// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
/* Copyright(c) 2014 - 2020 Intel Corporation */
#include <linux/module.h>
#include <crypto/internal/rsa.h>
#include <crypto/internal/akcipher.h>
#include <crypto/akcipher.h>
#include <crypto/kpp.h>
#include <crypto/internal/kpp.h>
#include <crypto/dh.h>
#include <linux/dma-mapping.h>
#include <linux/fips.h>
#include <crypto/scatterwalk.h>
#include "icp_qat_fw_pke.h"
#include "adf_accel_devices.h"
#include "qat_algs_send.h"
#include "adf_transport.h"
#include "adf_common_drv.h"
#include "qat_crypto.h"

static DEFINE_MUTEX(algs_lock);
static unsigned int active_devs;

struct qat_rsa_input_params {
	union {
		struct {
			dma_addr_t m;
			dma_addr_t e;
			dma_addr_t n;
		} enc;
		struct {
			dma_addr_t c;
			dma_addr_t d;
			dma_addr_t n;
		} dec;
		struct {
			dma_addr_t c;
			dma_addr_t p;
			dma_addr_t q;
			dma_addr_t dp;
			dma_addr_t dq;
			dma_addr_t qinv;
		} dec_crt;
		u64 in_tab[8];
	};
} __packed __aligned(64);

struct qat_rsa_output_params {
	union {
		struct {
			dma_addr_t c;
		} enc;
		struct {
			dma_addr_t m;
		} dec;
		u64 out_tab[8];
	};
} __packed __aligned(64);

struct qat_rsa_ctx {
	char *n;
	char *e;
	char *d;
	char *p;
	char *q;
	char *dp;
	char *dq;
	char *qinv;
	dma_addr_t dma_n;
	dma_addr_t dma_e;
	dma_addr_t dma_d;
	dma_addr_t dma_p;
	dma_addr_t dma_q;
	dma_addr_t dma_dp;
	dma_addr_t dma_dq;
	dma_addr_t dma_qinv;
	unsigned int key_sz;
	bool crt_mode;
	struct qat_crypto_instance *inst;
} __packed __aligned(64);

struct qat_dh_input_params {
	union {
		struct {
			dma_addr_t b;
			dma_addr_t xa;
			dma_addr_t p;
		} in;
		struct {
			dma_addr_t xa;
			dma_addr_t p;
		} in_g2;
		u64 in_tab[8];
	};
} __packed __aligned(64);

struct qat_dh_output_params {
	union {
		dma_addr_t r;
		u64 out_tab[8];
	};
} __packed __aligned(64);

struct qat_dh_ctx {
	char *g;
	char *xa;
	char *p;
	dma_addr_t dma_g;
	dma_addr_t dma_xa;
	dma_addr_t dma_p;
	unsigned int p_size;
	bool g2;
	struct qat_crypto_instance *inst;
} __packed __aligned(64);

struct qat_asym_request {
	union {
		struct qat_rsa_input_params rsa;
		struct qat_dh_input_params dh;
	} in;
	union {
		struct qat_rsa_output_params rsa;
		struct qat_dh_output_params dh;
	} out;
	dma_addr_t phy_in;
	dma_addr_t phy_out;
	char *src_align;
	char *dst_align;
	struct icp_qat_fw_pke_request req;
	union {
		struct qat_rsa_ctx *rsa;
		struct qat_dh_ctx *dh;
	} ctx;
	union {
		struct akcipher_request *rsa;
		struct kpp_request *dh;
	} areq;
	int err;
	void (*cb)(struct icp_qat_fw_pke_resp *resp);
	struct qat_alg_req alg_req;
} __aligned(64);

static int qat_alg_send_asym_message(struct qat_asym_request *qat_req,
				     struct qat_crypto_instance *inst,
				     struct crypto_async_request *base)
{
	struct qat_alg_req *alg_req = &qat_req->alg_req;

	alg_req->fw_req = (u32 *)&qat_req->req;
	alg_req->tx_ring = inst->pke_tx;
	alg_req->base = base;
	alg_req->backlog = &inst->backlog;

	return qat_alg_send_message(alg_req);
}

static void qat_dh_cb(struct icp_qat_fw_pke_resp *resp)
{
	struct qat_asym_request *req = (void *)(__force long)resp->opaque;
	struct kpp_request *areq = req->areq.dh;
	struct device *dev = &GET_DEV(req->ctx.dh->inst->accel_dev);
	int err = ICP_QAT_FW_PKE_RESP_PKE_STAT_GET(
				resp->pke_resp_hdr.comn_resp_flags);

	err = (err == ICP_QAT_FW_COMN_STATUS_FLAG_OK) ? 0 : -EINVAL;

	if (areq->src) {
		dma_unmap_single(dev, req->in.dh.in.b, req->ctx.dh->p_size,
				 DMA_TO_DEVICE);
		kfree_sensitive(req->src_align);
	}

	areq->dst_len = req->ctx.dh->p_size;
	if (req->dst_align) {
		scatterwalk_map_and_copy(req->dst_align, areq->dst, 0,
					 areq->dst_len, 1);
		kfree_sensitive(req->dst_align);
	}

	dma_unmap_single(dev, req->out.dh.r, req->ctx.dh->p_size,
			 DMA_FROM_DEVICE);

	dma_unmap_single(dev, req->phy_in, sizeof(struct qat_dh_input_params),
			 DMA_TO_DEVICE);
	dma_unmap_single(dev, req->phy_out,
			 sizeof(struct qat_dh_output_params),
			 DMA_TO_DEVICE);

	kpp_request_complete(areq, err);
}

#define PKE_DH_1536 0x390c1a49
#define PKE_DH_G2_1536 0x2e0b1a3e
#define PKE_DH_2048 0x4d0c1a60
#define PKE_DH_G2_2048 0x3e0b1a55
#define PKE_DH_3072 0x510c1a77
#define PKE_DH_G2_3072 0x3a0b1a6c
#define PKE_DH_4096 0x690c1a8e
#define PKE_DH_G2_4096 0x4a0b1a83

