drivers/nvdimm/pmem.h

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