How arunkumarvp/linux works
Linux is the kernel at the center of a Linux operating system: it mediates hardware access and provides services used by applications and system software. This sample emphasizes asynchronous DMA, device-facing drivers, graphics engines, and s390 guarded-storage support rather than showing the whole kernel. The excerpted sources establish selected subsystem behavior and some DMA relationships; they do not expose a complete boot-to-userspace path or the internal wiring of many README-listed services, so those connections are not inferred here.
Main entry points: dmaengine.c DMAengine core · ccp-dmaengine.c CCP DMA · ptdma-dmaengine.c PTDMA · spi-axi-spi-engine.c SPI-Engine driver
Components 17
DMA services
- DMAengine core
drivers/dma/dmaengine.c - CCP DMA
drivers/crypto/ccp/ccp-dmaengine.c - PTDMA
drivers/dma/amd/ptdma/ptdma-dmaengine.c - IIO DMA buffer
drivers/iio/buffer/industrialio-buffer-dmaengine.c - Crypto engine
crypto/crypto_engine.c
Device interfaces
- SPI-Engine driver
drivers/spi/spi-axi-spi-engine.c - USB mass storage
drivers/usb/gadget/function/f_mass_storage.c - APU board GPIO
drivers/platform/x86/pcengines-apuv2.c
Graphics
- i915 engines
drivers/gpu/drm/i915/gt/intel_engine_cs.c - Xe engines
drivers/gpu/drm/xe/xe_hw_engine.c - Komeda pipeline
drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
Architecture support
- Guarded storage
arch/s390/kernel/guarded_storage.c - Alpha kernel support
arch/alpha/kernel/setup.c - ARC kernel support
arch/arc/kernel/setup.c - ARM kernel support
arch/arm/kernel/setup.c
Other components
- Kernel clients
- Hardware devices
Connections 20
- Kernel clients → DMAengine core: requests DMA
- CCP DMA → DMAengine core: registers channels
- PTDMA → DMAengine core: registers channels
- IIO DMA buffer → DMAengine core: requests transfers
- CCP DMA → Hardware devices: submits commands
- PTDMA → Hardware devices: performs passthrough
- Crypto engine → Kernel clients: queues requests
- SPI-Engine driver → Hardware devices: programs controller
- Kernel clients → SPI-Engine driver: submits messages
- USB mass storage → Hardware devices: serves USB storage
- Kernel clients → USB mass storage: configures LUNs
- APU board GPIO → Hardware devices: exposes GPIO
- i915 engines → Hardware devices: controls engines
- Xe engines → Hardware devices: configures engines
- Komeda pipeline → Hardware devices: updates pipeline
- Kernel clients → Guarded storage: invokes syscall
- Guarded storage → Hardware devices: loads control state
- Kernel clients → Alpha kernel support: runs on
- Kernel clients → ARC kernel support: runs on
- Kernel clients → ARM kernel support: runs on