irqchip/gic-v3-its: Check that all RDs have the same property table

If booting with LPIs enabled, all the redistributors must have the
exact same property table. No ifs, no buts.

Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Bhupesh Sharma <bhsharma@redhat.com>
Tested-by: Lei Zhang <zhang.lei@jp.fujitsu.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 83d5573f56e9..828af1a68b8e 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -2029,6 +2029,15 @@ static void its_cpu_init_lpis(void)
         val = readl_relaxed(rbase + GICR_CTLR);
         if ((gic_rdists->flags & RDIST_FLAGS_RD_TABLES_PREALLOCATED) &&
             (val & GICR_CTLR_ENABLE_LPIS)) {
+                /*
+                 * Check that we get the same property table on all
+                 * RDs. If we don't, this is hopeless.
+                 */
+                paddr = gicr_read_propbaser(rbase + GICR_PROPBASER);
+                paddr &= GENMASK_ULL(51, 12);
+                if (WARN_ON(gic_rdists->prop_table_pa != paddr))
+                        add_taint(TAINT_CRAP, LOCKDEP_STILL_OK);
+
                 paddr = gicr_read_pendbaser(rbase + GICR_PENDBASER);
                 paddr &= GENMASK_ULL(51, 16);