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genirq/irq_sim: add an extended irq_sim initializer

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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 <linus.walleij@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240624093934.17089-2-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2024-06-24 11:39:32 +02:00
parent f2e3956297
commit 011f583781
2 changed files with 74 additions and 3 deletions
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17
include/linux/irq_sim.h
View File

@ -16,11 +16,28 @@
* requested like normal irqs and enqueued from process context.
*/
struct irq_sim_ops {
int (*irq_sim_irq_requested)(struct irq_domain *domain,
irq_hw_number_t hwirq, void *data);
void (*irq_sim_irq_released)(struct irq_domain *domain,
irq_hw_number_t hwirq, void *data);
};
struct irq_domain *irq_domain_create_sim(struct fwnode_handle *fwnode,
unsigned int num_irqs);
struct irq_domain *devm_irq_domain_create_sim(struct device *dev,
struct fwnode_handle *fwnode,
unsigned int num_irqs);
struct irq_domain *irq_domain_create_sim_full(struct fwnode_handle *fwnode,
unsigned int num_irqs,
const struct irq_sim_ops *ops,
void *data);
struct irq_domain *
devm_irq_domain_create_sim_full(struct device *dev,
struct fwnode_handle *fwnode,
unsigned int num_irqs,
const struct irq_sim_ops *ops,
void *data);
void irq_domain_remove_sim(struct irq_domain *domain);
#endif /* _LINUX_IRQ_SIM_H */

60
kernel/irq/irq_sim.c
View File

@ -17,6 +17,8 @@ struct irq_sim_work_ctx {
unsigned int irq_count;
unsigned long *pending;
struct irq_domain *domain;
struct irq_sim_ops ops;
void *user_data;
};
struct irq_sim_irq_ctx {
@ -88,6 +90,31 @@ static int irq_sim_set_irqchip_state(struct irq_data *data,
return 0;
}
static int irq_sim_request_resources(struct irq_data *data)
{
struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
struct irq_sim_work_ctx *work_ctx = irq_ctx->work_ctx;
irq_hw_number_t hwirq = irqd_to_hwirq(data);
if (work_ctx->ops.irq_sim_irq_requested)
return work_ctx->ops.irq_sim_irq_requested(work_ctx->domain,
hwirq,
work_ctx->user_data);
return 0;
}
static void irq_sim_release_resources(struct irq_data *data)
{
struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
struct irq_sim_work_ctx *work_ctx = irq_ctx->work_ctx;
irq_hw_number_t hwirq = irqd_to_hwirq(data);
if (work_ctx->ops.irq_sim_irq_released)
work_ctx->ops.irq_sim_irq_released(work_ctx->domain, hwirq,
work_ctx->user_data);
}
static struct irq_chip irq_sim_irqchip = {
.name = "irq_sim",
.irq_mask = irq_sim_irqmask,
@ -95,6 +122,8 @@ static struct irq_chip irq_sim_irqchip = {
.irq_set_type = irq_sim_set_type,
.irq_get_irqchip_state = irq_sim_get_irqchip_state,
.irq_set_irqchip_state = irq_sim_set_irqchip_state,
.irq_request_resources = irq_sim_request_resources,
.irq_release_resources = irq_sim_release_resources,
};
static void irq_sim_handle_irq(struct irq_work *work)
@ -163,6 +192,15 @@ static const struct irq_domain_ops irq_sim_domain_ops = {
*/
struct irq_domain *irq_domain_create_sim(struct fwnode_handle *fwnode,
unsigned int num_irqs)
{
return irq_domain_create_sim_full(fwnode, num_irqs, NULL, NULL);
}
EXPORT_SYMBOL_GPL(irq_domain_create_sim);
struct irq_domain *irq_domain_create_sim_full(struct fwnode_handle *fwnode,
unsigned int num_irqs,
const struct irq_sim_ops *ops,
void *data)
{
struct irq_sim_work_ctx *work_ctx __free(kfree) =
kmalloc(sizeof(*work_ctx), GFP_KERNEL);
@ -183,10 +221,14 @@ struct irq_domain *irq_domain_create_sim(struct fwnode_handle *fwnode,
work_ctx->irq_count = num_irqs;
work_ctx->work = IRQ_WORK_INIT_HARD(irq_sim_handle_irq);
work_ctx->pending = no_free_ptr(pending);
work_ctx->user_data = data;
if (ops)
memcpy(&work_ctx->ops, ops, sizeof(*ops));
return no_free_ptr(work_ctx)->domain;
}
EXPORT_SYMBOL_GPL(irq_domain_create_sim);
EXPORT_SYMBOL_GPL(irq_domain_create_sim_full);
/**
* irq_domain_remove_sim - Deinitialize the interrupt simulator domain: free
@ -227,11 +269,23 @@ static void devm_irq_domain_remove_sim(void *data)
struct irq_domain *devm_irq_domain_create_sim(struct device *dev,
struct fwnode_handle *fwnode,
unsigned int num_irqs)
{
return devm_irq_domain_create_sim_full(dev, fwnode, num_irqs,
NULL, NULL);
}
EXPORT_SYMBOL_GPL(devm_irq_domain_create_sim);
struct irq_domain *
devm_irq_domain_create_sim_full(struct device *dev,
struct fwnode_handle *fwnode,
unsigned int num_irqs,
const struct irq_sim_ops *ops,
void *data)
{
struct irq_domain *domain;
int ret;
domain = irq_domain_create_sim(fwnode, num_irqs);
domain = irq_domain_create_sim_full(fwnode, num_irqs, ops, data);
if (IS_ERR(domain))
return domain;
@ -241,4 +295,4 @@ struct irq_domain *devm_irq_domain_create_sim(struct device *dev,
return domain;
}
EXPORT_SYMBOL_GPL(devm_irq_domain_create_sim);
EXPORT_SYMBOL_GPL(devm_irq_domain_create_sim_full);