diff options
| author | Frank Li <Frank.Li@nxp.com> | 2025-04-14 14:30:56 -0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2025-05-07 17:49:00 +0200 |
| commit | b8c7bfb7a0f01521297d688ca5fe1482c81e8910 (patch) | |
| tree | 535226a14067d7cc303b940590802313b034aa00 | |
| parent | 9a958e1fd40d6fae8c66385687a00ebd9575a7d2 (diff) | |
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
| -rw-r--r-- | include/linux/irqdomain.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index bb7111105296..bccfff5bebe2 100644 --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h @@ -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) |