static unsigned long qat_dh_fn_id(unsigned int len, bool g2)
{
	unsigned int bitslen = len << 3;

	switch (bitslen) {
	case 1536:
		return g2 ? PKE_DH_G2_1536 : PKE_DH_1536;
	case 2048:
		return g2 ? PKE_DH_G2_2048 : PKE_DH_2048;
	case 3072:
		return g2 ? PKE_DH_G2_3072 : PKE_DH_3072;
	case 4096:
		return g2 ? PKE_DH_G2_4096 : PKE_DH_4096;
	default:
		return 0;
	}
}

static int qat_dh_compute_value(struct kpp_request *req)
{
	struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
	struct qat_dh_ctx *ctx = kpp_tfm_ctx(tfm);
	struct qat_crypto_instance *inst = ctx->inst;
	struct device *dev = &GET_DEV(inst->accel_dev);
	struct qat_asym_request *qat_req =
			PTR_ALIGN(kpp_request_ctx(req), 64);
	struct icp_qat_fw_pke_request *msg = &qat_req->req;
	gfp_t flags = qat_algs_alloc_flags(&req->base);
	int n_input_params = 0;
	u8 *vaddr;
	int ret;

	if (unlikely(!ctx->xa))
		return -EINVAL;

	if (req->dst_len < ctx->p_size) {
		req->dst_len = ctx->p_size;
		return -EOVERFLOW;
	}

	if (req->src_len > ctx->p_size)
		return -EINVAL;

	memset(msg, '\0', sizeof(*msg));
	ICP_QAT_FW_PKE_HDR_VALID_FLAG_SET(msg->pke_hdr,
					  ICP_QAT_FW_COMN_REQ_FLAG_SET);

	msg->pke_hdr.cd_pars.func_id = qat_dh_fn_id(ctx->p_size,
						    !req->src && ctx->g2);
	if (unlikely(!msg->pke_hdr.cd_pars.func_id))
		return -EINVAL;

	qat_req->cb = qat_dh_cb;
	qat_req->ctx.dh = ctx;
	qat_req->areq.dh = req;
	msg->pke_hdr.service_type = ICP_QAT_FW_COMN_REQ_CPM_FW_PKE;
	msg->pke_hdr.comn_req_flags =
		ICP_QAT_FW_COMN_FLAGS_BUILD(QAT_COMN_PTR_TYPE_FLAT,
					    QAT_COMN_CD_FLD_TYPE_64BIT_ADR);

	/*
	 * If no source is provided use g as base
	 */
	if (req->src) {
		qat_req->in.dh.in.xa = ctx->dma_xa;
		qat_req->in.dh.in.p = ctx->dma_p;
		n_input_params = 3;
	} else {
		if (ctx->g2) {
			qat_req->in.dh.in_g2.xa = ctx->dma_xa;
			qat_req->in.dh.in_g2.p = ctx->dma_p;
			n_input_params = 2;
		} else {
			qat_req->in.dh.in.b = ctx->dma_g;
			qat_req->in.dh.in.xa = ctx->dma_xa;
			qat_req->in.dh.in.p = ctx->dma_p;
			n_input_params = 3;
		}
	}

	ret = -ENOMEM;
	if (req->src) {
		/*
		 * src can be of any size in valid range, but HW expects it to
		 * be the same as modulo p so in case it is different we need
		 * to allocate a new buf and copy src data.
		 * In other case we just need to map the user provided buffer.
		 * Also need to make sure that it is in contiguous buffer.
		 */
		if (sg_is_last(req->src) && req->src_len == ctx->p_size) {
			qat_req->src_align = NULL;
			vaddr = sg_virt(req->src);
		} else {
			int shift = ctx->p_size - req->src_len;

			qat_req->src_align = kzalloc(ctx->p_size, flags);
			if (unlikely(!qat_req->src_align))
				return ret;

			scatterwalk_map_and_copy(qat_req->src_align + shift,
						 req->src, 0, req->src_len, 0);

			vaddr = qat_req->src_align;
		}

		qat_req->in.dh.in.b = dma_map_single(dev, vaddr, ctx->p_size,
						     DMA_TO_DEVICE);
		if (unlikely(dma_mapping_error(dev, qat_req->in.dh.in.b)))
			goto unmap_src;
	}
	/*
	 * dst can be of any size in valid range, but HW expects it to be the
	 * same as modulo m so in case it is different we need to allocate a
	 * new buf and copy src data.
	 * In other case we just need to map the user provided buffer.
	 * Also need to make sure that it is in contiguous buffer.
	 */
	if (sg_is_last(req->dst) && req->dst_len == ctx->p_size) {
		qat_req->dst_align = NULL;
		vaddr = sg_virt(req->dst);
	} else {
		qat_req->dst_align = kzalloc(ctx->p_size, flags);
		if (unlikely(!qat_req->dst_align))
			goto unmap_src;

		vaddr = qat_req->dst_align;
	}
	qat_req->out.dh.r = dma_map_single(dev, vaddr, ctx->p_size,
					   DMA_FROM_DEVICE);
	if (unlikely(dma_mapping_error(dev, qat_req->out.dh.r)))
		goto unmap_dst;

	qat_req->in.dh.in_tab[n_input_params] = 0;
	qat_req->out.dh.out_tab[1] = 0;
	/* Mapping in.in.b or in.in_g2.xa is the same */
	qat_req->phy_in = dma_map_single(dev, &qat_req->in.dh,
					 sizeof(struct qat_dh_input_params),
					 DMA_TO_DEVICE);
	if (unlikely(dma_mapping_error(dev, qat_req->phy_in)))
		goto unmap_dst;

	qat_req->phy_out = dma_map_single(dev, &qat_req->out.dh,
					  sizeof(struct qat_dh_output_params),
					  DMA_TO_DEVICE);
	if (unlikely(dma_mapping_error(dev, qat_req->phy_out)))
		goto unmap_in_params;

