drivers/gpu/drm/nouveau/include/nvkm/subdev/bar.h

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/nouveau/include/nvkm/subdev/bar.h

Extension

.h

Size

1441 bytes

Lines

38

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• core/subdev.h

Detected Declarations

• struct nvkm_vma
• struct nvkm_bar

Annotated Snippet

struct nvkm_bar {
	const struct nvkm_bar_func *func;
	struct nvkm_subdev subdev;

	spinlock_t lock;
	bool bar2;

	void __iomem *flushBAR2PhysMode;
	struct nvkm_memory *flushFBZero;
	void __iomem *flushBAR2;

	/* whether the BAR supports to be ioremapped WC or should be uncached */
	bool iomap_uncached;
};

struct nvkm_vmm *nvkm_bar_bar1_vmm(struct nvkm_device *);
void nvkm_bar_bar1_reset(struct nvkm_device *);
void nvkm_bar_bar2_init(struct nvkm_device *);
void nvkm_bar_bar2_fini(struct nvkm_device *);
void nvkm_bar_bar2_reset(struct nvkm_device *);
struct nvkm_vmm *nvkm_bar_bar2_vmm(struct nvkm_device *);
void nvkm_bar_flush(struct nvkm_bar *);

int nv50_bar_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_bar **);
int g84_bar_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_bar **);
int gf100_bar_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_bar **);
int gk20a_bar_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_bar **);
int gm107_bar_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_bar **);
int gm20b_bar_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_bar **);
int tu102_bar_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_bar **);
#endif

Annotation

• Immediate include surface: `core/subdev.h`.
• Detected declarations: `struct nvkm_vma`, `struct nvkm_bar`.
• Atlas domain: Driver Families / drivers/gpu.
• Implementation status: source implementation candidate.

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.