intel_gpu_frequency: A tool to manipulate Intel GPU frequency

WARNING: very minimally tested

In general you should not need this tool. Its primary purpose is for
benchmarking, and for debugging performance issues.

For many kernel releases now sysfs has supported reading and writing the GPU
frequency. Therefore, this tool provides no new functionality. What it does
provide is an easy to package (for distros) tool that handles the most common
scenarios.

v2:
Get rid of -f from the usage message (Jordan)
Add space before [-s (Jordan)
Add a -c/--custom example (Jordan)
Add a setting for resetting to hardware default (Ken)
Replicate examples in commit message in the source code. (me)

v3:
Its not It's (me)
Add --help/-h to usage
Add Version + man page
Rename tool to intel_gpu_frequency, from intel_frequency
Remove "sudo" from the examples

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Cc: Kenneth Graunke <kenneth@whitecape.org>

Here are some sample usages:
$ intel_gpu_frequency --get=cur,min,max,eff
cur: 200 MHz
min: 200 MHz
RP1: 200 MHz
max: 1200 MHz

$ intel_gpu_frequency -g
cur: 200 MHz
min: 200 MHz
RP1: 200 MHz
max: 1200 MHz

$ intel_gpu_frequency -geff
RP1: 200 MHz

$ intel_gpu_frequency --set min=300
$ intel_gpu_frequency --get min
cur: 300 MHz
min: 300 MHz
RP1: 200 MHz
max: 1200 MHz

$ intel_gpu_frequency --custom max=900
$ intel_gpu_frequency --get max
cur: 300 MHz
min: 300 MHz
RP1: 200 MHz
max: 900 MHz

$ intel_gpu_frequency --max
$ intel_gpu_frequency -g
cur: 1200 MHz
min: 1200 MHz
RP1: 200 MHz
max: 1200 MHz

$ intel_gpu_frequency -e
$ intel_gpu_frequency -g
cur: 200 MHz
min: 200 MHz
RP1: 200 MHz
max: 200 MHz

$ intel_gpu_frequency --max
$ intel_gpu_frequency -g
cur: 1200 MHz
min: 1200 MHz
RP1: 200 MHz
max: 1200 MHz

$ intel_gpu_frequency --min
$ intel_gpu_frequency -g
cur: 200 MHz
min: 200 MHz
RP1: 200 MHz
max: 200 MHz

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