When required size of Device Table is out of the page allocator's
capability, the whole ITS will fail in probing. This actually is
not the hardware's problem and is mainly a limitation of the kernel
page allocator. This patch will keep ITS going on to the next
initializaion stage with an explicit warning.
Acked-by: Marc Zyngier <marc.zyng...@arm.com>
Signed-off-by: Yun Wu <wuyun...@huawei.com>
---
drivers/irqchip/irq-gic-v3-its.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index f5bfa42..e8bda0b 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -828,6 +828,11 @@ static int its_alloc_tables(struct its_node *its)
u32 ids = GITS_TYPER_DEVBITS(typer);
order = get_order((1UL << ids) * entry_size);
+ if (order >= MAX_ORDER) {
+ order = MAX_ORDER - 1;
+ pr_warn("%s: Device Table too large, reduce its
page order to %u\n",
+ its->msi_chip.of_node->full_name,
order);
+ }
}
alloc_size = (1 << order) * PAGE_SIZE;
--
1.8.0
--
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