diff mbox series

[4/9] sh: intc: Drop the use of irq_create_identity_mapping()

Message ID 20210406093557.1073423-5-maz@kernel.org (mailing list archive)
State New
Headers show
Series Cleaning up some of the irqdomain features | expand

Commit Message

Marc Zyngier April 6, 2021, 9:35 a.m. UTC
Instead of playing games with using irq_create_identity_mapping()
and irq_domain_associate(), drop the use of the former and only
use the latter, together with the allocation of the irq_desc
as needed.

It doesn't make the code less awful, but at least the intent
is clearer.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 drivers/sh/intc/core.c | 50 ++++++++++++++++++------------------------
 1 file changed, 21 insertions(+), 29 deletions(-)

Comments

Geert Uytterhoeven April 6, 2021, 10:32 a.m. UTC | #1
Hi Marc,

On Tue, Apr 6, 2021 at 11:44 AM Marc Zyngier <maz@kernel.org> wrote:
> Instead of playing games with using irq_create_identity_mapping()
> and irq_domain_associate(), drop the use of the former and only
> use the latter, together with the allocation of the irq_desc
> as needed.
>
> It doesn't make the code less awful, but at least the intent
> is clearer.
>
> Signed-off-by: Marc Zyngier <maz@kernel.org>

Thanks for your patch!

> --- a/drivers/sh/intc/core.c
> +++ b/drivers/sh/intc/core.c
> @@ -179,6 +179,23 @@ static unsigned int __init save_reg(struct intc_desc_int *d,
>         return 0;
>  }
>
> +static bool __init intc_map(struct irq_domain *domain, int irq)
> +{
> +       int res;

warning: unused variable ‘res’ [-Wunused-variable]

> +
> +       if (!irq_to_desc(irq) && irq_alloc_desc_at(irq, NUMA_NO_NODE) != irq) {
> +               pr_err("uname to allocate IRQ %d\n", irq);
> +               return false;
> +       }
> +
> +       if (irq_domain_associate(domain, irq, irq)) {
> +               pr_err("domain association failure\n");
> +               return false;
> +       }
> +
> +       return true;
> +}
> +
>  int __init register_intc_controller(struct intc_desc *desc)
>  {
>         unsigned int i, k, smp;
> @@ -316,19 +333,8 @@ int __init register_intc_controller(struct intc_desc *desc)

warning: unused variable ‘res’ [-Wunused-variable]

>                 if (!vect->enum_id)
>                         continue;
>
> -               res = irq_create_identity_mapping(d->domain, irq);


> -               if (unlikely(res)) {
> -                       if (res == -EEXIST) {
> -                               res = irq_domain_associate(d->domain, irq, irq);
> -                               if (unlikely(res)) {
> -                                       pr_err("domain association failure\n");
> -                                       continue;
> -                               }
> -                       } else {
> -                               pr_err("can't identity map IRQ %d\n", irq);
> -                               continue;
> -                       }
> -               }
> +               if (!intc_map(d->domain, irq))
> +                       continue;
>
>                 intc_irq_xlate_set(irq, vect->enum_id, d);
>                 intc_register_irq(desc, d, vect->enum_id, irq);

Otherwise this seems to work fine on real hardware (landisk) and qemu
(rts7751r2d).  I did verify that the new function intc_map() is called.

Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert
Marc Zyngier April 6, 2021, 1:02 p.m. UTC | #2
On Tue, 06 Apr 2021 11:32:13 +0100,
Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> 
> Hi Marc,
> 
> On Tue, Apr 6, 2021 at 11:44 AM Marc Zyngier <maz@kernel.org> wrote:
> > Instead of playing games with using irq_create_identity_mapping()
> > and irq_domain_associate(), drop the use of the former and only
> > use the latter, together with the allocation of the irq_desc
> > as needed.
> >
> > It doesn't make the code less awful, but at least the intent
> > is clearer.
> >
> > Signed-off-by: Marc Zyngier <maz@kernel.org>
> 
> Thanks for your patch!
> 
> > --- a/drivers/sh/intc/core.c
> > +++ b/drivers/sh/intc/core.c
> > @@ -179,6 +179,23 @@ static unsigned int __init save_reg(struct intc_desc_int *d,
> >         return 0;
> >  }
> >
> > +static bool __init intc_map(struct irq_domain *domain, int irq)
> > +{
> > +       int res;
> 
> warning: unused variable ‘res’ [-Wunused-variable]
> 
> > +
> > +       if (!irq_to_desc(irq) && irq_alloc_desc_at(irq, NUMA_NO_NODE) != irq) {
> > +               pr_err("uname to allocate IRQ %d\n", irq);
> > +               return false;
> > +       }
> > +
> > +       if (irq_domain_associate(domain, irq, irq)) {
> > +               pr_err("domain association failure\n");
> > +               return false;
> > +       }
> > +
> > +       return true;
> > +}
> > +
> >  int __init register_intc_controller(struct intc_desc *desc)
> >  {
> >         unsigned int i, k, smp;
> > @@ -316,19 +333,8 @@ int __init register_intc_controller(struct intc_desc *desc)
> 
> warning: unused variable ‘res’ [-Wunused-variable]

