USB: xhci: Performance - move interrupt handlers into xhci-ring.c

Most of the work for interrupt handling is done in xhci-ring.c, so it makes
sense to move the functions that are first called when an interrupt happens
(xhci_irq() or xhci_msi_irq()) into xhci-ring.c, so that the compiler can better
optimize them.

Shorten some lines to make it pass checkpatch.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 7f1c545..4b50a02 100644 (file)
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2030,6 +2030,109 @@ 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,
+ * we might get bad data out of the event ring.  Section 4.10.2.7 has a list of
+ * indicators of an event TRB error, but we check the status *first* to be safe.
+ */
+irqreturn_t xhci_irq(struct usb_hcd *hcd)
+{
+       struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+       u32 temp, temp2;
+       union xhci_trb *trb;
+
+       spin_lock(&xhci->lock);
+       trb = xhci->event_ring->dequeue;
+       /* Check if the xHC generated the interrupt, or the irq is shared */
+       temp = xhci_readl(xhci, &xhci->op_regs->status);
+       temp2 = xhci_readl(xhci, &xhci->ir_set->irq_pending);
+       if (temp == 0xffffffff && temp2 == 0xffffffff)
+               goto hw_died;
+
+       if (!(temp & STS_EINT) && !ER_IRQ_PENDING(temp2)) {
+               spin_unlock(&xhci->lock);
+               xhci_warn(xhci, "Spurious interrupt.\n");
+               return IRQ_NONE;
+       }
+       xhci_dbg(xhci, "op reg status = %08x\n", temp);
+       xhci_dbg(xhci, "ir set irq_pending = %08x\n", temp2);
+       xhci_dbg(xhci, "Event ring dequeue ptr:\n");
+       xhci_dbg(xhci, "@%llx %08x %08x %08x %08x\n",
+                       (unsigned long long)
+                       xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, trb),
+                       lower_32_bits(trb->link.segment_ptr),
+                       upper_32_bits(trb->link.segment_ptr),
+                       (unsigned int) trb->link.intr_target,
+                       (unsigned int) trb->link.control);
+
+       if (temp & STS_FATAL) {
+               xhci_warn(xhci, "WARNING: Host System Error\n");
+               xhci_halt(xhci);
+hw_died:
+               xhci_to_hcd(xhci)->state = HC_STATE_HALT;
+               spin_unlock(&xhci->lock);
+               return -ESHUTDOWN;
+       }
+
+       xhci_work(xhci);
+       spin_unlock(&xhci->lock);
+
+       return IRQ_HANDLED;
+}
+
+irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd)
+{
+       irqreturn_t ret;
+
+       set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
+
+       ret = xhci_irq(hcd);
+
+       return ret;
+}
 
 /****          Endpoint Ring Operations        ****/
 

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index f5e0b00..d5c550e 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -172,17 +172,6 @@ int xhci_reset(struct xhci_hcd *xhci)
        return handshake(xhci, &xhci->op_regs->status, STS_CNR, 0, 250 * 1000);
 }
 
-static irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd)
-{
-       irqreturn_t ret;
-
-       set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
-
-       ret = xhci_irq(hcd);
-
-       return ret;
-}
-
 /*
  * Free IRQs
  * free all IRQs request
@@ -332,100 +321,8 @@ int xhci_init(struct usb_hcd *hcd)
        return retval;
 }
 
-/*
- * 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);
-       /* Flush posted writes */
-       xhci_readl(xhci, &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); the event ring should be 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,
- * we might get bad data out of the event ring.  Section 4.10.2.7 has a list of
- * indicators of an event TRB error, but we check the status *first* to be safe.
- */
-irqreturn_t xhci_irq(struct usb_hcd *hcd)
-{
-       struct xhci_hcd *xhci = hcd_to_xhci(hcd);
-       u32 temp, temp2;
-       union xhci_trb *trb;
-
-       spin_lock(&xhci->lock);
-       trb = xhci->event_ring->dequeue;
-       /* Check if the xHC generated the interrupt, or the irq is shared */
-       temp = xhci_readl(xhci, &xhci->op_regs->status);
-       temp2 = xhci_readl(xhci, &xhci->ir_set->irq_pending);
-       if (temp == 0xffffffff && temp2 == 0xffffffff)
-               goto hw_died;
-
-       if (!(temp & STS_EINT) && !ER_IRQ_PENDING(temp2)) {
-               spin_unlock(&xhci->lock);
-               return IRQ_NONE;
-       }
-       xhci_dbg(xhci, "op reg status = %08x\n", temp);
-       xhci_dbg(xhci, "ir set irq_pending = %08x\n", temp2);
-       xhci_dbg(xhci, "Event ring dequeue ptr:\n");
-       xhci_dbg(xhci, "@%llx %08x %08x %08x %08x\n",
-                       (unsigned long long)xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, trb),
-                       lower_32_bits(trb->link.segment_ptr),
-                       upper_32_bits(trb->link.segment_ptr),
-                       (unsigned int) trb->link.intr_target,
-                       (unsigned int) trb->link.control);
-
-       if (temp & STS_FATAL) {
-               xhci_warn(xhci, "WARNING: Host System Error\n");
-               xhci_halt(xhci);
-hw_died:
-               xhci_to_hcd(xhci)->state = HC_STATE_HALT;
-               spin_unlock(&xhci->lock);
-               return -ESHUTDOWN;
-       }
-
-       xhci_work(xhci);
-       spin_unlock(&xhci->lock);
-
-       return IRQ_HANDLED;
-}
 
 #ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
 void xhci_event_ring_work(unsigned long arg)

diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 9fe95c4..6d829c4 100644 (file)
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1371,6 +1371,7 @@ void xhci_stop(struct usb_hcd *hcd);
 void xhci_shutdown(struct usb_hcd *hcd);
 int xhci_get_frame(struct usb_hcd *hcd);
 irqreturn_t xhci_irq(struct usb_hcd *hcd);
+irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd);
 int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev);
 void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev);
 int xhci_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,