1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __NVDIMM_PMEM_H__
 3#define __NVDIMM_PMEM_H__
 4#include <linux/page-flags.h>
 5#include <linux/badblocks.h>
 6#include <linux/types.h>
 7#include <linux/pfn_t.h>
 8#include <linux/fs.h>
 9
10/* this definition is in it's own header for tools/testing/nvdimm to consume */
11struct pmem_device {
12	/* One contiguous memory region per device */
13	phys_addr_t		phys_addr;
14	/* when non-zero this device is hosting a 'pfn' instance */
15	phys_addr_t		data_offset;
16	u64			pfn_flags;
17	void			*virt_addr;
18	/* immutable base size of the namespace */
19	size_t			size;
20	/* trim size when namespace capacity has been section aligned */
21	u32			pfn_pad;
22	struct kernfs_node	*bb_state;
23	struct badblocks	bb;
24	struct dax_device	*dax_dev;
25	struct gendisk		*disk;
26	struct dev_pagemap	pgmap;
27};
28
29long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
30		long nr_pages, void **kaddr, pfn_t *pfn);
31
32#ifdef CONFIG_MEMORY_FAILURE
33static inline bool test_and_clear_pmem_poison(struct page *page)
34{
35	return TestClearPageHWPoison(page);
36}
37#else
38static inline bool test_and_clear_pmem_poison(struct page *page)
39{
40	return false;
41}
42#endif
43#endif /* __NVDIMM_PMEM_H__ */