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d7b4e3287c
Since commit 295525e29a ("virtio_net: merge dma
operations when filling mergeable buffers"), VDUSE device
require support for DMA's .sync_single_for_cpu() operation
as the memory is non-coherent between the device and CPU
because of the use of a bounce buffer.
This patch implements both .sync_single_for_cpu() and
.sync_single_for_device() callbacks, and also skip bounce
buffer copies during DMA map and unmap operations if the
DMA_ATTR_SKIP_CPU_SYNC attribute is set to avoid extra
copies of the same buffer.
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Message-Id: <20240219170606.587290-1-maxime.coquelin@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* MMU-based software IOTLB.
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*
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* Copyright (C) 2020-2021 Bytedance Inc. and/or its affiliates. All rights reserved.
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*
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* Author: Xie Yongji <xieyongji@bytedance.com>
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*
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*/
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#ifndef _VDUSE_IOVA_DOMAIN_H
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#define _VDUSE_IOVA_DOMAIN_H
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#include <linux/iova.h>
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#include <linux/dma-mapping.h>
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#include <linux/vhost_iotlb.h>
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#define IOVA_START_PFN 1
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#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
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struct vduse_bounce_map {
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struct page *bounce_page;
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u64 orig_phys;
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};
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struct vduse_iova_domain {
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struct iova_domain stream_iovad;
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struct iova_domain consistent_iovad;
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struct vduse_bounce_map *bounce_maps;
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size_t bounce_size;
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unsigned long iova_limit;
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int bounce_map;
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struct vhost_iotlb *iotlb;
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spinlock_t iotlb_lock;
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struct file *file;
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bool user_bounce_pages;
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rwlock_t bounce_lock;
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};
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int vduse_domain_set_map(struct vduse_iova_domain *domain,
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struct vhost_iotlb *iotlb);
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void vduse_domain_clear_map(struct vduse_iova_domain *domain,
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struct vhost_iotlb *iotlb);
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void vduse_domain_sync_single_for_device(struct vduse_iova_domain *domain,
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dma_addr_t dma_addr, size_t size,
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enum dma_data_direction dir);
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void vduse_domain_sync_single_for_cpu(struct vduse_iova_domain *domain,
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dma_addr_t dma_addr, size_t size,
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enum dma_data_direction dir);
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dma_addr_t vduse_domain_map_page(struct vduse_iova_domain *domain,
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struct page *page, unsigned long offset,
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size_t size, enum dma_data_direction dir,
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unsigned long attrs);
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void vduse_domain_unmap_page(struct vduse_iova_domain *domain,
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dma_addr_t dma_addr, size_t size,
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enum dma_data_direction dir, unsigned long attrs);
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void *vduse_domain_alloc_coherent(struct vduse_iova_domain *domain,
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size_t size, dma_addr_t *dma_addr,
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gfp_t flag, unsigned long attrs);
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void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size,
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void *vaddr, dma_addr_t dma_addr,
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unsigned long attrs);
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void vduse_domain_reset_bounce_map(struct vduse_iova_domain *domain);
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int vduse_domain_add_user_bounce_pages(struct vduse_iova_domain *domain,
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struct page **pages, int count);
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void vduse_domain_remove_user_bounce_pages(struct vduse_iova_domain *domain);
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void vduse_domain_destroy(struct vduse_iova_domain *domain);
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struct vduse_iova_domain *vduse_domain_create(unsigned long iova_limit,
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size_t bounce_size);
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int vduse_domain_init(void);
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void vduse_domain_exit(void);
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#endif /* _VDUSE_IOVA_DOMAIN_H */
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