dma-fence: Use kernel's sort for merging fences

One alternative to the fix Christian proposed in
https://lore.kernel.org/dri-devel/20241024124159.4519-3-christian.koenig@amd.com/
is to replace the rather complex open coded sorting loops with the kernel
standard sort followed by a context squashing pass.

Proposed advantage of this would be readability but one concern Christian
raised was that there could be many fences, that they are typically mostly
sorted, and so the kernel's heap sort would be much worse by the proposed
algorithm.

I had a look running some games and vkcube to see what are the typical
number of input fences. Tested scenarios:

1) Hogwarts Legacy under Gamescope

450 calls per second to __dma_fence_unwrap_merge.

Percentages per number of fences buckets, before and after checking for
signalled status, sorting and flattening:

   N       Before      After
   0       0.91%
   1      69.40%
  2-3     28.72%       9.4%  (90.6% resolved to one fence)
  4-5      0.93%
  6-9      0.03%
  10+

2) Cyberpunk 2077 under Gamescope

1050 calls per second, amounting to 0.01% CPU time according to perf top.

   N       Before      After
   0       1.13%
   1      52.30%
  2-3     40.34%       55.57%
  4-5      1.46%        0.50%
  6-9      2.44%
  10+      2.34%

3) vkcube under Plasma

90 calls per second.

   N       Before      After
   0
   1
  2-3      100%         0%   (Ie. all resolved to a single fence)
  4-5
  6-9
  10+

In the case of vkcube all invocations in the 2-3 bucket were actually
just two input fences.

From these numbers it looks like the heap sort should not be a
disadvantage, given how the dominant case is <= 2 input fences which heap
sort solves with just one compare and swap. (And for the case of one input
fence we have a fast path in the previous patch.)

A complementary possibility is to implement a different sorting algorithm
under the same API as the kernel's sort() and so keep the simplicity,
potentially moving the new sort under lib/ if it would be found more
widely useful.

v2:
 * Hold on to fence references and reduce commentary. (Christian)
 * Record and use latest signaled timestamp in the 2nd loop too.
 * Consolidate zero or one fences fast paths.

v3:
 * Reverse the seqno sort order for a simpler squashing pass. (Christian)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Fixes: 245a4a7b531c ("dma-buf: generalize dma_fence unwrap & merging v3")
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3617
Cc: Christian König <christian.koenig@amd.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Friedrich Vock <friedrich.vock@gmx.de>
Cc: linux-media@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linaro-mm-sig@lists.linaro.org
Cc: <stable@vger.kernel.org> # v6.0+
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241115102153.1980-3-tursulin@igalia.com

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