linux-kernel - Re: Question on MSI support in PCI and PCI-E devices

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-next>] [day] [month] [year] [list]

Date:	Thu, 12 Feb 2015 06:48:55 -0800
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Andrey Utkin <andrey.krieger.utkin@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kernelnewbies <kernelnewbies@...nelnewbies.org>,
	"kernel-mentors@...enic.com" <kernel-mentors@...enic.com>
Subject: Re: Question on MSI support in PCI and PCI-E devices

On Wed, 11 Feb 2015 18:19:00 +0000
Andrey Utkin <andrey.krieger.utkin@...il.com> wrote:

> Is it true that _every_ PCI or PCI Express device supporting MSI is
> indicated by some mention of MSI in "lspci -v", and if there's no such
> mention, it surely doesn't support MSI?
> 

Look at kernel source (drivers/pci/msi.c) function pci_msi_supported
there are many things which can block MSI.

There can be cases where PCI quirks in kernel block MSI
because for example the device supports MSI, but the motherboard
BIOS is broken. This only happens on really old systems.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/