184 lines
5.4 KiB
C
184 lines
5.4 KiB
C
/*
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* Copyright(c) 2015, 2016 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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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 version 2 of the GNU General Public License 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/types.h>
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#include <linux/scatterlist.h>
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#include "verbs.h"
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#define BAD_DMA_ADDRESS ((u64)0)
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/*
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* The following functions implement driver specific replacements
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* for the ib_dma_*() functions.
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*
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* These functions return kernel virtual addresses instead of
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* device bus addresses since the driver uses the CPU to copy
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* data instead of using hardware DMA.
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*/
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static int hfi1_mapping_error(struct ib_device *dev, u64 dma_addr)
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{
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return dma_addr == BAD_DMA_ADDRESS;
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}
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static u64 hfi1_dma_map_single(struct ib_device *dev, void *cpu_addr,
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size_t size, enum dma_data_direction direction)
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{
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if (WARN_ON(!valid_dma_direction(direction)))
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return BAD_DMA_ADDRESS;
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return (u64)cpu_addr;
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}
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static void hfi1_dma_unmap_single(struct ib_device *dev, u64 addr, size_t size,
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enum dma_data_direction direction)
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{
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/* This is a stub, nothing to be done here */
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}
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static u64 hfi1_dma_map_page(struct ib_device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction direction)
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{
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u64 addr;
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if (WARN_ON(!valid_dma_direction(direction)))
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return BAD_DMA_ADDRESS;
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if (offset + size > PAGE_SIZE)
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return BAD_DMA_ADDRESS;
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addr = (u64)page_address(page);
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if (addr)
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addr += offset;
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return addr;
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}
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static void hfi1_dma_unmap_page(struct ib_device *dev, u64 addr, size_t size,
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enum dma_data_direction direction)
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{
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/* This is a stub, nothing to be done here */
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}
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static int hfi1_map_sg(struct ib_device *dev, struct scatterlist *sgl,
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int nents, enum dma_data_direction direction)
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{
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struct scatterlist *sg;
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u64 addr;
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int i;
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int ret = nents;
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if (WARN_ON(!valid_dma_direction(direction)))
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return BAD_DMA_ADDRESS;
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for_each_sg(sgl, sg, nents, i) {
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addr = (u64)page_address(sg_page(sg));
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if (!addr) {
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ret = 0;
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break;
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}
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sg->dma_address = addr + sg->offset;
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#ifdef CONFIG_NEED_SG_DMA_LENGTH
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sg->dma_length = sg->length;
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#endif
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}
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return ret;
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}
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static void hfi1_unmap_sg(struct ib_device *dev,
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struct scatterlist *sg, int nents,
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enum dma_data_direction direction)
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{
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/* This is a stub, nothing to be done here */
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}
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static void hfi1_sync_single_for_cpu(struct ib_device *dev, u64 addr,
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size_t size, enum dma_data_direction dir)
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{
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}
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static void hfi1_sync_single_for_device(struct ib_device *dev, u64 addr,
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size_t size,
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enum dma_data_direction dir)
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{
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}
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static void *hfi1_dma_alloc_coherent(struct ib_device *dev, size_t size,
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u64 *dma_handle, gfp_t flag)
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{
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struct page *p;
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void *addr = NULL;
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p = alloc_pages(flag, get_order(size));
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if (p)
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addr = page_address(p);
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if (dma_handle)
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*dma_handle = (u64)addr;
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return addr;
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}
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static void hfi1_dma_free_coherent(struct ib_device *dev, size_t size,
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void *cpu_addr, u64 dma_handle)
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{
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free_pages((unsigned long)cpu_addr, get_order(size));
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}
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struct ib_dma_mapping_ops hfi1_dma_mapping_ops = {
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.mapping_error = hfi1_mapping_error,
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.map_single = hfi1_dma_map_single,
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.unmap_single = hfi1_dma_unmap_single,
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.map_page = hfi1_dma_map_page,
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.unmap_page = hfi1_dma_unmap_page,
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.map_sg = hfi1_map_sg,
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.unmap_sg = hfi1_unmap_sg,
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.sync_single_for_cpu = hfi1_sync_single_for_cpu,
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.sync_single_for_device = hfi1_sync_single_for_device,
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.alloc_coherent = hfi1_dma_alloc_coherent,
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.free_coherent = hfi1_dma_free_coherent
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};
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