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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-05-06 11:37:43 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-05-06 11:37:43 +1000
commit5fe0c1f2f0dca3351536284b0180a79f341b7854 (patch)
tree20e7cc0ae006c8e21fb476d27eeed30771262706 /arch/powerpc/sysdev/mpic.c
parentf3d40c2532fee15a30d7a364ac365c21748a4a95 (diff)
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>
Diffstat (limited to 'arch/powerpc/sysdev/mpic.c')
-rw-r--r--arch/powerpc/sysdev/mpic.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index d30e6a676c8..ee21b5e71ae 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -1001,8 +1001,12 @@ static int mpic_host_map(struct irq_domain *h, unsigned int virq,
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 @@ static int mpic_host_map(struct irq_domain *h, unsigned int virq,
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);