Date: Wed, 2 Nov 2016 23:18:16 +0000 (UTC) From: "Conrad E. Meyer" <cem@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r308230 - head/sys/dev/ioat Message-ID: <201611022318.uA2NIGla049356@repo.freebsd.org>
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Author: cem Date: Wed Nov 2 23:18:16 2016 New Revision: 308230 URL: https://svnweb.freebsd.org/changeset/base/308230 Log: ioat(4): Read CHANSTS register for suspended/halted checks The device doesn't accurately update the CHANCMP address with the device state when the device is suspended or halted. So, read the CHANSTS register to check for those states. We still need to read the CHANCMP address for the last completed descriptor. Sponsored by: Dell EMC Isilon Modified: head/sys/dev/ioat/ioat.c Modified: head/sys/dev/ioat/ioat.c ============================================================================== --- head/sys/dev/ioat/ioat.c Wed Nov 2 22:33:37 2016 (r308229) +++ head/sys/dev/ioat/ioat.c Wed Nov 2 23:18:16 2016 (r308230) @@ -747,6 +747,12 @@ out: wakeup(&ioat->tail); } + /* + * The device doesn't seem to reliably push suspend/halt statuses to + * the channel completion memory address, so poll the device register + * here. + */ + comp_update = ioat_get_chansts(ioat) & IOAT_CHANSTS_STATUS; if (!is_ioat_halted(comp_update) && !is_ioat_suspended(comp_update)) return;
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