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@xxxxxxx +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)
