[Intel-gfx] [PATCH 0/4] Device id consolidation

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Series removes device id checks from i915_drv.h macros and consolidates them to
i915_pciids.h as the main "database", while making intel_device_info.c reference
the former, expanding the existing concept of a platform mask by a few low bits
reserved for sub-platform mask.

This has a two-fold positive effect of firstly consolidating the list of device
ids to one location, and secondly removing the if-ladders from every
IS_<platfrom>_<subplatform> call site.

Maintenance burden is not completely removed but should be improved. One case in
point is that I have found some disagreements between device id listed in
i915_pciids.h and i915_drv.h.

At the same time platform mask code is generalized to an array of u32 to
accomodate the addition of EHL and avoid spilling into u64 which would cause a
small code size increase. Downside is that any platforms on the u32 boundary,
like currently ICL and EHL, lose the benefit of optimizing the "IS_ICELAKE ||
IS_ELKHARTLAKE" checks into a single conditional, although at the moment there
aren't any such call-sites.

Before vs after for the whole series:

   text    data     bss     dec     hex filename
1891093   43903    7424 1942420  1da394 i915.ko.0
1890434   43903    7424 1941761  1da101 i915.ko.1

add/remove: 12/3 grow/shrink: 92/121 up/down: 1974/-1769 (205)
...
Total: Before=1286293, After=1286498, chg +0.02%

Tvrtko Ursulin (4):
  drm/i915: Split Pineview device info into desktop and mobile
  drm/i915: Remove redundant device id from IS_IRONLAKE_M macro
  drm/i915: Split some PCI ids into separate groups
  drm/i915: Introduce concept of a sub-platform

 arch/x86/kernel/early-quirks.c           |   3 +-
 drivers/gpu/drm/i915/i915_drv.c          |   8 +-
 drivers/gpu/drm/i915/i915_drv.h          | 133 +++++++++++------
 drivers/gpu/drm/i915/i915_gpu_error.c    |   3 +
 drivers/gpu/drm/i915/i915_pci.c          |  14 +-
 drivers/gpu/drm/i915/intel_device_info.c | 145 ++++++++++++++++++
 drivers/gpu/drm/i915/intel_device_info.h |  27 +++-
 drivers/gpu/drm/i915/intel_pm.c          |   4 +-
 include/drm/i915_pciids.h                | 179 ++++++++++++++++-------
 9 files changed, 414 insertions(+), 102 deletions(-)

-- 
2.19.1