Probe CPUs after the PCI hierarchy on i386, amd64, and ia64. This allows
the cpufreq drivers to reliably use properties of PCI devices for quirks,
etc.
- For the legacy drivers, add CPU devices via

Probe CPUs after the PCI hierarchy on i386, amd64, and ia64. This allows
the cpufreq drivers to reliably use properties of PCI devices for quirks,
etc.
- For the legacy drivers, add CPU devices via an identify routine in the
CPU driver itself rather than in the legacy driver's attach routine.
- Add CPU devices after Host-PCI bridges in the acpi bus driver.
- Change the ichss(4) driver to use pci_find_bsf() to locate the ICH and
check its device ID rather than having a bogus PCI attachment that only
checked for the ID in probe and always failed. As a side effect, you
can now kldload ichss after boot.
- Fix the ichss(4) driver to use the correct device_t for the ICH (and not
for ichss0) when doing PCI config space operations to enable SpeedStep.

MFC after: 2 weeks
Reviewed by: njl, Andriy Gapon avg of icyb.net.ua

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Since DELAY() was moved, most <machine/clock.h> #includes have been
unnecessary.

Only activate ICH speedstep if we're going to use it. No bugs were observed
due to this but it's cleaner this way.

Make a pass through all drivers checking specs for desired behavior on
SMP systems. It appears all drivers except ichss should attach to each
CPU and that settings should be performed on each CPU.

Make a pass through all drivers checking specs for desired behavior on
SMP systems. It appears all drivers except ichss should attach to each
CPU and that settings should be performed on each CPU. Add comments about
this. Also, add a guard for p4tcc's identify method being called more than
once.

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Support disabling individual cpufreq drivers with hints, e.g.,
hint.ichss.0.disabled="1"

Don't attach ichss if est is present. On systems that seem to support both,
the multi-setting EST is preferable.

Introduce a new method, cpufreq_drv_type(), that returns the type of the
driver. This used to be handled by cpufreq_drv_settings() but it's
useful to get the type/flags separately from getting the s

Introduce a new method, cpufreq_drv_type(), that returns the type of the
driver. This used to be handled by cpufreq_drv_settings() but it's
useful to get the type/flags separately from getting the settings.
(For example, you don't have to pass an array of cf_setting just to find
the driver type.)

Use this new method in our in-tree drivers to detect reliably if acpi_perf
is present and owns the hardware. This simplifies logic in drivers as well
as fixing a bug introduced in my last commit where too many drivers attached.

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Fix the check for acpi_perf(4) so that we verify if it is fully attached
or just offering info. In the former case, we don't probe/attach to allow
the ACPI driver precedence. A refinement of this w

Fix the check for acpi_perf(4) so that we verify if it is fully attached
or just offering info. In the former case, we don't probe/attach to allow
the ACPI driver precedence. A refinement of this would be to actually
use the info provided by acpi_perf(4) to get the real CPU clock rates
instead of estimating them but since all systems that support both
acpi_perf(4) and ichss(4) export the control registers to acpi_perf(4),
it can just handle the registers on its own.

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Use intr_disable/restore() instead of disable_intr() since the latter is
not MI. This should fix build on non i386 platforms.

Don't rely on indirect inclusion of machine/bus.h to use
bus_space_{read,write}_* routines. This doesn't matter in the current
tree, but will matter soon (the rest of the tree appears to already be

Don't rely on indirect inclusion of machine/bus.h to use
bus_space_{read,write}_* routines. This doesn't matter in the current
tree, but will matter soon (the rest of the tree appears to already be
clean).

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Add a cpufreq driver for the SpeedStep capability in the ICH chipset. This
driver offers two settings. Information for this driver was obtained from
the Intel datasheets and by reviewing the Linux

Add a cpufreq driver for the SpeedStep capability in the ICH chipset. This
driver offers two settings. Information for this driver was obtained from
the Intel datasheets and by reviewing the Linux driver.

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