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crypto: sun4i-ss - unify update/final function 

The update and final functions have lots of common action.
This patch mix them in one function.
This will give some improvements:
- This will permit asynchronous support more easily
- This will permit to use finup/digest functions with some performance
  improvements

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Corentin LABBE 2016-08-10 11:45:30 +02:00 committed by Herbert Xu
parent ea1a674143
commit 477d9b2e59
2 changed files with 85 additions and 63 deletions
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147
drivers/crypto/sunxi-ss/sun4i-ss-hash.c
View File

@ -129,6 +129,9 @@ int sun4i_hash_import_sha1(struct ahash_request *areq, const void *in)
return 0;
}
#define SS_HASH_UPDATE 1
#define SS_HASH_FINAL 2
/*
* sun4i_hash_update: update hash engine
*
@ -156,7 +159,7 @@ int sun4i_hash_import_sha1(struct ahash_request *areq, const void *in)
* write remaining data in op->buf
* final state op->len=56
*/
int sun4i_hash_update(struct ahash_request *areq)
int sun4i_hash(struct ahash_request *areq)
{
u32 v, ivmode = 0;
unsigned int i = 0;
@ -180,22 +183,30 @@ int sun4i_hash_update(struct ahash_request *areq)
u32 spaces, rx_cnt = SS_RX_DEFAULT;
size_t copied = 0;
struct sg_mapping_iter mi;
unsigned int j = 0;
int zeros;
unsigned int index, padlen;
__be64 bits;
u32 bf[32];
u32 wb = 0;
unsigned int nwait, nbw = 0;
struct scatterlist *in_sg = areq->src;
dev_dbg(ss->dev, "%s %s bc=%llu len=%u mode=%x wl=%u h0=%0x",
__func__, crypto_tfm_alg_name(areq->base.tfm),
op->byte_count, areq->nbytes, op->mode,
op->len, op->hash[0]);
if (areq->nbytes == 0)
if (unlikely(areq->nbytes == 0) && (op->flags & SS_HASH_FINAL) == 0)
return 0;
/* protect against overflow */
if (areq->nbytes > UINT_MAX - op->len) {
if (unlikely(areq->nbytes > UINT_MAX - op->len)) {
dev_err(ss->dev, "Cannot process too large request\n");
return -EINVAL;
}
if (op->len + areq->nbytes < 64) {
if (op->len + areq->nbytes < 64 && (op->flags & SS_HASH_FINAL) == 0) {
/* linearize data to op->buf */
copied = sg_pcopy_to_buffer(areq->src, sg_nents(areq->src),
op->buf + op->len, areq->nbytes, 0);
@ -203,14 +214,6 @@ int sun4i_hash_update(struct ahash_request *areq)
return 0;
}
end = ((areq->nbytes + op->len) / 64) * 64 - op->len;
if (end > areq->nbytes || areq->nbytes - end > 63) {
dev_err(ss->dev, "ERROR: Bound error %u %u\n",
end, areq->nbytes);
return -EINVAL;
}
spin_lock_bh(&ss->slock);
/*
@ -225,6 +228,33 @@ int sun4i_hash_update(struct ahash_request *areq)
/* Enable the device */
writel(op->mode | SS_ENABLED | ivmode, ss->base + SS_CTL);
if ((op->flags & SS_HASH_UPDATE) == 0)
goto hash_final;
/* start of handling data */
if ((op->flags & SS_HASH_FINAL) == 0) {
end = ((areq->nbytes + op->len) / 64) * 64 - op->len;
if (end > areq->nbytes || areq->nbytes - end > 63) {
dev_err(ss->dev, "ERROR: Bound error %u %u\n",
end, areq->nbytes);
return -EINVAL;
}
} else {
/* Since we have the flag final, we can go up to modulo 4 */
end = ((areq->nbytes + op->len) / 4) * 4 - op->len;
}
/* TODO if SGlen % 4 and op->len == 0 then DMA */
i = 1;
while (in_sg && i == 1) {
if ((in_sg->length % 4) != 0)
i = 0;
in_sg = sg_next(in_sg);
}
if (i == 1 && op->len == 0)
dev_dbg(ss->dev, "We can DMA\n");
i = 0;
sg_miter_start(&mi, areq->src, sg_nents(areq->src),
SG_MITER_FROM_SG | SG_MITER_ATOMIC);
@ -285,7 +315,11 @@ int sun4i_hash_update(struct ahash_request *areq)
}
}
} while (i < end);
/* final linear */
/*
* Now we have written to the device all that we can,
* store the remaining bytes in op->buf
*/
if ((areq->nbytes - i) < 64) {
while (i < areq->nbytes && in_i < mi.length && op->len < 64) {
/* how many bytes we can read from current SG */
@ -304,13 +338,21 @@ int sun4i_hash_update(struct ahash_request *areq)
sg_miter_stop(&mi);
