Hi,
There's been some recent discussions[1] about Ion-like frameworks. There's apparently interest in just keeping Ion since it works reasonablly well. This series does what should be the final clean ups for it to possibly be moved out of staging.
This includes the following: - Some general clean up and removal of features that never got a lot of use as far as I can tell. - Fixing up the caching. This is the series I proposed back in December[2] but never heard any feedback on. It will certainly break existing applications that rely on the implicit caching. I'd rather make an effort to move to a model that isn't going directly against the establishement though. - Fixing up the platform support. The devicetree approach was never well recieved by DT maintainers. The proposal here is to think of Ion less as specifying requirements and more of a framework for exposing memory to userspace. - CMA allocations now happen without the need of a dummy device structure. This fixes a bunch of the reasons why I attempted to add devicetree support before.
I've had problems getting feedback in the past so if I don't hear any major objections I'm going to send out with the RFC dropped to be picked up. The only reason there isn't a patch to come out of staging is to discuss any other changes to the ABI people might want. Once this comes out of staging, I really don't want to mess with the ABI.
Feedback appreciated.
Thanks, Laura
[1] https://marc.info/?l=linux-kernel&m=148699712602105&w=2 [2] https://marc.info/?l=linaro-mm-sig&m=148176050802908&w=2
Laura Abbott (12): staging: android: ion: Remove dmap_cnt staging: android: ion: Remove alignment from allocation field staging: android: ion: Duplicate sg_table staging: android: ion: Call dma_map_sg for syncing and mapping staging: android: ion: Remove page faulting support staging: android: ion: Remove crufty cache support staging: android: ion: Remove old platform support cma: Store a name in the cma structure cma: Introduce cma_for_each_area staging: android: ion: Use CMA APIs directly staging: android: ion: Make Ion heaps selectable staging; android: ion: Enumerate all available heaps
drivers/base/dma-contiguous.c | 5 +- drivers/staging/android/ion/Kconfig | 51 ++-- drivers/staging/android/ion/Makefile | 14 +- drivers/staging/android/ion/hisilicon/Kconfig | 5 - drivers/staging/android/ion/hisilicon/Makefile | 1 - drivers/staging/android/ion/hisilicon/hi6220_ion.c | 113 --------- drivers/staging/android/ion/ion-ioctl.c | 6 - drivers/staging/android/ion/ion.c | 282 ++++++--------------- drivers/staging/android/ion/ion.h | 5 +- drivers/staging/android/ion/ion_carveout_heap.c | 16 +- drivers/staging/android/ion/ion_chunk_heap.c | 15 +- drivers/staging/android/ion/ion_cma_heap.c | 102 ++------ drivers/staging/android/ion/ion_dummy_driver.c | 156 ------------ drivers/staging/android/ion/ion_enumerate.c | 89 +++++++ drivers/staging/android/ion/ion_of.c | 184 -------------- drivers/staging/android/ion/ion_of.h | 37 --- drivers/staging/android/ion/ion_page_pool.c | 3 - drivers/staging/android/ion/ion_priv.h | 57 ++++- drivers/staging/android/ion/ion_system_heap.c | 14 +- drivers/staging/android/ion/tegra/Makefile | 1 - drivers/staging/android/ion/tegra/tegra_ion.c | 80 ------ include/linux/cma.h | 6 +- mm/cma.c | 25 +- mm/cma.h | 1 + mm/cma_debug.c | 2 +- 25 files changed, 312 insertions(+), 958 deletions(-) delete mode 100644 drivers/staging/android/ion/hisilicon/Kconfig delete mode 100644 drivers/staging/android/ion/hisilicon/Makefile delete mode 100644 drivers/staging/android/ion/hisilicon/hi6220_ion.c delete mode 100644 drivers/staging/android/ion/ion_dummy_driver.c create mode 100644 drivers/staging/android/ion/ion_enumerate.c delete mode 100644 drivers/staging/android/ion/ion_of.c delete mode 100644 drivers/staging/android/ion/ion_of.h delete mode 100644 drivers/staging/android/ion/tegra/Makefile delete mode 100644 drivers/staging/android/ion/tegra/tegra_ion.c