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From:   Gavin Guo <gavin.guo@canonical.com>
Date:   Fri, 6 Oct 2017 09:08:05 +0800
Message-ID: <CA+eFSM24pwY0ViCiUqvzNDJa-Q0h0+XnEFF-gesKfBcEVKyLgQ@mail.gmail.com>
Subject: Re: mptsas driver cannot detect hotplugging disk with the LSI SCSI
 SAS1068 controller in Ubuntu guest on VMware
To:     Hannes Reinecke <hare@suse.de>
Cc:     linux-scsi@vger.kernel.org,
        linux-kernel <linux-kernel@vger.kernel.org>
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On Mon, Oct 2, 2017 at 10:32 PM, Hannes Reinecke <hare@suse.de> wrote:
> On 09/27/2017 09:33 AM, Gavin Guo wrote:
>> There is a problem in the latest upstream kernel with the device:
>>
>> $ grep -i lsi lspci
>> 03:00.0 Serial Attached SCSI controller [0107]: LSI Logic / Symbios
>> Logic SAS1068 PCI-X Fusion-MPT SAS [1000:0054] (rev 01)
>>
>> The device is simulated by the VMware ESXi 5.5
>>
>> When hotplugging a new disk to the Guest Ubuntu OS, the latest kernel
>> cannot automatically probe the disk. However, on the v3.19.0-80.88
>> kernel, the disk can be dynamically probed and show the following
>> info message:
>>
>> mptsas: ioc0: attaching ssp device: fw_channel 0, fw_id 1, phy 1,
>> sas_addr 0x5000c29a6bdae0f5
>> scsi 2:0:1:0: Direct-Access     VMware   Virtual disk     1.0  PQ: 0
>> ANSI: 2
>> sd 2:0:1:0: Attached scsi generic sg2 type 0
>> sd 2:0:1:0: [sdb] 2097152 512-byte logical blocks: (1.07 GB/1.00 GiB)
>> sd 2:0:1:0: [sdb] Write Protect is off
>> sd 2:0:1:0: [sdb] Mode Sense: 61 00 00 00
>> sd 2:0:1:0: [sdb] Cache data unavailable
>> sd 2:0:1:0: [sdb] Assuming drive cache: write through
>>  sdb: unknown partition table
>> sd 2:0:1:0: [sdb] Attached SCSI disk
>>
>> After looking up the message:
>> mptsas: ioc0: attaching ssp device: fw_channel 0, fw_id 1, phy 1,
>> sas_addr 0x5000c29a6bdae0f5
>>
>> I found it comes from the path:
>> mptsas_firmware_event_work -> mptsas_send_sas_event ->
>> mptsas_hotplug_work -> mptsas_add_end_device
>>
>> I'll appreciate if anyone can give the idea: If it's possible that the
>> irq from the simulated LSI SAS controller didn't come in to trigger
>> the event? However, it can work on the v3.19 kernel so if there is
>> any driver implementation issue in the latest kernel.
>>
> This is an issue with the mptsas driver, who originally assumed that no
> system will have direct-attached SAS devices.
> VMWare chose to implement exactly that, so the hotplug detection logic
> is flawed here.
> I'll be sending a patch.
>
> Cheers,
>
> Hannes
> --
> Dr. Hannes Reinecke                Teamlead Storage & Networking
> hare@suse.de                                   +49 911 74053 688
> SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
> GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
> HRB 21284 (AG Nürnberg)

Thank you in advance. Please add me to the CC list when you send out
the patch and I can help to verify that.

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