	msg->pke_mid.src_data_addr = qat_req->phy_in;
	msg->pke_mid.dest_data_addr = qat_req->phy_out;
	msg->pke_mid.opaque = (u64)(__force long)qat_req;
	msg->input_param_count = n_input_params;
	msg->output_param_count = 1;

	ret = qat_alg_send_asym_message(qat_req, inst, &req->base);
	if (ret == -ENOSPC)
		goto unmap_all;

	return ret;

unmap_all:
	if (!dma_mapping_error(dev, qat_req->phy_out))
		dma_unmap_single(dev, qat_req->phy_out,
				 sizeof(struct qat_dh_output_params),
				 DMA_TO_DEVICE);
unmap_in_params:
	if (!dma_mapping_error(dev, qat_req->phy_in))
		dma_unmap_single(dev, qat_req->phy_in,
				 sizeof(struct qat_dh_input_params),
				 DMA_TO_DEVICE);
unmap_dst:
	if (!dma_mapping_error(dev, qat_req->out.dh.r))
		dma_unmap_single(dev, qat_req->out.dh.r, ctx->p_size,
				 DMA_FROM_DEVICE);
	kfree_sensitive(qat_req->dst_align);
unmap_src:
	if (req->src) {
		if (!dma_mapping_error(dev, qat_req->in.dh.in.b))
			dma_unmap_single(dev, qat_req->in.dh.in.b,
					 ctx->p_size,
					 DMA_TO_DEVICE);
		kfree_sensitive(qat_req->src_align);
	}
	return ret;
}

static int qat_dh_check_params_length(unsigned int p_len)
{
	switch (p_len) {
	case 1536:
	case 2048:
	case 3072:
	case 4096:
		return 0;
	}
	return -EINVAL;
}

static int qat_dh_set_params(struct qat_dh_ctx *ctx, struct dh *params)
{
	struct qat_crypto_instance *inst = ctx->inst;
	struct device *dev = &GET_DEV(inst->accel_dev);

	if (qat_dh_check_params_length(params->p_size << 3))
		return -EINVAL;

	ctx->p_size = params->p_size;
	ctx->p = dma_alloc_coherent(dev, ctx->p_size, &ctx->dma_p, GFP_KERNEL);
	if (!ctx->p)
		return -ENOMEM;
	memcpy(ctx->p, params->p, ctx->p_size);

	/* If g equals 2 don't copy it */
	if (params->g_size == 1 && *(char *)params->g == 0x02) {
		ctx->g2 = true;
		return 0;
	}

	ctx->g = dma_alloc_coherent(dev, ctx->p_size, &ctx->dma_g, GFP_KERNEL);
	if (!ctx->g)
		return -ENOMEM;
	memcpy(ctx->g + (ctx->p_size - params->g_size), params->g,
	       params->g_size);

	return 0;
}

static void qat_dh_clear_ctx(struct device *dev, struct qat_dh_ctx *ctx)
{
	if (ctx->g) {
		memset(ctx->g, 0, ctx->p_size);
		dma_free_coherent(dev, ctx->p_size, ctx->g, ctx->dma_g);
		ctx->g = NULL;
	}
	if (ctx->xa) {
		memset(ctx->xa, 0, ctx->p_size);
		dma_free_coherent(dev, ctx->p_size, ctx->xa, ctx->dma_xa);
		ctx->xa = NULL;
	}
	if (ctx->p) {
		memset(ctx->p, 0, ctx->p_size);
		dma_free_coherent(dev, ctx->p_size, ctx->p, ctx->dma_p);
		ctx->p = NULL;
	}
	ctx->p_size = 0;
	ctx->g2 = false;
}

static int qat_dh_set_secret(struct crypto_kpp *tfm, const void *buf,
			     unsigned int len)
{
	struct qat_dh_ctx *ctx = kpp_tfm_ctx(tfm);
	struct device *dev = &GET_DEV(ctx->inst->accel_dev);
	struct dh params;
	int ret;

	if (crypto_dh_decode_key(buf, len, &params) < 0)
		return -EINVAL;

	/* Free old secret if any */
	qat_dh_clear_ctx(dev, ctx);

	ret = qat_dh_set_params(ctx, &params);
	if (ret < 0)
		goto err_clear_ctx;

	ctx->xa = dma_alloc_coherent(dev, ctx->p_size, &ctx->dma_xa,
				     GFP_KERNEL);
	if (!ctx->xa) {
		ret = -ENOMEM;
		goto err_clear_ctx;
	}
	memcpy(ctx->xa + (ctx->p_size - params.key_size), params.key,
	       params.key_size);

	return 0;

err_clear_ctx:
	qat_dh_clear_ctx(dev, ctx);
	return ret;
}

static unsigned int qat_dh_max_size(struct crypto_kpp *tfm)
{
	struct qat_dh_ctx *ctx = kpp_tfm_ctx(tfm);

	return ctx->p_size;
}

static int qat_dh_init_tfm(struct crypto_kpp *tfm)
{
	struct qat_dh_ctx *ctx = kpp_tfm_ctx(tfm);
	struct qat_crypto_instance *inst =
			qat_crypto_get_instance_node(numa_node_id());

	if (!inst)
		return -EINVAL;

	kpp_set_reqsize(tfm, sizeof(struct qat_asym_request) + 64);

	ctx->p_size = 0;
	ctx->g2 = false;
	ctx->inst = inst;
	return 0;
}

static void qat_dh_exit_tfm(struct crypto_kpp *tfm)
{
	struct qat_dh_ctx *ctx = kpp_tfm_ctx(tfm);
	struct device *dev = &GET_DEV(ctx->inst->accel_dev);

