iommu: Add DOMAIN_ATTR_WINDOWS domain attribute
This attribute can be used to set and get the number of
subwindows on IOMMUs that are window-based.
Signed-off-by: Joerg Roedel <joro@8bytes.org>
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index b3aced7..b972d43 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -891,6 +891,7 @@
struct iommu_domain_geometry *geometry;
bool *paging;
int ret = 0;
+ u32 *count;
switch (attr) {
case DOMAIN_ATTR_GEOMETRY:
@@ -902,6 +903,15 @@
paging = data;
*paging = (domain->ops->pgsize_bitmap != 0UL);
break;
+ case DOMAIN_ATTR_WINDOWS:
+ count = data;
+
+ if (domain->ops->domain_get_windows != NULL)
+ *count = domain->ops->domain_get_windows(domain);
+ else
+ ret = -ENODEV;
+
+ break;
default:
if (!domain->ops->domain_get_attr)
return -EINVAL;
@@ -916,9 +926,26 @@
int iommu_domain_set_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
- if (!domain->ops->domain_set_attr)
- return -EINVAL;
+ int ret = 0;
+ u32 *count;
- return domain->ops->domain_set_attr(domain, attr, data);
+ switch (attr) {
+ case DOMAIN_ATTR_WINDOWS:
+ count = data;
+
+ if (domain->ops->domain_set_windows != NULL)
+ ret = domain->ops->domain_set_windows(domain, *count);
+ else
+ ret = -ENODEV;
+
+ break;
+ default:
+ if (domain->ops->domain_set_attr == NULL)
+ return -EINVAL;
+
+ ret = domain->ops->domain_set_attr(domain, attr, data);
+ }
+
+ return ret;
}
EXPORT_SYMBOL_GPL(iommu_domain_set_attr);
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 5ea3d72..ba3b8a9 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -60,6 +60,7 @@
enum iommu_attr {
DOMAIN_ATTR_GEOMETRY,
DOMAIN_ATTR_PAGING,
+ DOMAIN_ATTR_WINDOWS,
DOMAIN_ATTR_MAX,
};
@@ -106,6 +107,10 @@
int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
phys_addr_t paddr, u64 size);
void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
+ /* Set the numer of window per domain */
+ int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
+ /* Get the numer of window per domain */
+ u32 (*domain_get_windows)(struct iommu_domain *domain);
unsigned long pgsize_bitmap;
};