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/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 */
  11 struct 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
  29 long __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
  33 static inline bool test_and_clear_pmem_poison(struct page *page)
  34 {
  35         return TestClearPageHWPoison(page);
  36 }
  37 #else
  38 static inline bool test_and_clear_pmem_poison(struct page *page)
  39 {
  40         return false;
  41 }
  42 #endif
  43 #endif /* __NVDIMM_PMEM_H__ */