| Dan Williams | 9476df7 | 2016-01-15 16:56:19 -0800 | [diff] [blame^] | 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_ */ |