diff options
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/i386/drivers/net/undinet.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/arch/i386/drivers/net/undinet.c b/src/arch/i386/drivers/net/undinet.c index 6205c809b..e956b989a 100644 --- a/src/arch/i386/drivers/net/undinet.c +++ b/src/arch/i386/drivers/net/undinet.c @@ -531,6 +531,53 @@ static struct net_device_operations undinet_operations = { .irq = undinet_irq, }; +/** A device with broken support for generating interrupts */ +struct undinet_irq_broken { + /** PCI vendor ID */ + uint16_t pci_vendor; + /** PCI device ID */ + uint16_t pci_device; +}; + +/** + * List of devices with broken support for generating interrupts + * + * Some PXE stacks are known to claim that IRQs are supported, but + * then never generate interrupts. No satisfactory solution has been + * found to this problem; the workaround is to add the PCI vendor and + * device IDs to this list. This is something of a hack, since it + * will generate false positives for identical devices with a working + * PXE stack (e.g. those that have been reflashed with iPXE), but it's + * an improvement on the current situation. + */ +static const struct undinet_irq_broken undinet_irq_broken_list[] = { + /* HP XX70x laptops */ + { .pci_vendor = 0x8086, .pci_device = 0x1502 }, + { .pci_vendor = 0x8086, .pci_device = 0x1503 }, +}; + +/** + * Check for devices with broken support for generating interrupts + * + * @v undi UNDI device + * @ret irq_is_broken Interrupt support is broken; no interrupts are generated + */ +static int undinet_irq_is_broken ( struct undi_device *undi ) { + const struct undinet_irq_broken *broken; + unsigned int i; + + for ( i = 0 ; i < ( sizeof ( undinet_irq_broken_list ) / + sizeof ( undinet_irq_broken_list[0] ) ) ; i++ ) { + broken = &undinet_irq_broken_list[i]; + if ( ( undi->dev.desc.bus_type == BUS_TYPE_PCI ) && + ( undi->dev.desc.vendor == broken->pci_vendor ) && + ( undi->dev.desc.device == broken->pci_device ) ) { + return 1; + } + } + return 0; +} + /** * Probe UNDI device * @@ -647,6 +694,11 @@ int undinet_probe ( struct undi_device *undi ) { undinic ); undinic->hacks |= UNDI_HACK_EB54; } + if ( undinet_irq_is_broken ( undi ) ) { + DBGC ( undinic, "UNDINIC %p forcing polling mode due to " + "broken interrupts\n", undinic ); + undinic->irq_supported = 0; + } /* Register network device */ if ( ( rc = register_netdev ( netdev ) ) != 0 ) |