	qat_dh_clear_ctx(dev, ctx);
	qat_crypto_put_instance(ctx->inst);
}

static void qat_rsa_cb(struct icp_qat_fw_pke_resp *resp)
{
	struct qat_asym_request *req = (void *)(__force long)resp->opaque;
	struct akcipher_request *areq = req->areq.rsa;
	struct device *dev = &GET_DEV(req->ctx.rsa->inst->accel_dev);
	int err = ICP_QAT_FW_PKE_RESP_PKE_STAT_GET(
				resp->pke_resp_hdr.comn_resp_flags);

	err = (err == ICP_QAT_FW_COMN_STATUS_FLAG_OK) ? 0 : -EINVAL;

	kfree_sensitive(req->src_align);

	dma_unmap_single(dev, req->in.rsa.enc.m, req->ctx.rsa->key_sz,
			 DMA_TO_DEVICE);

	areq->dst_len = req->ctx.rsa->key_sz;
	if (req->dst_align) {
		scatterwalk_map_and_copy(req->dst_align, areq->dst, 0,
					 areq->dst_len, 1);

		kfree_sensitive(req->dst_align);
	}

	dma_unmap_single(dev, req->out.rsa.enc.c, req->ctx.rsa->key_sz,
			 DMA_FROM_DEVICE);

	dma_unmap_single(dev, req->phy_in, sizeof(struct qat_rsa_input_params),
			 DMA_TO_DEVICE);
	dma_unmap_single(dev, req->phy_out,
			 sizeof(struct qat_rsa_output_params),
			 DMA_TO_DEVICE);

	akcipher_request_complete(areq, err);
}

void qat_alg_asym_callback(void *_resp)
{
	struct icp_qat_fw_pke_resp *resp = _resp;
	struct qat_asym_request *areq = (void *)(__force long)resp->opaque;
	struct qat_instance_backlog *backlog = areq->alg_req.backlog;

	areq->cb(resp);

	qat_alg_send_backlog(backlog);
}

#define PKE_RSA_EP_512 0x1c161b21
#define PKE_RSA_EP_1024 0x35111bf7
#define PKE_RSA_EP_1536 0x4d111cdc
#define PKE_RSA_EP_2048 0x6e111dba
#define PKE_RSA_EP_3072 0x7d111ea3
#define PKE_RSA_EP_4096 0xa5101f7e

static unsigned long qat_rsa_enc_fn_id(unsigned int len)
{
	unsigned int bitslen = len << 3;

	switch (bitslen) {
	case 512:
		return PKE_RSA_EP_512;
	case 1024:
		return PKE_RSA_EP_1024;
	case 1536:
		return PKE_RSA_EP_1536;
	case 2048:
		return PKE_RSA_EP_2048;
	case 3072:
		return PKE_RSA_EP_3072;
	case 4096:
		return PKE_RSA_EP_4096;
	default:
		return 0;
	}
}

#define PKE_RSA_DP1_512 0x1c161b3c
#define PKE_RSA_DP1_1024 0x35111c12
#define PKE_RSA_DP1_1536 0x4d111cf7
#define PKE_RSA_DP1_2048 0x6e111dda
#define PKE_RSA_DP1_3072 0x7d111ebe
#define PKE_RSA_DP1_4096 0xa5101f98

static unsigned long qat_rsa_dec_fn_id(unsigned int len)
{
	unsigned int bitslen = len << 3;

	switch (bitslen) {
	case 512:
		return PKE_RSA_DP1_512;
	case 1024:
		return PKE_RSA_DP1_1024;
	case 1536:
		return PKE_RSA_DP1_1536;
	case 2048:
		return PKE_RSA_DP1_2048;
	case 3072:
		return PKE_RSA_DP1_3072;
	case 4096:
		return PKE_RSA_DP1_4096;
	default:
		return 0;
	}
}

#define PKE_RSA_DP2_512 0x1c131b57
#define PKE_RSA_DP2_1024 0x26131c2d
#define PKE_RSA_DP2_1536 0x45111d12
#define PKE_RSA_DP2_2048 0x59121dfa
#define PKE_RSA_DP2_3072 0x81121ed9
#define PKE_RSA_DP2_4096 0xb1111fb2

static unsigned long qat_rsa_dec_fn_id_crt(unsigned int len)
{
	unsigned int bitslen = len << 3;

	switch (bitslen) {
	case 512:
		return PKE_RSA_DP2_512;
	case 1024:
		return PKE_RSA_DP2_1024;
	case 1536:
		return PKE_RSA_DP2_1536;
	case 2048:
		return PKE_RSA_DP2_2048;
	case 3072:
		return PKE_RSA_DP2_3072;
	case 4096:
		return PKE_RSA_DP2_4096;
	default:
		return 0;
	}
}

static int qat_rsa_enc(struct akcipher_request *req)
{
	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
	struct qat_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
	struct qat_crypto_instance *inst = ctx->inst;
	struct device *dev = &GET_DEV(inst->accel_dev);
	struct qat_asym_request *qat_req =
			PTR_ALIGN(akcipher_request_ctx(req), 64);
	struct icp_qat_fw_pke_request *msg = &qat_req->req;
	gfp_t flags = qat_algs_alloc_flags(&req->base);
	u8 *vaddr;
	int ret;

	if (unlikely(!ctx->n || !ctx->e))
		return -EINVAL;

	if (req->dst_len < ctx->key_sz) {
		req->dst_len = ctx->key_sz;
		return -EOVERFLOW;
	}

	if (req->src_len > ctx->key_sz)
		return -EINVAL;

	memset(msg, '\0', sizeof(*msg));
	ICP_QAT_FW_PKE_HDR_VALID_FLAG_SET(msg->pke_hdr,
					  ICP_QAT_FW_COMN_REQ_FLAG_SET);
	msg->pke_hdr.cd_pars.func_id = qat_rsa_enc_fn_id(ctx->key_sz);
	if (unlikely(!msg->pke_hdr.cd_pars.func_id))
		return -EINVAL;

	qat_req->cb = qat_rsa_cb;
	qat_req->ctx.rsa = ctx;
	qat_req->areq.rsa = req;
	msg->pke_hdr.service_type = ICP_QAT_FW_COMN_REQ_CPM_FW_PKE;
	msg->pke_hdr.comn_req_flags =
		ICP_QAT_FW_COMN_FLAGS_BUILD(QAT_COMN_PTR_TYPE_FLAT,
					    QAT_COMN_CD_FLD_TYPE_64BIT_ADR);

	qat_req->in.rsa.enc.e = ctx->dma_e;
	qat_req->in.rsa.enc.n = ctx->dma_n;
	ret = -ENOMEM;

