513 lines
14 KiB
C
513 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2012-2018 ARM Limited or its affiliates. */
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#include <crypto/authenc.h>
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#include <crypto/scatterwalk.h>
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#include <linux/dmapool.h>
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#include <linux/dma-mapping.h>
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#include "cc_buffer_mgr.h"
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#include "cc_lli_defs.h"
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#include "cc_cipher.h"
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enum dma_buffer_type {
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DMA_NULL_TYPE = -1,
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DMA_SGL_TYPE = 1,
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DMA_BUFF_TYPE = 2,
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};
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struct buff_mgr_handle {
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struct dma_pool *mlli_buffs_pool;
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};
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union buffer_array_entry {
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struct scatterlist *sgl;
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dma_addr_t buffer_dma;
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};
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struct buffer_array {
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unsigned int num_of_buffers;
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union buffer_array_entry entry[MAX_NUM_OF_BUFFERS_IN_MLLI];
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unsigned int offset[MAX_NUM_OF_BUFFERS_IN_MLLI];
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int nents[MAX_NUM_OF_BUFFERS_IN_MLLI];
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int total_data_len[MAX_NUM_OF_BUFFERS_IN_MLLI];
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enum dma_buffer_type type[MAX_NUM_OF_BUFFERS_IN_MLLI];
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bool is_last[MAX_NUM_OF_BUFFERS_IN_MLLI];
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u32 *mlli_nents[MAX_NUM_OF_BUFFERS_IN_MLLI];
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};
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static inline char *cc_dma_buf_type(enum cc_req_dma_buf_type type)
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{
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switch (type) {
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case CC_DMA_BUF_NULL:
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return "BUF_NULL";
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case CC_DMA_BUF_DLLI:
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return "BUF_DLLI";
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case CC_DMA_BUF_MLLI:
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return "BUF_MLLI";
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default:
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return "BUF_INVALID";
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}
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}
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/**
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* cc_get_sgl_nents() - Get scatterlist number of entries.
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*
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* @sg_list: SG list
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* @nbytes: [IN] Total SGL data bytes.
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* @lbytes: [OUT] Returns the amount of bytes at the last entry
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*/
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static unsigned int cc_get_sgl_nents(struct device *dev,
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struct scatterlist *sg_list,
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unsigned int nbytes, u32 *lbytes,
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bool *is_chained)
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{
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unsigned int nents = 0;
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while (nbytes && sg_list) {
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if (sg_list->length) {
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nents++;
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/* get the number of bytes in the last entry */
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*lbytes = nbytes;
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nbytes -= (sg_list->length > nbytes) ?
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nbytes : sg_list->length;
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sg_list = sg_next(sg_list);
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} else {
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sg_list = (struct scatterlist *)sg_page(sg_list);
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if (is_chained)
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*is_chained = true;
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}
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}
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dev_dbg(dev, "nents %d last bytes %d\n", nents, *lbytes);
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return nents;
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}
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/**
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* cc_zero_sgl() - Zero scatter scatter list data.
