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powerpc/dart: use the generic iommu bypass code 

Use the generic iommu bypass code instead of overriding set_dma_mask.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christoph Hellwig 2019-02-13 08:01:11 +01:00 committed by Michael Ellerman
parent ee69049e00
commit 9f4a68d464
1 changed files with 17 additions and 30 deletions
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47
arch/powerpc/sysdev/dart_iommu.c
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@ -360,13 +360,6 @@ static void iommu_table_dart_setup(void)
set_bit(iommu_table_dart.it_size - 1, iommu_table_dart.it_map);
}
static void pci_dma_dev_setup_dart(struct pci_dev *dev)
{
if (dart_is_u4)
set_dma_offset(&dev->dev, DART_U4_BYPASS_BASE);
set_iommu_table_base(&dev->dev, &iommu_table_dart);
}
static void pci_dma_bus_setup_dart(struct pci_bus *bus)
{
if (!iommu_table_dart_inited) {
@ -390,27 +383,18 @@ static bool dart_device_on_pcie(struct device *dev)
return false;
}
static int dart_dma_set_mask(struct device *dev, u64 dma_mask)
static void pci_dma_dev_setup_dart(struct pci_dev *dev)
{
if (!dev->dma_mask || !dma_supported(dev, dma_mask))
return -EIO;
if (dart_is_u4 && dart_device_on_pcie(&dev->dev))
set_dma_offset(&dev->dev, DART_U4_BYPASS_BASE);
set_iommu_table_base(&dev->dev, &iommu_table_dart);
}
/* U4 supports a DART bypass, we use it for 64-bit capable
* devices to improve performances. However, that only works
* for devices connected to U4 own PCIe interface, not bridged
* through hypertransport. We need the device to support at
* least 40 bits of addresses.
*/
if (dart_device_on_pcie(dev) && dma_mask >= DMA_BIT_MASK(40)) {
dev_info(dev, "Using 64-bit DMA iommu bypass\n");
set_dma_ops(dev, &dma_nommu_ops);
} else {
dev_info(dev, "Using 32-bit DMA via iommu\n");
set_dma_ops(dev, &dma_iommu_ops);
}
*dev->dma_mask = dma_mask;
return 0;
static bool iommu_bypass_supported_dart(struct pci_dev *dev, u64 mask)
{
return dart_is_u4 &&
dart_device_on_pcie(&dev->dev) &&
mask >= DMA_BIT_MASK(40);
}
void __init iommu_init_early_dart(struct pci_controller_ops *controller_ops)
@ -430,12 +414,15 @@ void __init iommu_init_early_dart(struct pci_controller_ops *controller_ops)
if (dart_init(dn) != 0)
return;
/* Setup bypass if supported */
if (dart_is_u4)
ppc_md.dma_set_mask = dart_dma_set_mask;
/*
* U4 supports a DART bypass, we use it for 64-bit capable devices to
* improve performance. However, that only works for devices connected
* to the U4 own PCIe interface, not bridged through hypertransport.
* We need the device to support at least 40 bits of addresses.
*/
controller_ops->dma_dev_setup = pci_dma_dev_setup_dart;
controller_ops->dma_bus_setup = pci_dma_bus_setup_dart;
controller_ops->iommu_bypass_supported = iommu_bypass_supported_dart;
/* Setup pci_dma ops */
set_pci_dma_ops(&dma_iommu_ops);