The tulip driver fails to initialize in a Linux VM running on Hyper-V.
The following messages are logged in syslog when trying to load the tulip
driver:
tulip: Linux Tulip drivers version 1.1.15 (Feb 27, 2007)
tulip: 0000:00:0a.0: PCI INT A: failed to register GSI
tulip: Cannot enable tulip board #0, aborting
tulip: probe of 0000:00:0a.0 failed with error -16
The tulip drivers initialization function tulip_init_one() calls
pci_enable_device(). The call to pci_enable_device() eventually
results in a call to alloc_isa_irq_from_domain(), which returns -EBUSY (-16)
The message "tulip: 0000:00:0a.0: PCI INT A: failed to register GSI" is
logged by acpi_pci_irq_enable().
The flow of calls to the error is returned is:
acpi_pci_irq_enable() - Logs the message "PCI INT A: failed to register GSI"
acpi_register_gsi()
__acpi_register_gsi() is afunction pointer -> acpi_register_gsi_ioapic()
acpi_register_gsi_ioapic()
mp_map_gsi_to_irq()
mp_map_ppin_to_irq()
alloc_isa_irq_from_domain()
Returning -EBUSY when mp_check_pin_attr() returns false.
mp_check_pin_attr()
data->trigger = 1
data->polarity = 0
info->ioapic_trigger = 1
info->ioapic_polarity = 1
mp_check_pin_attr() returns false because the two polarity values do
not match.
acpi_register_gsi_ioapic() is setting trigger and polarity to:
trigger = 1
polarity = 1
mp_check_pin_attr() is calling irq_get_chip_data(irq) which is returning a
mp_chip_data structure with
trigger = 1
polarity = 0
Since the two polarity values do not match, mp_check_pin_attr() returns false.
Broken in 3.19.0 kernel
Works in 3.17 kernel.
Using commits to arch/x86/kernel/acpi/boot.c as reference, the commit where the
issue appears is
cd68f6bd53cf89d1d5ed889b8aaf65e9c3574a079
x86, irq, acpi: Git rid of special handling of GSI for ACPI SCI
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https://bugs.launchpad.net/bugs/1440072
Title:
[Hyper-V] Legacy network adapter is not detected
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