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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 and only version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 294 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141900.825281744@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
127 lines
2.8 KiB
C
127 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
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*/
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#include <linux/dmaengine.h>
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#include <crypto/scatterwalk.h>
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#include "dma.h"
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int qce_dma_request(struct device *dev, struct qce_dma_data *dma)
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{
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int ret;
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dma->txchan = dma_request_slave_channel_reason(dev, "tx");
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if (IS_ERR(dma->txchan))
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return PTR_ERR(dma->txchan);
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dma->rxchan = dma_request_slave_channel_reason(dev, "rx");
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if (IS_ERR(dma->rxchan)) {
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ret = PTR_ERR(dma->rxchan);
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goto error_rx;
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}
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dma->result_buf = kmalloc(QCE_RESULT_BUF_SZ + QCE_IGNORE_BUF_SZ,
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GFP_KERNEL);
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if (!dma->result_buf) {
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ret = -ENOMEM;
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goto error_nomem;
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}
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dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ;
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return 0;
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error_nomem:
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dma_release_channel(dma->rxchan);
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error_rx:
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dma_release_channel(dma->txchan);
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return ret;
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}
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void qce_dma_release(struct qce_dma_data *dma)
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{
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dma_release_channel(dma->txchan);
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dma_release_channel(dma->rxchan);
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kfree(dma->result_buf);
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}
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struct scatterlist *
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qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl)
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{
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struct scatterlist *sg = sgt->sgl, *sg_last = NULL;
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while (sg) {
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if (!sg_page(sg))
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break;
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sg = sg_next(sg);
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}
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if (!sg)
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return ERR_PTR(-EINVAL);
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while (new_sgl && sg) {
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sg_set_page(sg, sg_page(new_sgl), new_sgl->length,
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new_sgl->offset);
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sg_last = sg;
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sg = sg_next(sg);
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new_sgl = sg_next(new_sgl);
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}
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return sg_last;
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}
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static int qce_dma_prep_sg(struct dma_chan *chan, struct scatterlist *sg,
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int nents, unsigned long flags,
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enum dma_transfer_direction dir,
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dma_async_tx_callback cb, void *cb_param)
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{
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struct dma_async_tx_descriptor *desc;
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dma_cookie_t cookie;
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if (!sg || !nents)
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return -EINVAL;
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desc = dmaengine_prep_slave_sg(chan, sg, nents, dir, flags);
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if (!desc)
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return -EINVAL;
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desc->callback = cb;
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desc->callback_param = cb_param;
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cookie = dmaengine_submit(desc);
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return dma_submit_error(cookie);
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}
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int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *rx_sg,
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int rx_nents, struct scatterlist *tx_sg, int tx_nents,
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dma_async_tx_callback cb, void *cb_param)
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{
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struct dma_chan *rxchan = dma->rxchan;
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struct dma_chan *txchan = dma->txchan;
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unsigned long flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
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int ret;
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ret = qce_dma_prep_sg(rxchan, rx_sg, rx_nents, flags, DMA_MEM_TO_DEV,
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NULL, NULL);
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if (ret)
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return ret;
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return qce_dma_prep_sg(txchan, tx_sg, tx_nents, flags, DMA_DEV_TO_MEM,
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cb, cb_param);
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}
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void qce_dma_issue_pending(struct qce_dma_data *dma)
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{
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dma_async_issue_pending(dma->rxchan);
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dma_async_issue_pending(dma->txchan);
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}
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int qce_dma_terminate_all(struct qce_dma_data *dma)
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{
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int ret;
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ret = dmaengine_terminate_all(dma->rxchan);
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return ret ?: dmaengine_terminate_all(dma->txchan);
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}
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