linux-kernel - Re: Report in downstream Debian: mpt3sas broken with xen dom0 with update to 5.10.149 in 5.10.y.

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Date:   Tue, 25 Oct 2022 06:32:11 +0200
From:   Juergen Gross <jgross@...e.com>
To:     jejb@...ux.ibm.com, Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Bart Van Assche <bvanassche@....org>
Cc:     Salvatore Bonaccorso <carnil@...ian.org>,
        sathya.prakash@...adcom.com, suganath-prabu.subramani@...adcom.com,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        adi@...egisch.at
Subject: Re: Report in downstream Debian: mpt3sas broken with xen dom0 with
 update to 5.10.149 in 5.10.y.

On 24.10.22 20:50, James Bottomley wrote:
> On Mon, 2022-10-24 at 14:55 +0200, Juergen Gross wrote:
> [...]
>> Please recheck the backported patch in 5.10.y. It is _wrong_. The
>> backport
>> has:
>>
>> --- a/drivers/scsi/mpt3sas/mpt3sas_base.c
>> +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
>> @@ -2993,7 +2993,7 @@ _base_config_dma_addressing(struct
>> MPT3SAS_ADAPTER *ioc,
>> struct pci_dev *pdev)
>>
>>           if (ioc->is_mcpu_endpoint ||
>>               sizeof(dma_addr_t) == 4 || ioc->use_32bit_dma ||
>> -           dma_get_required_mask(&pdev->dev) <= 32)
>> +           dma_get_required_mask(&pdev->dev) <= DMA_BIT_MASK(32))
>>                   ioc->dma_mask = 32;
>>           /* Set 63 bit DMA mask for all SAS3 and SAS35 controllers */
>>           else if (ioc->hba_mpi_version_belonged > MPI2_VERSION)
>>
>> While the upstream patch has:
>>
>> +       if (ioc->is_mcpu_endpoint || sizeof(dma_addr_t) == 4 ||
>> +           dma_get_required_mask(&pdev->dev) <= 32) {
>>                   ioc->dma_mask = 32;
>> +               coherent_dma_mask = dma_mask = DMA_BIT_MASK(32);
>>
> 
> That's not the upstream commit.  The quoted upstream patch in the
> stable commit is:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e0e0747de0ea3dd87cdbb0393311e17471a9baf1
> 
> Which has the same diff as you quoted for the stable tree.

Hmm, something is fishy here.

Looking at the source in current HEAD of Linus' tree shows me:

static int
_base_config_dma_addressing(struct MPT3SAS_ADAPTER *ioc, struct pci_dev *pdev)
{
         struct sysinfo s;
         u64 coherent_dma_mask, dma_mask;

         if (ioc->is_mcpu_endpoint || sizeof(dma_addr_t) == 4 ||
             dma_get_required_mask(&pdev->dev) <= 32) {
                 ioc->dma_mask = 32;
                 coherent_dma_mask = dma_mask = DMA_BIT_MASK(32);
         /* Set 63 bit DMA mask for all SAS3 and SAS35 controllers */

This doesn't look like commit e0e0747de0ea3dd has been applied.

git log drivers/scsi/mpt3sas/mpt3sas_base.c doesn't show it either.

git name-rev e0e0747de0ea3dd tells me it should be in v6.0-rc7.


Juergen

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