drm/i915: Shift driver's HWSP usage out of reserved range
authorThomas Daniel <thomas.daniel@intel.com>
Wed, 18 Feb 2015 11:48:21 +0000 (11:48 +0000)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Tue, 24 Feb 2015 10:50:32 +0000 (11:50 +0100)
commitb07da53c79ba6480759c1ad352a96b96c7b97c7a
tree78d58987187fded7256d105ca9582acabd0f07c4
parent3e5b6f05a23cc1ba92f429e524d6d5b67401132d
drm/i915: Shift driver's HWSP usage out of reserved range

As of Gen6, the general purpose area of the hardware status page has shrunk and
now begins at dword 0x30.  i915 driver uses dword 0x20 to store the seqno which
is now reserved.  So shift our HWSP dwords up into the general purpose range
before this bites us.

Note that all available documentation just says this is reserved
without going into details about what it's used for.

Signed-off-by: Thomas Daniel <thomas.daniel@intel.com>
Reviewed-by: Dave Gordon <david.s.gordon@intel.com>
[danvet: Add clarification from Thomas that unfortunately Bspec is
silent on what "reserverd" precisely means.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/intel_ringbuffer.h