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 __________________________________________________________________________