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Subject[PATCH v2 09/10] crypto: caam - add crypto_engine support for RSA algorithms
Date
Add crypto_engine support for RSA algorithms, to make use of
the engine queue.
The requests, with backlog flag, will be listed into crypto-engine
queue and processed by CAAM when free. In case the queue is empty,
the request is directly sent to CAAM.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
---
drivers/crypto/caam/caampkc.c | 144 ++++++++++++++++++++++++++++++++----------
drivers/crypto/caam/caampkc.h | 8 +++
2 files changed, 120 insertions(+), 32 deletions(-)

diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c
index 858cc95..82d5b55 100644
--- a/drivers/crypto/caam/caampkc.c
+++ b/drivers/crypto/caam/caampkc.c
@@ -118,19 +118,28 @@ static void rsa_pub_done(struct device *dev, u32 *desc, u32 err, void *context)
{
struct caam_akcipher_request_entry *jrentry = context;
struct akcipher_request *req = jrentry->base;
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+ struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
struct rsa_edesc *edesc;
int ecode = 0;

if (err)
ecode = caam_jr_strstatus(dev, err);

- edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
+ edesc = req_ctx->edesc;

rsa_pub_unmap(dev, edesc, req);
rsa_io_unmap(dev, edesc, req);
kfree(edesc);

- akcipher_request_complete(req, ecode);
+ /*
+ * If no backlog flag, the completion of the request is done
+ * by CAAM, not crypto engine.
+ */
+ if (!jrentry->bklog)
+ akcipher_request_complete(req, ecode);
+ else
+ crypto_finalize_akcipher_request(jrp->engine, req, ecode);
}

static void rsa_priv_f_done(struct device *dev, u32 *desc, u32 err,
@@ -139,15 +148,17 @@ static void rsa_priv_f_done(struct device *dev, u32 *desc, u32 err,
struct caam_akcipher_request_entry *jrentry = context;
struct akcipher_request *req = jrentry->base;
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
struct caam_rsa_key *key = &ctx->key;
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
struct rsa_edesc *edesc;
int ecode = 0;

if (err)
ecode = caam_jr_strstatus(dev, err);

- edesc = container_of(desc, struct rsa_edesc, hw_desc[0]);
+ edesc = req_ctx->edesc;

switch (key->priv_form) {
case FORM1:
@@ -163,7 +174,14 @@ static void rsa_priv_f_done(struct device *dev, u32 *desc, u32 err,
rsa_io_unmap(dev, edesc, req);
kfree(edesc);

- akcipher_request_complete(req, ecode);
+ /*
+ * If no backlog flag, the completion of the request is done
+ * by CAAM, not crypto engine.
+ */
+ if (!jrentry->bklog)
+ akcipher_request_complete(req, ecode);
+ else
+ crypto_finalize_akcipher_request(jrp->engine, req, ecode);
}

/**
@@ -312,6 +330,7 @@ static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
edesc->dst_nents = dst_nents;

edesc->jrentry.base = req;
+ req_ctx->edesc = edesc;

if (!sec4_sg_bytes)
return edesc;
@@ -343,6 +362,36 @@ static struct rsa_edesc *rsa_edesc_alloc(struct akcipher_request *req,
return ERR_PTR(-ENOMEM);
}

+static int akcipher_do_one_req(struct crypto_engine *engine, void *areq)
+{
+ struct akcipher_request *req = container_of(areq,
+ struct akcipher_request,
+ base);
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
+ struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct caam_akcipher_request_entry *jrentry;
+ struct device *jrdev = ctx->dev;
+ u32 *desc = req_ctx->edesc->hw_desc;
+ int ret;
+
+ jrentry = &req_ctx->edesc->jrentry;
+ jrentry->bklog = true;
+
+ ret = caam_jr_enqueue(jrdev, desc, req_ctx->akcipher_op_done,
+ jrentry);
+
+ if (ret != -EINPROGRESS) {
+ rsa_pub_unmap(jrdev, req_ctx->edesc, req);
+ rsa_io_unmap(jrdev, req_ctx->edesc, req);
+ kfree(req_ctx->edesc);
+ } else {
+ ret = 0;
+ }
+
+ return ret;
+}
+
static int set_rsa_pub_pdb(struct akcipher_request *req,
struct rsa_edesc *edesc)
{
@@ -606,10 +655,50 @@ static int set_rsa_priv_f3_pdb(struct akcipher_request *req,
return -ENOMEM;
}

+static int akcipher_enqueue_req(struct device *jrdev, u32 *desc,
+ void (*cbk)(struct device *jrdev, u32 *desc,
+ u32 err, void *context),
+ struct akcipher_request *req,
+ struct rsa_edesc *edesc)
+{
+ struct caam_drv_private_jr *jrpriv = dev_get_drvdata(jrdev);
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct caam_rsa_key *key = &ctx->key;
+ int ret;
+
+ if (req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)
+ return crypto_transfer_akcipher_request_to_engine(jrpriv->engine,
+ req);
+ else
+ ret = caam_jr_enqueue(jrdev, desc, cbk, &edesc->jrentry);
+
+ if (ret != -EINPROGRESS) {
+ switch (key->priv_form) {
+ case FORM1:
+ rsa_priv_f1_unmap(jrdev, edesc, req);
+ break;
+ case FORM2:
+ rsa_priv_f2_unmap(jrdev, edesc, req);
+ break;
+ case FORM3:
+ rsa_priv_f3_unmap(jrdev, edesc, req);
+ break;
+ default:
+ rsa_pub_unmap(jrdev, edesc, req);
+ }
+ rsa_io_unmap(jrdev, edesc, req);
+ kfree(edesc);
+ }
+
+ return ret;
+}
+
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 caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
struct caam_rsa_key *key = &ctx->key;
struct device *jrdev = ctx->dev;
struct rsa_edesc *edesc;
@@ -637,13 +726,9 @@ static int caam_rsa_enc(struct akcipher_request *req)
/* Initialize Job Descriptor */
init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub);

- ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_pub_done,
- &edesc->jrentry);
- if (ret == -EINPROGRESS)
- return ret;
-
- rsa_pub_unmap(jrdev, edesc, req);
-
+ req_ctx->akcipher_op_done = rsa_pub_done;
+ return akcipher_enqueue_req(jrdev, edesc->hw_desc, rsa_pub_done,
+ req, edesc);
init_fail:
rsa_io_unmap(jrdev, edesc, req);
kfree(edesc);
@@ -654,6 +739,7 @@ static int caam_rsa_dec_priv_f1(struct akcipher_request *req)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
struct device *jrdev = ctx->dev;
struct rsa_edesc *edesc;
int ret;
@@ -671,13 +757,9 @@ static int caam_rsa_dec_priv_f1(struct akcipher_request *req)
/* Initialize Job Descriptor */
init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1);

- ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f_done,
- &edesc->jrentry);
- if (ret == -EINPROGRESS)
- return ret;
-
- rsa_priv_f1_unmap(jrdev, edesc, req);
-
+ req_ctx->akcipher_op_done = rsa_priv_f_done;
+ return akcipher_enqueue_req(jrdev, edesc->hw_desc, rsa_priv_f_done,
+ req, edesc);
init_fail:
rsa_io_unmap(jrdev, edesc, req);
kfree(edesc);
@@ -688,6 +770,7 @@ static int caam_rsa_dec_priv_f2(struct akcipher_request *req)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
struct device *jrdev = ctx->dev;
struct rsa_edesc *edesc;
int ret;
@@ -705,13 +788,9 @@ static int caam_rsa_dec_priv_f2(struct akcipher_request *req)
/* Initialize Job Descriptor */
init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2);

- ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f_done,
- &edesc->jrentry);
- if (ret == -EINPROGRESS)
- return ret;
-
- rsa_priv_f2_unmap(jrdev, edesc, req);
-
+ req_ctx->akcipher_op_done = rsa_priv_f_done;
+ return akcipher_enqueue_req(jrdev, edesc->hw_desc, rsa_priv_f_done,
+ req, edesc);
init_fail:
rsa_io_unmap(jrdev, edesc, req);
kfree(edesc);
@@ -722,6 +801,7 @@ static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
{
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct caam_rsa_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct caam_rsa_req_ctx *req_ctx = akcipher_request_ctx(req);
struct device *jrdev = ctx->dev;
struct rsa_edesc *edesc;
int ret;
@@ -739,13 +819,9 @@ static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
/* Initialize Job Descriptor */
init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3);

- ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f_done,
- &edesc->jrentry);
- if (ret == -EINPROGRESS)
- return ret;
-
- rsa_priv_f3_unmap(jrdev, edesc, req);
-
+ req_ctx->akcipher_op_done = rsa_priv_f_done;
+ return akcipher_enqueue_req(jrdev, edesc->hw_desc, rsa_priv_f_done,
+ req, edesc);
init_fail:
rsa_io_unmap(jrdev, edesc, req);
kfree(edesc);
@@ -1037,6 +1113,10 @@ static int caam_rsa_init_tfm(struct crypto_akcipher *tfm)
return -ENOMEM;
}

+ ctx->enginectx.op.do_one_request = akcipher_do_one_req;
+
+ akcipher_set_reqsize(tfm, sizeof(struct caam_rsa_req_ctx));
+
return 0;
}

diff --git a/drivers/crypto/caam/caampkc.h b/drivers/crypto/caam/caampkc.h
index e0b1076..8e6d7e0 100644
--- a/drivers/crypto/caam/caampkc.h
+++ b/drivers/crypto/caam/caampkc.h
@@ -13,6 +13,7 @@
#include "compat.h"
#include "intern.h"
#include "pdb.h"
+#include <crypto/engine.h>

/**
* caam_priv_key_form - CAAM RSA private key representation
@@ -88,11 +89,13 @@ struct caam_rsa_key {

/**
* caam_rsa_ctx - per session context.
+ * @enginectx : crypto engine context
* @key : RSA key in DMA zone
* @dev : device structure
* @padding_dma : dma address of padding, for adding it to the input
*/
struct caam_rsa_ctx {
+ struct crypto_engine_ctx enginectx;
struct caam_rsa_key key;
struct device *dev;
dma_addr_t padding_dma;
@@ -104,11 +107,16 @@ struct caam_rsa_ctx {
* @src : input scatterlist (stripped of leading zeros)
* @fixup_src : input scatterlist (that might be stripped of leading zeros)
* @fixup_src_len : length of the fixup_src input scatterlist
+ * @edesc : s/w-extended rsa descriptor
+ * @akcipher_op_done : callback used when operation is done
*/
struct caam_rsa_req_ctx {
struct scatterlist src[2];
struct scatterlist *fixup_src;
unsigned int fixup_src_len;
+ struct rsa_edesc *edesc;
+ void (*akcipher_op_done)(struct device *jrdev, u32 *desc, u32 err,
+ void *context);
};

/*
--
2.1.0
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