[mlir][gpu] Drop the explicit sm_70 from the CUDA WMMA integration tests (#219373)
Let the three TensorCore WMMA tests compile for the default chip.
CUDA 13 dropped Volta, so its `ptxas` no longer knows `sm_70`:
ptxas fatal : Value 'sm_70' is not defined for option 'gpu-name'
which fails all three tests on any machine with a current toolkit,
whatever GPU it has -- the arch is pinned in the RUN line and never
reached the hardware's own.
Nothing here needs the arch pinned. `sm_75` is already the default chip
of `gpu-lower-to-nvvm-pipeline`, of `nvvm-attach-target`, and of
`#nvvm.target`, and it is the oldest arch a current `ptxas` accepts; the
WMMA shapes these tests use are available there. Every other CUDA
integration test that doesn't need a specific arch takes that default,
so take it here too, and these tests follow the one place the minimum
supported arch is written down rather than pinning their own copy of it
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gstripe: Increase children I/O sizes
Originally gstripe created a separate child I/O for every accessed
stripe, making it very inefficient for small stripe sizes. Later
introduced "fast" mode reduced that count for read/write requests
by copying the data to/from temporary contiguous buffers, wasting
memory bandwidth and CPU time. This commit implements alternative
method, utilizing unmapped I/O mechanism to assemble children I/Os
from pages of the original I/O, avoiding any copying. This method
though has some limitations, such as stripe size can not be smaller
than CPU page size, or buffer and offset page phases should match
(may be page aligned, but not necessarily). But those limitations
are not an issue in many cases, since ZFS, for example, can often
align its buffers (BTW, dd doesn't). Plus, unlike "fast" method,
this one can receive (and even prefers) unmapped I/Os.
While there, re-implement also BIO_DELETE. Since they don't have
any data, there is no any reason to create more than one child I/O
per disk. It also dramatically improves performance there.
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[orc-rt] Replace Math.h in favor of bit.h. (#219390)
Replace isPowerOf2 with has_single_bit, and nextPowerOf2 with bit_width
(plus necessary arithmetic at the call sites, and a guard on the long
from sysconf in detectPageSize, which only excluded -1).
Bitmask enums must now have an unsigned underlying type (STL <bit> APIs
require it, and "bit.h" matches the STL).
snd_hdsp: Avoid allocation in the interrupt handler
Cache PCM children instead of calling device_get_children() from the
interrupt handler. Drain callbacks before child detach so cached
pointers cannot outlive the PCM softc. Allocate the parent softc by
its actual size.
This mirrors snd_hdspe's interrupt dispatch and detach lifecycle.
Reported by: christos
(cherry picked from commit 74db53d5d7657d0508940d1193f05a39df85434a)
