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USB: xhci: Performance - move xhci_work() into xhci_irq() 

When we move xhci_work() into xhci_irq(), we don't need to read the operational
register status field twice.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Sarah Sharp 2010-07-29 22:12:38 -07:00 коммит произвёл Greg Kroah-Hartman
Родитель 9032cd5279
Коммит bda531452c
1 изменённых файлов: 30 добавлений и 43 удалений
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73
drivers/usb/host/xhci-ring.c
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@ -2030,48 +2030,6 @@ void xhci_handle_event(struct xhci_hcd *xhci)
/* Are there more items on the event ring? */
xhci_handle_event(xhci);
}
/*
* Called in interrupt context when there might be work
* queued on the event ring
*
* xhci->lock must be held by caller.
*/
static void xhci_work(struct xhci_hcd *xhci)
{
u32 temp;
u64 temp_64;
/*
* Clear the op reg interrupt status first,
* so we can receive interrupts from other MSI-X interrupters.
* Write 1 to clear the interrupt status.
*/
temp = xhci_readl(xhci, &xhci->op_regs->status);
temp |= STS_EINT;
xhci_writel(xhci, temp, &xhci->op_regs->status);
/* FIXME when MSI-X is supported and there are multiple vectors */
/* Clear the MSI-X event interrupt status */
/* Acknowledge the interrupt */
temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
temp |= 0x3;
xhci_writel(xhci, temp, &xhci->ir_set->irq_pending);
if (xhci->xhc_state & XHCI_STATE_DYING)
xhci_dbg(xhci, "xHCI dying, ignoring interrupt. "
"Shouldn't IRQs be disabled?\n");
else
/* FIXME this should be a delayed service routine
* that clears the EHB.
*/
xhci_handle_event(xhci);
/* Clear the event handler busy flag (RW1C); event ring is empty. */
temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
xhci_write_64(xhci, temp_64 | ERST_EHB, &xhci->ir_set->erst_dequeue);
/* Flush posted writes -- FIXME is this necessary? */
xhci_readl(xhci, &xhci->ir_set->irq_pending);
}
/*
* xHCI spec says we can get an interrupt, and if the HC has an error condition,
@ -2083,6 +2041,7 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
u32 temp, temp2;
union xhci_trb *trb;
u64 temp_64;
spin_lock(&xhci->lock);
trb = xhci->event_ring->dequeue;
@ -2117,7 +2076,35 @@ hw_died:
return -ESHUTDOWN;
}
xhci_work(xhci);
/*
* Clear the op reg interrupt status first,
* so we can receive interrupts from other MSI-X interrupters.
* Write 1 to clear the interrupt status.
*/
temp |= STS_EINT;
xhci_writel(xhci, temp, &xhci->op_regs->status);
/* FIXME when MSI-X is supported and there are multiple vectors */
/* Clear the MSI-X event interrupt status */
/* Acknowledge the interrupt */
temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
temp |= 0x3;
xhci_writel(xhci, temp, &xhci->ir_set->irq_pending);
if (xhci->xhc_state & XHCI_STATE_DYING)
xhci_dbg(xhci, "xHCI dying, ignoring interrupt. "
"Shouldn't IRQs be disabled?\n");
else
/* FIXME this should be a delayed service routine
* that clears the EHB.
*/
xhci_handle_event(xhci);
/* Clear the event handler busy flag (RW1C); event ring is empty. */
temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
xhci_write_64(xhci, temp_64 | ERST_EHB, &xhci->ir_set->erst_dequeue);
/* Flush posted writes -- FIXME is this necessary? */
xhci_readl(xhci, &xhci->ir_set->irq_pending);
spin_unlock(&xhci->lock);
return IRQ_HANDLED;