[PATCH v3 07/19] iommu/riscv: Add IRQ domain for interrupt remapping

[Thomas Gleixner]

On Fri, Aug 07 2026 at 22:32, Thomas Gleixner wrote:
> On Fri, Aug 07 2026 at 20:17, Andrew Jones wrote:
>> +static int riscv_iommu_ir_irq_domain_alloc_irqs(struct irq_domain *irqdomain,
>> +						unsigned int irq_base, unsigned int nr_irqs,
>> +						void *arg)
>> +{
>> +	struct irq_data *data;
>> +	int i, ret;
>> +
>> +	ret = irq_domain_alloc_irqs_parent(irqdomain, irq_base, nr_irqs, arg);
>> +	if (ret)
>> +		return ret;
>> +
>> +	for (i = 0; i < nr_irqs; i++) {
>
> for (unsigned int i = 0; .....
>
> nr_irqs is unsigned after all
>
> The struct irq_data declaration want's to be inside the loop as that's
> the scope where it is used.
>
>> +		data = irq_domain_get_irq_data(irqdomain, irq_base + i);
>
>
>> +		data->chip = &riscv_iommu_ir_irq_chip;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct irq_domain_ops riscv_iommu_ir_irq_domain_ops = {
>> +	.alloc = riscv_iommu_ir_irq_domain_alloc_irqs,
>> +	.free = irq_domain_free_irqs_parent,
>
> https://docs.kernel.org/process/maintainer-tip.html#struct-declarations-and-initializers
>
>> +};
>> +
>> +static const struct msi_parent_ops riscv_iommu_ir_msi_parent_ops = {
>> +	.prefix			= "IR-",
>> +	.supported_flags	= MSI_GENERIC_FLAGS_MASK |
>> +				  MSI_FLAG_PCI_MSIX,
>> +	.required_flags		= MSI_FLAG_USE_DEF_DOM_OPS |
>> +				  MSI_FLAG_USE_DEF_CHIP_OPS |
>> +				  MSI_FLAG_PCI_MSI_MASK_PARENT,
>> +	.chip_flags		= MSI_CHIP_FLAG_SET_ACK,
>> +	.init_dev_msi_info	= msi_parent_init_dev_msi_info,
>> +};
>> +
>> +struct irq_domain *riscv_iommu_ir_irq_domain_create(struct device *dev,
>> +						    struct riscv_iommu_info *info)
>
> You have 100 characters, please use them.

Oops. Just noticed, that this is IOMMU territory. So whatever the IOMMU
maintainers prefer :)