This patch adds the registration of the MSI global doorbell in
gicv3-its driver plus the implementation for irq_chip
msi_doorbell_info ops.
This will allow the msi layer to iommu_map this doorbell when
requested.
Signed-off-by: Eric Auger <eric.au...@redhat.com>
---
v10 -> v11:
- adapt to new doorbell registration API and implement msi_doorbell_info
---
drivers/irqchip/irq-gic-v3-its.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 5eb1f9e..23102e3 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>
@@ -84,6 +86,7 @@ struct its_node {
u32 ite_size;
u32 device_ids;
int numa_node;
+ struct irq_chip_msi_doorbell_info *doorbell_info;
};
#define ITS_ITT_ALIGN SZ_256
@@ -656,6 +659,16 @@ static void its_irq_compose_msi_msg(struct irq_data *d,
struct msi_msg *msg)
msg->data = its_get_event_id(d);
}
+static struct irq_chip_msi_doorbell_info *
+its_msi_doorbell_info(struct irq_data *d)
+{
+ struct its_device *its_dev = irq_data_get_irq_chip_data(d);
+ struct its_node *its = its_dev->its;
+
+ return its->doorbell_info;
+}
+
+
static struct irq_chip its_irq_chip = {
.name = "ITS",
.irq_mask = its_mask_irq,
@@ -663,6 +676,7 @@ static struct irq_chip its_irq_chip = {
.irq_eoi = irq_chip_eoi_parent,
.irq_set_affinity = its_set_affinity,
.irq_compose_msi_msg = its_irq_compose_msi_msg,
+ .msi_doorbell_info = its_msi_doorbell_info,
};
/*
@@ -1607,6 +1621,7 @@ 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 +1629,23 @@ static int __init its_probe(struct device_node *node,
goto out_free_tables;
}
+ translater = its->phys_base + GITS_TRANSLATER;
+ its->doorbell_info =
+ msi_doorbell_register_global(translater, sizeof(u32),
+ IOMMU_WRITE | IOMMU_MMIO,
+ true);
+
+ if (IS_ERR_OR_NULL(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);
+ msi_doorbell_unregister_global(its->doorbell_info);
goto out_free_tables;
}
--
1.9.1
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