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DMA memory regions are required for Accelerated Function Unit (AFU) usage. These two ioctls allow user space applications to map user memory regions for dma, and unmap them after use. Iova is returned from driver to user space application via DFL_FPGA_PORT_DMA_MAP ioctl. Application needs to unmap it after use, otherwise, driver will unmap them in device file release operation. Each AFU has its own rb tree to keep track of its mapped DMA regions. Ioctl interfaces: * DFL_FPGA_PORT_DMA_MAP Do the dma mapping per user_addr and length provided by user. Return iova in provided struct dfl_fpga_port_dma_map. * DFL_FPGA_PORT_DMA_UNMAP Unmap the dma region per iova provided by user. Signed-off-by: Tim Whisonant <tim.whisonant@intel.com> Signed-off-by: Enno Luebbers <enno.luebbers@intel.com> Signed-off-by: Shiva Rao <shiva.rao@intel.com> Signed-off-by: Christopher Rauer <christopher.rauer@intel.com> Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Wu Hao <hao.wu@intel.com> Acked-by: Alan Tull <atull@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Header file for FPGA Accelerated Function Unit (AFU) Driver
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*
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* Copyright (C) 2017-2018 Intel Corporation, Inc.
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*
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* Authors:
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* Wu Hao <hao.wu@intel.com>
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* Xiao Guangrong <guangrong.xiao@linux.intel.com>
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* Joseph Grecco <joe.grecco@intel.com>
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* Enno Luebbers <enno.luebbers@intel.com>
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* Tim Whisonant <tim.whisonant@intel.com>
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* Ananda Ravuri <ananda.ravuri@intel.com>
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* Henry Mitchel <henry.mitchel@intel.com>
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*/
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#ifndef __DFL_AFU_H
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#define __DFL_AFU_H
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#include <linux/mm.h>
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#include "dfl.h"
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/**
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* struct dfl_afu_mmio_region - afu mmio region data structure
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*
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* @index: region index.
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* @flags: region flags (access permission).
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* @size: region size.
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* @offset: region offset from start of the device fd.
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* @phys: region's physical address.
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* @node: node to add to afu feature dev's region list.
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*/
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struct dfl_afu_mmio_region {
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u32 index;
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u32 flags;
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u64 size;
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u64 offset;
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u64 phys;
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struct list_head node;
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};
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/**
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* struct fpga_afu_dma_region - afu DMA region data structure
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*
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* @user_addr: region userspace virtual address.
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* @length: region length.
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* @iova: region IO virtual address.
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* @pages: ptr to pages of this region.
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* @node: rb tree node.
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* @in_use: flag to indicate if this region is in_use.
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*/
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struct dfl_afu_dma_region {
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u64 user_addr;
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u64 length;
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u64 iova;
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struct page **pages;
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struct rb_node node;
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bool in_use;
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};
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/**
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* struct dfl_afu - afu device data structure
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*
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* @region_cur_offset: current region offset from start to the device fd.
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* @num_regions: num of mmio regions.
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* @regions: the mmio region linked list of this afu feature device.
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* @dma_regions: root of dma regions rb tree.
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* @num_umsgs: num of umsgs.
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* @pdata: afu platform device's pdata.
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*/
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struct dfl_afu {
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u64 region_cur_offset;
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int num_regions;
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u8 num_umsgs;
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struct list_head regions;
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struct rb_root dma_regions;
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struct dfl_feature_platform_data *pdata;
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};
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void afu_mmio_region_init(struct dfl_feature_platform_data *pdata);
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int afu_mmio_region_add(struct dfl_feature_platform_data *pdata,
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u32 region_index, u64 region_size, u64 phys, u32 flags);
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void afu_mmio_region_destroy(struct dfl_feature_platform_data *pdata);
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int afu_mmio_region_get_by_index(struct dfl_feature_platform_data *pdata,
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u32 region_index,
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struct dfl_afu_mmio_region *pregion);
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int afu_mmio_region_get_by_offset(struct dfl_feature_platform_data *pdata,
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u64 offset, u64 size,
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struct dfl_afu_mmio_region *pregion);
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void afu_dma_region_init(struct dfl_feature_platform_data *pdata);
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void afu_dma_region_destroy(struct dfl_feature_platform_data *pdata);
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int afu_dma_map_region(struct dfl_feature_platform_data *pdata,
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u64 user_addr, u64 length, u64 *iova);
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int afu_dma_unmap_region(struct dfl_feature_platform_data *pdata, u64 iova);
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struct dfl_afu_dma_region *
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afu_dma_region_find(struct dfl_feature_platform_data *pdata,
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u64 iova, u64 size);
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#endif /* __DFL_AFU_H */
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