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Transfer commands can have associated GPU operations.
Enabled by passing GALLIUM_DDEBUG=transfers.
Reviewed-by: Marek Olšák <[email protected]>
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This patch has multiple goals:
1. Off-load the writing of records in 'always' mode to another thread
for performance.
2. Allow using ddebug with threaded contexts. This really forces us to
move some of the "after_draw" handling into another thread.
3. Simplify the different modes of ddebug, both in the code and in
the user interface, i.e. GALLIUM_DDEBUG. In particular, there's
no 'pipelined' anymore, since we're always pipelined; and 'noflush'
is replaced by 'flush', since we no longer flush by default.
4. Fix the fences in pipelining mode. They previously relied on writes
via pipe_context::clear_buffer. However, on radeonsi, those could
(quite reasonably) end up in the SDMA buffer. So we use the newly
added PIPE_FLUSH_{TOP,BOTTOM}_OF_PIPE fences instead.
5. Improve pipelined mode overall, using the finer grained information
provided by the new fences.
Overall, the result is that pipelined mode should be more useful, and
using ddebug in default mode is much less invasive, in the sense that
it changes the overall driver behavior less (which is kind of crucial
for a driver debugging tool).
An example of the new hang debug output:
Gallium debugger active.
Hang detection timeout is 1000ms.
GPU hang detected, collecting information...
Draw # driver prev BOP TOP BOP dump file
-------------------------------------------------------------
2 YES YES YES NO /home/nha/ddebug_dumps/shader_runner_19919_00000000
3 YES NO YES NO /home/nha/ddebug_dumps/shader_runner_19919_00000001
4 YES NO YES NO /home/nha/ddebug_dumps/shader_runner_19919_00000002
5 YES NO YES NO /home/nha/ddebug_dumps/shader_runner_19919_00000003
Done.
We can see that there were almost certainly 4 draws in flight when
the hang happened: the top-of-pipe fence was signaled for all 4 draws,
the bottom-of-pipe fence for none of them. In virtually all cases,
we'd expect the first draw in the list to be at fault, but due to the
GPU parallelism, it's possible (though highly unlikely) that one of
the later draws causes a component to get stuck in a way that prevents
the earlier draws from making progress as well.
(In the above example, there were actually only 3 draws truly in flight:
the last draw is a blit that waits for the earlier draws; however, its
top-of-pipe fence is emitted before the cache flush and wait, and so
the fact that the draw hasn't truly started yet can only be seen from a
closer inspection of GPU state.)
Acked-by: Marek Olšák <[email protected]>
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This is optional (and no CAP).
Implemented by radeonsi, ddebug, rbug, trace.
Reviewed-by: Daniel Stone <[email protected]>
Reviewed-by: Nicolai Hähnle <[email protected]>
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v2: remove unnecessary returns
v3 (Timothy Arceri): updated trace
v4 (Timothy Arceri): actually dump the params in trace
Signed-off-by: Andres Rodriguez <[email protected]>
Reviewed-by: Marek Olšák <[email protected]> (v2)
Reviewed-by: Samuel Pitoiset <[email protected]>
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v2: fix comment regarding fd ownership, define pipe_memory_object
v3: remove stray return
v4 (Timothy Arceri): update trace
v5 (Timothy Arceri): actually dump the params in trace
Reviewed-by: Marek Olšák <[email protected]> (v3)
Reviewed-by: Samuel Pitoiset <[email protected]>
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Trivial.
Signed-off-by: Samuel Pitoiset <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
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NIR shaders are not captured properly in pipelined mode currently. This
would require shader cloning, which requires linking all the Gallium
drivers against NIR. We can always do that later.
v2: avoid immediate crashes in pipelined mode
Reviewed-by: Marek Olšák <[email protected]> (v1)
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Reviewed-by: Edward O'Callaghan <[email protected]>
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Reviewed-by: Nicolai Hähnle <[email protected]>
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Add resource_changed to the ddebug, rbug, and trace wrappers. Since it
is optional, there is no need to add it to noop.
