diff options
Diffstat (limited to 'drivers/crypto')
| -rw-r--r-- | drivers/crypto/omap-sham.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c index 33bea520f50a..855898977d38 100644 --- a/drivers/crypto/omap-sham.c +++ b/drivers/crypto/omap-sham.c @@ -112,6 +112,8 @@ #define FLAGS_DMA_READY 6 #define FLAGS_AUTO_XOR 7 #define FLAGS_BE32_SHA1 8 +#define FLAGS_SGS_COPIED 9 +#define FLAGS_SGS_ALLOCED 10 /* context flags */ #define FLAGS_FINUP 16 #define FLAGS_SG 17 @@ -151,8 +153,10 @@ struct omap_sham_reqctx { /* walk state */ struct scatterlist *sg; + struct scatterlist sgl[2]; struct scatterlist sgl_tmp; unsigned int offset; /* offset in current sg */ + int sg_len; unsigned int total; /* total request */ u8 buffer[0] OMAP_ALIGNED; @@ -223,6 +227,7 @@ struct omap_sham_dev { struct dma_chan *dma_lch; struct tasklet_struct done_task; u8 polling_mode; + u8 xmit_buf[BUFLEN]; unsigned long flags; struct crypto_queue queue; @@ -626,6 +631,260 @@ static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr, return -EINPROGRESS; } +static int omap_sham_copy_sg_lists(struct omap_sham_reqctx *ctx, + struct scatterlist *sg, int bs, int new_len) +{ + int n = sg_nents(sg); + struct scatterlist *tmp; + int offset = ctx->offset; + + if (ctx->bufcnt) + n++; + + ctx->sg = kmalloc_array(n, sizeof(*sg), GFP_KERNEL); + if (!ctx->sg) + return -ENOMEM; + + sg_init_table(ctx->sg, n); + + tmp = ctx->sg; + + ctx->sg_len = 0; + + if (ctx->bufcnt) { + sg_set_buf(tmp, ctx->dd->xmit_buf, ctx->bufcnt); + tmp = sg_next(tmp); + ctx->sg_len++; + } + + while (sg && new_len) { + int len = sg->length - offset; + + if (offset) { + offset -= sg->length; + if (offset < 0) + offset = 0; + } + + if (new_len < len) + len = new_len; + + if (len > 0) { + new_len -= len; + sg_set_page(tmp, sg_page(sg), len, sg->offset); + if (new_len <= 0) + sg_mark_end(tmp); + tmp = sg_next(tmp); + ctx->sg_len++; + } + + sg = sg_next(sg); + } + + set_bit(FLAGS_SGS_ALLOCED, &ctx->dd->flags); + + ctx->bufcnt = 0; + + return 0; +} + +static int omap_sham_copy_sgs(struct omap_sham_reqctx *ctx, + struct scatterlist *sg, int bs, int new_len) +{ + int pages; + void *buf; + int len; + + len = new_len + ctx->bufcnt; + + pages = get_order(ctx->total); + + buf = (void *)__get_free_pages(GFP_ATOMIC, pages); + if (!buf) { + pr_err("Couldn't allocate pages for unaligned cases.\n"); + return -ENOMEM; + } + + if (ctx->bufcnt) + memcpy(buf, ctx->dd->xmit_buf, ctx->bufcnt); + + scatterwalk_map_and_copy(buf + ctx->bufcnt, sg, ctx->offset, + ctx->total - ctx->bufcnt, 0); + sg_init_table(ctx->sgl, 1); + sg_set_buf(ctx->sgl, buf, len); + ctx->sg = ctx->sgl; + set_bit(FLAGS_SGS_COPIED, &ctx->dd->flags); + ctx->sg_len = 1; + ctx->bufcnt = 0; + ctx->offset = 0; + + return 0; +} + +static int omap_sham_align_sgs(struct scatterlist *sg, + int nbytes, int bs, bool final, + struct omap_sham_reqctx *rctx) +{ + int n = 0; + bool aligned = true; + bool list_ok = true; + struct scatterlist *sg_tmp = sg; + int new_len; + int offset = rctx->offset; + + if (!sg || !sg->length || !nbytes) + return 0; + + new_len = nbytes; + + if (offset) + list_ok = false; + + if (final) + new_len = DIV_ROUND_UP(new_len, bs) * bs; + else + new_len = new_len / bs * bs; + + while (nbytes > 0 && sg_tmp) { + n++; + + if (offset < sg_tmp->length) { + if (!IS_ALIGNED(offset + sg_tmp->offset, 4)) { + aligned = false; + break; + } + + if (!IS_ALIGNED(sg_tmp->length - offset, bs)) { + aligned = false; + break; + } + } + + if (offset) { + offset -= sg_tmp->length; + if (offset < 0) { + nbytes += offset; + offset = 0; + } + } else { + nbytes -= sg_tmp->length; + } + + sg_tmp = sg_next(sg_tmp); + + if (nbytes < 0) { + list_ok = false; + break; + } + } + + if (!aligned) + return omap_sham_copy_sgs(rctx, sg, bs, new_len); + else if (!list_ok) + return omap_sham_copy_sg_lists(rctx, sg, bs, new_len); + + rctx->sg_len = n; + rctx->sg = sg; + + return 0; +} + +static int omap_sham_prepare_request(struct ahash_request *req, bool update) +{ + struct omap_sham_reqctx *rctx = ahash_request_ctx(req); + int bs; + int ret; + int nbytes; + bool final = rctx->flags & BIT(FLAGS_FINUP); + int xmit_len, hash_later; + + if (!req) + return 0; + + bs = get_block_size(rctx); + + if (update) + nbytes = req->nbytes; + else + nbytes = 0; + + rctx->total = nbytes + rctx->bufcnt; + + if (!rctx->total) + return 0; + + if (nbytes && (!IS_ALIGNED(rctx->bufcnt, bs))) { + int len = bs - rctx->bufcnt % bs; + + if (len > nbytes) + len = nbytes; + scatterwalk_map_and_copy(rctx->buffer + rctx->bufcnt, req->src, + 0, len, 0); + rctx->bufcnt += len; + nbytes -= len; + rctx->offset = len; + } + + if (rctx->bufcnt) + memcpy(rctx->dd->xmit_buf, rctx->buffer, rctx->bufcnt); + + ret = omap_sham_align_sgs(req->src, nbytes, bs, final, rctx); + if (ret) + return ret; + + xmit_len = rctx->total; + + if (!IS_ALIGNED(xmit_len, bs)) { + if (final) + xmit_len = DIV_ROUND_UP(xmit_len, bs) * bs; + else + xmit_len = xmit_len / bs * bs; + } + + hash_later = rctx->total - xmit_len; + if (hash_later < 0) + hash_later = 0; + + if (rctx->bufcnt && nbytes) { + /* have data from previous operation and current */ + sg_init_table(rctx->sgl, 2); + sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, rctx->bufcnt); + + sg_chain(rctx->sgl, 2, req->src); + + rctx->sg = rctx->sgl; + + rctx->sg_len++; + } else if (rctx->bufcnt) { + /* have buffered data only */ + sg_init_table(rctx->sgl, 1); + sg_set_buf(rctx->sgl, rctx->dd->xmit_buf, xmit_len); + + rctx->sg = rctx->sgl; + + rctx->sg_len = 1; + } + + if (hash_later) { + if (req->nbytes) { + scatterwalk_map_and_copy(rctx->buffer, req->src, + req->nbytes - hash_later, + hash_later, 0); + } else { + memcpy(rctx->buffer, rctx->buffer + xmit_len, + hash_later); + } + rctx->bufcnt = hash_later; + } else { + rctx->bufcnt = 0; + } + + if (!final) + rctx->total = xmit_len; + + return 0; +} + static size_t omap_sham_append_buffer(struct omap_sham_reqctx *ctx, const u8 *data, size_t length) { @@ -1040,6 +1299,10 @@ retry: dd->req = req; ctx = ahash_request_ctx(req); + err = omap_sham_prepare_request(NULL, ctx->op == OP_UPDATE); + if (err) + goto err1; + dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n", ctx->op, req->nbytes); |