// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */

#include <crypto/internal/aead.h>
#include <crypto/authenc.h>
#include <crypto/scatterwalk.h>
#include <linux/dmapool.h>
#include <linux/dma-mapping.h>

#include "cc_buffer_mgr.h"
#include "cc_lli_defs.h"
#include "cc_cipher.h"
#include "cc_hash.h"
#include "cc_aead.h"

union buffer_array_entry {
        struct scatterlist *sgl;
        dma_addr_t buffer_dma;
};

struct buffer_array {
        unsigned int num_of_buffers;
        union buffer_array_entry entry[MAX_NUM_OF_BUFFERS_IN_MLLI];
        unsigned int offset[MAX_NUM_OF_BUFFERS_IN_MLLI];
        int nents[MAX_NUM_OF_BUFFERS_IN_MLLI];
        int total_data_len[MAX_NUM_OF_BUFFERS_IN_MLLI];
        bool is_last[MAX_NUM_OF_BUFFERS_IN_MLLI];
        u32 *mlli_nents[MAX_NUM_OF_BUFFERS_IN_MLLI];
};

static inline char *cc_dma_buf_type(enum cc_req_dma_buf_type type)
{
        switch (type) {
        case CC_DMA_BUF_NULL:
                return "BUF_NULL";
        case CC_DMA_BUF_DLLI:
                return "BUF_DLLI";
        case CC_DMA_BUF_MLLI:
                return "BUF_MLLI";
        default:
                return "BUF_INVALID";
        }
}

/**
 * cc_copy_mac() - Copy MAC to temporary location
 *
 * @dev: device object
 * @req: aead request object
 * @dir: [IN] copy from/to sgl
 */
static void cc_copy_mac(struct device *dev, struct aead_request *req,
                        enum cc_sg_cpy_direct dir)
{
        struct aead_req_ctx *areq_ctx = aead_request_ctx_dma(req);
        u32 skip = req->assoclen + req->cryptlen;

        cc_copy_sg_portion(dev, areq_ctx->backup_mac, req->src,
                           (skip - areq_ctx->req_authsize), skip, dir);
}

/**
 * cc_get_sgl_nents() - Get scatterlist number of entries.
 *
 * @dev: Device object
 * @sg_list: SG list
 * @nbytes: [IN] Total SGL data bytes.
 * @lbytes: [OUT] Returns the amount of bytes at the last entry
 *
 * Return:
 * Number of entries in the scatterlist
 */
static unsigned int cc_get_sgl_nents(struct device *dev,
                                     struct scatterlist *sg_list,
                                     unsigned int nbytes, u32 *lbytes)
{
        unsigned int nents = 0;

        *lbytes = 0;

        while (nbytes && sg_list) {
                nents++;
                /* get the number of bytes in the last entry */
                *lbytes = nbytes;
                nbytes -= (sg_list->length > nbytes) ?
                                nbytes : sg_list->length;
                sg_list = sg_next(sg_list);
        }

        dev_dbg(dev, "nents %d last bytes %d\n", nents, *lbytes);
        return nents;
}

/**
 * cc_copy_sg_portion() - Copy scatter list data,
 * from to_skip to end, to dest and vice versa
 *
 * @dev: Device object
 * @dest: Buffer to copy to/from
 * @sg: SG list
 * @to_skip: Number of bytes to skip before copying
 * @end: Offset of last byte to copy
 * @direct: Transfer direction (true == from SG list to buffer, false == from
 *          buffer to SG list)
 */
void cc_copy_sg_portion(struct device *dev, u8 *dest, struct scatterlist *sg,
                        u32 to_skip, u32 end, enum cc_sg_cpy_direct direct)
{
        u32 nents;

        nents = sg_nents_for_len(sg, end);
        sg_copy_buffer(sg, nents, dest, (end - to_skip + 1), to_skip,
                       (direct == CC_SG_TO_BUF));
}

static int cc_render_buff_to_mlli(struct device *dev, dma_addr_t buff_dma,
                                  u32 buff_size, u32 *curr_nents,
                                  u32 **mlli_entry_pp)
{
        u32 *mlli_entry_p = *mlli_entry_pp;
        u32 new_nents;

        /* Verify there is no memory overflow*/
        new_nents = (*curr_nents + buff_size / CC_MAX_MLLI_ENTRY_SIZE + 1);
        if (new_nents > MAX_NUM_OF_TOTAL_MLLI_ENTRIES) {
                dev_err(dev, "Too many mlli entries. current %d max %d\n",
                        new_nents, MAX_NUM_OF_TOTAL_MLLI_ENTRIES);
                return -ENOMEM;
        }

        /*handle buffer longer than 64 kbytes */
        while (buff_size > CC_MAX_MLLI_ENTRY_SIZE) {
                cc_lli_set_addr(mlli_entry_p, buff_dma);
                cc_lli_set_size(mlli_entry_p, CC_MAX_MLLI_ENTRY_SIZE);
                dev_dbg(dev, "entry[%d]: single_buff=0x%08X size=%08X\n",
                        *curr_nents, mlli_entry_p[LLI_WORD0_OFFSET],
                        mlli_entry_p[LLI_WORD1_OFFSET]);
                buff_dma += CC_MAX_MLLI_ENTRY_SIZE;
                buff_size -= CC_MAX_MLLI_ENTRY_SIZE;
                mlli_entry_p = mlli_entry_p + 2;
                (*curr_nents)++;
        }
        /*Last entry */
        cc_lli_set_addr(mlli_entry_p, buff_dma);
        cc_lli_set_size(mlli_entry_p, buff_size);
        dev_dbg(dev, "entry[%d]: single_buff=0x%08X size=%08X\n",
                *curr_nents, mlli_entry_p[LLI_WORD0_OFFSET],
                mlli_entry_p[LLI_WORD1_OFFSET]);
        mlli_entry_p = mlli_entry_p + 2;
        *mlli_entry_pp = mlli_entry_p;
        (*curr_nents)++;
        return 0;
}

static int cc_render_sg_to_mlli(struct device *dev, struct scatterlist *sgl,
                                u32 sgl_data_len, u32 sgl_offset,
                                u32 *curr_nents, u32 **mlli_entry_pp)
{
        struct scatterlist *curr_sgl = sgl;
        u32 *mlli_entry_p = *mlli_entry_pp;
        s32 rc = 0;

        for ( ; (curr_sgl && sgl_data_len);
              curr_sgl = sg_next(curr_sgl)) {
                u32 entry_data_len =
                        (sgl_data_len > sg_dma_len(curr_sgl) - sgl_offset) ?
                                sg_dma_len(curr_sgl) - sgl_offset :
                                sgl_data_len;
                sgl_data_len -= entry_data_len;
                rc = cc_render_buff_to_mlli(dev, sg_dma_address(curr_sgl) +
                                            sgl_offset, entry_data_len,
                                            curr_nents, &mlli_entry_p);
                if (rc)
                        return rc;

                sgl_offset = 0;
        }
        *mlli_entry_pp = mlli_entry_p;
        return 0;
}

static int cc_generate_mlli(struct device *dev, struct buffer_array *sg_data,
                            struct mlli_params *mlli_params, gfp_t flags)
{
        u32 *mlli_p;
        u32 total_nents = 0, prev_total_nents = 0;
        int rc = 0, i;

        dev_dbg(dev, "NUM of SG's = %d\n", sg_data->num_of_buffers);

