Messages in this thread | | | Date | Wed, 20 May 2015 13:14:38 +0100 | From | Marc Zyngier <> | Subject | Re: [PATCH 2/4] arm64: gicv3: its: Add range check for number of allocated pages |
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On Sun, 3 May 2015 21:49:30 +0100 Robert Richter <rric@kernel.org> wrote:
> From: Robert Richter <rrichter@cavium.com> > > The number of pages for the its table may exceed the maximum of 256. > Adding a range check and limitting the number to its maximum. > > Based on a patch from Tirumalesh Chalamarla <tchalamarla@cavium.com>. > > Signed-off-by: Robert Richter <rrichter@cavium.com>
Looks good to me.
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
M.
> --- > drivers/irqchip/irq-gic-v3-its.c | 11 ++++++++++- > include/linux/irqchip/arm-gic-v3.h | 1 + > 2 files changed, 11 insertions(+), 1 deletion(-) > > diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c > index e30b4de04c6c..a2619a1d5bb3 100644 > --- a/drivers/irqchip/irq-gic-v3-its.c > +++ b/drivers/irqchip/irq-gic-v3-its.c > @@ -810,6 +810,7 @@ static int its_alloc_tables(struct its_node *its) > u64 entry_size = GITS_BASER_ENTRY_SIZE(val); > int order = get_order(psz); > int alloc_size; > + int alloc_pages; > u64 tmp; > void *base; > > @@ -837,6 +838,14 @@ static int its_alloc_tables(struct its_node *its) > } > > alloc_size = (1 << order) * PAGE_SIZE; > + alloc_pages = (alloc_size / psz); > + if (alloc_pages > GITS_BASER_PAGES_MAX) { > + alloc_pages = GITS_BASER_PAGES_MAX; > + order = get_order(GITS_BASER_PAGES_MAX * psz); > + pr_warn("%s: Device Table too large, reduce its page order to %u (%u pages)\n", > + its->msi_chip.of_node->full_name, order, alloc_pages); > + } > + > base = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order); > if (!base) { > err = -ENOMEM; > @@ -865,7 +874,7 @@ static int its_alloc_tables(struct its_node *its) > break; > } > > - val |= (alloc_size / psz) - 1; > + val |= alloc_pages - 1; > > writeq_relaxed(val, its->base + GITS_BASER + i * 8); > tmp = readq_relaxed(its->base + GITS_BASER + i * 8); > diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h > index ffbc034c8810..f28da189c4aa 100644 > --- a/include/linux/irqchip/arm-gic-v3.h > +++ b/include/linux/irqchip/arm-gic-v3.h > @@ -229,6 +229,7 @@ > #define GITS_BASER_PAGE_SIZE_16K (1UL << GITS_BASER_PAGE_SIZE_SHIFT) > #define GITS_BASER_PAGE_SIZE_64K (2UL << GITS_BASER_PAGE_SIZE_SHIFT) > #define GITS_BASER_PAGE_SIZE_MASK (3UL << GITS_BASER_PAGE_SIZE_SHIFT) > +#define GITS_BASER_PAGES_MAX 256 > > #define GITS_BASER_TYPE_NONE 0 > #define GITS_BASER_TYPE_DEVICE 1
-- Without deviation from the norm, progress is not possible.
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