[PATCH V5 00/12] IOMMU probe deferral support

Sricharan R sricharan at codeaurora.org
Thu Jan 19 07:05:44 PST 2017

This series calls the dma ops configuration for the devices
at a generic place so that it works for all busses.
The dma_configure_ops for a device is now called during
the device_attach callback just before the probe of the
bus/driver is called. Similarly dma_deconfigure is called during
device/driver_detach path.

pci_bus_add_devices    (platform/amba)(_device_create/driver_register)
       |                         |
pci_bus_add_device     (device_add/driver_register)
       |                         |
device_attach           device_initial_probe
       |                         |
__device_attach_driver    __device_attach_driver

Similarly on the device/driver_unregister path __device_release_driver is
called which inturn calls dma_deconfigure.

Took the reworked patches [2] from Robin's branch and
rebased on top of Lorenzo's ACPI IORT ARM support series [3].

* Tested with platform and pci devices for probe deferral
  and reprobe on arm64 based platform.
* Tested with arm32 platform.
* Need help for testing with ACPI.

Previous post of this series [6]. 

     * Reworked the pci configuration code hanging outside and
       pushed it to dma_configure as in PATCH#5,6,7.
       Also added a couple of patches that Lorenzo provided for
       correcting the Probe deferring mechanism in case of
       ACPI devices from here [5].

     * Took the reworked patches [2] from Robin's branch and
       rebased on top of Lorenzo's ACPI IORT ARM support series [3].

     * Added the patches for moving the dma ops configuration of
       acpi based devices to probe time as well.
     * Removed the patch to split dma_masks/dma_ops configuration
       separately based on review comments that both masks and ops are
       required only during the device probe time.

     * Reworked the series based on Generic DT bindings series.

     * Added call to iommu's remove_device in the cleanup path for arm and

     * Removed the notifier trick in arm64 to handle early device

     * Added reset of dma_ops in cleanup path for arm based on comments.

     * Fixed the pci_iommu_configure path and tested with PCI device as
     * Fixed a bug to return the correct iommu_ops from patch 7 [4] in
       last post.

     * Fixed few other cosmetic comments.
     * Updated the Initial post to call dma_configure/deconfigure from
       generic code
     * Added iommu add_device callback from of_iommu_configure path

     * Initial post from Laurent Pinchart [1]

[1] http://lists.linuxfoundation.org/pipermail/iommu/2015-May/013016.html
[2] http://www.linux-arm.org/git?p=linux-rm.git;a=shortlog;h=refs/heads/iommu/defer
[3] https://lkml.org/lkml/2016/11/21/141
[4] https://www.mail-archive.com/iommu@lists.linux-foundation.org/msg13940.html
[5] git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git iommu/probe-deferral
[6] https://www.spinics.net/lists/linux-arm-msm/msg24936.html

Laurent Pinchart (3):
  of: dma: Move range size workaround to of_dma_get_range()
  of: dma: Make of_dma_deconfigure() public
  iommu: of: Handle IOMMU lookup failure with deferred probing or error

Lorenzo Pieralisi (2):
  ACPI/IORT: Add function to check SMMUs drivers presence
  ACPI/IORT: Remove linker section for IORT entries probing

Robin Murphy (3):
  iommu/of: Refactor of_iommu_configure() for error handling
  iommu/of: Prepare for deferred IOMMU configuration
  iommu/arm-smmu: Clean up early-probing workarounds

Sricharan R (4):
  drivers: platform: Configure dma operations at probe time
  arm64: dma-mapping: Remove the notifier trick to handle early setting
    of dma_ops
  drivers: acpi: Configure acpi devices dma operation at probe time
  drivers: acpi: Handle IOMMU lookup failure with deferred probing or

 arch/arm64/mm/dma-mapping.c       | 132 ++++----------------------------------
 drivers/acpi/arm64/iort.c         |  40 +++++++++++-
 drivers/acpi/glue.c               |   6 --
 drivers/acpi/scan.c               |   7 +-
 drivers/base/dd.c                 |   9 +++
 drivers/base/dma-mapping.c        |  44 +++++++++++++
 drivers/iommu/arm-smmu-v3.c       |  46 +------------
 drivers/iommu/arm-smmu.c          |  58 +++--------------
 drivers/iommu/of_iommu.c          | 114 +++++++++++++++++++++++---------
 drivers/of/address.c              |  20 +++++-
 drivers/of/device.c               |  36 ++++++-----
 drivers/of/platform.c             |  10 +--
 drivers/pci/probe.c               |  28 --------
 include/acpi/acpi_bus.h           |   2 +-
 include/asm-generic/vmlinux.lds.h |   1 -
 include/linux/acpi.h              |   7 +-
 include/linux/acpi_iort.h         |   3 -
 include/linux/dma-mapping.h       |   3 +
 include/linux/of_device.h         |  10 ++-
 19 files changed, 255 insertions(+), 321 deletions(-)

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