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irqdomain: Add IRQ_DOMAIN_FLAG_MSI_IMMUTABLE and irq_domain_is_msi_immutable() 

Add the flag IRQ_DOMAIN_FLAG_MSI_IMMUTABLE and the API function
irq_domain_is_msi_immutable() to check if the MSI controller retains an
immutable address/data pair during irq_set_affinity().

Ensure compatibility with MSI users like PCIe Endpoint Doorbell, which
require the address/data pair to remain unchanged after setup. Use this
function to verify if the MSI controller is immutable.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250414-ep-msi-v18-2-f69b49917464@nxp.com
pull/1250/head
Frank Li 2025-04-14 14:30:56 -04:00 committed by Thomas Gleixner
parent 9a958e1fd4
commit b8c7bfb7a0
1 changed files with 7 additions and 0 deletions
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7
include/linux/irqdomain.h
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@ -231,6 +231,9 @@ enum {
/* Irq domain must destroy generic chips when removed */
IRQ_DOMAIN_FLAG_DESTROY_GC = (1 << 10),
/* Address and data pair is mutable when irq_set_affinity() */
IRQ_DOMAIN_FLAG_MSI_IMMUTABLE = (1 << 11),
/*
* Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
* for implementation specific purposes and ignored by the
@ -691,6 +694,10 @@ static inline bool irq_domain_is_msi_device(struct irq_domain *domain)
return domain->flags & IRQ_DOMAIN_FLAG_MSI_DEVICE;
}
static inline bool irq_domain_is_msi_immutable(struct irq_domain *domain)
{
return domain->flags & IRQ_DOMAIN_FLAG_MSI_IMMUTABLE;
}
#else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
unsigned int nr_irqs, int node, void *arg)