	/*
	 * src can be of any size in valid range, but HW expects it to be the
	 * same as modulo n so in case it is different we need to allocate a
	 * new buf and copy src data.
	 * In other case we just need to map the user provided buffer.
	 * Also need to make sure that it is in contiguous buffer.
	 */
	if (sg_is_last(req->src) && req->src_len == ctx->key_sz) {
		qat_req->src_align = NULL;
		vaddr = sg_virt(req->src);
	} else {
		int shift = ctx->key_sz - req->src_len;

		qat_req->src_align = kzalloc(ctx->key_sz, flags);
		if (unlikely(!qat_req->src_align))
			return ret;

		scatterwalk_map_and_copy(qat_req->src_align + shift, req->src,
					 0, req->src_len, 0);
		vaddr = qat_req->src_align;
	}

	qat_req->in.rsa.enc.m = dma_map_single(dev, vaddr, ctx->key_sz,
					       DMA_TO_DEVICE);
	if (unlikely(dma_mapping_error(dev, qat_req->in.rsa.enc.m)))
		goto unmap_src;

	if (sg_is_last(req->dst) && req->dst_len == ctx->key_sz) {
		qat_req->dst_align = NULL;
		vaddr = sg_virt(req->dst);
	} else {
		qat_req->dst_align = kzalloc(ctx->key_sz, flags);
		if (unlikely(!qat_req->dst_align))
			goto unmap_src;
		vaddr = qat_req->dst_align;
	}

	qat_req->out.rsa.enc.c = dma_map_single(dev, vaddr, ctx->key_sz,
						DMA_FROM_DEVICE);
	if (unlikely(dma_mapping_error(dev, qat_req->out.rsa.enc.c)))
		goto unmap_dst;

	qat_req->in.rsa.in_tab[3] = 0;
	qat_req->out.rsa.out_tab[1] = 0;
	qat_req->phy_in = dma_map_single(dev, &qat_req->in.rsa,
					 sizeof(struct qat_rsa_input_params),
					 DMA_TO_DEVICE);
	if (unlikely(dma_mapping_error(dev, qat_req->phy_in)))
		goto unmap_dst;

	qat_req->phy_out = dma_map_single(dev, &qat_req->out.rsa,
					  sizeof(struct qat_rsa_output_params),
					  DMA_TO_DEVICE);
	if (unlikely(dma_mapping_error(dev, qat_req->phy_out)))
		goto unmap_in_params;

	msg->pke_mid.src_data_addr = qat_req->phy_in;
	msg->pke_mid.dest_data_addr = qat_req->phy_out;
	msg->pke_mid.opaque = (u64)(__force long)qat_req;
	msg->input_param_count = 3;
	msg->output_param_count = 1;

	ret = qat_alg_send_asym_message(qat_req, inst, &req->base);
	if (ret == -ENOSPC)
		goto unmap_all;

	return ret;

unmap_all:
	if (!dma_mapping_error(dev, qat_req->phy_out))
		dma_unmap_single(dev, qat_req->phy_out,
				 sizeof(struct qat_rsa_output_params),
				 DMA_TO_DEVICE);
unmap_in_params:
	if (!dma_mapping_error(dev, qat_req->phy_in))
		dma_unmap_single(dev, qat_req->phy_in,
				 sizeof(struct qat_rsa_input_params),
				 DMA_TO_DEVICE);
unmap_dst:
	if (!dma_mapping_error(dev, qat_req->out.rsa.enc.c))
		dma_unmap_single(dev, qat_req->out.rsa.enc.c,
				 ctx->key_sz, DMA_FROM_DEVICE);
	kfree_sensitive(qat_req->dst_align);
unmap_src:
	if (!dma_mapping_error(dev, qat_req->in.rsa.enc.m))
		dma_unmap_single(dev, qat_req->in.rsa.enc.m, ctx->key_sz,
				 DMA_TO_DEVICE);
	kfree_sensitive(qat_req->src_align);
	return ret;
}

static int qat_rsa_dec(struct akcipher_request *req)
{
	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
	struct qat_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
	struct qat_crypto_instance *inst = ctx->inst;
	struct device *dev = &GET_DEV(inst->accel_dev);
	struct qat_asym_request *qat_req =
			PTR_ALIGN(akcipher_request_ctx(req), 64);
	struct icp_qat_fw_pke_request *msg = &qat_req->req;
	gfp_t flags = qat_algs_alloc_flags(&req->base);
	u8 *vaddr;
	int ret;

	if (unlikely(!ctx->n || !ctx->d))
		return -EINVAL;

	if (req->dst_len < ctx->key_sz) {
		req->dst_len = ctx->key_sz;
		return -EOVERFLOW;
	}

	if (req->src_len > ctx->key_sz)
		return -EINVAL;

	memset(msg, '\0', sizeof(*msg));
	ICP_QAT_FW_PKE_HDR_VALID_FLAG_SET(msg->pke_hdr,
					  ICP_QAT_FW_COMN_REQ_FLAG_SET);
	msg->pke_hdr.cd_pars.func_id = ctx->crt_mode ?
		qat_rsa_dec_fn_id_crt(ctx->key_sz) :
		qat_rsa_dec_fn_id(ctx->key_sz);
	if (unlikely(!msg->pke_hdr.cd_pars.func_id))
		return -EINVAL;

