RE: [PATCH V7 00/11] IOMMU probe deferral support

["Sricharan" <sricharan@codeaurora.org>]

Hi Marek,

>On 2017-01-23 17:18, Sricharan R wrote:
>> 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.
>> * Need help for testing with ACPI.
>
>Once again:
>
>Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
>
>Works fine on Exynos machines (both, ARM and ARM64 based). This patchset is
>urgently needed as more and more stuff depends on it and cannot be easily
>workarounded without nasty hacks (for example pending runtime PM changes
>for clocks and power domains integration for Exynos 5433).
>

Ok, Thanks for the testing once again.

>Is there a chance to have it merged to v4.11?
>

Ya, hoping that this time it would get through.

Regards,
 Sricharan

>> Previous post of this series [6].
>>
>>   [V7]
>>       * Updated the subject and commit log for patch #6 as per
>>         comments from Lorenzo. No functional changes.
>>
>>   [V6]
>>       * Fixed a bug in dma_configure function pointed out by
>>         Robin.
>>       * Reordered the patches as per comments from Robin and
>>         Lorenzo.
>>       * Added Tags.
>>
>>   [V5]
>>       * 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].
>>
>>   [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] git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git iommu/probe-deferral
>> [6] https://www.spinics.net/lists/arm-kernel/msg556546.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 (3):
>>    of/acpi: Configure dma operations at probe time for platform/amba/pci bus devices
>>    drivers: acpi: Handle IOMMU lookup failure with deferred probing or
>>      error
>>    arm64: dma-mapping: Remove the notifier trick to handle early setting
>>      of dma_ops
>>
>>   arch/arm64/mm/dma-mapping.c       | 132 ++++----------------------------------
>>   drivers/acpi/arm64/iort.c         |  40 +++++++++++-
>>   drivers/acpi/glue.c               |   5 --
>>   drivers/acpi/scan.c               |   7 +-
>>   drivers/base/dd.c                 |   9 +++
>>   drivers/base/dma-mapping.c        |  41 ++++++++++++
>>   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, 252 insertions(+), 320 deletions(-)
>>
>
>Best regards
>--
>Marek Szyprowski, PhD
>Samsung R&D Institute Poland
>
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