Date: Thu, 5 Nov 2015 21:33:15 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r290416 - head/sys/dev/cxgbe Message-ID: <201511052133.tA5LXF0n039093@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: jhb Date: Thu Nov 5 21:33:15 2015 New Revision: 290416 URL: https://svnweb.freebsd.org/changeset/base/290416 Log: Chelsio T5 chips do not properly echo the No Snoop and Relaxed Ordering attributes when replying to a TLP from a Root Port. As a workaround, disable No Snoop and Relaxed Ordering in the Root Port of each T5 adapter during attach so that CPU-initiated requests do not contain these flags. Note that this affects CPU-initiated requests to all devices under this root port. Reviewed by: np MFC after: 1 week Sponsored by: Chelsio Modified: head/sys/dev/cxgbe/t4_main.c Modified: head/sys/dev/cxgbe/t4_main.c ============================================================================== --- head/sys/dev/cxgbe/t4_main.c Thu Nov 5 21:27:25 2015 (r290415) +++ head/sys/dev/cxgbe/t4_main.c Thu Nov 5 21:33:15 2015 (r290416) @@ -573,6 +573,33 @@ t5_probe(device_t dev) return (ENXIO); } +static void +t5_attribute_workaround(device_t dev) +{ + device_t root_port; + uint32_t v; + + /* + * The T5 chips do not properly echo the No Snoop and Relaxed + * Ordering attributes when replying to a TLP from a Root + * Port. As a workaround, find the parent Root Port and + * disable No Snoop and Relaxed Ordering. Note that this + * affects all devices under this root port. + */ + root_port = pci_find_pcie_root_port(dev); + if (root_port == NULL) { + device_printf(dev, "Unable to find parent root port\n"); + return; + } + + v = pcie_adjust_config(root_port, PCIER_DEVICE_CTL, + PCIEM_CTL_RELAXED_ORD_ENABLE | PCIEM_CTL_NOSNOOP_ENABLE, 0, 2); + if ((v & (PCIEM_CTL_RELAXED_ORD_ENABLE | PCIEM_CTL_NOSNOOP_ENABLE)) != + 0) + device_printf(dev, "Disabled No Snoop/Relaxed Ordering on %s\n", + device_get_nameunit(root_port)); +} + static int t4_attach(device_t dev) { @@ -591,6 +618,8 @@ t4_attach(device_t dev) sc->dev = dev; TUNABLE_INT_FETCH("hw.cxgbe.debug_flags", &sc->debug_flags); + if ((pci_get_device(dev) & 0xff00) == 0x5400) + t5_attribute_workaround(dev); pci_enable_busmaster(dev); if (pci_find_cap(dev, PCIY_EXPRESS, &i) == 0) { uint32_t v;
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201511052133.tA5LXF0n039093>