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*
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* @sgl:
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*/
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void cc_zero_sgl(struct scatterlist *sgl, u32 data_len)
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{
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struct scatterlist *current_sg = sgl;
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int sg_index = 0;
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while (sg_index <= data_len) {
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if (!current_sg) {
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/* reached the end of the sgl --> just return back */
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return;
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}
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memset(sg_virt(current_sg), 0, current_sg->length);
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sg_index += current_sg->length;
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current_sg = sg_next(current_sg);
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}
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}
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/**
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* cc_copy_sg_portion() - Copy scatter list data,
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* from to_skip to end, to dest and vice versa
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*
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* @dest:
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* @sg:
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* @to_skip:
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* @end:
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* @direct:
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*/
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void cc_copy_sg_portion(struct device *dev, u8 *dest, struct scatterlist *sg,
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u32 to_skip, u32 end, enum cc_sg_cpy_direct direct)
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{
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u32 nents, lbytes;
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nents = cc_get_sgl_nents(dev, sg, end, &lbytes, NULL);
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sg_copy_buffer(sg, nents, (void *)dest, (end - to_skip + 1), to_skip,
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(direct == CC_SG_TO_BUF));
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}
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static int cc_render_buff_to_mlli(struct device *dev, dma_addr_t buff_dma,
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u32 buff_size, u32 *curr_nents,
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u32 **mlli_entry_pp)
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{
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u32 *mlli_entry_p = *mlli_entry_pp;
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u32 new_nents;
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/* Verify there is no memory overflow*/
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new_nents = (*curr_nents + buff_size / CC_MAX_MLLI_ENTRY_SIZE + 1);
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if (new_nents > MAX_NUM_OF_TOTAL_MLLI_ENTRIES)
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return -ENOMEM;
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/*handle buffer longer than 64 kbytes */
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while (buff_size > CC_MAX_MLLI_ENTRY_SIZE) {
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cc_lli_set_addr(mlli_entry_p, buff_dma);
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cc_lli_set_size(mlli_entry_p, CC_MAX_MLLI_ENTRY_SIZE);
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dev_dbg(dev, "entry[%d]: single_buff=0x%08X size=%08X\n",
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*curr_nents, mlli_entry_p[LLI_WORD0_OFFSET],
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mlli_entry_p[LLI_WORD1_OFFSET]);
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buff_dma += CC_MAX_MLLI_ENTRY_SIZE;
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buff_size -= CC_MAX_MLLI_ENTRY_SIZE;
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mlli_entry_p = mlli_entry_p + 2;
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(*curr_nents)++;
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}
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/*Last entry */
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cc_lli_set_addr(mlli_entry_p, buff_dma);
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cc_lli_set_size(mlli_entry_p, buff_size);
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dev_dbg(dev, "entry[%d]: single_buff=0x%08X size=%08X\n",
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*curr_nents, mlli_entry_p[LLI_WORD0_OFFSET],
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mlli_entry_p[LLI_WORD1_OFFSET]);
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mlli_entry_p = mlli_entry_p + 2;
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*mlli_entry_pp = mlli_entry_p;
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(*curr_nents)++;
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return 0;
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}
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static int cc_render_sg_to_mlli(struct device *dev, struct scatterlist *sgl,
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u32 sgl_data_len, u32 sgl_offset,
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u32 *curr_nents, u32 **mlli_entry_pp)
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{
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struct scatterlist *curr_sgl = sgl;
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u32 *mlli_entry_p = *mlli_entry_pp;
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s32 rc = 0;
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for ( ; (curr_sgl && sgl_data_len);
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curr_sgl = sg_next(curr_sgl)) {
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u32 entry_data_len =
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(sgl_data_len > sg_dma_len(curr_sgl) - sgl_offset) ?
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sg_dma_len(curr_sgl) - sgl_offset :
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sgl_data_len;
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sgl_data_len -= entry_data_len;
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rc = cc_render_buff_to_mlli(dev, sg_dma_address(curr_sgl) +
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sgl_offset, entry_data_len,
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curr_nents, &mlli_entry_p);
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if (rc)
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return rc;
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sgl_offset = 0;
