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irqchip/gic-v5: Allocate ITS parent LPIs as a range

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The ITS MSI domain no longer manages LPI allocation directly. LPIs are
allocated and freed by the parent LPI domain, which can now handle a
full range of interrupts and unwind partial allocations internally.

Make the ITS domain request and release the parent IRQs as a single
range instead of iterating over each interrupt. The ITS allocation
path then only needs to reserve EventIDs, allocate the parent range,
and fill in the ITS irq_data for each MSI. Since no operation in the
per-MSI loop can fail, the partial parent-free unwind becomes
unnecessary.

On teardown, reset the ITS irq_data for the range and then release the
parent range in one call, leaving LPI teardown to the LPI domain.

Fixes: 0f01013258 ("irqchip/gic-v5: Add GICv5 LPI/IPI support")
Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260506093634.382062-4-sascha.bischoff@arm.com
This commit is contained in:
Sascha Bischoff 2026-05-06 09:37:43 +00:00 committed by Thomas Gleixner
parent eb6f6d5238
commit a7c7e42654
1 changed files with 7 additions and 15 deletions
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22
drivers/irqchip/irq-gic-v5-its.c
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@ -937,6 +937,7 @@ static int gicv5_its_irq_domain_alloc(struct irq_domain *domain, unsigned int vi
int ret, i;
its_dev = info->scratchpad[0].ptr;
device_id = its_dev->device_id;
ret = gicv5_its_alloc_eventid(its_dev, info, nr_irqs, &event_id_base);
if (ret)
@ -946,14 +947,11 @@ static int gicv5_its_irq_domain_alloc(struct irq_domain *domain, unsigned int vi
if (ret)
goto out_eventid;
device_id = its_dev->device_id;
ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, NULL);
if (ret)
goto out_eventid;
for (i = 0; i < nr_irqs; i++) {
ret = irq_domain_alloc_irqs_parent(domain, virq + i, 1, NULL);
if (ret) {
goto out_free_irqs;
}
/*
* Store eventid and deviceid into the hwirq for later use.
*
@ -972,12 +970,6 @@ static int gicv5_its_irq_domain_alloc(struct irq_domain *domain, unsigned int vi
return 0;
out_free_irqs:
while (--i >= 0) {
irqd = irq_domain_get_irq_data(domain, virq + i);
irq_domain_reset_irq_data(irqd);
irq_domain_free_irqs_parent(domain, virq + i, 1);
}
out_eventid:
gicv5_its_free_eventid(its_dev, event_id_base, nr_irqs);
return ret;
@ -1000,14 +992,14 @@ static void gicv5_its_irq_domain_free(struct irq_domain *domain, unsigned int vi
bitmap_release_region(its_dev->event_map, event_id_base,
get_count_order(nr_irqs));
/* Hierarchically free irq data */
for (i = 0; i < nr_irqs; i++) {
d = irq_domain_get_irq_data(domain, virq + i);
irq_domain_reset_irq_data(d);
irq_domain_free_irqs_parent(domain, virq + i, 1);
}
/* Hierarchically free irq data */
irq_domain_free_irqs_parent(domain, virq, nr_irqs);
gicv5_its_syncr(its, its_dev);
gicv5_irs_syncr();
}