[PATCH v2 00/18] drm/i915/guc: Refactor ADS access to use iosys_map

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v1: https://patchwork.freedesktop.org/series/99378/
v2: https://patchwork.freedesktop.org/series/99711/

Main from previous version:

	- Rename to iosys-map is already applied
	- Rewrite IOSYS_MAP_INIT_OFFSET() and eliminate most of its
	  users, favoring a offset variable to keep the offset from the
	  original iosys_map.
	- Add map offset to both iosys_map_rd_field() and
	  iosys_map_wr_field()
	- Include documentation with example and expected memory layout
	  for iosys_map_rd_field()
	- Replace

Original cover letter:

While porting i915 to arm64 we noticed some issues accessing lmem.
Some writes were getting corrupted and the final state of the buffer
didn't have exactly what we wrote. This became evident when enabling
GuC submission: depending on the number of engines the ADS struct was
being corrupted and GuC would reject it, refusin to initialize.


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