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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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886643b766
Now that the generic swiotlb code supports non-coherent DMA we can switch
to it for arm64. For that we need to refactor the existing
alloc/free/mmap/pgprot helpers to be used as the architecture hooks,
and implement the standard arch_sync_dma_for_{device,cpu} hooks for
cache maintaincance in the streaming dma hooks, which also implies
using the generic dma_coherent flag in struct device.
Note that we need to keep the old is_device_dma_coherent function around
for now, so that the shared arm/arm64 Xen code keeps working.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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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 as
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* 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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_DMA_MAPPING_H
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#define __ASM_DMA_MAPPING_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <linux/vmalloc.h>
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#include <xen/xen.h>
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#include <asm/xen/hypervisor.h>
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extern const struct dma_map_ops dummy_dma_ops;
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static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
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{
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/*
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* We expect no ISA devices, and all other DMA masters are expected to
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* have someone call arch_setup_dma_ops at device creation time.
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*/
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return &dummy_dma_ops;
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}
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void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
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const struct iommu_ops *iommu, bool coherent);
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#define arch_setup_dma_ops arch_setup_dma_ops
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#ifdef CONFIG_IOMMU_DMA
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void arch_teardown_dma_ops(struct device *dev);
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#define arch_teardown_dma_ops arch_teardown_dma_ops
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#endif
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/*
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* Do not use this function in a driver, it is only provided for
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* arch/arm/mm/xen.c, which is used by arm64 as well.
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*/
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static inline bool is_device_dma_coherent(struct device *dev)
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{
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return dev->dma_coherent;
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}
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#endif /* __KERNEL__ */
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#endif /* __ASM_DMA_MAPPING_H */
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