Set the IRQ_DOMAIN_FLAG_MSI_IMMUTABLE flag for ITS, as it does not change the address/data pair after setup.
Ensure compatibility with MSI users, such as PCIe Endpoint Doorbell, which require the address/data pair to remain unchanged. Enable PCIe endpoints to use ITS for triggering doorbells from the PCIe Root Complex (RC) side.
Signed-off-by: Frank Li Frank.Li@nxp.com --- change from v13 to v12 - roll back to v12 version because Marc Zyngier have concern about add DOMAIN_BUS_DEVICE_PCI_EP_MSI. https://lore.kernel.org/imx/861pxfq315.wl-maz@kernel.org/
change from v11 to v12 - new patch --- drivers/irqchip/irq-gic-v3-its.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 8c3ec5734f1ef..7c0a97a1bf8be 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -5126,7 +5126,7 @@ static int its_init_domain(struct its_node *its) irq_domain_update_bus_token(inner_domain, DOMAIN_BUS_NEXUS);
inner_domain->msi_parent_ops = &gic_v3_its_msi_parent_ops; - inner_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT; + inner_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT | IRQ_DOMAIN_FLAG_MSI_IMMUTABLE;
return 0; }