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PCI/x86: make early dump handle multi-function devices

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The early "dump PCI config space" code skips many multi-function
devices.  This patch fixes that, so it dumps all devices in PCI
domain 0.

We should not skip the rest of the functions if CLASS_REVISION is
0xffffffff.  Often multi-function devices have gaps in the function ID
space, e.g., 1c.0 and 1c.2 exist but 1c.1 doesn't.  The CLASS_REVISION
of the non-existent 1c.1 function will appear to be 0xffffffff.

We should only look at the HEADER_TYPE of function zero.  Often the
"multi-function" is set in function zero, but not in other functions.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Bjorn Helgaas 2009-01-14 10:04:25 -07:00 committed by Jesse Barnes
parent a1e4ee2286
commit 600914ba52
1 changed files with 8 additions and 5 deletions
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13
arch/x86/pci/early.c
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@ -96,18 +96,21 @@ void early_dump_pci_devices(void)
for (func = 0; func < 8; func++) {
u32 class;
u8 type;
class = read_pci_config(bus, slot, func,
PCI_CLASS_REVISION);
if (class == 0xffffffff)
break;
continue;
early_dump_pci_device(bus, slot, func);
/* No multi-function device? */
type = read_pci_config_byte(bus, slot, func,
if (func == 0) {
type = read_pci_config_byte(bus, slot,
func,
PCI_HEADER_TYPE);
if (!(type & 0x80))
break;
if (!(type & 0x80))
break;
}
}
}
}