diff options
| author | Sricharan R <sricharan@codeaurora.org> | 2017-04-10 16:51:01 +0530 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2017-04-20 16:31:06 +0200 |
| commit | 09515ef5ddad71c7820e5e428da418b709feeb26 (patch) | |
| tree | 3786792035e575e806a629cbf02ac3c96f5ebe53 /drivers/pci/probe.c | |
| parent | efc8551a276faab19d85079da02c5fb602b0dcbe (diff) | |
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>
Diffstat (limited to 'drivers/pci/probe.c')
| -rw-r--r-- | drivers/pci/probe.c | 28 |
1 files changed, 0 insertions, 28 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index dfc9a2794141..5a8dd43db336 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -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); |