projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9476df7d DW |
1 | #ifndef _LINUX_MEMREMAP_H_ |
| 2 | #define _LINUX_MEMREMAP_H_ | |
| 3 | #include <linux/mm.h> | |
| 4 | ||
| 5 | struct resource; | |
| 6 | struct device; | |
| 4b94ffdc DW |
7 | |
| 8 | /** | |
| 9 | * struct vmem_altmap - pre-allocated storage for vmemmap_populate | |
| 10 | * @base_pfn: base of the entire dev_pagemap mapping | |
| 11 | * @reserve: pages mapped, but reserved for driver use (relative to @base) | |
| 12 | * @free: free pages set aside in the mapping for memmap storage | |
| 13 | * @align: pages reserved to meet allocation alignments | |
| 14 | * @alloc: track pages consumed, private to vmemmap_populate() | |
| 15 | */ | |
| 16 | struct vmem_altmap { | |
| 17 | const unsigned long base_pfn; | |
| 18 | const unsigned long reserve; | |
| 19 | unsigned long free; | |
| 20 | unsigned long align; | |
| 21 | unsigned long alloc; | |
| 22 | }; | |
| 23 | ||
| 24 | unsigned long vmem_altmap_offset(struct vmem_altmap *altmap); | |
| 25 | void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns); | |
| 26 | ||
| 27 | #if defined(CONFIG_SPARSEMEM_VMEMMAP) && defined(CONFIG_ZONE_DEVICE) | |
| 28 | struct vmem_altmap *to_vmem_altmap(unsigned long memmap_start); | |
| 29 | #else | |
| 30 | static inline struct vmem_altmap *to_vmem_altmap(unsigned long memmap_start) | |
| 31 | { | |
| 32 | return NULL; | |
| 33 | } | |
| 34 | #endif | |
| 35 | ||
| 9476df7d DW |
36 | /** |
| 37 | * struct dev_pagemap - metadata for ZONE_DEVICE mappings | |
| 4b94ffdc | 38 | * @altmap: pre-allocated/reserved memory for vmemmap allocations |
| 9476df7d DW |
39 | * @dev: host device of the mapping for debug |
| 40 | */ | |
| 41 | struct dev_pagemap { | |
| 4b94ffdc DW |
42 | struct vmem_altmap *altmap; |
| 43 | const struct resource *res; | |
| 9476df7d DW |
44 | struct device *dev; |
| 45 | }; | |
| 46 | ||
| 47 | #ifdef CONFIG_ZONE_DEVICE | |
| 4b94ffdc DW |
48 | void *devm_memremap_pages(struct device *dev, struct resource *res, |
| 49 | struct vmem_altmap *altmap); | |
| 9476df7d DW |
50 | struct dev_pagemap *find_dev_pagemap(resource_size_t phys); |
| 51 | #else | |
| 52 | static inline void *devm_memremap_pages(struct device *dev, | |
| 4b94ffdc | 53 | struct resource *res, struct vmem_altmap *altmap) |
| 9476df7d DW |
54 | { |
| 55 | /* | |
| 56 | * Fail attempts to call devm_memremap_pages() without | |
| 57 | * ZONE_DEVICE support enabled, this requires callers to fall | |
| 58 | * back to plain devm_memremap() based on config | |
| 59 | */ | |
| 60 | WARN_ON_ONCE(1); | |
| 61 | return ERR_PTR(-ENXIO); | |
| 62 | } | |
| 63 | ||
| 64 | static inline struct dev_pagemap *find_dev_pagemap(resource_size_t phys) | |
| 65 | { | |
| 66 | return NULL; | |
| 67 | } | |
| 68 | #endif | |
| 9476df7d | 69 | #endif /* _LINUX_MEMREMAP_H_ */ |