Signed-off-by: Philipp Zabel <[email protected]>
Suggested-by: Nicolai Hähnle <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Signed-off-by: Lucas Stach <[email protected]>
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broken recently
Reviewed-by: Nicolai Hähnle <[email protected]>
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radeonsi needs to do some operations (DCC decompression) for OpenGL-OpenCL
interop and this is the only way to make it coherent with the current
context. It can optionally be set to NULL.
Reviewed-by: Brian Paul <[email protected]>
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required by glClientWaitSync (GL 4.5 Core spec) that can optionally flush
the context
Reviewed-by: Rob Clark <[email protected]>
Reviewed-by: Nicolai Hähnle <[email protected]>
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For good performance while being able to generate decent hang reports.
The report doesn't contain the parsed IB and the buffer list, but it
isolates the draw call and dumps shaders while not having to flush
the context.
This is for GPU hangs that are harder to reproduce and require interactive
playing for minutes or even hours.
dd_pipe.h explains some implementation details. Initializing, copying
(recording) and clearing states is most of the code.
The performance should be at least 50% of the normal performance depending
on the circumstances. (i.e. 50% is expected to be the worst case scenario,
not the best case) The majority of time is spent in
dump_debug_state(PIPE_DUMP_CURRENT_SHADERS) and that's after all
the optimizations in later patches. There is no obvious way to optimize
that further.
Reviewed-by: Nicolai Hähnle <[email protected]>
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Reviewed-by: Nicolai Hähnle <[email protected]>
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Signed-off-by: Andreas Boll <[email protected]>
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Reviewed-by: Bas Nieuwenhuizen <[email protected]>
Reviewed-by: Nicolai Hähnle <[email protected]>
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Signed-off-by: Bas Nieuwenhuizen <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
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Signed-off-by: Bas Nieuwenhuizen <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
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This will allow drivers to make better decisions about texture sharing
for DRI2, DRI3, Wayland, and OpenCL.
v2: add read/write flags, take advantage of __DRI_IMAGE_USE_BACKBUFFER
Reviewed-by: Axel Davy <[email protected]>
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This currently just writes out the name of dump files, which can be useful
to easily correlate those files with other log outputs (driver debug output,
apitrace calls, etc.)
Reviewed-by: Marek Olšák <[email protected]>
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This changes the default behavior of 'always' mode to be consistent with
hang detection mode.
I have used this to more easily compare dumped command streams using diff.
Reviewed-by: Marek Olšák <[email protected]>
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When we know that hangs occur only very late in a reproducible run (e.g.
apitrace), we can save a lot of debugging time by skipping the flush and hang
detection for earlier draw calls.
Reviewed-by: Marek Olšák <[email protected]>
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v2: lots of improvements
This is like identity or trace, but simpler. It doesn't wrap most states.
Run with:
GALLIUM_DDEBUG=1000 [executable]
where "executable" is the app and "1000" is in miliseconds, meaning that
the context will be considered hung if a fence fails to signal in 1000 ms.
If that happens, all shaders, context states, bound resources, draw
parameters, and driver debug information (if any) will be dumped into:
/home/$username/dd_dumps/$processname_$pid_$index.
Note that the context is flushed after every draw/clear/copy/blit operation
and then waited for to find the exact call that hangs.
You can also do:
GALLIUM_DDEBUG=always
to do the dumping after every draw/clear/copy/blit operation without
flushing and waiting.
Examples of driver states that can be dumped are:
- Hardware status registers saying which hw block is busy (hung).
- Disassembled shaders in a human-readable form.
- The last submitted command buffer in a human-readable form.
v2: drop pipe-loader changes, drop SConscript
rename dd.h -> dd_pipe.h
Acked-by: Christian König <[email protected]>
Acked-by: Alex Deucher <[email protected]>
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