For such devices, we require _PRS to exist and we warn if any of the
resources in _PRS are not IRQ resources (since we'll have no way of knowing
which of those resources to use without a working _CRS). When it does
come time to set resources, we build up a resource buffer from scratch
as we do for devices with _CRS that only have IRQ resources.
- Fix a bug with setting extended IRQ resources where we set the IRQ value
in the wrong resource structure meaning that whichever IRQ was listed in
_PRS was used instead. This might fix some weird issues on certain boxes
where IRQs > 16 don't seem to work when using ACPI.
- Fix a bug with how we walked the resource buffer after _SRS to call
config_intr() in that the 'end' variable was not properly updated, so we
could either terminate the loop early or loop after the end of the
buffer.
Tested by: pjd
multiple IRQs (which is nonsense for _CRS) when the link hasn't been
programmed. Before, this was a KASSERT. A ServerWorks system was
seen returning IRQs of 0, 2 in response to _CRS before link setup.
Thanks to sam@ for quick testing and turnaround on this.
Tested by: sam
in the _PRS or _CRS of link devices. If faced with multiple DPFs in a
_PRS, we just use the first one. We assume that if _CRS has DPF tags they
only contain a single set since multiple DPFs wouldn't make any sense. In
practice, the only DPFs I've seen so far for link devices are that the one
IRQ resource is surrounded by a DPF tag pair for no apparent reason, and
this should handle that case fine now.
- Only allocate link structures for IRQ resources for link devices rather
than allocating a link structure for every resource.
Reviewed by: njl
Tested by: phk
@sys/dev/acpica/acpi_pci_link.c:153" panic by backing out rev 1.37 in the SMP
case. It appears that on a dual-proc machine the assertions in the rev 1.37
commit log hold true.
resource lists. It used to be sized based only on _CRS, hence _PRS could
perform an out-of-bounds access if it was larger (i.e., when there are
dependent functions). Add asserts to detect this case. Note, this is
only a temporary fix and I believe _PRS and _CRS should have separate
arrays.
Also, fix a typo where the wrong irq was being check for the APIC case.
Submitted by: tegge
- Use a new-bus device driver for the ACPI PCI link devices. The devices
are called pci_linkX. The driver includes suspend/resume support so that
the ACPI bridge drivers no longer have to poke the links to get them
to handle suspend/resume. Also, the code to handle which IRQs a link is
routed to and choosing an IRQ when a link is not already routed is all
contained in the link driver. The PCI bridge drivers now ask the link
driver which IRQ to use once they determine that a _PRT entry does not
use a hardwired interrupt number.
- The new link driver includes support for multiple IRQ resources per
link device as well as preserving any non-IRQ resources when adjusting
the IRQ that a link is routed to.
- The entire approach to routing when using a link device is now
link-centric rather than pci bus/device/pin specific. Thus, when
using a tunable to override the default IRQ settings, one now uses
a single tunable to route an entire link rather than routing a single
device that uses the link (which has great foot-shooting potential if
the user tries to route the same link to two different IRQs using two
different pci bus/device/pin hints). For example, to adjust the IRQ
that \_SB_.LNKA uses, one would set 'hw.pci.link.LNKA.irq=10' from the
loader.
- As a side effect of having the link driver, unused link devices will now
be disabled when they are probed.
- The algorithm for choosing an IRQ for a link that doesn't already have an
IRQ assigned is now much closer to the one used in $PIR routing. When a
link is routed via an ISA IRQ, only known-good IRQs that the BIOS has
already used are used for routing instead of using probabilities to
guess at which IRQs are probably not used by an ISA device. One change
from $PIR is that the SCI is always considered a viable ISA IRQ, so that
if the BIOS does not setup any IRQs the kernel will degenerate to routing
all interrupts over the SCI. For non ISA IRQs, interrupts are picked
from the possible pool using a simplistic weighting algorithm.
Tested by: ru, scottl, others on acpi@
Reviewed by: njl
should only affect current resources, it seems best to wait until all
configuration is done before disabling it. If this fixes any problems, it
is a MT5 candidate.
* Serialize access to acpi_pci_link_config(), acpi_pci_find_prt(),
acpi_pci_link_route(), and acpi_pci_link_resume().
* Add lock assertions to all functions called by them.
there is no irq link. Since we now use the stored copy of PRT, not the
one that used to be passed into acpi_pcib_route_interrupt(), we need it in
the list. [1]
Fix a bug in acpi_pci_find_prt() where we weren't checking the bus, thus
choosing the wrong PRT entry to use for routing the link. Also, add a
printf for the case where the PRT entry is not found as this should not
happen.
