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GPU: detects max PCI gen & link width

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This commit is contained in:
Carter Li
2026-06-13 15:20:40 +08:00
committed by 李通洲
parent 55eb3c59d4
commit 4e44c0520b
22 changed files with 252 additions and 50 deletions
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src/detection/gpu/gpu_linux.c
+31
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@@ -368,6 +368,7 @@ static const char* detectPci(const FFGPUOptions* options, FFlist* gpus, FFstrbuf
gpu->dedicated.total = gpu->dedicated.used = gpu->shared.total = gpu->shared.used = FF_GPU_VMEM_SIZE_UNSET;
gpu->deviceId = ffGPUPciAddr2Id(pciDomain, pciBus, pciDevice, pciFunc);
gpu->frequency = FF_GPU_FREQUENCY_UNSET;
gpu->pcieGen = gpu->pcieLanes = FF_GPU_PCI_INFO_UNSET;
char drmKeyBuffer[8];
if (!drmKey) {
@@ -393,6 +394,36 @@ static const char* detectPci(const FFGPUOptions* options, FFlist* gpus, FFstrbuf
pciDetectDriver(&gpu->driver, deviceDir, buffer, drmKey);
ffStrbufSubstrBefore(deviceDir, drmDirPathLength);
ffStrbufAppendS(deviceDir, "/max_link_speed");
if (ffReadFileBuffer(deviceDir->chars, buffer)) {
int32_t maxLinkSpeed = (int32_t) ffStrbufToSInt(buffer, FF_GPU_PCI_INFO_UNSET);
if (maxLinkSpeed >= 64) {
gpu->pcieGen = 6;
} else if (maxLinkSpeed >= 32) {
gpu->pcieGen = 5;
} else if (maxLinkSpeed >= 16) {
gpu->pcieGen = 4;
} else if (maxLinkSpeed >= 8) {
gpu->pcieGen = 3;
} else if (maxLinkSpeed >= 5) {
gpu->pcieGen = 2;
} else if (maxLinkSpeed >= 2) { // 2.5
gpu->pcieGen = 1;
}
}
ffStrbufSubstrBefore(deviceDir, drmDirPathLength);
if (gpu->pcieGen != FF_GPU_PCI_INFO_UNSET) {
ffStrbufAppendS(deviceDir, "/max_link_width");
if (ffReadFileBuffer(deviceDir->chars, buffer)) {
int32_t maxLinkWidth = (int32_t) ffStrbufToSInt(buffer, FF_GPU_PCI_INFO_UNSET);
if (maxLinkWidth > 0 && maxLinkWidth < 255) { // kernel returns 255 if the value is unknown
gpu->pcieLanes = (uint16_t) maxLinkWidth;
}
}
ffStrbufSubstrBefore(deviceDir, drmDirPathLength);
}
if (gpu->vendor.chars == FF_GPU_VENDOR_NAME_AMD) {
bool ok = false;
if (drmKey && options->driverSpecific) {