For gen9 we enable cmdparsing on the BCS ring, specifically
to catch inadvertent accesses to sensitive registers

Unlike gen7/hsw, we use the parser only to block certain
registers. We can rely on h/w to block restricted commands,
so the command tables only provide enough info to allow the
parser to delineate each command, and identify commands that
access registers.

Note: This patch deliberately ignores checkpatch issues in
favour of matching the style of the surrounding code. We'll
correct the entire file in one go in a later patch.
Signed-off-by: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>

CVE-2019-0155

[tjaalton: backport to i915_bpo
 - intel_engine_cs struct members, variables got renamed s/ring/engine/,
   follow the same renaming here.
 - i915_cmd_parser_init_ring has changed since 4.4, so add gen9_blt_reg_tables
   and use it as on the patch for 4.15.
 - Use type safe register definitions.]
Signed-off-by: Timo Aaltonen <timo.aaltonen@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>