mm/cma.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __MM_CMA_H__
   3 #define __MM_CMA_H__
   4
   5 #include <linux/debugfs.h>
   6
   7 #define CMA_MAX_NAME 64
   8
   9 struct cma {
  10         unsigned long   base_pfn;
  11         unsigned long   count;
  12         unsigned long   *bitmap;
  13         unsigned int order_per_bit; /* Order of pages represented by one bit */
  14         struct mutex    lock;
  15 #ifdef CONFIG_CMA_DEBUGFS
  16         struct hlist_head mem_head;
  17         spinlock_t mem_head_lock;
  18         struct debugfs_u32_array dfs_bitmap;
  19 #endif
  20         char name[CMA_MAX_NAME];
  21 };
  22
  23 extern struct cma cma_areas[MAX_CMA_AREAS];
  24 extern unsigned cma_area_count;
  25
  26 static inline unsigned long cma_bitmap_maxno(struct cma *cma)
  27 {
  28         return cma->count >> cma->order_per_bit;
  29 }
  30
  31 #endif