linux-kernel - Re: [PATCH v3] PCI: portdrv: Report degraded links via link bandwidth notification

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190228063157.rl2lywgian2ij5m4@wunner.de>
Date:   Thu, 28 Feb 2019 07:31:57 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     Alexandru Gagniuc <mr.nuke.me@...il.com>
Cc:     bhelgaas@...gle.com, austin_bolen@...l.com,
        alex_gagniuc@...lteam.com, keith.busch@...el.com,
        Shyam_Iyer@...l.com, okaya@...nel.org,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Oza Pawandeep <poza@...eaurora.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Benjamin Young <youngcdev@...il.com>,
        Frederick Lawler <fred@...dlawl.com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v3] PCI: portdrv: Report degraded links via link
 bandwidth notification

On Wed, Feb 27, 2019 at 02:58:17PM -0600, Alexandru Gagniuc wrote:
> A warning is generated when a PCIe device is probed with a degraded
> link, but there was no similar mechanism to warn when the link becomes
> degraded after probing. The Link Bandwidth Notification provides this
> mechanism.
> 
> Use the link bandwidth notification interrupt to detect bandwidth
> changes, and rescan the bandwidth, looking for the weakest point. This
> is the same logic used in probe().
> 
> Signed-off-by: Alexandru Gagniuc <mr.nuke.me@...il.com>

Reviewed-by: Lukas Wunner <lukas@...ner.de>