linux-kernel - Re: [PATCH V11 1/8] irqchip: add C-SKY SMP interrupt controller

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Date:   Fri, 12 Oct 2018 11:21:23 +0800
From:   Guo Ren <ren_guo@...ky.com>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     tglx@...utronix.de, jason@...edaemon.net, robh+dt@...nel.org,
        mark.rutland@....com, daniel.lezcano@...aro.org,
        will.deacon@....com, jhogan@...nel.org, paul.burton@...s.com,
        peterz@...radead.org, arnd@...db.de, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH V11 1/8] irqchip: add C-SKY SMP interrupt controller

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 <ren_guo@...ky.com>
> >Cc: Marc Zyngier <marc.zyngier@....com>
> 
> [...]
> 
> >+/* 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