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[v2,0/4] iommu: Add Allwinner H6 IOMMU driver

Message ID cover.a31c229a83f1d92e6928ae2adb70887da0fd44b3.1582222496.git-series.maxime@cerno.tech (mailing list archive)
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Series iommu: Add Allwinner H6 IOMMU driver | expand

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Maxime Ripard Feb. 20, 2020, 6:15 p.m. UTC 
Hi,

Here's a series adding support for the IOMMU introduced in the Allwinner
H6. The driver from Allwinner hints at more SoCs using it in the future
(with more masters), so we can bet on that IOMMU becoming pretty much
standard in new SoCs from Allwinner.

One thing I wasn't really sure about was how to expose the statistics
reported by the IOMMU PMU (TLB hit rates, latencies, and so on). The
Allwinner driver exposes them through custom sysfs files, while they would
be best represented through perf I guess? Anyway, I'm planning to support
them later on.

Let me know what you think,
Maxime

Changes from v1:
  - Add a patch to configure the IOMMU on the virtual DRM device
  - Rework the domain allocation / freeing
  - Remove the runtime_pm handling to power up the device and rely on
    refcounting
  - use map gfp argument for kmem cache allocation
  - Removed unused macros
  - Switched from BIT(0) to 1 for the page table entry valid flag to make
    it more obvious that it's over multiple bits.
  - Switch to module_initcall
  - Make accesses to the fwspec more consistant
  - Removed dev_info logs
  - Reworked invalidation / flushing
  - Allow for compilation with COMPILE_TEST

Maxime Ripard (4):
  dt-bindings: iommu: Add Allwinner H6 IOMMU bindings
  iommu: Add Allwinner H6 IOMMU driver
  arm64: dts: allwinner: h6: Add IOMMU
  drm/sun4i: mixer: Call of_dma_configure if there's an IOMMU

 Documentation/devicetree/bindings/iommu/allwinner,sun50i-h6-iommu.yaml |   61 ++++-
 arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi                           |   10 +-
 drivers/gpu/drm/sun4i/sun8i_mixer.c                                    |   13 +-
 drivers/iommu/Kconfig                                                  |    9 +-
 drivers/iommu/Makefile                                                 |    1 +-
 drivers/iommu/sun50i-iommu.c                                           | 1072 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 6 files changed, 1166 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iommu/allwinner,sun50i-h6-iommu.yaml
 create mode 100644 drivers/iommu/sun50i-iommu.c

base-commit: bb6d3fb354c5ee8d6bde2d576eb7220ea09862b9