[PATCH v4 1/5] irqchip, gicv3-its: Add range check for number of allocated pages
From: Robert Richter
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 .
Signed-off-by: Tirumalesh Chalamarla
Reviewed-by: Marc Zyngier
Signed-off-by: Robert Richter
---
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 1b7e155869f6..466edf8a7477 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;
@@ -844,6 +845,14 @@ 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;
@@ -872,7 +881,7 @@ 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
--
2.1.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[PATCH v4 1/5] irqchip, gicv3-its: Add range check for number of allocated pages
From: Robert Richter rrich...@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 tchalama...@cavium.com.
Signed-off-by: Tirumalesh Chalamarla tchalama...@cavium.com
Reviewed-by: Marc Zyngier marc.zyng...@arm.com
Signed-off-by: Robert Richter rrich...@cavium.com
---
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 1b7e155869f6..466edf8a7477 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;
@@ -844,6 +845,14 @@ 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;
@@ -872,7 +881,7 @@ 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
--
2.1.1
--
To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
