xen/pciback: Print out the MSI/MSI-X (PIRQ) values

If the verbose_request is set (and loglevel high enough), print out
the MSI/MSI-X values that are sent to the guest. This should aid in
debugging issues.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

drivers/xen/xen-pciback/conf_space_capability_msi.c

@@ -16,6 +16,9 @@ int pciback_enable_msi(struct pciback_device *pdev,
 	int otherend = pdev->xdev->otherend_id;
 	int status;
 
+	if (unlikely(verbose_request))
+		printk(KERN_DEBUG "pciback: %s: enable MSI\n", pci_name(dev));
+
 	status = pci_enable_msi(dev);
 
 	if (status) {
@@ -29,19 +32,31 @@ int pciback_enable_msi(struct pciback_device *pdev,
 	 * the local domain's IRQ number. */
 
 	op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0;
+	if (unlikely(verbose_request))
+		printk(KERN_DEBUG "pciback: %s: MSI: %d\n", pci_name(dev),
+			op->value);
+
 	dev_data = pci_get_drvdata(dev);
 	if (dev_data)
 		dev_data->ack_intr = 0;
+
 	return 0;
 }
 
 int pciback_disable_msi(struct pciback_device *pdev,
 		struct pci_dev *dev, struct xen_pci_op *op)
 {
 	struct pciback_dev_data *dev_data;
+
+	if (unlikely(verbose_request))
+		printk(KERN_DEBUG "pciback: %s: disable MSI\n", pci_name(dev));
+
 	pci_disable_msi(dev);
 
 	op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0;
+	if (unlikely(verbose_request))
+		printk(KERN_DEBUG "pciback: %s: MSI: %d\n", pci_name(dev),
+			op->value);
 	dev_data = pci_get_drvdata(dev);
 	if (dev_data)
 		dev_data->ack_intr = 1;
@@ -55,6 +70,10 @@ int pciback_enable_msix(struct pciback_device *pdev,
 	int i, result;
 	struct msix_entry *entries;
 
+	if (unlikely(verbose_request))
+		printk(KERN_DEBUG "pciback: %s: enable MSI-X\n",
+		       pci_name(dev));
+
 	if (op->value > SH_INFO_MAX_VEC)
 		return -EINVAL;
 
@@ -75,6 +94,11 @@ int pciback_enable_msix(struct pciback_device *pdev,
 			if (entries[i].vector)
 				op->msix_entries[i].vector =
 					xen_pirq_from_irq(entries[i].vector);
+				if (unlikely(verbose_request))
+					printk(KERN_DEBUG "pciback: %s: " \
+						"MSI-X[%d]: %d\n",
+						pci_name(dev), i,
+						op->msix_entries[i].vector);
 		}
 	} else {
 		printk(KERN_WARNING "pciback: %s: failed to enable MSI-X: err %d!\n",
@@ -95,13 +119,20 @@ int pciback_disable_msix(struct pciback_device *pdev,
 {
 	struct pciback_dev_data *dev_data;
 
+	if (unlikely(verbose_request))
+		printk(KERN_DEBUG "pciback: %s: disable MSI-X\n",
+		       pci_name(dev));
+
 	pci_disable_msix(dev);
 
 	/*
 	 * SR-IOV devices (which don't have any legacy IRQ) have
 	 * an undefined IRQ value of zero.
 	 */
 	op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0;
+	if (unlikely(verbose_request))
+		printk(KERN_DEBUG "pciback: %s: MSI-X: %d\n", pci_name(dev),
+			op->value);
 	dev_data = pci_get_drvdata(dev);
 	if (dev_data)
 		dev_data->ack_intr = 1;