Tags: patch Dear maintainers,
after the discussion about the root cause of this issue on the linux-scsi mailing list[1] there was one simple patch submitted to this list[2] that just changes the logic of the selection of the dma mask: in case of a 64bit host operating system, the driver chooses a 63/64bit mask. We backported and tested this patch on our systems and everything works just fine. Find our backported patch for 5.10 kernels attached. We tested that patch with 5.10.149-2/5.10.0-19 and 5.10.158-2/5.10.0-20. Note, however, this patch has not yet been merged upstream and thus there is no backport of this to the lts kernels. I am pretty unsure about how to proceed: currently we're using dkms to build binary module packages with the attached patch (dkms mkbmdeb) and do deploy these to our servers but we'd really love to see this patch upstream and downstream! :) all the best, Adi [1] https://lore.kernel.org/linux-scsi/y1jkuktjvyrow...@eldamar.lan/T/ [2] https://lore.kernel.org/linux-scsi/20221028091655.17741-2-sreekanth.re...@broadcom.com/T/
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c 2022-12-14 18:08:44.136490166 +0100 +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c 2022-12-14 18:15:16.682042992 +0100 @@ -2823,9 +2823,7 @@ { struct sysinfo s; - if (ioc->is_mcpu_endpoint || - sizeof(dma_addr_t) == 4 || ioc->use_32bit_dma || - dma_get_required_mask(&pdev->dev) <= DMA_BIT_MASK(32)) + if (ioc->is_mcpu_endpoint || sizeof(dma_addr_t) == 4) ioc->dma_mask = 32; /* Set 63 bit DMA mask for all SAS3 and SAS35 controllers */ else if (ioc->hba_mpi_version_belonged > MPI2_VERSION)
signature.asc
Description: PGP signature