[PATCH v5 0/2] irq/irq_sim: improve the API

From: Bartosz Golaszewski
Date: Thu May 14 2020 - 04:39:08 EST


From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>

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 series tries to address it.

First, we make irq_domain_reset_irq_data() available to non-V2 domain API
users - that'll be used in the subsequent patch. Next we overhaul the
public interfaces - we hide all specific data structures and instead
rely on the irq_domain struct and virtual interrupt numberspace.

The end effect is that we limit the interrupt simulator API to two
functions (plus one device managed variant) and zero new structures.

v1: https://lkml.org/lkml/2019/8/12/558

v1 -> v2:
- instead of just making the new data structures opaque for users, remove
them entirely in favor of irq_domain
- call irq_set_handler() & irq_domain_reset_irq_data() when unmapping
the simulated interrupt
- fix a memory leak in error path
- make it possible to use irq_find_matching_fwnode() with the simulator
domain
- correctly use irq_create_mapping() and irq_find_mapping(): only use the
former at init-time and the latter at interrupt-time

v2 -> v3:
- drop the controverial changes to irq_domain code and only leave the
changes to irq_sim and its users with the plan to revisit the former
at a later time

v3 -> v4:
- add the Ack from Jonathan
- remove redundant parts of patch 1/2

v4 -> v5:
- add the review tags from Linus
- use the irq_set_irqchip_state interface and drop irq_sim_fire() entirely
as suggested by Marc

Bartosz Golaszewski (2):
irq: make irq_domain_reset_irq_data() available even for non-V2 users
irq/irq_sim: simplify the API

drivers/gpio/gpio-mockup.c | 53 ++++--
drivers/iio/dummy/iio_dummy_evgen.c | 34 ++--
include/linux/irq_sim.h | 33 +---
include/linux/irqdomain.h | 2 +-
kernel/irq/Kconfig | 1 +
kernel/irq/irq_sim.c | 267 +++++++++++++++++-----------
kernel/irq/irqdomain.c | 24 +--
7 files changed, 250 insertions(+), 164 deletions(-)

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2.25.0