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}
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*mlli_entry_pp = mlli_entry_p;
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return 0;
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}
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static int cc_generate_mlli(struct device *dev, struct buffer_array *sg_data,
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struct mlli_params *mlli_params, gfp_t flags)
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{
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u32 *mlli_p;
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u32 total_nents = 0, prev_total_nents = 0;
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int rc = 0, i;
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dev_dbg(dev, "NUM of SG's = %d\n", sg_data->num_of_buffers);
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/* Allocate memory from the pointed pool */
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mlli_params->mlli_virt_addr =
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dma_pool_alloc(mlli_params->curr_pool, flags,
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&mlli_params->mlli_dma_addr);
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if (!mlli_params->mlli_virt_addr) {
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dev_err(dev, "dma_pool_alloc() failed\n");
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rc = -ENOMEM;
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goto build_mlli_exit;
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}
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/* Point to start of MLLI */
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mlli_p = (u32 *)mlli_params->mlli_virt_addr;
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/* go over all SG's and link it to one MLLI table */
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for (i = 0; i < sg_data->num_of_buffers; i++) {
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union buffer_array_entry *entry = &sg_data->entry[i];
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u32 tot_len = sg_data->total_data_len[i];
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u32 offset = sg_data->offset[i];
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if (sg_data->type[i] == DMA_SGL_TYPE)
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rc = cc_render_sg_to_mlli(dev, entry->sgl, tot_len,
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offset, &total_nents,
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&mlli_p);
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else /*DMA_BUFF_TYPE*/
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rc = cc_render_buff_to_mlli(dev, entry->buffer_dma,
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tot_len, &total_nents,
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&mlli_p);
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if (rc)
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return rc;
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/* set last bit in the current table */
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if (sg_data->mlli_nents[i]) {
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/*Calculate the current MLLI table length for the
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*length field in the descriptor
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*/
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*sg_data->mlli_nents[i] +=
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(total_nents - prev_total_nents);
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prev_total_nents = total_nents;
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}
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}
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/* Set MLLI size for the bypass operation */
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mlli_params->mlli_len = (total_nents * LLI_ENTRY_BYTE_SIZE);
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dev_dbg(dev, "MLLI params: virt_addr=%pK dma_addr=%pad mlli_len=0x%X\n",
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mlli_params->mlli_virt_addr, &mlli_params->mlli_dma_addr,
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mlli_params->mlli_len);
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build_mlli_exit:
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return rc;
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}
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static void cc_add_sg_entry(struct device *dev, struct buffer_array *sgl_data,
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unsigned int nents, struct scatterlist *sgl,
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unsigned int data_len, unsigned int data_offset,
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bool is_last_table, u32 *mlli_nents)
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{
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unsigned int index = sgl_data->num_of_buffers;
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dev_dbg(dev, "index=%u nents=%u sgl=%pK data_len=0x%08X is_last=%d\n",
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index, nents, sgl, data_len, is_last_table);
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sgl_data->nents[index] = nents;
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sgl_data->entry[index].sgl = sgl;
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sgl_data->offset[index] = data_offset;
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sgl_data->total_data_len[index] = data_len;
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sgl_data->type[index] = DMA_SGL_TYPE;
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sgl_data->is_last[index] = is_last_table;
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sgl_data->mlli_nents[index] = mlli_nents;
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if (sgl_data->mlli_nents[index])
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*sgl_data->mlli_nents[index] = 0;
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sgl_data->num_of_buffers++;
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}
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static int cc_dma_map_sg(struct device *dev, struct scatterlist *sg, u32 nents,
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enum dma_data_direction direction)
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{
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u32 i, j;
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struct scatterlist *l_sg = sg;
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for (i = 0; i < nents; i++) {
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if (!l_sg)
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break;
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if (dma_map_sg(dev, l_sg, 1, direction) != 1) {
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dev_err(dev, "dma_map_page() sg buffer failed\n");
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goto err;
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}
