This adds dmaengine and sg-list helper functions used by other parts of the crypto driver. Signed-off-by: Stanimir Varbanov <svarbanov@xxxxxxxxxx> --- drivers/crypto/qce/dma.c | 201 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/crypto/qce/dma.h | 57 ++++++++++++++ 2 files changed, 258 insertions(+) create mode 100644 drivers/crypto/qce/dma.c create mode 100644 drivers/crypto/qce/dma.h diff --git a/drivers/crypto/qce/dma.c b/drivers/crypto/qce/dma.c new file mode 100644 index 000000000000..1bad958db2f9 --- /dev/null +++ b/drivers/crypto/qce/dma.c @@ -0,0 +1,201 @@ +/* + * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved. + * + * 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. + */ + +#include <linux/interrupt.h> +#include <crypto/algapi.h> +#include <crypto/scatterwalk.h> + +#include "dma.h" +#include "core.h" +#include "common.h" + +int qce_dma_request(struct device *dev, struct qce_dma_data *dma) +{ + unsigned int memsize; + void *va; + int ret; + + dma->txchan = dma_request_slave_channel_reason(dev, "tx"); + if (IS_ERR(dma->txchan)) { + ret = PTR_ERR(dma->txchan); + return ret; + } + + dma->rxchan = dma_request_slave_channel_reason(dev, "rx"); + if (IS_ERR(dma->rxchan)) { + ret = PTR_ERR(dma->rxchan); + goto error_rx; + } + + memsize = QCE_RESULT_BUF_SZ + QCE_IGNORE_BUF_SZ; + va = kzalloc(memsize, GFP_KERNEL); + if (!va) { + ret = -ENOMEM; + goto error_nomem; + } + + dma->result_buf = va; + dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ; + + return 0; +error_nomem: + if (!IS_ERR(dma->rxchan)) + dma_release_channel(dma->rxchan); +error_rx: + if (!IS_ERR(dma->txchan)) + dma_release_channel(dma->txchan); + return ret; +} + +void qce_dma_release(struct qce_dma_data *dma) +{ + dma_release_channel(dma->txchan); + dma_release_channel(dma->rxchan); + kfree(dma->result_buf); +} + +int qce_mapsg(struct device *dev, struct scatterlist *sg, unsigned int nents, + enum dma_data_direction dir, bool chained) +{ + int err; + + if (chained) { + while (sg) { + err = dma_map_sg(dev, sg, 1, dir); + if (!err) + goto error; + sg = scatterwalk_sg_next(sg); + } + } else { + err = dma_map_sg(dev, sg, nents, dir); + if (!err) + goto error; + } + + return nents; +error: + return -EFAULT; +} + +void qce_unmapsg(struct device *dev, struct scatterlist *sg, int nents, + enum dma_data_direction dir, bool chained) +{ + if (chained) + while (sg) { + dma_unmap_sg(dev, sg, 1, dir); + sg = scatterwalk_sg_next(sg); + } + else + dma_unmap_sg(dev, sg, nents, dir); +} + +int qce_countsg(struct scatterlist *sglist, int nbytes, bool *chained) +{ + struct scatterlist *sg = sglist; + int sg_nents = 0; + + if (chained) + *chained = false; + + while (nbytes > 0 && sg) { + sg_nents++; + nbytes -= sg->length; + if (!sg_is_last(sg) && (sg + 1)->length == 0 && chained) + *chained = true; + sg = scatterwalk_sg_next(sg); + } + + return sg_nents; +} + +struct scatterlist * +qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl) +{ + struct scatterlist *sg = sgt->sgl, *sg_last = NULL; + + while (sg) { + if (!sg_page(sg)) + break; + sg = sg_next(sg); + } + + if (!sg) + goto error; + + while (new_sgl && sg) { + sg_set_page(sg, sg_page(new_sgl), new_sgl->length, + new_sgl->offset); + sg_last = sg; + sg = sg_next(sg); + new_sgl = sg_next(new_sgl); + } + + if (new_sgl) + goto error; + + return sg_last; +error: + return ERR_PTR(-EINVAL); +} + +static int qce_dma_prep_sg(struct dma_chan *chan, struct scatterlist *sg, + int nents, unsigned long flags, + enum dma_transfer_direction dir, + dma_async_tx_callback cb, void *cb_param) +{ + struct dma_async_tx_descriptor *desc; + + if (!sg || !nents) + return -EINVAL; + + desc = dmaengine_prep_slave_sg(chan, sg, nents, dir, flags); + if (!desc) + return -EINVAL; + + desc->callback = cb; + desc->callback_param = cb_param; + dmaengine_submit(desc); + return 0; +} + +int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *rx_sg, + int rx_nents, struct scatterlist *tx_sg, int tx_nents, + dma_async_tx_callback cb, void *cb_param) +{ + struct dma_chan *rxchan = dma->rxchan; + struct dma_chan *txchan = dma->txchan; + unsigned long flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK; + int rc; + + rc = qce_dma_prep_sg(rxchan, rx_sg, rx_nents, flags, DMA_MEM_TO_DEV, + NULL, NULL); + if (rc) + return rc; + + rc = qce_dma_prep_sg(txchan, tx_sg, tx_nents, flags, DMA_DEV_TO_MEM, + cb, cb_param); + + return rc; +} + +void qce_dma_issue_pending(struct qce_dma_data *dma) +{ + dma_async_issue_pending(dma->rxchan); + dma_async_issue_pending(dma->txchan); +} + +void qce_dma_terminate_all(struct qce_dma_data *dma) +{ + dmaengine_terminate_all(dma->rxchan); + dmaengine_terminate_all(dma->txchan); +} diff --git a/drivers/crypto/qce/dma.h b/drivers/crypto/qce/dma.h new file mode 100644 index 000000000000..932b02fd8f25 --- /dev/null +++ b/drivers/crypto/qce/dma.h @@ -0,0 +1,57 @@ +/* + * Copyright (c) 2011-2014, The Linux Foundation. All rights reserved. + * + * 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. + */ + +#ifndef _DMA_H_ +#define _DMA_H_ + +#define QCE_AUTHIV_REGS_CNT 16 +#define QCE_AUTH_BYTECOUNT_REGS_CNT 4 +#define QCE_CNTRIV_REGS_CNT 4 + +/* result dump format */ +struct qce_result_dump { + u32 auth_iv[QCE_AUTHIV_REGS_CNT]; + u32 auth_byte_count[QCE_AUTH_BYTECOUNT_REGS_CNT]; + u32 encr_cntr_iv[QCE_CNTRIV_REGS_CNT]; + u32 status; + u32 status2; +}; + +#define QCE_IGNORE_BUF_SZ (2 * QCE_BAM_BURST_SIZE) +#define QCE_RESULT_BUF_SZ \ + ALIGN(sizeof(struct qce_result_dump), QCE_BAM_BURST_SIZE) + +struct qce_dma_data { + struct dma_chan *txchan; + struct dma_chan *rxchan; + struct qce_result_dump *result_buf; + void *ignore_buf; +}; + +int qce_dma_request(struct device *dev, struct qce_dma_data *dma); +void qce_dma_release(struct qce_dma_data *dma); +int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *sg_in, + int in_ents, struct scatterlist *sg_out, int out_ents, + dma_async_tx_callback cb, void *cb_param); +int qce_countsg(struct scatterlist *sg_list, int nbytes, bool *chained); +void qce_unmapsg(struct device *dev, struct scatterlist *sg, int nents, + enum dma_data_direction dir, bool chained); +int qce_mapsg(struct device *dev, struct scatterlist *sg, + unsigned int nents, enum dma_data_direction dir, + bool chained); +struct scatterlist *qce_sgtable_add(struct sg_table *sgt, + struct scatterlist *sg_add); +void qce_dma_issue_pending(struct qce_dma_data *dma); +void qce_dma_terminate_all(struct qce_dma_data *dma); + +#endif /* _DMA_H_ */ -- 1.8.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html