• Keith Packard's avatar
    Add RandR leases with modesetting driver support [v6] · e4e34476
    Keith Packard authored
    This adds support for RandR CRTC/Output leases through the modesetting
    driver, creating a lease using new kernel infrastructure and returning
    that to a client through an fd which will have access to only those
    v2:	Restore CRTC mode when leases terminate
    	When a lease terminates for a crtc we have saved data for, go
    	ahead and restore the saved mode.
    v3:	Report RR_Rotate_0 rotations for leased crtcs.
    	Ignore leased CRTCs when selecting screen size.
    	Stop leasing encoders, the kernel doesn't do that anymore.
    	Turn off crtc->enabled while leased so that modesetting
    	ignores them.
    	Check lease status before calling any driver mode functions
    	When starting a lease, mark leased CRTCs as disabled and hide
    	their cursors. Also, check to see if there are other
    	non-leased CRTCs which are driving leased Outputs and mark
    	them as disabled as well. Sometimes an application will lease
    	an idle crtc instead of the one already associated with the
    	leased output.
    	When terminating a lease, reset any CRTCs which are driving
    	outputs that are no longer leased so that they start working
    	This required splitting the DIX level lease termination code
    	into two pieces, one to remove the lease from the system
    	(RRLeaseTerminated) and a new function that frees the lease
    	data structure (RRLeaseFree).
    v4:	Report RR_Rotate_0 rotation for leased crtcs.
    v5: Terminate all leases on server reset.
    	Leases hang around after the associated client exits so that
    	the client doesn't need to occupy an X server client slot and
    	consume a file descriptor once it has gotten the output
    	resources necessary.
    	Any leases still hanging around when the X server resets or
    	shuts down need to be cleaned up by calling the kernel to
    	terminate the lease and freeing any DIX structures.
    	Note that we cannot simply use the existing
    	drmmode_terminate_lease function on each lease as that wants
    	to also reset the video mode, and during server shut down that
       modesetting: Validate leases on VT enter
    	The kernel doesn't allow any master ioctls to run when another
    	VT is active, including simple things like listing the active
    	leases. To deal with that, we check the list of leases
    	whenever the X server VT is activated.
       xfree86: hide disabled cursors when resetting after lease termination
    	The lessee may well have played with cursors and left one
    	active on our screen. Just tell the kernel to turn it off.
    v6:	Add meson build infrastructure
    [Also bumped libdrm requirement - ajax]
    Signed-off-by: Keith Packard's avatarKeith Packard <keithp@keithp.com>
    Reviewed-by: Adam Jackson's avatarAdam Jackson <ajax@redhat.com>
rrscreen.c 33.8 KB