On 5/12/2016 6:06 PM, Tudor Ambarus wrote:
> Add RSA support to caam driver.
>
> Coauthored-by: Yashpal Dutta <yashpal.dutta@xxxxxxxxxxxxx>
>
> Signed-off-by: Tudor Ambarus <tudor-dan.ambarus@xxxxxxx>
> ---
> drivers/crypto/caam/Kconfig | 12 ++
> drivers/crypto/caam/Makefile | 4 +
> drivers/crypto/caam/caampkc.c | 466 +++++++++++++++++++++++++++++++++++++++++
> drivers/crypto/caam/caampkc.h | 94 +++++++++
> drivers/crypto/caam/desc.h | 2 +
> drivers/crypto/caam/pdb.h | 16 +-
> drivers/crypto/caam/pkc_desc.c | 138 ++++++++++++
> 7 files changed, 731 insertions(+), 1 deletion(-)
> create mode 100644 drivers/crypto/caam/caampkc.c
> create mode 100644 drivers/crypto/caam/caampkc.h
> create mode 100644 drivers/crypto/caam/pkc_desc.c
>
> diff --git a/drivers/crypto/caam/Kconfig b/drivers/crypto/caam/Kconfig
> index 5652a53..44449ba 100644
> --- a/drivers/crypto/caam/Kconfig
> +++ b/drivers/crypto/caam/Kconfig
> @@ -99,6 +99,18 @@ config CRYPTO_DEV_FSL_CAAM_AHASH_API
> To compile this as a module, choose M here: the module
> will be called caamhash.
>
> +config CRYPTO_DEV_FSL_CAAM_PKC_API
> + tristate "Register public key cryptography implementations with Crypto API"
> + depends on CRYPTO_DEV_FSL_CAAM && CRYPTO_DEV_FSL_CAAM_JR
> + default y
> + select CRYPTO_RSA
> + help
> + Selecting this will allow SEC Public key support for RSA.
> + Supported cryptographic primitives: encryption, decryption,
> + signature and verification.
> + To compile this as a module, choose M here: the module
> + will be called caam_pkc.
> +
> config CRYPTO_DEV_FSL_CAAM_RNG_API
> tristate "Register caam device for hwrng API"
> depends on CRYPTO_DEV_FSL_CAAM && CRYPTO_DEV_FSL_CAAM_JR
> diff --git a/drivers/crypto/caam/Makefile b/drivers/crypto/caam/Makefile
> index 550758a..399ad55 100644
> --- a/drivers/crypto/caam/Makefile
> +++ b/drivers/crypto/caam/Makefile
> @@ -5,11 +5,15 @@ ifeq ($(CONFIG_CRYPTO_DEV_FSL_CAAM_DEBUG), y)
> EXTRA_CFLAGS := -DDEBUG
> endif
>
> +ccflags-y += -I$(srctree)/crypto
> +
> obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM) += caam.o
> obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_JR) += caam_jr.o
> obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API) += caamalg.o
> obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_AHASH_API) += caamhash.o
> obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_API) += caamrng.o
> +obj-$(CONFIG_CRYPTO_DEV_FSL_CAAM_PKC_API) += caam_pkc.o
>
> caam-objs := ctrl.o
> caam_jr-objs := jr.o key_gen.o error.o
> +caam_pkc-y := caampkc.o pkc_desc.o
> diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c
> new file mode 100644
> index 0000000..34ffa87
> --- /dev/null
> +++ b/drivers/crypto/caam/caampkc.c
> @@ -0,0 +1,466 @@
> +/*
> + * caam - Freescale FSL CAAM support for Public Key Cryptography
> + *
> + * Copyright 2016 Freescale Semiconductor, Inc.
> + *
> + * There is no Shared Descriptor for PKC so that the Job Descriptor must carry
> + * all the desired key parameters, input and output pointers.
