[RFC PATCH 3/3]irqchip/gicv3-its: Add a new flag to control indirect route in ACPI mode.

Majun
2016-12-01T07:46:58Z

From: MaJun <majun258@huawei.com>

Add a new flag to control indirect route function for ACPI mode.
To carry the user defined flags information, we used the reserved byte
in ITS MADT table

Signed-off-by: MaJun <majun258@huawei.com>
---
drivers/irqchip/irq-gic-v3-its.c | 5 ++++-
include/acpi/actbl1.h | 3 ++-
2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index ee54133..4420283 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1848,6 +1848,7 @@ static int __init gic_acpi_parse_madt_its(struct acpi_subtable_header *header,
struct fwnode_handle *dom_handle;
struct resource res;
int err;
+ u8 flags = 0;

its_entry = (struct acpi_madt_generic_translator *)header;
memset(&res, 0, sizeof(res));
@@ -1855,6 +1856,8 @@ static int __init gic_acpi_parse_madt_its(struct acpi_subtable_header *header,
res.end = its_entry->base_address + ACPI_GICV3_ITS_MEM_SIZE - 1;
res.flags = IORESOURCE_MEM;

+ flags = its_entry->flags;
+
dom_handle = irq_domain_alloc_fwnode((void *)its_entry->base_address);
if (!dom_handle) {
pr_err("ITS@%pa: Unable to allocate GICv3 ITS domain token\n",
@@ -1869,7 +1872,7 @@ static int __init gic_acpi_parse_madt_its(struct acpi_subtable_header *header,
goto dom_err;
}

- err = its_probe_one(&res, dom_handle, NUMA_NO_NODE, 0);
+ err = its_probe_one(&res, dom_handle, NUMA_NO_NODE, flags);
if (!err)
return 0;

diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 796d6ba..42a08ae 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -930,7 +930,8 @@ struct acpi_madt_generic_translator {
u16 reserved; /* reserved - must be zero */
u32 translation_id;
u64 base_address;
- u32 reserved2;
+ u8 flags;
+ u8 reserved2[3];
};

/*
--
1.7.12.4