This patch registers the ITS global doorbell. Registered information
are needed to set up the KVM passthrough use case.

Signed-off-by: Eric Auger <eric.au...@redhat.com>

---
v13 -> v14:
- use iommu_msi_doorbell_alloc/free

v12 -> v13:
- use new doorbell registration prototype

v11 -> v12:
- use new irq_get_msi_doorbell_info name
- simplify error handling

v10 -> v11:
- adapt to new doorbell registration API and implement msi_doorbell_info
---
 drivers/irqchip/irq-gic-v3-its.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 98ff669..b42e006 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -86,6 +86,7 @@ struct its_node {
        u32                     ite_size;
        u32                     device_ids;
        int                     numa_node;
+       struct iommu_msi_doorbell_info  *doorbell_info;
 };
 
 #define ITS_ITT_ALIGN          SZ_256
@@ -1717,6 +1718,7 @@ static int __init its_probe(struct device_node *node,
 
        if (of_property_read_bool(node, "msi-controller")) {
                struct msi_domain_info *info;
+               phys_addr_t translater;
 
                info = kzalloc(sizeof(*info), GFP_KERNEL);
                if (!info) {
@@ -1724,10 +1726,21 @@ static int __init its_probe(struct device_node *node,
                        goto out_free_tables;
                }
 
+               translater = its->phys_base + GITS_TRANSLATER;
+               its->doorbell_info =
+                       iommu_msi_doorbell_alloc(translater, sizeof(u32), true);
+
+               if (IS_ERR(its->doorbell_info))  {
+                       kfree(info);
+                       goto out_free_tables;
+               }
+
+
                inner_domain = irq_domain_add_tree(node, &its_domain_ops, its);
                if (!inner_domain) {
                        err = -ENOMEM;
                        kfree(info);
+                       iommu_msi_doorbell_free(its->doorbell_info);
                        goto out_free_tables;
                }
 
-- 
1.9.1

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