This patch adds a reserved iova_domain to the vfio_domain struct.
This iova domain will enable to allocate iova within the reserved
iova region.
alloc_reserved_iova_domain makes possible to allocate and initialize
this iova domain. The user will be introduced in subsequent patches.
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
drivers/vfio/vfio_iommu_type1.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 33a9ce4..33304c0 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -36,6 +36,7 @@
#include <linux/uaccess.h>
#include <linux/vfio.h>
#include <linux/workqueue.h>
+#include <linux/iova.h>
#define DRIVER_VERSION "0.2"
#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@xxxxxxxxxx>"
@@ -77,6 +78,7 @@ struct vfio_domain {
struct list_head group_list;
/* rb tree indexed by PA, for reserved bindings only */
struct rb_root reserved_binding_list;
+ struct iova_domain *reserved_iova_domain;
int prot; /* IOMMU_CACHE */
bool fgsp; /* Fine-grained super pages */
};
@@ -178,6 +180,41 @@ static struct vfio_dma *vfio_find_dma(struct vfio_iommu *iommu,
return NULL;
}
+/* alloc_reserved_iova_domain: allocate an iova domain used to manage
+ * reserved iova
+ * @iova: base iova of the domain
+ * @size: size of the domain
+ * @order: iommu page size order
+ */
+static int alloc_reserved_iova_domain(struct vfio_domain *domain,
+ dma_addr_t iova, size_t size,
+ unsigned long order)
+{
+ unsigned long granule, mask;
+ int ret = 0;
+
+ granule = 1UL << order;
+ mask = granule - 1;
+ if (iova & mask)
+ return -EINVAL;
+ if ((!size) || (size & mask))
+ return -EINVAL;
+
+ domain->reserved_iova_domain =
+ kzalloc(sizeof(struct iova_domain), GFP_KERNEL);
+ if (!domain->reserved_iova_domain) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+ init_iova_domain(domain->reserved_iova_domain,
+ granule, iova >> order, (iova + size - 1) >> order);
+ return ret;
+
+out_free:
+ kfree(domain->reserved_iova_domain);
+ return ret;
+}
+
static void vfio_link_dma(struct vfio_iommu *iommu, struct vfio_dma *new)
{
struct rb_node **link = &iommu->dma_list.rb_node, *parent = NULL;
--
1.9.1
--
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