linux-kernel - [RFC][PATCH 0/4] Support non-default CMA regions to the dmabuf heaps interface

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Message-Id: <20200501073949.120396-1-john.stultz@linaro.org>
Date:   Fri,  1 May 2020 07:39:45 +0000
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        "Andrew F. Davis" <afd@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Pratik Patel <pratikp@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Brian Starkey <Brian.Starkey@....com>,
        Chenbo Feng <fengc@...gle.com>,
        Alistair Strachan <astrachan@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Hridya Valsaraju <hridya@...gle.com>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-mm@...ck.org
Subject: [RFC][PATCH 0/4] Support non-default CMA regions to the dmabuf heaps interface

This is a much belated second stab at allowing non-default CMA
regions to be exposed via the dmabuf heaps interface.

Previous attempt was here:
 https://lore.kernel.org/lkml/20191025225009.50305-2-john.stultz@linaro.org/T/

This pass tried to take Rob's earlier suggestion to use a flag
property.

Feedback would be greatly welcome!

thanks
-john

Cc: Rob Herring <robh+dt@...nel.org>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: "Andrew F. Davis" <afd@...com>
Cc: Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc: Liam Mark <lmark@...eaurora.org>
Cc: Pratik Patel <pratikp@...eaurora.org>
Cc: Laura Abbott <labbott@...hat.com>
Cc: Brian Starkey <Brian.Starkey@....com>
Cc: Chenbo Feng <fengc@...gle.com>
Cc: Alistair Strachan <astrachan@...gle.com>
Cc: Sandeep Patil <sspatil@...gle.com>
Cc: Hridya Valsaraju <hridya@...gle.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: devicetree@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-mm@...ck.org

John Stultz (4):
  devicetree: bindings: Add linux,cma-heap tag for reserved memory
  mm: cma: Add dma_heap flag to cma structure
  dma-buf: cma_heap: Extend logic to export CMA regions tagged with
    "linux,cma-heap"
  example: dts: hi3660-hikey960: Add dts entries to test cma heap
    binding

 .../reserved-memory/reserved-memory.txt        |  3 +++
 .../boot/dts/hisilicon/hi3660-hikey960.dts     |  7 +++++++
 drivers/dma-buf/heaps/cma_heap.c               | 18 +++++++++---------
 include/linux/cma.h                            |  3 +++
 kernel/dma/contiguous.c                        |  3 +++
 mm/cma.c                                       | 11 +++++++++++
 mm/cma.h                                       |  1 +
 7 files changed, 37 insertions(+), 9 deletions(-)

-- 
2.17.1