/*
* End of data process
* Now if we have the flag final go to finalize part
* If not, store the partial hash
*/
if ((op->flags & SS_HASH_FINAL) > 0)
goto hash_final;
writel(op->mode | SS_ENABLED | SS_DATA_END, ss->base + SS_CTL);
i = 0;
do {
v = readl(ss->base + SS_CTL);
i++;
} while (i < SS_TIMEOUT && (v & SS_DATA_END) > 0);
if (i >= SS_TIMEOUT) {
if (unlikely(i >= SS_TIMEOUT)) {
dev_err_ratelimited(ss->dev,
"ERROR: hash end timeout %d>%d ctl=%x len=%u\n",
i, SS_TIMEOUT, v, areq->nbytes);
@ -318,56 +360,24 @@ int sun4i_hash_update(struct ahash_request *areq)
goto release_ss;
}
/* get the partial hash only if something was written */
for (i = 0; i < crypto_ahash_digestsize(tfm) / 4; i++)
op->hash[i] = readl(ss->base + SS_MD0 + i * 4);
release_ss:
writel(0, ss->base + SS_CTL);
spin_unlock_bh(&ss->slock);
return err;
}
goto release_ss;
/*
* sun4i_hash_final: finalize hashing operation
* hash_final: finalize hashing operation
*
* If we have some remaining bytes, we write them.
* Then ask the SS for finalizing the hashing operation
*
* I do not check RX FIFO size in this function since the size is 32
* after each enabling and this function neither write more than 32 words.
* If we come from the update part, we cannot have more than
* 3 remainings bytes to write and SS is fast enought to not care about it.
*/
int sun4i_hash_final(struct ahash_request *areq)
{
u32 v, ivmode = 0;
unsigned int i;
unsigned int j = 0;
int zeros, err = 0;
unsigned int index, padlen;
__be64 bits;
struct sun4i_req_ctx *op = ahash_request_ctx(areq);
struct sun4i_ss_ctx *ss = op->ss;
struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq);
u32 bf[32];
u32 wb = 0;
unsigned int nwait, nbw = 0;
dev_dbg(ss->dev, "%s: byte=%llu len=%u mode=%x wl=%u h=%x",
__func__, op->byte_count, areq->nbytes, op->mode,
op->len, op->hash[0]);
spin_lock_bh(&ss->slock);
/*
* if we have already written something,
* restore the partial hash state
*/
if (op->byte_count > 0) {
ivmode = SS_IV_ARBITRARY;
for (i = 0; i < crypto_ahash_digestsize(tfm) / 4; i++)
writel(op->hash[i], ss->base + SS_IV0 + i * 4);
}
writel(op->mode | SS_ENABLED | ivmode, ss->base + SS_CTL);
hash_final:
/* write the remaining words of the wait buffer */
if (op->len > 0) {
@ -436,7 +446,7 @@ int sun4i_hash_final(struct ahash_request *areq)
v = readl(ss->base + SS_CTL);
i++;
} while (i < SS_TIMEOUT && (v & SS_DATA_END) > 0);
if (i >= SS_TIMEOUT) {
if (unlikely(i >= SS_TIMEOUT)) {
dev_err_ratelimited(ss->dev,
"ERROR: hash end timeout %d>%d ctl=%x len=%u\n",
i, SS_TIMEOUT, v, areq->nbytes);
@ -463,30 +473,41 @@ release_ss:
return err;
}
int sun4i_hash_final(struct ahash_request *areq)
{
struct sun4i_req_ctx *op = ahash_request_ctx(areq);
op->flags = SS_HASH_FINAL;
return sun4i_hash(areq);
}
int sun4i_hash_update(struct ahash_request *areq)
{
struct sun4i_req_ctx *op = ahash_request_ctx(areq);
op->flags = SS_HASH_UPDATE;
return sun4i_hash(areq);
}
/* sun4i_hash_finup: finalize hashing operation after an update */
int sun4i_hash_finup(struct ahash_request *areq)
{
int err;
struct sun4i_req_ctx *op = ahash_request_ctx(areq);
err = sun4i_hash_update(areq);
if (err != 0)
return err;
return sun4i_hash_final(areq);
op->flags = SS_HASH_UPDATE | SS_HASH_FINAL;
return sun4i_hash(areq);
}
/* combo of init/update/final functions */
int sun4i_hash_digest(struct ahash_request *areq)
{
int err;
struct sun4i_req_ctx *op = ahash_request_ctx(areq);
err = sun4i_hash_init(areq);
if (err != 0)
return err;
err = sun4i_hash_update(areq);
if (err != 0)
return err;
return sun4i_hash_final(areq);
op->flags = SS_HASH_UPDATE | SS_HASH_FINAL;
return sun4i_hash(areq);
}

1
drivers/crypto/sunxi-ss/sun4i-ss.h
View File

@ -164,6 +164,7 @@ struct sun4i_req_ctx {
char buf[64];
unsigned int len;
struct sun4i_ss_ctx *ss;
int flags;
};
int sun4i_hash_crainit(struct crypto_tfm *tfm);