Am Donnerstag, den 02.02.2017, 11:44 +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@xxxxxxxxxxxxxxxxxx>
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> Cc: "Christian König" <christian.koenig@xxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
> Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> Cc: Christian Gmeiner <christian.gmeiner@xxxxxxxxx>
> Cc: Rob Clark <robdclark@xxxxxxxxx>
> Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
> Cc: Stephen Warren <swarren@xxxxxxxxxxxxx>
> Cc: Alexandre Courbot <gnurou@xxxxxxxxx>
> Cc: Eric Anholt <eric@xxxxxxxxxx>
> Cc: Sinclair Yeh <syeh@xxxxxxxxxx>
> Cc: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
> ---
> 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 | 16 +-
> 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(+), 447 deletions(-)
[...]
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
> index f503af462dad..004456534e48 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
> @@ -107,6 +107,7 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
> struct drm_mm_node *node, size_t size)
> {
> struct etnaviv_vram_mapping *free = NULL;
> + enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW;
> int ret;
>
> lockdep_assert_held(&mmu->lock);
> @@ -117,15 +118,10 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
> struct list_head list;
> bool found;
>
> - /*
> - * XXX: The DRM_MM_SEARCH_BELOW is really a hack to trick
> - * drm_mm into giving out a low IOVA after address space
> - * rollover. This needs a proper fix.
> - */
> ret = drm_mm_insert_node_in_range(&mmu->mm, node,
> - size, 0, mmu->last_iova, ~0UL,
> - mmu->last_iova ? DRM_MM_SEARCH_DEFAULT : DRM_MM_SEARCH_BELOW);
> -
> + size, 0, 0,
> + mmu->last_iova, U64_MAX,
> + mode);
> if (ret != -ENOSPC)
> break;
>
> @@ -140,7 +136,7 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
> }
>
> /* Try to retire some entries */
> - drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0, 0);
> + drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0, mode);
>
> found = 0;
> INIT_LIST_HEAD(&list);
> @@ -192,6 +188,8 @@ static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
> list_del_init(&m->scan_node);
> }
>
> + mode = DRM_MM_INSERT_EVICT;
> +
> /*
> * We removed enough mappings so that the new allocation will
> * succeed. Ensure that the MMU will be flushed before the
This needs a rebase on the etnaviv for 4.11 pull, that removes the hack
mentioned in the comment above. Otherwise the code change looks fine.
Regards,
Lucas
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