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Fix the code to look up the BIOS IRQ for a given link device by reading

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the IRQ set by the BIOS in existing devices to actually get the correct
bus number of the child PCI bus.  I was not reading the bus number from
the bridge device correctly.  The __BUS_ACCESSOR() macros (from which
pcib_get_bus() is built) assume that the passed in argument is a child
device.  However, at the time I'm reading the bus there is no child
device yet, so I was passing in the pcib device as the child device.
The parent of the pcib device probably returned an error in the case of
a host bridge, thus resulting in random stack garbage for the bus number.
For PCI-PCI bridges, the bus number being used was actually the subvendor
of the PCI-PCI bridge device itself.

MFC after:	1 week
This commit is contained in:
John Baldwin 2005-11-21 22:01:16 +00:00
parent f5e19c7342
commit a4104d1c3b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=152667
1 changed files with 15 additions and 3 deletions
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18
sys/dev/acpica/acpi_pci_link.c
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@ -608,7 +608,19 @@ acpi_pci_link_add_reference(device_t dev, int index, device_t pcib, int slot,
{
struct link *link;
uint8_t bios_irq;
uintptr_t bus;
/*
* Look up the PCI bus for the specified PCI bridge device. Note
* that the PCI bridge device might not have any children yet.
* However, looking up its bus number doesn't require a valid child
* device, so we just pass NULL.
*/
if (BUS_READ_IVAR(pcib, NULL, PCIB_IVAR_BUS, &bus) != 0) {
device_printf(pcib, "Unable to read PCI bus number");
panic("this is bad");
}
/* Bump the reference count. */
ACPI_SERIAL_BEGIN(pci_link);
link = acpi_pci_link_lookup(dev, index);
@ -619,7 +631,7 @@ acpi_pci_link_add_reference(device_t dev, int index, device_t pcib, int slot,
pci_link_interrupt_weights[link->l_irq]++;
/* Try to find a BIOS IRQ setting from any matching devices. */
bios_irq = acpi_pci_link_search_irq(pcib_get_bus(pcib), slot, pin);
bios_irq = acpi_pci_link_search_irq(bus, slot, pin);
if (!PCI_INTERRUPT_VALID(bios_irq)) {
ACPI_SERIAL_END(pci_link);
return;
@ -628,7 +640,7 @@ acpi_pci_link_add_reference(device_t dev, int index, device_t pcib, int slot,
/* Validate the BIOS IRQ. */
if (!link_valid_irq(link, bios_irq)) {
device_printf(dev, "BIOS IRQ %u for %d.%d.INT%c is invalid\n",
bios_irq, pcib_get_bus(pcib), slot, pin + 'A');
bios_irq, (int)bus, slot, pin + 'A');
} else if (!PCI_INTERRUPT_VALID(link->l_bios_irq)) {
link->l_bios_irq = bios_irq;
if (bios_irq < NUM_ISA_INTERRUPTS)
@ -641,7 +653,7 @@ acpi_pci_link_add_reference(device_t dev, int index, device_t pcib, int slot,
} else if (bios_irq != link->l_bios_irq)
device_printf(dev,
"BIOS IRQ %u for %d.%d.INT%c does not match previous BIOS IRQ %u\n",
bios_irq, pcib_get_bus(pcib), slot, pin + 'A',
bios_irq, (int)bus, slot, pin + 'A',
link->l_bios_irq);
ACPI_SERIAL_END(pci_link);
}