[PATCH RFC v1 04/11] iommu/virtio: Add a io page fault queue

[Vivek Gautam]

Add a io page fault queue to the driver so that it can be used
to redirect faults to the handler.

Signed-off-by: Vivek Gautam <vivek.gau...@arm.com>
---
 drivers/iommu/virtio-iommu.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index fd237cad1ce5..3da5f0807711 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -58,6 +58,7 @@ struct viommu_dev {
        struct list_head                endpoints;
        struct workqueue_struct         *pri_wq;
        struct viommu_dev_pri_work      *pri_work;
+       struct iopf_queue               *iopf_pri;
 
        /* Device configuration */
        struct iommu_domain_geometry    geometry;
@@ -581,6 +582,15 @@ static int viommu_add_pstf(struct viommu_endpoint *vdev, 
void *pstf, size_t len)
        return 0;
 }
 
+static int viommu_init_queues(struct viommu_dev *viommu)
+{
+       viommu->iopf_pri = iopf_queue_alloc(dev_name(viommu->dev));
+       if (!viommu->iopf_pri)
+               return -ENOMEM;
+
+       return 0;
+}
+
 static int viommu_probe_endpoint(struct viommu_dev *viommu, struct device *dev)
 {
        int ret;
@@ -670,6 +680,15 @@ static int viommu_probe_endpoint(struct viommu_dev 
*viommu, struct device *dev)
 
        list_add(&ep->list, &viommu->endpoints);
 
+       ret = viommu_init_queues(viommu);
+       if (ret)
+               goto out_free_eps;
+
+       kfree(probe);
+       return 0;
+
+out_free_eps:
+       kfree(ep);
 out_free:
        kfree(probe);
        return ret;
-- 
2.17.1

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