[Intel-gfx] Error recovery patches (finally)

[Ben Gamari]

Well, after a several month long hiatus, the error recovery patches are finally
back under active development. In fact, it seems they might finally be ready to
merge. After finding a few blatant errors with my reimplementation of oga's
device reset procedure, I can run gem_bad_batch and gem_hang all day long
without a single permanent hang.

There really isn't a whole lot to say about these patches other than they now
work. The patchset's structure is identical to previous versions and implements
everything implemented earlier, except now it all works. Hopefully this is in
time for 2.6.32 as it should be a pretty safe candidate for merge. Thanks to
jbarnes, ickle, and oga for the guidance in putting this together.

Let me know what you think.

Thanks,
- Ben