linux-kernel - Re: [PATCH] scsi: pm8001: Fix phys_to_virt() usage on dma_addr

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Date:   Thu, 9 Dec 2021 12:19:40 +0000
From:   John Garry <john.garry@...wei.com>
To:     <Ajish.Koshy@...rochip.com>
CC:     <jinpu.wang@...ud.ionos.com>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <Viswas.G@...rochip.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <damien.lemoal@...nsource.wdc.com>, <Niklas.Cassel@....com>,
        <Vasanthalakshmi.Tharmarajan@...rochip.com>
Subject: Re: [PATCH] scsi: pm8001: Fix phys_to_virt() usage on dma_addr_t

On 09/12/2021 12:04, Ajish.Koshy@...rochip.com wrote:
> Was testing the patch on arm server. Didn't see crash there but observing timeouts and error
> handling getting triggered for drives. But the same code works fine on x86.
> 
> At your end do you still face similar situation on arm server ?

Yeah, I see that as well even without enabling the IOMMU.

root@(none)$ [  163.974907] sas: Enter sas_scsi_recover_host busy: 222 
failed: 222
[  163.981108] sas: sas_scsi_find_task: aborting task 0x000000005c703676
root@(none)$
root@(none)$ [  185.963714] pm80xx0:: pm8001_exec_internal_tmf_task 
757:TMF task[1]timeout.

I figured that it was a card FW issue as I have been using what I got 
out the box, and I have no tool to update the firmware on an arm host.

It seems that SSP and STP commands are not completing for some reason, 
from the "busy: 222" line.