[PATCH v10 7/9] irqchip/gicv3-its: register the MSI global doorbell

[Eric Auger]

This patch adds the registration of the MSI global doorbell in
gicv3-its driver.

This will allow the msi layer to iommu_map this doorbell when
requested.

Signed-off-by: Eric Auger <eric.auger at redhat.com>
---
 drivers/irqchip/irq-gic-v3-its.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 5eb1f9e..ed9dfce 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -29,6 +29,8 @@
 #include <linux/of_platform.h>
 #include <linux/percpu.h>
 #include <linux/slab.h>
+#include <linux/iommu.h>
+#include <linux/msi-doorbell.h>
 
 #include <linux/irqchip.h>
 #include <linux/irqchip/arm-gic-v3.h>
@@ -1607,6 +1609,7 @@ 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) {
@@ -1614,10 +1617,21 @@ static int __init its_probe(struct device_node *node,
 			goto out_free_tables;
 		}
 
+		translater = its->phys_base + GITS_TRANSLATER;
+		err = msi_doorbell_register_global(its, translater,
+						sizeof(u32),
+						IOMMU_WRITE | IOMMU_MMIO, true);
+		if (err)  {
+			kfree(info);
+			goto out_free_tables;
+		}
+
+
 		inner_domain = irq_domain_add_tree(node, &its_domain_ops, its);
 		if (!inner_domain) {
 			err = -ENOMEM;
 			kfree(info);
+			msi_doorbell_unregister(its);
 			goto out_free_tables;
 		}
 
-- 
1.9.1