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authorJames Morse <james.morse@arm.com>2015-10-29 16:50:43 +0000
committerAlex Williamson <alex.williamson@redhat.com>2015-11-03 12:54:00 -0700
commit1b4bb2eaa9b2583521611b4aa978f9f499c92cd4 (patch)
tree30ce8bb09a0c5d957a12499fc8608d39c2eac008 /drivers/vfio
parent4644321fd3c119a819ab24fd2bc2d1f9bca4a695 (diff)
downloadblackbird-op-linux-1b4bb2eaa9b2583521611b4aa978f9f499c92cd4.tar.gz
blackbird-op-linux-1b4bb2eaa9b2583521611b4aa978f9f499c92cd4.zip
vfio/platform: store mapped memory in region, instead of an on-stack copy
vfio_platform_{read,write}_mmio() call ioremap_nocache() to map a region of io memory, which they store in struct vfio_platform_region to be eventually re-used, or unmapped by vfio_platform_regions_cleanup(). These functions receive a copy of their struct vfio_platform_region argument on the stack - so these mapped areas are always allocated, and always leaked. Pass this argument as a pointer instead. Fixes: 6e3f26456009 "vfio/platform: read and write support for the device fd" Signed-off-by: James Morse <james.morse@arm.com> Acked-by: Baptiste Reynal <b.reynal@virtualopensystems.com> Tested-by: Baptiste Reynal <b.reynal@virtualopensystems.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/platform/vfio_platform_common.c36
1 files changed, 18 insertions, 18 deletions
diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index e43efb5e92bf..8c216de883e3 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -307,17 +307,17 @@ static long vfio_platform_ioctl(void *device_data,
return -ENOTTY;
}
-static ssize_t vfio_platform_read_mmio(struct vfio_platform_region reg,
+static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg,
char __user *buf, size_t count,
loff_t off)
{
unsigned int done = 0;
- if (!reg.ioaddr) {
- reg.ioaddr =
- ioremap_nocache(reg.addr, reg.size);
+ if (!reg->ioaddr) {
+ reg->ioaddr =
+ ioremap_nocache(reg->addr, reg->size);
- if (!reg.ioaddr)
+ if (!reg->ioaddr)
return -ENOMEM;
}
@@ -327,7 +327,7 @@ static ssize_t vfio_platform_read_mmio(struct vfio_platform_region reg,
if (count >= 4 && !(off % 4)) {
u32 val;
- val = ioread32(reg.ioaddr + off);
+ val = ioread32(reg->ioaddr + off);
if (copy_to_user(buf, &val, 4))
goto err;
@@ -335,7 +335,7 @@ static ssize_t vfio_platform_read_mmio(struct vfio_platform_region reg,
} else if (count >= 2 && !(off % 2)) {
u16 val;
- val = ioread16(reg.ioaddr + off);
+ val = ioread16(reg->ioaddr + off);
if (copy_to_user(buf, &val, 2))
goto err;
@@ -343,7 +343,7 @@ static ssize_t vfio_platform_read_mmio(struct vfio_platform_region reg,
} else {
u8 val;
- val = ioread8(reg.ioaddr + off);
+ val = ioread8(reg->ioaddr + off);
if (copy_to_user(buf, &val, 1))
goto err;
@@ -376,7 +376,7 @@ static ssize_t vfio_platform_read(void *device_data, char __user *buf,
return -EINVAL;
if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
- return vfio_platform_read_mmio(vdev->regions[index],
+ return vfio_platform_read_mmio(&vdev->regions[index],
buf, count, off);
else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
return -EINVAL; /* not implemented */
@@ -384,17 +384,17 @@ static ssize_t vfio_platform_read(void *device_data, char __user *buf,
return -EINVAL;
}
-static ssize_t vfio_platform_write_mmio(struct vfio_platform_region reg,
+static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg,
const char __user *buf, size_t count,
loff_t off)
{
unsigned int done = 0;
- if (!reg.ioaddr) {
- reg.ioaddr =
- ioremap_nocache(reg.addr, reg.size);
+ if (!reg->ioaddr) {
+ reg->ioaddr =
+ ioremap_nocache(reg->addr, reg->size);
- if (!reg.ioaddr)
+ if (!reg->ioaddr)
return -ENOMEM;
}
@@ -406,7 +406,7 @@ static ssize_t vfio_platform_write_mmio(struct vfio_platform_region reg,
if (copy_from_user(&val, buf, 4))
goto err;
- iowrite32(val, reg.ioaddr + off);
+ iowrite32(val, reg->ioaddr + off);
filled = 4;
} else if (count >= 2 && !(off % 2)) {
@@ -414,7 +414,7 @@ static ssize_t vfio_platform_write_mmio(struct vfio_platform_region reg,
if (copy_from_user(&val, buf, 2))
goto err;
- iowrite16(val, reg.ioaddr + off);
+ iowrite16(val, reg->ioaddr + off);
filled = 2;
} else {
@@ -422,7 +422,7 @@ static ssize_t vfio_platform_write_mmio(struct vfio_platform_region reg,
if (copy_from_user(&val, buf, 1))
goto err;
- iowrite8(val, reg.ioaddr + off);
+ iowrite8(val, reg->ioaddr + off);
filled = 1;
}
@@ -452,7 +452,7 @@ static ssize_t vfio_platform_write(void *device_data, const char __user *buf,
return -EINVAL;
if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
- return vfio_platform_write_mmio(vdev->regions[index],
+ return vfio_platform_write_mmio(&vdev->regions[index],
buf, count, off);
else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
return -EINVAL; /* not implemented */
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