[PATCH V3 0/8] IOMMU probe deferral support
Archit Taneja
architt at codeaurora.org
Mon Oct 24 23:25:21 PDT 2016
On 10/04/2016 10:33 PM, Sricharan R wrote:
> Initial post from Laurent Pinchart[1]. This is
> 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.
>
> If the ACPI bus code follows the same, we can add acpi_dma_configure
> at the same place as of_dma_configure.
>
> This series is based on the recently merged Generic DT bindings for
> PCI IOMMUs and ARM SMMU from Robin Murphy robin.murphy at arm.com [2]
>
> This time tested this with platform and pci device for probe deferral
> and reprobe on arm64 based platform. There is an issue on the cleanup
> path for arm64 though, where there is WARN_ON if the dma_ops is reset while
> device is attached to an domain in arch_teardown_dma_ops.
> But with iommu_groups created from the iommu driver, the device is always
> attached to a domain/default_domain. So so the WARN has to be removed/handled
> probably.
>
Tested-by: Archit Taneja <architt at codeaurora.org>
> Previous post of this series [3].
>
> [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 [2].
>
> * 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
>
> [1] http://lists.linuxfoundation.org/pipermail/iommu/2015-May/013016.html
> [2] http://www.spinics.net/lists/devicetree/msg142943.html
> [3] https://www.mail-archive.com/iommu@lists.linux-foundation.org/msg13941.html
> [4] https://www.mail-archive.com/iommu@lists.linux-foundation.org/msg13940.html
>
>
>
> Laurent Pinchart (4):
> arm: dma-mapping: Don't override dma_ops in arch_setup_dma_ops()
> 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
>
> Sricharan R (4):
> drivers: platform: Configure dma operations at probe time
> arm: dma-mapping: Reset the device's dma_ops
> arm/arm64: dma-mapping: Call iommu's remove_device callback during
> device detach
> arm64: dma-mapping: Remove the notifier trick to handle early setting
> of dma_ops
>
> arch/arm/mm/dma-mapping.c | 18 ++++++++
> arch/arm64/mm/dma-mapping.c | 107 +++++---------------------------------------
> drivers/base/dd.c | 10 +++++
> drivers/base/dma-mapping.c | 11 +++++
> drivers/iommu/of_iommu.c | 47 +++++++++++++++++--
> drivers/of/address.c | 20 ++++++++-
> drivers/of/device.c | 34 +++++++-------
> drivers/of/platform.c | 9 ----
> drivers/pci/probe.c | 5 +--
> include/linux/dma-mapping.h | 3 ++
> include/linux/of_device.h | 7 ++-
> 11 files changed, 138 insertions(+), 133 deletions(-)
>
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