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-rw-r--r--drivers/dax/bus.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/drivers/dax/bus.h b/drivers/dax/bus.h
new file mode 100644
index 0000000000..1ccd233601
--- /dev/null
+++ b/drivers/dax/bus.h
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
+#ifndef __DAX_BUS_H__
+#define __DAX_BUS_H__
+#include <linux/device.h>
+#include <linux/range.h>
+
+struct dev_dax;
+struct resource;
+struct dax_device;
+struct dax_region;
+
+/* dax bus specific ioresource flags */
+#define IORESOURCE_DAX_STATIC BIT(0)
+#define IORESOURCE_DAX_KMEM BIT(1)
+
+struct dax_region *alloc_dax_region(struct device *parent, int region_id,
+ struct range *range, int target_node, unsigned int align,
+ unsigned long flags);
+
+struct dev_dax_data {
+ struct dax_region *dax_region;
+ struct dev_pagemap *pgmap;
+ resource_size_t size;
+ int id;
+};
+
+struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data);
+
+enum dax_driver_type {
+ DAXDRV_KMEM_TYPE,
+ DAXDRV_DEVICE_TYPE,
+};
+
+struct dax_device_driver {
+ struct device_driver drv;
+ struct list_head ids;
+ enum dax_driver_type type;
+ int (*probe)(struct dev_dax *dev);
+ void (*remove)(struct dev_dax *dev);
+};
+
+int __dax_driver_register(struct dax_device_driver *dax_drv,
+ struct module *module, const char *mod_name);
+#define dax_driver_register(driver) \
+ __dax_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
+void dax_driver_unregister(struct dax_device_driver *dax_drv);
+void kill_dev_dax(struct dev_dax *dev_dax);
+bool static_dev_dax(struct dev_dax *dev_dax);
+
+#define MODULE_ALIAS_DAX_DEVICE(type) \
+ MODULE_ALIAS("dax:t" __stringify(type) "*")
+#define DAX_DEVICE_MODALIAS_FMT "dax:t%d"
+
+#endif /* __DAX_BUS_H__ */