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Date: Tue, 26 May 2020 23:07:48 +0000 From: Luis Chamberlain <mcgrof@...nel.org> To: Jakub Kicinski <kuba@...nel.org> Cc: jeyu@...nel.org, davem@...emloft.net, michael.chan@...adcom.com, dchickles@...vell.com, sburla@...vell.com, fmanlunas@...vell.com, aelior@...vell.com, GR-everest-linux-l2@...vell.com, kvalo@...eaurora.org, johannes@...solutions.net, akpm@...ux-foundation.org, arnd@...db.de, rostedt@...dmis.org, mingo@...hat.com, aquini@...hat.com, cai@....pw, dyoung@...hat.com, bhe@...hat.com, peterz@...radead.org, tglx@...utronix.de, gpiccoli@...onical.com, pmladek@...e.com, tiwai@...e.de, schlad@...e.de, andriy.shevchenko@...ux.intel.com, derosier@...il.com, keescook@...omium.org, daniel.vetter@...ll.ch, will@...nel.org, mchehab+samsung@...nel.org, vkoul@...nel.org, mchehab+huawei@...nel.org, robh@...nel.org, mhiramat@...nel.org, sfr@...b.auug.org.au, linux@...inikbrodowski.net, glider@...gle.com, paulmck@...nel.org, elver@...gle.com, bauerman@...ux.ibm.com, yamada.masahiro@...ionext.com, samitolvanen@...gle.com, yzaikin@...gle.com, dvyukov@...gle.com, rdunlap@...radead.org, corbet@....net, dianders@...omium.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org Subject: Re: [PATCH v3 0/8] kernel: taint when the driver firmware crashes On Tue, May 26, 2020 at 03:46:06PM -0700, Jakub Kicinski wrote: > On Tue, 26 May 2020 14:58:07 +0000 Luis Chamberlain wrote: > > To those new on CC -- this is intended to be a simple generic interface > > to the kernel to annotate when the firwmare has crashed leaving the > > driver or system in a questionable state, in the worst case requiring > > full system reboot. This series is first addressing only a few > > networking patches, however, I already have an idea of where such > > firmware crashes happen across the tree. The goal with this series then > > is to first introduce the simple framework, and only if that moves > > forward will I continue to chug on with the rest of the drivers / > > subsystems. > > > > This is *not* a networking specific problem only. > > > > This v3 augments the last series by introducing the uevent for panic > > events, one of them is during tainting. The uvent mechanism is > > independent from any of this firmware taint mechanism. I've also > > addressed Jessica Yu's feedback. Given I've extended the patches a bit > > with other minor cleanup which checkpatch.pl complains over, and since > > this infrastructure is still being discussed, I've trimmed the patch > > series size to only cover drivers for which I've received an Acked-by > > from the respective driver maintainer, or where we have bug reports to > > support such dire situations on the driver such as ath10k. > > > > During the last v2 it was discussed that we should instead use devlink > > for this work, however the initial RFC patches produced by Jakub > > Kicinski [0] shows how devlink is networking specific, and the intent > > behind this series is to produce simple helpers which can be used by *any* > > device driver, for any subsystem, not just networking. Subsystem > > specific infrastructure to help address firwmare crashes may still make > > sense, however that does not mean we *don't* need something even more > > generic regardless of the subsystem the issue happens on. Since uevents > > for taints are exposed, we now expose these through uapi as well, and > > that was something which eventually had to happen given that the current > > scheme of relying on sensible character representations for each taint > > will not scale beyond the alphabet. > > Nacked-by: Jakub Kicinski <kuba@...nel.org> Care to elaborate? Luis
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