277 lines
7.1 KiB
C
277 lines
7.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2006, Intel Corporation.
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*
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* Copyright (C) 2006-2008 Intel Corporation
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* Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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*/
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#ifndef _IOVA_H_
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#define _IOVA_H_
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/rbtree.h>
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#include <linux/atomic.h>
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#include <linux/dma-mapping.h>
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/* iova structure */
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struct iova {
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struct rb_node node;
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unsigned long pfn_hi; /* Highest allocated pfn */
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unsigned long pfn_lo; /* Lowest allocated pfn */
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};
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struct iova_magazine;
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struct iova_cpu_rcache;
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#define IOVA_RANGE_CACHE_MAX_SIZE 6 /* log of max cached IOVA range size (in pages) */
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struct iova_rcache {
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spinlock_t lock;
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unsigned int depot_size;
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struct iova_magazine *depot;
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struct iova_cpu_rcache __percpu *cpu_rcaches;
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struct iova_domain *iovad;
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struct delayed_work work;
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};
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struct iova_domain;
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/* Call-Back from IOVA code into IOMMU drivers */
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typedef void (* iova_flush_cb)(struct iova_domain *domain);
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/* Destructor for per-entry data */
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typedef void (* iova_entry_dtor)(unsigned long data);
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/* Number of entries per Flush Queue */
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#define IOVA_FQ_SIZE 256
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/* Timeout (in ms) after which entries are flushed from the Flush-Queue */
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#define IOVA_FQ_TIMEOUT 10
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/* Flush Queue entry for defered flushing */
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struct iova_fq_entry {
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unsigned long iova_pfn;
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unsigned long pages;
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unsigned long data;
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u64 counter; /* Flush counter when this entrie was added */
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};
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/* Per-CPU Flush Queue structure */
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struct iova_fq {
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struct iova_fq_entry entries[IOVA_FQ_SIZE];
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unsigned head, tail;
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spinlock_t lock;
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};
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/* holds all the iova translations for a domain */
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struct iova_domain {
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spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
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struct rb_root rbroot; /* iova domain rbtree root */
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struct rb_node *cached_node; /* Save last alloced node */
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struct rb_node *cached32_node; /* Save last 32-bit alloced node */
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unsigned long granule; /* pfn granularity for this domain */
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unsigned long start_pfn; /* Lower limit for this domain */
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unsigned long dma_32bit_pfn;
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unsigned long max32_alloc_size; /* Size of last failed allocation */
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struct iova_fq __percpu *fq; /* Flush Queue */
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atomic64_t fq_flush_start_cnt; /* Number of TLB flushes that
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have been started */
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atomic64_t fq_flush_finish_cnt; /* Number of TLB flushes that
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have been finished */
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struct iova anchor; /* rbtree lookup anchor */
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struct iova_rcache rcaches[IOVA_RANGE_CACHE_MAX_SIZE]; /* IOVA range caches */
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iova_flush_cb flush_cb; /* Call-Back function to flush IOMMU
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TLBs */
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iova_entry_dtor entry_dtor; /* IOMMU driver specific destructor for
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iova entry */
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struct timer_list fq_timer; /* Timer to regularily empty the
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flush-queues */
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atomic_t fq_timer_on; /* 1 when timer is active, 0
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when not */
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};
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static inline unsigned long iova_size(struct iova *iova)
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{
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return iova->pfn_hi - iova->pfn_lo + 1;
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}
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static inline unsigned long iova_shift(struct iova_domain *iovad)
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{
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return __ffs(iovad->granule);
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}
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static inline unsigned long iova_mask(struct iova_domain *iovad)
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{
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return iovad->granule - 1;
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}
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static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova)
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{
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return iova & iova_mask(iovad);
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}
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static inline size_t iova_align(struct iova_domain *iovad, size_t size)
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{
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return ALIGN(size, iovad->granule);
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}
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static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova)
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{
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return (dma_addr_t)iova->pfn_lo << iova_shift(iovad);
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}
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static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
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{
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return iova >> iova_shift(iovad);
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}
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#if IS_REACHABLE(CONFIG_IOMMU_IOVA)
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int iova_cache_get(void);
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void iova_cache_put(void);
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struct iova *alloc_iova_mem(void);
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void free_iova_mem(struct iova *iova);
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void free_iova(struct iova_domain *iovad, unsigned long pfn);
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void __free_iova(struct iova_domain *iovad, struct iova *iova);
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struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
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unsigned long limit_pfn,
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bool size_aligned);
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void free_iova_fast(struct iova_domain *iovad, unsigned long pfn,
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unsigned long size);
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void queue_iova(struct iova_domain *iovad,
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unsigned long pfn, unsigned long pages,
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unsigned long data);
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unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size,
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unsigned long limit_pfn, bool flush_rcache);
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struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
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unsigned long pfn_hi);
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void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
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void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
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unsigned long start_pfn);
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bool has_iova_flush_queue(struct iova_domain *iovad);
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int init_iova_flush_queue(struct iova_domain *iovad,
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iova_flush_cb flush_cb, iova_entry_dtor entry_dtor);
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struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
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void put_iova_domain(struct iova_domain *iovad);
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struct iova *split_and_remove_iova(struct iova_domain *iovad,
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struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
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void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad);
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#else
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static inline int iova_cache_get(void)
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{
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return -ENOTSUPP;
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}
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static inline void iova_cache_put(void)
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{
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}
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static inline struct iova *alloc_iova_mem(void)
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{
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return NULL;
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}
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static inline void free_iova_mem(struct iova *iova)
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{
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}
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static inline void free_iova(struct iova_domain *iovad, unsigned long pfn)
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{
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}
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static inline void __free_iova(struct iova_domain *iovad, struct iova *iova)
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{
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}
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static inline struct iova *alloc_iova(struct iova_domain *iovad,
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unsigned long size,
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unsigned long limit_pfn,
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bool size_aligned)
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{
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return NULL;
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}
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static inline void free_iova_fast(struct iova_domain *iovad,
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unsigned long pfn,
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unsigned long size)
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{
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}
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static inline void queue_iova(struct iova_domain *iovad,
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unsigned long pfn, unsigned long pages,
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unsigned long data)
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{
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}
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static inline unsigned long alloc_iova_fast(struct iova_domain *iovad,
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unsigned long size,
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unsigned long limit_pfn,
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bool flush_rcache)
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{
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return 0;
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}
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static inline struct iova *reserve_iova(struct iova_domain *iovad,
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unsigned long pfn_lo,
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unsigned long pfn_hi)
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{
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return NULL;
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}
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static inline void copy_reserved_iova(struct iova_domain *from,
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struct iova_domain *to)
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{
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}
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static inline void init_iova_domain(struct iova_domain *iovad,
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unsigned long granule,
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unsigned long start_pfn)
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{
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}
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static inline bool has_iova_flush_queue(struct iova_domain *iovad)
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{
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return false;
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}
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static inline int init_iova_flush_queue(struct iova_domain *iovad,
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iova_flush_cb flush_cb,
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iova_entry_dtor entry_dtor)
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{
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return -ENODEV;
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}
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static inline struct iova *find_iova(struct iova_domain *iovad,
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unsigned long pfn)
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{
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return NULL;
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}
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static inline void put_iova_domain(struct iova_domain *iovad)
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{
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}
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static inline struct iova *split_and_remove_iova(struct iova_domain *iovad,
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struct iova *iova,
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unsigned long pfn_lo,
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unsigned long pfn_hi)
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{
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return NULL;
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}
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static inline void free_cpu_cached_iovas(unsigned int cpu,
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struct iova_domain *iovad)
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{
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}
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#endif
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#endif
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