Date: Sat, 9 Jul 2016 23:22:44 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r302508 - head/sys/dev/ntb/ntb_hw Message-ID: <201607092322.u69NMiu3054408@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: mav Date: Sat Jul 9 23:22:44 2016 New Revision: 302508 URL: https://svnweb.freebsd.org/changeset/base/302508 Log: Disable SB01BASE_LOCKUP workaround when split BARs disabled. For some reason hack with sending MSI-X interrupts by writing to remote LAPIC memory works only for 32-bit BARs, that are available only if split BARs mode is enabled in BIOS. If it is not, complain loudly and fall back to less efficient workaround. Modified: head/sys/dev/ntb/ntb_hw/ntb_hw.c Modified: head/sys/dev/ntb/ntb_hw/ntb_hw.c ============================================================================== --- head/sys/dev/ntb/ntb_hw/ntb_hw.c Sat Jul 9 22:41:21 2016 (r302507) +++ head/sys/dev/ntb/ntb_hw/ntb_hw.c Sat Jul 9 23:22:44 2016 (r302508) @@ -450,7 +450,7 @@ ntb_vm_memattr_to_str(vm_memattr_t pat) } } -static int g_ntb_msix_idx = 0; +static int g_ntb_msix_idx = 1; SYSCTL_INT(_hw_ntb, OID_AUTO, msix_mw_idx, CTLFLAG_RDTUN, &g_ntb_msix_idx, 0, "Use this memory window to access the peer MSIX message complex on " "certain Xeon-based NTB systems, as a workaround for a hardware errata. " @@ -1440,6 +1440,16 @@ ntb_detect_xeon(struct ntb_softc *ntb) if ((ppd & XEON_PPD_SPLIT_BAR) != 0) ntb->features |= NTB_SPLIT_BAR; + if (HAS_FEATURE(ntb, NTB_SB01BASE_LOCKUP) && + !HAS_FEATURE(ntb, NTB_SPLIT_BAR)) { + device_printf(ntb->device, + "Can not apply SB01BASE_LOCKUP workaround " + "with split BARs disabled!\n"); + device_printf(ntb->device, + "Expect system hangs under heavy NTB traffic!\n"); + ntb->features &= ~NTB_SB01BASE_LOCKUP; + } + /* * SDOORBELL errata workaround gets in the way of SB01BASE_LOCKUP * errata workaround; only do one at a time.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201607092322.u69NMiu3054408>