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irqchip: gicv3-its: Add limitation to page order

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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;