	qat_req->cb = qat_rsa_cb;
	qat_req->ctx.rsa = ctx;
	qat_req->areq.rsa = req;
	msg->pke_hdr.service_type = ICP_QAT_FW_COMN_REQ_CPM_FW_PKE;
	msg->pke_hdr.comn_req_flags =
		ICP_QAT_FW_COMN_FLAGS_BUILD(QAT_COMN_PTR_TYPE_FLAT,
					    QAT_COMN_CD_FLD_TYPE_64BIT_ADR);

	if (ctx->crt_mode) {
		qat_req->in.rsa.dec_crt.p = ctx->dma_p;
		qat_req->in.rsa.dec_crt.q = ctx->dma_q;
		qat_req->in.rsa.dec_crt.dp = ctx->dma_dp;
		qat_req->in.rsa.dec_crt.dq = ctx->dma_dq;
		qat_req->in.rsa.dec_crt.qinv = ctx->dma_qinv;
	} else {
		qat_req->in.rsa.dec.d = ctx->dma_d;
		qat_req->in.rsa.dec.n = ctx->dma_n;
	}
	ret = -ENOMEM;

	/*
	 * src can be of any size in valid range, but HW expects it to be the
	 * same as modulo n so in case it is different we need to allocate a
	 * new buf and copy src data.
	 * In other case we just need to map the user provided buffer.
	 * Also need to make sure that it is in contiguous buffer.
	 */
	if (sg_is_last(req->src) && req->src_len == ctx->key_sz) {
		qat_req->src_align = NULL;
		vaddr = sg_virt(req->src);
	} else {
		int shift = ctx->key_sz - req->src_len;

		qat_req->src_align = kzalloc(ctx->key_sz, flags);
		if (unlikely(!qat_req->src_align))
			return ret;

		scatterwalk_map_and_copy(qat_req->src_align + shift, req->src,
					 0, req->src_len, 0);
		vaddr = qat_req->src_align;
	}

	qat_req->in.rsa.dec.c = dma_map_single(dev, vaddr, ctx->key_sz,
					       DMA_TO_DEVICE);
	if (unlikely(dma_mapping_error(dev, qat_req->in.rsa.dec.c)))
		goto unmap_src;

	if (sg_is_last(req->dst) && req->dst_len == ctx->key_sz) {
		qat_req->dst_align = NULL;
		vaddr = sg_virt(req->dst);
	} else {
		qat_req->dst_align = kzalloc(ctx->key_sz, flags);
		if (unlikely(!qat_req->dst_align))
			goto unmap_src;
		vaddr = qat_req->dst_align;
	}
	qat_req->out.rsa.dec.m = dma_map_single(dev, vaddr, ctx->key_sz,
						DMA_FROM_DEVICE);
	if (unlikely(dma_mapping_error(dev, qat_req->out.rsa.dec.m)))
		goto unmap_dst;

	if (ctx->crt_mode)
		qat_req->in.rsa.in_tab[6] = 0;
	else
		qat_req->in.rsa.in_tab[3] = 0;
	qat_req->out.rsa.out_tab[1] = 0;
	qat_req->phy_in = dma_map_single(dev, &qat_req->in.rsa,
					 sizeof(struct qat_rsa_input_params),
					 DMA_TO_DEVICE);
	if (unlikely(dma_mapping_error(dev, qat_req->phy_in)))
		goto unmap_dst;

	qat_req->phy_out = dma_map_single(dev, &qat_req->out.rsa,
					  sizeof(struct qat_rsa_output_params),
					  DMA_TO_DEVICE);
	if (unlikely(dma_mapping_error(dev, qat_req->phy_out)))
		goto unmap_in_params;

	msg->pke_mid.src_data_addr = qat_req->phy_in;
	msg->pke_mid.dest_data_addr = qat_req->phy_out;
	msg->pke_mid.opaque = (u64)(__force long)qat_req;
	if (ctx->crt_mode)
		msg->input_param_count = 6;
	else
		msg->input_param_count = 3;

	msg->output_param_count = 1;

	ret = qat_alg_send_asym_message(qat_req, inst, &req->base);
	if (ret == -ENOSPC)
		goto unmap_all;

	return ret;

unmap_all:
	if (!dma_mapping_error(dev, qat_req->phy_out))
		dma_unmap_single(dev, qat_req->phy_out,
				 sizeof(struct qat_rsa_output_params),
				 DMA_TO_DEVICE);
unmap_in_params:
	if (!dma_mapping_error(dev, qat_req->phy_in))
		dma_unmap_single(dev, qat_req->phy_in,
				 sizeof(struct qat_rsa_input_params),
				 DMA_TO_DEVICE);
unmap_dst:
	if (!dma_mapping_error(dev, qat_req->out.rsa.dec.m))
		dma_unmap_single(dev, qat_req->out.rsa.dec.m,
				 ctx->key_sz, DMA_FROM_DEVICE);
	kfree_sensitive(qat_req->dst_align);
unmap_src:
	if (!dma_mapping_error(dev, qat_req->in.rsa.dec.c))
		dma_unmap_single(dev, qat_req->in.rsa.dec.c, ctx->key_sz,
				 DMA_TO_DEVICE);
	kfree_sensitive(qat_req->src_align);
	return ret;
}

static int qat_rsa_set_n(struct qat_rsa_ctx *ctx, const char *value,
			 size_t vlen)
{
	struct qat_crypto_instance *inst = ctx->inst;
	struct device *dev = &GET_DEV(inst->accel_dev);
	const char *ptr = value;
	int ret;

	while (!*ptr && vlen) {
		ptr++;
		vlen--;
	}

	ctx->key_sz = vlen;
	ret = -EINVAL;
	/* invalid key size provided */
	if (!qat_rsa_enc_fn_id(ctx->key_sz))
		goto err;

	ret = -ENOMEM;
	ctx->n = dma_alloc_coherent(dev, ctx->key_sz, &ctx->dma_n, GFP_KERNEL);
	if (!ctx->n)
		goto err;