        /* Allocate memory from the pointed pool */
        mlli_params->mlli_virt_addr =
                dma_pool_alloc(mlli_params->curr_pool, flags,
                               &mlli_params->mlli_dma_addr);
        if (!mlli_params->mlli_virt_addr) {
                dev_err(dev, "dma_pool_alloc() failed\n");
                rc = -ENOMEM;
                goto build_mlli_exit;
        }
        /* Point to start of MLLI */
        mlli_p = mlli_params->mlli_virt_addr;
        /* go over all SG's and link it to one MLLI table */
        for (i = 0; i < sg_data->num_of_buffers; i++) {
                union buffer_array_entry *entry = &sg_data->entry[i];
                u32 tot_len = sg_data->total_data_len[i];
                u32 offset = sg_data->offset[i];

                rc = cc_render_sg_to_mlli(dev, entry->sgl, tot_len, offset,
                                          &total_nents, &mlli_p);
                if (rc)
                        return rc;

                /* set last bit in the current table */
                if (sg_data->mlli_nents[i]) {
                        /*Calculate the current MLLI table length for the
                         *length field in the descriptor
                         */
                        *sg_data->mlli_nents[i] +=
                                (total_nents - prev_total_nents);
                        prev_total_nents = total_nents;
                }
        }

        /* Set MLLI size for the bypass operation */
        mlli_params->mlli_len = (total_nents * LLI_ENTRY_BYTE_SIZE);

        dev_dbg(dev, "MLLI params: virt_addr=%p dma_addr=%pad mlli_len=0x%X\n",
                mlli_params->mlli_virt_addr, &mlli_params->mlli_dma_addr,
                mlli_params->mlli_len);

build_mlli_exit:
        return rc;
}

static void cc_add_sg_entry(struct device *dev, struct buffer_array *sgl_data,
                            unsigned int nents, struct scatterlist *sgl,
                            unsigned int data_len, unsigned int data_offset,
                            bool is_last_table, u32 *mlli_nents)
{
        unsigned int index = sgl_data->num_of_buffers;

        dev_dbg(dev, "index=%u nents=%u sgl=%p data_len=0x%08X is_last=%d\n",
                index, nents, sgl, data_len, is_last_table);
        sgl_data->nents[index] = nents;
        sgl_data->entry[index].sgl = sgl;
        sgl_data->offset[index] = data_offset;
        sgl_data->total_data_len[index] = data_len;
        sgl_data->is_last[index] = is_last_table;
        sgl_data->mlli_nents[index] = mlli_nents;
        if (sgl_data->mlli_nents[index])
                *sgl_data->mlli_nents[index] = 0;
        sgl_data->num_of_buffers++;
}

static int cc_map_sg(struct device *dev, struct scatterlist *sg,
                     unsigned int nbytes, int direction, u32 *nents,
                     u32 max_sg_nents, u32 *lbytes, u32 *mapped_nents)
{
        int ret = 0;

        if (!nbytes) {
                *mapped_nents = 0;
                *lbytes = 0;
                *nents = 0;
                return 0;
        }

        *nents = cc_get_sgl_nents(dev, sg, nbytes, lbytes);
        if (*nents > max_sg_nents) {
                *nents = 0;
                dev_err(dev, "Too many fragments. current %d max %d\n",
                        *nents, max_sg_nents);
                return -ENOMEM;
        }

        ret = dma_map_sg(dev, sg, *nents, direction);
        if (!ret) {
                *nents = 0;
                dev_err(dev, "dma_map_sg() sg buffer failed %d\n", ret);
                return -ENOMEM;
        }

        *mapped_nents = ret;

        return 0;
}

static int
cc_set_aead_conf_buf(struct device *dev, struct aead_req_ctx *areq_ctx,
                     u8 *config_data, struct buffer_array *sg_data,
                     unsigned int assoclen)
{
        dev_dbg(dev, " handle additional data config set to DLLI\n");
        /* create sg for the current buffer */
        sg_init_one(&areq_ctx->ccm_adata_sg, config_data,
                    AES_BLOCK_SIZE + areq_ctx->ccm_hdr_size);
        if (dma_map_sg(dev, &areq_ctx->ccm_adata_sg, 1, DMA_TO_DEVICE) != 1) {
                dev_err(dev, "dma_map_sg() config buffer failed\n");
                return -ENOMEM;
        }
        dev_dbg(dev, "Mapped curr_buff: dma_address=%pad page=%p addr=%p offset=%u length=%u\n",
                &sg_dma_address(&areq_ctx->ccm_adata_sg),
                sg_page(&areq_ctx->ccm_adata_sg),
                sg_virt(&areq_ctx->ccm_adata_sg),
                areq_ctx->ccm_adata_sg.offset, areq_ctx->ccm_adata_sg.length);
        /* prepare for case of MLLI */
        if (assoclen > 0) {
                cc_add_sg_entry(dev, sg_data, 1, &areq_ctx->ccm_adata_sg,
                                (AES_BLOCK_SIZE + areq_ctx->ccm_hdr_size),
                                0, false, NULL);
        }
        return 0;
}

static int cc_set_hash_buf(struct device *dev, struct ahash_req_ctx *areq_ctx,
                           u8 *curr_buff, u32 curr_buff_cnt,
                           struct buffer_array *sg_data)
{
        dev_dbg(dev, " handle curr buff %x set to   DLLI\n", curr_buff_cnt);
        /* create sg for the current buffer */
        sg_init_one(areq_ctx->buff_sg, curr_buff, curr_buff_cnt);
        if (dma_map_sg(dev, areq_ctx->buff_sg, 1, DMA_TO_DEVICE) != 1) {
                dev_err(dev, "dma_map_sg() src buffer failed\n");
                return -ENOMEM;
        }
        dev_dbg(dev, "Mapped curr_buff: dma_address=%pad page=%p addr=%p offset=%u length=%u\n",
                &sg_dma_address(areq_ctx->buff_sg), sg_page(areq_ctx->buff_sg),
                sg_virt(areq_ctx->buff_sg), areq_ctx->buff_sg->offset,
                areq_ctx->buff_sg->length);
        areq_ctx->data_dma_buf_type = CC_DMA_BUF_DLLI;
        areq_ctx->curr_sg = areq_ctx->buff_sg;
        areq_ctx->in_nents = 0;
        /* prepare for case of MLLI */
        cc_add_sg_entry(dev, sg_data, 1, areq_ctx->buff_sg, curr_buff_cnt, 0,
                        false, NULL);
        return 0;
}

void cc_unmap_cipher_request(struct device *dev, void *ctx,
                                unsigned int ivsize, struct scatterlist *src,
                                struct scatterlist *dst)
{
        struct cipher_req_ctx *req_ctx = (struct cipher_req_ctx *)ctx;

        if (req_ctx->gen_ctx.iv_dma_addr) {
                dev_dbg(dev, "Unmapped iv: iv_dma_addr=%pad iv_size=%u\n",
                        &req_ctx->gen_ctx.iv_dma_addr, ivsize);
                dma_unmap_single(dev, req_ctx->gen_ctx.iv_dma_addr,
                                 ivsize, DMA_BIDIRECTIONAL);
        }
        /* Release pool */
        if (req_ctx->dma_buf_type == CC_DMA_BUF_MLLI &&
            req_ctx->mlli_params.mlli_virt_addr) {
                dma_pool_free(req_ctx->mlli_params.curr_pool,
                              req_ctx->mlli_params.mlli_virt_addr,
                              req_ctx->mlli_params.mlli_dma_addr);
        }

