Re: [PATCH] dma-fence: basic lockdep annotations

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On 6/5/20 3:29 PM, Daniel Vetter wrote:
Design is similar to the lockdep annotations for workers, but with
some twists:

- We use a read-lock for the execution/worker/completion side, so that
   this explicit annotation can be more liberally sprinkled around.
   With read locks lockdep isn't going to complain if the read-side
   isn't nested the same way under all circumstances, so ABBA deadlocks
   are ok. Which they are, since this is an annotation only.

- We're using non-recursive lockdep read lock mode, since in recursive
   read lock mode lockdep does not catch read side hazards. And we
   _very_ much want read side hazards to be caught. For full details of
   this limitation see

   commit e91498589746065e3ae95d9a00b068e525eec34f
   Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
   Date:   Wed Aug 23 13:13:11 2017 +0200

       locking/lockdep/selftests: Add mixed read-write ABBA tests

- To allow nesting of the read-side explicit annotations we explicitly
   keep track of the nesting. lock_is_held() allows us to do that.

- The wait-side annotation is a write lock, and entirely done within
   dma_fence_wait() for everyone by default.

- To be able to freely annotate helper functions I want to make it ok
   to call dma_fence_begin/end_signalling from soft/hardirq context.
   First attempt was using the hardirq locking context for the write
   side in lockdep, but this forces all normal spinlocks nested within
   dma_fence_begin/end_signalling to be spinlocks. That bollocks.

   The approach now is to simple check in_atomic(), and for these cases
   entirely rely on the might_sleep() check in dma_fence_wait(). That
   will catch any wrong nesting against spinlocks from soft/hardirq
   contexts.

The idea here is that every code path that's critical for eventually
signalling a dma_fence should be annotated with
dma_fence_begin/end_signalling. The annotation ideally starts right
after a dma_fence is published (added to a dma_resv, exposed as a
sync_file fd, attached to a drm_syncobj fd, or anything else that
makes the dma_fence visible to other kernel threads), up to and
including the dma_fence_wait(). Examples are irq handlers, the
scheduler rt threads, the tail of execbuf (after the corresponding
fences are visible), any workers that end up signalling dma_fences and
really anything else. Not annotated should be code paths that only
complete fences opportunistically as the gpu progresses, like e.g.
shrinker/eviction code.

The main class of deadlocks this is supposed to catch are:

Thread A:

	mutex_lock(A);
	mutex_unlock(A);

	dma_fence_signal();

Thread B:

	mutex_lock(A);
	dma_fence_wait();
	mutex_unlock(A);

Thread B is blocked on A signalling the fence, but A never gets around
to that because it cannot acquire the lock A.

Note that dma_fence_wait() is allowed to be nested within
dma_fence_begin/end_signalling sections. To allow this to happen the
read lock needs to be upgraded to a write lock, which means that any
other lock is acquired between the dma_fence_begin_signalling() call and
the call to dma_fence_wait(), and still held, this will result in an
immediate lockdep complaint. The only other option would be to not
annotate such calls, defeating the point. Therefore these annotations
cannot be sprinkled over the code entirely mindless to avoid false
positives.

Originally I hope that the cross-release lockdep extensions would
alleviate the need for explicit annotations:

https://lwn.net/Articles/709849/

But there's a few reasons why that's not an option:

- It's not happening in upstream, since it got reverted due to too
   many false positives:

	commit e966eaeeb623f09975ef362c2866fae6f86844f9
	Author: Ingo Molnar <mingo@xxxxxxxxxx>
	Date:   Tue Dec 12 12:31:16 2017 +0100

	    locking/lockdep: Remove the cross-release locking checks

	    This code (CONFIG_LOCKDEP_CROSSRELEASE=y and CONFIG_LOCKDEP_COMPLETIONS=y),
	    while it found a number of old bugs initially, was also causing too many
	    false positives that caused people to disable lockdep - which is arguably
	    a worse overall outcome.

- cross-release uses the complete() call to annotate the end of
   critical sections, for dma_fence that would be dma_fence_signal().
   But we do not want all dma_fence_signal() calls to be treated as
   critical, since many are opportunistic cleanup of gpu requests. If
   these get stuck there's still the main completion interrupt and
   workers who can unblock everyone. Automatically annotating all
   dma_fence_signal() calls would hence cause false positives.

- cross-release had some educated guesses for when a critical section
   starts, like fresh syscall or fresh work callback. This would again
   cause false positives without explicit annotations, since for
   dma_fence the critical sections only starts when we publish a fence.

- Furthermore there can be cases where a thread never does a
   dma_fence_signal, but is still critical for reaching completion of
   fences. One example would be a scheduler kthread which picks up jobs
   and pushes them into hardware, where the interrupt handler or
   another completion thread calls dma_fence_signal(). But if the
   scheduler thread hangs, then all the fences hang, hence we need to
   manually annotate it. cross-release aimed to solve this by chaining
   cross-release dependencies, but the dependency from scheduler thread
   to the completion interrupt handler goes through hw where
   cross-release code can't observe it.

In short, without manual annotations and careful review of the start
and end of critical sections, cross-relese dependency tracking doesn't
work. We need explicit annotations.

v2: handle soft/hardirq ctx better against write side and dont forget
EXPORT_SYMBOL, drivers can't use this otherwise.

v3: Kerneldoc.

v4: Some spelling fixes from Mika

v5: Amend commit message to explain in detail why cross-release isn't
the solution.

Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
Cc: Thomas Hellstrom <thomas.hellstrom@xxxxxxxxx>
Cc: linux-media@xxxxxxxxxxxxxxx
Cc: linaro-mm-sig@xxxxxxxxxxxxxxxx
Cc: linux-rdma@xxxxxxxxxxxxxxx
Cc: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
---

Reviewed-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxx>


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