of/acpi: Configure dma operations at probe time for platform/amba/pci bus devices
authorSricharan R <sricharan@codeaurora.org>
Mon, 10 Apr 2017 11:21:01 +0000 (16:51 +0530)
committerJoerg Roedel <jroedel@suse.de>
Thu, 20 Apr 2017 14:31:06 +0000 (16:31 +0200)
commit09515ef5ddad71c7820e5e428da418b709feeb26
tree3786792035e575e806a629cbf02ac3c96f5ebe53
parentefc8551a276faab19d85079da02c5fb602b0dcbe
of/acpi: Configure dma operations at probe time for platform/amba/pci bus devices

Configuring DMA ops at probe time will allow deferring device probe when
the IOMMU isn't available yet. The dma_configure for the device is
now called from the generic device_attach callback just before the
bus/driver probe is called. This way, configuring the DMA ops for the
device would be called at the same place for all bus_types, hence the
deferred probing mechanism should work for all buses as well.

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.

This patch changes the dma ops configuration to probe time for
both OF and ACPI based platform/amba/pci bus devices.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com> (drivers/pci part)
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
drivers/acpi/glue.c
drivers/base/dd.c
drivers/base/dma-mapping.c
drivers/of/platform.c
drivers/pci/probe.c
include/linux/dma-mapping.h