diff options
Diffstat (limited to 'include/linux/iova.h')
| -rw-r--r-- | include/linux/iova.h | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/include/linux/iova.h b/include/linux/iova.h new file mode 100644 index 000000000..83c00fac2 --- /dev/null +++ b/include/linux/iova.h @@ -0,0 +1,165 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2006, Intel Corporation. + * + * Copyright (C) 2006-2008 Intel Corporation + * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> + */ + +#ifndef _IOVA_H_ +#define _IOVA_H_ + +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/rbtree.h> +#include <linux/dma-mapping.h> + +/* iova structure */ +struct iova { + struct rb_node node; + unsigned long pfn_hi; /* Highest allocated pfn */ + unsigned long pfn_lo; /* Lowest allocated pfn */ +}; + + +struct iova_rcache; + +/* holds all the iova translations for a domain */ +struct iova_domain { + spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */ + struct rb_root rbroot; /* iova domain rbtree root */ + struct rb_node *cached_node; /* Save last alloced node */ + struct rb_node *cached32_node; /* Save last 32-bit alloced node */ + unsigned long granule; /* pfn granularity for this domain */ + unsigned long start_pfn; /* Lower limit for this domain */ + unsigned long dma_32bit_pfn; + unsigned long max32_alloc_size; /* Size of last failed allocation */ + struct iova anchor; /* rbtree lookup anchor */ + + struct iova_rcache *rcaches; + struct hlist_node cpuhp_dead; +}; + +static inline unsigned long iova_size(struct iova *iova) +{ + return iova->pfn_hi - iova->pfn_lo + 1; +} + +static inline unsigned long iova_shift(struct iova_domain *iovad) +{ + return __ffs(iovad->granule); +} + +static inline unsigned long iova_mask(struct iova_domain *iovad) +{ + return iovad->granule - 1; +} + +static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova) +{ + return iova & iova_mask(iovad); +} + +static inline size_t iova_align(struct iova_domain *iovad, size_t size) +{ + return ALIGN(size, iovad->granule); +} + +static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova) +{ + return (dma_addr_t)iova->pfn_lo << iova_shift(iovad); +} + +static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova) +{ + return iova >> iova_shift(iovad); +} + +#if IS_REACHABLE(CONFIG_IOMMU_IOVA) +int iova_cache_get(void); +void iova_cache_put(void); + +unsigned long iova_rcache_range(void); + +void free_iova(struct iova_domain *iovad, unsigned long pfn); +void __free_iova(struct iova_domain *iovad, struct iova *iova); +struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, + unsigned long limit_pfn, + bool size_aligned); +void free_iova_fast(struct iova_domain *iovad, unsigned long pfn, + unsigned long size); +unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size, + unsigned long limit_pfn, bool flush_rcache); +struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, + unsigned long pfn_hi); +void init_iova_domain(struct iova_domain *iovad, unsigned long granule, + unsigned long start_pfn); +int iova_domain_init_rcaches(struct iova_domain *iovad); +struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); +void put_iova_domain(struct iova_domain *iovad); +#else +static inline int iova_cache_get(void) +{ + return -ENOTSUPP; +} + +static inline void iova_cache_put(void) +{ +} + +static inline void free_iova(struct iova_domain *iovad, unsigned long pfn) +{ +} + +static inline void __free_iova(struct iova_domain *iovad, struct iova *iova) +{ +} + +static inline struct iova *alloc_iova(struct iova_domain *iovad, + unsigned long size, + unsigned long limit_pfn, + bool size_aligned) +{ + return NULL; +} + +static inline void free_iova_fast(struct iova_domain *iovad, + unsigned long pfn, + unsigned long size) +{ +} + +static inline unsigned long alloc_iova_fast(struct iova_domain *iovad, + unsigned long size, + unsigned long limit_pfn, + bool flush_rcache) +{ + return 0; +} + +static inline struct iova *reserve_iova(struct iova_domain *iovad, + unsigned long pfn_lo, + unsigned long pfn_hi) +{ + return NULL; +} + +static inline void init_iova_domain(struct iova_domain *iovad, + unsigned long granule, + unsigned long start_pfn) +{ +} + +static inline struct iova *find_iova(struct iova_domain *iovad, + unsigned long pfn) +{ + return NULL; +} + +static inline void put_iova_domain(struct iova_domain *iovad) +{ +} + +#endif + +#endif |