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crypto: omap-sham - 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. Default fallback
size of 256 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 15:30:36 +02:00 committed by Herbert Xu
parent 065fa2523d
commit c9af5995d5
1 changed files with 53 additions and 3 deletions
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56
drivers/crypto/omap-sham.c
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@ -229,6 +229,7 @@ struct omap_sham_dev {
u8 xmit_buf[BUFLEN] OMAP_ALIGNED;
unsigned long flags;
int fallback_sz;
struct crypto_queue queue;
struct ahash_request *req;
@ -1009,7 +1010,7 @@ static int omap_sham_update_req(struct omap_sham_dev *dd)
ctx->total, ctx->digcnt, (ctx->flags & BIT(FLAGS_FINUP)) != 0);
if (ctx->total < get_block_size(ctx) ||
ctx->total < OMAP_SHA_DMA_THRESHOLD)
ctx->total < dd->fallback_sz)
ctx->flags |= BIT(FLAGS_CPU);
if (ctx->flags & BIT(FLAGS_CPU))
@ -1265,11 +1266,11 @@ static int omap_sham_final(struct ahash_request *req)
/*
* OMAP HW accel works only with buffers >= 9.
* HMAC is always >= 9 because ipad == block size.
* If buffersize is less than DMA_THRESHOLD, we use fallback
* If buffersize is less than fallback_sz, we use fallback
* SW encoding, as using DMA + HW in this case doesn't provide
* any benefit.
*/
if (!ctx->digcnt && ctx->bufcnt < OMAP_SHA_DMA_THRESHOLD)
if (!ctx->digcnt && ctx->bufcnt < ctx->dd->fallback_sz)
return omap_sham_final_shash(req);
else if (ctx->bufcnt)
return omap_sham_enqueue(req, OP_FINAL);
@ -2020,6 +2021,47 @@ static int omap_sham_get_res_pdev(struct omap_sham_dev *dd,
return err;
}
static ssize_t fallback_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->fallback_sz);
}
static ssize_t fallback_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;
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;
}
dd->fallback_sz = value;
return size;
}
static DEVICE_ATTR_RW(fallback);
static struct attribute *omap_sham_attrs[] = {
&dev_attr_fallback.attr,
NULL,
};
static struct attribute_group omap_sham_attr_group = {
.attrs = omap_sham_attrs,
};
static int omap_sham_probe(struct platform_device *pdev)
{
struct omap_sham_dev *dd;
@ -2081,6 +2123,8 @@ static int omap_sham_probe(struct platform_device *pdev)
pm_runtime_use_autosuspend(dev);
pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
dd->fallback_sz = OMAP_SHA_DMA_THRESHOLD;
pm_runtime_enable(dev);
pm_runtime_irq_safe(dev);
@ -2118,6 +2162,12 @@ static int omap_sham_probe(struct platform_device *pdev)
}
}
err = sysfs_create_group(&dev->kobj, &omap_sham_attr_group);
if (err) {
dev_err(dev, "could not create sysfs device attrs\n");
goto err_algs;
}
return 0;
err_algs: