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This patch makes use of the DRM_IOCTL_VC4_GEM_MADVISE ioctl to mark all
BOs placed in the mesa BO cache as purgeable so that the system can
reclaim this memory under memory pressure.
v2:
- Removed BOs from the cache when they've been purged by the kernel
- Check whether the madvise ioctl is supported or not before using it
v3: Don't walk the whole list when we find a busy BO (by anholt, acked by
Boris)
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
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It was calling down into i915 trying to label the BO, which is definitely
not the right thing.
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I remember thinking "gosh, it would be nice if I could do a kernel-style
'if (!IS_ENABLED(DEBUG))' instead of using an #ifdef, so the code was
compiled on both builds", and then forgot to test a release build anyway.
Fixes: a8fd58eae596 ("vc4: Add labels to BOs for debug builds or with VC4_DEBUG=surf set.")
Reported-by: Derek Foreman <derekf@osg.samsung.com>
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This has proven to be incredibly useful for debugging CMA allocation
failures and driving memory management improvements. However, we don't
want to burden entry and exit from the BO cache with the labeling ioctl's
overhead on release builds.
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cleared_and_retried is always reset to false when jumping to the retry
label, thus leading to an infinite retry loop.
Fix that by moving the cleared_and_retried variable definitions at the
beginning of the function. While we're at it, move the create variable
with the other local variables and explicitly reset its content in the
retry path.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Fixes: 78087676c98aa8884ba92 "vc4: Restructure the simulator mode."
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pipe_mutex_unlock() was made unnecessary with fd33a6bcd7f12.
Replaced using:
find ./src -type f -exec sed -i -- \
's:pipe_mutex_unlock(\([^)]*\)):mtx_unlock(\&\1):g' {} \;
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
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replace pipe_mutex_lock() was made unnecessary with fd33a6bcd7f12.
Replaced using:
find ./src -type f -exec sed -i -- \
's:pipe_mutex_lock(\([^)]*\)):mtx_lock(\&\1):g' {} \;
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
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One tiny hack is left in vc4_bufmgr.c for what kind of mapping we got so
that we can free it.
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Now we aren't limited to 256MB total allocated across a driver instance,
just 256MB at one time. We're still copying in and out, which should get
fixed.
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Rather than having simulator mode changes scattered around vc4_bufmgr.c
and vc4_screen.c, make vc4_bufmgr.c just call a vc4_simulator_ioctl, which
then dispatches to a corresponding implementation.
This will give the simulator support a centralized place to do tricks like
storing most BOs directly in simulator memory rather than copying in and
out.
This leaves special casing of mmaping BOs and execution, because of the
winsys mapping.
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This helps in debugging memory pressure. It would be nice if we could
tell valgrind about it all the way from allocation time to destroy, but we
need a pointer to hand to VALGRIND_MALLOCLIKE_BLOCK.
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It is necessary to reuse existing BOs when dmabufs are imported. There
are 2 cases that need to be handled. dmabufs can be created/exported and
imported by the same process and can be imported multiple times.
Copying other drivers, add a hash table to track exported BOs so the
BOs get reused.
v2: Whitespace fixup (by anholt)
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
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I was afraid our callers weren't prepared for this, but it looks like
at least for resource creation, mesa/st throws an error appropriately.
Cc: "11.0" <mesa-stable@lists.freedesktop.org>
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This greatly increases the pressure you can put on the driver before
create fails. Ultimately we need to let the kernel take control of
our cached BOs and just take them from us (and other clients)
directly, but this is a very easy patch for the moment.
Cc: "11.0" <mesa-stable@lists.freedesktop.org>
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It's surprising to see "0kb" printed for debug on short shaders, while
4kb alignment won't be suprising.
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60MB of cached BOs are a lot less scary than 600MB.
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This gives the kernel a chance to validate and lock down the data,
without having to deal with mmap zapping.
With this, GLBenchmark stops on a texture relocations, because we'd
recycled a shader BO as another shader and failed to revalidate, since we
weren't clearing the cached validation state on mmap faults.
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I accidentally shadowed the outside declaration, so we always returned
NULL even when we'd found something in the cache.
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This is useful for BO leak debugging.
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list.h is a nicer and more familiar set of list functions/macros.
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We were returning the most recently freed BO, without checking if it
was idle yet. This meant that we generally stalled immediately on the
previous frame when generating a new one. Instead, allocate new BOs
when the *oldest* BO is still busy, so that the cache scales with how
much is needed to keep some frames outstanding, as originally
intended.
Note that if you don't have some throttling happening, this means that
you can accidentally run the system out of memory. The kernel is now
applying some throttling on all execs, to hopefully avoid this.
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If the wait ever returned -ETIME, we'd abort because the errno was
stored in errno and not drmIoctl()'s return value.
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We'd sometimes try to reallocate something that X was using as a new
pipe_resource, and potentially conflict in our rendering. But even
worse, if we reallocated the BO as a shader, the kernel would reject
rendering using the shader.
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They don't do anything special for us, but I've been told by kernel
maintainers that relying on dumb for my acceleration-capable buffers
is not OK.
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I'd like to compile as much of the device-specific code as possible
when building for simulator, and using if (using_simulator) instead of
ifdefs helps.
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Any other caller would want it, too.
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Since our kernel BOs require CMA allocation, and the use of them requires
new mmaps, it's pretty expensive and we should avoid it if possible.
Copying my original design for Intel, make a userspace cache that reuses
BOs that haven't been shared to other processes but frees BOs that have
sat in the cache for over a second.
Improves glxgears framerate on RPi by around 30%.
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This gets DRI3 working on modesetting with glamor. It's not enabled under
simulation, because it looks like handing our dumb-allocated buffers off
to the server doesn't actually work for the server's rendering.
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Our submits now return immediately and you have to manually wait for
things to complete if you want to (like a normal driver).
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These are pretty catastrophic, "should never happen" failure paths (though
4 tests in piglit hit them currently, due to a single bug). An abort()
that you can gdb on easily is probably more useful than a clean exit,
particularly since a bug in piglit framework right now is causing early
exit(1)s to simply not be recorded in the results at all.
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Fixes valgrind complaints from valgrind being unaware of our ioctls.
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There are a few tools I want to have always available, and fprintf() and
abort() are among them.
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When you're debugging validation, it's nice to know what the BOs are for.
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In addition to reducing sim-specific code, it also avoids our local handle
allocation conflicting with the host GEM's handle numbering, which was
causing vc4_gem_hindex() to not distinguish between winsys BOs and the
same-numbered non-winsys bo.
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Otherwise it'll stick around forever.
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This ensures that when I'm using the simulator, I get a closer match to
what behavior on real hardware will be. It lets me rapidly iterate on the
kernel validation code (which otherwise has a several-minute turnaround
time), and helps catch buffer overflow bugs in the userspace driver
faster.
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This mostly just takes every draw call and turns it into a sequence of
commands that clear the FBO and draw a single shaded triangle to it,
regardless of the actual input vertices or shaders. I copied the initial
driver skeleton mostly from freedreno, and I've preserved Rob Clark's
copyright for those. I also based my initial hardcoded shaders and
command lists on Scott Mansell (phire)'s "hackdriver" project, though the
bit patterns of the shaders emitted end up being different.
v2: Rebase on gallium megadrivers changes.
v3: Rebase on PIPE_SHADER_CAP_MAX_CONSTS change.
v4: Rely on simpenrose actually being installed when building for
simulation.
v5: Add more header duplicate-include guards.
v6: Apply Emil's review (protection against vc4 sim and ilo at the same
time, and dropping the dricommon drm bits) and fix a copyright header
(thanks, Roland)
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