From bda531452c143b0bafe3dd6567dbfe9274009345 Mon Sep 17 00:00:00 2001 From: Sarah Sharp Date: Thu, 29 Jul 2010 22:12:38 -0700 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-ring.c | 73 +++++++++++++++--------------------- 1 file changed, 30 insertions(+), 43 deletions(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 4b50a02ba114..f9c08d2fe33a 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -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; -- 2.30.2