[PATCH 0/5] drm/v3d: Enable Super Pages

[Maíra Canal]

This series introduces support for super pages in V3D. The V3D MMU has support
for 1MB pages, called super pages, which is currently not used. Therefore,
this patchset has the intention to enable super pages in V3D. The advantage of
enabling super pages size is that if any entry for a page within a super page
is cached in the MMU, it will be used for translation of all virtual addresses
in the range of that super pages without requiring fetching any other entries.

Super pages essentially means a slightly better performance for users,
especially in applications with high memory requirements (e.g. applications
that uses multiple large BOs).

Using a Raspberry Pi 4 (with a PAGE_SIZE=4KB downstream kernel), when running
traces from multiple applications, we were able to see the following
improvements:

fps_avg  helped:  warzone2100.70secs.1024x768.trace:                       1.81 -> 2.56 (41.82%)
fps_avg  helped:  warzone2100.30secs.1024x768.trace:                       2.00 -> 2.39 (19.62%)
fps_avg  helped:  quake2-gl1.4-1280x720.trace:                             35.01 -> 36.57 (4.47%)
fps_avg  helped:  supertuxkart-menus_1024x768.trace:                       120.75 -> 125.50 (3.93%)
fps_avg  helped:  quake2-gles3-1280x720.trace:                             62.69 -> 64.29 (2.55%)
fps_avg  helped:  ue4_shooter_game_shooting_low_quality_640x480.gfxr:      26.13 -> 26.75 (2.39%)
fps_avg  helped:  vkQuake_capture_frames_1_through_1200_1280x720.gfxr:     60.35 -> 61.36 (1.67%)
fps_avg  helped:  ue4_sun_temple_640x480.gfxr:                             24.60 -> 24.94 (1.40%)
fps_avg  helped:  ue4_shooter_game_shooting_high_quality_640x480.gfxr:     23.07 -> 23.34 (1.15%)
fps_avg  helped:  serious_sam_trace02_1280x720.gfxr:                       47.44 -> 47.74 (0.63%)
fps_avg  helped:  ue4_shooter_game_high_quality_640x480.gfxr:              18.91 -> 19.02 (0.59%)

Using a Raspberry Pi 5 (with a PAGE_SIZE=16KB downstream kernel), when running
traces from multiple applications, we were able to see the following
improvements:

fps_avg  helped:  warzone2100.30secs.1024x768.trace:                       3.60 -> 4.49 (24.72%)
fps_avg  helped:  sponza_demo02_800x600.gfxr:                              46.33 -> 49.34 (6.49%)
fps_avg  helped:  quake3e_capture_frames_1_through_1800_1920x1080.gfxr:    155.70 -> 165.71 (6.43%)
fps_avg  helped:  gl-117-1024x768.trace:                                   31.82 -> 33.85 (6.41%)
fps_avg  helped:  supertuxkart-menus_1024x768.trace:                       287.80 -> 303.80 (5.56%)
fps_avg  helped:  ue4_shooter_game_shooting_low_quality_640x480.gfxr:      45.27 -> 47.30 (4.49%)
fps_avg  helped:  sponza_demo01_800x600.gfxr:                              42.05 -> 43.68 (3.89%)
fps_avg  helped:  supertuxkart-racing_1024x768.trace:                      19.94 -> 20.59 (3.26%)
fps_avg  helped:  vkQuake_capture_frames_1_through_1200_1280x720.gfxr:     135.19 -> 139.45 (3.15%)
fps_avg  helped:  quake2-gles3-1280x720.trace:                             151.71 -> 156.13 (2.92%)
fps_avg  helped:  ue4_shooter_game_high_quality_640x480.gfxr:              30.28 -> 31.05 (2.54%)
fps_avg  helped:  rbdoom-3-bfg_640x480.gfxr:                               31.52 -> 32.30 (2.49%)
fps_avg  helped:  quake3e_capture_frames_1800_through_2400_1920x1080.gfxr: 157.29 -> 160.35 (1.94%)
fps_avg  helped:  quake3e-1280x720.trace:                                  230.48 -> 234.51 (1.75%)
fps_avg  helped:  ue4_shooter_game_shooting_high_quality_640x480.gfxr:     49.67 -> 50.46 (1.60%)
fps_avg  helped:  ue4_sun_temple_640x480.gfxr:                             39.70 -> 40.23 (1.34%)

This series also introduces changes in the GEM helpers, in order to enable V3D
to have a separated mountpoint for shmem GEM objects. Any feedback from the
community about the changes in the GEM helpers is welcomed!

Best Regards,
- Maíra

Maíra Canal (5):
  drm/v3d: Fix return if scheduler initialization fails
  drm/gem: Add a mountpoint parameter to drm_gem_object_init()
  drm/v3d: Introduce gemfs
  drm/gem: Create shmem GEM object in a given mountpoint
  drm/v3d: Enable super pages

 drivers/gpu/drm/armada/armada_gem.c           |  2 +-
 drivers/gpu/drm/drm_gem.c                     | 12 ++++-
 drivers/gpu/drm/drm_gem_dma_helper.c          |  2 +-
 drivers/gpu/drm/drm_gem_shmem_helper.c        | 30 +++++++++--
 drivers/gpu/drm/drm_gem_vram_helper.c         |  2 +-
 drivers/gpu/drm/etnaviv/etnaviv_gem.c         |  2 +-
 drivers/gpu/drm/exynos/exynos_drm_gem.c       |  2 +-
 drivers/gpu/drm/gma500/gem.c                  |  2 +-
 drivers/gpu/drm/loongson/lsdc_ttm.c           |  2 +-
 drivers/gpu/drm/mediatek/mtk_drm_gem.c        |  2 +-
 drivers/gpu/drm/msm/msm_gem.c                 |  2 +-
 drivers/gpu/drm/nouveau/nouveau_gem.c         |  2 +-
 drivers/gpu/drm/nouveau/nouveau_prime.c       |  2 +-
 drivers/gpu/drm/omapdrm/omap_gem.c            |  2 +-
 drivers/gpu/drm/qxl/qxl_object.c              |  2 +-
 drivers/gpu/drm/rockchip/rockchip_drm_gem.c   |  2 +-
 drivers/gpu/drm/tegra/gem.c                   |  2 +-
 drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c |  2 +-
 drivers/gpu/drm/v3d/Makefile                  |  3 +-
 drivers/gpu/drm/v3d/v3d_bo.c                  | 19 ++++++-
 drivers/gpu/drm/v3d/v3d_drv.c                 |  7 +++
 drivers/gpu/drm/v3d/v3d_drv.h                 | 15 +++++-
 drivers/gpu/drm/v3d/v3d_gem.c                 |  6 ++-
 drivers/gpu/drm/v3d/v3d_gemfs.c               | 52 +++++++++++++++++++
 drivers/gpu/drm/v3d/v3d_mmu.c                 | 24 ++++++++-
 drivers/gpu/drm/xen/xen_drm_front_gem.c       |  2 +-
 include/drm/drm_gem.h                         |  3 +-
 include/drm/drm_gem_shmem_helper.h            |  3 ++
 28 files changed, 176 insertions(+), 32 deletions(-)
 create mode 100644 drivers/gpu/drm/v3d/v3d_gemfs.c

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2.43.0