From: Jan Kiszka <jan.kiszka@siemens.com>
To: Philippe Gerum <rpm@xenomai.org>
Cc: "Mauerer, Wolfgang" <wolfgang.mauerer@siemens.com>,
Xenomai <xenomai@xenomai.org>
Subject: Re: [Xenomai] [PATCH] Revert "ipipe: ipipe_request_irq(), ipipe_free_irq() are root-only services"
Date: Thu, 20 Sep 2012 12:57:11 +0200 [thread overview]
Message-ID: <505AF687.9010002@siemens.com> (raw)
In-Reply-To: <505AF641.6030604@siemens.com>
On 2012-09-20 12:56, Jan Kiszka wrote:
> On 2012-09-20 12:49, Philippe Gerum wrote:
>> On 09/20/2012 12:37 PM, Jan Kiszka wrote:
>>> This reverts commit 073ff1e8045d0311b8cf390687c0ba3619681672.
>>>
>>> Both service are NOT just root-only services. E.g., rtdm_irq_request
>>> requires by specification support also over non-Linux contexts.
>>
>> Nack. We can't run the enable code for MSIs over non-root, and
>> that code typically follows the irq request. Besides, we want to mask
>> the source upon irq free to handle the SMP case properly, which we could
>> not do from non-root with MSIs.
>>
>> So either we have both request+enable and free usable over non-root, or
>> there is no point.
>
> OK, I get the point with legacy MSI. Then we have two other bugs to solve:
> - in I-pipe as it holds a hardened spin lock across enable/disable (of
> MSIs)
> - in Xenomai 2.6 (at least, didn't check forge) as it calls with a
> hardened spin lock held into ipipe_virtualize_irq
Sorry, three bugs:
- in the RTDM spec as it always allowed rtdm_irq_request over RT task
contexts
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
Corporate Competence Center Embedded Linux
next prev parent reply other threads:[~2012-09-20 10:57 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-20 10:37 [Xenomai] [PATCH] Revert "ipipe: ipipe_request_irq(), ipipe_free_irq() are root-only services" Jan Kiszka
2012-09-20 10:49 ` Philippe Gerum
2012-09-20 10:56 ` Jan Kiszka
2012-09-20 10:57 ` Jan Kiszka [this message]
2012-09-20 11:06 ` Philippe Gerum
2012-09-20 11:15 ` Jan Kiszka
2012-09-20 11:27 ` Jan Kiszka
2012-09-20 13:01 ` Gilles Chanteperdrix
2012-09-20 13:15 ` Jan Kiszka
2012-09-20 14:12 ` Gilles Chanteperdrix
2012-09-20 15:00 ` Jan Kiszka
2012-09-20 15:13 ` Gilles Chanteperdrix
2012-09-20 13:10 ` Philippe Gerum
2012-09-20 13:54 ` Jan Kiszka
2012-09-20 14:05 ` Philippe Gerum
2012-09-20 15:07 ` Jan Kiszka
2012-09-20 15:16 ` Philippe Gerum
2012-09-20 15:45 ` Jan Kiszka
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