 427490b5736d40..f6a28ab78e607e 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -231,9 +231,6 @@ struct iommu_iotlb_gather {
* @release_device: Remove device from iommu driver handling
* @probe_finalize: Do final setup work after the device is added to an IOMMU
* group and attached to the groups domain
- * @set_platform_dma_ops: Returning control back to the platform DMA ops. This op
- * is to support old IOMMU drivers, new drivers should use
- * default domains, and the common IOMMU DMA ops.
* @device_group: find iommu group for a particular device
* @get_resv_regions: Request list of reserved regions for a device
* @of_xlate: add OF master IDs to iommu grouping
@@ -265,7 +262,6 @@ struct iommu_ops {
struct iommu_device *(*probe_device)(struct device *dev);
void (*release_device)(struct device *dev);
void (*probe_finalize)(struct device *dev);
- void (*set_platform_dma_ops)(struct device *dev);
struct iommu_group *(*device_group)(struct device *dev);
/* Request/Free a list of reserved regions for a device */
--
2.40.0
