drm/i915 Intel GFX Driver
The drm/i915 driver supports all (with the exception of some very early models) integrated GFX chipsets with both Intel display and rendering blocks. This excludes a set of SoC platforms with an SGX rendering unit, those have basic support through the gma500 drm driver.
Core Driver Infrastructure
This section covers core driver infrastructure used by both the display and the GEM parts of the driver.
Runtime Power Management
Interrupt Handling
Intel GVT-g Guest Support(vGPU)
Display Hardware Handling
This section covers everything related to the display hardware including the mode setting infrastructure, plane, sprite and cursor handling and display, output probing and related topics.
Mode Setting Infrastructure
The i915 driver is thus far the only DRM driver which doesn't use the common DRM helper code to implement mode setting sequences. Thus it has its own tailor-made infrastructure for executing a display configuration change.
Frontbuffer Tracking
Display FIFO Underrun Reporting
Plane Configuration
This section covers plane configuration and composition with the primary plane, sprites, cursors and overlays. This includes the infrastructure to do atomic vsync'ed updates of all this state and also tightly coupled topics like watermark setup and computation, framebuffer compression and panel self refresh.
Atomic Plane Helpers
Output Probing
This section covers output probing and related infrastructure like the hotplug interrupt storm detection and mitigation code. Note that the i915 driver still uses most of the common DRM helper code for output probing, so those sections fully apply.
Hotplug
High Definition Audio
Panel Self Refresh PSR (PSR/SRD)
Frame Buffer Compression (FBC)
Display Refresh Rate Switching (DRRS)
DPIO
CSR firmware support for DMC
Video BIOS Table (VBT)
Memory Management and Command Submission
This sections covers all things related to the GEM implementation in the i915 driver.
Batchbuffer Parsing
Batchbuffer Pools
Logical Rings, Logical Ring Contexts and Execlists
Global GTT views
GTT Fences and Swizzling
Global GTT Fence Handling
Hardware Tiling and Swizzling Details
Object Tiling IOCTLs
Buffer Object Eviction
This section documents the interface functions for evicting buffer objects to make space available in the virtual gpu address spaces. Note that this is mostly orthogonal to shrinking buffer objects caches, which has the goal to make main memory (shared with the gpu through the unified memory architecture) available.
Buffer Object Memory Shrinking
This section documents the interface function for shrinking memory usage of buffer object caches. Shrinking is used to make main memory available. Note that this is mostly orthogonal to evicting buffer objects, which has the goal to make space in gpu virtual address spaces.
GuC
GuC-specific firmware loader
GuC-based command submission
GuC Firmware Layout
Tracing
This sections covers all things related to the tracepoints implemented in the i915 driver.