Rather than looking at the pool of completions for spinning use an
atomic counter of total completions ever done. The relative number of
completions being waited on by rtio_submit may then always be correctly
done.
Prior to this a race was possible, and understood, as
rtio_cqe_consumable was a likely but not guaranteed count of completions.
Sure enough on an SMP system the likely count was ahead of the actual
available completions and a race was caught by the simple test case.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
The test case test_spsc_throughput reuse spsc without reset. Fix it by
resetting the spsc before the test case starts.
Signed-off-by: Jaxson Han <jaxson.han@arm.com>
When writing a test suite, it's more common to want the 'before'
hook to run in privilaged mode, even when the test is run in userspace.
Reconfigure ztest to first run the test thread callback in privilaged
mode and only enter userspace after the test rule and suite's 'before'
functions ran.
Signed-off-by: Yuval Peress <peress@google.com>
- Add a new API `rtio_sqe_cancel` to attempt canceling a queued SQE
- Add a new syscall `rtio_sqe_copy_in_get_handles` which allows getting
back the SQE handles generated by the copy_in operation so that they
can be canceled.
Signed-off-by: Yuval Peress <peress@google.com>
Twister now supports using YAML lists for all fields that were written
as space-separated lists. Used twister_to_list.py script. Some artifacts
on string length are due to how ruamel dumps content.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
Reworks the zephyr macros and pools to be objects in their own right. Each
pool can be statically defined with a Z_ private macro. The objects can
then be initialized with an rtio instance statically.
This cleans up a lot of code that was otherwise doing little bits of
management around allocation/freeing and reduces the scope those functions
has to the data it needs.
This should enable sharing the pools of sqe, cqe, and mem blocks among rtio
instances in a future improvement easily.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
On non-smp systems where multiple cores aren't in play atomics aren't
really necessary and volatile can be used in stead.
Additionally marks the push function as ALWAYS_INLINE as I saw at times
it was not being inlined.
MPSC operation speed is crucial to the performance of rtio, these changes
provided a 30% throughput improvmement in the throughput test.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
Rather than the rings, which weren't shared between userspace and kernel
space in Zephyr like they are in Linux with io_uring, use atomic mpsc
queues for submission and completion queues.
Most importantly this removes a potential head of line blocker in the
submission queue as the sqe would be held until a task is completed.
As additional bonuses this avoids some additional locks and restrictions
about what can be submitted and where. It also removes the need for
two executors as all chains/transactions are done concurrently.
Lastly this opens up the possibility for a common pool of sqe's to
allocate from potentially saving lots of memory.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
It was previously assumed that the 'sys_mem_blocks' struct would maintain
information about contiguous blocks allocated so the release API only
took the starting address. This led to an issue where allocating 2+
blocks would end up with a memory leak because any block not being the
first would never be released.
Add the buffer length as an argument so the correct number of blocks can
be released. Also, ammend the tests to match and verify.
Signed-off-by: Yuval Peress <peress@google.com>
When building the rtio_api tests with arm-clang we get the following
compiler warning:
rtio_api/src/test_rtio_api.c:436:58: warning: format specifies type
'unsigned long' but the argument has type 'uintptr_t'
(aka 'unsigned int') [-Wformat]
TC_PRINT("userdata is %p, value %lu\n", cqe->userdata, idx);
~~~ ^~~
%u
Use PRIuPTR to fix the issue.
Signed-off-by: Kumar Gala <kumar.gala@intel.com>
- Introduce a new Kconfig to enable mempool in RTIO
- Introduce a new RTIO_DEFINE_WITH_MEMPOOL to allocate an RTIO context
with an associated memory pool.
- Add a new sqe read function rtio_sqe_read_with_pool() for memory pool
enabled RTIO contexts
- Allow IODevs to allocate only the memory they need via rtio_sqe_rx_buf()
- Allow the consumer to get the allocated buffer via
rtio_cqe_get_mempool_buffer()
- Consumers need to release the buffer via rtio_release_buffer() when
processing is complete.
Signed-off-by: Yuval Peress <peress@google.com>
Update the policy such that every completed sqe has a parallel cqe.
This has the primary purpose of making any reads in the sqe visible
to the consumer (since they might have different buffers).
Signed-off-by: Yuval Peress <peress@google.com>
The pending_sqe logic to track where in the ring queue the concurrent
executor had left off was slightly flawed. It didn't account for starting
all sqes in the queue and ending back up at the beginning.
Instead track the last SQE in the queue, from which the next one in the
queue will the one to start next.
If we happen to sweep the last known SQE in the queue, reset it to NULL
so the next time prepare is called we start at the beginning of the queue
again.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
Transactional submissions treat a sequence of sqes as a single atomic
submission given to a single iodev and expect as a reply a single
completion.
This is useful for scatter gather like APIs that exist in Zephyr already
for I2C and SPI.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
The test suites have grown to cover different units really and having
them in one file was becoming a bit much to scroll around in.
Coincidentally found a accidental reuse of a define between the spsc and
mpsc tests.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
Race was possible though very unlikely between the atomic cas
and queue push/pop operations. The outcome of the race had it shown up
would have been a submission not worked on due to the timer never being
started. A small critical section fixes this and clarifies where the single
conumer part of the mpsc queue comes in despite there being multiple
contexts which may enter that section.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
Noticed the tests were a bit verbose, saw a few stray printks. Drop those
as they aren't really needed and potentially cause testing issues, printk
is a potential synchronization point.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
Renode platform fails the test despite it working well on qemu riscv.
Ignore this particular platform for now.
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
