sh: irq: Teach ipr and intc about dynamically allocating irq_descs.

This hooks in irq_to_desc_alloc_cpu() to the necessary code paths in the
intc and ipr controller registration paths. As these are the primary call
paths for all SH CPUs, this alone will make all CPUs sparse IRQ ready.

There is the added benefit now that each CPU contains specific IPR and
INTC tables, so only the vectors with interrupt sources backing them will
ever see an irq_desc instantiation. This effectively packs irq_desc
down to match the CPU, rather than padding NR_IRQS out to cover the valid
vector range.

Boards with extra sources will still have to fiddle with the nr_irqs
setting, but they can continue doing so through the machvec as before.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/kernel/cpu/irq/ipr.c b/arch/sh/kernel/cpu/irq/ipr.c
index 3eb17ee5540e88d5c7bd99ae133d597af9e049de..fa0c8467a280e771971b173cb276eecdd4ed7e4d 100644 (file)
--- a/arch/sh/kernel/cpu/irq/ipr.c
+++ b/arch/sh/kernel/cpu/irq/ipr.c
@@ -59,10 +59,18 @@ void register_ipr_controller(struct ipr_desc *desc)
 
        for (i = 0; i < desc->nr_irqs; i++) {
                struct ipr_data *p = desc->ipr_data + i;
+               struct irq_desc *irq_desc;
 
                BUG_ON(p->ipr_idx >= desc->nr_offsets);
                BUG_ON(!desc->ipr_offsets[p->ipr_idx]);
 
+               irq_desc = irq_to_desc_alloc_cpu(p->irq, smp_processor_id());
+               if (unlikely(!irq_desc)) {
+                       printk(KERN_INFO "can not get irq_desc for %d\n",
+                              p->irq);
+                       continue;
+               }
+
                disable_irq_nosync(p->irq);
                set_irq_chip_and_handler_name(p->irq, &desc->chip,
                                      handle_level_irq, "level");

diff --git a/drivers/sh/intc.c b/drivers/sh/intc.c
index 12d13d99b6f09690c9ec31a42ae630f460f039f4..098b767e9afdaf1f1c11aaff3f22833ecd93c170 100644 (file)
--- a/drivers/sh/intc.c
+++ b/drivers/sh/intc.c
@@ -671,7 +671,7 @@ unsigned int intc_evt2irq(unsigned int vector)
 
 void __init register_intc_controller(struct intc_desc *desc)
 {
-       unsigned int i, k, smp;
+       unsigned int i, k, smp, cpu = smp_processor_id();
        struct intc_desc_int *d;
 
        d = alloc_bootmem(sizeof(*d));
@@ -770,11 +770,19 @@ void __init register_intc_controller(struct intc_desc *desc)
        /* register the vectors one by one */
        for (i = 0; i < desc->nr_vectors; i++) {
                struct intc_vect *vect = desc->vectors + i;
+               unsigned int irq = evt2irq(vect->vect);
+               struct irq_desc *irq_desc;
 
                if (!vect->enum_id)
                        continue;
 
-               intc_register_irq(desc, d, vect->enum_id, evt2irq(vect->vect));
+               irq_desc = irq_to_desc_alloc_cpu(irq, cpu);
+               if (unlikely(!irq_desc)) {
+                       printk(KERN_INFO "can not get irq_desc for %d\n", irq);
+                       continue;
+               }
+
+               intc_register_irq(desc, d, vect->enum_id, irq);
        }
 }