video: tegra: nvmap: implement fast api functions
[linux-2.6.git] / drivers / pci / irq.c
1 /*
2  * PCI IRQ failure handing code
3  *
4  * Copyright (c) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
5  */
6
7 #include <linux/acpi.h>
8 #include <linux/device.h>
9 #include <linux/kernel.h>
10 #include <linux/export.h>
11 #include <linux/pci.h>
12
13 static void pci_note_irq_problem(struct pci_dev *pdev, const char *reason)
14 {
15         struct pci_dev *parent = to_pci_dev(pdev->dev.parent);
16
17         dev_printk(KERN_ERR, &pdev->dev,
18                    "Potentially misrouted IRQ (Bridge %s %04x:%04x)\n",
19                    dev_name(&parent->dev), parent->vendor, parent->device);
20         dev_printk(KERN_ERR, &pdev->dev, "%s\n", reason);
21         dev_printk(KERN_ERR, &pdev->dev, "Please report to linux-kernel@vger.kernel.org\n");
22         WARN_ON(1);
23 }
24
25 /**
26  * pci_lost_interrupt - reports a lost PCI interrupt
27  * @pdev:       device whose interrupt is lost
28  * 
29  * The primary function of this routine is to report a lost interrupt
30  * in a standard way which users can recognise (instead of blaming the
31  * driver).
32  *
33  * Returns:
34  *  a suggestion for fixing it (although the driver is not required to
35  * act on this).
36  */
37 enum pci_lost_interrupt_reason pci_lost_interrupt(struct pci_dev *pdev)
38 {
39         if (pdev->msi_enabled || pdev->msix_enabled) {
40                 enum pci_lost_interrupt_reason ret;
41
42                 if (pdev->msix_enabled) {
43                         pci_note_irq_problem(pdev, "MSIX routing failure");
44                         ret = PCI_LOST_IRQ_DISABLE_MSIX;
45                 } else {
46                         pci_note_irq_problem(pdev, "MSI routing failure");
47                         ret = PCI_LOST_IRQ_DISABLE_MSI;
48                 }
49                 return ret;
50         }
51 #ifdef CONFIG_ACPI
52         if (!(acpi_disabled || acpi_noirq)) {
53                 pci_note_irq_problem(pdev, "Potential ACPI misrouting please reboot with acpi=noirq");
54                 /* currently no way to fix acpi on the fly */
55                 return PCI_LOST_IRQ_DISABLE_ACPI;
56         }
57 #endif
58         pci_note_irq_problem(pdev, "unknown cause (not MSI or ACPI)");
59         return PCI_LOST_IRQ_NO_INFORMATION;
60 }
61 EXPORT_SYMBOL(pci_lost_interrupt);