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

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/bios/perf.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/bios/perf.c
Extension
.c
Size
6073 bytes
Lines
217
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.

Dependency Surface

Detected Declarations

Annotated Snippet

if (bit_P.version <= 2) {
			perf = nvbios_rd32(bios, bit_P.offset + 0);
			if (perf) {
				*ver = nvbios_rd08(bios, perf + 0);
				*hdr = nvbios_rd08(bios, perf + 1);
				if (*ver >= 0x40 && *ver < 0x41) {
					*cnt = nvbios_rd08(bios, perf + 5);
					*len = nvbios_rd08(bios, perf + 2);
					*snr = nvbios_rd08(bios, perf + 4);
					*ssz = nvbios_rd08(bios, perf + 3);
					return perf;
				} else
				if (*ver >= 0x20 && *ver < 0x40) {
					*cnt = nvbios_rd08(bios, perf + 2);
					*len = nvbios_rd08(bios, perf + 3);
					*snr = nvbios_rd08(bios, perf + 4);
					*ssz = nvbios_rd08(bios, perf + 5);
					return perf;
				}
			}
		}
	}

	if (bios->bmp_offset) {
		if (nvbios_rd08(bios, bios->bmp_offset + 6) >= 0x25) {
			perf = nvbios_rd16(bios, bios->bmp_offset + 0x94);
			if (perf) {
				*hdr = nvbios_rd08(bios, perf + 0);
				*ver = nvbios_rd08(bios, perf + 1);
				*cnt = nvbios_rd08(bios, perf + 2);
				*len = nvbios_rd08(bios, perf + 3);
				*snr = 0;
				*ssz = 0;
				return perf;
			}
		}
	}

	return 0;
}

u32
nvbios_perf_entry(struct nvkm_bios *bios, int idx,
		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
{
	u8  snr, ssz;
	u32 perf = nvbios_perf_table(bios, ver, hdr, cnt, len, &snr, &ssz);
	if (perf && idx < *cnt) {
		perf = perf + *hdr + (idx * (*len + (snr * ssz)));
		*hdr = *len;
		*cnt = snr;
		*len = ssz;
		return perf;
	}
	return 0;
}

u32
nvbios_perfEp(struct nvkm_bios *bios, int idx,
	      u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_perfE *info)
{
	u32 perf = nvbios_perf_entry(bios, idx, ver, hdr, cnt, len);
	memset(info, 0x00, sizeof(*info));
	info->pstate = nvbios_rd08(bios, perf + 0x00);
	switch (!!perf * *ver) {
	case 0x12:
	case 0x13:
	case 0x14:
		info->core     = nvbios_rd32(bios, perf + 0x01) * 10;
		info->memory   = nvbios_rd32(bios, perf + 0x05) * 20;
		info->fanspeed = nvbios_rd08(bios, perf + 0x37);
		if (*hdr > 0x38)
			info->voltage = nvbios_rd08(bios, perf + 0x38);
		break;
	case 0x21:
	case 0x23:
	case 0x24:
		info->fanspeed = nvbios_rd08(bios, perf + 0x04);
		info->voltage  = nvbios_rd08(bios, perf + 0x05);
		info->shader   = nvbios_rd16(bios, perf + 0x06) * 1000;
		info->core     = info->shader + (signed char)
				 nvbios_rd08(bios, perf + 0x08) * 1000;
		switch (bios->subdev.device->chipset) {
		case 0x49:
		case 0x4b:
			info->memory = nvbios_rd16(bios, perf + 0x0b) * 1000;
			break;
		default:
			info->memory = nvbios_rd16(bios, perf + 0x0b) * 2000;
			break;

Annotation

Implementation Notes