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    Subject[RFC][PATCH v6 0/7] Generic page pool & deferred freeing for system dmabuf heap
    Date
    This series is starting to get long, so I figured I'd add a
    short cover letter for context.

    The point of this series is trying to add both deferred-freeing
    logic as well as a page pool to the DMA-BUF system heap.

    This is desired, as the combination of deferred freeing along
    with the page pool allows us to offload page-zeroing out of
    the allocation hot path. This was done originally with ION
    and this patch series allows the DMA-BUF system heap to match
    ION's system heap allocation performance in a simple
    microbenchmark [1] (ION re-added to the kernel for comparision,
    running on an x86 vm image):

    ./dmabuf-heap-bench -i 0 1 system
    Testing dmabuf system vs ion heaptype 0 (flags: 0x1)
    ---------------------------------------------
    dmabuf heap: alloc 4096 bytes 5000 times in 86572223 ns 17314 ns/call
    ion heap: alloc 4096 bytes 5000 times in 97442526 ns 19488 ns/call
    dmabuf heap: alloc 1048576 bytes 5000 times in 196635057 ns 39327 ns/call
    ion heap: alloc 1048576 bytes 5000 times in 357323629 ns 71464 ns/call
    dmabuf heap: alloc 8388608 bytes 5000 times in 3165445534 ns 633089 ns/call
    ion heap: alloc 8388608 bytes 5000 times in 3699591271 ns 739918 ns/call
    dmabuf heap: alloc 33554432 bytes 5000 times in 13327402517 ns 2665480 ns/call
    ion heap: alloc 33554432 bytes 5000 times in 15292352796 ns 3058470 ns/call

    Daniel didn't like earlier attempts to re-use the network
    page-pool code to achieve this, and suggested the ttm_pool be
    used instead. This required pulling the fairly tightly knit
    ttm_pool logic apart, but after many failed attmempts I think
    I found a workable abstraction to split out shared logic.

    So this series contains a new generic drm_page_pool helper
    library, converts the ttm_pool to use it, and then adds the
    dmabuf deferred freeing and adds support to the dmabuf system
    heap to use both deferred freeing and the new drm_page_pool.

    Input would be greatly appreciated. Testing as well, as I don't
    have any development hardware that utilizes the ttm pool.

    thanks
    -john

    [1] https://android.googlesource.com/platform/system/memory/libdmabufheap/+/refs/heads/master/tests/dmabuf_heap_bench.c

    Cc: Daniel Vetter <daniel@ffwll.ch>
    Cc: Christian Koenig <christian.koenig@amd.com>
    Cc: Sumit Semwal <sumit.semwal@linaro.org>
    Cc: Liam Mark <lmark@codeaurora.org>
    Cc: Chris Goldsworthy <cgoldswo@codeaurora.org>
    Cc: Laura Abbott <labbott@kernel.org>
    Cc: Brian Starkey <Brian.Starkey@arm.com>
    Cc: Hridya Valsaraju <hridya@google.com>
    Cc: Suren Baghdasaryan <surenb@google.com>
    Cc: Sandeep Patil <sspatil@google.com>
    Cc: Daniel Mentz <danielmentz@google.com>
    Cc: Ørjan Eide <orjan.eide@arm.com>
    Cc: Robin Murphy <robin.murphy@arm.com>
    Cc: Ezequiel Garcia <ezequiel@collabora.com>
    Cc: Simon Ser <contact@emersion.fr>
    Cc: James Jones <jajones@nvidia.com>
    Cc: linux-media@vger.kernel.org
    Cc: dri-devel@lists.freedesktop.org

    John Stultz (7):
    drm: Add a sharable drm page-pool implementation
    drm: ttm_pool: Rename the ttm_pool_dma structure to ttm_pool_page_dat
    drm: ttm_pool: Rework ttm_pool_free_page to allow us to use it as a
    function pointer
    drm: ttm_pool: Rework ttm_pool to use drm_page_pool
    dma-buf: heaps: Add deferred-free-helper library code
    dma-buf: system_heap: Add drm pagepool support to system heap
    dma-buf: system_heap: Add deferred freeing to the system heap

    drivers/dma-buf/heaps/Kconfig | 5 +
    drivers/dma-buf/heaps/Makefile | 1 +
    drivers/dma-buf/heaps/deferred-free-helper.c | 145 ++++++++++
    drivers/dma-buf/heaps/deferred-free-helper.h | 55 ++++
    drivers/dma-buf/heaps/system_heap.c | 77 ++++-
    drivers/gpu/drm/Kconfig | 5 +
    drivers/gpu/drm/Makefile | 1 +
    drivers/gpu/drm/page_pool.c | 220 +++++++++++++++
    drivers/gpu/drm/ttm/ttm_pool.c | 278 ++++++-------------
    include/drm/page_pool.h | 54 ++++
    include/drm/ttm/ttm_pool.h | 23 +-
    11 files changed, 639 insertions(+), 225 deletions(-)
    create mode 100644 drivers/dma-buf/heaps/deferred-free-helper.c
    create mode 100644 drivers/dma-buf/heaps/deferred-free-helper.h
    create mode 100644 drivers/gpu/drm/page_pool.c
    create mode 100644 include/drm/page_pool.h

    --
    2.25.1

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