[patch 05/10] genirq/msi: Add domain info flag MSI_FLAG_CAN_EXPAND

Thomas Gleixner
2021-11-27T02:18:43Z

Not all MSI domains support runtime expansions of PCI/MSI-X vectors. Add a
domain flag so implementations can opt in.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/msi.h | 2 ++
1 file changed, 2 insertions(+)

--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -494,6 +494,8 @@ enum {
MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS = (1 << 9),
/* Free MSI descriptors */
MSI_FLAG_FREE_MSI_DESCS = (1 << 10),
+ /* MSI vectors can be expanded after initial setup */
+ MSI_FLAG_CAN_EXPAND = (1 << 11),
};

int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,