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Which revisions to use for the Intel and AMD DSMs is unclear. For the
Intel one, the written specification indicates only 0, but Linux uses
1 (possibly an oversight). For the AMD one, for which there is no
specification, Linux uses 0, but at least on the Framework 13 AMD 7040
series, the "enumerate functions" function only returns a mask that
covers all the functions we expect when called with revision 2.
Introduce an auto-detection strategy where each revision starting from
0 is tried in turn up to some limit (included; default: 15). As soon as
a revision implements all expected functions, we stop the loop and use
that one, in effect selecting the minimum revision that implements all
we need, which should avoid potential backwards-compatibility problems.
If no revision implements all expected functions, the highest available
revision in the checked range is selected, but higher revisions that do
not bring new functions are discarded (see the explanatory comment in
acpi_spmc_probe_dsm()).
The revision policy is still tunable using the same existing sysctl(8)
knobs 'debug.acpi.spmc.intel_dsm_revision' and
'debug.acpi.spmc.amd_dsm_revision'. They have been extended so that
a negative value indicates to use the auto-detection mechanism up to
a revision of minus the value. As before, a 0 or positive value
requests a specific revision. A new knob is introduced for the
Microsoft DSM just in case ('debug.acpi.spmc.ms_dsm_revision').
Since now the revision can be auto-detected, and thus depends on
a particular device instance, move it into 'struct dsm_info' on the
softc. This also enables finishing the split between static and
dynamic/tunable information, allowing to constify all the DSM
descriptors.
Print the revision eventually used along with the supported functions.
Tested on an Intel Framework laptop.
Reviewed by: obiwac
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D56882
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