drivers/gpu/drm/nouveau/nvkm/subdev/bar/g84.c

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/nouveau/nvkm/subdev/bar/g84.c

Extension

.c

Size

2156 bytes

Lines

64

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

• nv50.h
• subdev/timer.h

Detected Declarations

• function files
• function g84_bar_new

Annotated Snippet

#include "nv50.h"

#include <subdev/timer.h>

void
g84_bar_flush(struct nvkm_bar *bar)
{
	struct nvkm_device *device = bar->subdev.device;
	unsigned long flags;
	spin_lock_irqsave(&bar->lock, flags);
	nvkm_wr32(device, 0x070000, 0x00000001);
	nvkm_msec(device, 2000,
		if (!(nvkm_rd32(device, 0x070000) & 0x00000002))
			break;
	);
	spin_unlock_irqrestore(&bar->lock, flags);
}

static const struct nvkm_bar_func
g84_bar_func = {
	.dtor = nv50_bar_dtor,
	.oneinit = nv50_bar_oneinit,
	.init = nv50_bar_init,
	.bar1.init = nv50_bar_bar1_init,
	.bar1.fini = nv50_bar_bar1_fini,
	.bar1.wait = nv50_bar_bar1_wait,
	.bar1.vmm = nv50_bar_bar1_vmm,
	.bar2.init = nv50_bar_bar2_init,
	.bar2.fini = nv50_bar_bar2_fini,
	.bar2.wait = nv50_bar_bar1_wait,
	.bar2.vmm = nv50_bar_bar2_vmm,
	.flush = g84_bar_flush,
};

int
g84_bar_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
	    struct nvkm_bar **pbar)
{
	return nv50_bar_new_(&g84_bar_func, device, type, inst, 0x200, pbar);
}

Annotation

• Immediate include surface: `nv50.h`, `subdev/timer.h`.
• Detected declarations: `function files`, `function g84_bar_new`.
• 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.