linux-kernel - [PATCH v7 0/5] dma-buf: Code rework and performance improvements for system heap

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Message-Id: <20201121235002.69945-1-john.stultz@linaro.org>
Date:   Sat, 21 Nov 2020 23:49:57 +0000
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Laura Abbott <labbott@...nel.org>,
        Brian Starkey <Brian.Starkey@....com>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Daniel Mentz <danielmentz@...gle.com>,
        Chris Goldsworthy <cgoldswo@...eaurora.org>,
        Ørjan Eide <orjan.eide@....com>,
        Robin Murphy <robin.murphy@....com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Simon Ser <contact@...rsion.fr>,
        James Jones <jajones@...dia.com>, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH v7 0/5] dma-buf: Code rework and performance improvements for system heap

Hey All,
  So Sumit noted a flub I made in adapting the last series to
the new dma-buf-map code that is in drm-misc-next. Thus I wanted
to send this (hopefully) last revision of my patch series of
performance optimizations to the dma-buf system heap, once again
against drm-misc-next.

This series reworks the system heap to use sgtables, and then
consolidates the pagelist method from the heap-helpers into the
CMA heap. After which the heap-helpers logic is removed (as it
is unused). I'd still like to find a better way to avoid some of
the logic duplication in implementing the entire dma_buf_ops
handlers per heap. But unfortunately that code is tied somewhat
to how the buffer's memory is tracked. As more heaps show up I
think we'll have a better idea how to best share code, so for
now I think this is ok.

After this, the series introduces an optimization that
Ørjan Eide implemented for ION that avoids calling sync on
attachments that don't have a mapping.

Finally, an optimization to use larger order pages for the system
heap. This change brings us closer to the current performance
of the ION allocation code (though there still is a gap due
to ION using a mix of deferred-freeing and page pools, I'll be
looking at integrating those eventually).

This version of the series does not include the system-uncached
heap as Daniel wanted further demonstration that it is useful
with devices that use the mesa stack. I'm working on such a
justification but I don't want to hold up these rework patches
in the meantime.

thanks
-john

New in v7:
* Fixed the incorrect adaptation to the dma-buf-map usage

Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: Liam Mark <lmark@...eaurora.org>
Cc: Laura Abbott <labbott@...nel.org>
Cc: Brian Starkey <Brian.Starkey@....com>
Cc: Hridya Valsaraju <hridya@...gle.com>
Cc: Suren Baghdasaryan <surenb@...gle.com>
Cc: Sandeep Patil <sspatil@...gle.com>
Cc: Daniel Mentz <danielmentz@...gle.com>
Cc: Chris Goldsworthy <cgoldswo@...eaurora.org>
Cc: Ørjan Eide <orjan.eide@....com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Ezequiel Garcia <ezequiel@...labora.com>
Cc: Simon Ser <contact@...rsion.fr>
Cc: James Jones <jajones@...dia.com>
Cc: linux-media@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org

John Stultz (5):
  dma-buf: system_heap: Rework system heap to use sgtables instead of
    pagelists
  dma-buf: heaps: Move heap-helper logic into the cma_heap
    implementation
  dma-buf: heaps: Remove heap-helpers code
  dma-buf: heaps: Skip sync if not mapped
  dma-buf: system_heap: Allocate higher order pages if available

 drivers/dma-buf/heaps/Makefile       |   1 -
 drivers/dma-buf/heaps/cma_heap.c     | 329 +++++++++++++++++----
 drivers/dma-buf/heaps/heap-helpers.c | 274 ------------------
 drivers/dma-buf/heaps/heap-helpers.h |  53 ----
 drivers/dma-buf/heaps/system_heap.c  | 414 ++++++++++++++++++++++++---
 5 files changed, 647 insertions(+), 424 deletions(-)
 delete mode 100644 drivers/dma-buf/heaps/heap-helpers.c
 delete mode 100644 drivers/dma-buf/heaps/heap-helpers.h

-- 
2.17.1