linux-kernel - [PATCH v4 3/5] irqchip: gicv3-its: add limitation to page order

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Message-ID: <1425615203-3300-4-git-send-email-wuyun.wu@huawei.com>
Date:	Fri, 6 Mar 2015 12:13:21 +0800
From:	Yun Wu <wuyun.wu@...wei.com>
To:	<marc.zyngier@....com>, <tglx@...utronix.de>,
	<jason@...edaemon.net>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Yun Wu <wuyun.wu@...wei.com>
Subject: [PATCH v4 3/5] 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@....com>
Signed-off-by: Yun Wu <wuyun.wu@...wei.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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