sys/linux: dev_dri.txt updates (#3856)

* sys/linux: fix count_encoders

The count_encoders field gives the length of the encoders_ptr field, not
count_modes field.

* sys/linux: make modes_ptr array of drm_mode_modeinfo structures

The modes_ptr is actually some number of drm_mode_modeinfo structures,
so make the array be properly sized.

* sys/linux: make drm_crtc_id into a resource

Calling the DRM_IOCTL_MODE_GETRESOURCES ioctl gets you available crtc
ids. Make a resource for drm_crtc_id and use it instead of trying to
guess the random number. Mark ioctl$DRM_IOCTL_MODE_GETPLANE as inout as
well so that we know it outputs a drm_crtc_id.

* sys/linux: make encoder_id into a resource

Make a resource for the encoder_id so that the
DRM_IOCTL_MODE_GETCONNECTOR ioctl can generate encoder ids. Otherwise
you have to hope that the random int32 matches the allocated number from
the kernel's idr.

* sys/linux: make prop_id into a resource

The DRM_IOCTL_MODE_GETCONNECTOR can be used to get available properties
and their ids. Otherwise you have to hope that the random int32 matches
the allocated number from the kernel's idr. Make this into a resource so
it can be used in other places as a known value.

* sys/linux: make connector_id into a resource

Use the DRM_IOCTL_GETRESOURCES ioctl to get the connector id. Make the
id into a resource so it can be used throughout instead of guessing the
int32. Similarly mark DRM_IOCTL_GETRESOURCES pointer argument as 'inout'
because the whole structure is an output that is used to get the
resources associated with a card (or fd_dri).

* sys/linux: make fb_id into a resource

Use the DRM_IOCTL_GETRESOURCES ioctl to get the framebuffer id. Make the
id into a resource so it can be used throughout instead of guessing the
int32.

* sys/linux: make a resource for base drm mode object

The drm UAPI treats an object id as generic int32 in the
DRM_IOCTL_MODE_OBJ_GETPROPERTIES ioctl. You use the id along with the
type field to find the properties associated with a particular object.
Make the object id be the base int32 that all other drm mode objects
inherit from.

* sys/linux: split DRM get/set crtc ioctls into two

These ioctls use the same structure but in the "get" case everything
besides the crtc_id is an output and the set_connectors_ptr is unused.
Split the ioctls into two so we can describe the differences.

* sys/linux: drm's DRM_IOCTL_VERSION takes an inout pointer

This is actually an inout pointer. Mark it as such although this
probably won't really do much because no resource is created by this
ioctl.

* sys/linux: indicate in and out for DRM_IOCTL_IRQ_BUSID

Mark the structure argument to this ioctl as inout and indicate that the
irq is the only element that is an output. This clarifies how this ioctl
works, although it is deprecated and is largely useless.

* sys/linux: handles for drm_mode_fb_cmd2 are GEM handles

The handles member of drm_mode_fb_cmd2 is an array of 4 drm_gem_handle
resources. Mark it as such.

* sys/linux: mark pointer to DRM_IOCTL_MODE_GETPLANERESOURCES inout

This ioctl is inout, because it gets the number of planes and their ids.

* sys/linux: add DRM_IOCTL_MODE_GETFB2 ioctl

This ioctl is missing from dev_dri.txt

0 files changed, 0 insertions, 0 deletions