[PATCH v9 00/11] ACPI/IORT: Support for IORT RMR node

Shameer Kolothum
2022-04-04T12:42:58Z

Hi

v8 --> v9
- Adressed comments from Robin on interfaces as discussed here[0].
- Addressed comments from Lorenzo.

Though functionally there aren't any major changes, the interfaces have
changed from v8 and for that reason not included the T-by tags from
Steve and Eric yet(Many thanks for that). Appreciate it if you could
give this a spin and let me know.

(The revised ACPICA pull request for IORT E.d related changes is
here[1] and this is now merged to acpica:master.)

Please take a look and let me know your thoughts.

Thanks,
Shameer
[0] https://lore.kernel.org/linux-arm-kernel/c982f1d7-c565-769a-abae-79c962969d88@arm.com/
[1] https://github.com/acpica/acpica/pull/765

From old:
We have faced issues with 3408iMR RAID controller cards which
fail to boot when SMMU is enabled. This is because these
controllers make use of host memory for various caching related
purposes and when SMMU is enabled the iMR firmware fails to
access these memory regions as there is no mapping for them.
IORT RMR provides a way for UEFI to describe and report these
memory regions so that the kernel can make a unity mapping for
these in SMMU.

Change History:

v7 --> v8
- Patch #1 has temp definitions for RMR related changes till
the ACPICA header changes are part of kernel.
- No early parsing of RMR node info and is only parsed at the
time of use.
- Changes to the RMR get/put API format compared to the
previous version.
- Support for RMR descriptor shared by multiple stream IDs.

v6 --> v7
-fix pointed out by Steve to the SMMUv2 SMR bypass install in patch #8.

v5 --> v6
- Addressed comments from Robin & Lorenzo.
: Moved iort_parse_rmr() to acpi_iort_init() from
iort_init_platform_devices().
: Removed use of struct iort_rmr_entry during the initial
parse. Using struct iommu_resv_region instead.
: Report RMR address alignment and overlap errors, but continue.
: Reworked arm_smmu_init_bypass_stes() (patch # 6).
- Updated SMMUv2 bypass SMR code. Thanks to Jon N (patch #8).
- Set IOMMU protection flags(IOMMU_CACHE, IOMMU_MMIO) based
on Type of RMR region. Suggested by Jon N.

v4 --> v5
-Added a fw_data union to struct iommu_resv_region and removed
struct iommu_rmr (Based on comments from Joerg/Robin).
-Added iommu_put_rmrs() to release mem.
-Thanks to Steve for verifying on SMMUv2, but not added the Tested-by
yet because of the above changes.

v3 -->v4
-Included the SMMUv2 SMR bypass install changes suggested by
Steve(patch #7)
-As per Robin's comments, RMR reserve implementation is now
more generic (patch #8) and dropped v3 patches 8 and 10.
-Rebase to 5.13-rc1

RFC v2 --> v3
-Dropped RFC tag as the ACPICA header changes are now ready to be
part of 5.13[0]. But this series still has a dependency on that patch.
-Added IORT E.b related changes(node flags, _DSM function 5 checks for
PCIe).
-Changed RMR to stream id mapping from M:N to M:1 as per the spec and
discussion here[1].
-Last two patches add support for SMMUv2(Thanks to Jon Nettleton!)

Jon Nettleton (1):
iommu/arm-smmu: Get associated RMR info and install bypass SMR

Shameer Kolothum (10):
ACPI/IORT: Add temporary RMR node flag definitions
iommu: Introduce a union to struct iommu_resv_region
ACPI/IORT: Make iort_iommu_msi_get_resv_regions() return void
ACPI/IORT: Provide a generic helper to retrieve reserve regions
iommu/dma: Introduce a helper to remove reserved regions
ACPI/IORT: Add support to retrieve IORT RMR reserved regions
ACPI/IORT: Add a helper to retrieve RMR info directly
iommu/arm-smmu-v3: Introduce strtab init helper
iommu/arm-smmu-v3: Refactor arm_smmu_init_bypass_stes() to force
bypass
iommu/arm-smmu-v3: Get associated RMR info and install bypass STE

drivers/acpi/arm64/iort.c | 369 ++++++++++++++++++--
drivers/iommu/apple-dart.c | 2 +-
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 80 ++++-
drivers/iommu/arm/arm-smmu/arm-smmu.c | 54 ++-
drivers/iommu/dma-iommu.c | 11 +-
drivers/iommu/virtio-iommu.c | 2 +-
include/linux/acpi_iort.h | 18 +-
include/linux/dma-iommu.h | 5 +
include/linux/iommu.h | 9 +
9 files changed, 505 insertions(+), 45 deletions(-)

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2.25.1