Re: [PATCH v5] drm: Improve drm_mm search (and fix topdown allocation) with rbtrees

[Lucas Stach <l.stach@pengutronix.de>]

Am Donnerstag, den 02.02.2017, 21:04 +0000 schrieb Chris Wilson:
> The drm_mm range manager claimed to support top-down insertion, but it
> was neither searching for the top-most hole that could fit the
> allocation request nor fitting the request to the hole correctly.
> 
> In order to search the range efficiently, we create a secondary index
> for the holes using either their size or their address. This index
> allows us to find the smallest hole or the hole at the bottom or top of
> the range efficiently, whilst keeping the hole stack to rapidly service
> evictions.
> 
> v2: Search for holes both high and low. Rename flags to mode.
> v3: Discover rb_entry_safe() and use it!
> v4: Kerneldoc for enum drm_mm_insert_mode.
> 
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: "Christian König" <christian.koenig@amd.com>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Russell King <rmk+kernel@armlinux.org.uk>
> Cc: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Sean Paul <seanpaul@chromium.org>
> Cc: Lucas Stach <l.stach@pengutronix.de>
> Cc: Christian Gmeiner <christian.gmeiner@gmail.com>
> Cc: Rob Clark <robdclark@gmail.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Cc: Stephen Warren <swarren@wwwdotorg.org>
> Cc: Alexandre Courbot <gnurou@gmail.com>
> Cc: Eric Anholt <eric@anholt.net>
> Cc: Sinclair Yeh <syeh@vmware.com>
> Cc: Thomas Hellstrom <thellstrom@vmware.com>
> Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
> Reviewed-by: Sinclair Yeh <syeh@vmware.com> # vmwgfx

I can't really comment on the other parts of this patch (way too much
code that I'm only vaguely familiar with), but the etnaviv part of the
change looks fine.

Reviewed-by: Lucas Stach <l.stach@pengutronix.de> #etnaviv
> ---
> 
> v5: Rebase onto etnaviv pull for 4.11 -- no intentional changes from v4.
> 
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c  |  16 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c |  20 +-
>  drivers/gpu/drm/armada/armada_gem.c          |   4 +-
>  drivers/gpu/drm/drm_mm.c                     | 488 +++++++++++++++------------
>  drivers/gpu/drm/drm_vma_manager.c            |   3 +-
>  drivers/gpu/drm/etnaviv/etnaviv_mmu.c        |  11 +-
>  drivers/gpu/drm/i915/i915_gem.c              |  10 +-
>  drivers/gpu/drm/i915/i915_gem_evict.c        |   9 +-
>  drivers/gpu/drm/i915/i915_gem_execbuffer.c   |   5 +-
>  drivers/gpu/drm/i915/i915_gem_gtt.c          |  39 +--
>  drivers/gpu/drm/i915/i915_gem_stolen.c       |   6 +-
>  drivers/gpu/drm/msm/msm_gem.c                |   3 +-
>  drivers/gpu/drm/msm/msm_gem_vma.c            |   3 +-
>  drivers/gpu/drm/selftests/test-drm_mm.c      |  58 ++--
>  drivers/gpu/drm/sis/sis_mm.c                 |   6 +-
>  drivers/gpu/drm/tegra/gem.c                  |   4 +-
>  drivers/gpu/drm/ttm/ttm_bo_manager.c         |  18 +-
>  drivers/gpu/drm/vc4/vc4_crtc.c               |   2 +-
>  drivers/gpu/drm/vc4/vc4_hvs.c                |   3 +-
>  drivers/gpu/drm/vc4/vc4_plane.c              |   6 +-
>  drivers/gpu/drm/via/via_mm.c                 |   4 +-
>  drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c       |  10 +-
>  include/drm/drm_mm.h                         | 184 +++++-----
>  23 files changed, 470 insertions(+), 442 deletions(-)
[...]

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