drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c

Extension

.c

Size

4682 bytes

Lines

207

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.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• priv.h
• agp.h
• core/option.h
• core/pci.h

Detected Declarations

• function files
• function nvkm_pci_rd32
• function nvkm_pci_wr08
• function nvkm_pci_wr32
• function nvkm_pci_mask
• function nvkm_pci_rom_shadow
• function nvkm_pci_fini
• function nvkm_pci_preinit
• function nvkm_pci_oneinit
• function nvkm_pci_init
• function nvkm_pci_dtor
• function nvkm_pci_new_

Annotated Snippet

switch (device->chipset) {
		case 0xaa:
			/* reported broken, nv also disable it */
			break;
		default:
			pci->msi = true;
			break;
		}
	}

#ifdef __BIG_ENDIAN
	pci->msi = false;
#endif

	pci->msi = nvkm_boolopt(device->cfgopt, "NvMSI", pci->msi);
	if (pci->msi && func->msi_rearm) {
		pci->msi = pci_enable_msi(pci->pdev) == 0;
		if (pci->msi)
			nvkm_debug(&pci->subdev, "MSI enabled\n");
	} else {
		pci->msi = false;
	}

	return 0;
}

Annotation

• Immediate include surface: `priv.h`, `agp.h`, `core/option.h`, `core/pci.h`.
• Detected declarations: `function files`, `function nvkm_pci_rd32`, `function nvkm_pci_wr08`, `function nvkm_pci_wr32`, `function nvkm_pci_mask`, `function nvkm_pci_rom_shadow`, `function nvkm_pci_fini`, `function nvkm_pci_preinit`, `function nvkm_pci_oneinit`, `function nvkm_pci_init`.
• Atlas domain: Driver Families / drivers/gpu.
• Implementation status: source implementation candidate.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.