From 62f7c708ff2f45ef4e6bffb1ae2e6ee2b0fc09c6 Mon Sep 17 00:00:00 2001 From: Tero Kristo Date: Tue, 27 Feb 2018 15:30:37 +0200 Subject: crypto: omap-sham - make queue length configurable 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 Signed-off-by: Herbert Xu --- 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 7fb9eef4e724..8e7e1582ef69 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, }; -- cgit v1.2.3