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authorMark Lord <liml@rtr.ca>2008-05-17 13:38:00 -0400
committerJeff Garzik <jgarzik@redhat.com>2008-05-19 17:30:11 -0400
commit96e2c487933e5f69e98fffdcae2c35c78a671c07 (patch)
tree418ff66ed6e6aaaef8775e1b6d03d6c799fc6b4c /drivers/ata
parenta44253d24a97ec3efe601267274a5fb64d8696c1 (diff)
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sata_mv: cache main_irq_mask register in hpriv
Part five of simplifying/fixing handling of the main_irq_mask register to resolve unexpected interrupt issues observed in 2.6.26-rc*. Keep a cached copy of the main_irq_mask so that we don't have to stall the CPU to read it on every pass through mv_interrupt. This significantly speeds up interrupt handling, both for sata_mv, and for any other driver/device sharing the same PCI IRQ line. Signed-off-by: Mark Lord <mlord@pobox.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/sata_mv.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index eb7f3da..2d8a7e8 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -458,6 +458,7 @@ struct mv_port_signal {
struct mv_host_priv {
u32 hp_flags;
+ u32 main_irq_mask;
struct mv_port_signal signal[8];
const struct mv_hw_ops *ops;
int n_ports;
@@ -843,10 +844,12 @@ static void mv_set_main_irq_mask(struct ata_host *host,
struct mv_host_priv *hpriv = host->private_data;
u32 old_mask, new_mask;
- old_mask = readl(hpriv->main_irq_mask_addr);
+ old_mask = hpriv->main_irq_mask;
new_mask = (old_mask & ~disable_bits) | enable_bits;
- if (new_mask != old_mask)
+ if (new_mask != old_mask) {
+ hpriv->main_irq_mask = new_mask;
writelfl(new_mask, hpriv->main_irq_mask_addr);
+ }
}
static void mv_enable_port_irqs(struct ata_port *ap,
@@ -2200,12 +2203,11 @@ static irqreturn_t mv_interrupt(int irq, void *dev_instance)
struct ata_host *host = dev_instance;
struct mv_host_priv *hpriv = host->private_data;
unsigned int handled = 0;
- u32 main_irq_cause, main_irq_mask, pending_irqs;
+ u32 main_irq_cause, pending_irqs;
spin_lock(&host->lock);
main_irq_cause = readl(hpriv->main_irq_cause_addr);
- main_irq_mask = readl(hpriv->main_irq_mask_addr);
- pending_irqs = main_irq_cause & main_irq_mask;
+ pending_irqs = main_irq_cause & hpriv->main_irq_mask;
/*
* Deal with cases where we either have nothing pending, or have read
* a bogus register value which can indicate HW removal or PCI fault.