Re: [PATCH 6/6] drm: Add four ioctls for managing drm mode object leases [v3]

[Dave Airlie]

On 5 October 2017 at 13:17, Dave Airlie <airlied@xxxxxxxxx> wrote:
>> ---
>>  drivers/gpu/drm/drm_ioctl.c |   4 +
>>  drivers/gpu/drm/drm_lease.c | 270 ++++++++++++++++++++++++++++++++++++++++++++
>>  include/drm/drm_lease.h     |  12 ++
>>  include/uapi/drm/drm.h      |   5 +
>>  include/uapi/drm/drm_mode.h |  64 +++++++++++
>>  5 files changed, 355 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
>> index a5a259964c7d..0a43e82d3f06 100644
>> --- a/drivers/gpu/drm/drm_ioctl.c
>> +++ b/drivers/gpu/drm/drm_ioctl.c
>> @@ -657,6 +657,10 @@ static const struct drm_ioctl_desc drm_ioctls[] = {
>>                       DRM_UNLOCKED|DRM_RENDER_ALLOW),
>>         DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl,
>>                       DRM_UNLOCKED|DRM_RENDER_ALLOW),
>> +       DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
>> +       DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
>> +       DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
>> +       DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
>>  };
>>
>>  #define DRM_CORE_IOCTL_COUNT   ARRAY_SIZE( drm_ioctls )
>> diff --git a/drivers/gpu/drm/drm_lease.c b/drivers/gpu/drm/drm_lease.c
>> index a8bd4bdd2977..f233d8b488f2 100644
>> --- a/drivers/gpu/drm/drm_lease.c
>> +++ b/drivers/gpu/drm/drm_lease.c
>> @@ -23,6 +23,8 @@
>>  #define drm_for_each_lessee(lessee, lessor) \
>>         list_for_each_entry((lessee), &(lessor)->lessees, lessee_list)
>>
>> +static uint64_t drm_lease_idr_object;
>
> What is this for? ^^
>
>> +               ret = idr_alloc(&leases, &drm_lease_idr_object , object_id, object_id + 1, GFP_KERNEL);
>
> You can just pass NULL here.
>

Just read the comment, this smells a bit of black magic, I'll spend
some time staring at it :-)

Dave.