        if (src != dst) {
                dma_unmap_sg(dev, src, req_ctx->in_nents, DMA_TO_DEVICE);
                dma_unmap_sg(dev, dst, req_ctx->out_nents, DMA_FROM_DEVICE);
                dev_dbg(dev, "Unmapped req->dst=%p\n", sg_virt(dst));
                dev_dbg(dev, "Unmapped req->src=%p\n", sg_virt(src));
        } else {
                dma_unmap_sg(dev, src, req_ctx->in_nents, DMA_BIDIRECTIONAL);
                dev_dbg(dev, "Unmapped req->src=%p\n", sg_virt(src));
        }
}

int cc_map_cipher_request(struct cc_drvdata *drvdata, void *ctx,
                          unsigned int ivsize, unsigned int nbytes,
                          void *info, struct scatterlist *src,
                          struct scatterlist *dst, gfp_t flags)
{
        struct cipher_req_ctx *req_ctx = (struct cipher_req_ctx *)ctx;
        struct mlli_params *mlli_params = &req_ctx->mlli_params;
        struct device *dev = drvdata_to_dev(drvdata);
        struct buffer_array sg_data;
        u32 dummy = 0;
        int rc = 0;
        u32 mapped_nents = 0;
        int src_direction = (src != dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL);

        req_ctx->dma_buf_type = CC_DMA_BUF_DLLI;
        mlli_params->curr_pool = NULL;
        sg_data.num_of_buffers = 0;

        /* Map IV buffer */
        if (ivsize) {
                dump_byte_array("iv", info, ivsize);
                req_ctx->gen_ctx.iv_dma_addr =
                        dma_map_single(dev, info, ivsize, DMA_BIDIRECTIONAL);
                if (dma_mapping_error(dev, req_ctx->gen_ctx.iv_dma_addr)) {
                        dev_err(dev, "Mapping iv %u B at va=%p for DMA failed\n",
                                ivsize, info);
                        return -ENOMEM;
                }
                dev_dbg(dev, "Mapped iv %u B at va=%p to dma=%pad\n",
                        ivsize, info, &req_ctx->gen_ctx.iv_dma_addr);
        } else {
                req_ctx->gen_ctx.iv_dma_addr = 0;
        }

        /* Map the src SGL */
        rc = cc_map_sg(dev, src, nbytes, src_direction, &req_ctx->in_nents,
                       LLI_MAX_NUM_OF_DATA_ENTRIES, &dummy, &mapped_nents);
        if (rc)
                goto cipher_exit;
        if (mapped_nents > 1)
                req_ctx->dma_buf_type = CC_DMA_BUF_MLLI;

        if (src == dst) {
                /* Handle inplace operation */
                if (req_ctx->dma_buf_type == CC_DMA_BUF_MLLI) {
                        req_ctx->out_nents = 0;
                        cc_add_sg_entry(dev, &sg_data, req_ctx->in_nents, src,
                                        nbytes, 0, true,
                                        &req_ctx->in_mlli_nents);
                }
        } else {
                /* Map the dst sg */
                rc = cc_map_sg(dev, dst, nbytes, DMA_FROM_DEVICE,
                               &req_ctx->out_nents, LLI_MAX_NUM_OF_DATA_ENTRIES,
                               &dummy, &mapped_nents);
                if (rc)
                        goto cipher_exit;
                if (mapped_nents > 1)
                        req_ctx->dma_buf_type = CC_DMA_BUF_MLLI;

                if (req_ctx->dma_buf_type == CC_DMA_BUF_MLLI) {
                        cc_add_sg_entry(dev, &sg_data, req_ctx->in_nents, src,
                                        nbytes, 0, true,
                                        &req_ctx->in_mlli_nents);
                        cc_add_sg_entry(dev, &sg_data, req_ctx->out_nents, dst,
                                        nbytes, 0, true,
                                        &req_ctx->out_mlli_nents);
                }
        }

        if (req_ctx->dma_buf_type == CC_DMA_BUF_MLLI) {
                mlli_params->curr_pool = drvdata->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;
}

void cc_unmap_aead_request(struct device *dev, struct aead_request *req)
{
        struct aead_req_ctx *areq_ctx = aead_request_ctx_dma(req);
        unsigned int hw_iv_size = areq_ctx->hw_iv_size;
        struct cc_drvdata *drvdata = dev_get_drvdata(dev);
        int src_direction = (req->src != req->dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL);

        if (areq_ctx->mac_buf_dma_addr) {
                dma_unmap_single(dev, areq_ctx->mac_buf_dma_addr,
                                 MAX_MAC_SIZE, DMA_BIDIRECTIONAL);
        }

        if (areq_ctx->cipher_mode == DRV_CIPHER_GCTR) {
                if (areq_ctx->hkey_dma_addr) {
                        dma_unmap_single(dev, areq_ctx->hkey_dma_addr,
                                         AES_BLOCK_SIZE, DMA_BIDIRECTIONAL);
                }

                if (areq_ctx->gcm_block_len_dma_addr) {
                        dma_unmap_single(dev, areq_ctx->gcm_block_len_dma_addr,
                                         AES_BLOCK_SIZE, DMA_TO_DEVICE);
                }

                if (areq_ctx->gcm_iv_inc1_dma_addr) {
                        dma_unmap_single(dev, areq_ctx->gcm_iv_inc1_dma_addr,
                                         AES_BLOCK_SIZE, DMA_TO_DEVICE);
                }

                if (areq_ctx->gcm_iv_inc2_dma_addr) {
                        dma_unmap_single(dev, areq_ctx->gcm_iv_inc2_dma_addr,
                                         AES_BLOCK_SIZE, DMA_TO_DEVICE);
                }
        }

        if (areq_ctx->ccm_hdr_size != ccm_header_size_null) {
                if (areq_ctx->ccm_iv0_dma_addr) {
                        dma_unmap_single(dev, areq_ctx->ccm_iv0_dma_addr,
                                         AES_BLOCK_SIZE, DMA_TO_DEVICE);
                }

                dma_unmap_sg(dev, &areq_ctx->ccm_adata_sg, 1, DMA_TO_DEVICE);
        }
        if (areq_ctx->gen_ctx.iv_dma_addr) {
                dma_unmap_single(dev, areq_ctx->gen_ctx.iv_dma_addr,
                                 hw_iv_size, DMA_BIDIRECTIONAL);
                kfree_sensitive(areq_ctx->gen_ctx.iv);
        }

        /* Release pool */
        if ((areq_ctx->assoc_buff_type == CC_DMA_BUF_MLLI ||
             areq_ctx->data_buff_type == CC_DMA_BUF_MLLI) &&
            (areq_ctx->mlli_params.mlli_virt_addr)) {
                dev_dbg(dev, "free MLLI buffer: dma=%pad virt=%p\n",
                        &areq_ctx->mlli_params.mlli_dma_addr,
                        areq_ctx->mlli_params.mlli_virt_addr);
                dma_pool_free(areq_ctx->mlli_params.curr_pool,
                              areq_ctx->mlli_params.mlli_virt_addr,
                              areq_ctx->mlli_params.mlli_dma_addr);
        }

        dev_dbg(dev, "Unmapping src sgl: req->src=%p areq_ctx->src.nents=%u areq_ctx->assoc.nents=%u assoclen:%u cryptlen=%u\n",
                sg_virt(req->src), areq_ctx->src.nents, areq_ctx->assoc.nents,
                areq_ctx->assoclen, req->cryptlen);

        dma_unmap_sg(dev, req->src, areq_ctx->src.mapped_nents, src_direction);
        if (req->src != req->dst) {
                dev_dbg(dev, "Unmapping dst sgl: req->dst=%p\n",
                        sg_virt(req->dst));
                dma_unmap_sg(dev, req->dst, areq_ctx->dst.mapped_nents, DMA_FROM_DEVICE);
        }
        if (drvdata->coherent &&
            areq_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_DECRYPT &&
            req->src == req->dst) {
                /* copy back mac from temporary location to deal with possible
                 * data memory overriding that caused by cache coherence
                 * problem.
                 */
                cc_copy_mac(dev, req, CC_SG_FROM_BUF);
        }
}