> + */
> +#include <linux/dma-mapping.h>
> +#include <linux/fips.h>
> +#include "compat.h"
> +#include "caampkc.h"
> +#include "sg_sw_sec4.h"
> +#include "regs.h"
> +#include "intern.h"
> +#include "jr.h"
> +#include "error.h"
> +
> +static void rsa_io_unmap(struct device *dev, struct rsa_edesc *edesc,
> + struct akcipher_request *req)
> +{
> + dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
> + dma_unmap_sg(dev, req->src, edesc->src_nents, DMA_TO_DEVICE);
> +}
> +
> +static void rsa_pub_unmap(struct device *dev, struct rsa_edesc *edesc,
> + struct akcipher_request *req)
> +{
> + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
> + struct rsa_key *key = &ctx->key;
> + struct rsa_pub_desc *hw_desc = (struct rsa_pub_desc *)edesc->hw_desc;
> +
> + dma_unmap_single(dev, hw_desc->n_dma, key->n_sz, DMA_TO_DEVICE);
> + dma_unmap_single(dev, hw_desc->e_dma, key->e_sz, DMA_TO_DEVICE);
> +}
> +
> +static void rsa_priv_f1_unmap(struct device *dev, struct rsa_edesc *edesc,
> + struct akcipher_request *req)
> +{
> + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
> + struct rsa_key *key = &ctx->key;
> + struct rsa_priv_f1_desc *hw_desc =
> + (struct rsa_priv_f1_desc *)edesc->hw_desc;
> +
> + dma_unmap_single(dev, hw_desc->n_dma, key->n_sz, DMA_TO_DEVICE);
> + dma_unmap_single(dev, hw_desc->d_dma, key->n_sz, DMA_TO_DEVICE);
> +}
> +
> +static size_t skip_to_nonzero(u8 *ptr, size_t nbytes)
> +{
> + size_t nr_zeros = 0;
> +
> + while (!(*ptr) && nbytes) {
> + nbytes--;
> + ptr++;
> + nr_zeros++;
> + }
> +
> + return nr_zeros;
> +}
> +
> +static size_t scatterwalk_skip_zeros(struct scatter_walk *walk, size_t nbytes)
> +{
> + size_t len_this_page, nr_zeros, cnt = 0;
> + u8 *vaddr, *ptr;
> +
> + for (;;) {
> + nr_zeros = 0;
> + len_this_page = scatterwalk_pagelen(walk);
> +
> + if (len_this_page > nbytes)
> + len_this_page = nbytes;
> +
> + vaddr = scatterwalk_map(walk);
> + ptr = vaddr;
> + nr_zeros = skip_to_nonzero(ptr, len_this_page);
> + scatterwalk_unmap(vaddr);
> +
> + /* count total number of zeros */
> + cnt += nr_zeros;
> +
> + /* advance scatterwalk to the nonzero data */
> + scatterwalk_advance(walk, nr_zeros);
> +
> + if (nr_zeros < len_this_page || nbytes == len_this_page)
> + break;
> +
> + nbytes -= len_this_page;
> +
> + scatterwalk_pagedone(walk, 0, 1);
> + }
> +
> + return cnt;
> +}
> +
> +/*
> + * This function drops the leading zeros and copies the data to the initial
> + * pointer so that it can be freed later on. Returns the updated data length.
> + */
> +static size_t drop_leading_zeros(struct scatterlist *sg, size_t nbytes)
> +{
> + struct scatter_walk walk_src, walk_dst;
> + size_t nr_zeros = 0;
> +
> + scatterwalk_start(&walk_src, sg);
> + nr_zeros = scatterwalk_skip_zeros(&walk_src, nbytes);
> +
> + if (nr_zeros) {
> + nbytes = nbytes - nr_zeros;
> +
> + scatterwalk_start(&walk_dst, sg);
> + scatterwalk_sg_copychunks(&walk_dst, &walk_src, nbytes);
> + scatterwalk_done(&walk_dst, 0, 0);
> + }
> +
> + scatterwalk_done(&walk_src, 0, 0);
> +
> + return nbytes;
> +}
> +
> +/* RSA Job Completion handler */
> +static void rsa_pub_done(struct device *dev, u32 *desc, u32 err, void *context)
> +{
> + struct akcipher_request *req = context;
> + struct rsa_edesc *edesc;
> +
> + if (err)
> + caam_jr_strstatus(dev, err);
> +
> + /*
> + * RSA's output is expected to be a big integer. Drop the leading
> + * zeros since they are not meaningful in the world of numbers.
