[Bug 93847] GuC is calling a sleeping function in atomic context

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93847

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
So things to note here: Using a single page for a workqueue (256 entries) is
still more than the number of requests we can fit into a ringbuffer and so does
not become the ratelimiting factor on submission, i.e. we can more to a single
page and a persistent kmap and speed things up with simpler code.

There are quite a few ABI issues (returning incorrect timeouts to userspace
etc) and ignored error propagation leading to silly bugs in GuC submission, and
many dubious decisions like atomic64_cmpxchg!

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