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powerpc/xive: Introduce an IPI interrupt domain 

The IPI interrupt is a special case of the XIVE IRQ domain. When
mapping and unmapping the interrupts in the Linux interrupt number
space, the HW interrupt number 0 (XIVE_IPI_HW_IRQ) is checked to
distinguish the IPI interrupt from other interrupts of the system.

Simplify the XIVE interrupt domain by introducing a specific domain
for the IPI.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210331144514.892250-3-clg@kaod.org
This commit is contained in:
Cédric Le Goater 2021-03-31 16:45:07 +02:00 committed by Michael Ellerman
parent 078277acbd
commit 7d34849413
1 changed files with 47 additions and 34 deletions
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81
arch/powerpc/sysdev/xive/common.c
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@ -1067,24 +1067,58 @@ static struct irq_chip xive_ipi_chip = {
.irq_unmask = xive_ipi_do_nothing,
};
static void __init xive_request_ipi(void)
/*
* 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)
{
unsigned int virq;
irq_set_chip_and_handler(virq, &xive_ipi_chip, handle_percpu_irq);
return 0;
}
/*
* Initialization failed, move on, we might manage to
* reach the point where we display our errors before
* the system falls appart
*/
if (!xive_irq_domain)
return;
static const struct irq_domain_ops xive_ipi_irq_domain_ops = {
.map = xive_ipi_irq_domain_map,
};
static int __init xive_request_ipi(void)
{
struct fwnode_handle *fwnode;
struct irq_domain *ipi_domain;
unsigned int virq;
int ret = -ENOMEM;
fwnode = irq_domain_alloc_named_fwnode("XIVE-IPI");
if (!fwnode)
goto out;
ipi_domain = irq_domain_create_linear(fwnode, 1,
&xive_ipi_irq_domain_ops, NULL);
if (!ipi_domain)
goto out_free_fwnode;
/* Initialize it */
virq = irq_create_mapping(xive_irq_domain, XIVE_IPI_HW_IRQ);
virq = irq_create_mapping(ipi_domain, XIVE_IPI_HW_IRQ);
if (!virq) {
ret = -EINVAL;
goto out_free_domain;
}
xive_ipi_irq = virq;
WARN_ON(request_irq(virq, xive_muxed_ipi_action,
IRQF_PERCPU | IRQF_NO_THREAD, "IPI", NULL));
ret = request_irq(virq, xive_muxed_ipi_action,
IRQF_PERCPU | IRQF_NO_THREAD, "IPI", NULL);
WARN(ret < 0, "Failed to request IPI %d: %d\n", virq, ret);
return ret;
out_free_domain:
irq_domain_remove(ipi_domain);
out_free_fwnode:
irq_domain_free_fwnode(fwnode);
out:
return ret;
}
static int xive_setup_cpu_ipi(unsigned int cpu)
@ -1178,19 +1212,6 @@ static int xive_irq_domain_map(struct irq_domain *h, unsigned int virq,
*/
irq_clear_status_flags(virq, IRQ_LEVEL);
#ifdef CONFIG_SMP
/* IPIs are special and come up with HW number 0 */
if (hw == XIVE_IPI_HW_IRQ) {
/*
* IPIs are marked per-cpu. We use separate HW interrupts under
* the hood but associated with the same "linux" interrupt
*/
irq_set_chip_and_handler(virq, &xive_ipi_chip,
handle_percpu_irq);
return 0;
}
#endif
rc = xive_irq_alloc_data(virq, hw);
if (rc)
return rc;
@ -1202,15 +1223,7 @@ static int xive_irq_domain_map(struct irq_domain *h, unsigned int virq,
static void xive_irq_domain_unmap(struct irq_domain *d, unsigned int virq)
{
struct irq_data *data = irq_get_irq_data(virq);
unsigned int hw_irq;
/* XXX Assign BAD number */
if (!data)
return;
hw_irq = (unsigned int)irqd_to_hwirq(data);
if (hw_irq != XIVE_IPI_HW_IRQ)
xive_irq_free_data(virq);
xive_irq_free_data(virq);
}
static int xive_irq_domain_xlate(struct irq_domain *h, struct device_node *ct,