> + */
> + req->dst_len = drop_leading_zeros(req->dst, req->dst_len);
> +
> + edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
> +
> + rsa_pub_unmap(dev, edesc, req);
> + rsa_io_unmap(dev, edesc, req);
> + kfree(edesc);
> +
> + akcipher_request_complete(req, err);
> +}
> +
> +static void rsa_priv_f1_done(struct device *dev, u32 *desc, u32 err,
> + void *context)
> +{
> + struct akcipher_request *req = context;
> + struct rsa_edesc *edesc;
> +
> + if (err)
> + caam_jr_strstatus(dev, err);
> +
> + /*
> + * RSA's output is expected to be a big integer. Drop the leading
> + * zeros since they are not meaningful in the world of numbers.
> + */
> + req->dst_len = drop_leading_zeros(req->dst, req->dst_len);
> +
> + edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
> +
> + rsa_priv_f1_unmap(dev, edesc, req);
> + rsa_io_unmap(dev, edesc, req);
> + kfree(edesc);
> +
> + akcipher_request_complete(req, err);
> +}
> +
> +static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
> + size_t desclen)
> +{
> + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
> + struct device *dev = ctx->dev;
> + struct rsa_edesc *edesc;
> + gfp_t flags = (req->base.flags & (CRYPTO_TFM_REQ_MAY_BACKLOG |
> + CRYPTO_TFM_REQ_MAY_SLEEP)) ? GFP_KERNEL : GFP_ATOMIC;
> + int sgc;
> + int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;
> + int src_nents, dst_nents;
> +
> + src_nents = sg_nents_for_len(req->src, req->src_len);
> + dst_nents = sg_nents_for_len(req->dst, req->dst_len);
> +
> + if (src_nents > 1)
> + sec4_sg_len = src_nents;
> + if (dst_nents > 1)
> + sec4_sg_len += dst_nents;
> +
> + sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry);
> +
> + /* allocate space for base edesc, hw desc commands and link tables */
> + edesc = kzalloc(sizeof(*edesc) + desclen + sec4_sg_bytes,
> + GFP_DMA | flags);
> + if (!edesc)
> + return ERR_PTR(-ENOMEM);
> +
> + sgc = dma_map_sg(dev, req->src, src_nents, DMA_TO_DEVICE);
> + if (unlikely(!sgc)) {
> + dev_err(dev, "unable to map source\n");
> + goto src_fail;
> + }
> +
> + sgc = dma_map_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
> + if (unlikely(!sgc)) {
> + dev_err(dev, "unable to map destination\n");
> + goto dst_fail;
> + }
> +
> + edesc->sec4_sg = (void *)edesc + sizeof(*edesc) + desclen;
> +
> + sec4_sg_index = 0;
> + if (src_nents > 1) {
> + sg_to_sec4_sg_last(req->src, src_nents, edesc->sec4_sg, 0);
> + sec4_sg_index += src_nents;
> + }
> + if (dst_nents > 1) {
> + sg_to_sec4_sg_last(req->dst, dst_nents,
> + edesc->sec4_sg + sec4_sg_index, 0);
> + }
> +
> + /* Save nents for later use in Job Descriptor. */
> + edesc->src_nents = src_nents;
> + edesc->dst_nents = dst_nents;
> +
> + if (!sec4_sg_bytes)
> + return edesc;
> +
> + edesc->sec4_sg_dma = dma_map_single(dev, edesc->sec4_sg,
> + sec4_sg_bytes, DMA_TO_DEVICE);
Where is sec4_sg_dma unmapped?
