[PATCH v4 00/10] IOMMU probe deferral support

[Sricharan R]

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
       |
driver_probe_device
       |
really_probe
       |
dma_configure

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. Added the patches [9,10],
    drivers: acpi: Configure acpi devices dma operation at probe time
    drivers: acpi: Handle IOMMU lookup failure with deferred probing or error
for doing the dma ops configuration at probe time for acpi based platform
as well. Did not have a acpi based platform to test the changes and with
my still catching up knowledge on acpi/enumeration those two patches needs
to be reviewed/tested more.

Previous post of this series [5].

 [V4]
     * 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.
 [V3]
     * 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
       arm64.

     * Removed the notifier trick in arm64 to handle early device
       registration.

     * 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
       well.
 
     * Fixed a bug to return the correct iommu_ops from patch 7 [4] in
       last post.

     * Fixed few other cosmetic comments.
  
 [V2]
     * Updated the Initial post to call dma_configure/deconfigure from
       generic code
 
     * Added iommu add_device callback from of_iommu_configure path

 [V1]
     * 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] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-October/460832.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

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
    error

 arch/arm64/mm/dma-mapping.c | 132 ++++----------------------------------------
 drivers/acpi/arm64/iort.c   |  17 +++++-
 drivers/acpi/glue.c         |   6 --
 drivers/acpi/scan.c         |   7 ++-
 drivers/base/dd.c           |  10 ++++
 drivers/base/dma-mapping.c  |  32 +++++++++++
 drivers/iommu/arm-smmu-v3.c |  35 +-----------
 drivers/iommu/arm-smmu.c    |  58 +++----------------
 drivers/iommu/dma-iommu.c   |   1 +
 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         |  17 +++---
 include/acpi/acpi_bus.h     |   2 +-
 include/linux/acpi.h        |   7 ++-
 include/linux/dma-mapping.h |   3 +
 include/linux/of_device.h   |  10 +++-
 include/linux/pci.h         |   5 ++
 19 files changed, 238 insertions(+), 284 deletions(-)

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