Messages in this thread | | | From | Lu Baolu <> | Subject | [PATCH v3 0/8] iommu/vt-d: Delegate DMA domain to generic iommu | Date | Mon, 29 Apr 2019 10:09:17 +0800 |
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Hi,
This patchset delegates the iommu DMA domain management to the generic iommu layer. It avoids the use of find_or_alloc_domain whose domain assignment is inconsistent with the iommu grouping as determined by pci_device_group.
The major change is to permit domains of type IOMMU_DOMAIN_DMA and IOMMU_DOMAIN_IDENTITY to be allocated via the iommu_ops api. This allows the default_domain of an iommu group to be set in iommu.c. This domain will be attached to every device that is brought up with an iommu group, and the devices reserved regions will be mapped using regions returned by get_resv_regions.
The default domain implementation defines a default domain type and a domain of the default domain type will be allocated and attached to devices which belong to a same group. Unfortunately, this doesn't work for some quirky devices which is known to only work with a specific domain type. PATCH 1/8 adds an iommu ops which allows the IOMMU driver to return whether a device requires a specific domain type, otherwise the staic defined type will be applied.
Other changes are limited within the Intel IOMMU driver. They mainly allow the driver to adapt to allocating domains, attaching domains, applying and direct mapping reserved memory regions, deferred domain attachment, and so on, via the iommu_ops api's.
This patchset was initiated by James Sewart. The v1 and v2 were posted here [1] [2] for discussion. Lu Baolu took over the work for testing and bug fixing with permission from James Sewart.
Reference: [1] https://lkml.org/lkml/2019/3/4/644 [2] https://lkml.org/lkml/2019/3/14/299
Best regards, Lu Baolu
Change log: v2->v3: - Add supported default domain type callback. - Make the iommu map() callback work even the domain is not attached. - Add domain deferred attach when iommu is pre-enabled in kdump kernel.
v1->v2: - https://lkml.org/lkml/2019/3/14/299 - Refactored ISA direct mappings to be returned by iommu_get_resv_regions. - Integrated patch by Lu to defer turning on DMAR until iommu.c has mapped reserved regions. - Integrated patches by Lu to remove more unused code in cleanup.
v1: -Original post https://lkml.org/lkml/2019/3/4/644
James Sewart (4): iommu/vt-d: Implement apply_resv_region iommu ops entry iommu/vt-d: Expose ISA direct mapping region via iommu_get_resv_regions iommu/vt-d: Allow DMA domains to be allocated by iommu ops iommu/vt-d: Remove lazy allocation of domains
Lu Baolu (4): iommu: Add ops entry for supported default domain type iommu/vt-d: Enable DMA remapping after rmrr mapped iommu/vt-d: Implement def_domain_type iommu ops entry iommu/vt-d: Implement is_attach_deferred iommu ops entry
drivers/iommu/intel-iommu.c | 630 +++++++++++------------------------- drivers/iommu/iommu.c | 13 +- include/linux/iommu.h | 11 + 3 files changed, 210 insertions(+), 444 deletions(-)
-- 2.17.1
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