From: Dmitry Kasatkin Subject: [PATCH 4/5] omap-aes: error handling implementation improved Date: Wed, 10 Nov 2010 19:26:55 +0200 Message-ID: References: Cc: linux-crypto@vger.kernel.org, linux-omap@vger.kernel.org To: herbert@gondor.hengli.com.au Return-path: Received: from smtp.nokia.com ([147.243.128.24]:20074 "EHLO mgw-da01.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757196Ab0KJR1a (ORCPT ); Wed, 10 Nov 2010 12:27:30 -0500 In-Reply-To: In-Reply-To: References: Sender: linux-crypto-owner@vger.kernel.org List-ID: Previous version had not error handling. Request could remain uncompleted. Also in the case of DMA error, FLAGS_INIT is unset and accelerator will be initialized again. Buffer size allignment is checked. Signed-off-by: Dmitry Kasatkin --- drivers/crypto/omap-aes.c | 135 +++++++++++++++++++++++++++++++-------------- 1 files changed, 94 insertions(+), 41 deletions(-) diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c index a4d0ef4..704c9d1 100644 --- a/drivers/crypto/omap-aes.c +++ b/drivers/crypto/omap-aes.c @@ -104,14 +104,16 @@ struct omap_aes_dev { struct omap_aes_ctx *ctx; struct device *dev; unsigned long flags; + int err; u32 *iv; u32 ctrl; - spinlock_t lock; - struct crypto_queue queue; + spinlock_t lock; + struct crypto_queue queue; - struct tasklet_struct task; + struct tasklet_struct done_task; + struct tasklet_struct queue_task; struct ablkcipher_request *req; size_t total; @@ -180,8 +182,6 @@ static int omap_aes_wait(struct omap_aes_dev *dd, u32 offset, u32 bit) static int omap_aes_hw_init(struct omap_aes_dev *dd) { - int err; - clk_enable(dd->iclk); if (!(dd->flags & FLAGS_INIT)) { @@ -200,25 +200,32 @@ static int omap_aes_hw_init(struct omap_aes_dev *dd) AES_REG_SYSSTATUS_RESETDONE)) { clk_disable(dd->iclk); return -ETIMEDOUT; + } dd->flags |= FLAGS_INIT; + dd->err = 0; } return 0; } -static void omap_aes_write_ctrl(struct omap_aes_dev *dd) +static int omap_aes_write_ctrl(struct omap_aes_dev *dd) { unsigned int key32; - int i; + int i, err, init = dd->flags & FLAGS_INIT; u32 val, mask; + err = omap_aes_hw_init(dd); + if (err) + return err; + val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3); if (dd->flags & FLAGS_CBC) val |= AES_REG_CTRL_CBC; if (dd->flags & FLAGS_ENCRYPT) val |= AES_REG_CTRL_DIRECTION; - if (dd->ctrl == val && !(dd->flags & FLAGS_NEW_IV) && + /* check if hw state & mode have not changed */ + if (init && dd->ctrl == val && !(dd->flags & FLAGS_NEW_IV) && !(dd->ctx->flags & FLAGS_NEW_KEY)) goto out; @@ -260,6 +267,8 @@ out: /* start DMA or disable idle mode */ omap_aes_write_mask(dd, AES_REG_MASK, AES_REG_MASK_START, AES_REG_MASK_START); + + return 0; } static struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_ctx *ctx) @@ -287,8 +296,16 @@ static void omap_aes_dma_callback(int lch, u16 ch_status, void *data) { struct omap_aes_dev *dd = data; - if (lch == dd->dma_lch_out) - tasklet_schedule(&dd->task); + if (ch_status != OMAP_DMA_BLOCK_IRQ) { + pr_err("omap-aes DMA error status: 0x%hx\n", ch_status); + dd->err = -EIO; + dd->flags &= ~FLAGS_INIT; /* request to re-initialize */ + } else if (lch == dd->dma_lch_in) { + return; + } + + /* dma_lch_out - completed */ + tasklet_schedule(&dd->done_task); } static int omap_aes_dma_init(struct omap_aes_dev *dd) @@ -393,6 +410,11 @@ static int sg_copy(struct scatterlist **sg, size_t *offset, void *buf, if (!count) return off; + /* + * buflen and total are AES_BLOCK_SIZE size aligned, + * so count should be also aligned + */ + sg_copy_buf(buf + off, *sg, *offset, count, out); off += count; @@ -418,6 +440,7 @@ static int omap_aes_crypt_dma(struct crypto_tfm *tfm, dma_addr_t dma_addr_in, struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm); struct omap_aes_dev *dd = ctx->dd; int len32; + int err; pr_debug("len: %d\n", length); @@ -457,11 +480,13 @@ static int omap_aes_crypt_dma(struct crypto_tfm *tfm, dma_addr_t dma_addr_in, omap_set_dma_dest_params(dd->dma_lch_out, 0, OMAP_DMA_AMODE_POST_INC, dma_addr_out, 0, 0); + err = omap_aes_write_ctrl(dd); + if (err) + return err; + omap_start_dma(dd->dma_lch_in); omap_start_dma(dd->dma_lch_out); - omap_aes_write_ctrl(dd); - return 0; } @@ -487,8 +512,10 @@ static int omap_aes_crypt_dma_start(struct omap_aes_dev *dd) count = min(dd->total, sg_dma_len(dd->in_sg)); count = min(count, sg_dma_len(dd->out_sg)); - if (count != dd->total) + if (count != dd->total) { + pr_err("request length != buffer length\n"); return -EINVAL; + } pr_debug("fast\n"); @@ -524,25 +551,28 @@ static int omap_aes_crypt_dma_start(struct omap_aes_dev *dd) dd->total -= count; - err = omap_aes_hw_init(dd); - err = omap_aes_crypt_dma(tfm, addr_in, addr_out, count); + if (err) { + dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); + dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE); + } return