RE: [PATCH v12 06/24] vfio: Pass struct vfio_device_file * to vfio_device_open/close()

Liu, Yi L
2023-06-13T05:24:26Z

> From: Alex Williamson <alex.williamson@redhat.com>
> Sent: Tuesday, June 13, 2023 5:52 AM
>
> On Fri, 2 Jun 2023 05:16:35 -0700
> Yi Liu <yi.l.liu@intel.com> wrote:
>
> > This avoids passing too much parameters in multiple functions. Per the
> > input parameter change, rename the function to be vfio_df_open/close().
> >
> > Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> > Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
> > Reviewed-by: Eric Auger <eric.auger@redhat.com>
> > Tested-by: Terrence Xu <terrence.xu@intel.com>
> > Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> > Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
> > Tested-by: Yanting Jiang <yanting.jiang@intel.com>
> > Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> > Signed-off-by: Yi Liu <yi.l.liu@intel.com>
> > ---
> > drivers/vfio/group.c | 20 ++++++++++++++------
> > drivers/vfio/vfio.h | 8 ++++----
> > drivers/vfio/vfio_main.c | 25 +++++++++++++++----------
> > 3 files changed, 33 insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/vfio/group.c b/drivers/vfio/group.c
> > index b56e19d2a02d..caf53716ddb2 100644
> > --- a/drivers/vfio/group.c
> > +++ b/drivers/vfio/group.c
> > @@ -169,8 +169,9 @@ static void vfio_device_group_get_kvm_safe(struct vfio_device
> *device)
> > spin_unlock(&device->group->kvm_ref_lock);
> > }
> >
> > -static int vfio_device_group_open(struct vfio_device *device)
> > +static int vfio_df_group_open(struct vfio_device_file *df)
> > {
> > + struct vfio_device *device = df->device;
> > int ret;
> >
> > mutex_lock(&device->group->group_lock);
> > @@ -190,7 +191,11 @@ static int vfio_device_group_open(struct vfio_device *device)
> > if (device->open_count == 0)
> > vfio_device_group_get_kvm_safe(device);
> >
> > - ret = vfio_device_open(device, device->group->iommufd);
> > + df->iommufd = device->group->iommufd;
> > +
> > + ret = vfio_df_open(df);
> > + if (ret)
> > + df->iommufd = NULL;
> >
> > if (device->open_count == 0)
> > vfio_device_put_kvm(device);
> > @@ -202,12 +207,15 @@ static int vfio_device_group_open(struct vfio_device
> *device)
> > return ret;
> > }
> >
> > -void vfio_device_group_close(struct vfio_device *device)
> > +void vfio_df_group_close(struct vfio_device_file *df)
> > {
> > + struct vfio_device *device = df->device;
> > +
> > mutex_lock(&device->group->group_lock);
> > mutex_lock(&device->dev_set->lock);
> >
> > - vfio_device_close(device, device->group->iommufd);
> > + vfio_df_close(df);
> > + df->iommufd = NULL;
> >
> > if (device->open_count == 0)
> > vfio_device_put_kvm(device);
> > @@ -228,7 +236,7 @@ static struct file *vfio_device_open_file(struct vfio_device
> *device)
> > goto err_out;
> > }
> >
> > - ret = vfio_device_group_open(device);
> > + ret = vfio_df_group_open(df);
> > if (ret)
> > goto err_free;
> >
> > @@ -260,7 +268,7 @@ static struct file *vfio_device_open_file(struct vfio_device
> *device)
> > return filep;
> >
> > err_close_device:
> > - vfio_device_group_close(device);
> > + vfio_df_group_close(df);
> > err_free:
> > kfree(df);
> > err_out:
> > diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h
> > index 69e1a0692b06..f9eb52eb9ed7 100644
> > --- a/drivers/vfio/vfio.h
> > +++ b/drivers/vfio/vfio.h
> > @@ -20,13 +20,13 @@ struct vfio_device_file {
> > struct vfio_device *device;
> > spinlock_t kvm_ref_lock; /* protect kvm field */
> > struct kvm *kvm;
> > + struct iommufd_ctx *iommufd; /* protected by struct vfio_device_set::lock */
> > };
> >
> > void vfio_device_put_registration(struct vfio_device *device);
> > bool vfio_device_try_get_registration(struct vfio_device *device);
> > -int vfio_device_open(struct vfio_device *device, struct iommufd_ctx *iommufd);
> > -void vfio_device_close(struct vfio_device *device,
> > - struct iommufd_ctx *iommufd);
> > +int vfio_df_open(struct vfio_device_file *df);
> > +void vfio_df_close(struct vfio_device_file *df);
> > struct vfio_device_file *
> > vfio_allocate_device_file(struct vfio_device *device);
> >
> > @@ -91,7 +91,7 @@ void vfio_device_group_register(struct vfio_device *device);
> > void vfio_device_group_unregister(struct vfio_device *device);
> > int vfio_device_group_use_iommu(struct vfio_device *device);
> > void vfio_device_group_unuse_iommu(struct vfio_device *device);
> > -void vfio_device_group_close(struct vfio_device *device);
> > +void vfio_df_group_close(struct vfio_device_file *df);
> > struct vfio_group *vfio_group_from_file(struct file *file);
> > bool vfio_group_enforced_coherent(struct vfio_group *group);
> > void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm);
> > diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
> > index 8ef9210ad2aa..a3c5817fc545 100644
> > --- a/drivers/vfio/vfio_main.c
> > +++ b/drivers/vfio/vfio_main.c
> > @@ -434,9 +434,10 @@ vfio_allocate_device_file(struct vfio_device *device)
> > return df;
> > }
> >
> > -static int vfio_device_first_open(struct vfio_device *device,
> > - struct iommufd_ctx *iommufd)
> > +static int vfio_device_first_open(struct vfio_device_file *df)
> > {
> > + struct vfio_device *device = df->device;
> > + struct iommufd_ctx *iommufd = df->iommufd;
> > int ret;
> >
> > lockdep_assert_held(&device->dev_set->lock);
> > @@ -468,9 +469,11 @@ static int vfio_device_first_open(struct vfio_device *device,
> > return ret;
> > }
> >
> > -static void vfio_device_last_close(struct vfio_device *device,
> > - struct iommufd_ctx *iommufd)
> > +static void vfio_device_last_close(struct vfio_device_file *df)
>
> Shouldn't these now be vfio_df_... functions too? Thanks,

