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From: Lu Baolu <baolu.lu@linux.intel.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: baolu.lu@linux.intel.com, kevin.tian@intel.com,
	ashok.raj@intel.com, dima@arista.com, tmurphy@arista.com,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	jacob.jun.pan@intel.com, David Woodhouse <dwmw2@infradead.org>,
	Joerg Roedel <jroedel@suse.de>
Subject: Re: [PATCH v4 12/15] iommu/vt-d: Cleanup get_valid_domain_for_dev()
Date: Tue, 6 Aug 2019 08:06:49 +0800	[thread overview]
Message-ID: <605e3cdb-35bd-45c6-73be-d3263c11def8@linux.intel.com> (raw)
In-Reply-To: <20190802105406.53cd9977@x1.home>

Hi Alex,

On 8/3/19 12:54 AM, Alex Williamson wrote:
> On Fri, 2 Aug 2019 15:17:45 +0800
> Lu Baolu <baolu.lu@linux.intel.com> wrote:
> 
>> Hi Alex,
>>
>> Thanks for reporting this. I will try to find a machine with a
>> pcie-to-pci bridge and get this issue fixed. I will update you
>> later.
> 
> Further debug below...
> 
>> On 8/2/19 9:30 AM, Alex Williamson wrote:
>>> DMAR: No ATSR found
>>> DMAR: dmar0: Using Queued invalidation
>>> DMAR: dmar1: Using Queued invalidation
>>> pci 0000:00:00.0: DMAR: Software identity mapping
>>> pci 0000:00:01.0: DMAR: Software identity mapping
>>> pci 0000:00:02.0: DMAR: Software identity mapping
>>> pci 0000:00:16.0: DMAR: Software identity mapping
>>> pci 0000:00:1a.0: DMAR: Software identity mapping
>>> pci 0000:00:1b.0: DMAR: Software identity mapping
>>> pci 0000:00:1c.0: DMAR: Software identity mapping
>>> pci 0000:00:1c.5: DMAR: Software identity mapping
>>> pci 0000:00:1c.6: DMAR: Software identity mapping
>>> pci 0000:00:1c.7: DMAR: Software identity mapping
>>> pci 0000:00:1d.0: DMAR: Software identity mapping
>>> pci 0000:00:1f.0: DMAR: Software identity mapping
>>> pci 0000:00:1f.2: DMAR: Software identity mapping
>>> pci 0000:00:1f.3: DMAR: Software identity mapping
>>> pci 0000:01:00.0: DMAR: Software identity mapping
>>> pci 0000:01:00.1: DMAR: Software identity mapping
>>> pci 0000:03:00.0: DMAR: Software identity mapping
>>> pci 0000:04:00.0: DMAR: Software identity mapping
>>> DMAR: Setting RMRR:
>>> pci 0000:00:02.0: DMAR: Setting identity map [0xbf800000 - 0xcf9fffff]
>>> pci 0000:00:1a.0: DMAR: Setting identity map [0xbe8d1000 - 0xbe8dffff]
>>> pci 0000:00:1d.0: DMAR: Setting identity map [0xbe8d1000 - 0xbe8dffff]
>>> DMAR: Prepare 0-16MiB unity mapping for LPC
>>> pci 0000:00:1f.0: DMAR: Setting identity map [0x0 - 0xffffff]
>>> pci 0000:00:00.0: Adding to iommu group 0
>>> pci 0000:00:00.0: Using iommu direct mapping
>>> pci 0000:00:01.0: Adding to iommu group 1
>>> pci 0000:00:01.0: Using iommu direct mapping
>>> pci 0000:00:02.0: Adding to iommu group 2
>>> pci 0000:00:02.0: Using iommu direct mapping
>>> pci 0000:00:16.0: Adding to iommu group 3
>>> pci 0000:00:16.0: Using iommu direct mapping
>>> pci 0000:00:1a.0: Adding to iommu group 4
>>> pci 0000:00:1a.0: Using iommu direct mapping
>>> pci 0000:00:1b.0: Adding to iommu group 5
>>> pci 0000:00:1b.0: Using iommu direct mapping
>>> pci 0000:00:1c.0: Adding to iommu group 6
>>> pci 0000:00:1c.0: Using iommu direct mapping
>>> pci 0000:00:1c.5: Adding to iommu group 7
>>> pci 0000:00:1c.5: Using iommu direct mapping
>>> pci 0000:00:1c.6: Adding to iommu group 8
>>> pci 0000:00:1c.6: Using iommu direct mapping
>>> pci 0000:00:1c.7: Adding to iommu group 9
> 
> Note that group 9 contains device 00:1c.7
> 
>>> pci 0000:00:1c.7: Using iommu direct mapping
> 
> I'm booted with iommu=pt, so the domain type is IOMMU_DOMAIN_PT
> 
>>> pci 0000:00:1d.0: Adding to iommu group 10
>>> pci 0000:00:1d.0: Using iommu direct mapping
>>> pci 0000:00:1f.0: Adding to iommu group 11
>>> pci 0000:00:1f.0: Using iommu direct mapping
>>> pci 0000:00:1f.2: Adding to iommu group 11
>>> pci 0000:00:1f.3: Adding to iommu group 11
>>> pci 0000:01:00.0: Adding to iommu group 1
>>> pci 0000:01:00.1: Adding to iommu group 1
>>> pci 0000:03:00.0: Adding to iommu group 12
>>> pci 0000:03:00.0: Using iommu direct mapping
>>> pci 0000:04:00.0: Adding to iommu group 13
>>> pci 0000:04:00.0: Using iommu direct mapping
>>> pci 0000:05:00.0: Adding to iommu group 9
> 
> 05:00.0 is downstream of 00:1c.7 and in the same group.  As above, the
> domain is type IOMMU_DOMAIN_IDENTITY, so we take the following branch:
> 
>          } else {
>                  if (device_def_domain_type(dev) == IOMMU_DOMAIN_DMA) {
> 
> Default domain type is IOMMU_DOMAIN_DMA because of the code block in
> device_def_domain_type() handling bridges to conventional PCI and
> conventional PCI endpoints.
> 
>                          ret = iommu_request_dma_domain_for_dev(dev);
> 
> This fails in request_default_domain_for_dev() because there's more
> than one device in the group.
> 
>                          if (ret) {
>                                  dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
>                                  if (!get_private_domain_for_dev(dev)) {
> 
> With this commit, this now returns NULL because find_domain() does find
> a domain, the same one we found before this code block.
> 
>                                          dev_warn(dev,
>                                                   "Failed to get a private domain.\n");
>                                          return -ENOMEM;
>                                  }
> 
> So the key factors are that I'm booting with iommu=pt and I have a
> PCIe-to-PCI bridge grouped with its parent root port.  The bridge
> wants an IOMMU_DOMAIN_DMA, but the group domain is already of type
> IOMMU_DOMAIN_IDENTITY.  A temporary workaround is to not use
> passthrough mode, but this is a regression versus previous kernels.
> Thanks,
> 

