1 files changed, 110 insertions, 0 deletions
diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h
new file mode 100644
index 000000000..afcada6fd
--- /dev/null
+++ b/drivers/dax/dax-private.h
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright(c) 2016 Intel Corporation. All rights reserved.
+ */
+#ifndef __DAX_PRIVATE_H__
+#define __DAX_PRIVATE_H__
+
+#include <linux/device.h>
+#include <linux/cdev.h>
+#include <linux/idr.h>
+
+/* private routines between core files */
+struct dax_device;
+struct dax_device *inode_dax(struct inode *inode);
+struct inode *dax_inode(struct dax_device *dax_dev);
+int dax_bus_init(void);
+void dax_bus_exit(void);
+
+/**
+ * struct dax_region - mapping infrastructure for dax devices
+ * @id: kernel-wide unique region for a memory range
+ * @target_node: effective numa node if this memory range is onlined
+ * @kref: to pin while other agents have a need to do lookups
+ * @dev: parent device backing this region
+ * @align: allocation and mapping alignment for child dax devices
+ * @ida: instance id allocator
+ * @res: resource tree to track instance allocations
+ * @seed: allow userspace to find the first unbound seed device
+ * @youngest: allow userspace to find the most recently created device
+ */
+struct dax_region {
+	int id;
+	int target_node;
+	struct kref kref;
+	struct device *dev;
+	unsigned int align;
+	struct ida ida;
+	struct resource res;
+	struct device *seed;
+	struct device *youngest;
+};
+
+struct dax_mapping {
+	struct device dev;
+	int range_id;
+	int id;
+};
+
+/**
+ * struct dev_dax - instance data for a subdivision of a dax region, and
+ * data while the device is activated in the driver.
+ * @region - parent region
+ * @dax_dev - core dax functionality
+ * @target_node: effective numa node if dev_dax memory range is onlined
+ * @dyn_id: is this a dynamic or statically created instance
+ * @id: ida allocated id when the dax_region is not static
+ * @ida: mapping id allocator
+ * @dev - device core
+ * @pgmap - pgmap for memmap setup / lifetime (driver owned)
+ * @nr_range: size of @ranges
+ * @ranges: resource-span + pgoff tuples for the instance
+ */
+struct dev_dax {
+	struct dax_region *region;
+	struct dax_device *dax_dev;
+	unsigned int align;
+	int target_node;
+	bool dyn_id;
+	int id;
+	struct ida ida;
+	struct device dev;
+	struct dev_pagemap *pgmap;
+	int nr_range;
+	struct dev_dax_range {
+		unsigned long pgoff;
+		struct range range;
+		struct dax_mapping *mapping;
+	} *ranges;
+};
+
+static inline struct dev_dax *to_dev_dax(struct device *dev)
+{
+	return container_of(dev, struct dev_dax, dev);
+}
+
+static inline struct dax_mapping *to_dax_mapping(struct device *dev)
+{
+	return container_of(dev, struct dax_mapping, dev);
+}
+
+phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff, unsigned long size);
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+static inline bool dax_align_valid(unsigned long align)
+{
+	if (align == PUD_SIZE && IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD))
+		return true;
+	if (align == PMD_SIZE && has_transparent_hugepage())
+		return true;
+	if (align == PAGE_SIZE)
+		return true;
+	return false;
+}
+#else
+static inline bool dax_align_valid(unsigned long align)
+{
+	return align == PAGE_SIZE;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif