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-kristo@xxxxxx>
---
drivers/crypto/omap-sham.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index 7fb9eef..8e7e1582 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -2051,9 +2051,47 @@ 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_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,
};
--
1.9.1
--
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