From: sagig@dev.mellanox.co.il (Sagi Grimberg)
Subject: [PATCH] NVMe: do not touch sq door bell if nvmeq has been suspended
Date: Tue, 2 Feb 2016 16:33:10 +0200 [thread overview]
Message-ID: <56B0BE26.6070208@dev.mellanox.co.il> (raw)
In-Reply-To: <20160202142756.GA10690@localhost.localdomain>
Hey Keith,
>> First of all, I think we need to cancel all
>> inflight requests before nvme_dev_unmap.
>
> IO cancelling is where it is because it protects against host memory
> corruption. If you're going to mess with the ordering, just make sure
> the PCI device is disabled from bus mastering first.
Little help? :)
What corruption is the ordering protecting against?
WARNING: multiple messages have this Message-ID (diff)
From: Sagi Grimberg <sagig@dev.mellanox.co.il>
To: Keith Busch <keith.busch@intel.com>
Cc: Wenbo Wang <wenbo.wang@memblaze.com>, Jens Axboe <axboe@fb.com>,
Wenbo Wang <mail_weber_wang@163.com>,
"Wenwei.Tao" <wenwei.tao@memblaze.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>
Subject: Re: [PATCH] NVMe: do not touch sq door bell if nvmeq has been suspended
Date: Tue, 2 Feb 2016 16:33:10 +0200 [thread overview]
Message-ID: <56B0BE26.6070208@dev.mellanox.co.il> (raw)
In-Reply-To: <20160202142756.GA10690@localhost.localdomain>
Hey Keith,
>> First of all, I think we need to cancel all
>> inflight requests before nvme_dev_unmap.
>
> IO cancelling is where it is because it protects against host memory
> corruption. If you're going to mess with the ordering, just make sure
> the PCI device is disabled from bus mastering first.
Little help? :)
What corruption is the ordering protecting against?
next prev parent reply other threads:[~2016-02-02 14:33 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-01 15:42 [PATCH] NVMe: do not touch sq door bell if nvmeq has been suspended Wenbo Wang
2016-02-01 15:42 ` Wenbo Wang
2016-02-01 15:59 ` Busch, Keith
2016-02-01 15:59 ` Busch, Keith
2016-02-01 16:17 ` Wenbo Wang
2016-02-01 16:17 ` Wenbo Wang
2016-02-01 16:54 ` Jens Axboe
2016-02-01 16:54 ` Jens Axboe
2016-02-02 7:15 ` Wenbo Wang
2016-02-02 12:41 ` Sagi Grimberg
2016-02-02 12:41 ` Sagi Grimberg
2016-02-02 14:27 ` Keith Busch
2016-02-02 14:27 ` Keith Busch
2016-02-02 14:33 ` Sagi Grimberg [this message]
2016-02-02 14:33 ` Sagi Grimberg
2016-02-02 14:46 ` Keith Busch
2016-02-02 14:46 ` Keith Busch
2016-02-02 17:20 ` Sagi Grimberg
2016-02-02 17:20 ` Sagi Grimberg
2016-02-03 0:49 ` Wenbo Wang
2016-02-02 17:25 ` Keith Busch
2016-02-02 17:25 ` Keith Busch
2016-02-03 0:19 ` Wenbo Wang
2016-02-03 14:41 ` Keith Busch
2016-02-03 14:41 ` Keith Busch
2016-02-03 16:35 ` Wenbo Wang
2016-02-03 16:38 ` Keith Busch
2016-02-03 16:38 ` Keith Busch
2016-02-06 14:32 ` Wenbo Wang
2016-02-07 13:41 ` Sagi Grimberg
2016-02-07 13:41 ` Sagi Grimberg
2016-02-08 15:01 ` Keith Busch
2016-02-08 15:01 ` Keith Busch
2016-02-09 11:22 ` Wenbo Wang
2016-02-09 22:55 ` Keith Busch
2016-02-09 22:55 ` Keith Busch
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