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
