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x86: dt: Use linear irq domain for ioapic(s) 

The former conversion to irq_domain_add_legacy() did not fully work
since we miss the irq decs for NR_IRQS_LEGACY+.

Ideally we could use irq_domain_add_simple() or the no-map variant (and
program the virq <-> line mapping directly into ioapic) but this would
require a different irq lookup in "do_IRQ()" and won't work with ACPI
without changes. So this is probably easiest for everyone.

Tested-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Link: http://lkml.kernel.org/r/20120813202304.GA3529@breakpoint.cc
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2012-08-13 22:23:33 +02:00 committed by Thomas Gleixner
parent 9160338de9
commit ece3234a77
1 changed files with 42 additions and 9 deletions
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51
arch/x86/kernel/devicetree.c
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@ -342,6 +342,47 @@ const struct irq_domain_ops ioapic_irq_domain_ops = {
.xlate = ioapic_xlate, .xlate = ioapic_xlate,
}; };
static void dt_add_ioapic_domain(unsigned int ioapic_num,
struct device_node *np)
{
struct irq_domain *id;
struct mp_ioapic_gsi *gsi_cfg;
int ret;
int num;
gsi_cfg = mp_ioapic_gsi_routing(ioapic_num);
num = gsi_cfg->gsi_end - gsi_cfg->gsi_base + 1;
id = irq_domain_add_linear(np, num, &ioapic_irq_domain_ops,
(void *)ioapic_num);
BUG_ON(!id);
if (gsi_cfg->gsi_base == 0) {
/*
* The first NR_IRQS_LEGACY irq descs are allocated in
* early_irq_init() and need just a mapping. The
* remaining irqs need both. All of them are preallocated
* and assigned so we can keep the 1:1 mapping which the ioapic
* is having.
*/
ret = irq_domain_associate_many(id, 0, 0, NR_IRQS_LEGACY);
if (ret)
pr_err("Error mapping legacy IRQs: %d\n", ret);
if (num > NR_IRQS_LEGACY) {
ret = irq_create_strict_mappings(id, NR_IRQS_LEGACY,
NR_IRQS_LEGACY, num - NR_IRQS_LEGACY);
if (ret)
pr_err("Error creating mapping for the "
"remaining IRQs: %d\n", ret);
}
irq_set_default_host(id);
} else {
ret = irq_create_strict_mappings(id, gsi_cfg->gsi_base, 0, num);
if (ret)
pr_err("Error creating IRQ mapping: %d\n", ret);
}
}
static void __init ioapic_add_ofnode(struct device_node *np) static void __init ioapic_add_ofnode(struct device_node *np)
{ {
struct resource r; struct resource r;
@ -356,15 +397,7 @@ static void __init ioapic_add_ofnode(struct device_node *np)
for (i = 0; i < nr_ioapics; i++) { for (i = 0; i < nr_ioapics; i++) {
if (r.start == mpc_ioapic_addr(i)) { if (r.start == mpc_ioapic_addr(i)) {
struct irq_domain *id; dt_add_ioapic_domain(i, np);
struct mp_ioapic_gsi *gsi_cfg;
gsi_cfg = mp_ioapic_gsi_routing(i);
id = irq_domain_add_legacy(np, 32, gsi_cfg->gsi_base, 0,
&ioapic_irq_domain_ops,
(void*)i);
BUG_ON(!id);
return; return;
} }
} }