Date: Sun, 13 Dec 2009 02:20:47 +0200 From: Alexander Motin <mav@FreeBSD.org> To: Juergen Lock <nox@jelal.kn-bremen.de> Cc: Alexander Best <alexbestms@wwu.de>, freebsd-current@FreeBSD.org, Andriy Gapon <avg@icyb.net.ua> Subject: Re: Testing CAM wrapper for ata(4) controller drivers Message-ID: <4B24335F.7060405@FreeBSD.org> In-Reply-To: <200912130011.nBD0BNSl033498@triton8.kn-bremen.de> References: <alpine.BSF.2.00.0912081753490.62215@ibyngvyr.purzvxnyf.bet> <permail-20091209230748f7e55a9d00005dca-a_best01@message-id.uni-muenster.de> <4B20EA1F.5080107@icyb.net.ua> <200912130011.nBD0BNSl033498@triton8.kn-bremen.de>
next in thread | previous in thread | raw e-mail | index | archive | help
Juergen Lock wrote: > In article <4B20EDD2.5000102@FreeBSD.org> you write: >> Andriy Gapon wrote: >>> on 10/12/2009 01:07 Alexander Best said the following: >>>> ah. i see. thanks for the hint. sorry mav for blaming ATA_CAM. ;) would be >>>> nice if this would be fixed at some point. i believe the problem also applies >>>> to tape drives, usb memory card readers, etc.? so generally speaking: any >>>> devices which allow new media insertion, but don't disconnect/re-attach >>>> from/to CAM. >>> Yes, we need to get some notification that media is changed and then trigger geom >>> action. Right now there is no notification from hardware in most cases and there >>> is no support for handling that in drivers, AFAIK. Maybe ahci driver starts to >>> add support for that. So either something needs to poll media for changes or a >>> user has to trigger some action explicitly. No magic. >> Both ahci and siis drivers already have SATA Asynchronous Notifications >> support, that was especially made to do that. Now AN used to receive >> messages from PMP about fan-out ports physical events and working fine. >> >> What is needed: SATA ATAPI device with AN support (haven't checked if >> there are ones on the market), enable these messages, improve cd driver >> to make some useful activity (have no idea how) on such events. > > Doesn't scsi have `unit attention' to notify media changes? Or does > that not work as expected with atapi? Haven't checked. Will try it tomorrow. But any way it require device polling. SATA AN same time is device-initiated real-time event. -- Alexander Motin
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4B24335F.7060405>