Crypto driver queue size can now be configured from userspace. This
allows optimizing the queue usage based on use case. Default queue
size is still 10 entries.

Signed-off-by: Tero Kristo <t-kri...@ti.com>
---
 drivers/crypto/omap-aes.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index 76bc94f..250880a 100644
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -1058,9 +1058,52 @@ static ssize_t fallback_store(struct device *dev, struct 
device_attribute *attr,
        return size;
 }
 
+static ssize_t queue_len_show(struct device *dev, struct device_attribute 
*attr,
+                             char *buf)
+{
+       struct omap_aes_dev *dd = dev_get_drvdata(dev);
+
+       return sprintf(buf, "%d\n", dd->engine->queue.max_qlen);
+}
+
+static ssize_t queue_len_store(struct device *dev,
+                              struct device_attribute *attr, const char *buf,
+                              size_t size)
+{
+       struct omap_aes_dev *dd;
+       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_bh(&list_lock);
+       list_for_each_entry(dd, &dev_list, list) {
+               spin_lock_irqsave(&dd->lock, flags);
+               dd->engine->queue.max_qlen = value;
+               dd->aead_queue.base.max_qlen = value;
+               spin_unlock_irqrestore(&dd->lock, flags);
+       }
+       spin_unlock_bh(&list_lock);
+
+       return size;
+}
+
+static DEVICE_ATTR_RW(queue_len);
 static DEVICE_ATTR_RW(fallback);
 
 static struct attribute *omap_aes_attrs[] = {
+       &dev_attr_queue_len.attr,
        &dev_attr_fallback.attr,
        NULL,
 };
-- 
1.9.1

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