On 2012/01/03 23:12, John Baldwin wrote:
On Wednesday, November 23, 2011 4:09:25 pm kron wrote:
On 2011/11/23 07:57, kron wrote:

I'm bringing this to -acpi@ as suggested by jhb@.

Some time ago while testing 9.0-RC2 I noticed that power management
got broken (powerd doesn't start, Cx states disappeared) on a specific
class of our minirouters. I created kern/162578, bisected the issue
down to r216674 and I contacted the author - jhb@. John was kind to do
a further analysis. Verbose boots before and after r216674 differ this

-Calibrating TSC clock ... TSC clock: 532647138 Hz
+Calibrating TSC clock ... TSC clock: 532648183 Hz

-ACPI timer: 0/4 0/5 0/4 0/5 0/4 0/5 0/4 0/5 0/4 0/4 ->  0
-Timecounter "ACPI-safe" frequency 3579545 Hz quality 850
-acpi_timer0:<24-bit timer at 3.579545MHz>  port 0x4008-0x400b on acpi0
+acpi_timer0: couldn't allocate resource (port 0x4008)

-acpi_throttle0: P_CNT from P_BLK 0x4010
+acpi_throttle0: failed to attach P_CNT
+device_attach: acpi_throttle0 attach returned 6

John's comment:
  >  So this is the issue, and it seems what happens is that your
  >  BIOS assigns the resources for this range to the pcib0 device
  >  when we expect them to be assigned as a system resource (if
  >  at all):

  >  pcib0:<ACPI Host-PCI bridge>  port
  >  0xcf8-0xcff,0x4000-0x407f,0x4080-0x40ff,0x5000-0x500f,0x6000-0x607f
  >  on acpi0

  >  You could try hacking your ASL to not list the 0x4000-0x407f range
  >  for now, but the real fix is probably to make resources attached
  >  to Host-PCI bridge devices be treated as if they were system
  >  resources and put into the ACPI system resource rman instead.
  >  That requires a fair bit of work however.

John also suggested to involve jkim@ and -acpi@.

I'm going to experiment with ASL because it would be an acceptable
solution to me and the real fix is way above my skills ATM.

As promised, I fiddled with ASL. I did found something which
resembled 0x4000-0x407f:
DefinitionBlock ("/tmp/acpidump.aml", "DSDT", 1, "VIA601", "AWRDACPI",
      Scope (\_SB)
          Device (PCI0)
              Method (_CRS, 0, NotSerialized)
                  Name (BUF0, ResourceTemplate ()
                      IO (Decode16,
                          0x4000,             // Range Minimum
                          0x4000,             // Range Maximum
                          0x01,               // Alignment
                          0x80,               // Length
I removed the IO block, compiled, installed the AML, rebooted
and voila - I have my power management back even with r216674.

Big thanks to jhb@ for guiding me.

As always, big thanks to all the good souls who write the
Handbook, too. It helped me with ASL and AML.

1. this hack is good enough for me, and
2. the real fix John suggested is above my skills
I think the PR can be closed.

Can you try an updated HEAD and see if a stock ASL works?

Just tested - the stock ASL fails as before:
acpi0: reservation of 0, a0000 (3) failed
acpi0: reservation of 100000, 1f6f0000 (3) failed
acpi_timer0: couldn't allocate resource (port 0x4008)
acpi_throttle0: <ACPI CPU Throttling> on cpu0
acpi_throttle0: failed to attach P_CNT
device_attach: acpi_throttle0 attach returned 6

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