From 6242332ff2f3431c4fb6f4b21581f38f16569c13 Mon Sep 17 00:00:00 2001 From: Joel Fernandes Date: Sat, 17 Aug 2013 21:42:32 -0500 Subject: [PATCH] crypto: omap-aes - Add support for cases of unaligned lengths For cases where offset/length of on any page of the input SG is not aligned by AES_BLOCK_SIZE, we copy all the pages from the input SG list into a contiguous buffer and prepare a single element SG list for this buffer with length as the total bytes to crypt. This is requried for cases such as when an SG list of 16 bytes total size contains 16 pages each containing 1 byte. DMA using the direct buffers of such instances is not possible. For this purpose, we first detect if the unaligned case and accordingly allocate enough number of pages to satisfy the request and prepare SG lists. We then copy data into the buffer, and copy data out of it on completion. Signed-off-by: Joel Fernandes Signed-off-by: Herbert Xu --- drivers/crypto/omap-aes.c | 86 +++++++++++++++++++++++++++++++++++++-- 1 file changed, 83 insertions(+), 3 deletions(-) diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c index 7a08a152838a..2fd22ca6a58f 100644 --- a/drivers/crypto/omap-aes.c +++ b/drivers/crypto/omap-aes.c @@ -158,9 +158,23 @@ struct omap_aes_dev { struct tasklet_struct queue_task; struct ablkcipher_request *req; + + /* + * total is used by PIO mode for book keeping so introduce + * variable total_save as need it to calc page_order + */ size_t total; + size_t total_save; + struct scatterlist *in_sg; struct scatterlist *out_sg; + + /* Buffers for copying for unaligned cases */ + struct scatterlist in_sgl; + struct scatterlist out_sgl; + struct scatterlist *orig_out; + int sgs_copied; + struct scatter_walk in_walk; struct scatter_walk out_walk; int dma_in; @@ -537,12 +551,51 @@ static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd) dmaengine_terminate_all(dd->dma_lch_in); dmaengine_terminate_all(dd->dma_lch_out); - dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE); - dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len, DMA_FROM_DEVICE); - return err; } +int omap_aes_check_aligned(struct scatterlist *sg) +{ + while (sg) { + if (!IS_ALIGNED(sg->offset, 4)) + return -1; + if (!IS_ALIGNED(sg->length, AES_BLOCK_SIZE)) + return -1; + sg = sg_next(sg); + } + return 0; +} + +int omap_aes_copy_sgs(struct omap_aes_dev *dd) +{ + void *buf_in, *buf_out; + int pages; + + pages = get_order(dd->total); + + buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages); + buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages); + + if (!buf_in || !buf_out) { + pr_err("Couldn't allocated pages for unaligned cases.\n"); + return -1; + } + + dd->orig_out = dd->out_sg; + + sg_copy_buf(buf_in, dd->in_sg, 0, dd->total, 0); + + sg_init_table(&dd->in_sgl, 1); + sg_set_buf(&dd->in_sgl, buf_in, dd->total); + dd->in_sg = &dd->in_sgl; + + sg_init_table(&dd->out_sgl, 1); + sg_set_buf(&dd->out_sgl, buf_out, dd->total); + dd->out_sg = &dd->out_sgl; + + return 0; +} + static int omap_aes_handle_queue(struct omap_aes_dev *dd, struct ablkcipher_request *req) { @@ -576,9 +629,19 @@ static int omap_aes_handle_queue(struct omap_aes_dev *dd, /* assign new request to device */ dd->req = req; dd->total = req->nbytes; + dd->total_save = req->nbytes; dd->in_sg = req->src; dd->out_sg = req->dst; + if (omap_aes_check_aligned(dd->in_sg) || + omap_aes_check_aligned(dd->out_sg)) { + if (omap_aes_copy_sgs(dd)) + pr_err("Failed to copy SGs for unaligned cases\n"); + dd->sgs_copied = 1; + } else { + dd->sgs_copied = 0; + } + dd->in_sg_len = scatterwalk_bytes_sglen(dd->in_sg, dd->total); dd->out_sg_len = scatterwalk_bytes_sglen(dd->out_sg, dd->total); BUG_ON(dd->in_sg_len < 0 || dd->out_sg_len < 0); @@ -606,14 +669,31 @@ static int omap_aes_handle_queue(struct omap_aes_dev *dd, static void omap_aes_done_task(unsigned long data) { struct omap_aes_dev *dd = (struct omap_aes_dev *)data; + void *buf_in, *buf_out; + int pages; pr_debug("enter done_task\n"); if (!dd->pio_only) { dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len, DMA_FROM_DEVICE); + dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE); + dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len, + DMA_FROM_DEVICE); omap_aes_crypt_dma_stop(dd); } + + if (dd->sgs_copied) { + buf_in = sg_virt(&dd->in_sgl); + buf_out = sg_virt(&dd->out_sgl); + + sg_copy_buf(buf_out, dd->orig_out, 0, dd->total_save, 1); + + pages = get_order(dd->total_save); + free_pages((unsigned long)buf_in, pages); + free_pages((unsigned long)buf_out, pages); + } + omap_aes_finish_req(dd, 0); omap_aes_handle_queue(dd, NULL); -- 2.20.1