> + if (dma_mapping_error(dev, edesc->sec4_sg_dma)) {
> + dev_err(dev, "unable to map S/G table\n");
> + goto sec4_sg_fail;
> + }
> +
> + return edesc;
> +
> +sec4_sg_fail:
> + dma_unmap_sg(dev, req->dst, dst_nents, DMA_FROM_DEVICE);
> +dst_fail:
> + dma_unmap_sg(dev, req->src, src_nents, DMA_TO_DEVICE);
> +src_fail:
> + kfree(edesc);
> + return ERR_PTR(-ENOMEM);
> +}
> +
> +static int caam_rsa_enc(struct akcipher_request *req)
> +{
> + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
> + struct rsa_key *key = &ctx->key;
> + struct device *jrdev = ctx->dev;
> + struct rsa_edesc *edesc = NULL;
> + size_t desclen = sizeof(struct rsa_pub_desc);
> + int ret;
> +
> + if (unlikely(!key->n || !key->e))
> + return -EINVAL;
> +
> + if (req->dst_len < key->n_sz) {
> + req->dst_len = key->n_sz;
> + dev_err(jrdev, "Output buffer length less than parameter n\n");
> + return -EOVERFLOW;
> + }
> +
> + /* Allocate extended descriptor. */
> + edesc = rsa_edesc_alloc(req, desclen);
> + if (IS_ERR(edesc))
> + return PTR_ERR(edesc);
> +
> + /* Initialize Job Descriptor. */
> + ret = init_rsa_pub_desc(req, edesc);
> + if (ret)
> + goto init_fail;
> +
> + ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_pub_done, req);
> + if (!ret)
> + return -EINPROGRESS;
> +
> + rsa_pub_unmap(jrdev, edesc, req);
> +
> +init_fail:
> + rsa_io_unmap(jrdev, edesc, req);
> + kfree(edesc);
> + return ret;
> +}
> +
> +static int caam_rsa_dec(struct akcipher_request *req)
> +{
> + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
> + struct rsa_key *key = &ctx->key;
> + struct device *jrdev = ctx->dev;
> + struct rsa_edesc *edesc = NULL;
> + size_t desclen = sizeof(struct rsa_priv_f1_desc);
> + int ret;
> +
> + if (unlikely(!key->n || !key->d))
> + return -EINVAL;
> +
> + if (req->dst_len < key->n_sz) {
> + req->dst_len = key->n_sz;
Be consistent with caam_rsa_enc(): either do a dev_err() here, or remove
the error message in caam_rsa_enc().
> + return -EOVERFLOW;
> + }
> +
> + /* Allocate extended descriptor. */
> + edesc = rsa_edesc_alloc(req, desclen);
> + if (IS_ERR(edesc))
> + return PTR_ERR(edesc);
> +
> + /* Initialize Job Descriptor. */
> + ret = init_rsa_priv_f1_desc(req, edesc);
> + if (ret)
> + goto init_fail;
> +
> + ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f1_done, req);
> + if (!ret)
> + return -EINPROGRESS;
> +
> + rsa_priv_f1_unmap(jrdev, edesc, req);
> +
> +init_fail:
> + rsa_io_unmap(jrdev, edesc, req);
> + kfree(edesc);
> + return ret;
> +}
> +
> +static int caam_rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key,
> + unsigned int keylen)
> +{
> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
> + struct rsa_key *rsa_key = &ctx->key;
> +
> + return rsa_parse_pub_key(rsa_key, key, keylen);
> +}
> +
> +static int caam_rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
> + unsigned int keylen)
> +{
> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
> + struct rsa_key *rsa_key = &ctx->key;
> +
> + return rsa_parse_priv_key(rsa_key, key, keylen);
> +}
> +
> +static int caam_rsa_max_size(struct crypto_akcipher *tfm)
> +{
> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
> + struct rsa_key *key = &ctx->key;
> +
> + return (key->n) ? key->n_sz : -EINVAL;
> +}
> +
> +/* Per session pkc's driver context creation function */
> +static int caam_rsa_init_tfm(struct crypto_akcipher *tfm)
> +{
> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
> + struct rsa_key *key = &ctx->key;
> +
> + ctx->dev = caam_jr_alloc();
> +
> + if (IS_ERR(ctx->dev)) {
> + dev_err(ctx->dev, "Job Ring Device allocation for transform failed\n");
> + return PTR_ERR(ctx->dev);
