genirq/irq_sim: add an extended irq_sim initializer

Currently users of the interrupt simulator don't have any way of being
notified about interrupts from the simulated domain being requested or
rele

genirq/irq_sim: add an extended irq_sim initializer

Currently users of the interrupt simulator don't have any way of being
notified about interrupts from the simulated domain being requested or
released. This causes a problem for one of the users - the GPIO
simulator - which is unable to lock the pins as interrupts.

Define a structure containing callbacks to be executed on various
irq_sim-related events (for now: irq request and release) and provide an
extended function for creating simulated interrupt domains that takes it
and a pointer to custom user data (to be passed to said callbacks) as
arguments.

Reviewed-by: Linus Walleij <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bartosz Golaszewski <[email protected]>

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genirq/irq_sim: Simplify the API

The interrupt simulator API exposes a lot of custom data structures and
functions and doesn't reuse the interfaces already exposed by the irq
subsystem. This patch t

genirq/irq_sim: Simplify the API

The interrupt simulator API exposes a lot of custom data structures and
functions and doesn't reuse the interfaces already exposed by the irq
subsystem. This patch tries to address it.

We hide all the simulator-related data structures from users and instead
rely on the well-known irq domain. When creating the interrupt simulator
the user receives a pointer to a newly created irq_domain and can use it
to create mappings for simulated interrupts.

It is also possible to pass a handle to fwnode when creating the simulator
domain and retrieve it using irq_find_matching_fwnode().

The irq_sim_fire() function is dropped as well. Instead we implement the
irq_get/set_irqchip_state interface.

We modify the two modules that use the simulator at the same time as
adding these changes in order to reduce the intermediate bloat that would
result when trying to migrate the drivers in separate patches.

Signed-off-by: Bartosz Golaszewski <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Acked-by: Jonathan Cameron <[email protected]> #for IIO
Link: https://lore.kernel.org/r/[email protected]

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irq/irq_sim: Store multiple interrupt offsets in a bitmap

Two threads can try to fire the irq_sim with different offsets and will
end up fighting for the irq_work asignment. Thomas Gleixner suggeste

irq/irq_sim: Store multiple interrupt offsets in a bitmap

Two threads can try to fire the irq_sim with different offsets and will
end up fighting for the irq_work asignment. Thomas Gleixner suggested a
solution based on a bitfield where we set a bit for every offset
associated with an interrupt that should be fired and then iterate over
all set bits in the interrupt handler.

This is a slightly modified solution using a bitmap so that we don't
impose a limit on the number of interrupts one can allocate with
irq_sim.

Suggested-by: Thomas Gleixner <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>

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genirq/irq_sim: Use the SPDX license identifier in the header

Use C-style comment for the identifier as per
Documentation/process/license-rules.rst and remove the license boilerplate.

Signed-off-by

genirq/irq_sim: Use the SPDX license identifier in the header

Use C-style comment for the identifier as per
Documentation/process/license-rules.rst and remove the license boilerplate.

Signed-off-by: Bartosz Golaszewski <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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genirq/irq_sim: Add a devres variant of irq_sim_init()

Add a resource managed version of irq_sim_init(). This can be
conveniently used in device drivers.

Signed-off-by: Bartosz Golaszewski <brgl@bg

genirq/irq_sim: Add a devres variant of irq_sim_init()

Add a resource managed version of irq_sim_init(). This can be
conveniently used in device drivers.

Signed-off-by: Bartosz Golaszewski <[email protected]>
Acked-by: Jonathan Cameron <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Bamvor Jian Zhang <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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genirq/irq_sim: Add a simple interrupt simulator framework

Implement a simple, irq_work-based framework for simulating
interrupts. Currently the API exposes routines for initializing and
deinitializ

genirq/irq_sim: Add a simple interrupt simulator framework

Implement a simple, irq_work-based framework for simulating
interrupts. Currently the API exposes routines for initializing and
deinitializing the simulator object, enqueueing the interrupts and
retrieving the allocated interrupt numbers based on the offset of the
dummy interrupt in the simulator struct.

Signed-off-by: Bartosz Golaszewski <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Bamvor Jian Zhang <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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