Re: [PATCH v4 03/13] irqchip/riscv-intc: Introduce Andes hart-level interrupt controller

[Yu-Chien Peter Lin <peterlin@andestech.com>]

Hi Thomas,

On Fri, Dec 08, 2023 at 05:01:36PM +0100, Thomas Gleixner wrote:
> On Wed, Nov 22 2023 at 20:12, Yu Chien Peter Lin wrote:
> > To share the riscv_intc_domain_map() with the generic RISC-V INTC and
> > ACPI, we add a chip parameter to riscv_intc_init_common(), so it can be
> 
> s/we//
> 
> See: Documentation/process/
> 
> > passed to the irq_domain_set_info() as private data.
> > diff --git a/drivers/irqchip/irq-riscv-intc.c b/drivers/irqchip/irq-riscv-intc.c
> > index 2fdd40f2a791..30f0036c8978 100644
> > --- a/drivers/irqchip/irq-riscv-intc.c
> > +++ b/drivers/irqchip/irq-riscv-intc.c
> > @@ -17,6 +17,7 @@
> >  #include <linux/module.h>
> >  #include <linux/of.h>
> >  #include <linux/smp.h>
> > +#include <linux/soc/andes/irq.h>
> >  
> >  static struct irq_domain *intc_domain;
> >  
> > @@ -46,6 +47,31 @@ static void riscv_intc_irq_unmask(struct irq_data *d)
> >  	csr_set(CSR_IE, BIT(d->hwirq));
> >  }
> >  
> > +static void andes_intc_irq_mask(struct irq_data *d)
> > +{
> > +	/*
> > +	 * Andes specific S-mode local interrupt causes (hwirq)
> > +	 * are defined as (256 + n) and controlled by n-th bit
> > +	 * of SLIE.
> > +	 */
> > +	unsigned int mask = BIT(d->hwirq % BITS_PER_LONG);
> 
> How is this supposed to be correct with BITS_PER_LONG == 64?

Yes, I should subtract ANDES_SLI_CAUSE_BASE directly here.

> > +
> > +	if (d->hwirq < ANDES_SLI_CAUSE_BASE)
> > +		csr_clear(CSR_IE, mask);
> > +	else
> > +		csr_clear(ANDES_CSR_SLIE, mask);
> > +}
> > +
> > +static void andes_intc_irq_unmask(struct irq_data *d)
> > +{
> > +	unsigned int mask = BIT(d->hwirq % BITS_PER_LONG);
> 
> Ditto.
> 
> > +	if (d->hwirq < ANDES_SLI_CAUSE_BASE)
> > +		csr_set(CSR_IE, mask);
> > +	else
> > +		csr_set(ANDES_CSR_SLIE, mask);
> > +}
> 
> >  static int riscv_intc_domain_map(struct irq_domain *d, unsigned int irq,
> >  				 irq_hw_number_t hwirq)
> >  {
> > +	struct irq_chip *chip = d->host_data;
> > +
> >  	irq_set_percpu_devid(irq);
> > -	irq_domain_set_info(d, irq, hwirq, &riscv_intc_chip, d->host_data,
> > +	irq_domain_set_info(d, irq, hwirq, chip, d->host_data,
> 
> So this sets 'chip_data' to the chip itself. What's the point? Just set
> it to NULL as the chip obviously does not need chip_data at all.

Will fix. Thanks.

Best regards,
Peter Lin

> >  			    handle_percpu_devid_irq, NULL, NULL);
> >  
> >  	return 0;
> > @@ -112,11 +147,12 @@ static struct fwnode_handle *riscv_intc_hwnode(void)
> >  	return intc_domain->fwnode;
> >  }
> >  
> > -static int __init riscv_intc_init_common(struct fwnode_handle *fn)
> > +static int __init riscv_intc_init_common(struct fwnode_handle *fn,
> > +					 struct irq_chip *chip)
> >  {
> >  	int rc;
> >  
> > -	intc_domain = irq_domain_create_tree(fn, &riscv_intc_domain_ops, NULL);
> > +	intc_domain = irq_domain_create_tree(fn, &riscv_intc_domain_ops, chip);
> >  	if (!intc_domain) {
> >  		pr_err("unable to add IRQ domain\n");
> >  		return -ENXIO;
> > @@ -138,6 +174,7 @@ static int __init riscv_intc_init(struct device_node *node,
> >  {
> >  	int rc;
> >  	unsigned long hartid;
> > +	struct irq_chip *chip = &riscv_intc_chip;
> 
> https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#variable-declarations
> 
> Thanks
> 
>         tglx