Hi Marc,
On Tue, Oct 09, 2018 at 04:11:05PM +0100, Marc Zyngier wrote:
> On 09/10/18 15:41, Guo Ren wrote:
> > - Irq-csky-mpintc is C-SKY smp system interrupt controller and it
> >could support 16 soft irqs, 16 private irqs, and 992 max common
> >irqs.
> >
> >Changelog:
> > - Convert the cpumask to an interrupt-controller specific representation
> >in driver's code, and not the SMP code's.
> > - pass checkpatch.pl
> > - Move IPI_IRQ into the driver
> > - Remove irq_set_default_host() and use set_ipi_irq_mapping()
> > - Change name with upstream feed-back
> > - Change irq map, reserve soft_irq & private_irq space
> > - Add License and Copyright
> > - Support set_affinity for irq balance in SMP
> >
> >Signed-off-by: Guo Ren
> >Cc: Marc Zyngier
>
> [...]
>
> >+/* C-SKY multi processor interrupt controller */
> >+static int __init
> >+csky_mpintc_init(struct device_node *node, struct device_node *parent)
> >+{
> >+unsigned int cpu, nr_irq;
> >+int ret;
> >+
> >+if (parent)
> >+return 0;
> >+
> >+ret = of_property_read_u32(node, "csky,num-irqs", &nr_irq);
> >+if (ret < 0)
> >+nr_irq = INTC_IRQS;
> >+
> >+if (INTCG_base == NULL) {
> >+INTCG_base = ioremap(mfcr("cr<31, 14>"),
> >+ INTCL_SIZE*nr_cpu_ids + INTCG_SIZE);
> >+if (INTCG_base == NULL)
> >+return -EIO;
> >+
> >+INTCL_base = INTCG_base + INTCG_SIZE;
> >+
> >+writel_relaxed(BIT(0), INTCG_base + INTCG_ICTLR);
> >+}
> >+
> >+root_domain = irq_domain_add_linear(node, nr_irq, &csky_irqdomain_ops,
> >+NULL);
> >+if (!root_domain)
> >+return -ENXIO;
> >+
> >+/* for every cpu */
> >+for_each_present_cpu(cpu) {
> >+per_cpu(intcl_reg, cpu) = INTCL_base + (INTCL_SIZE * cpu);
> >+writel_relaxed(BIT(0), per_cpu(intcl_reg, cpu) + INTCL_PICTLR);
> >+}
> >+
> >+set_handle_irq(&csky_mpintc_handler);
> >+
> >+#ifdef CONFIG_SMP
> >+set_send_ipi(&csky_mpintc_send_ipi);
> >+
> >+set_ipi_irq_mapping(&csky_mpintc_ipi_irq_mapping);
>
> Same remark as before.
>
> You do not need this second callback, and you should redefine set_send_ipi
> to take an irq number:
>
> ipi_irq = irq_create_mapping(root_domain, IPI_IRQ);
> if (!ipi_irq)
> [handle error]
>
> set_send_ipi(csky_mpintc_send_ipi, ipi_irq);
>
> and you can then delete both set_ipi_irq_mapping and csky_mpintc_handler,
> none of which serve any purpose.
>
> In your SMP code:
>
> void __init set_send_ipi(void (*func)(const struct cpumask *), int irq)
> {
> if (send_arch_ipi)
> return;
>
> send_arch_ipi = func;
> ipi_irq = irq;
> }
>
> and simplify setup_smp_ipi.
Ok, remove the set_ipi_irq_mapping. See my next version patch.
Best Regards
Guo Ren
