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of/acpi: Configure dma operations at probe time for platform/amba/pci bus devices

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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>
This commit is contained in:
Sricharan R
2017-04-10 16:51:01 +05:30
committed by Joerg Roedel
parent efc8551a27
commit 09515ef5dd
6 changed files with 62 additions and 37 deletions
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28
drivers/pci/probe.c
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@@ -1893,33 +1893,6 @@ static void pci_set_msi_domain(struct pci_dev *dev)
dev_set_msi_domain(&dev->dev, d);
}
/**
* pci_dma_configure - Setup DMA configuration
* @dev: ptr to pci_dev struct of the PCI device
*
* Function to update PCI devices's DMA configuration using the same
* info from the OF node or ACPI node of host bridge's parent (if any).
*/
static void pci_dma_configure(struct pci_dev *dev)
{
struct device *bridge = pci_get_host_bridge_device(dev);
if (IS_ENABLED(CONFIG_OF) &&
bridge->parent && bridge->parent->of_node) {
of_dma_configure(&dev->dev, bridge->parent->of_node);
} else if (has_acpi_companion(bridge)) {
struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
enum dev_dma_attr attr = acpi_get_dma_attr(adev);
if (attr == DEV_DMA_NOT_SUPPORTED)
dev_warn(&dev->dev, "DMA not supported.\n");
else
acpi_dma_configure(&dev->dev, attr);
}
pci_put_host_bridge_device(bridge);
}
void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
{
int ret;
@@ -1933,7 +1906,6 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
dev->dev.dma_mask = &dev->dma_mask;
dev->dev.dma_parms = &dev->dma_parms;
dev->dev.coherent_dma_mask = 0xffffffffull;
pci_dma_configure(dev);
pci_set_dma_max_seg_size(dev, 65536);
pci_set_dma_seg_boundary(dev, 0xffffffff);