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EVO CLASSES
The NVIDIA "EVO" Display Engine was introduced in NV50, and has been
incrementally updated in GPUs since then.
EVO consists of several channels:
"core": This channel is used to perform modesets, as well as things
such as manage the LUT, and cursor properties (other than
position). It has GPU scope.
"base": This channel is intended to be used for OpenGL SwapBuffers
flipping. There is one base channel per head.
"overlay": This channel is intended to be used for flipping the
overlay. There is one overlay channel per head.
"overlay immediate": This channel is intended to be used to position
the overlay within the raster of the head. There is one
overlay immediate channel per head. Originally, it was
conceived that a display driver would position the overlay
in response to a window move, using the "overlay immediate"
channel, and a video driver would flip buffers using the
overlay channel.
"cursor": This channel is used to position the cursor. There is
one cursor channel per head. The cursor format and buffer
is specified through the core channel. It was originally
conceived that the management of cursor would be distributed
between the core and cursor channels in the same way that
overlay management is distributed between overlay and overlay
immediate channels. The cursor channel allows low-latency
cursor position updates, asynchronously to the core channel.
The "NVDisplay" Engine is new in Volta, and is a major improvement upon EVO.
The software interface consists of a set of channels as in EVO, but how those
channels can be used is more flexible.
"core": This channel is similar to EVO's core channel, except it does not
support programming a surface as a base layer.
"window": This channel replaces EVO's base and overlay channels. It is
designed support a superset of the capabilities of the earlier
channels, but in addition supports scaling, alpha blending, and
blend order, among other improvements. Windows are not inherently
bound to a head and must be bound explicitly with core channel
methods.
"window immediate": Like EVO's overlay immediate, this can be used to
position the corresponding window channel on the raster. Unlike
EVO's overlay immediate, this is a DMA channel to support
enqueuing more than one update at a time.
"cursor": This is similar to EVO's cursor channel. There is one cursor
per head.
There is a per-channel header file that defines the method interface to
each channel.
There are both a "class name" and a software class number that are
used to describe the combination of channel versions used together.
The table below describes which class name is used with which GPU,
and which channel header files are used with that class.
__________________________________________________________________________
Class Name: DISP010X
Software Class Number: 5070
Cursor Channel: cl507a.h
Overlay Immediate Channel: cl507b.h
Base Channel: cl507c.h
Core Channel: cl507d.h
Overlay Channel: cl507e.h
GPUs: nv50
__________________________________________________________________________
Class Name: DISP011X
Software Class Number: 8270
Cursor Channel: cl827a.h
Overlay Immediate Channel: cl827b.h
Base Channel: cl827c.h
Core Channel: cl827d.h
Overlay Channel: cl827e.h
GPUs: g84, g86, g92
__________________________________________________________________________
Class Name: DISP012X
Software Class Number: 8370
Cursor Channel: cl827a.h
Overlay Immediate Channel: cl827b.h
Base Channel: cl837c.h
Core Channel: cl837d.h
Overlay Channel: cl837e.h
GPUs: gt200
__________________________________________________________________________
Class Name: DISP014X
Software Class Number: 8870
Cursor Channel: cl827a.h
Overlay Immediate Channel: cl827b.h
Base Channel: cl837c.h
Core Channel: cl887d.h
Overlay Channel: cl837e.h
GPUs: g94, g96, g98, mcp7x
__________________________________________________________________________
Class Name: DISP015X
Software Class Number: 8570
Cursor Channel: cl857a.h
Overlay Immediate Channel: cl857b.h
Base Channel: cl857c.h
Core Channel: cl857d.h
Overlay Channel: cl857e.h
GPUs: gt215, gt216, gt218, mcp89
gf100, gf104, gf106, gf114, gf116, gf108
__________________________________________________________________________
Class Name: DISP020X
Software Class Number: 9070
Cursor Channel: cl907a.h
Overlay Immediate Channel: cl907b.h
Base Channel: cl907c.h
Core Channel: cl907d.h
Overlay Channel: cl907e.h
GPUs: gf119
__________________________________________________________________________
Class Name: DISP021X
Software Class Number: 9170
Cursor Channel: cl917a.h
Overlay Immediate Channel: cl917b.h
Base Channel: cl917c.h
Core Channel: cl917d.h
Overlay Channel: cl917e.h
GPUs: gk104, gk106, gk107
__________________________________________________________________________
Class Name: DISP022X
Software Class Number: 9270
Cursor Channel: cl917a.h
Overlay Immediate Channel: cl917b.h
Base Channel: cl927c.h
Core Channel: cl927d.h
Overlay Channel: cl917e.h
GPUs: gk110, gk208
__________________________________________________________________________
Class Name: DISP024X
Software Class Number: 9470
Cursor Channel: cl917a.h
Overlay Immediate Channel: cl917b.h
Base Channel: cl927c.h
Core Channel: cl947d.h
Overlay Channel: cl917e.h
GPUs: gm107, gm108
__________________________________________________________________________
Class Name: DISP025X
Software Class Number: 9570
Cursor Channel: cl917a.h
Overlay Immediate Channel: cl917b.h
Base Channel: cl927c.h
Core Channel: cl957d.h
Overlay Channel: cl917e.h
GPUs: gm200, gm204, gm206
__________________________________________________________________________
Class Name: DISP027X
Software Class Number: 9770
Cursor Channel: cl917a.h
Overlay Immediate Channel: cl917b.h
Base Channel: cl927c.h
Core Channel: cl977d.h
Overlay Channel: cl917e.h
GPUs: gp100
__________________________________________________________________________
Class Name: DISP028X
Software Class Number: 9870
Cursor Channel: cl917a.h
Overlay Immediate Channel: cl917b.h
Base Channel: cl927c.h
Core Channel: cl987d.h
Overlay Channel: cl917e.h
GPUs: gp102, gp104, gp106, gp107, gp108
__________________________________________________________________________
Class Name: NVD_20
Software Class Number: C370
Cursor Channel: clc37a.h
Window Immediate Channel: clc37b.h
Core Channel: clc37d.h
Window Channel: clc37e.h
GPUs: gv100
__________________________________________________________________________
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