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authorKim Phillips <kim.phillips@freescale.com>2008-07-17 20:16:40 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2008-07-17 20:16:40 +0800
commitec6644d6325b5a38525f1d5b20fd4bf7db05cf2a (patch)
treefd5c1d22f84212026b98dc7fd92dcbd900f44c40 /drivers/crypto/talitos.c
parent695ad589698571046d42a4450c2d801486905535 (diff)
downloadlinux-linaro-stable-ec6644d6325b5a38525f1d5b20fd4bf7db05cf2a.tar.gz
crypto: talitos - Preempt overflow interrupts
add requests pending/submit count to prevent request queue full condition by preempting h/w overflow interrupts in software. We do this due to the delay in the delivery and handling of the channel overflow error interrupt. Signed-off-by: Kim Phillips <kim.phillips@freescale.com> Acked-by: Lee Nipper <lee.nipper@freescale.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/talitos.c')
-rw-r--r--drivers/crypto/talitos.c27
1 files changed, 22 insertions, 5 deletions
diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index f644fba35c8c..fdb0680f6ffe 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -99,6 +99,9 @@ struct talitos_private {
/* next channel to be assigned next incoming descriptor */
atomic_t last_chan;
+ /* per-channel number of requests pending in channel h/w fifo */
+ atomic_t *submit_count;
+
/* per-channel request fifo */
struct talitos_request **fifo;
@@ -263,15 +266,15 @@ static int talitos_submit(struct device *dev, struct talitos_desc *desc,
spin_lock_irqsave(&priv->head_lock[ch], flags);
- head = priv->head[ch];
- request = &priv->fifo[ch][head];
-
- if (request->desc) {
- /* request queue is full */
+ if (!atomic_inc_not_zero(&priv->submit_count[ch])) {
+ /* h/w fifo is full */
spin_unlock_irqrestore(&priv->head_lock[ch], flags);
return -EAGAIN;
}
+ head = priv->head[ch];
+ request = &priv->fifo[ch][head];
+
/* map descriptor and save caller data */
request->dma_desc = dma_map_single(dev, desc, sizeof(*desc),
DMA_BIDIRECTIONAL);
@@ -335,6 +338,9 @@ static void flush_channel(struct device *dev, int ch, int error, int reset_ch)
priv->tail[ch] = (tail + 1) & (priv->fifo_len - 1);
spin_unlock_irqrestore(&priv->tail_lock[ch], flags);
+
+ atomic_dec(&priv->submit_count[ch]);
+
saved_req.callback(dev, saved_req.desc, saved_req.context,
status);
/* channel may resume processing in single desc error case */
@@ -1337,6 +1343,7 @@ static int __devexit talitos_remove(struct of_device *ofdev)
if (hw_supports(dev, DESC_HDR_SEL0_RNG))
talitos_unregister_rng(dev);
+ kfree(priv->submit_count);
kfree(priv->tail);
kfree(priv->head);
@@ -1501,6 +1508,16 @@ static int talitos_probe(struct of_device *ofdev,
}
}
+ priv->submit_count = kmalloc(sizeof(int) * priv->num_channels,
+ GFP_KERNEL);
+ if (!priv->submit_count) {
+ dev_err(dev, "failed to allocate fifo submit count space\n");
+ err = -ENOMEM;
+ goto err_out;
+ }
+ for (i = 0; i < priv->num_channels; i++)
+ atomic_set(&priv->submit_count[i], -priv->chfifo_len);
+
priv->head = kzalloc(sizeof(int) * priv->num_channels, GFP_KERNEL);
priv->tail = kzalloc(sizeof(int) * priv->num_channels, GFP_KERNEL);
if (!priv->head || !priv->tail) {