ACPI: Make acpi_dma_configure() DMA regions aware
Current ACPI DMA configuration set-up device DMA capabilities through kernel defaults that do not take into account platform specific DMA configurations reported by firmware. By leveraging the ACPI acpi_dev_get_dma_resources() API, add code in acpi_dma_configure() to retrieve the DMA regions to correctly set-up PCI devices DMA parameters. Rework the ACPI IORT kernel API to make sure they can accommodate the DMA set-up required by firmware. By making PCI devices DMA set-up ACPI IORT specific, the kernel is shielded from unwanted regressions that could be triggered by parsing DMA resources on arches that were previously ignoring them (ie x86/ia64), leaving kernel behaviour unchanged on those arches. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Tested-by: Nate Watterson <nwatters@codeaurora.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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c04ac679c6
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@ -681,12 +681,17 @@ static const struct iommu_ops *iort_iommu_xlate(struct device *dev,
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}
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/**
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* iort_set_dma_mask - Set-up dma mask for a device.
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* iort_dma_setup() - Set-up device DMA parameters.
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*
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* @dev: device to configure
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* @dma_addr: device DMA address result pointer
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* @size: DMA range size result pointer
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*/
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void iort_set_dma_mask(struct device *dev)
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void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size)
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{
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u64 mask, dmaaddr = 0, size = 0, offset = 0;
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int ret, msb;
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/*
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* Set default coherent_dma_mask to 32 bit. Drivers are expected to
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* setup the correct supported mask.
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@ -700,6 +705,34 @@ void iort_set_dma_mask(struct device *dev)
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*/
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if (!dev->dma_mask)
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dev->dma_mask = &dev->coherent_dma_mask;
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size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
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if (dev_is_pci(dev)) {
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ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size);
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if (!ret) {
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msb = fls64(dmaaddr + size - 1);
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/*
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* Round-up to the power-of-two mask or set
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* the mask to the whole 64-bit address space
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* in case the DMA region covers the full
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* memory window.
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*/
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mask = msb == 64 ? U64_MAX : (1ULL << msb) - 1;
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/*
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* Limit coherent and dma mask based on size
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* retrieved from firmware.
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*/
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dev->coherent_dma_mask = mask;
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*dev->dma_mask = mask;
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}
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}
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*dma_addr = dmaaddr;
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*dma_size = size;
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dev->dma_pfn_offset = PFN_DOWN(offset);
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dev_dbg(dev, "dma_pfn_offset(%#08llx)\n", offset);
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}
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/**
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@ -1446,20 +1446,16 @@ int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
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int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
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{
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const struct iommu_ops *iommu;
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u64 size;
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u64 dma_addr = 0, size = 0;
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iort_set_dma_mask(dev);
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iort_dma_setup(dev, &dma_addr, &size);
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iommu = iort_iommu_configure(dev);
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if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
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/*
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* Assume dma valid range starts at 0 and covers the whole
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* coherent_dma_mask.
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*/
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arch_setup_dma_ops(dev, 0, size, iommu, attr == DEV_DMA_COHERENT);
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arch_setup_dma_ops(dev, dma_addr, size,
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iommu, attr == DEV_DMA_COHERENT);
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return 0;
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}
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@ -36,7 +36,7 @@ struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id);
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void acpi_configure_pmsi_domain(struct device *dev);
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int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);
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/* IOMMU interface */
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void iort_set_dma_mask(struct device *dev);
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void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *size);
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const struct iommu_ops *iort_iommu_configure(struct device *dev);
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#else
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static inline void acpi_iort_init(void) { }
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@ -47,7 +47,8 @@ static inline struct irq_domain *iort_get_device_domain(struct device *dev,
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{ return NULL; }
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static inline void acpi_configure_pmsi_domain(struct device *dev) { }
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/* IOMMU interface */
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static inline void iort_set_dma_mask(struct device *dev) { }
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static inline void iort_dma_setup(struct device *dev, u64 *dma_addr,
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u64 *size) { }
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static inline
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const struct iommu_ops *iort_iommu_configure(struct device *dev)
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{ return NULL; }
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