Date: Sat, 06 Jul 2019 17:20:29 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 211713] NVME controller failure: resetting (Samsung SM961 SSD Drives) Message-ID: <bug-211713-227-8GNSvLolZ0@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-211713-227@https.bugs.freebsd.org/bugzilla/> References: <bug-211713-227@https.bugs.freebsd.org/bugzilla/>
next in thread | previous in thread | raw e-mail | index | archive | help
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211713 --- Comment #78 from Ka Ho Ng <khng300@gmail.com> --- (In reply to Warner Losh from comment #77) The commit message of the patch is actually inside this commit: https://github.com/khng300/freebsd/commit/c75f08495fde5dee08e4b24f399f2d70a= 77254a6 To put simply, some controllers give zeroes for MMIO read on certain region= s, and subsequently leading to MSI-X not being enabled at all (the interrupts = will first be masked and it will be in effect, however the subsequent unmask will not work at all). As a result the corresponding bit in PBA will be set by t= he controller since the interrupt is actually not enabled after being masked (recall that the read of vector control word will always give zero). Such modification is actually made by taking a reference at the interrupt unmask implementation of Illumos kernel, by not considering the existing content of vector control bit but simply overwriting the word. --=20 You are receiving this mail because: You are the assignee for the bug.=
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-211713-227-8GNSvLolZ0>