linux-kernel - Re: [RFC PATCH 1/2] x86: PCI bus specific MSI operations

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 for Android: free password hash cracker in your pocket

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

Message-ID: <55E10ED8.1010809@linux.intel.com>
Date:	Sat, 29 Aug 2015 09:46:00 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Keith Busch <keith.busch@...el.com>
Cc:	x86@...nel.org, LKML <linux-kernel@...r.kernel.org>,
	Bryan Veal <bryan.e.veal@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-pci@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] x86: PCI bus specific MSI operations

On 2015/8/29 0:54, Thomas Gleixner wrote:
> On Thu, 27 Aug 2015, Keith Busch wrote:
> 
>> This patch adds struct x86_msi_ops to x86's PCI sysdata. This gives a
>> host bridge driver the option to provide alternate MSI Data Register
>> and MSI-X Table Entry programming for devices in PCI domains that do
>> not subscribe to usual "IOAPIC" format.
> 
> I'm not too fond about more ad hoc indirection and special casing. We
> should be able to handle this with hierarchical irq domains. Jiang
> might have an idea how to do that for your case.
Hi Thomas and Keith,
	I have noticed this patch set yesterday, but still investigating the
better way to handle this. Basically I think
we should build per-domain/per-bus/per-device PCI MSI irqdomain,
just like what ARM have done. That will give us a clear picture.
But I need more information about the hardware topology
to correctly build up the hierarchical irqdomain, especially the
relationship between the embedded host bridge and IOMMU units.
	Keith, could you please help to provide some doc with
hardware details?
Thanks!
Gerry
--
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/