Skip to content

GitLab

Switch branch/tag
  1. 22 Nov, 2019 1 commit
  3. 03 Nov, 2019 1 commit
    • Rahix's avatar
      feat(epicardium): Add a proper mutex implementation · 9a5a46cd
      Rahix authored 
      

In the current firmware, different locking mechanisms a littered around
the code-base.  Among them are bare FreeRTOS mutexes and the hw-locks.
The callers for these often specify timeouts but don't make much effort
in A) picking robust values for the timeout and B) recovering gracefully
from a timeout happening.  Most of the time, we return -EBUSY to _Python
code_.  This is really really bad API design.  The firmware needs to
have enough integrity to ensure these situations can't ever occur.

To combat this, add a new locking primitive: The `struct mutex`.  The
intention is to replace all other locking and synchronization APIs with
this one.  This will provide one central place to debug any sort of
locking issues.

The `struct mutex` API is based on a few assumptions about locking.
Those are detailed in `Documentation/epicardium/mutex.rst`, which is
part of this commit.  The most important one is:

    Locking can **never** fail.

By requiring this to be true, we eliminate the need for drivers to
contain (often incorrect) logic for dealing with locking fails.  This
should drastically improve the stability of the firmware in regards to
lock-related bugs.

This commit does not introduce any functional changes yet.
Signed-off-by: Rahix's avatarRahix <rahix@rahix.de>
      9a5a46cd
  5. 04 Oct, 2019 1 commit
  7. 31 Aug, 2019 1 commit
  9. 23 Aug, 2019 2 commits
  11. 22 Aug, 2019 3 commits
  13. 21 Aug, 2019 1 commit
  15. 20 Aug, 2019 1 commit
  17. 19 Aug, 2019 3 commits
  19. 17 Aug, 2019 1 commit
  21. 15 Aug, 2019 1 commit
  23. 12 Aug, 2019 2 commits
  25. 01 Aug, 2019 1 commit
  27. 22 Jul, 2019 1 commit
  29. 21 Jul, 2019 2 commits
  31. 20 Jul, 2019 1 commit
  33. 17 Jul, 2019 1 commit
  35. 16 Jul, 2019 2 commits
  37. 14 Jul, 2019 5 commits
  39. 12 Jul, 2019 1 commit
  41. 08 Jul, 2019 2 commits