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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 <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>
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@ -16,11 +16,28 @@
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* requested like normal irqs and enqueued from process context.
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*/
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struct irq_sim_ops {
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int (*irq_sim_irq_requested)(struct irq_domain *domain,
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irq_hw_number_t hwirq, void *data);
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void (*irq_sim_irq_released)(struct irq_domain *domain,
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irq_hw_number_t hwirq, void *data);
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};
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struct irq_domain *irq_domain_create_sim(struct fwnode_handle *fwnode,
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unsigned int num_irqs);
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struct irq_domain *devm_irq_domain_create_sim(struct device *dev,
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struct fwnode_handle *fwnode,
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unsigned int num_irqs);
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struct irq_domain *irq_domain_create_sim_full(struct fwnode_handle *fwnode,
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unsigned int num_irqs,
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const struct irq_sim_ops *ops,
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void *data);
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struct irq_domain *
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devm_irq_domain_create_sim_full(struct device *dev,
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struct fwnode_handle *fwnode,
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unsigned int num_irqs,
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const struct irq_sim_ops *ops,
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void *data);
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void irq_domain_remove_sim(struct irq_domain *domain);
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#endif /* _LINUX_IRQ_SIM_H */
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@ -17,6 +17,8 @@ struct irq_sim_work_ctx {
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unsigned int irq_count;
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unsigned long *pending;
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struct irq_domain *domain;
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struct irq_sim_ops ops;
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void *user_data;
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};
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struct irq_sim_irq_ctx {
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@ -88,6 +90,31 @@ static int irq_sim_set_irqchip_state(struct irq_data *data,
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return 0;
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}
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static int irq_sim_request_resources(struct irq_data *data)
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{
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struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
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struct irq_sim_work_ctx *work_ctx = irq_ctx->work_ctx;
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irq_hw_number_t hwirq = irqd_to_hwirq(data);
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if (work_ctx->ops.irq_sim_irq_requested)
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return work_ctx->ops.irq_sim_irq_requested(work_ctx->domain,
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hwirq,
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work_ctx->user_data);
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return 0;
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}
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static void irq_sim_release_resources(struct irq_data *data)
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{
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struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
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struct irq_sim_work_ctx *work_ctx = irq_ctx->work_ctx;
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irq_hw_number_t hwirq = irqd_to_hwirq(data);
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if (work_ctx->ops.irq_sim_irq_released)
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work_ctx->ops.irq_sim_irq_released(work_ctx->domain, hwirq,
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work_ctx->user_data);
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}
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static struct irq_chip irq_sim_irqchip = {
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.name = "irq_sim",
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.irq_mask = irq_sim_irqmask,
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@ -95,6 +122,8 @@ static struct irq_chip irq_sim_irqchip = {
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.irq_set_type = irq_sim_set_type,
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.irq_get_irqchip_state = irq_sim_get_irqchip_state,
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.irq_set_irqchip_state = irq_sim_set_irqchip_state,
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.irq_request_resources = irq_sim_request_resources,
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.irq_release_resources = irq_sim_release_resources,
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};
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static void irq_sim_handle_irq(struct irq_work *work)
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@ -163,6 +192,15 @@ static const struct irq_domain_ops irq_sim_domain_ops = {
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*/
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struct irq_domain *irq_domain_create_sim(struct fwnode_handle *fwnode,
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unsigned int num_irqs)
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{
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return irq_domain_create_sim_full(fwnode, num_irqs, NULL, NULL);
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}
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EXPORT_SYMBOL_GPL(irq_domain_create_sim);
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struct irq_domain *irq_domain_create_sim_full(struct fwnode_handle *fwnode,
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unsigned int num_irqs,
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const struct irq_sim_ops *ops,
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void *data)
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{
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struct irq_sim_work_ctx *work_ctx __free(kfree) =
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kmalloc(sizeof(*work_ctx), GFP_KERNEL);
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@ -183,10 +221,14 @@ struct irq_domain *irq_domain_create_sim(struct fwnode_handle *fwnode,
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work_ctx->irq_count = num_irqs;
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work_ctx->work = IRQ_WORK_INIT_HARD(irq_sim_handle_irq);
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work_ctx->pending = no_free_ptr(pending);
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work_ctx->user_data = data;
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if (ops)
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memcpy(&work_ctx->ops, ops, sizeof(*ops));
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return no_free_ptr(work_ctx)->domain;
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}
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EXPORT_SYMBOL_GPL(irq_domain_create_sim);
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EXPORT_SYMBOL_GPL(irq_domain_create_sim_full);
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/**
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* irq_domain_remove_sim - Deinitialize the interrupt simulator domain: free
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@ -227,11 +269,23 @@ static void devm_irq_domain_remove_sim(void *data)
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struct irq_domain *devm_irq_domain_create_sim(struct device *dev,
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struct fwnode_handle *fwnode,
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unsigned int num_irqs)
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{
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return devm_irq_domain_create_sim_full(dev, fwnode, num_irqs,
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NULL, NULL);
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}
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EXPORT_SYMBOL_GPL(devm_irq_domain_create_sim);
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struct irq_domain *
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devm_irq_domain_create_sim_full(struct device *dev,
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struct fwnode_handle *fwnode,
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unsigned int num_irqs,
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const struct irq_sim_ops *ops,
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void *data)
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{
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struct irq_domain *domain;
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int ret;
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domain = irq_domain_create_sim(fwnode, num_irqs);
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domain = irq_domain_create_sim_full(fwnode, num_irqs, ops, data);
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if (IS_ERR(domain))
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return domain;
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@ -241,4 +295,4 @@ struct irq_domain *devm_irq_domain_create_sim(struct device *dev,
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return domain;
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}
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EXPORT_SYMBOL_GPL(devm_irq_domain_create_sim);
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EXPORT_SYMBOL_GPL(devm_irq_domain_create_sim_full);
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