On 6/24/19 3:49 PM, John Stultz wrote:
Here is another pass at the dma-buf heaps patchset Andrew and I have been working on which tries to destage a fair chunk of ION functionality.
I've gotten bogged down with both work and personal tasks so I haven't had a chance to look too closely but, once again, I'm happy to see this continue to move forward.
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 v6: * Number of cleanups and error path fixes suggested by Brian Starkey, many thanks for his close review and suggestions! 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. So I'm not too worried here.
syzbot found a DoS with Ion which I ACKed a fix for. https://lore.kernel.org/lkml/03763360-a7de-de87-eb90-ba7838143930@xxxxxxxxxxxxxxxxxxx/ This series doesn't have the page pooling so that particular bug may not be applicable but given this is not the first time I've seen Ion used as a DoS mechanism, it would be good to think about putting in some basic checks. Thanks, Laura
Thoughts and feedback would be greatly appreciated! thanks -john Cc: Laura Abbott <labbott@xxxxxxxxxx> Cc: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx> Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx> Cc: Liam Mark <lmark@xxxxxxxxxxxxxx> Cc: Pratik Patel <pratikp@xxxxxxxxxxxxxx> Cc: Brian Starkey <Brian.Starkey@xxxxxxx> Cc: Vincent Donnefort <Vincent.Donnefort@xxxxxxx> Cc: Sudipto Paul <Sudipto.Paul@xxxxxxx> Cc: Andrew F. Davis <afd@xxxxxx> Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx> Cc: Chenbo Feng <fengc@xxxxxxxxxx> Cc: Alistair Strachan <astrachan@xxxxxxxxxx> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx 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 | 249 +++++++++++++++++ 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 | 262 ++++++++++++++++++ drivers/dma-buf/heaps/heap-helpers.h | 54 ++++ drivers/dma-buf/heaps/system_heap.c | 121 ++++++++ include/linux/dma-heap.h | 59 ++++ include/uapi/linux/dma-heap.h | 55 ++++ tools/testing/selftests/dmabuf-heaps/Makefile | 9 + .../selftests/dmabuf-heaps/dmabuf-heap.c | 234 ++++++++++++++++ 14 files changed, 1260 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
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