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l_sg = sg_next(l_sg);
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}
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return nents;
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err:
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/* Restore mapped parts */
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for (j = 0; j < i; j++) {
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if (!sg)
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break;
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dma_unmap_sg(dev, sg, 1, direction);
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sg = sg_next(sg);
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}
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return 0;
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}
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static int cc_map_sg(struct device *dev, struct scatterlist *sg,
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unsigned int nbytes, int direction, u32 *nents,
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u32 max_sg_nents, u32 *lbytes, u32 *mapped_nents)
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{
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bool is_chained = false;
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if (sg_is_last(sg)) {
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/* One entry only case -set to DLLI */
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if (dma_map_sg(dev, sg, 1, direction) != 1) {
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dev_err(dev, "dma_map_sg() single buffer failed\n");
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return -ENOMEM;
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}
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dev_dbg(dev, "Mapped sg: dma_address=%pad page=%p addr=%pK offset=%u length=%u\n",
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&sg_dma_address(sg), sg_page(sg), sg_virt(sg),
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sg->offset, sg->length);
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*lbytes = nbytes;
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*nents = 1;
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*mapped_nents = 1;
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} else { /*sg_is_last*/
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*nents = cc_get_sgl_nents(dev, sg, nbytes, lbytes,
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&is_chained);
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if (*nents > max_sg_nents) {
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*nents = 0;
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dev_err(dev, "Too many fragments. current %d max %d\n",
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*nents, max_sg_nents);
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return -ENOMEM;
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}
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if (!is_chained) {
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/* In case of mmu the number of mapped nents might
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* be changed from the original sgl nents
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*/
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*mapped_nents = dma_map_sg(dev, sg, *nents, direction);
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if (*mapped_nents == 0) {
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*nents = 0;
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dev_err(dev, "dma_map_sg() sg buffer failed\n");
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return -ENOMEM;
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}
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} else {
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/*In this case the driver maps entry by entry so it
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* must have the same nents before and after map
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*/
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*mapped_nents = cc_dma_map_sg(dev, sg, *nents,
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direction);
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if (*mapped_nents != *nents) {
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*nents = *mapped_nents;
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dev_err(dev, "dma_map_sg() sg buffer failed\n");
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return -ENOMEM;
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}
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}
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}
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return 0;
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}
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void cc_unmap_cipher_request(struct device *dev, void *ctx,
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unsigned int ivsize, struct scatterlist *src,
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struct scatterlist *dst)
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{
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struct cipher_req_ctx *req_ctx = (struct cipher_req_ctx *)ctx;
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if (req_ctx->gen_ctx.iv_dma_addr) {
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dev_dbg(dev, "Unmapped iv: iv_dma_addr=%pad iv_size=%u\n",
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&req_ctx->gen_ctx.iv_dma_addr, ivsize);
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dma_unmap_single(dev, req_ctx->gen_ctx.iv_dma_addr,
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ivsize,
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req_ctx->is_giv ? DMA_BIDIRECTIONAL :
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DMA_TO_DEVICE);
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}
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/* Release pool */
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if (req_ctx->dma_buf_type == CC_DMA_BUF_MLLI &&
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req_ctx->mlli_params.mlli_virt_addr) {
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dma_pool_free(req_ctx->mlli_params.curr_pool,
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req_ctx->mlli_params.mlli_virt_addr,
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req_ctx->mlli_params.mlli_dma_addr);
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}
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dma_unmap_sg(dev, src, req_ctx->in_nents, DMA_BIDIRECTIONAL);
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dev_dbg(dev, "Unmapped req->src=%pK\n", sg_virt(src));
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if (src != dst) {
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dma_unmap_sg(dev, dst, req_ctx->out_nents, DMA_BIDIRECTIONAL);
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dev_dbg(dev, "Unmapped req->dst=%pK\n", sg_virt(dst));
