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iommufd/selftest: Test IOMMU_HWPT_ALLOC_DIRTY_TRACKING

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In order to selftest the iommu domain dirty enforcing implement the
mock_domain necessary support and add a new dev_flags to test that the
hwpt_alloc/attach_device fails as expected.

Expand the existing mock_domain fixture with a enforce_dirty test that
exercises the hwpt_alloc and device attachment.

Link: https://lore.kernel.org/r/20231024135109.73787-15-joao.m.martins@oracle.com
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Joao Martins 2023-10-24 14:51:05 +01:00 committed by Jason Gunthorpe
parent e04b23c8d4
commit 266ce58989
3 changed files with 88 additions and 1 deletions
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37
drivers/iommu/iommufd/selftest.c
View file

@ -119,6 +119,11 @@ static void mock_domain_blocking_free(struct iommu_domain *domain)
static int mock_domain_nop_attach(struct iommu_domain *domain,
struct device *dev)
{
struct mock_dev *mdev = container_of(dev, struct mock_dev, dev);
if (domain->dirty_ops && (mdev->flags & MOCK_FLAGS_DEVICE_NO_DIRTY))
return -EINVAL;
return 0;
}
@ -147,6 +152,25 @@ static void *mock_domain_hw_info(struct device *dev, u32 *length, u32 *type)
return info;
}
static int mock_domain_set_dirty_tracking(struct iommu_domain *domain,
bool enable)
{
return 0;
}
static int mock_domain_read_and_clear_dirty(struct iommu_domain *domain,
unsigned long iova, size_t size,
unsigned long flags,
struct iommu_dirty_bitmap *dirty)
{
return 0;
}
const struct iommu_dirty_ops dirty_ops = {
.set_dirty_tracking = mock_domain_set_dirty_tracking,
.read_and_clear_dirty = mock_domain_read_and_clear_dirty,
};
static const struct iommu_ops mock_ops;
static struct iommu_domain *mock_domain_alloc(unsigned int iommu_domain_type)
@ -174,12 +198,20 @@ static struct iommu_domain *mock_domain_alloc(unsigned int iommu_domain_type)
static struct iommu_domain *
mock_domain_alloc_user(struct device *dev, u32 flags)
{
struct mock_dev *mdev = container_of(dev, struct mock_dev, dev);
struct iommu_domain *domain;
if (flags & (~IOMMU_HWPT_ALLOC_NEST_PARENT))
if (flags &
(~(IOMMU_HWPT_ALLOC_NEST_PARENT | IOMMU_HWPT_ALLOC_DIRTY_TRACKING)))
return ERR_PTR(-EOPNOTSUPP);
if ((flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING) &&
(mdev->flags & MOCK_FLAGS_DEVICE_NO_DIRTY))
return ERR_PTR(-EOPNOTSUPP);
domain = mock_domain_alloc(IOMMU_DOMAIN_UNMANAGED);
if (domain && !(mdev->flags & MOCK_FLAGS_DEVICE_NO_DIRTY))
domain->dirty_ops = &dirty_ops;
if (!domain)
domain = ERR_PTR(-ENOMEM);
return domain;
@ -387,6 +419,9 @@ static struct mock_dev *mock_dev_create(unsigned long dev_flags)
struct mock_dev *mdev;
int rc;
if (dev_flags & ~(MOCK_FLAGS_DEVICE_NO_DIRTY))
return ERR_PTR(-EINVAL);
mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
if (!mdev)
return ERR_PTR(-ENOMEM);

49
tools/testing/selftests/iommu/iommufd.c
View file

@ -1433,6 +1433,55 @@ TEST_F(iommufd_mock_domain, alloc_hwpt)
}
}
FIXTURE(iommufd_dirty_tracking)
{
int fd;
uint32_t ioas_id;
uint32_t hwpt_id;
uint32_t stdev_id;
uint32_t idev_id;
};
FIXTURE_SETUP(iommufd_dirty_tracking)
{
self->fd = open("/dev/iommu", O_RDWR);
ASSERT_NE(-1, self->fd);
test_ioctl_ioas_alloc(&self->ioas_id);
test_cmd_mock_domain(self->ioas_id, &self->stdev_id, &self->hwpt_id,
&self->idev_id);
}
FIXTURE_TEARDOWN(iommufd_dirty_tracking)
{
teardown_iommufd(self->fd, _metadata);
}
TEST_F(iommufd_dirty_tracking, enforce_dirty)
{
uint32_t ioas_id, stddev_id, idev_id;
uint32_t hwpt_id, _hwpt_id;
uint32_t dev_flags;
/* Regular case */
dev_flags = MOCK_FLAGS_DEVICE_NO_DIRTY;
test_cmd_hwpt_alloc(self->idev_id, self->ioas_id,
IOMMU_HWPT_ALLOC_DIRTY_TRACKING, &hwpt_id);
test_cmd_mock_domain(hwpt_id, &stddev_id, NULL, NULL);
test_err_mock_domain_flags(EINVAL, hwpt_id, dev_flags, &stddev_id,
NULL);
test_ioctl_destroy(stddev_id);
test_ioctl_destroy(hwpt_id);
/* IOMMU device does not support dirty tracking */
test_ioctl_ioas_alloc(&ioas_id);
test_cmd_mock_domain_flags(ioas_id, dev_flags, &stddev_id, &_hwpt_id,
&idev_id);
test_err_hwpt_alloc(EOPNOTSUPP, idev_id, ioas_id,
IOMMU_HWPT_ALLOC_DIRTY_TRACKING, &hwpt_id);
test_ioctl_destroy(stddev_id);
}
/* VFIO compatibility IOCTLs */
TEST_F(iommufd, simple_ioctls)

3
tools/testing/selftests/iommu/iommufd_utils.h
View file

@ -98,6 +98,9 @@ static int _test_cmd_mock_domain_flags(int fd, unsigned int ioas_id,
*idev_id = cmd.mock_domain_flags.out_idev_id;
return 0;
}
#define test_cmd_mock_domain_flags(ioas_id, flags, stdev_id, hwpt_id, idev_id) \
ASSERT_EQ(0, _test_cmd_mock_domain_flags(self->fd, ioas_id, flags, \
stdev_id, hwpt_id, idev_id))
#define test_err_mock_domain_flags(_errno, ioas_id, flags, stdev_id, hwpt_id) \
EXPECT_ERRNO(_errno, \
_test_cmd_mock_domain_flags(self->fd, ioas_id, flags, \