forked from luck/tmp_suning_uos_patched
80b20dd853
The following patch is an update to use an array instead of a list of IOVA's in the implementation of defered iotlb flushes. It takes inspiration from sba_iommu.c I like this implementation better as it encapsulates the batch process within intel-iommu.c, and no longer touches iova.h (which is shared) Performance data: Netperf 32byte UDP streaming 2.6.25-rc3-mm1: IOMMU-strict : 58Mps @ 62% cpu NO-IOMMU : 71Mbs @ 41% cpu List-based IOMMU-default-batched-IOTLB flush: 66Mbps @ 57% cpu with this patch: IOMMU-strict : 73Mps @ 75% cpu NO-IOMMU : 74Mbs @ 42% cpu Array-based IOMMU-default-batched-IOTLB flush: 72Mbps @ 62% cpu Signed-off-by: <mgross@linux.intel.com> Cc: Grant Grundler <grundler@parisc-linux.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/*
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* Copyright (c) 2006, Intel Corporation.
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*
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* This file is released under the GPLv2.
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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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*/
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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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/* IO virtual address start page frame number */
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#define IOVA_START_PFN (1)
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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; /* IOMMU dish out addr hi */
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unsigned long pfn_lo; /* IOMMU dish out addr lo */
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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_alloc_lock;/* Lock to protect iova allocation */
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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 *cached32_node; /* Save last alloced node */
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unsigned long dma_32bit_pfn;
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};
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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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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 pfn_32bit);
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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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#endif
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