[PATCH v2 1/4] VFIO: platform: add reset struct and lookup table

[eric.auger@linaro.org (Eric Auger)]

This patch introduces the vfio_platform_reset_combo struct that
stores all the information useful to handle the reset modality:
compat string, name of the reset function, name of the module that
implements the reset function. A lookup table of such structures
is added, currently containing a single sentinel element. A new
type field is added in vfio_platform_device to store what kind of
reset is associated to the device, if any.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
---
 drivers/vfio/platform/vfio_platform_common.c  |  6 ++++++
 drivers/vfio/platform/vfio_platform_private.h | 12 ++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index abcff7a..d970776 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -25,6 +25,12 @@
 
 static DEFINE_MUTEX(driver_lock);
 
+static const struct vfio_platform_reset_combo reset_lookup_table[] = {
+	{
+		.type = VFIO_PLATFORM_RESET_TYPE_MAX
+	},
+};
+
 static int vfio_platform_regions_init(struct vfio_platform_device *vdev)
 {
 	int cnt = 0, i;
diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
index 5d31e04..d864124 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -49,6 +49,10 @@ struct vfio_platform_region {
 	void __iomem		*ioaddr;
 };
 
+enum vfio_platform_reset_type {
+	VFIO_PLATFORM_RESET_TYPE_MAX /* last element */,
+};
+
 struct vfio_platform_device {
 	struct vfio_platform_region	*regions;
 	u32				num_regions;
@@ -56,6 +60,7 @@ struct vfio_platform_device {
 	u32				num_irqs;
 	int				refcnt;
 	struct mutex			igate;
+	enum vfio_platform_reset_type	type;
 
 	/*
 	 * These fields should be filled by the bus specific binder
@@ -69,6 +74,13 @@ struct vfio_platform_device {
 	int	(*get_irq)(struct vfio_platform_device *vdev, int i);
 };
 
+struct vfio_platform_reset_combo {
+	enum vfio_platform_reset_type type;
+	char *compat;
+	char *reset_function_name;
+	char *module_name;
+};
+
 extern int vfio_platform_probe_common(struct vfio_platform_device *vdev,
 				      struct device *dev);
 extern struct vfio_platform_device *vfio_platform_remove_common
-- 
1.9.1