The idea is good, define the heap ids in header file is inconvenient. But if we query the heaps information from user-space.
It need to maintain this ids and name userspace one by one. The code may be complicated in different module user-space. In android, the gralloc and other lib will all use ion to alloc memory. This will make it more difficult to maintain user-space code. But beyond this, The new alloc2 with not-handle flag is good. And the pull out of ioctl interface is also a good cleanup. On 2016/6/7 2:23, Laura Abbott wrote: > > The ABI for Ion's ioctl interface are a pain to work with. The heap IDs > are a 32-bit non-discoverable namespace that form part of the ABI. There's > no way to determine what ABI version is in use which leads to problems > if the ABI changes or needs to be updated. > > This series is a first approach to give a better ABI for Ion. This includes: > > - Following the advice in botching-up-ioctls.txt > - Ioctl for ABI version > - Dynamic assignment of heap ids > - queryable heap ids > - Runtime mapping of heap ids, including fallbacks. This avoids the need to > encode the fallbacks as an ABI. > > I'm most interested in feedback if this ABI is actually an improvement and > usable. The heap id map/query interface seems error prone but I didn't have > a cleaner solution. There aren't any kernel APIs for the new features as the > focus was on a userspace API but I anticipate that following easily once > the userspace API is established. > > > Thanks, > Laura > > P.S. Not to turn this into a bike shedding session but if you have suggestions > for a name for this framework other than Ion I would be interested to hear > them. Too many other things are already named Ion. > > Laura Abbott (6): > staging: android: ion: return error value for ion_device_add_heap > staging: android: ion: Switch to using an idr to manage heaps > staging: android: ion: Drop heap type masks > staging: android: ion: Pull out ion ioctls to a separate file > staging: android: ion: Add an ioctl for ABI checking > staging: android: ion: Introduce new ioctls for dynamic heaps > > drivers/staging/android/ion/Makefile | 3 +- > drivers/staging/android/ion/ion-ioctl.c | 243 ++++++++++++++++++ > drivers/staging/android/ion/ion.c | 438 > ++++++++++++++++---------------- > drivers/staging/android/ion/ion_priv.h | 109 +++++++- > drivers/staging/android/uapi/ion.h | 164 +++++++++++- > 5 files changed, 728 insertions(+), 229 deletions(-) > create mode 100644 drivers/staging/android/ion/ion-ioctl.c > _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