static bool cc_is_icv_frag(unsigned int sgl_nents, unsigned int authsize,
                           u32 last_entry_data_size)
{
        return ((sgl_nents > 1) && (last_entry_data_size < authsize));
}

static int cc_aead_chain_iv(struct cc_drvdata *drvdata,
                            struct aead_request *req,
                            struct buffer_array *sg_data,
                            bool is_last, bool do_chain)
{
        struct aead_req_ctx *areq_ctx = aead_request_ctx_dma(req);
        unsigned int hw_iv_size = areq_ctx->hw_iv_size;
        struct device *dev = drvdata_to_dev(drvdata);
        gfp_t flags = cc_gfp_flags(&req->base);
        int rc = 0;

        if (!req->iv) {
                areq_ctx->gen_ctx.iv_dma_addr = 0;
                areq_ctx->gen_ctx.iv = NULL;
                goto chain_iv_exit;
        }

        areq_ctx->gen_ctx.iv = kmemdup(req->iv, hw_iv_size, flags);
        if (!areq_ctx->gen_ctx.iv)
                return -ENOMEM;

        areq_ctx->gen_ctx.iv_dma_addr =
                dma_map_single(dev, areq_ctx->gen_ctx.iv, hw_iv_size,
                               DMA_BIDIRECTIONAL);
        if (dma_mapping_error(dev, areq_ctx->gen_ctx.iv_dma_addr)) {
                dev_err(dev, "Mapping iv %u B at va=%p for DMA failed\n",
                        hw_iv_size, req->iv);
                kfree_sensitive(areq_ctx->gen_ctx.iv);
                areq_ctx->gen_ctx.iv = NULL;
                rc = -ENOMEM;
                goto chain_iv_exit;
        }

        dev_dbg(dev, "Mapped iv %u B at va=%p to dma=%pad\n",
                hw_iv_size, req->iv, &areq_ctx->gen_ctx.iv_dma_addr);

chain_iv_exit:
        return rc;
}

static int cc_aead_chain_assoc(struct cc_drvdata *drvdata,
                               struct aead_request *req,
                               struct buffer_array *sg_data,
                               bool is_last, bool do_chain)
{
        struct aead_req_ctx *areq_ctx = aead_request_ctx_dma(req);
        int rc = 0;
        int mapped_nents = 0;
        struct device *dev = drvdata_to_dev(drvdata);

        if (!sg_data) {
                rc = -EINVAL;
                goto chain_assoc_exit;
        }

        if (areq_ctx->assoclen == 0) {
                areq_ctx->assoc_buff_type = CC_DMA_BUF_NULL;
                areq_ctx->assoc.nents = 0;
                areq_ctx->assoc.mlli_nents = 0;
                dev_dbg(dev, "Chain assoc of length 0: buff_type=%s nents=%u\n",
                        cc_dma_buf_type(areq_ctx->assoc_buff_type),
                        areq_ctx->assoc.nents);
                goto chain_assoc_exit;
        }

        mapped_nents = sg_nents_for_len(req->src, areq_ctx->assoclen);
        if (mapped_nents < 0)
                return mapped_nents;

        if (mapped_nents > LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES) {
                dev_err(dev, "Too many fragments. current %d max %d\n",
                        mapped_nents, LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES);
                return -ENOMEM;
        }
        areq_ctx->assoc.nents = mapped_nents;

        /* in CCM case we have additional entry for
         * ccm header configurations
         */
        if (areq_ctx->ccm_hdr_size != ccm_header_size_null) {
                if ((mapped_nents + 1) > LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES) {
                        dev_err(dev, "CCM case.Too many fragments. Current %d max %d\n",
                                (areq_ctx->assoc.nents + 1),
                                LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES);
                        rc = -ENOMEM;
                        goto chain_assoc_exit;
                }
        }

        if (mapped_nents == 1 && areq_ctx->ccm_hdr_size == ccm_header_size_null)
                areq_ctx->assoc_buff_type = CC_DMA_BUF_DLLI;
        else
                areq_ctx->assoc_buff_type = CC_DMA_BUF_MLLI;

        if (do_chain || areq_ctx->assoc_buff_type == CC_DMA_BUF_MLLI) {
                dev_dbg(dev, "Chain assoc: buff_type=%s nents=%u\n",
                        cc_dma_buf_type(areq_ctx->assoc_buff_type),
                        areq_ctx->assoc.nents);
                cc_add_sg_entry(dev, sg_data, areq_ctx->assoc.nents, req->src,
                                areq_ctx->assoclen, 0, is_last,
                                &areq_ctx->assoc.mlli_nents);
                areq_ctx->assoc_buff_type = CC_DMA_BUF_MLLI;
        }

chain_assoc_exit:
        return rc;
}

static void cc_prepare_aead_data_dlli(struct aead_request *req,
                                      u32 *src_last_bytes, u32 *dst_last_bytes)
{
        struct aead_req_ctx *areq_ctx = aead_request_ctx_dma(req);
        enum drv_crypto_direction direct = areq_ctx->gen_ctx.op_type;
        unsigned int authsize = areq_ctx->req_authsize;
        struct scatterlist *sg;
        ssize_t offset;

        areq_ctx->is_icv_fragmented = false;

        if ((req->src == req->dst) || direct == DRV_CRYPTO_DIRECTION_DECRYPT) {
                sg = areq_ctx->src_sgl;
                offset = *src_last_bytes - authsize;
        } else {
                sg = areq_ctx->dst_sgl;
                offset = *dst_last_bytes - authsize;
        }

        areq_ctx->icv_dma_addr = sg_dma_address(sg) + offset;
        areq_ctx->icv_virt_addr = sg_virt(sg) + offset;
}

static void cc_prepare_aead_data_mlli(struct cc_drvdata *drvdata,
                                      struct aead_request *req,
                                      struct buffer_array *sg_data,
                                      u32 *src_last_bytes, u32 *dst_last_bytes,
                                      bool is_last_table)
{
        struct aead_req_ctx *areq_ctx = aead_request_ctx_dma(req);
        enum drv_crypto_direction direct = areq_ctx->gen_ctx.op_type;
        unsigned int authsize = areq_ctx->req_authsize;
        struct device *dev = drvdata_to_dev(drvdata);
        struct scatterlist *sg;

        if (req->src == req->dst) {
                /*INPLACE*/
                cc_add_sg_entry(dev, sg_data, areq_ctx->src.nents,
                                areq_ctx->src_sgl, areq_ctx->cryptlen,
                                areq_ctx->src_offset, is_last_table,
                                &areq_ctx->src.mlli_nents);

                areq_ctx->is_icv_fragmented =
                        cc_is_icv_frag(areq_ctx->src.nents, authsize,
                                       *src_last_bytes);

                if (areq_ctx->is_icv_fragmented) {
                        /* Backup happens only when ICV is fragmented, ICV
                         * verification is made by CPU compare in order to
                         * simplify MAC verification upon request completion
                         */
                        if (direct == DRV_CRYPTO_DIRECTION_DECRYPT) {
                                /* In coherent platforms (e.g. ACP)
                                 * already copying ICV for any
                                 * INPLACE-DECRYPT operation, hence
                                 * we must neglect this code.
                                 */
                                if (!drvdata->coherent)
                                        cc_copy_mac(dev, req, CC_SG_TO_BUF);

