@@ -354,3 +354,21 @@ struct irq_domain *acpi_irq_create_hierarchy(unsigned int flags,
host_data);
}
EXPORT_SYMBOL_GPL(acpi_irq_create_hierarchy);
+
+int acpi_get_gsi_parent_fwnode(acpi_handle handle,
+ unsigned int index,
+ struct fwnode_handle **parent)
+{
+ struct irq_fwspec fwspec;
+ unsigned long flags;
+ int rc;
+
+ fwspec.fwnode = NULL;
+ rc = acpi_irq_parse_one(handle, index, &fwspec, &flags);
+ if (rc || !fwspec.fwnode)
+ return 0;
+
+ *parent = fwspec.fwnode;
+ return 1;
+}
+EXPORT_SYMBOL_GPL(acpi_get_gsi_parent_fwnode);
@@ -1572,6 +1572,25 @@ static int acpi_fwnode_irq_get(const struct fwnode_handle *fwnode,
return res.start;
}
+static int acpi_fwnode_add_links(struct fwnode_handle *fwnode)
+{
+ struct fwnode_handle *parent_fwnode;
+ unsigned int i;
+
+ /* This is needed primarily for RISC-V. Other architectures can
+ * be enabled or made this generic if required.
+ */
+ if (!IS_ENABLED(CONFIG_RISCV))
+ return 0;
+
+ for (i = 0;
+ acpi_get_gsi_parent_fwnode(ACPI_HANDLE_FWNODE(fwnode), i, &parent_fwnode);
+ i++)
+ fwnode_link_add(fwnode, parent_fwnode);
+
+ return 0;
+}
+
#define DECLARE_ACPI_FWNODE_OPS(ops) \
const struct fwnode_operations ops = { \
.device_is_available = acpi_fwnode_device_is_available, \
@@ -1597,6 +1616,7 @@ static int acpi_fwnode_irq_get(const struct fwnode_handle *fwnode,
.graph_get_port_parent = acpi_fwnode_get_parent, \
.graph_parse_endpoint = acpi_fwnode_graph_parse_endpoint, \
.irq_get = acpi_fwnode_irq_get, \
+ .add_links = acpi_fwnode_add_links, \
}; \
EXPORT_SYMBOL_GPL(ops)
@@ -1463,12 +1463,21 @@ static inline int acpi_parse_spcr(bool enable_earlycon, bool enable_console)
#if IS_ENABLED(CONFIG_ACPI_GENERIC_GSI)
int acpi_irq_get(acpi_handle handle, unsigned int index, struct resource *res);
+int acpi_get_gsi_parent_fwnode(acpi_handle handle, unsigned int index,
+ struct fwnode_handle **parent);
#else
static inline
int acpi_irq_get(acpi_handle handle, unsigned int index, struct resource *res)
{
return -EINVAL;
}
+
+static inline
+int acpi_get_gsi_parent_fwnode(acpi_handle handle, unsigned int index,
+ struct fwnode_handle **parent)
+{
+ return 0;
+}
#endif
#ifdef CONFIG_ACPI_LPIT
Currently ACPI doesn't support fw_devlink infrastructure which helps in ordering the driver probe in the order of dependencies. One of the dependency between devices in ACPI is GSI interrupt source. This interrupt source can be another device and mentioned as part of ResourceSource in the ASL. Or it can be indirectly determined by the GSI mapping. In either way, adding the link for this dependency avoids modifying all drivers to handle EPROBE_DEFER. So, add this new interface into ACPI's fwnode handlers. Currently, this is necessary for RISC-V architecture. So, kept the interface functional only for RISC-V. But in future other architectures also can enable this functionality or can be made common. Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> --- drivers/acpi/irq.c | 18 ++++++++++++++++++ drivers/acpi/property.c | 20 ++++++++++++++++++++ include/linux/acpi.h | 9 +++++++++ 3 files changed, 47 insertions(+)