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vfio/platform: store mapped memory in region, instead of an on-stack copy

Browse source 
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: 6e3f264560 "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>
This commit is contained in:
James Morse 2015-10-29 16:50:43 +00:00 committed by Alex Williamson
parent 4644321fd3
commit 1b4bb2eaa9
1 changed files with 18 additions and 18 deletions
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36
drivers/vfio/platform/vfio_platform_common.c
View file

@ -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 */