                                areq_ctx->icv_virt_addr = areq_ctx->backup_mac;
                        } else {
                                areq_ctx->icv_virt_addr = areq_ctx->mac_buf;
                                areq_ctx->icv_dma_addr =
                                        areq_ctx->mac_buf_dma_addr;
                        }
                } else { /* Contig. ICV */
                        sg = &areq_ctx->src_sgl[areq_ctx->src.nents - 1];
                        /*Should hanlde if the sg is not contig.*/
                        areq_ctx->icv_dma_addr = sg_dma_address(sg) +
                                (*src_last_bytes - authsize);
                        areq_ctx->icv_virt_addr = sg_virt(sg) +
                                (*src_last_bytes - authsize);
                }

        } else if (direct == DRV_CRYPTO_DIRECTION_DECRYPT) {
                /*NON-INPLACE and DECRYPT*/
                cc_add_sg_entry(dev, sg_data, areq_ctx->src.nents,
                                areq_ctx->src_sgl, areq_ctx->cryptlen,
                                areq_ctx->src_offset, is_last_table,
                                &areq_ctx->src.mlli_nents);
                cc_add_sg_entry(dev, sg_data, areq_ctx->dst.nents,
                                areq_ctx->dst_sgl, areq_ctx->cryptlen,
                                areq_ctx->dst_offset, is_last_table,
                                &areq_ctx->dst.mlli_nents);

                areq_ctx->is_icv_fragmented =
                        cc_is_icv_frag(areq_ctx->src.nents, authsize,
                                       *src_last_bytes);
                /* Backup happens only when ICV is fragmented, ICV

                 * verification is made by CPU compare in order to simplify
                 * MAC verification upon request completion
                 */
                if (areq_ctx->is_icv_fragmented) {
                        cc_copy_mac(dev, req, CC_SG_TO_BUF);
                        areq_ctx->icv_virt_addr = areq_ctx->backup_mac;

                } else { /* Contig. ICV */
                        sg = &areq_ctx->src_sgl[areq_ctx->src.nents - 1];
                        /*Should hanlde if the sg is not contig.*/
                        areq_ctx->icv_dma_addr = sg_dma_address(sg) +
                                (*src_last_bytes - authsize);
                        areq_ctx->icv_virt_addr = sg_virt(sg) +
                                (*src_last_bytes - authsize);
                }

        } else {
                /*NON-INPLACE and ENCRYPT*/
                cc_add_sg_entry(dev, sg_data, areq_ctx->dst.nents,
                                areq_ctx->dst_sgl, areq_ctx->cryptlen,
                                areq_ctx->dst_offset, is_last_table,
                                &areq_ctx->dst.mlli_nents);
                cc_add_sg_entry(dev, sg_data, areq_ctx->src.nents,
                                areq_ctx->src_sgl, areq_ctx->cryptlen,
                                areq_ctx->src_offset, is_last_table,
                                &areq_ctx->src.mlli_nents);

                areq_ctx->is_icv_fragmented =
                        cc_is_icv_frag(areq_ctx->dst.nents, authsize,
                                       *dst_last_bytes);

                if (!areq_ctx->is_icv_fragmented) {
                        sg = &areq_ctx->dst_sgl[areq_ctx->dst.nents - 1];
                        /* Contig. ICV */
                        areq_ctx->icv_dma_addr = sg_dma_address(sg) +
                                (*dst_last_bytes - authsize);
                        areq_ctx->icv_virt_addr = sg_virt(sg) +
                                (*dst_last_bytes - authsize);
                } else {
                        areq_ctx->icv_dma_addr = areq_ctx->mac_buf_dma_addr;
                        areq_ctx->icv_virt_addr = areq_ctx->mac_buf;
                }
        }
}

static int cc_aead_chain_data(struct cc_drvdata *drvdata,
                              struct aead_request *req,
                              struct buffer_array *sg_data,
                              bool is_last_table, bool do_chain)
{
        struct aead_req_ctx *areq_ctx = aead_request_ctx_dma(req);
        struct device *dev = drvdata_to_dev(drvdata);
        enum drv_crypto_direction direct = areq_ctx->gen_ctx.op_type;
        unsigned int authsize = areq_ctx->req_authsize;
        unsigned int src_last_bytes = 0, dst_last_bytes = 0;
        int rc = 0;
        u32 src_mapped_nents = 0, dst_mapped_nents = 0;
        u32 offset = 0;
        /* non-inplace mode */
        unsigned int size_for_map = req->assoclen + req->cryptlen;
        u32 sg_index = 0;
        u32 size_to_skip = req->assoclen;
        struct scatterlist *sgl;

        offset = size_to_skip;

        if (!sg_data)
                return -EINVAL;

        areq_ctx->src_sgl = req->src;
        areq_ctx->dst_sgl = req->dst;

        size_for_map += (direct == DRV_CRYPTO_DIRECTION_ENCRYPT) ?
                        authsize : 0;
        src_mapped_nents = cc_get_sgl_nents(dev, req->src, size_for_map,
                                            &src_last_bytes);
        sg_index = areq_ctx->src_sgl->length;
        //check where the data starts
        while (src_mapped_nents && (sg_index <= size_to_skip)) {
                src_mapped_nents--;
                offset -= areq_ctx->src_sgl->length;
                sgl = sg_next(areq_ctx->src_sgl);
                if (!sgl)
                        break;
                areq_ctx->src_sgl = sgl;
                sg_index += areq_ctx->src_sgl->length;
        }
        if (src_mapped_nents > LLI_MAX_NUM_OF_DATA_ENTRIES) {
                dev_err(dev, "Too many fragments. current %d max %d\n",
                        src_mapped_nents, LLI_MAX_NUM_OF_DATA_ENTRIES);
                return -ENOMEM;
        }

        areq_ctx->src.nents = src_mapped_nents;

        areq_ctx->src_offset = offset;

        if (req->src != req->dst) {
                size_for_map = req->assoclen + req->cryptlen;

                if (direct == DRV_CRYPTO_DIRECTION_ENCRYPT)
                        size_for_map += authsize;
                else
                        size_for_map -= authsize;

                rc = cc_map_sg(dev, req->dst, size_for_map, DMA_FROM_DEVICE,
                               &areq_ctx->dst.mapped_nents,
                               LLI_MAX_NUM_OF_DATA_ENTRIES, &dst_last_bytes,
                               &dst_mapped_nents);
                if (rc)
                        goto chain_data_exit;
        }

        dst_mapped_nents = cc_get_sgl_nents(dev, req->dst, size_for_map,
                                            &dst_last_bytes);
        sg_index = areq_ctx->dst_sgl->length;
        offset = size_to_skip;

