[PATCH v11 6/7] ACPI/IORT: Stub out ACS functions when CONFIG_PCI is not set

Sinan Kaya
2018-12-18T02:56:27Z

Remove PCI dependent code out of iort.c when CONFIG_PCI is not defined.
A quick search reveals the following functions:
1. pci_request_acs()
2. pci_domain_nr()
3. pci_is_root_bus()
4. to_pci_dev()

Both pci_domain_nr() and pci_is_root_bus() are defined in linux/pci.h.
pci_domain_nr() is a stub function when CONFIG_PCI is not set and
pci_is_root_bus() just returns a reference to a structure member which
is still valid without CONFIG_PCI set.

to_pci_dev() is a macro that expands to container_of.

pci_request_acs() is the only code that gets pulled in from drivers/pci/*.c

Signed-off-by: Sinan Kaya <okaya@kernel.org>
---
drivers/acpi/arm64/iort.c | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 70f4e80b9246..beb7e4c05bf5 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -1435,8 +1435,14 @@ static int __init iort_add_platform_device(struct acpi_iort_node *node,
return ret;
}

-static bool __init iort_enable_acs(struct acpi_iort_node *iort_node)
+#ifdef CONFIG_PCI
+static void __init iort_enable_acs(struct acpi_iort_node *iort_node)
{
+ static bool acs_enabled __initdata;
+
+ if (acs_enabled)
+ return;
+
if (iort_node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
struct acpi_iort_node *parent;
struct acpi_iort_id_mapping *map;
@@ -1458,13 +1464,16 @@ static bool __init iort_enable_acs(struct acpi_iort_node *iort_node)
if ((parent->type == ACPI_IORT_NODE_SMMU) ||
(parent->type == ACPI_IORT_NODE_SMMU_V3)) {
pci_request_acs();
- return true;
+ acs_enabled = true;
+ return;
}
}
}
-
- return false;
+ return;
}
+#else
+static inline void iort_enable_acs(struct acpi_iort_node *iort_node) { }
+#endif

static void __init iort_init_platform_devices(void)
{
@@ -1472,7 +1481,6 @@ static void __init iort_init_platform_devices(void)
struct acpi_table_iort *iort;
struct fwnode_handle *fwnode;
int i, ret;
- bool acs_enabled = false;
const struct iort_dev_config *ops;

/*
@@ -1493,8 +1501,7 @@ static void __init iort_init_platform_devices(void)
return;
}

- if (!acs_enabled)
- acs_enabled = iort_enable_acs(iort_node);
+ iort_enable_acs(iort_node);

ops = iort_get_dev_cfg(iort_node);
if (ops) {
--
2.19.0