Hi,
Here I have a 8541 dev board, with 2 e1000 attached to pci0 and a
homebrewed addon board inserted into pci1. I am trying to make it work
under 2.6.26-rc8 (2.6.26 broken so I am working at rc8).
The ioports allocation reads
$ cat /proc/ioports
00000000-000fffff : /[EMAIL PROTECTED]
00001000-0000103f : 0000:00:0a.0
00001040-0000107f : 0000:00:0b.0
ffefe000-ffffdfff : /[EMAIL PROTECTED]
ffeff000-ffeff00f : 0001:01:0a.0
ffeff010-ffeff01f : 0001:01:0b.0
ffeff020-ffeff02f : 0001:01:0c.0
ffeff030-ffeff03f : 0001:01:0d.0
The port allocation for pci1 looks ridiculous. The addon board doesn't work.
After poking around, I find pci_process_bridge_OF_ranges() in
arch/powerpc/kernel/pci-common.c
--snip--
if (primary)
isa_io_base = (unsigned long)hose->io_base_virt;
--snip--
then fixup_resource(), _IO_BASE = isa_io_base. fix_resource will use
isa_io_base as base address to assign io port address space.
This is reasonable, but on my board, pci1's hose->io_base_virt is
smaller than pci0's. This lead to
[ 0.064214] PCI:0000:00:0a.0 Resource 4
0000000000001000-000000000000103f [20101] fixup...
[ 0.064224] fixup_resource() offset=00000000, io_base_virt=fdeb4000,
_IO_BASE=fdeb4000, io_base_phys=e2000000
[ 0.064232] PCI:0000:00:0a.0 0000000000001000-000000000000103f
[ 0.065129] PCI:0001:01:0a.0 Resource 2
0000000000001000-000000000000100f [20101] fixup...
[ 0.065139] fixup_resource() offset=ffefe000, io_base_virt=fddb2000,
_IO_BASE=fdeb4000, io_base_phys=e3000000
[ 0.065147] PCI:0001:01:0a.0 00000000ffeff000-00000000ffeff00f
offset = fddb2000 - fdeb4000 = ffefe000
So far, I think the workaround is to replace the code above with
--snip--
if (!isa_io_base)
isa_io_base = (unsigned long)hose->io_base_virt;
else if ((unsigned long)hose->io_base_virt < isa_io_base)
isa_io_base = (unsigned long)hose->io_base_virt;
--snip--
Then ioport allocation reads (But I haven't test if it works)
$ cat /proc/ioports
00000000-000fffff : /[EMAIL PROTECTED]
00001000-0000100f : 0001:01:0a.0
00001010-0000101f : 0001:01:0b.0
00001020-0000102f : 0001:01:0c.0
00001030-0000103f : 0001:01:0d.0
00102000-00201fff : /[EMAIL PROTECTED]
00103000-0010303f : 0000:00:0a.0
00103040-0010307f : 0000:00:0b.0
Can someone gives a better generic fix for this?
PS: I attach the kernel log (without workaround) for reference. I added
some printk code.
[ 0.064140] PCI: Found 0000:00:0a.0 [8086/1076] 000200 00
[ 0.064157] pci_read_bases(): IO: (0000:00:0a.0)
l=00001001,start=00001000,flag=00000000
[ 0.064172] pci 0000:00:0a.0: calling 0xc01e9f98
[ 0.064182] PCI:0000:00:0a.0 Resource 0 0000000080000000-000000008001ffff
[20204] fixup...
[ 0.064190] PCI:0000:00:0a.0 0000000080000000-000000008001ffff
[ 0.064198] PCI:0000:00:0a.0 Resource 2 0000000080020000-000000008002ffff
[20204] fixup...
[ 0.064206] PCI:0000:00:0a.0 0000000080020000-000000008002ffff
[ 0.064214] PCI:0000:00:0a.0 Resource 4 0000000000001000-000000000000103f
[20101] fixup...
[ 0.064224] fixup_resource() offset=00000000, io_base_virt=fdeb4000,
_IO_BASE=fdeb4000, io_base_phys=e2000000
[ 0.064232] PCI:0000:00:0a.0 0000000000001000-000000000000103f
[ 0.064241] PCI:0000:00:0a.0 Resource 6 0000000000000000-000000000000ffff
[27200] is unassigned
[ 0.064268] PCI: Found 0000:00:0b.0 [8086/1076] 000200 00
[ 0.064284] pci_read_bases(): IO: (0000:00:0b.0)
l=00001041,start=00001040,flag=00000000
[ 0.064300] pci 0000:00:0b.0: calling 0xc01e9f98
[ 0.064309] PCI:0000:00:0b.0 Resource 0 0000000080040000-000000008005ffff
[20204] fixup...
[ 0.064316] PCI:0000:00:0b.0 0000000080040000-000000008005ffff
[ 0.064325] PCI:0000:00:0b.0 Resource 2 0000000080060000-000000008006ffff
[20204] fixup...
[ 0.064353] PCI:0000:00:0b.0 0000000080060000-000000008006ffff
[ 0.064362] PCI:0000:00:0b.0 Resource 4 0000000000001040-000000000000107f
[20101] fixup...
[ 0.064371] fixup_resource() offset=00000000, io_base_virt=fdeb4000,
_IO_BASE=fdeb4000, io_base_phys=e2000000
[ 0.064379] PCI:0000:00:0b.0 0000000000001040-000000000000107f
[ 0.064388] PCI:0000:00:0b.0 Resource 6 0000000000000000-000000000000ffff
[27200] is unassigned
[ 0.064408] PCI: Fixups for bus 0000:00
[ 0.064413] PCI: Fixup bus 0 (PHB)
[ 0.064420] Try to map irq for 0000:00:00.0...