        //check where the data starts
        while (dst_mapped_nents && sg_index <= size_to_skip) {
                dst_mapped_nents--;
                offset -= areq_ctx->dst_sgl->length;
                sgl = sg_next(areq_ctx->dst_sgl);
                if (!sgl)
                        break;
                areq_ctx->dst_sgl = sgl;
                sg_index += areq_ctx->dst_sgl->length;
        }
        if (dst_mapped_nents > LLI_MAX_NUM_OF_DATA_ENTRIES) {
                dev_err(dev, "Too many fragments. current %d max %d\n",
                        dst_mapped_nents, LLI_MAX_NUM_OF_DATA_ENTRIES);
                return -ENOMEM;
        }
        areq_ctx->dst.nents = dst_mapped_nents;
        areq_ctx->dst_offset = offset;
        if (src_mapped_nents > 1 ||
            dst_mapped_nents  > 1 ||
            do_chain) {
                areq_ctx->data_buff_type = CC_DMA_BUF_MLLI;
                cc_prepare_aead_data_mlli(drvdata, req, sg_data,
                                          &src_last_bytes, &dst_last_bytes,
                                          is_last_table);
        } else {
                areq_ctx->data_buff_type = CC_DMA_BUF_DLLI;
                cc_prepare_aead_data_dlli(req, &src_last_bytes,
                                          &dst_last_bytes);
        }

chain_data_exit:
        return rc;
}

static void cc_update_aead_mlli_nents(struct cc_drvdata *drvdata,
                                      struct aead_request *req)
{
        struct aead_req_ctx *areq_ctx = aead_request_ctx_dma(req);
        u32 curr_mlli_size = 0;

        if (areq_ctx->assoc_buff_type == CC_DMA_BUF_MLLI) {
                areq_ctx->assoc.sram_addr = drvdata->mlli_sram_addr;
                curr_mlli_size = areq_ctx->assoc.mlli_nents *
                                                LLI_ENTRY_BYTE_SIZE;
        }

        if (areq_ctx->data_buff_type == CC_DMA_BUF_MLLI) {
                /*Inplace case dst nents equal to src nents*/
                if (req->src == req->dst) {
                        areq_ctx->dst.mlli_nents = areq_ctx->src.mlli_nents;
                        areq_ctx->src.sram_addr = drvdata->mlli_sram_addr +
                                                                curr_mlli_size;
                        areq_ctx->dst.sram_addr = areq_ctx->src.sram_addr;
                        if (!areq_ctx->is_single_pass)
                                areq_ctx->assoc.mlli_nents +=
                                        areq_ctx->src.mlli_nents;
                } else {
                        if (areq_ctx->gen_ctx.op_type ==
                                        DRV_CRYPTO_DIRECTION_DECRYPT) {
                                areq_ctx->src.sram_addr =
                                                drvdata->mlli_sram_addr +
                                                                curr_mlli_size;
                                areq_ctx->dst.sram_addr =
                                                areq_ctx->src.sram_addr +
                                                areq_ctx->src.mlli_nents *
                                                LLI_ENTRY_BYTE_SIZE;
                                if (!areq_ctx->is_single_pass)
                                        areq_ctx->assoc.mlli_nents +=
                                                areq_ctx->src.mlli_nents;
                        } else {
                                areq_ctx->dst.sram_addr =
                                                drvdata->mlli_sram_addr +
                                                                curr_mlli_size;
                                areq_ctx->src.sram_addr =
                                                areq_ctx->dst.sram_addr +
                                                areq_ctx->dst.mlli_nents *
                                                LLI_ENTRY_BYTE_SIZE;
                                if (!areq_ctx->is_single_pass)
                                        areq_ctx->assoc.mlli_nents +=
                                                areq_ctx->dst.mlli_nents;
                        }
                }
        }
}

int cc_map_aead_request(struct cc_drvdata *drvdata, struct aead_request *req)
{
        struct aead_req_ctx *areq_ctx = aead_request_ctx_dma(req);
        struct mlli_params *mlli_params = &areq_ctx->mlli_params;
        struct device *dev = drvdata_to_dev(drvdata);
        struct buffer_array sg_data;
        unsigned int authsize = areq_ctx->req_authsize;
        int rc = 0;
        dma_addr_t dma_addr;
        u32 mapped_nents = 0;
        u32 dummy = 0; /*used for the assoc data fragments */
        u32 size_to_map;
        gfp_t flags = cc_gfp_flags(&req->base);

        mlli_params->curr_pool = NULL;
        sg_data.num_of_buffers = 0;

        /* copy mac to a temporary location to deal with possible
         * data memory overriding that caused by cache coherence problem.
         */
        if (drvdata->coherent &&
            areq_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_DECRYPT &&
            req->src == req->dst)
                cc_copy_mac(dev, req, CC_SG_TO_BUF);

        /* cacluate the size for cipher remove ICV in decrypt*/
        areq_ctx->cryptlen = (areq_ctx->gen_ctx.op_type ==
                                 DRV_CRYPTO_DIRECTION_ENCRYPT) ?
                                req->cryptlen :
                                (req->cryptlen - authsize);

        dma_addr = dma_map_single(dev, areq_ctx->mac_buf, MAX_MAC_SIZE,
                                  DMA_BIDIRECTIONAL);
        if (dma_mapping_error(dev, dma_addr)) {
                dev_err(dev, "Mapping mac_buf %u B at va=%p for DMA failed\n",
                        MAX_MAC_SIZE, areq_ctx->mac_buf);
                rc = -ENOMEM;
                goto aead_map_failure;
        }
        areq_ctx->mac_buf_dma_addr = dma_addr;

        if (areq_ctx->ccm_hdr_size != ccm_header_size_null) {
                void *addr = areq_ctx->ccm_config + CCM_CTR_COUNT_0_OFFSET;

                dma_addr = dma_map_single(dev, addr, AES_BLOCK_SIZE,
                                          DMA_TO_DEVICE);

                if (dma_mapping_error(dev, dma_addr)) {
                        dev_err(dev, "Mapping mac_buf %u B at va=%p for DMA failed\n",
                                AES_BLOCK_SIZE, addr);
                        areq_ctx->ccm_iv0_dma_addr = 0;
                        rc = -ENOMEM;
                        goto aead_map_failure;
                }
                areq_ctx->ccm_iv0_dma_addr = dma_addr;

                rc = cc_set_aead_conf_buf(dev, areq_ctx, areq_ctx->ccm_config,
                                          &sg_data, areq_ctx->assoclen);
                if (rc)
                        goto aead_map_failure;
        }

        if (areq_ctx->cipher_mode == DRV_CIPHER_GCTR) {
                dma_addr = dma_map_single(dev, areq_ctx->hkey, AES_BLOCK_SIZE,
                                          DMA_BIDIRECTIONAL);
                if (dma_mapping_error(dev, dma_addr)) {
                        dev_err(dev, "Mapping hkey %u B at va=%p for DMA failed\n",
                                AES_BLOCK_SIZE, areq_ctx->hkey);
                        rc = -ENOMEM;
                        goto aead_map_failure;
                }
                areq_ctx->hkey_dma_addr = dma_addr;

                dma_addr = dma_map_single(dev, &areq_ctx->gcm_len_block,
                                          AES_BLOCK_SIZE, DMA_TO_DEVICE);
                if (dma_mapping_error(dev, dma_addr)) {
                        dev_err(dev, "Mapping gcm_len_block %u B at va=%p for DMA failed\n",
                                AES_BLOCK_SIZE, &areq_ctx->gcm_len_block);
                        rc = -ENOMEM;
                        goto aead_map_failure;
                }
                areq_ctx->gcm_block_len_dma_addr = dma_addr;

                dma_addr = dma_map_single(dev, areq_ctx->gcm_iv_inc1,
                                          AES_BLOCK_SIZE, DMA_TO_DEVICE);

                if (dma_mapping_error(dev, dma_addr)) {
                        dev_err(dev, "Mapping gcm_iv_inc1 %u B at va=%p for DMA failed\n",
                                AES_BLOCK_SIZE, (areq_ctx->gcm_iv_inc1));
                        areq_ctx->gcm_iv_inc1_dma_addr = 0;
                        rc = -ENOMEM;
                        goto aead_map_failure;
                }
                areq_ctx->gcm_iv_inc1_dma_addr = dma_addr;

                dma_addr = dma_map_single(dev, areq_ctx->gcm_iv_inc2,
                                          AES_BLOCK_SIZE, DMA_TO_DEVICE);

