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All pointers passed as 64 bit long integer in the ABI in order to deal
with compat mode refer to user memory. Annotate their description
accordingly.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Enable drivers to create EVL factories in order to extend the core
services with new elements/features, benefiting from the object
lifetime management brought by the factory support.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

We need to wait for the synthetic irq fired by irq_work_queue() to be
delivered on the current CPU, so we'd better not stall the in-band
stage prior to waiting for the handler to complete (flush_work()).
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

This mode measures the delay between the moment a synthetic interrupt
is posted from the oob stage and when it is eventually received by its
in-band handler. When measured under significant pressure, this gives
the typical interrupt latency experienced by the in-band kernel due to
local interrupt disabling.

As a result of this change, the current ABI revision is bumped to 25.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

We should be able to read a complete message of the requested length
if O_NONBLOCK is clear. If set and some bytes are available, return
them.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Just like in the in-band case, we cannot fully rely on testing the
ring buffer for (non-)emptiness in order to detect data
availability. If so, kick the worker thread in order to perform some
readahead, as a last resort.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

!FMODE_STREAM does not tell us anything about atomic fpos handling,
although FMODE_STREAM would denote a non-seekable
file. FMODE_ATOMIC_POS is what we need to check instead.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Testing the input ring buffer for (non-)emptiness tells us nothing
about the readability of the target file, which may have data
available we did not pull into the buffer yet. We have to relay such
request to the driver actually handling this file in addition to
checking the ring buffer.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

A proxy should be usable for reading from an in-band file without
encurring a stage switch, just like it is for the output direction.

These changes introduce the EVL_CLONE_INPUT, EVL_CLONE_OUTPUT creation
flags for a proxy, which can be used in a mutually exclusive manner,
or combined in order to have a bidirectional channel to the target
file.

As a by-product, the output direction gains in-band poll() support.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Observables enable the observer design pattern, in which any number of
observer threads can be notified of updates to any number of
observable subjects, in a loosely coupled fashion. In the same move,
an EVL thread becomes in and of itself an observable which can be
monitored for events.

As a by-product, provide support for channeling SIGDEBUG notifications
to threads through their own observable on request instead of, or in
addition to issuing SIGDEBUG. The built-in runtime error detection
capabilities the core provides can feed health monitors, based on the
observability of threads.

The core switches to ABI 23 as a result of these changes.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Multiple concurrent writers could cause a missed wake up of the relay
worker, which would keep them blocked on the drain flag upon
contention indefinitely.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

We need a safe form of async workers to address the following issue:

CPU0: evl_call_inband*(arg=some_element)
CPU0:     irq_work_queue()
CPU0:          queue_work()
CPU1: release(element)
CPU1:     dispose(element)
CPU0:             work->handler(arg=some_element)
CPU0:                 invalid access to stale 'some_element'

evl_init_work_safe() guarantees integrity by holding a reference on
the given element from when evl_call_inband*() is issued until the
handler has completed.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

- EVL_THRIOC_UNBLOCK releases the target thread from any ongoing wait
  on a resource (does not apply to forcible suspension).

- EVL_THRIOC_DEMOTE unblocks and demotes the target thread to
  SCHED_WEAK.

- EVL_THRIOC_YIELD performs sched_yield().

In addition, EVL_THRIOC_SET/CLEAR_MODE are no more restricted to the
current thread over oob, which did not make much sense. Calls from
either in-band or oob are now allowed, and may target an arbitrary
thread.

These changes trigger a bump to ABI 22, although we keep on supporting
21.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

The ->sched_control() returns the length of the information block to
copy back to user, not a zero/non-zero status.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Allow users to decide whether a new element should be made public or
private at creation time, depending on a clone operation attribute.

A public element appears as a cdev in the /dev/evl hierarchy, which
means that it is visible to other processes (which was the static
default before this change). On the contrary, a private element is
only known from the process creating it, although it does appear in
the /sysfs hierarchy regardless.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Pinning is done relatively to the active rq of the current EVL thread,
which may be NULL since plain threads are allowed to set/get an EVL
timerfd.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

This fixes an infinite loop in the tp tick handler when advancing to
the next partition.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

tp_control() did not receive the proper input on tp_install requests,
neither did it return the proper information on tp_get. Great, fix
the mess.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Upon requests involving SCHED_TP, SCHED_QUOTA policies which have been
compiled out, we should send -EOPNOTSUPP instead of -EINVAL to the
caller, so that we can distinguish between lack of kernel support from
mere invalid argument issue.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

This code illustrates the usage of the out-of-band SPI transfer API in
kernel space, interfacing with the EVL core for synchronizing on
transfer completion events. It extends the SPIDEV ioctl() interface
with a few control requests for running out-of-band SPI transfers,
exporting the I/O buffer to applications via mmap() support.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Signed-off-by: Philippe Gerum <rpm@xenomai.org>

Adapt commit #133e996 from https://git.xenomai.org/xenomai

 fixing how
we recalculate the time budget of the running thread for the updated
group, for such thread only.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>