ichwd0: unable to reserve GCS registers

Test Rat ttsestt at gmail.com
Wed Aug 3 17:23:38 UTC 2011

John Baldwin <jhb at freebsd.org> writes:

> On Wednesday, August 03, 2011 4:49:24 am Test Rat wrote:
>> Doug Barton <dougb at FreeBSD.org> writes:
>> > On 08/02/2011 15:06, John Baldwin wrote:
>> >> On Saturday, July 30, 2011 2:49:52 am Andriy Gapon wrote:
>> >>> on 19/07/2011 18:16 John Baldwin said the following:
>> >>>> Hmm, can you get devinfo -r output from a working kernel with ichwd loaded?  
>> >>>> You might be able to just build the kernel with 'nooptions NEW_PCIB'.
>> >>>
>> >>> I believe that I've got a similar problem with amdsbwd(4).
>> >>> It needs some resources (I/O ports) that belong to ACPI.
>> >>> The problem is that the driver attaches to isa bus which is under
>> >>> isab->pci->pcib and those particular resources are not assigned to the Host-PCI
>> >>> bridge.
>> >>>
>> >>> I think that you already made a suggestion that perhaps isa bus should  directly
>> >>> attach to acpi bus when acpi is available.  Not sure if there are any
>> >>> alternative approaches.
>> >> 
>> >> Can you try this:
>> >
>> > Not so much. :) the first and last patches I can apply to HEAD by hand,
>> > but /sys/dev/acpica/acpi_pcib_acpi.c is only 387 lines long, so I'm not
>> > even sure where to start.
>>   $ svn cat svn://svn.freebsd.org/base/head/sys/dev/acpica/acpi_pcib_acpi.c | wc -l
>>   531
>> No difference here on ICH9, ichwd(4) still doesn't attach.
> Can you add some printfs to see if the new method is being called in
> acpi_pcib_alloc_resource() and if it is failing when it is called?

rman_reserve_resource() fails with SYS_RES_MEMORY for isab0 when ichwd0
tries to attach. And acpi_alloc_sysres() is not called when isab0 or
isa0 are attached.

  isab0: found ICH9 or equivalent chipset: Intel ICH9 watchdog timer
  ichwd0: <Intel ICH9 watchdog timer> on isa0
  isab0: found ICH9 or equivalent chipset: Intel ICH9 watchdog timer
  acpi_alloc_resource::acpi_alloc_sysres(child->nameunit=ichwd0, type=SYS_RES_IOPORT, *rid=0, start=1072, end=1079, count=8, flags=6) res=0xfffffe0007fed380 RF_ACTIVE activated
  pcib0: allocated type 4 (0x430-0x437) for rid 0 of ichwd0
  acpi_alloc_resource::acpi_alloc_sysres(child->nameunit=ichwd0, type=SYS_RES_IOPORT, *rid=1, start=1120, end=1151, count=32, flags=6) res=0xfffffe0007fed400 RF_ACTIVE activated
  pcib0: allocated type 4 (0x460-0x47f) for rid 1 of ichwd0
  acpi_pcib_acpi_alloc_resource::acpi_alloc_sysres(child->nameunit=isab0, type=SYS_RES_MEMORY, *rid=0, start=4275172368, end=4275172371, count=4, flags=6) res=0 failed to reserve
  ichwd0: unable to reserve GCS registers
  device_attach: ichwd0 attach returned 6

Do you need full bootverbose log?

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