linux-kernel - RE: NVMe Poll CQ on timeout

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

Message-ID: <BLUPR0201MB1505FC0425F87A1A8E6E50DAA59B0@BLUPR0201MB1505.namprd02.prod.outlook.com>
Date:   Mon, 7 May 2018 06:57:54 +0000
From:   Bharat Kumar Gogada <bharatku@...inx.com>
To:     "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "keith.busch@...el.com" <keith.busch@...el.com>,
        "hch@....de" <hch@....de>, "axboe@...com" <axboe@...com>
Subject: RE: NVMe Poll CQ on timeout

Hi,

Does anyone have any inputs ?

Regards,
Bharat

> Hi,
> 
> We are testing NVMe cards on ARM64 platform, the card uses legacy
> interrupts.
> Intermittently we are hitting following case in drivers/nvme/host/pci.c
>        /*
>          * Did we miss an interrupt?
>          */
>         if (__nvme_poll(nvmeq, req->tag)) {
>                 dev_warn(dev->ctrl.device,
>                          "I/O %d QID %d timeout, completion polled\n",
>                          req->tag, nvmeq->qid);
>                 return BLK_EH_HANDLED;
>         }
> 
> Can anyone tell when does nvme_timeout gets invoked ?
> What does "Did we miss an interrupt mean" ? Does it mean host missing to
> service a interrupt raised by EP card ?
> 
> Regards,
> Bharat
>