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crypto: omap-aes - make fallback size configurable

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Crypto driver fallback size can now be configured from userspace. This
allows optimizing the DMA usage based on use case. Detault fallback
size of 200 is still used.

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 15:30:38 +02:00 committed by Herbert Xu
parent 62f7c708ff
commit 537c62ca12
1 changed files with 47 additions and 1 deletions
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48
drivers/crypto/omap-aes.c
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@ -47,6 +47,8 @@
static LIST_HEAD(dev_list);
static DEFINE_SPINLOCK(list_lock);
static int aes_fallback_sz = 200;
#ifdef DEBUG
#define omap_aes_read(dd, offset) \
({ \
@ -519,7 +521,7 @@ static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
!!(mode & FLAGS_ENCRYPT),
!!(mode & FLAGS_CBC));
if (req->nbytes < 200) {
if (req->nbytes < aes_fallback_sz) {
SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
skcipher_request_set_tfm(subreq, ctx->fallback);
@ -1040,6 +1042,44 @@ err:
return err;
}
static ssize_t fallback_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", aes_fallback_sz);
}
static ssize_t fallback_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t size)
{
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;
}
aes_fallback_sz = value;
return size;
}
static DEVICE_ATTR_RW(fallback);
static struct attribute *omap_aes_attrs[] = {
&dev_attr_fallback.attr,
NULL,
};
static struct attribute_group omap_aes_attr_group = {
.attrs = omap_aes_attrs,
};
static int omap_aes_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -1168,6 +1208,12 @@ static int omap_aes_probe(struct platform_device *pdev)
}
}
err = sysfs_create_group(&dev->kobj, &omap_aes_attr_group);
if (err) {
dev_err(dev, "could not create sysfs device attrs\n");
goto err_aead_algs;
}
return 0;
err_aead_algs:
for (i = dd->pdata->aead_algs_info->registered - 1; i >= 0; i--) {