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In the near future, we will want to start a GPU error capture from a new context, from inside the softirq region of a forced preemption. To do so requires us to break up the monolithic error capture to provide new entry points with finer control; in particular focusing on one engine/gt, and being able to compose an error state from little pieces of HW capture. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Andi Shyti <andi.shyti@intel.com> Acked-by: Andi Shyti <andi.shyti@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200110123059.1348712-1-chris@chris-wilson.co.uk