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irqchip/irq-msi-lib: Prepare for DEVICE MSI to replace platform MSI

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Add the prerequisites for DEVICE MSI into the shared select() and child
domain init function. These domains are really trivial and just provide a
custom irq chip callback to write the MSI message.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Shivamurthy Shastri <shivamurthy.shastri@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240623142235.085171290@linutronix.de
This commit is contained in:
Thomas Gleixner 2024-06-23 17:18:41 +02:00
parent b5712bf89b
commit 496436f4a5
2 changed files with 17 additions and 0 deletions
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15
drivers/irqchip/irq-msi-lib.c
View File

@ -56,6 +56,21 @@ bool msi_lib_init_dev_msi_info(struct device *dev, struct irq_domain *domain,
if (WARN_ON_ONCE(!IS_ENABLED(CONFIG_PCI_MSI)))
return false;
break;
case DOMAIN_BUS_DEVICE_MSI:
/*
* Per device MSI should never have any MSI feature bits
* set. It's sole purpose is to create a dumb interrupt
* chip which has a device specific irq_write_msi_msg()
* callback.
*/
if (WARN_ON_ONCE(info->flags))
return false;
/* Core managed MSI descriptors */
info->flags = MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS | MSI_FLAG_FREE_MSI_DESCS;
/* Remove PCI specific flags */
required_flags &= ~MSI_FLAG_PCI_MSI_MASK_PARENT;
break;
default:
/*

2
drivers/irqchip/irq-msi-lib.h
View File

@ -15,6 +15,8 @@
#define MATCH_PCI_MSI (0)
#endif
#define MATCH_PLATFORM_MSI BIT(DOMAIN_BUS_PLATFORM_MSI)
int msi_lib_irq_domain_select(struct irq_domain *d, struct irq_fwspec *fwspec,
enum irq_domain_bus_token bus_token);