31d36a8989
Some SMMUs can walk page tables in the CPU cache, avoiding the need to do cache maintenance operations on the page table memory. Don't do cache maintenance on SMMUs with coherent page tables. Change-Id: I47e00e72548212209b59c13a0d7d59cb0ab964ff Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/* Copyright (c) 2016, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __LINUX_DMA_MAPPING_FAST_H
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#define __LINUX_DMA_MAPPING_FAST_H
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#include <linux/iommu.h>
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#include <linux/io-pgtable-fast.h>
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struct dma_iommu_mapping;
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struct dma_fast_smmu_mapping {
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struct device *dev;
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struct iommu_domain *domain;
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dma_addr_t base;
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size_t size;
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size_t num_4k_pages;
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unsigned int bitmap_size;
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unsigned long *bitmap;
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unsigned long next_start;
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unsigned long upcoming_stale_bit;
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bool have_stale_tlbs;
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dma_addr_t pgtbl_dma_handle;
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av8l_fast_iopte *pgtbl_pmds;
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spinlock_t lock;
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struct notifier_block notifier;
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int is_smmu_pt_coherent;
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};
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#ifdef CONFIG_IOMMU_IO_PGTABLE_FAST
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int fast_smmu_attach_device(struct device *dev,
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struct dma_iommu_mapping *mapping);
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void fast_smmu_detach_device(struct device *dev,
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struct dma_iommu_mapping *mapping);
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#else
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static inline int fast_smmu_attach_device(struct device *dev,
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struct dma_iommu_mapping *mapping)
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{
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return -ENODEV;
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}
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static inline void fast_smmu_detach_device(struct device *dev,
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struct dma_iommu_mapping *mapping)
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{
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}
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#endif
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#endif /* __LINUX_DMA_MAPPING_FAST_H */
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