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