Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Miguel Jimenez Lopez <klyone@ugr.es>
Acked-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

Add to zio_device, zio_cset and zio_channel a new operation: change_flags.
The core uses this function to signal to the driver that some flags are changed.

This patch also improve the comment on the __zobj_enable function
Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

Currently the trigger abort function returns only the previous value
of the status flag, but actually we had always used it as if it was
the entire flag, and this can break "self timed" applications on
trigger configuration.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Use a generic implementation of ti->push_block() in order to avoid
code duplication and different behaviors on output configuration.
(it will be more clear with multishot implementation)
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

The new option is "prefer-new" and it is boolean.

0 means that you prefer old blocks. So, when buffer is full all new
incoming blocks will be discarder.

1 means that you prefer new blocks. So, when buffer is full the oldest
block is removed in order to store the new one
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

If the driver call data_done when the trigger was un-armed, then print a
debug message. This is useful on driver development.

Theoretically, this code should not be compiled if we are not setting -DDEBUG
Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

The trigger *must* be disable while a configuration operation is
running. It was not the case. Before this patch the behavior was:

config -> disable -> propagate -> enable

With this path

disable -> config -> propagate -> enable
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

Checking that a given value is in a range is a typical
operation. This patch include this control in the framework
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

If an arm occurs while we are resizing the buffer it may gets the wrong
pointers.

For example, this is the case when we use the 'user' trigger. Because we
want to remove all blocks from the buffer before resize it, we are
calling retr_block() which internally does pull() and the trigger user
on pull calls arm().
Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

This avoid driver developer to handle with cset flags and locking. It
also simplify the driver code.

set and clear helpers can be locked; the 'if' statement doesn't slow
down the code because the compiler will remove it according to the
function argument (only if you pass static value)
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

Mapping zio_block to a scatterlist is a common operations. This patch
simply adds a set of helpers to manage the scatter DMA mapping.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

It will be necessary on "write control" patch

Now the __zattr_propagate_value() function can be used internally by ZIO
components
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

It will be necessary on "write control" patch

Split the zattr_store() function in two parts. The configuration
function __zio_conf_set(), and the sysfs write access zattr_store. The
config function is exported in order to be used by others within the
framework
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

It will be necessary on "write control" patch

In order to export the function to other ZIO core parts, this patch
rename __get_spinlock() with a proper name and export the prototype
within the framework
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
cked-by: Alessandro Rubini <rubini@gnudd.com>

It will be necessary on "write control" patch

In order to export the function to other ZIO core parts, this patch
rename the zobj_enable function with a proper name, and change the
prototype to use the zio object head instead of the kernel device.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

make available enumeration of standard attributes also for userspace
applications
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

It will be necessary on "write control" patch

This allows to easily retrieve the ZIO object that owns a
given zio_attribute
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

it reduces the number of printed data. The option accepts a numeric value.
This value is the number of bytes to show at the beginning and at
the end of a buffer
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

The parameter attributes (outside the control) do not have an index.
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Thanks to this patch all user-space applications depends only on the
zio-user.h header
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Alessandro Rubini <rubini@gnudd.com>

Add "-s", so the dumper knows the file argument is a sequence
of control structures, with no data intermixed.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Federico Vaga <federico.vaga@gmail.com>

/dev/zio-sniff.ctrl is a misc device, selected by CONFIG_ZIO_SNIFF_DEV
which currently is on by default.  Every time a block is released,
a copy of the control is delivered to every reader of the device.

This is meant to be useful for monitoring, and to retrieve the
perfomance figures that will be added by later commits.  We need
a sniff device to monitor output channels, because even the application
driving I/O cannot recover the control structures that leave the
ZIO pipeline.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Federico Vaga <federico.vaga@gmail.com>