[patch 03/20] genirq/msi: Create msi_api.h

Thomas Gleixner
2022-11-11T14:01:01Z

Create a API header for MSI specific functions which are relevant to device
drivers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/msi.h | 6 ++++--
include/linux/msi_api.h | 15 +++++++++++++++
2 files changed, 19 insertions(+), 2 deletions(-)

--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -13,11 +13,14 @@
*
* Regular device drivers have no business with any of these functions and
* especially storing MSI descriptor pointers in random code is considered
- * abuse. The only function which is relevant for drivers is msi_get_virq().
+ * abuse.
+ *
+ * Device driver relevant functions are available in <linux/msi_api.h>
*/

#include <linux/irqdomain_defs.h>
#include <linux/cpumask.h>
+#include <linux/msi_api.h>
#include <linux/xarray.h>
#include <linux/mutex.h>
#include <linux/list.h>
@@ -184,7 +187,6 @@ struct msi_device_data {

int msi_setup_device_data(struct device *dev);

-unsigned int msi_get_virq(struct device *dev, unsigned int index);
void msi_lock_descs(struct device *dev);
void msi_unlock_descs(struct device *dev);

--- /dev/null
+++ b/include/linux/msi_api.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef LINUX_MSI_API_H
+#define LINUX_MSI_API_H
+
+/*
+ * APIs which are relevant for device driver code for allocating and
+ * freeing MSI interrupts and querying the associations between
+ * hardware/software MSI indices and the Linux interrupt number.
+ */
+
+struct device;
+
+unsigned int msi_get_virq(struct device *dev, unsigned int index);
+
+#endif