linux-kernel - [PATCH v2] irqchip/gicv3-its: ITS table size should not be smaller than PSZ

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Date:	Thu, 16 Apr 2015 13:30:59 +0800
From:	Minghuan Lian <Minghuan.Lian@...escale.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	Zang Roy-R61911 <r61911@...escale.com>,
	Hu Mingkai-B21284 <B21284@...escale.com>,
	"Yoder Stuart-B08248" <stuart.yoder@...escale.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Minghuan Lian <Minghuan.Lian@...escale.com>
Subject: [PATCH v2] irqchip/gicv3-its: ITS table size should not be smaller than PSZ

The default page size of ITS table has been changed to 64KB,
but for some platforms the real size of allocated memory which
calculated by DEVBITS of register GITS_TYPER may be smaller than
default size. In this case, the allocation size must be increased
to the default size, otherwise, the wrong page number will cause
kernel hang.

Signed-off-by: Minghuan Lian <Minghuan.Lian@...escale.com>
---
v2-v1:
Increase allocation size instead of decreasing PSZ

 drivers/irqchip/irq-gic-v3-its.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 9687f8a..19ab86d 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -828,7 +828,8 @@ static int its_alloc_tables(struct its_node *its)
 			u64 typer = readq_relaxed(its->base + GITS_TYPER);
 			u32 ids = GITS_TYPER_DEVBITS(typer);
 
-			order = get_order((1UL << ids) * entry_size);
+			order = max(get_order((1UL << ids) * entry_size),
+				    order);
 			if (order >= MAX_ORDER) {
 				order = MAX_ORDER - 1;
 				pr_warn("%s: Device Table too large, reduce its page order to %u\n",
-- 
1.9.1

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