Edit File: iova.h
/* * Copyright (c) 2006, Intel Corporation. * * This file is released under the GPLv2. * * 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/atomic.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_magazine; struct iova_cpu_rcache; #define IOVA_RANGE_CACHE_MAX_SIZE 6 /* log of max cached IOVA range size (in pages) */ #define MAX_GLOBAL_MAGS 32 /* magazines per bin */ struct iova_rcache { spinlock_t lock; unsigned long depot_size; struct iova_magazine *depot[MAX_GLOBAL_MAGS]; struct iova_cpu_rcache __percpu *cpu_rcaches; }; struct iova_domain; /* Call-Back from IOVA code into IOMMU drivers */ typedef void (* iova_flush_cb)(struct iova_domain *domain); /* Destructor for per-entry data */ typedef void (* iova_entry_dtor)(unsigned long data); /* Number of entries per Flush Queue */ #define IOVA_FQ_SIZE 256 /* Timeout (in ms) after which entries are flushed from the Flush-Queue */ #define IOVA_FQ_TIMEOUT 10 /* Flush Queue entry for defered flushing */ struct iova_fq_entry { unsigned long iova_pfn; unsigned long pages; unsigned long data; u64 counter; /* Flush counter when this entrie was added */ }; /* Per-CPU Flush Queue structure */ struct iova_fq { struct iova_fq_entry entries[IOVA_FQ_SIZE]; unsigned head, tail; spinlock_t lock; }; /* 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[IOVA_RANGE_CACHE_MAX_SIZE]; /* IOVA range caches */ iova_flush_cb flush_cb; /* Call-Back function to flush IOMMU TLBs */ iova_entry_dtor entry_dtor; /* IOMMU driver specific destructor for iova entry */ struct iova_fq __percpu *fq; /* Flush Queue */ atomic64_t fq_flush_start_cnt; /* Number of TLB flushes that have been started */ atomic64_t fq_flush_finish_cnt; /* Number of TLB flushes that have been finished */ struct timer_list fq_timer; /* Timer to regularily empty the flush-queues */ atomic_t fq_timer_on; /* 1 when timer is active, 0 when not */ }; 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_ENABLED(CONFIG_IOMMU_IOVA) int iova_cache_get(void); void iova_cache_put(void); struct iova *alloc_iova_mem(void); void free_iova_mem(struct iova *iova); 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); void queue_iova(struct iova_domain *iovad, unsigned long pfn, unsigned long pages, unsigned long data); 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 copy_reserved_iova(struct iova_domain *from, struct iova_domain *to); void init_iova_domain(struct iova_domain *iovad, unsigned long granule, unsigned long start_pfn); int init_iova_flush_queue(struct iova_domain *iovad, iova_flush_cb flush_cb, iova_entry_dtor entry_dtor); struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); void put_iova_domain(struct iova_domain *iovad); struct iova *split_and_remove_iova(struct iova_domain *iovad, struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi); void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad); #else static inline int iova_cache_get(void) { return -ENOTSUPP; } static inline void iova_cache_put(void) { } static inline struct iova *alloc_iova_mem(void) { return NULL; } static inline void free_iova_mem(struct iova *iova) { } 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 void queue_iova(struct iova_domain *iovad, unsigned long pfn, unsigned long pages, unsigned long data) { } 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 copy_reserved_iova(struct iova_domain *from, struct iova_domain *to) { } static inline void init_iova_domain(struct iova_domain *iovad, unsigned long granule, unsigned long start_pfn) { } static inline int init_iova_flush_queue(struct iova_domain *iovad, iova_flush_cb flush_cb, iova_entry_dtor entry_dtor) { return -ENODEV; } 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) { } static inline struct iova *split_and_remove_iova(struct iova_domain *iovad, struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi) { return NULL; } static inline void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad) { } #endif #endif