Commit e49312fe authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

genirq/irqdomain: Reroute device MSI create_mapping 



Reroute interrupt allocation in irq_create_fwspec_mapping() if the domain
is a MSI device domain. This is required to convert the support for wire
to MSI bridges to per device MSI domains.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarAnup Patel <apatel@ventanamicro.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240127161753.114685-13-apatel@ventanamicro.com
parent 0ee1578b

kernel/irq/irqdomain.c

+20 −6
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base, 
					unsigned int nr_irqs, int node, void *arg,

					bool realloc, const struct irq_affinity_desc *affinity);

static void irq_domain_check_hierarchy(struct irq_domain *domain);

static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq);



struct irqchip_fwid {

	struct fwnode_handle	fwnode;
@@ -858,6 +859,11 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec) 
	}



	if (irq_domain_is_hierarchy(domain)) {

		if (irq_domain_is_msi_device(domain)) {

			mutex_unlock(&domain->root->mutex);

			virq = msi_device_domain_alloc_wired(domain, hwirq, type);

			mutex_lock(&domain->root->mutex);

		} else

			virq = irq_domain_alloc_irqs_locked(domain, -1, 1, NUMA_NO_NODE,

							    fwspec, false, NULL);

		if (virq <= 0) {
@@ -914,7 +920,7 @@ void irq_dispose_mapping(unsigned int virq) 
		return;



	if (irq_domain_is_hierarchy(domain)) {

		irq_domain_free_irqs(virq, 1);

		irq_domain_free_one_irq(domain, virq);

	} else {

		irq_domain_disassociate(domain, virq);

		irq_free_desc(virq);
@@ -1755,6 +1761,14 @@ void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs) 
	irq_free_descs(virq, nr_irqs);

}



static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq)

{

	if (irq_domain_is_msi_device(domain))

		msi_device_domain_free_wired(domain, virq);

	else

		irq_domain_free_irqs(virq, 1);

}



/**

 * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain

 * @domain:	Domain below which interrupts must be allocated
@@ -1907,9 +1921,9 @@ static int irq_domain_alloc_irqs_locked(struct irq_domain *domain, int irq_base, 
	return -EINVAL;

}



static void irq_domain_check_hierarchy(struct irq_domain *domain)

{

}

static void irq_domain_check_hierarchy(struct irq_domain *domain) { }

static void irq_domain_free_one_irq(struct irq_domain *domain, unsigned int virq) { }



#endif	/* CONFIG_IRQ_DOMAIN_HIERARCHY */



#ifdef CONFIG_GENERIC_IRQ_DEBUGFS