linux-kernel - "iommu/vt-d: Delegate DMA domain to generic iommu" series breaks megaraid

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Date:   Fri, 07 Jun 2019 17:08:37 -0400
From:   Qian Cai <cai@....pw>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     James Sewart <jamessewart@...sta.com>,
        Joerg Roedel <jroedel@...e.de>,
        iommu@...ts.linux-foundation.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kashyap Desai <kashyap.desai@...adcom.com>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Shivasharan S <shivasharan.srikanteshwara@...adcom.com>
Subject: "iommu/vt-d: Delegate DMA domain to generic iommu" series breaks
 megaraid_sas

The linux-next series "iommu/vt-d: Delegate DMA domain to generic iommu" [1]
causes a system with the rootfs on megaraid_sas card unable to boot.

Reverted the whole series on the top of linux-next (next-20190607) fixed the
issue.

The information regards this storage card is,

[  116.466810][  T324] megaraid_sas 0000:06:00.0: FW provided supportMaxExtLDs:
0	max_lds: 32
[  116.476052][  T324] megaraid_sas 0000:06:00.0: controller type	:
iMR(0MB)
[  116.483646][  T324] megaraid_sas 0000:06:00.0: Online Controller Reset(OCR)	
: Enabled
[  116.492403][  T324] megaraid_sas 0000:06:00.0: Secure JBOD support	:
Yes
[  116.499887][  T324] megaraid_sas 0000:06:00.0: NVMe passthru support	:
No
[  116.507480][  T324] megaraid_sas 0000:06:00.0: FW provided
[  116.612523][  T324] megaraid_sas 0000:06:00.0: NVME page size	: (0)
[  116.629991][  T324] megaraid_sas 0000:06:00.0: INIT adapter done
[  116.714789][  T324] megaraid_sas 0000:06:00.0: pci id		:
(0x1000)/(0x0017)/(0x1d49)/(0x0500)
[  116.724228][  T324] megaraid_sas 0000:06:00.0: unevenspan support	: no
[  116.731518][  T324] megaraid_sas 0000:06:00.0: firmware crash dump	:
no
[  116.738981][  T324] megaraid_sas 0000:06:00.0: jbod sync map		:
yes
[  116.787433][  T324] scsi host0: Avago SAS based MegaRAID driver
[  117.081088][  T324] scsi 0:0:0:0: Direct-
Access     LENOVO   ST900MM0168      L587 PQ: 0 ANSI: 6

[1] https://lore.kernel.org/patchwork/cover/1078960/