PCI memory configuration

[Frank Kaiser]

Hello

 

It looks as if we have a serious problem with the PCI device driver. The
driver just takes over the PCI memory configuration from the BIOS, and
it turns out that the current BIOS of the IVI platform assigns memory
block with a minimum address increment of 1 kB. The outcome is that the
register addresses of the 3 SDHCI controllers and the EHCI controller
reside in one 4 kB page. Since Genode seems to always assign one page to
each device, it only can handle the first controller found. Trying to
allocate resources to the next controllers results in errors:

Genode::Io_mem_session_component::Dataspace_attr
Genode::Io_mem_session_component::_prepare_io_mem(const char*,
Genode::Range_allocator*): I/O memory [bfe57000,bfe58000) not available

Genode::Io_mem_session_component::Io_mem_session_component(Genode::Range
_allocator*, Genode::Range_allocator*, Genode::Server_entrypoint*, const
char*): Local MMIO mapping failed!

[init -> test-dde_os_linux26_mmc] request_mem_region() failed (start
bfe57400, size 100)<4>PCI: Unable to reserve mem region #1:100 at ...26...
for device 0000:00:0a.0

The PCI memoty map is as follows:

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 8100 (base class
0x6)

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 8108 (base class
0x3)

[init -> test-pci]   Resource 0 (MEM): base=0xbfe80000 size=0x00080000

[init -> test-pci]   Resource 1 (I/O): base=0x0000e880 size=0x00000008

[init -> test-pci]   Resource 2 (MEM): base=0xb0000000 size=0x08000000

[init -> test-pci]   Resource 3 (MEM): base=0xbfe60000 size=0x00020000

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 811b (base class
0x4)

[init -> test-pci]   Resource 0 (MEM): base=0xbfe58000 size=0x00004000

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 8110 (base class
0x6)

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 8112 (base class
0x6)

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 8114 (base class
0xc)

[init -> test-pci]   Resource 4 (I/O): base=0x0000e480 size=0x00000020

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 8115 (base class
0xc)

[init -> test-pci]   Resource 4 (I/O): base=0x0000e080 size=0x00000020

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 8116 (base class
0xc)

[init -> test-pci]   Resource 4 (I/O): base=0x0000d880 size=0x00000020

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 8117 (base class
0xc)

[init -> test-pci]   Resource 0 (MEM): base=0xbfe57c00 size=0x00000400

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 811c (base class
0x8)

[init -> test-pci]   Resource 0 (MEM): base=0xbfe57800 size=0x00000100

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 811d (base class
0x8)

[init -> test-pci]   Resource 0 (MEM): base=0xbfe57400 size=0x00000100

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 811e (base class
0x8)

[init -> test-pci]   Resource 0 (MEM): base=0xbfe57000 size=0x00000100

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 8119 (base class
0x6)

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 811a (base class
0x1)

[init -> test-pci]   Resource 4 (I/O): base=0x0000ffa0 size=0x00000010

[init -> test-pci] Vendor ID: 8086 (Intel) Device ID: 4232 (base class
0x2)

[init -> test-pci]   Resource 0 (MEM): base=0xbfffe000 size=0x00002000

[init -> test-pci] Vendor ID: 10ee (unknown) Device ID: a123 (base class
0x8)

[init -> test-pci]   Resource 0 (MEM): base=0xdc000000 size=0x04000000

[init -> test-pci]   Resource 1 (MEM): base=0xdbfffc00 size=0x00000100

[init -> test-pci]   Resource 2 (MEM): base=0xdbfff800 size=0x00000100

[init -> test-pci]   Resource 3 (MEM): base=0xc0000000 size=0x10000000

For the time being we require only one SDHCI controller so that we could
omit the initialisation over the other two, but this still leaves the
problem with the conflicting address assignment of the EHCI controller.
I see only two solutions:

1.       Make Genode dealing with PCI memory resources smaller than 4
kB.

2.       If #1 is not affordable, let the PCI driver reassign the memory
resources with a minimum increment of 4 kB.

I'd like to get some hints how to proceed.

 

Regards

Frank

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