From ee69049e00c2b2ade9b8e3d4d0e69ccf00af91df Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 13 Feb 2019 08:01:10 +0100 Subject: powerpc/dart: remove dead cleanup code in iommu_init_early_dart If dart_init failed we didn't have a chance to setup dma or controller ops yet, so there is no point in resetting them. Signed-off-by: Christoph Hellwig Signed-off-by: Michael Ellerman --- arch/powerpc/sysdev/dart_iommu.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-) (limited to 'arch/powerpc/sysdev/dart_iommu.c') diff --git a/arch/powerpc/sysdev/dart_iommu.c b/arch/powerpc/sysdev/dart_iommu.c index a5b40d1460f1..283ce04c5844 100644 --- a/arch/powerpc/sysdev/dart_iommu.c +++ b/arch/powerpc/sysdev/dart_iommu.c @@ -428,7 +428,7 @@ void __init iommu_init_early_dart(struct pci_controller_ops *controller_ops) /* Initialize the DART HW */ if (dart_init(dn) != 0) - goto bail; + return; /* Setup bypass if supported */ if (dart_is_u4) @@ -439,15 +439,6 @@ void __init iommu_init_early_dart(struct pci_controller_ops *controller_ops) /* Setup pci_dma ops */ set_pci_dma_ops(&dma_iommu_ops); - return; - - bail: - /* If init failed, use direct iommu and null setup functions */ - controller_ops->dma_dev_setup = NULL; - controller_ops->dma_bus_setup = NULL; - - /* Setup pci_dma ops */ - set_pci_dma_ops(&dma_nommu_ops); } #ifdef CONFIG_PM -- cgit From 9f4a68d464a35166dcc84e54c7076f5f4ae5503a Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 13 Feb 2019 08:01:11 +0100 Subject: 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 Signed-off-by: Michael Ellerman --- arch/powerpc/sysdev/dart_iommu.c | 47 +++++++++++++++------------------------- 1 file changed, 17 insertions(+), 30 deletions(-) (limited to 'arch/powerpc/sysdev/dart_iommu.c') diff --git a/arch/powerpc/sysdev/dart_iommu.c b/arch/powerpc/sysdev/dart_iommu.c index 283ce04c5844..d42ba645d51d 100644 --- a/arch/powerpc/sysdev/dart_iommu.c +++ b/arch/powerpc/sysdev/dart_iommu.c @@ -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; - - /* 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); - } + 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); +} - *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); -- cgit From 0617fc0ca412b535c0ab0e5e7b03180067f0f7fd Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 13 Feb 2019 08:01:32 +0100 Subject: powerpc/dma: remove set_dma_offset There is no good reason for this helper, just opencode it. Signed-off-by: Christoph Hellwig Tested-by: Christian Zigotzky Signed-off-by: Michael Ellerman --- arch/powerpc/sysdev/dart_iommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/powerpc/sysdev/dart_iommu.c') diff --git a/arch/powerpc/sysdev/dart_iommu.c b/arch/powerpc/sysdev/dart_iommu.c index d42ba645d51d..809797dbe169 100644 --- a/arch/powerpc/sysdev/dart_iommu.c +++ b/arch/powerpc/sysdev/dart_iommu.c @@ -386,7 +386,7 @@ static bool dart_device_on_pcie(struct device *dev) static void pci_dma_dev_setup_dart(struct pci_dev *dev) { if (dart_is_u4 && dart_device_on_pcie(&dev->dev)) - set_dma_offset(&dev->dev, DART_U4_BYPASS_BASE); + dev->dev.archdata.dma_offset = DART_U4_BYPASS_BASE; set_iommu_table_base(&dev->dev, &iommu_table_dart); } -- cgit