/**
* acpi_irq_get - Lookup an ACPI IRQ resource and use it to initialize resource.
* @handle: ACPI device handle
* @index: ACPI IRQ resource index to lookup
* @res: Linux IRQ resource to initialize
*
* Description:
* Look for the ACPI IRQ resource with the given index and use it to initialize
* the given Linux IRQ resource.
*
* Return:
* 0 on success
* -EINVAL if an error occurs
* -EPROBE_DEFER if the IRQ lookup/conversion failed
*/
int acpi_irq_get(acpi_handle handle, unsigned int index, struct resource *res)
{
struct irq_fwspec fwspec;
struct irq_domain *domain;
unsigned long flags;
int rc;
rc = acpi_irq_parse_one(handle, index, &fwspec, &flags);
if (rc)
return rc;
domain = irq_find_matching_fwnode(fwspec.fwnode, DOMAIN_BUS_ANY);
if (!domain)
return -EPROBE_DEFER;
rc = irq_create_fwspec_mapping(&fwspec);
if (rc <= 0)
return -EINVAL;
res->start = rc;
res->end = rc;
res->flags = flags;
return 0;
}
/**
* acpi_unregister_gsi() - Free a GSI<->linux IRQ number mapping
* @gsi: GSI IRQ number
*/
void acpi_unregister_gsi(u32 gsi)
{
struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
DOMAIN_BUS_ANY);
int irq = irq_find_mapping(d, gsi);
irq_dispose_mapping(irq);
}
/**
* acpi_gsi_to_irq() - Retrieve the linux irq number for a given GSI
* @gsi: GSI IRQ number to map
* @irq: pointer where linux IRQ number is stored
*
* irq location updated with irq value [>0 on success, 0 on failure]
*
* Returns: 0 on success
* -EINVAL on failure
*/
int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
{
struct irq_domain *d = irq_find_matching_fwnode(acpi_gsi_domain_id,
DOMAIN_BUS_ANY);
*irq = irq_find_mapping(d, gsi);
/*
* *irq == 0 means no mapping, that should
* be reported as a failure
*/
return (*irq > 0) ? 0 : -EINVAL;
}
static int __init its_pci_msi_init_one(struct fwnode_handle *handle,
const char *name)
{
struct irq_domain *parent;
parent = irq_find_matching_fwnode(handle, DOMAIN_BUS_NEXUS);
if (!parent || !msi_get_domain_info(parent)) {
pr_err("%s: Unable to locate ITS domain\n", name);
return -ENXIO;
}
if (!pci_msi_create_irq_domain(handle, &its_pci_msi_domain_info,
parent)) {
pr_err("%s: Unable to create PCI domain\n", name);
return -ENOMEM;
}
return 0;
}
