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crypto: omap-aes - make queue length configurable

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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@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tero Kristo 2018-02-27 15:30:39 +02:00 committed by Herbert Xu
parent 537c62ca12
commit 5007387fc0
1 changed files with 43 additions and 0 deletions
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43
drivers/crypto/omap-aes.c
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@ -1069,9 +1069,52 @@ 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,
};