	memcpy(ctx->n, ptr, ctx->key_sz);
	return 0;
err:
	ctx->key_sz = 0;
	ctx->n = NULL;
	return ret;
}

static int qat_rsa_set_e(struct qat_rsa_ctx *ctx, const char *value,
			 size_t vlen)
{
	struct qat_crypto_instance *inst = ctx->inst;
	struct device *dev = &GET_DEV(inst->accel_dev);
	const char *ptr = value;

	while (!*ptr && vlen) {
		ptr++;
		vlen--;
	}

	if (!ctx->key_sz || !vlen || vlen > ctx->key_sz) {
		ctx->e = NULL;
		return -EINVAL;
	}

	ctx->e = dma_alloc_coherent(dev, ctx->key_sz, &ctx->dma_e, GFP_KERNEL);
	if (!ctx->e)
		return -ENOMEM;

	memcpy(ctx->e + (ctx->key_sz - vlen), ptr, vlen);
	return 0;
}

static int qat_rsa_set_d(struct qat_rsa_ctx *ctx, const char *value,
			 size_t vlen)
{
	struct qat_crypto_instance *inst = ctx->inst;
	struct device *dev = &GET_DEV(inst->accel_dev);
	const char *ptr = value;
	int ret;

	while (!*ptr && vlen) {
		ptr++;
		vlen--;
	}

	ret = -EINVAL;
	if (!ctx->key_sz || !vlen || vlen > ctx->key_sz)
		goto err;

	ret = -ENOMEM;
	ctx->d = dma_alloc_coherent(dev, ctx->key_sz, &ctx->dma_d, GFP_KERNEL);
	if (!ctx->d)
		goto err;

	memcpy(ctx->d + (ctx->key_sz - vlen), ptr, vlen);
	return 0;
err:
	ctx->d = NULL;
	return ret;
}

static void qat_rsa_drop_leading_zeros(const char **ptr, unsigned int *len)
{
	while (!**ptr && *len) {
		(*ptr)++;
		(*len)--;
	}
}

static void qat_rsa_setkey_crt(struct qat_rsa_ctx *ctx, struct rsa_key *rsa_key)
{
	struct qat_crypto_instance *inst = ctx->inst;
	struct device *dev = &GET_DEV(inst->accel_dev);
	const char *ptr;
	unsigned int len;
	unsigned int half_key_sz = ctx->key_sz / 2;

	/* p */
	ptr = rsa_key->p;
	len = rsa_key->p_sz;
	qat_rsa_drop_leading_zeros(&ptr, &len);
	if (!len)
		goto err;
	ctx->p = dma_alloc_coherent(dev, half_key_sz, &ctx->dma_p, GFP_KERNEL);
	if (!ctx->p)
		goto err;
	memcpy(ctx->p + (half_key_sz - len), ptr, len);

	/* q */
	ptr = rsa_key->q;
	len = rsa_key->q_sz;
	qat_rsa_drop_leading_zeros(&ptr, &len);
	if (!len)
		goto free_p;
	ctx->q = dma_alloc_coherent(dev, half_key_sz, &ctx->dma_q, GFP_KERNEL);
	if (!ctx->q)
		goto free_p;
	memcpy(ctx->q + (half_key_sz - len), ptr, len);

	/* dp */
	ptr = rsa_key->dp;
	len = rsa_key->dp_sz;
	qat_rsa_drop_leading_zeros(&ptr, &len);
	if (!len)
		goto free_q;
	ctx->dp = dma_alloc_coherent(dev, half_key_sz, &ctx->dma_dp,
				     GFP_KERNEL);
	if (!ctx->dp)
		goto free_q;
	memcpy(ctx->dp + (half_key_sz - len), ptr, len);

	/* dq */
	ptr = rsa_key->dq;
	len = rsa_key->dq_sz;
	qat_rsa_drop_leading_zeros(&ptr, &len);
	if (!len)
		goto free_dp;
	ctx->dq = dma_alloc_coherent(dev, half_key_sz, &ctx->dma_dq,
				     GFP_KERNEL);
	if (!ctx->dq)
		goto free_dp;
	memcpy(ctx->dq + (half_key_sz - len), ptr, len);

	/* qinv */
	ptr = rsa_key->qinv;
	len = rsa_key->qinv_sz;
	qat_rsa_drop_leading_zeros(&ptr, &len);
	if (!len)
		goto free_dq;
	ctx->qinv = dma_alloc_coherent(dev, half_key_sz, &ctx->dma_qinv,
				       GFP_KERNEL);
	if (!ctx->qinv)
		goto free_dq;
	memcpy(ctx->qinv + (half_key_sz - len), ptr, len);

	ctx->crt_mode = true;
	return;

free_dq:
	memset(ctx->dq, '\0', half_key_sz);
	dma_free_coherent(dev, half_key_sz, ctx->dq, ctx->dma_dq);
	ctx->dq = NULL;
free_dp:
	memset(ctx->dp, '\0', half_key_sz);
	dma_free_coherent(dev, half_key_sz, ctx->dp, ctx->dma_dp);
	ctx->dp = NULL;
free_q:
	memset(ctx->q, '\0', half_key_sz);
	dma_free_coherent(dev, half_key_sz, ctx->q, ctx->dma_q);
	ctx->q = NULL;
free_p:
	memset(ctx->p, '\0', half_key_sz);
	dma_free_coherent(dev, half_key_sz, ctx->p, ctx->dma_p);
	ctx->p = NULL;
err:
	ctx->crt_mode = false;
}

static void qat_rsa_clear_ctx(struct device *dev, struct qat_rsa_ctx *ctx)
{
	unsigned int half_key_sz = ctx->key_sz / 2;

