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 #include <linux/kobject.h>
   7
   8 struct cma_kobject {
   9         struct kobject kobj;
  10         struct cma *cma;
  11 };
  12
  13 struct cma {
  14         unsigned long   base_pfn;
  15         unsigned long   count;
  16         unsigned long   *bitmap;
  17         unsigned int order_per_bit; /* Order of pages represented by one bit */
  18         spinlock_t      lock;
  19 #ifdef CONFIG_CMA_DEBUGFS
  20         struct hlist_head mem_head;
  21         spinlock_t mem_head_lock;
  22         struct debugfs_u32_array dfs_bitmap;
  23 #endif
  24         char name[CMA_MAX_NAME];
  25 #ifdef CONFIG_CMA_SYSFS
  26         /* the number of CMA page successful allocations */
  27         atomic64_t nr_pages_succeeded;
  28         /* the number of CMA page allocation failures */
  29         atomic64_t nr_pages_failed;
  30         /* the number of CMA page released */
  31         atomic64_t nr_pages_released;
  32         /* kobject requires dynamic object */
  33         struct cma_kobject *cma_kobj;
  34 #endif
  35         bool reserve_pages_on_error;
  36 };
  37
  38 extern struct cma cma_areas[MAX_CMA_AREAS];
  39 extern unsigned cma_area_count;
  40
  41 static inline unsigned long cma_bitmap_maxno(struct cma *cma)
  42 {
  43         return cma->count >> cma->order_per_bit;
  44 }
  45
  46 #ifdef CONFIG_CMA_SYSFS
  47 void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages);
  48 void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages);
  49 void cma_sysfs_account_release_pages(struct cma *cma, unsigned long nr_pages);
  50 #else
  51 static inline void cma_sysfs_account_success_pages(struct cma *cma,
  52                                                    unsigned long nr_pages) {};
  53 static inline void cma_sysfs_account_fail_pages(struct cma *cma,
  54                                                 unsigned long nr_pages) {};
  55 static inline void cma_sysfs_account_release_pages(struct cma *cma,
  56                                                    unsigned long nr_pages) {};
  57 #endif
  58 #endif