| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __LINUX_IOASID_H |
| #define __LINUX_IOASID_H |
| |
| #include <linux/types.h> |
| #include <linux/errno.h> |
| |
| #define INVALID_IOASID ((ioasid_t)-1) |
| typedef unsigned int ioasid_t; |
| typedef ioasid_t (*ioasid_alloc_fn_t)(ioasid_t min, ioasid_t max, void *data); |
| typedef void (*ioasid_free_fn_t)(ioasid_t ioasid, void *data); |
| |
| struct ioasid_set { |
| int dummy; |
| }; |
| |
| /** |
| * struct ioasid_allocator_ops - IOASID allocator helper functions and data |
| * |
| * @alloc: helper function to allocate IOASID |
| * @free: helper function to free IOASID |
| * @list: for tracking ops that share helper functions but not data |
| * @pdata: data belong to the allocator, provided when calling alloc() |
| */ |
| struct ioasid_allocator_ops { |
| ioasid_alloc_fn_t alloc; |
| ioasid_free_fn_t free; |
| struct list_head list; |
| void *pdata; |
| }; |
| |
| #define DECLARE_IOASID_SET(name) struct ioasid_set name = { 0 } |
| |
| #if IS_ENABLED(CONFIG_IOASID) |
| ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min, ioasid_t max, |
| void *private); |
| void ioasid_get(ioasid_t ioasid); |
| bool ioasid_put(ioasid_t ioasid); |
| void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid, |
| bool (*getter)(void *)); |
| int ioasid_register_allocator(struct ioasid_allocator_ops *allocator); |
| void ioasid_unregister_allocator(struct ioasid_allocator_ops *allocator); |
| int ioasid_set_data(ioasid_t ioasid, void *data); |
| |
| #else /* !CONFIG_IOASID */ |
| static inline ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min, |
| ioasid_t max, void *private) |
| { |
| return INVALID_IOASID; |
| } |
| |
| static inline void ioasid_get(ioasid_t ioasid) |
| { |
| } |
| |
| static inline bool ioasid_put(ioasid_t ioasid) |
| { |
| return false; |
| } |
| |
| static inline void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid, |
| bool (*getter)(void *)) |
| { |
| return NULL; |
| } |
| |
| static inline int ioasid_register_allocator(struct ioasid_allocator_ops *allocator) |
| { |
| return -ENOTSUPP; |
| } |
| |
| static inline void ioasid_unregister_allocator(struct ioasid_allocator_ops *allocator) |
| { |
| } |
| |
| static inline int ioasid_set_data(ioasid_t ioasid, void *data) |
| { |
| return -ENOTSUPP; |
| } |
| |
| #endif /* CONFIG_IOASID */ |
| #endif /* __LINUX_IOASID_H */ |