LXR linux/drivers/nvdimm/pmem.h

   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/memremap.h>
   7#include <linux/types.h>
   8#include <linux/pfn_t.h>
   9#include <linux/fs.h>
  10
  11/* this definition is in it's own header for tools/testing/nvdimm to consume */
  12struct pmem_device {
  13        /* One contiguous memory region per device */
  14        phys_addr_t             phys_addr;
  15        /* when non-zero this device is hosting a 'pfn' instance */
  16        phys_addr_t             data_offset;
  17        u64                     pfn_flags;
  18        void                    *virt_addr;
  19        /* immutable base size of the namespace */
  20        size_t                  size;
  21        /* trim size when namespace capacity has been section aligned */
  22        u32                     pfn_pad;
  23        struct kernfs_node      *bb_state;
  24        struct badblocks        bb;
  25        struct dax_device       *dax_dev;
  26        struct gendisk          *disk;
  27        struct dev_pagemap      pgmap;
  28};
  29
  30long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
  31                long nr_pages, void **kaddr, pfn_t *pfn);
  32
  33#ifdef CONFIG_MEMORY_FAILURE
  34static inline bool test_and_clear_pmem_poison(struct page *page)
  35{
  36        return TestClearPageHWPoison(page);
  37}
  38#else
  39static inline bool test_and_clear_pmem_poison(struct page *page)
  40{
  41        return false;
  42}
  43#endif
  44#endif /* __NVDIMM_PMEM_H__ */
  45