drivers/gpu/drm/nouveau/nvkm/subdev/bios/xpio.c

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/nouveau/nvkm/subdev/bios/xpio.c

Extension

.c

Size

2521 bytes

Lines

75

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

• subdev/bios.h
• subdev/bios/gpio.h
• subdev/bios/xpio.h

Detected Declarations

• function files
• function dcb_xpio_table
• function dcb_xpio_parse

Annotated Snippet

if (xpio) {
			*ver = nvbios_rd08(bios, data + 0x00);
			*hdr = nvbios_rd08(bios, data + 0x01);
			*cnt = nvbios_rd08(bios, data + 0x02);
			*len = nvbios_rd08(bios, data + 0x03);
			return xpio;
		}
	}
	return 0x0000;
}

u16
dcb_xpio_table(struct nvkm_bios *bios, u8 idx,
	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
{
	u16 data = dcb_xpiod_table(bios, ver, hdr, cnt, len);
	if (data && idx < *cnt) {
		u16 xpio = nvbios_rd16(bios, data + *hdr + (idx * *len));
		if (xpio) {
			*ver = nvbios_rd08(bios, data + 0x00);
			*hdr = nvbios_rd08(bios, data + 0x01);
			*cnt = nvbios_rd08(bios, data + 0x02);
			*len = nvbios_rd08(bios, data + 0x03);
			return xpio;
		}
	}
	return 0x0000;
}

u16
dcb_xpio_parse(struct nvkm_bios *bios, u8 idx,
	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_xpio *info)
{
	u16 data = dcb_xpio_table(bios, idx, ver, hdr, cnt, len);
	if (data && *len >= 6) {
		info->type = nvbios_rd08(bios, data + 0x04);
		info->addr = nvbios_rd08(bios, data + 0x05);
		info->flags = nvbios_rd08(bios, data + 0x06);
	}
	return 0x0000;
}

Annotation

• Immediate include surface: `subdev/bios.h`, `subdev/bios/gpio.h`, `subdev/bios/xpio.h`.
• Detected declarations: `function files`, `function dcb_xpio_table`, `function dcb_xpio_parse`.
• 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.