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crypto: talitos - Preempt overflow interrupts

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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>
This commit is contained in:
Kim Phillips 2008-07-17 20:16:40 +08:00 committed by Herbert Xu
parent 695ad58969
commit ec6644d632
1 changed files with 22 additions and 5 deletions
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27
drivers/crypto/talitos.c
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@ -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) {