[Intel-gfx] [PATCH v9 07/25] vfio: Pass struct vfio_device_file * to vfio_device_open/close()
Eric Auger
eric.auger at redhat.com
Thu Apr 6 12:43:18 UTC 2023
Hi Yi,
On 4/1/23 17:18, Yi Liu wrote:
> This avoids passing too much parameters in multiple functions.
> Reviewed-by: Kevin Tian <kevin.tian at intel.com>
> Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>
> Tested-by: Terrence Xu <terrence.xu at intel.com>
> Tested-by: Nicolin Chen <nicolinc at nvidia.com>
> Tested-by: Matthew Rosato <mjrosato at linux.ibm.com>
> Tested-by: Yanting Jiang <yanting.jiang at intel.com>
> Signed-off-by: Yi Liu <yi.l.liu at 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 4f937ebaf6f7..9a7b2765eef6 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_device_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_device_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_device_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_device_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_device_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_device_group_close(df);
> err_free:
> kfree(df);
> err_out:
> diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h
> index e4672d91a6f7..cffc08f5a6f1 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_device_open(struct vfio_device_file *df);
> +void vfio_device_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_device_group_close(struct vfio_device_file *df);
> struct vfio_group *vfio_group_from_file(struct file *file);
> bool vfio_group_has_dev(struct vfio_group *group, struct vfio_device *device);
> bool vfio_group_enforced_coherent(struct vfio_group *group);
> diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
> index cb543791b28b..2ea6cb6d03c7 100644
> --- a/drivers/vfio/vfio_main.c
> +++ b/drivers/vfio/vfio_main.c
> @@ -419,9 +419,10 @@ 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);
> @@ -453,9 +454,11 @@ 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)
> {
> + struct vfio_device *device = df->device;
> + struct iommufd_ctx *iommufd = df->iommufd;
> +
> lockdep_assert_held(&device->dev_set->lock);
>
> if (device->ops->close_device)
> @@ -467,15 +470,16 @@ 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_device_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--;
> }
> @@ -483,14 +487,15 @@ 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_device_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--;
> }
>
> @@ -535,7 +540,7 @@ 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_device_group_close(df);
>
> vfio_device_put_registration(device);
>
Maybe it reduces the number of parameters but the diffstat shows it does
not really simplify the code overall. I am not really sure it was worth
and the df->iommufd pre and post-setting is not really nice looking to me.
But well it others are OK ...
Reviewed-by: Eric Auger <eric.auger at redhat.com>
Thanks
Eric
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