Ah, thanks for spotting these.

> 
> >                 if (!vect->enum_id)
> >                         continue;
> >
> > -               res = irq_create_identity_mapping(d->domain, irq);
> 
> 
> > -               if (unlikely(res)) {
> > -                       if (res == -EEXIST) {
> > -                               res = irq_domain_associate(d->domain, irq, irq);
> > -                               if (unlikely(res)) {
> > -                                       pr_err("domain association failure\n");
> > -                                       continue;
> > -                               }
> > -                       } else {
> > -                               pr_err("can't identity map IRQ %d\n", irq);
> > -                               continue;
> > -                       }
> > -               }
> > +               if (!intc_map(d->domain, irq))
> > +                       continue;
> >
> >                 intc_irq_xlate_set(irq, vect->enum_id, d);
> >                 intc_register_irq(desc, d, vect->enum_id, irq);
> 
> Otherwise this seems to work fine on real hardware (landisk) and qemu
> (rts7751r2d).  I did verify that the new function intc_map() is called.
> 
> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>

Awesome, thanks Geert.

	M.
diff mbox series

Patch

diff --git a/drivers/sh/intc/core.c b/drivers/sh/intc/core.c
index a14684ffe4c1..6c57ee1ce6c4 100644
--- a/drivers/sh/intc/core.c
+++ b/drivers/sh/intc/core.c
@@ -179,6 +179,23 @@  static unsigned int __init save_reg(struct intc_desc_int *d,
 	return 0;
 }
 
+static bool __init intc_map(struct irq_domain *domain, int irq)
+{
+	int res;
+
+	if (!irq_to_desc(irq) && irq_alloc_desc_at(irq, NUMA_NO_NODE) != irq) {
+		pr_err("uname to allocate IRQ %d\n", irq);
+		return false;
+	}
+
+	if (irq_domain_associate(domain, irq, irq)) {
+		pr_err("domain association failure\n");
+		return false;
+	}
+
+	return true;
+}
+
 int __init register_intc_controller(struct intc_desc *desc)
 {
 	unsigned int i, k, smp;
@@ -316,19 +333,8 @@  int __init register_intc_controller(struct intc_desc *desc)
 		if (!vect->enum_id)
 			continue;
 
-		res = irq_create_identity_mapping(d->domain, irq);
-		if (unlikely(res)) {
-			if (res == -EEXIST) {
-				res = irq_domain_associate(d->domain, irq, irq);
-				if (unlikely(res)) {
-					pr_err("domain association failure\n");
-					continue;
-				}
-			} else {
-				pr_err("can't identity map IRQ %d\n", irq);
-				continue;
-			}
-		}
+		if (!intc_map(d->domain, irq))
+			continue;
 
 		intc_irq_xlate_set(irq, vect->enum_id, d);
 		intc_register_irq(desc, d, vect->enum_id, irq);
@@ -345,22 +351,8 @@  int __init register_intc_controller(struct intc_desc *desc)
 			 * IRQ support, each vector still needs to have
 			 * its own backing irq_desc.
 			 */
-			res = irq_create_identity_mapping(d->domain, irq2);
-			if (unlikely(res)) {
-				if (res == -EEXIST) {
-					res = irq_domain_associate(d->domain,
-								   irq2, irq2);
-					if (unlikely(res)) {
-						pr_err("domain association "
-						       "failure\n");
-						continue;
-					}
-				} else {
-					pr_err("can't identity map IRQ %d\n",
-					       irq);
-					continue;
-				}
-			}
+			if (!intc_map(d->domain, irq2))
+				continue;
 
 			vect2->enum_id = 0;