Yes. vfio_device_first_open() and vfio_device_last_close() should be
named like vfio_df...()

Regards,
Yi Liu

>
> > {
> > + struct vfio_device *device = df->device;
> > + struct iommufd_ctx *iommufd = df->iommufd;
> > +
> > lockdep_assert_held(&device->dev_set->lock);
> >
> > if (device->ops->close_device)
> > @@ -482,15 +485,16 @@ static void vfio_device_last_close(struct vfio_device *device,
> > module_put(device->dev->driver->owner);
> > }
> >
> > -int vfio_device_open(struct vfio_device *device, struct iommufd_ctx *iommufd)
> > +int vfio_df_open(struct vfio_device_file *df)
> > {
> > + struct vfio_device *device = df->device;
> > int ret = 0;
> >
> > lockdep_assert_held(&device->dev_set->lock);
> >
> > device->open_count++;
> > if (device->open_count == 1) {
> > - ret = vfio_device_first_open(device, iommufd);
> > + ret = vfio_device_first_open(df);
> > if (ret)
> > device->open_count--;
> > }
> > @@ -498,14 +502,15 @@ int vfio_device_open(struct vfio_device *device, struct
> iommufd_ctx *iommufd)
> > return ret;
> > }
> >
> > -void vfio_device_close(struct vfio_device *device,
> > - struct iommufd_ctx *iommufd)
> > +void vfio_df_close(struct vfio_device_file *df)
> > {
> > + struct vfio_device *device = df->device;
> > +
> > lockdep_assert_held(&device->dev_set->lock);
> >
> > vfio_assert_device_open(device);
> > if (device->open_count == 1)
> > - vfio_device_last_close(device, iommufd);
> > + vfio_device_last_close(df);
> > device->open_count--;
> > }
> >
> > @@ -550,7 +555,7 @@ static int vfio_device_fops_release(struct inode *inode, struct
> file *filep)
> > struct vfio_device_file *df = filep->private_data;
> > struct vfio_device *device = df->device;
> >
> > - vfio_device_group_close(device);
> > + vfio_df_group_close(df);
> >
> > vfio_device_put_registration(device);
> >