[patch V2 18/36] genirq/msi: Add msi_device_data::properties

[Thomas Gleixner]

Add a properties field which allows core code to store information for easy
retrieval in order to replace MSI descriptor fiddling.

Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
---
V2: Add a setter function to prepare for future changes
---
 include/linux/msi.h |   17 +++++++++++++++++
 kernel/irq/msi.c    |   24 ++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -4,6 +4,7 @@
 
 #include <linux/cpumask.h>
 #include <linux/list.h>
+#include <linux/bits.h>
 #include <asm/msi.h>
 
 /* Dummy shadow structures if an architecture does not define them */
@@ -153,6 +154,22 @@ struct msi_device_data {
 
 int msi_setup_device_data(struct device *dev);
 
+/* MSI device properties */
+#define MSI_PROP_PCI_MSI		BIT(0)
+#define MSI_PROP_PCI_MSIX		BIT(1)
+#define MSI_PROP_64BIT			BIT(2)
+
+#ifdef CONFIG_GENERIC_MSI_IRQ
+bool msi_device_has_property(struct device *dev, unsigned long prop);
+void msi_device_set_properties(struct device *dev, unsigned long prop);
+#else
+static inline bool msi_device_has_property(struct device *dev, unsigned long prop)
+{
+	return false;
+}
+static inline void msi_device_set_properties(struct device *dev, unsigned long prop) { }
+#endif
+
 /* Helpers to hide struct msi_desc implementation details */
 #define msi_desc_to_dev(desc)		((desc)->dev)
 #define dev_to_msi_list(dev)		(&(dev)->msi_list)
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -60,6 +60,30 @@ void free_msi_entry(struct msi_desc *ent
 	kfree(entry);
 }
 
+/**
+ * msi_device_set_properties - Set device specific MSI properties
+ * @dev:	Pointer to the device which is queried
+ * @prop:	Properties to set
+ */
+void msi_device_set_properties(struct device *dev, unsigned long prop)
+{
+	if (WARN_ON_ONCE(!dev->msi.data))
+		return ;
+	dev->msi.data->properties = 0;
+}
+
+/**
+ * msi_device_has_property - Check whether a device has a specific MSI property
+ * @dev:	Pointer to the device which is queried
+ * @prop:	Property to check for
+ */
+bool msi_device_has_property(struct device *dev, unsigned long prop)
+{
+	if (!dev->msi.data)
+		return false;
+	return !!(dev->msi.data->properties & prop);
+}
+
 void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
 {
 	*msg = entry->msg;