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#ifndef _LINUX_MEMREMAP_H_
#define _LINUX_MEMREMAP_H_
#include <linux/mm.h>
struct resource;
struct device;
/**
* struct dev_pagemap - metadata for ZONE_DEVICE mappings
* @dev: host device of the mapping for debug
*/
struct dev_pagemap {
/* TODO: vmem_altmap and percpu_ref count */
struct device *dev;
};
#ifdef CONFIG_ZONE_DEVICE
void *devm_memremap_pages(struct device *dev, struct resource *res);
struct dev_pagemap *find_dev_pagemap(resource_size_t phys);
#else
static inline void *devm_memremap_pages(struct device *dev,
struct resource *res)
{
/*
* Fail attempts to call devm_memremap_pages() without
* ZONE_DEVICE support enabled, this requires callers to fall
* back to plain devm_memremap() based on config
*/
WARN_ON_ONCE(1);
return ERR_PTR(-ENXIO);
}
static inline struct dev_pagemap *find_dev_pagemap(resource_size_t phys)
{
return NULL;
}
#endif
#endif /* _LINUX_MEMREMAP_H_ */
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