	/* Free the old key if any */
	if (ctx->n)
		dma_free_coherent(dev, ctx->key_sz, ctx->n, ctx->dma_n);
	if (ctx->e)
		dma_free_coherent(dev, ctx->key_sz, ctx->e, ctx->dma_e);
	if (ctx->d) {
		memset(ctx->d, '\0', ctx->key_sz);
		dma_free_coherent(dev, ctx->key_sz, ctx->d, ctx->dma_d);
	}
	if (ctx->p) {
		memset(ctx->p, '\0', half_key_sz);
		dma_free_coherent(dev, half_key_sz, ctx->p, ctx->dma_p);
	}
	if (ctx->q) {
		memset(ctx->q, '\0', half_key_sz);
		dma_free_coherent(dev, half_key_sz, ctx->q, ctx->dma_q);
	}
	if (ctx->dp) {
		memset(ctx->dp, '\0', half_key_sz);
		dma_free_coherent(dev, half_key_sz, ctx->dp, ctx->dma_dp);
	}
	if (ctx->dq) {
		memset(ctx->dq, '\0', half_key_sz);
		dma_free_coherent(dev, half_key_sz, ctx->dq, ctx->dma_dq);
	}
	if (ctx->qinv) {
		memset(ctx->qinv, '\0', half_key_sz);
		dma_free_coherent(dev, half_key_sz, ctx->qinv, ctx->dma_qinv);
	}

	ctx->n = NULL;
	ctx->e = NULL;
	ctx->d = NULL;
	ctx->p = NULL;
	ctx->q = NULL;
	ctx->dp = NULL;
	ctx->dq = NULL;
	ctx->qinv = NULL;
	ctx->crt_mode = false;
	ctx->key_sz = 0;
}

static int qat_rsa_setkey(struct crypto_akcipher *tfm, const void *key,
			  unsigned int keylen, bool private)
{
	struct qat_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
	struct device *dev = &GET_DEV(ctx->inst->accel_dev);
	struct rsa_key rsa_key;
	int ret;

	qat_rsa_clear_ctx(dev, ctx);

	if (private)
		ret = rsa_parse_priv_key(&rsa_key, key, keylen);
	else
		ret = rsa_parse_pub_key(&rsa_key, key, keylen);
	if (ret < 0)
		goto free;

	ret = qat_rsa_set_n(ctx, rsa_key.n, rsa_key.n_sz);
	if (ret < 0)
		goto free;
	ret = qat_rsa_set_e(ctx, rsa_key.e, rsa_key.e_sz);
	if (ret < 0)
		goto free;
	if (private) {
		ret = qat_rsa_set_d(ctx, rsa_key.d, rsa_key.d_sz);
		if (ret < 0)
			goto free;
		qat_rsa_setkey_crt(ctx, &rsa_key);
	}

	if (!ctx->n || !ctx->e) {
		/* invalid key provided */
		ret = -EINVAL;
		goto free;
	}
	if (private && !ctx->d) {
		/* invalid private key provided */
		ret = -EINVAL;
		goto free;
	}

	return 0;
free:
	qat_rsa_clear_ctx(dev, ctx);
	return ret;
}

static int qat_rsa_setpubkey(struct crypto_akcipher *tfm, const void *key,
			     unsigned int keylen)
{
	return qat_rsa_setkey(tfm, key, keylen, false);
}

static int qat_rsa_setprivkey(struct crypto_akcipher *tfm, const void *key,
			      unsigned int keylen)
{
	return qat_rsa_setkey(tfm, key, keylen, true);
}

static unsigned int qat_rsa_max_size(struct crypto_akcipher *tfm)
{
	struct qat_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);

	return ctx->key_sz;
}

static int qat_rsa_init_tfm(struct crypto_akcipher *tfm)
{
	struct qat_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
	struct qat_crypto_instance *inst =
			qat_crypto_get_instance_node(numa_node_id());

	if (!inst)
		return -EINVAL;

	akcipher_set_reqsize(tfm, sizeof(struct qat_asym_request) + 64);

	ctx->key_sz = 0;
	ctx->inst = inst;
	return 0;
}

static void qat_rsa_exit_tfm(struct crypto_akcipher *tfm)
{
	struct qat_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
	struct device *dev = &GET_DEV(ctx->inst->accel_dev);

	qat_rsa_clear_ctx(dev, ctx);
	qat_crypto_put_instance(ctx->inst);
}

static struct akcipher_alg rsa = {
	.encrypt = qat_rsa_enc,
	.decrypt = qat_rsa_dec,
	.set_pub_key = qat_rsa_setpubkey,
	.set_priv_key = qat_rsa_setprivkey,
	.max_size = qat_rsa_max_size,
	.init = qat_rsa_init_tfm,
	.exit = qat_rsa_exit_tfm,
	.base = {
		.cra_name = "rsa",
		.cra_driver_name = "qat-rsa",
		.cra_priority = 1000,
		.cra_module = THIS_MODULE,
		.cra_ctxsize = sizeof(struct qat_rsa_ctx),
	},
};

static struct kpp_alg dh = {
	.set_secret = qat_dh_set_secret,
	.generate_public_key = qat_dh_compute_value,
	.compute_shared_secret = qat_dh_compute_value,
	.max_size = qat_dh_max_size,
	.init = qat_dh_init_tfm,
	.exit = qat_dh_exit_tfm,
	.base = {
		.cra_name = "dh",
		.cra_driver_name = "qat-dh",
		.cra_priority = 1000,
		.cra_module = THIS_MODULE,
		.cra_ctxsize = sizeof(struct qat_dh_ctx),
	},
};

int qat_asym_algs_register(void)
{
	int ret = 0;

	mutex_lock(&algs_lock);
	if (++active_devs == 1) {
		rsa.base.cra_flags = 0;
		ret = crypto_register_akcipher(&rsa);
		if (ret)
			goto unlock;
		ret = crypto_register_kpp(&dh);
	}
unlock:
	mutex_unlock(&algs_lock);
	return ret;
}

void qat_asym_algs_unregister(void)
{
	mutex_lock(&algs_lock);
	if (--active_devs == 0) {
		crypto_unregister_akcipher(&rsa);
		crypto_unregister_kpp(&dh);
	}
	mutex_unlock(&algs_lock);
}