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authorLee Nipper <lee.nipper@freescale.com>2008-10-12 20:29:34 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2008-12-25 11:01:10 +1100
commit1c2e8811eea5f0c5da3213ea206c2864fa4614fd (patch)
tree1d1a227e268bef3bd7ce1df189dacee29cbf1937 /drivers/crypto/talitos.c
parent40405f10b853ef404b395c6febca71b0de185490 (diff)
downloadlinux-linaro-stable-1c2e8811eea5f0c5da3213ea206c2864fa4614fd.tar.gz
crypto: talitos - Implement done interrupt mitigation
In talitos_interrupt, upon one done interrupt, mask further done interrupts, and ack only any error interrupt. In talitos_done, unmask done interrupts after completing processing. In flush_channel, ack each done channel processed. Keep done overflow interrupts masked because even though each pkt is ack'ed, a few done overflows still occur. Signed-off-by: Lee Nipper <lee.nipper@freescale.com> Signed-off-by: Kim Phillips <kim.phillips@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.c30
1 files changed, 22 insertions, 8 deletions
diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index c429f684c79d..b5c2c9340a9c 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -319,9 +319,11 @@ static void flush_channel(struct device *dev, int ch, int error, int reset_ch)
/* descriptors with their done bits set don't get the error */
rmb();
- if ((request->desc->hdr & DESC_HDR_DONE) == DESC_HDR_DONE)
+ if ((request->desc->hdr & DESC_HDR_DONE) == DESC_HDR_DONE) {
status = 0;
- else
+ /* Ack each pkt completed on channel */
+ out_be32(priv->reg + TALITOS_ICR, (1 << (ch * 2)));
+ } else
if (!error)
break;
else
@@ -369,6 +371,11 @@ static void talitos_done(unsigned long data)
for (ch = 0; ch < priv->num_channels; ch++)
flush_channel(dev, ch, 0, 0);
+
+ /* At this point, all completed channels have been processed.
+ * Unmask done interrupts for channels completed later on.
+ */
+ setbits32(priv->reg + TALITOS_IMR, TALITOS_IMR_DONE);
}
/*
@@ -557,15 +564,22 @@ static irqreturn_t talitos_interrupt(int irq, void *data)
isr = in_be32(priv->reg + TALITOS_ISR);
isr_lo = in_be32(priv->reg + TALITOS_ISR_LO);
- /* ack */
- out_be32(priv->reg + TALITOS_ICR, isr);
- out_be32(priv->reg + TALITOS_ICR_LO, isr_lo);
+ if (unlikely((isr & ~TALITOS_ISR_CHDONE) || isr_lo)) {
+ /*
+ * Acknowledge error interrupts here.
+ * Done interrupts are ack'ed as part of done_task.
+ */
+ out_be32(priv->reg + TALITOS_ICR, isr);
+ out_be32(priv->reg + TALITOS_ICR_LO, isr_lo);
- if (unlikely((isr & ~TALITOS_ISR_CHDONE) || isr_lo))
talitos_error((unsigned long)data, isr, isr_lo);
- else
- if (likely(isr & TALITOS_ISR_CHDONE))
+ } else
+ if (likely(isr & TALITOS_ISR_CHDONE)) {
+ /* mask further done interrupts. */
+ clrbits32(priv->reg + TALITOS_IMR, TALITOS_IMR_DONE);
+ /* done_task will unmask done interrupts at exit */
tasklet_schedule(&priv->done_task);
+ }
return (isr || isr_lo) ? IRQ_HANDLED : IRQ_NONE;
}