Tested by: marcel [1]
incomplete in that the PRT routing was not aware of link programming.
Fix this by doing all routing through the link devices. The new algorithm
for setting up links is:
1. Read _CRS to get current setting. If invalid (not in _PRS), then set
to 0.
2. Attempt to call _DIS on the link. If successful, mark the link as not
routed. Otherwise, assume it still is.
Then when a routing request occurs:
3. Update weights for all IRQs
4. Attempt to route the initial IRQ if valid
5. If that fails, walk through the sorted list, attempting to route IRQs.
6. Configure the trigger/polarity based on _PRS.
Other changes:
* Add acpi_pci_find_prt() to look up the PRT entry for a given device and
acpi_pci_link_route() to select/route the best IRQ for it.
* Remove duplicated code in acpi_pcib_route_interrupt() that picked the
first IRQ from _PRS.
* Remove unneeded arguments from acpi_pcib_resume() and friends.
* Ignore _STA on link devices but report if it seems strange.
* Add a prt_source handle to the PRT structure since the ACPI struct
ACPI_PCI_ROUTING_TABLE uses a fixed-size entry for it. We'll need to
dynamically size this object if we want to use it the same way ACPI-CA
does. Null-terminate the source.
Tested by: Luo Hong <luohong99_at_mails.tsinghua.edu.cn>,
Jeffrey Katcher <jmkatcher_at_yahoo.com>
Info from: jhb, Len Brown (Intel)
message if they are incorrect. Also, remove the hack of allowing the
initial irq setting to not be in _PRS. As before, the old behavior can be
regained by defining ACPI_OLD_PCI_LINK.
following behavior:
* Link devices return invalid status (_STA) values. The results are very
unreliable -- sometimes never present. Just ignore the status and pick
the best configuration from _PRS.
* Link devices return invalid current settings (_CRS). Even after setting
the link value, many systems still return a different setting for _CRS.
When setting an IRQ, don't bother to check _CRS to see if we succeeded.
Note that we still check _CRS before routing and this should be addressed
as well.
Since this is a sensitive area, leave the old behavior accessible via
uncommenting the define for ACPI_OLD_PCI_LINK at the top of the file. Once
this has been thoroughly tested, this option and the code it covers will
be removed.
Thanks to Len Brown at Intel for informing us of these issues as he worked
around them in Linux.
correct. Instead, check it against the possible settings (_PRS) when
the link is probed. This is important when using APIC mode but link
devices still have PIC mode settings. This is also what Linux does.
Additional prodding by: Len Brown len dot brown at intel dot com
Implement this in acpi_MatchHid() and acpi_isa_get_compatid(). This
should fix mouse support for some users.
Move all users of AcpiGetObjectInfo() to use dynamic storage instead of
a devinfo on the stack. This is necessary since ACPI-CA needs to
allocate different sized arrays for the CompatList.
boot-disabled devices instead of skipping the last interrupt. This is
especially important for devices that only have one interrupt as this
bug was keeping any interrupt from being tried at all.
Reviewed by: msmith
Approved by: re (scottl)
- For acpi_pci_link_entry_dump(), add a few helper functions to display
the trigger mode, polarity, and sharemode of an individual IRQ resource.
These functions are then called for both regular and extended IRQ
resources.
- In acpi_pci_link_set_irq(), use the same type of IRQ resource
(regular vs. extended) for the new current resource as the type of
the resources from _PRS.
- When routing an interrupt don't ignore extended IRQ resources. Also,
use the same type of IRQ resource (regular vs. extended) for the new
current resource when as the type of the resource from _PRS.
Tested by: peter
* Use ACPI_BUFFER as the type for AcpiGetObjectInfo
* Remove AcpiEnableEvent/AcpiClearEvent for ACPI_EVENT_FIXED (power/sleep
buttons) as they are no longer needed
* Change calls to use the new GPE functions
* Add AcpiOs*Lock functions
There were no serious problem reports on this in spite of my concern.
To get debug output from acpi_pci_link, just enable bootverbose flag
in usual manner (boot -v).
Approved by: re
state. Instead, use ACPI_STA_PRESENT and ACPI_STA_FUNCTIONAL for it.
In some ACPI BIOS implementations, boot disabled devices don't have
ACPI_STA_ENABLE bit in _STA object.
Also it is not fatal if getting current IRQ of boot disabled devices
is failed in initial state.
And minor fixes.
