acpi_wmi noisy without EC

[Yuri Pankov]

On Tue, Nov 17, 2020, at 11:07 AM, Vladimir Kondratyev wrote:
> On 2020-11-17 10:57, Vladimir Kondratyev wrote:
> > On 2020-11-17 03:00, Yuri Pankov wrote:
> >> I have started seeing the following on boot since some time:
> >> 
> >> acpi_wmi0: <ACPI-WMI mapping> on acpi0
> >> acpi_wmi0: cannot find EC device
> >> device_attach: acpi_wmi0 attach returned 6
> >> acpi_wmi0: <ACPI-WMI mapping> on acpi0
> >> acpi_wmi0: cannot find EC device
> >> device_attach: acpi_wmi0 attach returned 6
> >> acpi_wmi0: <ACPI-WMI mapping> on acpi0
> >> acpi_wmi0: cannot find EC device
> >> device_attach: acpi_wmi0 attach returned 6
> >> acpi_wmi0: <ACPI-WMI mapping> on acpi0
> >> acpi_wmi0: cannot find EC device
> >> device_attach: acpi_wmi0 attach returned 6
> >> 
> >> Likely following this commit:
> >> 
> >> commit 708d048ccfdacf6199cc08a56aa05a9c899441fd
> >> Author: Vladimir Kondratyev <wulf at FreeBSD.org>
> >> Date:   Sat Oct 31 22:19:39 2020 +0000
> >> 
> >>     acpi_wmi(4): Add ACPI_PNP_INFO
> >> 
> >> While the reason is obvious -- there's no EC in this system (Gigabyte
> >> X299X AORUS MASTER desktop motherboard), at least searching the
> >> `acpidump -dt` output doesn't show any PNP0C09 entries -- it certainly
> >> looks like "something is broken" when first noticed.  I wonder if we
> >> could/should handle this gracefully -- no EC, do nothing, simply exit?
> > 
> > Following patch should ignore missing EC like Linux does. Could you 
> > test it?
> > 
> > diff --git a/sys/dev/acpi_support/acpi_wmi.c 
> > b/sys/dev/acpi_support/acpi_wmi.c
> > index 379cfd1705f1..efae96cdcc9a 100644
> > --- a/sys/dev/acpi_support/acpi_wmi.c
> > +++ b/sys/dev/acpi_support/acpi_wmi.c
> > @@ -246,7 +246,7 @@ acpi_wmi_attach(device_t dev)
> >  if ((sc->ec_dev = devclass_get_device(devclass_find("acpi_ec"), 0))
> >      == NULL)
> >  device_printf(dev, "cannot find EC device\n");
> > - else if (ACPI_FAILURE((status = 
> > AcpiInstallNotifyHandler(sc->wmi_handle,
> > + if (ACPI_FAILURE((status = AcpiInstallNotifyHandler(sc->wmi_handle,
> >      ACPI_DEVICE_NOTIFY, acpi_wmi_notify_handler, sc))))
> >  device_printf(sc->wmi_dev, "couldn't install notify handler - %s\n",
> >      AcpiFormatException(status));
> > @@ -701,6 +701,8 @@ acpi_wmi_ec_handler(UINT32 function,
> > ACPI_PHYSICAL_ADDRESS address,
> >  return (AE_BAD_PARAMETER);
> >  if (address + (width / 8) - 1 > 0xFF)
> >  return (AE_BAD_ADDRESS);
> > + if (sc->ec_dev == NULL)
> > + return (AE_NOT_FOUND);
> >  if (function == ACPI_READ)
> >  *value = 0;
> >  ec_addr = address;
> 
> @#@##! Web client ate all the tabs.
> 
> Patch is in attachment.

Output changed, though it's still somewhat noisy -- I guess there isn't a way to NOT report the device that we are not going to attach to, or do that e.g. only for verbose boot?

acpi_wmi0: <ACPI-WMI mapping> on acpi0
acpi_wmi0: cannot find EC device
acpi_wmi0: Embedded MOF found
ACPI: \134GSA1.WQCC: 1 arguments were passed to a non-method ACPI object (Buffer) (20201113/nsarguments-361)
acpi_wmi1: <ACPI-WMI mapping> on acpi0
acpi_wmi1: cannot find EC device
acpi_wmi2: <ACPI-WMI mapping> on acpi0
acpi_wmi2: cannot find EC device
acpi_wmi3: <ACPI-WMI mapping> on acpi0
acpi_wmi3: cannot find EC device