                if (dma_mapping_error(dev, dma_addr)) {
                        dev_err(dev, "Mapping gcm_iv_inc2 %u B at va=%p for DMA failed\n",
                                AES_BLOCK_SIZE, (areq_ctx->gcm_iv_inc2));
                        areq_ctx->gcm_iv_inc2_dma_addr = 0;
                        rc = -ENOMEM;
                        goto aead_map_failure;
                }
                areq_ctx->gcm_iv_inc2_dma_addr = dma_addr;
        }

        size_to_map = req->cryptlen + req->assoclen;
        /* If we do in-place encryption, we also need the auth tag */
        if ((areq_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_ENCRYPT) &&
           (req->src == req->dst)) {
                size_to_map += authsize;
        }

        rc = cc_map_sg(dev, req->src, size_to_map,
                       (req->src != req->dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL),
                       &areq_ctx->src.mapped_nents,
                       (LLI_MAX_NUM_OF_ASSOC_DATA_ENTRIES +
                        LLI_MAX_NUM_OF_DATA_ENTRIES),
                       &dummy, &mapped_nents);
        if (rc)
                goto aead_map_failure;

        if (areq_ctx->is_single_pass) {
                /*
                 * Create MLLI table for:
                 *   (1) Assoc. data
                 *   (2) Src/Dst SGLs
                 *   Note: IV is contg. buffer (not an SGL)
                 */
                rc = cc_aead_chain_assoc(drvdata, req, &sg_data, true, false);
                if (rc)
                        goto aead_map_failure;
                rc = cc_aead_chain_iv(drvdata, req, &sg_data, true, false);
                if (rc)
                        goto aead_map_failure;
                rc = cc_aead_chain_data(drvdata, req, &sg_data, true, false);
                if (rc)
                        goto aead_map_failure;
        } else { /* DOUBLE-PASS flow */
                /*
                 * Prepare MLLI table(s) in this order:
                 *
                 * If ENCRYPT/DECRYPT (inplace):
                 *   (1) MLLI table for assoc
                 *   (2) IV entry (chained right after end of assoc)
                 *   (3) MLLI for src/dst (inplace operation)
                 *
                 * If ENCRYPT (non-inplace)
                 *   (1) MLLI table for assoc
                 *   (2) IV entry (chained right after end of assoc)
                 *   (3) MLLI for dst
                 *   (4) MLLI for src
                 *
                 * If DECRYPT (non-inplace)
                 *   (1) MLLI table for assoc
                 *   (2) IV entry (chained right after end of assoc)
                 *   (3) MLLI for src
                 *   (4) MLLI for dst
                 */
                rc = cc_aead_chain_assoc(drvdata, req, &sg_data, false, true);
                if (rc)
                        goto aead_map_failure;
                rc = cc_aead_chain_iv(drvdata, req, &sg_data, false, true);
                if (rc)
                        goto aead_map_failure;
                rc = cc_aead_chain_data(drvdata, req, &sg_data, true, true);
                if (rc)
                        goto aead_map_failure;
        }

        /* Mlli support -start building the MLLI according to the above
         * results
         */
        if (areq_ctx->assoc_buff_type == CC_DMA_BUF_MLLI ||
            areq_ctx->data_buff_type == CC_DMA_BUF_MLLI) {
                mlli_params->curr_pool = drvdata->mlli_buffs_pool;
                rc = cc_generate_mlli(dev, &sg_data, mlli_params, flags);
                if (rc)
                        goto aead_map_failure;

                cc_update_aead_mlli_nents(drvdata, req);
                dev_dbg(dev, "assoc params mn %d\n",
                        areq_ctx->assoc.mlli_nents);
                dev_dbg(dev, "src params mn %d\n", areq_ctx->src.mlli_nents);
                dev_dbg(dev, "dst params mn %d\n", areq_ctx->dst.mlli_nents);
        }
        return 0;

aead_map_failure:
        cc_unmap_aead_request(dev, req);
        return rc;
}

int cc_map_hash_request_final(struct cc_drvdata *drvdata, void *ctx,
                              struct scatterlist *src, unsigned int nbytes,
                              bool do_update, gfp_t flags)
{
        struct ahash_req_ctx *areq_ctx = (struct ahash_req_ctx *)ctx;
        struct device *dev = drvdata_to_dev(drvdata);
        u8 *curr_buff = cc_hash_buf(areq_ctx);
        u32 *curr_buff_cnt = cc_hash_buf_cnt(areq_ctx);
        struct mlli_params *mlli_params = &areq_ctx->mlli_params;
        struct buffer_array sg_data;
        int rc = 0;
        u32 dummy = 0;
        u32 mapped_nents = 0;

        dev_dbg(dev, "final params : curr_buff=%p curr_buff_cnt=0x%X nbytes = 0x%X src=%p curr_index=%u\n",
                curr_buff, *curr_buff_cnt, nbytes, src, areq_ctx->buff_index);
        /* Init the type of the dma buffer */
        areq_ctx->data_dma_buf_type = CC_DMA_BUF_NULL;
        mlli_params->curr_pool = NULL;
        sg_data.num_of_buffers = 0;
        areq_ctx->in_nents = 0;

        if (nbytes == 0 && *curr_buff_cnt == 0) {
                /* nothing to do */
                return 0;
        }

        /* map the previous buffer */
        if (*curr_buff_cnt) {
                rc = cc_set_hash_buf(dev, areq_ctx, curr_buff, *curr_buff_cnt,
                                     &sg_data);
                if (rc)
                        return rc;
        }

        if (src && nbytes > 0 && do_update) {
                rc = cc_map_sg(dev, src, nbytes, DMA_TO_DEVICE,
                               &areq_ctx->in_nents, LLI_MAX_NUM_OF_DATA_ENTRIES,
                               &dummy, &mapped_nents);
                if (rc)
                        goto unmap_curr_buff;
                if (src && mapped_nents == 1 &&
                    areq_ctx->data_dma_buf_type == CC_DMA_BUF_NULL) {
                        memcpy(areq_ctx->buff_sg, src,
                               sizeof(struct scatterlist));
                        areq_ctx->buff_sg->length = nbytes;
                        areq_ctx->curr_sg = areq_ctx->buff_sg;
                        areq_ctx->data_dma_buf_type = CC_DMA_BUF_DLLI;
                } else {
                        areq_ctx->data_dma_buf_type = CC_DMA_BUF_MLLI;
                }
        }