> + }
> +
> + key->flags = GFP_DMA | GFP_KERNEL;
> + return 0;
> +}
> +
> +/* Per session pkc's driver context cleanup function */
> +static void caam_rsa_exit_tfm(struct crypto_akcipher *tfm)
> +{
> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
> + struct rsa_key *key = &ctx->key;
> +
> + rsa_free_key(key);
> + caam_jr_free(ctx->dev);
> +}
> +
> +static struct akcipher_alg caam_rsa = {
> + .encrypt = caam_rsa_enc,
> + .decrypt = caam_rsa_dec,
> + .sign = caam_rsa_dec,
> + .verify = caam_rsa_enc,
> + .set_pub_key = caam_rsa_set_pub_key,
> + .set_priv_key = caam_rsa_set_priv_key,
> + .max_size = caam_rsa_max_size,
> + .init = caam_rsa_init_tfm,
> + .exit = caam_rsa_exit_tfm,
> + .base = {
> + .cra_name = "rsa",
> + .cra_driver_name = "rsa-caam",
> + .cra_priority = 3000,
> + .cra_module = THIS_MODULE,
> + .cra_alignmask = 0,
> + .cra_ctxsize = sizeof(struct caam_rsa_ctx),
> + },
> +};
> +
> +/* Public Key Cryptography module initialization handler */
> +static int __init caam_pkc_init(void)
> +{
> + struct device_node *dev_node;
> + struct platform_device *pdev;
> + struct device *ctrldev;
> + struct caam_drv_private *priv;
> + u32 cha_inst, pk_inst;
> + int err = 0;
> +
> + dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0");
> + if (!dev_node) {
> + dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec4.0");
> + if (!dev_node)
> + return -ENODEV;
> + }
> +
> + pdev = of_find_device_by_node(dev_node);
> + if (!pdev) {
> + of_node_put(dev_node);
> + return -ENODEV;
> + }
> +
> + ctrldev = &pdev->dev;
> + priv = dev_get_drvdata(ctrldev);
> + of_node_put(dev_node);
> +
> + /*
> + * If priv is NULL, it's probably because the caam driver wasn't
> + * properly initialized (e.g. RNG4 init failed). Thus, bail out here.
> + */
> + if (!priv)
> + return -ENODEV;
> +
> + /* Determine public key hardware accelerator presence. */
> + cha_inst = rd_reg32(&priv->ctrl->perfmon.cha_num_ls);
> + pk_inst = (cha_inst & CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT;
> +
> + /* Do not register algorithms if PKHA is not present. */
> + if (!pk_inst)
> + return -ENODEV;
> +
> + caam_rsa.base.cra_flags = 0;
> + err = crypto_register_akcipher(&caam_rsa);
> + if (err)
> + dev_warn(ctrldev, "%s alg registration failed\n",
> + caam_rsa.base.cra_driver_name);
> + else
> + dev_info(ctrldev, "caam algorithms registered in /proc/crypto\n");
Be specific which type of algorithms are being registered (pkc / asym).
> +
> + return err;
> +}
> +
> +static void __exit caam_pkc_exit(void)
> +{
> + crypto_unregister_akcipher(&caam_rsa);
> +}
> +
> +module_init(caam_pkc_init);
> +module_exit(caam_pkc_exit);
> +
> +MODULE_LICENSE("Dual BSD/GPL");
> +MODULE_DESCRIPTION("FSL CAAM support for PKC functions of crypto API");
> +MODULE_AUTHOR("Freescale Semiconductor");
> diff --git a/drivers/crypto/caam/caampkc.h b/drivers/crypto/caam/caampkc.h
> new file mode 100644
> index 0000000..398a881
> --- /dev/null
> +++ b/drivers/crypto/caam/caampkc.h
> @@ -0,0 +1,94 @@
> +/*
> + * caam - Freescale FSL CAAM support for Public Key Cryptography descriptors
> + *
> + * Copyright 2016 Freescale Semiconductor, Inc.
> + *
> + * There is no Shared Descriptor for PKC so that the Job Descriptor must carry
> + * all the desired key parameters, input and output pointers.
> + */
> +
> +#ifndef _PKC_DESC_H_
> +#define _PKC_DESC_H_
> +
> +#include <crypto/internal/rsa.h>
> +#include <crypto/akcipher.h>
> +#include <crypto/internal/akcipher.h>
> +#include "desc_constr.h"
> +#include "pdb.h"
> +#include "rsapubkey-asn1.h"
> +#include "rsaprivkey-asn1.h"
> +
> +/**
> + * caam_rsa_ctx - per session context.
