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This patch is for batching up the flushing of the IOTLB for the DMAR implementation found in the Intel VT-d hardware. It works by building a list of to be flushed IOTLB entries and a bitmap list of which DMAR engine they are from. After either a high water mark (250 accessible via debugfs) or 10ms the list of iova's will be reclaimed and the DMAR engines associated are IOTLB-flushed. This approach recovers 15 to 20% of the performance lost when using the IOMMU for my netperf udp stream benchmark with small packets. It can be disabled with a kernel boot parameter "intel_iommu=strict". Its use does weaken the IOMMU protections a bit. Signed-off-by: Mark Gross <mgross@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
55 lines
1.6 KiB
C
55 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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struct list_head list;
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void *dmar;
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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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