irqdomain: Allow quiet failure mode
Some interrupt controllers refuse to map interrupts marked as
"protected" by firwmare. Since we try to map everyting in the
device-tree on some platforms, we end up with a lot of nasty
WARN's in the boot log for what is a normal situation on those
machines.
This defines a specific return code (-EPERM) from the host map()
callback which cause irqdomain to fail silently.
MPIC is updated to return this when hitting a protected source
printing only a single line message for diagnostic purposes.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index d30e6a6..ee21b5e 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -1001,8 +1001,12 @@
if (hw == mpic->spurious_vec)
return -EINVAL;
- if (mpic->protected && test_bit(hw, mpic->protected))
- return -EINVAL;
+ if (mpic->protected && test_bit(hw, mpic->protected)) {
+ pr_warning("mpic: Mapping of source 0x%x failed, "
+ "source protected by firmware !\n",\
+ (unsigned int)hw);
+ return -EPERM;
+ }
#ifdef CONFIG_SMP
else if (hw >= mpic->ipi_vecs[0]) {
@@ -1029,8 +1033,12 @@
if (mpic_map_error_int(mpic, virq, hw))
return 0;
- if (hw >= mpic->num_sources)
+ if (hw >= mpic->num_sources) {
+ pr_warning("mpic: Mapping of source 0x%x failed, "
+ "source out of range !\n",\
+ (unsigned int)hw);
return -EINVAL;
+ }
mpic_msi_reserve_hwirq(mpic, hw);