> + * @key: RSA key structure
> + * @dev: device structure
> + */
> +struct caam_rsa_ctx {
> + struct rsa_key key;
> + struct device *dev;
> +};
> +
> +/**
> + * RSA Pub_Key Descriptor
> + * @desc_hdr: Job Descriptor Header command
> + * @sgf: scatter-gather field
> + * @f_dma: dma address of input data
> + * @g_dma: dma address of ecrypted output data
s/ecrypted/encrypted
> + * @n_dma: dma address of RSA public exponent
modulus
> + * @dma_e: dma address of RSA public exponent
s/dma_e/e_dma
> + * @f_len: length in octets of the input data
> + * @op: RSA Operation command
> + */
> +struct rsa_pub_desc {
> + u32 desc_hdr;
> + u32 sgf;
> + dma_addr_t f_dma;
> + dma_addr_t g_dma;
> + dma_addr_t n_dma;
> + dma_addr_t e_dma;
> + u32 f_len;
> + u32 op;
> +} __packed;
> +
> +/**
> + * Form1 Priv_key Decryption Descriptor.
> + * Private key is represented by (n,d).
> + * @desc_hdr: Job Descriptor Header command
> + * @sgf: scatter-gather field
> + * @g_dma: dma address of ecrypted input data
s/ecrypted/encrypted
> + * @f_dma: dma address of output data
> + * @n_dma: dma address of RSA public exponent
modulus
> + * @dma_d: dma address of RSA private exponent
s/dma_d/d_dma
> + * @op: RSA Operation command
> + */
> +struct rsa_priv_f1_desc {
> + u32 desc_hdr;
> + u32 sgf;
> + dma_addr_t g_dma;
> + dma_addr_t f_dma;
> + dma_addr_t n_dma;
> + dma_addr_t d_dma;
> + u32 op;
> +} __packed;
> +
> +/**
> + * rsa_edesc - s/w-extended rsa descriptor
> + * @src_nents: number of segments in input scatterlist
> + * @dst_nents: number of segments in output scatterlist
> + * @sec4_sg_dma: dma address of h/w link table
> + * @sec4_sg: pointer to h/w link table
> + * @hw_desc: descriptor followed by link tables if any
> + */
> +struct rsa_edesc {
> + int src_nents;
> + int dst_nents;
> + dma_addr_t sec4_sg_dma;
> + struct sec4_sg_entry *sec4_sg;
> + u32 hw_desc[];
> +};
> +
> +/* Descriptor construction primitives. */
> +int init_rsa_pub_desc(struct akcipher_request *req, struct rsa_edesc *edesc);
> +int init_rsa_priv_f1_desc(struct akcipher_request *req,
> + struct rsa_edesc *edesc);
> +#endif
> diff --git a/drivers/crypto/caam/desc.h b/drivers/crypto/caam/desc.h
> index 1e93c6a..7e5c027 100644
> --- a/drivers/crypto/caam/desc.h
> +++ b/drivers/crypto/caam/desc.h
> @@ -454,6 +454,8 @@ struct sec4_sg_entry {
> #define OP_PCLID_PUBLICKEYPAIR (0x14 << OP_PCLID_SHIFT)
> #define OP_PCLID_DSASIGN (0x15 << OP_PCLID_SHIFT)
> #define OP_PCLID_DSAVERIFY (0x16 << OP_PCLID_SHIFT)
> +#define OP_PCLID_RSAENC_PUBKEY (0x18 << OP_PCLID_SHIFT)
> +#define OP_PCLID_RSADEC_PRVKEY (0x19 << OP_PCLID_SHIFT)
>
> /* Assuming OP_TYPE = OP_TYPE_DECAP_PROTOCOL/ENCAP_PROTOCOL */
> #define OP_PCLID_IPSEC (0x01 << OP_PCLID_SHIFT)
> diff --git a/drivers/crypto/caam/pdb.h b/drivers/crypto/caam/pdb.h
> index 3a87c0c..1c68d7b 100644
> --- a/drivers/crypto/caam/pdb.h
> +++ b/drivers/crypto/caam/pdb.h
> @@ -1,7 +1,7 @@
> /*
> * CAAM Protocol Data Block (PDB) definition header file
> *
> - * Copyright 2008-2012 Freescale Semiconductor, Inc.
