1 files changed, 99 insertions, 7 deletions

diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index 86b89ace836f..ad02aa63b519 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -229,6 +229,7 @@ struct omap_sham_dev {
 	u8			xmit_buf[BUFLEN] OMAP_ALIGNED;
 
 	unsigned long		flags;
+	int			fallback_sz;
 	struct crypto_queue	queue;
 	struct ahash_request	*req;
 
@@ -759,6 +760,13 @@ static int omap_sham_align_sgs(struct scatterlist *sg,
 	while (nbytes > 0 && sg_tmp) {
 		n++;
 
+#ifdef CONFIG_ZONE_DMA
+		if (page_zonenum(sg_page(sg_tmp)) != ZONE_DMA) {
+			aligned = false;
+			break;
+		}
+#endif
+
 		if (offset < sg_tmp->length) {
 			if (!IS_ALIGNED(offset + sg_tmp->offset, 4)) {
 				aligned = false;
@@ -809,9 +817,6 @@ static int omap_sham_prepare_request(struct ahash_request *req, bool update)
 	bool final = rctx->flags & BIT(FLAGS_FINUP);
 	int xmit_len, hash_later;
 
-	if (!req)
-		return 0;
-
 	bs = get_block_size(rctx);
 
 	if (update)
@@ -1002,7 +1007,7 @@ static int omap_sham_update_req(struct omap_sham_dev *dd)
 		 ctx->total, ctx->digcnt, (ctx->flags & BIT(FLAGS_FINUP)) != 0);
 
 	if (ctx->total < get_block_size(ctx) ||
-	    ctx->total < OMAP_SHA_DMA_THRESHOLD)
+	    ctx->total < dd->fallback_sz)
 		ctx->flags |= BIT(FLAGS_CPU);
 
 	if (ctx->flags & BIT(FLAGS_CPU))
@@ -1258,11 +1263,11 @@ static int omap_sham_final(struct ahash_request *req)
 	/*
 	 * OMAP HW accel works only with buffers >= 9.
 	 * HMAC is always >= 9 because ipad == block size.
-	 * If buffersize is less than DMA_THRESHOLD, we use fallback
+	 * If buffersize is less than fallback_sz, we use fallback
 	 * SW encoding, as using DMA + HW in this case doesn't provide
 	 * any benefit.
 	 */
-	if (!ctx->digcnt && ctx->bufcnt < OMAP_SHA_DMA_THRESHOLD)
+	if (!ctx->digcnt && ctx->bufcnt < ctx->dd->fallback_sz)
 		return omap_sham_final_shash(req);
 	else if (ctx->bufcnt)
 		return omap_sham_enqueue(req, OP_FINAL);
@@ -1761,7 +1766,7 @@ static void omap_sham_done_task(unsigned long data)
 		if (test_and_clear_bit(FLAGS_OUTPUT_READY, &dd->flags)) {
 			/* hash or semi-hash ready */
 			clear_bit(FLAGS_DMA_READY, &dd->flags);
-				goto finish;
+			goto finish;
 		}
 	}
 
@@ -2013,6 +2018,85 @@ err:
 	return err;
 }
 
+static ssize_t fallback_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct omap_sham_dev *dd = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", dd->fallback_sz);
+}
+
+static ssize_t fallback_store(struct device *dev, struct device_attribute *attr,
+			      const char *buf, size_t size)
+{
+	struct omap_sham_dev *dd = dev_get_drvdata(dev);
+	ssize_t status;
+	long value;
+
+	status = kstrtol(buf, 0, &value);
+	if (status)
+		return status;
+
+	/* HW accelerator only works with buffers > 9 */
+	if (value < 9) {
+		dev_err(dev, "minimum fallback size 9\n");
+		return -EINVAL;
+	}
+
+	dd->fallback_sz = value;
+
+	return size;
+}
+
+static ssize_t queue_len_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	struct omap_sham_dev *dd = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", dd->queue.max_qlen);
+}
+
+static ssize_t queue_len_store(struct device *dev,
+			       struct device_attribute *attr, const char *buf,
+			       size_t size)
+{
+	struct omap_sham_dev *dd = dev_get_drvdata(dev);
+	ssize_t status;
+	long value;
+	unsigned long flags;
+
+	status = kstrtol(buf, 0, &value);
+	if (status)
+		return status;
+
+	if (value < 1)
+		return -EINVAL;
+
+	/*
+	 * Changing the queue size in fly is safe, if size becomes smaller
+	 * than current size, it will just not accept new entries until
+	 * it has shrank enough.
+	 */
+	spin_lock_irqsave(&dd->lock, flags);
+	dd->queue.max_qlen = value;
+	spin_unlock_irqrestore(&dd->lock, flags);
+
+	return size;
+}
+
+static DEVICE_ATTR_RW(queue_len);
+static DEVICE_ATTR_RW(fallback);
+
+static struct attribute *omap_sham_attrs[] = {
+	&dev_attr_queue_len.attr,
+	&dev_attr_fallback.attr,
+	NULL,
+};
+
+static struct attribute_group omap_sham_attr_group = {
+	.attrs = omap_sham_attrs,
+};
+
 static int omap_sham_probe(struct platform_device *pdev)
 {
 	struct omap_sham_dev *dd;
@@ -2074,6 +2158,8 @@ static int omap_sham_probe(struct platform_device *pdev)
 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
 
+	dd->fallback_sz = OMAP_SHA_DMA_THRESHOLD;
+
 	pm_runtime_enable(dev);
 	pm_runtime_irq_safe(dev);
 
@@ -2111,6 +2197,12 @@ static int omap_sham_probe(struct platform_device *pdev)
 		}
 	}
 
+	err = sysfs_create_group(&dev->kobj, &omap_sham_attr_group);
+	if (err) {
+		dev_err(dev, "could not create sysfs device attrs\n");
+		goto err_algs;
+	}
+
 	return 0;
 
 err_algs: