[PATCH v3 05/15] vfio/mdpy: Use the new device life cycle helpers

Kevin Tian
2022-09-09T03:05:21Z

From: Yi Liu <yi.l.liu@intel.com>

and manage mdpy_count inside @init/@release.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
---
samples/vfio-mdev/mdpy.c | 81 +++++++++++++++++++++++-----------------
1 file changed, 47 insertions(+), 34 deletions(-)

diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index e8c46eb2e246..a07dac16d873 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -216,61 +216,77 @@ static int mdpy_reset(struct mdev_state *mdev_state)
return 0;
}

-static int mdpy_probe(struct mdev_device *mdev)
+static int mdpy_init_dev(struct vfio_device *vdev)
{
+ struct mdev_state *mdev_state =
+ container_of(vdev, struct mdev_state, vdev);
+ struct mdev_device *mdev = to_mdev_device(vdev->dev);
const struct mdpy_type *type =
&mdpy_types[mdev_get_type_group_id(mdev)];
- struct device *dev = mdev_dev(mdev);
- struct mdev_state *mdev_state;
u32 fbsize;
- int ret;
+ int ret = -ENOMEM;

if (mdpy_count >= max_devices)
- return -ENOMEM;
-
- mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
- if (mdev_state == NULL)
- return -ENOMEM;
- vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mdpy_dev_ops);
+ return ret;

mdev_state->vconfig = kzalloc(MDPY_CONFIG_SPACE_SIZE, GFP_KERNEL);
- if (mdev_state->vconfig == NULL) {
- ret = -ENOMEM;
- goto err_state;
- }
+ if (!mdev_state->vconfig)
+ return ret;

fbsize = roundup_pow_of_two(type->width * type->height * type->bytepp);

mdev_state->memblk = vmalloc_user(fbsize);
- if (!mdev_state->memblk) {
- ret = -ENOMEM;
- goto err_vconfig;
- }
- dev_info(dev, "%s: %s (%dx%d)\n", __func__, type->name, type->width,
- type->height);
+ if (!mdev_state->memblk)
+ goto out_vconfig;

mutex_init(&mdev_state->ops_lock);
mdev_state->mdev = mdev;
- mdev_state->type = type;
+ mdev_state->type = type;
mdev_state->memsize = fbsize;
mdpy_create_config_space(mdev_state);
mdpy_reset(mdev_state);

+ dev_info(vdev->dev, "%s: %s (%dx%d)\n", __func__, type->name, type->width,
+ type->height);
+
mdpy_count++;
+ return 0;
+
+out_vconfig:
+ kfree(mdev_state->vconfig);
+ return ret;
+}
+
+static int mdpy_probe(struct mdev_device *mdev)
+{
+ struct mdev_state *mdev_state;
+ int ret;
+
+ mdev_state = vfio_alloc_device(mdev_state, vdev, &mdev->dev,
+ &mdpy_dev_ops);
+ if (IS_ERR(mdev_state))
+ return PTR_ERR(mdev_state);

ret = vfio_register_emulated_iommu_dev(&mdev_state->vdev);
if (ret)
- goto err_mem;
+ goto err_put_vdev;
dev_set_drvdata(&mdev->dev, mdev_state);
return 0;
-err_mem:
+
+err_put_vdev:
+ vfio_put_device(&mdev_state->vdev);
+ return ret;
+}
+
+static void mdpy_release_dev(struct vfio_device *vdev)
+{
+ struct mdev_state *mdev_state =
+ container_of(vdev, struct mdev_state, vdev);
+
vfree(mdev_state->memblk);
-err_vconfig:
kfree(mdev_state->vconfig);
-err_state:
- vfio_uninit_group_dev(&mdev_state->vdev);
- kfree(mdev_state);
- return ret;
+ vfio_free_device(vdev);
+ mdpy_count--;
}

static void mdpy_remove(struct mdev_device *mdev)
@@ -280,12 +296,7 @@ static void mdpy_remove(struct mdev_device *mdev)
dev_info(&mdev->dev, "%s\n", __func__);

vfio_unregister_group_dev(&mdev_state->vdev);
- vfree(mdev_state->memblk);
- kfree(mdev_state->vconfig);
- vfio_uninit_group_dev(&mdev_state->vdev);
- kfree(mdev_state);
-
- mdpy_count--;
+ vfio_put_device(&mdev_state->vdev);
}

static ssize_t mdpy_read(struct vfio_device *vdev, char __user *buf,
@@ -708,6 +719,8 @@ static struct attribute_group *mdev_type_groups[] = {
};

static const struct vfio_device_ops mdpy_dev_ops = {
+ .init = mdpy_init_dev,
+ .release = mdpy_release_dev,
.read = mdpy_read,
.write = mdpy_write,
.ioctl = mdpy_ioctl,
--
2.21.3