err; } static void omap_aes_finish_req(struct omap_aes_dev *dd, int err) { + struct ablkcipher_request *req = dd->req; struct omap_aes_ctx *ctx; pr_debug("err: %d\n", err); dd->flags &= ~FLAGS_BUSY; - ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(dd->req)); + ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req)); - if (!dd->total) - dd->req->base.complete(&dd->req->base, err); + if (req->base.complete) + req->base.complete(&req->base, err); } static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd) @@ -554,11 +584,11 @@ static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd) omap_aes_write_mask(dd, AES_REG_MASK, 0, AES_REG_MASK_START); - clk_disable(dd->iclk); - omap_stop_dma(dd->dma_lch_in); omap_stop_dma(dd->dma_lch_out); + clk_disable(dd->iclk); + if (dd->flags & FLAGS_FAST) { dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE); dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); @@ -575,27 +605,24 @@ static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd) } } - if (err || !dd->total) - omap_aes_finish_req(dd, err); - return err; } -static int omap_aes_handle_req(struct omap_aes_dev *dd, +static int omap_aes_handle_queue(struct omap_aes_dev *dd, struct ablkcipher_request *req) { struct crypto_async_request *async_req, *backlog; struct omap_aes_ctx *ctx; struct omap_aes_reqctx *rctx; unsigned long flags; - int err; + int err, ret = 0; spin_lock_irqsave(&dd->lock, flags); if (req) - err = ablkcipher_enqueue_request(&dd->queue, req); + ret = ablkcipher_enqueue_request(&dd->queue, req); if (dd->flags & FLAGS_BUSY) { spin_unlock_irqrestore(&dd->lock, flags); - return err; + return ret; } async_req = crypto_dequeue_request(&dd->queue); if (async_req) { @@ -605,7 +632,7 @@ static int omap_aes_handle_req(struct omap_aes_dev *dd, spin_unlock_irqrestore(&dd->lock, flags); if (!async_req) - return 0; + return ret; if (backlog) backlog->complete(backlog, -EINPROGRESS); @@ -640,28 +667,46 @@ static int omap_aes_handle_req(struct omap_aes_dev *dd, ctx->flags |= FLAGS_NEW_KEY; } - if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) - pr_err("request size is not exact amount of AES blocks\n"); + err = omap_aes_crypt_dma_start(dd); + if (err) { + /* aes_task will not finish it, so do it here */ + omap_aes_finish_req(dd, err); + tasklet_schedule(&dd->queue_task); + } - return omap_aes_crypt_dma_start(dd); + return ret; /* return ret, which is enqueue return value */ } -static void omap_aes_task(unsigned long data) +static void omap_aes_done_task(unsigned long data) { struct omap_aes_dev *dd = (struct omap_aes_dev *)data; + int err; pr_debug("enter\n"); - omap_aes_crypt_dma_stop(dd); + err = omap_aes_crypt_dma_stop(dd); - if (dd->total) - omap_aes_crypt_dma_start(dd); - else - omap_aes_handle_req(dd, NULL); + err = dd->err ? : err; + + if (dd->total && !err) { + err = omap_aes_crypt_dma_start(dd); + if (!err) + return; /* DMA started. Not fininishing. */ + } + + omap_aes_finish_req(dd, err); + omap_aes_handle_queue(dd, NULL); pr_debug("exit\n"); } +static void omap_aes_queue_task(unsigned long data) +{ + struct omap_aes_dev *dd = (struct omap_aes_dev *)data; + + omap_aes_handle_queue(dd, NULL); +} + static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode) { struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx( @@ -673,13 +718,18 @@ static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode) !!(mode & FLAGS_ENCRYPT), !!(mode & FLAGS_CBC)); + if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) { + pr_err("request size is not exact amount of AES blocks\n"); + return -EINVAL; + } + dd = omap_aes_find_dev(ctx); if (!dd) return -ENODEV; rctx->mode = mode; - return omap_aes_handle_req(dd, req); + return omap_aes_handle_queue(dd, req); } /* ********************** ALG API ************************************ */ @@ -845,7 +895,8 @@ static int omap_aes_probe(struct platform_device *pdev) (reg & AES_REG_REV_MAJOR) >> 4, reg & AES_REG_REV_MINOR); clk_disable(dd->iclk); - tasklet_init(&dd->task, omap_aes_task, (unsigned long)dd); + tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd); + tasklet_init(&dd->queue_task, omap_aes_queue_task, (unsigned long)dd); err = omap_aes_dma_init(dd); if (err) @@ -872,7 +923,8 @@ err_algs: crypto_unregister_alg(&algs[j]); omap_aes_dma_cleanup(dd); err_dma: - tasklet_kill(&dd->task); + tasklet_kill(&dd->done_task); + tasklet_kill(&dd->queue_task); iounmap(dd->io_base); err_io: clk_put(dd->iclk); @@ -899,7 +951,8 @@ static int omap_aes_remove(struct platform_device *pdev) for (i = 0; i < ARRAY_SIZE(algs); i++) crypto_unregister_alg(&algs[i]); - tasklet_kill(&dd->task); + tasklet_kill(&dd->done_task); + tasklet_kill(&dd->queue_task); omap_aes_dma_cleanup(dd); iounmap(dd->io_base); clk_put(dd->iclk); -- 1.7.0.4