[PATCH v13 07/15] irqchip/gicv3-its: Register the MSI doorbell

Eric Auger
2016-10-06T08:45:23Z

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.auger-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

---
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 | 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 98ff669..3fc715e 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -30,6 +30,7 @@
#include <linux/of_platform.h>
#include <linux/percpu.h>
#include <linux/slab.h>
+#include <linux/msi-doorbell.h>

#include <linux/irqchip.h>
#include <linux/irqchip/arm-gic-v3.h>
@@ -86,6 +87,7 @@ struct its_node {
u32 ite_size;
u32 device_ids;
int numa_node;
+ struct msi_doorbell_info *doorbell_info;
};

#define ITS_ITT_ALIGN SZ_256
@@ -1717,6 +1719,7 @@ 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 +1727,21 @@ static int __init its_probe(struct device_node *node,
goto out_free_tables;
}

+ translater = its->phys_base + GITS_TRANSLATER;
+ err = msi_doorbell_register_global(translater, sizeof(u32),
+ true, &its->doorbell_info);
+
+ 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_global(its->doorbell_info);
goto out_free_tables;
}

--
1.9.1