[ 0.064447] Try to map irq for 0000:00:0a.0...
[ 0.064459] -> got one, spec 2 cells (0x00000000 0x00000001...) on /[EMAIL
PROTECTED]/[EMAIL PROTECTED]
[ 0.064478] -> mapped to linux irq 16
[ 0.064482] Try to map irq for 0000:00:0b.0...
[ 0.064498] -> got one, spec 2 cells (0x00000001 0x00000001...) on /[EMAIL
PROTECTED]/[EMAIL PROTECTED]
[ 0.064510] -> mapped to linux irq 17
[ 0.064517] PCI: Bus scan for 0000:00 returning with max=00
[ 0.064973] PCI: Scanning bus 0001:01
[ 0.064989] PCI: Found 0001:01:00.0 [1057/000c] 000b20 00
[ 0.065011] pci 0001:01:00.0: calling fixup_hide_host_resource_fsl+0x0/0x50
[ 0.065024] pci 0001:01:00.0: calling 0xc01e9f98
[ 0.065055] PCI: Found 0001:01:0a.0 [104c/a106] 000000 00
[ 0.065069] pci_read_bases(): IO: (0001:01:0a.0)
l=00001001,start=00001000,flag=00000000
[ 0.065087] pci 0001:01:0a.0: calling 0xc01e9f98
[ 0.065097] PCI:0001:01:0a.0 Resource 0 00000000a0400000-00000000a07fffff
[21208] fixup...
[ 0.065105] PCI:0001:01:0a.0 00000000a0400000-00000000a07fffff
[ 0.065113] PCI:0001:01:0a.0 Resource 1 00000000a0800000-00000000a0ffffff
[20200] fixup...
[ 0.065121] PCI:0001:01:0a.0 00000000a0800000-00000000a0ffffff
[ 0.065129] PCI:0001:01:0a.0 Resource 2 0000000000001000-000000000000100f
[20101] fixup...
[ 0.065139] fixup_resource() offset=ffefe000, io_base_virt=fddb2000,
_IO_BASE=fdeb4000, io_base_phys=e3000000
[ 0.065147] PCI:0001:01:0a.0 00000000ffeff000-00000000ffeff00f
[ 0.065169] PCI: Found 0001:01:0b.0 [104c/a106] 000000 00
[ 0.065184] pci_read_bases(): IO: (0001:01:0b.0)
l=00001011,start=00001010,flag=00000000
[ 0.065202] pci 0001:01:0b.0: calling 0xc01e9f98
[ 0.065211] PCI:0001:01:0b.0 Resource 0 00000000a1000000-00000000a13fffff
[21208] fixup...
[ 0.065219] PCI:0001:01:0b.0 00000000a1000000-00000000a13fffff
[ 0.065227] PCI:0001:01:0b.0 Resource 1 00000000a1800000-00000000a1ffffff
[20200] fixup...
[ 0.065235] PCI:0001:01:0b.0 00000000a1800000-00000000a1ffffff
[ 0.065243] PCI:0001:01:0b.0 Resource 2 0000000000001010-000000000000101f
[20101] fixup...
[ 0.065253] fixup_resource() offset=ffefe000, io_base_virt=fddb2000,
_IO_BASE=fdeb4000, io_base_phys=e3000000
[ 0.065261] PCI:0001:01:0b.0 00000000ffeff010-00000000ffeff01f
[ 0.065284] PCI: Found 0001:01:0c.0 [104c/a106] 000000 00
[ 0.065298] pci_read_bases(): IO: (0001:01:0c.0)
l=00001021,start=00001020,flag=00000000
[ 0.065316] pci 0001:01:0c.0: calling 0xc01e9f98
[ 0.065325] PCI:0001:01:0c.0 Resource 0 00000000a2000000-00000000a23fffff
[21208] fixup...
[ 0.065333] PCI:0001:01:0c.0 00000000a2000000-00000000a23fffff
[ 0.065341] PCI:0001:01:0c.0 Resource 1 00000000a2800000-00000000a2ffffff
[20200] fixup...
[ 0.065360] PCI:0001:01:0c.0 00000000a2800000-00000000a2ffffff
[ 0.065369] PCI:0001:01:0c.0 Resource 2 0000000000001020-000000000000102f
[20101] fixup...
[ 0.065378] fixup_resource() offset=ffefe000, io_base_virt=fddb2000,
_IO_BASE=fdeb4000, io_base_phys=e3000000
[ 0.065387] PCI:0001:01:0c.0 00000000ffeff020-00000000ffeff02f
[ 0.065413] PCI: Found 0001:01:0d.0 [104c/a106] 000000 00
[ 0.065428] pci_read_bases(): IO: (0001:01:0d.0)
l=00001031,start=00001030,flag=00000000
[ 0.065447] pci 0001:01:0d.0: calling 0xc01e9f98
[ 0.065456] PCI:0001:01:0d.0 Resource 0 00000000a3000000-00000000a33fffff
[21208] fixup...
[ 0.065464] PCI:0001:01:0d.0 00000000a3000000-00000000a33fffff
[ 0.065472] PCI:0001:01:0d.0 Resource 1 00000000a3800000-00000000a3ffffff
[20200] fixup...
[ 0.065480] PCI:0001:01:0d.0 00000000a3800000-00000000a3ffffff
[ 0.065488] PCI:0001:01:0d.0 Resource 2 0000000000001030-000000000000103f
[20101] fixup...
[ 0.065498] fixup_resource() offset=ffefe000, io_base_virt=fddb2000,
_IO_BASE=fdeb4000, io_base_phys=e3000000
[ 0.065506] PCI:0001:01:0d.0 00000000ffeff030-00000000ffeff03f
[ 0.065527] PCI: Fixups for bus 0001:01
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