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- /* 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
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