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}
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}
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int cc_map_cipher_request(struct cc_drvdata *drvdata, void *ctx,
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unsigned int ivsize, unsigned int nbytes,
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void *info, struct scatterlist *src,
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struct scatterlist *dst, gfp_t flags)
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{
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struct cipher_req_ctx *req_ctx = (struct cipher_req_ctx *)ctx;
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struct mlli_params *mlli_params = &req_ctx->mlli_params;
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struct buff_mgr_handle *buff_mgr = drvdata->buff_mgr_handle;
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struct device *dev = drvdata_to_dev(drvdata);
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struct buffer_array sg_data;
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u32 dummy = 0;
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int rc = 0;
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u32 mapped_nents = 0;
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req_ctx->dma_buf_type = CC_DMA_BUF_DLLI;
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mlli_params->curr_pool = NULL;
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sg_data.num_of_buffers = 0;
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/* Map IV buffer */
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if (ivsize) {
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dump_byte_array("iv", (u8 *)info, ivsize);
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req_ctx->gen_ctx.iv_dma_addr =
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dma_map_single(dev, (void *)info,
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ivsize,
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req_ctx->is_giv ? DMA_BIDIRECTIONAL :
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DMA_TO_DEVICE);
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if (dma_mapping_error(dev, req_ctx->gen_ctx.iv_dma_addr)) {
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dev_err(dev, "Mapping iv %u B at va=%pK for DMA failed\n",
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ivsize, info);
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return -ENOMEM;
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}
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dev_dbg(dev, "Mapped iv %u B at va=%pK to dma=%pad\n",
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ivsize, info, &req_ctx->gen_ctx.iv_dma_addr);
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} else {
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req_ctx->gen_ctx.iv_dma_addr = 0;
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}
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/* Map the src SGL */
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rc = cc_map_sg(dev, src, nbytes, DMA_BIDIRECTIONAL, &req_ctx->in_nents,
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LLI_MAX_NUM_OF_DATA_ENTRIES, &dummy, &mapped_nents);
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if (rc) {
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rc = -ENOMEM;
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goto cipher_exit;
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}
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if (mapped_nents > 1)
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req_ctx->dma_buf_type = CC_DMA_BUF_MLLI;
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if (src == dst) {
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/* Handle inplace operation */
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if (req_ctx->dma_buf_type == CC_DMA_BUF_MLLI) {
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req_ctx->out_nents = 0;
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cc_add_sg_entry(dev, &sg_data, req_ctx->in_nents, src,
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nbytes, 0, true,
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&req_ctx->in_mlli_nents);
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}
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} else {
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/* Map the dst sg */
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if (cc_map_sg(dev, dst, nbytes, DMA_BIDIRECTIONAL,
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&req_ctx->out_nents, LLI_MAX_NUM_OF_DATA_ENTRIES,
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&dummy, &mapped_nents)) {
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rc = -ENOMEM;
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goto cipher_exit;
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}
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if (mapped_nents > 1)
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req_ctx->dma_buf_type = CC_DMA_BUF_MLLI;
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if (req_ctx->dma_buf_type == CC_DMA_BUF_MLLI) {
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cc_add_sg_entry(dev, &sg_data, req_ctx->in_nents, src,
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nbytes, 0, true,
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&req_ctx->in_mlli_nents);
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cc_add_sg_entry(dev, &sg_data, req_ctx->out_nents, dst,
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nbytes, 0, true,
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|
&req_ctx->out_mlli_nents);
|
|
}
|
|
}
|
|
|
|
if (req_ctx->dma_buf_type == CC_DMA_BUF_MLLI) {
|
|
mlli_params->curr_pool = buff_mgr->mlli_buffs_pool;
|
|
rc = cc_generate_mlli(dev, &sg_data, mlli_params, flags);
|
|
if (rc)
|
|
goto cipher_exit;
|
|
}
|
|
|
|
dev_dbg(dev, "areq_ctx->dma_buf_type = %s\n",
|
|
cc_dma_buf_type(req_ctx->dma_buf_type));
|
|
|
|
return 0;
|
|
|
|
cipher_exit:
|
|
cc_unmap_cipher_request(dev, req_ctx, ivsize, src, dst);
|
|
return rc;
|
|
}
|
|
|
|
int cc_buffer_mgr_init(struct cc_drvdata *drvdata)
|
|
{
|
|
struct buff_mgr_handle *buff_mgr_handle;
|
|
struct device *dev = drvdata_to_dev(drvdata);
|
|
|
|
buff_mgr_handle = kmalloc(sizeof(*buff_mgr_handle), GFP_KERNEL);
|
|
if (!buff_mgr_handle)
|
|
return -ENOMEM;
|
|
|
|
drvdata->buff_mgr_handle = buff_mgr_handle;
|
|
|
|
buff_mgr_handle->mlli_buffs_pool =
|
|
dma_pool_create("dx_single_mlli_tables", dev,
|
|
MAX_NUM_OF_TOTAL_MLLI_ENTRIES *
|
|
LLI_ENTRY_BYTE_SIZE,
|
|
MLLI_TABLE_MIN_ALIGNMENT, 0);
|
|
|
|
if (!buff_mgr_handle->mlli_buffs_pool)
|
|
goto error;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
cc_buffer_mgr_fini(drvdata);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
int cc_buffer_mgr_fini(struct cc_drvdata *drvdata)
|
|
{
|
|
struct buff_mgr_handle *buff_mgr_handle = drvdata->buff_mgr_handle;
|
|
|
|
if (buff_mgr_handle) {
|
|
dma_pool_destroy(buff_mgr_handle->mlli_buffs_pool);
|
|
kfree(drvdata->buff_mgr_handle);
|
|
drvdata->buff_mgr_handle = NULL;
|
|
}
|
|
return 0;
|
|
}
|