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irqchip: gicv3-its: Add limitation to page order 

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.zyngier@arm.com>
Signed-off-by: Yun Wu <wuyun.wu@huawei.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Link: https://lkml.kernel.org/r/1425659870-11832-10-git-send-email-marc.zyngier@arm.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Yun Wu 2015-03-06 16:37:48 +00:00 committed by Jason Cooper
parent 790b57aed1
commit 1d27704a26
1 changed files with 5 additions and 0 deletions
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5
drivers/irqchip/irq-gic-v3-its.c
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@ -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;