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32e92d9f6f
Currently the rcache structures are allocated for all IOVA domains, even if they do not use "fast" alloc+free interface. This is wasteful of memory. In addition, fails in init_iova_rcaches() are not handled safely, which is less than ideal. Make "fast" users call a separate rcache init explicitly, which includes error checking. Signed-off-by: John Garry <john.garry@huawei.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Link: https://lore.kernel.org/r/1643882360-241739-1-git-send-email-john.garry@huawei.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
163 lines
4 KiB
C
163 lines
4 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/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_rcache;
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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 anchor; /* rbtree lookup anchor */
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struct iova_rcache *rcaches;
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struct hlist_node cpuhp_dead;
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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_ENABLED(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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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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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 init_iova_domain(struct iova_domain *iovad, unsigned long granule,
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unsigned long start_pfn);
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int iova_domain_init_rcaches(struct iova_domain *iovad);
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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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#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 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 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 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 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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#endif
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#endif
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