include/linux/memremap.h

   1 #ifndef _LINUX_MEMREMAP_H_
   2 #define _LINUX_MEMREMAP_H_
   3 #include <linux/mm.h>
   4
   5 struct resource;
   6 struct device;
   7 /**
   8  * struct dev_pagemap - metadata for ZONE_DEVICE mappings
   9  * @dev: host device of the mapping for debug
  10  */
  11 struct dev_pagemap {
  12         /* TODO: vmem_altmap and percpu_ref count */
  13         struct device *dev;
  14 };
  15
  16 #ifdef CONFIG_ZONE_DEVICE
  17 void *devm_memremap_pages(struct device *dev, struct resource *res);
  18 struct dev_pagemap *find_dev_pagemap(resource_size_t phys);
  19 #else
  20 static inline void *devm_memremap_pages(struct device *dev,
  21                 struct resource *res)
  22 {
  23         /*
  24          * Fail attempts to call devm_memremap_pages() without
  25          * ZONE_DEVICE support enabled, this requires callers to fall
  26          * back to plain devm_memremap() based on config
  27          */
  28         WARN_ON_ONCE(1);
  29         return ERR_PTR(-ENXIO);
  30 }
  31
  32 static inline struct dev_pagemap *find_dev_pagemap(resource_size_t phys)
  33 {
  34         return NULL;
  35 }
  36 #endif
  37
  38 #endif /* _LINUX_MEMREMAP_H_ */