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Date: Tue, 14 May 2019 10:49:48 +0200
From: Benjamin Gaignard <benjamin.gaignard@...aro.org>
To: John Stultz <john.stultz@...aro.org>
Cc: lkml <linux-kernel@...r.kernel.org>,
Laura Abbott <labbott@...hat.com>,
Sumit Semwal <sumit.semwal@...aro.org>,
Liam Mark <lmark@...eaurora.org>,
Pratik Patel <pratikp@...eaurora.org>,
Brian Starkey <Brian.Starkey@....com>,
Vincent Donnefort <Vincent.Donnefort@....com>,
Sudipto Paul <Sudipto.Paul@....com>,
"Andrew F . Davis" <afd@...com>,
Xu YiPing <xuyiping@...ilicon.com>,
"Chenfeng (puck)" <puck.chen@...ilicon.com>,
butao <butao@...ilicon.com>,
"Xiaqing (A)" <saberlily.xia@...ilicon.com>,
Yudongbin <yudongbin@...ilicon.com>,
Christoph Hellwig <hch@...radead.org>,
Chenbo Feng <fengc@...gle.com>,
Alistair Strachan <astrachan@...gle.com>,
ML dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [RFC][PATCH 0/5 v4] DMA-BUF Heaps (destaging ION)
Le lun. 13 mai 2019 à 20:37, John Stultz <john.stultz@...aro.org> a écrit :
>
> Here is another RFC of the dma-buf heaps patchset Andrew and I
> have been working on which tries to destage a fair chunk of ION
> functionality.
>
> The patchset implements per-heap devices which can be opened
> directly and then an ioctl is used to allocate a dmabuf from the
> heap.
>
> The interface is similar, but much simpler then IONs, only
> providing an ALLOC ioctl.
>
> Also, I've provided relatively simple system and cma heaps.
>
> I've booted and tested these patches with AOSP on the HiKey960
> using the kernel tree here:
> https://git.linaro.org/people/john.stultz/android-dev.git/log/?h=dev/dma-buf-heap
>
> And the userspace changes here:
> https://android-review.googlesource.com/c/device/linaro/hikey/+/909436
>
> Compared to ION, this patchset is missing the system-contig,
> carveout and chunk heaps, as I don't have a device that uses
> those, so I'm unable to do much useful validation there.
> Additionally we have no upstream users of chunk or carveout,
> and the system-contig has been deprecated in the common/andoid-*
> kernels, so this should be ok.
>
> I've also removed the stats accounting for now, since any such
> accounting should be implemented by dma-buf core or the heaps
> themselves.
>
>
> New in v4:
> * Add fd_flags per Benjamin's request to specify the creation
> flags for the dmabuf fd.
> * Added some optimization in the system heap to allocate
> contiguous pages where possible.
> * Reworked the kselftest code to use vgem rather then
> introducing a dummy importer
> * Other cleanups suggested by Benjamin and Andrew.
>
>
> Outstanding concerns:
> * Need to better understand various secure heap implementations.
> Some concern that heap private flags will be needed, but its
> also possible that dma-buf heaps can't solve everyone's needs,
> in which case, a vendor's secure buffer driver can implement
> their own dma-buf exporter.
> * Making sure the performance issues from potentially
> unnecessary cache-management operations can be resolved
> properly for system and cma heaps(outstanding issue from ION).
>
>
> That said, the main user-interface is shaping up and I wanted
> to get some input on the device model (particularly from GreKH)
> and any other API/ABI specific input.
>
For the whole series:
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>
Thanks,
Benjamin
> thanks
> -john
>
>
> Cc: Laura Abbott <labbott@...hat.com>
> Cc: Benjamin Gaignard <benjamin.gaignard@...aro.org>
> Cc: Sumit Semwal <sumit.semwal@...aro.org>
> Cc: Liam Mark <lmark@...eaurora.org>
> Cc: Pratik Patel <pratikp@...eaurora.org>
> Cc: Brian Starkey <Brian.Starkey@....com>
> Cc: Vincent Donnefort <Vincent.Donnefort@....com>
> Cc: Sudipto Paul <Sudipto.Paul@....com>
> Cc: Andrew F. Davis <afd@...com>
> Cc: Xu YiPing <xuyiping@...ilicon.com>
> Cc: "Chenfeng (puck)" <puck.chen@...ilicon.com>
> Cc: butao <butao@...ilicon.com>
> Cc: "Xiaqing (A)" <saberlily.xia@...ilicon.com>
> Cc: Yudongbin <yudongbin@...ilicon.com>
> Cc: Christoph Hellwig <hch@...radead.org>
> Cc: Chenbo Feng <fengc@...gle.com>
> Cc: Alistair Strachan <astrachan@...gle.com>
> Cc: dri-devel@...ts.freedesktop.org
>
> Andrew F. Davis (1):
> dma-buf: Add dma-buf heaps framework
>
> John Stultz (4):
> dma-buf: heaps: Add heap helpers
> dma-buf: heaps: Add system heap to dmabuf heaps
> dma-buf: heaps: Add CMA heap to dmabuf heaps
> kselftests: Add dma-heap test
>
> MAINTAINERS | 18 ++
> drivers/dma-buf/Kconfig | 10 +
> drivers/dma-buf/Makefile | 2 +
> drivers/dma-buf/dma-heap.c | 241 ++++++++++++++++
> drivers/dma-buf/heaps/Kconfig | 14 +
> drivers/dma-buf/heaps/Makefile | 4 +
> drivers/dma-buf/heaps/cma_heap.c | 169 ++++++++++++
> drivers/dma-buf/heaps/heap-helpers.c | 261 ++++++++++++++++++
> drivers/dma-buf/heaps/heap-helpers.h | 55 ++++
> drivers/dma-buf/heaps/system_heap.c | 162 +++++++++++
> include/linux/dma-heap.h | 59 ++++
> include/uapi/linux/dma-heap.h | 56 ++++
> tools/testing/selftests/dmabuf-heaps/Makefile | 11 +
> .../selftests/dmabuf-heaps/dmabuf-heap.c | 232 ++++++++++++++++
> 14 files changed, 1294 insertions(+)
> create mode 100644 drivers/dma-buf/dma-heap.c
> create mode 100644 drivers/dma-buf/heaps/Kconfig
> create mode 100644 drivers/dma-buf/heaps/Makefile
> create mode 100644 drivers/dma-buf/heaps/cma_heap.c
> create mode 100644 drivers/dma-buf/heaps/heap-helpers.c
> create mode 100644 drivers/dma-buf/heaps/heap-helpers.h
> create mode 100644 drivers/dma-buf/heaps/system_heap.c
> create mode 100644 include/linux/dma-heap.h
> create mode 100644 include/uapi/linux/dma-heap.h
> create mode 100644 tools/testing/selftests/dmabuf-heaps/Makefile
> create mode 100644 tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
>
> --
> 2.17.1
>
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