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Commit 10d8ab2c authored by Lorenzo Pieralisi's avatar Lorenzo Pieralisi Committed by Rafael J. Wysocki
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ACPI/IORT: Add IORT named component memory address limits 



IORT named components provide firmware configuration describing
how many address bits a given device is capable of generating
to address memory.

Add code to the kernel to retrieve memory address limits
configuration for IORT named components and configure DMA masks
accordingly.

Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Tested-by: default avatarNate Watterson <nwatters@codeaurora.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 7ad42639

drivers/acpi/arm64/iort.c

+37 −17
Original line number Diff line number Diff line
@@ -680,6 +680,24 @@ static const struct iommu_ops *iort_iommu_xlate(struct device *dev, 
	return ret ? NULL : ops;

}



static int nc_dma_get_range(struct device *dev, u64 *size)

{

	struct acpi_iort_node *node;

	struct acpi_iort_named_component *ncomp;



	node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,

			      iort_match_node_callback, dev);

	if (!node)

		return -ENODEV;



	ncomp = (struct acpi_iort_named_component *)node->node_data;



	*size = ncomp->memory_address_limit >= 64 ? U64_MAX :

			1ULL<<ncomp->memory_address_limit;



	return 0;

}



/**

 * iort_dma_setup() - Set-up device DMA parameters.

 *
@@ -708,8 +726,11 @@ void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) 


	size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);



	if (dev_is_pci(dev)) {

	if (dev_is_pci(dev))

		ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size);

	else

		ret = nc_dma_get_range(dev, &size);



	if (!ret) {

		msb = fls64(dmaaddr + size - 1);

		/*
@@ -726,7 +747,6 @@ void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) 
		dev->coherent_dma_mask = mask;

		*dev->dma_mask = mask;

	}

	}



	*dma_addr = dmaaddr;

	*dma_size = size;