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powerpc/xive: Modernize XIVE-IPI domain with an 'alloc' handler

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Instead of calling irq_create_mapping() to map the IPI for a node,
introduce an 'alloc' handler. This is usually an extension to support
hierarchy irq_domains which is not exactly the case for XIVE-IPI
domain. However, we can now use the irq_domain_alloc_irqs() routine
which allocates the IRQ descriptor on the specified node, even better
for cache performance on multi node machines.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210331144514.892250-10-clg@kaod.org
This commit is contained in:
Cédric Le Goater 2021-03-31 16:45:14 +02:00 committed by Michael Ellerman
parent 7dcc37b3ef
commit fd6db2892e
1 changed files with 19 additions and 8 deletions
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27
arch/powerpc/sysdev/xive/common.c
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@ -1102,15 +1102,26 @@ static struct irq_chip xive_ipi_chip = {
* IPIs are marked per-cpu. We use separate HW interrupts under the
* hood but associated with the same "linux" interrupt
*/
static int xive_ipi_irq_domain_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
struct xive_ipi_alloc_info {
irq_hw_number_t hwirq;
};
static int xive_ipi_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
irq_set_chip_and_handler(virq, &xive_ipi_chip, handle_percpu_irq);
struct xive_ipi_alloc_info *info = arg;
int i;
for (i = 0; i < nr_irqs; i++) {
irq_domain_set_info(domain, virq + i, info->hwirq + i, &xive_ipi_chip,
domain->host_data, handle_percpu_irq,
NULL, NULL);
}
return 0;
}
static const struct irq_domain_ops xive_ipi_irq_domain_ops = {
.map = xive_ipi_irq_domain_map,
.alloc = xive_ipi_irq_domain_alloc,
};
static int __init xive_request_ipi(void)
@ -1135,7 +1146,7 @@ static int __init xive_request_ipi(void)
for_each_node(node) {
struct xive_ipi_desc *xid = &xive_ipis[node];
irq_hw_number_t ipi_hwirq = node;
struct xive_ipi_alloc_info info = { node };
/* Skip nodes without CPUs */
if (cpumask_empty(cpumask_of_node(node)))
@ -1146,9 +1157,9 @@ static int __init xive_request_ipi(void)
* Since the HW interrupt number doesn't have any meaning,
* simply use the node number.
*/
xid->irq = irq_create_mapping(ipi_domain, ipi_hwirq);
if (!xid->irq) {
ret = -EINVAL;
xid->irq = irq_domain_alloc_irqs(ipi_domain, 1, node, &info);
if (xid->irq < 0) {
ret = xid->irq;
goto out_free_xive_ipis;
}