        /*build mlli */
        if (areq_ctx->data_dma_buf_type == CC_DMA_BUF_MLLI) {
                mlli_params->curr_pool = drvdata->mlli_buffs_pool;
                /* add the src data to the sg_data */
                cc_add_sg_entry(dev, &sg_data, areq_ctx->in_nents, src, nbytes,
                                0, true, &areq_ctx->mlli_nents);
                rc = cc_generate_mlli(dev, &sg_data, mlli_params, flags);
                if (rc)
                        goto fail_unmap_din;
        }
        /* change the buffer index for the unmap function */
        areq_ctx->buff_index = (areq_ctx->buff_index ^ 1);
        dev_dbg(dev, "areq_ctx->data_dma_buf_type = %s\n",
                cc_dma_buf_type(areq_ctx->data_dma_buf_type));
        return 0;

fail_unmap_din:
        dma_unmap_sg(dev, src, areq_ctx->in_nents, DMA_TO_DEVICE);

unmap_curr_buff:
        if (*curr_buff_cnt)
                dma_unmap_sg(dev, areq_ctx->buff_sg, 1, DMA_TO_DEVICE);

        return rc;
}

int cc_map_hash_request_update(struct cc_drvdata *drvdata, void *ctx,
                               struct scatterlist *src, unsigned int nbytes,
                               unsigned int block_size, gfp_t flags)
{
        struct ahash_req_ctx *areq_ctx = (struct ahash_req_ctx *)ctx;
        struct device *dev = drvdata_to_dev(drvdata);
        u8 *curr_buff = cc_hash_buf(areq_ctx);
        u32 *curr_buff_cnt = cc_hash_buf_cnt(areq_ctx);
        u8 *next_buff = cc_next_buf(areq_ctx);
        u32 *next_buff_cnt = cc_next_buf_cnt(areq_ctx);
        struct mlli_params *mlli_params = &areq_ctx->mlli_params;
        unsigned int update_data_len;
        u32 total_in_len = nbytes + *curr_buff_cnt;
        struct buffer_array sg_data;
        unsigned int swap_index = 0;
        int rc = 0;
        u32 dummy = 0;
        u32 mapped_nents = 0;
        int sg_nents;

        dev_dbg(dev, " update params : curr_buff=%p curr_buff_cnt=0x%X nbytes=0x%X src=%p curr_index=%u\n",
                curr_buff, *curr_buff_cnt, nbytes, src, areq_ctx->buff_index);
        /* Init the type of the dma buffer */
        areq_ctx->data_dma_buf_type = CC_DMA_BUF_NULL;
        mlli_params->curr_pool = NULL;
        areq_ctx->curr_sg = NULL;
        sg_data.num_of_buffers = 0;
        areq_ctx->in_nents = 0;

        if (total_in_len < block_size) {
                dev_dbg(dev, " less than one block: curr_buff=%p *curr_buff_cnt=0x%X copy_to=%p\n",
                        curr_buff, *curr_buff_cnt, &curr_buff[*curr_buff_cnt]);
                sg_nents = sg_nents_for_len(src, nbytes);
                if (sg_nents < 0)
                        return sg_nents;
                areq_ctx->in_nents = sg_nents;
                sg_copy_to_buffer(src, areq_ctx->in_nents,
                                  &curr_buff[*curr_buff_cnt], nbytes);
                *curr_buff_cnt += nbytes;
                return 1;
        }

        /* Calculate the residue size*/
        *next_buff_cnt = total_in_len & (block_size - 1);
        /* update data len */
        update_data_len = total_in_len - *next_buff_cnt;

        dev_dbg(dev, " temp length : *next_buff_cnt=0x%X update_data_len=0x%X\n",
                *next_buff_cnt, update_data_len);

        /* Copy the new residue to next buffer */
        if (*next_buff_cnt) {
                dev_dbg(dev, " handle residue: next buff %p skip data %u residue %u\n",
                        next_buff, (update_data_len - *curr_buff_cnt),
                        *next_buff_cnt);
                cc_copy_sg_portion(dev, next_buff, src,
                                   (update_data_len - *curr_buff_cnt),
                                   nbytes, CC_SG_TO_BUF);
                /* change the buffer index for next operation */
                swap_index = 1;
        }

        if (*curr_buff_cnt) {
                rc = cc_set_hash_buf(dev, areq_ctx, curr_buff, *curr_buff_cnt,
                                     &sg_data);
                if (rc)
                        return rc;
                /* change the buffer index for next operation */
                swap_index = 1;
        }

        if (update_data_len > *curr_buff_cnt) {
                rc = cc_map_sg(dev, src, (update_data_len - *curr_buff_cnt),
                               DMA_TO_DEVICE, &areq_ctx->in_nents,
                               LLI_MAX_NUM_OF_DATA_ENTRIES, &dummy,
                               &mapped_nents);
                if (rc)
                        goto unmap_curr_buff;
                if (mapped_nents == 1 &&
                    areq_ctx->data_dma_buf_type == CC_DMA_BUF_NULL) {
                        /* only one entry in the SG and no previous data */
                        memcpy(areq_ctx->buff_sg, src,
                               sizeof(struct scatterlist));
                        areq_ctx->buff_sg->length = update_data_len;
                        areq_ctx->data_dma_buf_type = CC_DMA_BUF_DLLI;
                        areq_ctx->curr_sg = areq_ctx->buff_sg;
                } else {
                        areq_ctx->data_dma_buf_type = CC_DMA_BUF_MLLI;
                }
        }

        if (areq_ctx->data_dma_buf_type == CC_DMA_BUF_MLLI) {
                mlli_params->curr_pool = drvdata->mlli_buffs_pool;
                /* add the src data to the sg_data */
                cc_add_sg_entry(dev, &sg_data, areq_ctx->in_nents, src,
                                (update_data_len - *curr_buff_cnt), 0, true,
                                &areq_ctx->mlli_nents);
                rc = cc_generate_mlli(dev, &sg_data, mlli_params, flags);
                if (rc)
                        goto fail_unmap_din;
        }
        areq_ctx->buff_index = (areq_ctx->buff_index ^ swap_index);

        return 0;

fail_unmap_din:
        dma_unmap_sg(dev, src, areq_ctx->in_nents, DMA_TO_DEVICE);

unmap_curr_buff:
        if (*curr_buff_cnt)
                dma_unmap_sg(dev, areq_ctx->buff_sg, 1, DMA_TO_DEVICE);

        return rc;
}

void cc_unmap_hash_request(struct device *dev, void *ctx,
                           struct scatterlist *src, bool do_revert)
{
        struct ahash_req_ctx *areq_ctx = (struct ahash_req_ctx *)ctx;
        u32 *prev_len = cc_next_buf_cnt(areq_ctx);

        /*In case a pool was set, a table was
         *allocated and should be released
         */
        if (areq_ctx->mlli_params.curr_pool) {
                dev_dbg(dev, "free MLLI buffer: dma=%pad virt=%p\n",
                        &areq_ctx->mlli_params.mlli_dma_addr,
                        areq_ctx->mlli_params.mlli_virt_addr);
                dma_pool_free(areq_ctx->mlli_params.curr_pool,
                              areq_ctx->mlli_params.mlli_virt_addr,
                              areq_ctx->mlli_params.mlli_dma_addr);
        }

        if (src && areq_ctx->in_nents) {
                dev_dbg(dev, "Unmapped sg src: virt=%p dma=%pad len=0x%X\n",
                        sg_virt(src), &sg_dma_address(src), sg_dma_len(src));
                dma_unmap_sg(dev, src,
                             areq_ctx->in_nents, DMA_TO_DEVICE);
        }

        if (*prev_len) {
                dev_dbg(dev, "Unmapped buffer: areq_ctx->buff_sg=%p dma=%pad len 0x%X\n",
                        sg_virt(areq_ctx->buff_sg),
                        &sg_dma_address(areq_ctx->buff_sg),
                        sg_dma_len(areq_ctx->buff_sg));
                dma_unmap_sg(dev, areq_ctx->buff_sg, 1, DMA_TO_DEVICE);
                if (!do_revert) {
                        /* clean the previous data length for update
                         * operation
                         */
                        *prev_len = 0;
                } else {
                        areq_ctx->buff_index ^= 1;
                }
        }
}

int cc_buffer_mgr_init(struct cc_drvdata *drvdata)
{
        struct device *dev = drvdata_to_dev(drvdata);

        drvdata->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 (!drvdata->mlli_buffs_pool)
                return -ENOMEM;

        return 0;
}

int cc_buffer_mgr_fini(struct cc_drvdata *drvdata)
{
        dma_pool_destroy(drvdata->mlli_buffs_pool);
        return 0;
}