@@ -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:
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> --- drivers/crypto/omap-sham.c | 56 +++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 53 insertions(+), 3 deletions(-) -- 1.9.1 -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html