drivers/gpu/drm/msm/adreno/a5xx_preempt.c

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/msm/adreno/a5xx_preempt.c

Extension

.c

Size

9345 bytes

Lines

330

Domain

Driver Families

Bucket

drivers/gpu

Inferred role

Driver Families: implementation source

Status

source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• msm_gem.h
• a5xx_gpu.h

Detected Declarations

• function try_preempt_state
• function set_preempt_state
• function update_wptr
• function a5xx_preempt_timer
• function a5xx_preempt_trigger
• function a5xx_preempt_irq
• function a5xx_preempt_hw_init
• function preempt_init_ring
• function a5xx_preempt_fini
• function a5xx_preempt_init

Annotated Snippet

if (preempt_init_ring(a5xx_gpu, gpu->rb[i])) {
			/*
			 * On any failure our adventure is over. Clean up and
			 * set nr_rings to 1 to force preemption off
			 */
			a5xx_preempt_fini(gpu);
			gpu->nr_rings = 1;

			return;
		}
	}

	spin_lock_init(&a5xx_gpu->preempt_start_lock);
	timer_setup(&a5xx_gpu->preempt_timer, a5xx_preempt_timer, 0);
}

Annotation

• Immediate include surface: `msm_gem.h`, `a5xx_gpu.h`.
• Detected declarations: `function try_preempt_state`, `function set_preempt_state`, `function update_wptr`, `function a5xx_preempt_timer`, `function a5xx_preempt_trigger`, `function a5xx_preempt_irq`, `function a5xx_preempt_hw_init`, `function preempt_init_ring`, `function a5xx_preempt_fini`, `function a5xx_preempt_init`.
• Atlas domain: Driver Families / drivers/gpu.
• Implementation status: source implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.