/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NVDIMM_PMEM_H__
#define __NVDIMM_PMEM_H__
#include <linux/page-flags.h>
#include <linux/badblocks.h>
#include <linux/memremap.h>
#include <linux/types.h>
#include <linux/fs.h>

enum dax_access_mode;

/* this definition is in it's own header for tools/testing/nvdimm to consume */
struct pmem_device {
        /* One contiguous memory region per device */
        phys_addr_t             phys_addr;
        /* when non-zero this device is hosting a 'pfn' instance */
        phys_addr_t             data_offset;
        void                    *virt_addr;
        /* immutable base size of the namespace */
        size_t                  size;
        /* trim size when namespace capacity has been section aligned */
        u32                     pfn_pad;
        struct kernfs_node      *bb_state;
        struct badblocks        bb;
        struct dax_device       *dax_dev;
        struct gendisk          *disk;
        struct dev_pagemap      pgmap;
};

long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
                long nr_pages, enum dax_access_mode mode, void **kaddr,
                unsigned long *pfn);

#ifdef CONFIG_MEMORY_FAILURE
static inline bool test_and_clear_pmem_poison(struct page *page)
{
        return TestClearPageHWPoison(page);
}
#else
static inline bool test_and_clear_pmem_poison(struct page *page)
{
        return false;
}
#endif
#endif /* __NVDIMM_PMEM_H__ */