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authorMarc Zyngier <maz@kernel.org>2019-07-25 17:30:51 +0300
committerMarc Zyngier <maz@kernel.org>2019-08-20 12:23:35 +0300
commitad5a78d3da81836c88d1f2d53310484462660997 (patch)
tree669099a397f32c0356df947805229ba68e0b4579 /drivers/irqchip
parent5f51f803826e4f4aedff415ddaf14efa707be5a7 (diff)
downloadlinux-ad5a78d3da81836c88d1f2d53310484462660997.tar.xz
irqchip/gic-v3: Warn about inconsistent implementations of extended ranges
As is it usual for the GIC, it isn't disallowed to put together a system that is majorly inconsistent, with a distributor supporting the extended ranges while some of the CPUs don't. Kindly tell the user that things are sailing isn't going to be smooth. Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-gic-v3.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index d3727e877872..8af08dd674f8 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1014,6 +1014,11 @@ static void gic_cpu_init(void)
gic_enable_redist(true);
+ WARN((gic_data.ppi_nr > 16 || GIC_ESPI_NR != 0) &&
+ !(gic_read_ctlr() & ICC_CTLR_EL1_ExtRange),
+ "Distributor has extended ranges, but CPU%d doesn't\n",
+ smp_processor_id());
+
rbase = gic_data_rdist_sgi_base();
/* Configure SGIs/PPIs as non-secure Group-1 */