LXR linux/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
   8struct cma_kobject {
   9        struct kobject kobj;
  10        struct cma *cma;
  11};
  12
  13struct 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        /* kobject requires dynamic object */
  31        struct cma_kobject *cma_kobj;
  32#endif
  33};
  34
  35extern struct cma cma_areas[MAX_CMA_AREAS];
  36extern unsigned cma_area_count;
  37
  38static inline unsigned long cma_bitmap_maxno(struct cma *cma)
  39{
  40        return cma->count >> cma->order_per_bit;
  41}
  42
  43#ifdef CONFIG_CMA_SYSFS
  44void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages);
  45void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages);
  46#else
  47static inline void cma_sysfs_account_success_pages(struct cma *cma,
  48                                                   unsigned long nr_pages) {};
  49static inline void cma_sysfs_account_fail_pages(struct cma *cma,
  50                                                unsigned long nr_pages) {};
  51#endif
  52#endif
  53