> + * Copyright 2008-2016 Freescale Semiconductor, Inc.
> *
> */
>
> @@ -399,4 +399,18 @@ struct dsa_verify_pdb {
> u8 *ab; /* only used if ECC processing */
> };
>
> +/* RSA Protocol Data Block */
> +#define RSA_PDB_SGF_SHIFT 28
> +#define RSA_PDB_E_SHIFT 12
> +#define RSA_PDB_E_MASK (0xFFF << RSA_PDB_E_SHIFT)
> +#define RSA_PDB_D_SHIFT 12
> +#define RSA_PDB_D_MASK (0xFFF << RSA_PDB_D_SHIFT)
> +
> +#define RSA_PDB_SGF_F (0x8 << RSA_PDB_SGF_SHIFT)
> +#define RSA_PDB_SGF_G (0x4 << RSA_PDB_SGF_SHIFT)
> +#define RSA_PRIV_PDB_SGF_F (0x4 << RSA_PDB_SGF_SHIFT)
> +#define RSA_PRIV_PDB_SGF_G (0x8 << RSA_PDB_SGF_SHIFT)
> +
> +#define RSA_PRIV_KEY_FRM_1 0
> +
> #endif
> diff --git a/drivers/crypto/caam/pkc_desc.c b/drivers/crypto/caam/pkc_desc.c
> new file mode 100644
> index 0000000..25c0690
> --- /dev/null
> +++ b/drivers/crypto/caam/pkc_desc.c
> @@ -0,0 +1,138 @@
> +/*
> + * caam - Freescale FSL CAAM support for Public Key Cryptography descriptors
> + *
> + * Copyright 2016 Freescale Semiconductor, Inc.
> + *
> + * There is no Shared Descriptor for PKC so that the Job Descriptor must carry
> + * all the desired key parameters, input and output pointers.
> + */
> +#include "caampkc.h"
> +
> +/* Descriptor for RSA Public operation */
> +int init_rsa_pub_desc(struct akcipher_request *req, struct rsa_edesc *edesc)
> +{
> + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
> + struct rsa_key *key = &ctx->key;
> + struct device *dev = ctx->dev;
> + struct rsa_pub_desc *desc = (struct rsa_pub_desc *)edesc->hw_desc;
> + u32 start_idx, desc_size;
> + int sec4_sg_index = 0;
> +
> + /*
> + * The PDB has static fields and can be initialized before writing
> + * a specific command. Map the memory first, since it can be a point
> + * of failure.
> + */
> + desc->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
> + if (dma_mapping_error(dev, desc->n_dma)) {
> + dev_err(dev, "Unable to map modulus memory\n");
> + goto n_fail;
> + }
> +
> + desc->e_dma = dma_map_single(dev, key->e, key->e_sz, DMA_TO_DEVICE);
> + if (dma_mapping_error(dev, desc->e_dma)) {
> + dev_err(dev, "Unable to map exponent memory\n");
> + goto e_fail;
> + }
> +
> + desc_size = sizeof(*desc) / CAAM_CMD_SZ;
Descriptor has a few addresses in it, thus you'll also have to use
CAAM_PTR_SZ.
