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SubjectRe: [PATCH v2 3/9] irq/irq_sim: provide irq_sim_fire_type()
wt., 12 lut 2019 o 10:10 Marc Zyngier <marc.zyngier@arm.com> napisał(a):
>
> On 29/01/2019 08:44, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> >
> > Provide a more specialized variant of irq_sim_fire() that allows to
> > specify the type of the fired interrupt. The type is stored in the
> > dummy irq context struct via the set_type callback.
> >
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> > ---
> > include/linux/irq_sim.h | 9 ++++++++-
> > kernel/irq/irq_sim.c | 26 ++++++++++++++++++++++----
> > 2 files changed, 30 insertions(+), 5 deletions(-)
> >
> > diff --git a/include/linux/irq_sim.h b/include/linux/irq_sim.h
> > index b96c2f752320..647a6c8ffb31 100644
> > --- a/include/linux/irq_sim.h
> > +++ b/include/linux/irq_sim.h
> > @@ -23,6 +23,7 @@ struct irq_sim_work_ctx {
> >
> > struct irq_sim_irq_ctx {
> > bool enabled;
> > + unsigned int type;
> > };
> >
> > struct irq_sim {
> > @@ -37,7 +38,13 @@ int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs);
> > int devm_irq_sim_init(struct device *dev, struct irq_sim *sim,
> > unsigned int num_irqs);
> > void irq_sim_fini(struct irq_sim *sim);
> > -void irq_sim_fire(struct irq_sim *sim, unsigned int offset);
> > +void irq_sim_fire_type(struct irq_sim *sim,
> > + unsigned int offset, unsigned int type);
> > int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset);
> >
> > +static inline void irq_sim_fire(struct irq_sim *sim, unsigned int offset)
> > +{
> > + irq_sim_fire_type(sim, offset, IRQ_TYPE_DEFAULT);
> > +}
> > +
> > #endif /* _LINUX_IRQ_SIM_H */
> > diff --git a/kernel/irq/irq_sim.c b/kernel/irq/irq_sim.c
> > index 2bcdbab1bc5a..e3160b5e59b8 100644
> > --- a/kernel/irq/irq_sim.c
> > +++ b/kernel/irq/irq_sim.c
> > @@ -25,6 +25,15 @@ static void irq_sim_irqunmask(struct irq_data *data)
> > irq_ctx->enabled = true;
> > }
> >
> > +static int irq_sim_set_type(struct irq_data *data, unsigned int type)
> > +{
> > + struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
> > +
> > + irq_ctx->type = type;
> > +
> > + return 0;
> > +}
> > +
> > static void irq_sim_handle_irq(struct irq_work *work)
> > {
> > struct irq_sim_work_ctx *work_ctx;
> > @@ -107,6 +116,7 @@ int irq_sim_init(struct irq_sim *sim, unsigned int num_irqs)
> > sim->chip.name = "irq_sim";
> > sim->chip.irq_mask = irq_sim_irqmask;
> > sim->chip.irq_unmask = irq_sim_irqunmask;
> > + sim->chip.irq_set_type = irq_sim_set_type;
> >
> > sim->work_ctx.pending = bitmap_zalloc(num_irqs, GFP_KERNEL);
> > if (!sim->work_ctx.pending) {
> > @@ -192,21 +202,29 @@ irq_sim_get_ctx(struct irq_sim *sim, unsigned int offset)
> > }
> >
> > /**
> > - * irq_sim_fire - Enqueue an interrupt.
> > + * irq_sim_fire_type - Enqueue an interrupt.
> > *
> > * @sim: The interrupt simulator object.
> > * @offset: Offset of the simulated interrupt which should be fired.
> > + * @type: Type of the fired interrupt. Must be one of the following:
> > + * IRQ_TYPE_EDGE_RISING, IRQ_TYPE_EDGE_FALLING,
> > + * IRQ_TYPE_EDGE_BOTH, IRQ_TYPE_LEVEL_HIGH,
> > + * IRQ_TYPE_LEVEL_LOW, IRQ_TYPE_DEFAULT
> > */
> > -void irq_sim_fire(struct irq_sim *sim, unsigned int offset)
> > +void irq_sim_fire_type(struct irq_sim *sim,
> > + unsigned int offset, unsigned int type)
> > {
> > struct irq_sim_irq_ctx *ctx = irq_sim_get_ctx(sim, offset);
> >
> > - if (ctx->enabled) {
> > + /* Only care about relevant flags. */
> > + type &= IRQ_TYPE_SENSE_MASK;
> > +
> > + if (ctx->enabled && (ctx->type & type)) {
>
> I wonder how realistic this is, given that you do not track the release
> of a level. In short, mo matter what the type is, you treat everything
> as edge.
>
> What is the point of this?
>

When userspace wants to monitor GPIO line interrupts, the GPIO
framework requests a threaded interrupt with IRQF_TRIGGER_FALLING,
IRQF_TRIGGER_RISING or both. The testing module tries to act like real
hardware and so if we pass only one of the *_TRIGGER_* flags, we want
the simulated interrupt of corresponding type to be fired.

Another solution - if you don't like this one - would be to have more
specialized functions: irq_sim_fire_rising() and
irq_sim_fire_falling(). How about that?

Bart

> > set_bit(offset, sim->work_ctx.pending);
> > irq_work_queue(&sim->work_ctx.work);
> > }
> > }
> > -EXPORT_SYMBOL_GPL(irq_sim_fire);
> > +EXPORT_SYMBOL_GPL(irq_sim_fire_type);
> >
> > /**
> > * irq_sim_irqnum - Get the allocated number of a dummy interrupt.
> >
>
> Thanks,
>
> M.
> --
> Jazz is not dead. It just smells funny...

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