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| author | kmacy <kmacy@FreeBSD.org> | 2007-03-23 20:18:07 +0000 |
|---|---|---|
| committer | kmacy <kmacy@FreeBSD.org> | 2007-03-23 20:18:07 +0000 |
| commit | 4bfdd681e77c880870040f0cbd4d6b43933894df (patch) | |
| tree | 5a2f4dbedc6ff2e56097fc79570e80236643dbc5 /sys/dev | |
| parent | acede79cbae3ad5ac9c813b98547f46f97d26877 (diff) | |
| download | FreeBSD-src-4bfdd681e77c880870040f0cbd4d6b43933894df.zip FreeBSD-src-4bfdd681e77c880870040f0cbd4d6b43933894df.tar.gz | |
Check PCI-e link width to avoid foot shooting with 4x links
MFC after: 3 days
Diffstat (limited to 'sys/dev')
| -rw-r--r-- | sys/dev/cxgb/cxgb_main.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/sys/dev/cxgb/cxgb_main.c b/sys/dev/cxgb/cxgb_main.c index bb4d0cf..17ea53c 100644 --- a/sys/dev/cxgb/cxgb_main.c +++ b/sys/dev/cxgb/cxgb_main.c @@ -303,13 +303,29 @@ cxgb_controller_attach(device_t dev) device_t child; const struct adapter_info *ai; struct adapter *sc; - int i, msi_needed, msi_count = 0, error = 0; + int i, reg, msi_needed, msi_count = 0, error = 0; uint32_t vers; int port_qsets = 1; sc = device_get_softc(dev); sc->dev = dev; + /* find the PCIe link width and set max read request to 4KB*/ + if (pci_find_extcap(dev, PCIY_EXPRESS, ®) == 0) { + uint16_t lnk, pectl; + lnk = pci_read_config(dev, reg + 0x12, 2); + sc->link_width = (lnk >> 4) & 0x3f; + + pectl = pci_read_config(dev, reg + 0x8, 2); + pectl = (pectl & ~0x7000) | (5 << 12); + pci_write_config(dev, reg + 0x8, pectl, 2); + } + if (sc->link_width != 0 && sc->link_width <= 4) { + device_printf(sc->dev, + "PCIe x%ld Link, expect reduced performance\n", + sc->link_width); + } + pci_enable_busmaster(dev); /* |