I can reproduce this issue with a local setup. I will submit the fix and
cc it to you. Please let me know if that fix doesn't solve this problem.

Best regards,
Baolu

  parent reply	other threads:[~2019-08-06  0:07 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-25  5:41 [PATCH v4 00/15] iommu/vt-d: Delegate DMA domain to generic iommu Lu Baolu
2019-05-25  5:41 ` [PATCH v4 01/15] iommu: Add API to request DMA domain for device Lu Baolu
2019-05-25  5:41 ` [PATCH v4 02/15] iommu/vt-d: Implement apply_resv_region iommu ops entry Lu Baolu
2019-05-25  5:41 ` [PATCH v4 03/15] iommu/vt-d: Expose ISA direct mapping region via iommu_get_resv_regions Lu Baolu
2019-05-25  5:41 ` [PATCH v4 04/15] iommu/vt-d: Enable DMA remapping after rmrr mapped Lu Baolu
2019-05-25  5:41 ` [PATCH v4 05/15] iommu/vt-d: Add device_def_domain_type() helper Lu Baolu
2019-05-25  5:41 ` [PATCH v4 06/15] iommu/vt-d: Delegate the identity domain to upper layer Lu Baolu
2019-05-25  5:41 ` [PATCH v4 07/15] iommu/vt-d: Delegate the dma " Lu Baolu
2020-08-21 18:33   ` Chris Wilson
2020-08-24  6:31     ` Lu Baolu
2020-08-24  8:35       ` Chris Wilson
2020-08-25  3:13         ` Lu Baolu
2019-05-25  5:41 ` [PATCH v4 08/15] iommu/vt-d: Identify default domains replaced with private Lu Baolu
2019-05-25  5:41 ` [PATCH v4 09/15] iommu/vt-d: Handle 32bit device with identity default domain Lu Baolu
2019-05-25  5:41 ` [PATCH v4 10/15] iommu/vt-d: Probe DMA-capable ACPI name space devices Lu Baolu
2019-05-29  6:16   ` Christoph Hellwig
2019-06-03  0:35     ` Lu Baolu
2019-05-25  5:41 ` [PATCH v4 11/15] iommu/vt-d: Implement is_attach_deferred iommu ops entry Lu Baolu
2019-05-25  5:41 ` [PATCH v4 12/15] iommu/vt-d: Cleanup get_valid_domain_for_dev() Lu Baolu
2019-07-18  3:12   ` Alex Williamson
2019-07-19  9:04     ` Lu Baolu
2019-07-19 15:23       ` Alex Williamson
2019-08-02  1:30         ` Alex Williamson
2019-08-02  7:17           ` Lu Baolu
2019-08-02 16:54             ` Alex Williamson
2019-08-04  3:16               ` Lu Baolu
2019-08-06  0:06               ` Lu Baolu [this message]
2019-05-25  5:41 ` [PATCH v4 13/15] iommu/vt-d: Remove startup parameter from device_def_domain_type() Lu Baolu
2019-05-25  5:41 ` [PATCH v4 14/15] iommu/vt-d: Remove duplicated code for device hotplug Lu Baolu
2019-05-25  5:41 ` [PATCH v4 15/15] iommu/vt-d: Remove static identity map code Lu Baolu
2019-05-27 15:00 ` [PATCH v4 00/15] iommu/vt-d: Delegate DMA domain to generic iommu Joerg Roedel

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