> + start_idx = (desc_size - 1) & HDR_START_IDX_MASK;
> + init_job_desc(edesc->hw_desc, (start_idx << HDR_START_IDX_SHIFT) |
> + (start_idx & HDR_DESCLEN_MASK) | HDR_ONE);
> +
> + sec4_sg_index = 0;
> + if (edesc->src_nents > 1) {
> + desc->sgf |= RSA_PDB_SGF_F;
> + desc->f_dma = edesc->sec4_sg_dma;
> + sec4_sg_index += edesc->src_nents;
> + } else {
> + desc->f_dma = sg_dma_address(req->src);
> + }
> +
> + if (edesc->dst_nents > 1) {
> + desc->sgf |= RSA_PDB_SGF_G;
> + desc->g_dma = edesc->sec4_sg_dma +
> + sec4_sg_index * sizeof(struct sec4_sg_entry);
> + } else {
> + desc->g_dma = sg_dma_address(req->dst);
> + }
> +
> + desc->sgf |= (key->e_sz << RSA_PDB_E_SHIFT) | key->n_sz;
> + desc->f_len = req->src_len;
> + desc->op = CMD_OPERATION | OP_TYPE_UNI_PROTOCOL |
> + OP_PCLID_RSAENC_PUBKEY;
> + return 0;
> +
> +e_fail:
> + dma_unmap_single(dev, desc->n_dma, key->n_sz, DMA_TO_DEVICE);
> +n_fail:
> + dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
> + dma_unmap_sg(dev, req->src, edesc->src_nents, DMA_TO_DEVICE);
> + kfree(edesc);
> + return -ENOMEM;
> +}
> +
> +/* Descriptor for RSA Private operation */
> +int init_rsa_priv_f1_desc(struct akcipher_request *req, struct rsa_edesc *edesc)
> +{
> + struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
> + struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
> + struct rsa_key *key = &ctx->key;
> + struct device *dev = ctx->dev;
> + struct rsa_priv_f1_desc *desc =
> + (struct rsa_priv_f1_desc *)edesc->hw_desc;
> + int sec4_sg_index = 0;
> + u32 start_idx, desc_size;
> +
> + /*
> + * The PDB has static fields and can be initialized before writing
> + * a specific command. Map the memory first, since it can be a point
> + * of failure.
> + */
> + desc->n_dma = dma_map_single(dev, key->n, key->n_sz, DMA_TO_DEVICE);
> + if (dma_mapping_error(dev, desc->n_dma)) {
> + dev_err(dev, "Unable to map modulus memory\n");
> + goto n_fail;
> + }
> +
> + desc->d_dma = dma_map_single(dev, key->d, key->n_sz, DMA_TO_DEVICE);
> + if (dma_mapping_error(dev, desc->d_dma)) {
> + dev_err(dev, "Unable to map exponent memory\n");
> + goto d_fail;
> + }
> +
> + desc_size = sizeof(*desc) / CAAM_CMD_SZ;
Descriptor has a few addresses in it, thus you'll also have to use
CAAM_PTR_SZ.
> + start_idx = (desc_size - 1) & HDR_START_IDX_MASK;
> + init_job_desc(edesc->hw_desc, (start_idx << HDR_START_IDX_SHIFT) |
> + (start_idx & HDR_DESCLEN_MASK) | HDR_ONE);
> +
> + if (edesc->src_nents > 1) {
> + desc->sgf |= RSA_PRIV_PDB_SGF_G;
> + desc->g_dma = edesc->sec4_sg_dma;
> + sec4_sg_index += edesc->src_nents;
> + } else {
> + desc->g_dma = sg_dma_address(req->src);
> + }
> +
> + if (edesc->dst_nents > 1) {
> + desc->sgf |= RSA_PRIV_PDB_SGF_F;
> + desc->f_dma = edesc->sec4_sg_dma +
> + sec4_sg_index * sizeof(struct sec4_sg_entry);
> + } else {
> + desc->f_dma = sg_dma_address(req->dst);
> + }
> +
> + desc->sgf |= (key->n_sz << RSA_PDB_D_SHIFT) | key->n_sz;
> + desc->op = CMD_OPERATION | OP_TYPE_UNI_PROTOCOL |
> + OP_PCLID_RSADEC_PRVKEY | RSA_PRIV_KEY_FRM_1;
> + return 0;
> +
> +d_fail:
> + dma_unmap_single(dev, desc->n_dma, key->n_sz, DMA_TO_DEVICE);
> +n_fail:
> + dma_unmap_sg(dev, req->dst, edesc->dst_nents, DMA_FROM_DEVICE);
> + dma_unmap_sg(dev, req->src, edesc->src_nents, DMA_TO_DEVICE);
> + kfree(edesc);
> + return -ENOMEM;
> +}
>
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