ACPI/IORT: Parse SSID property of named component node (da22565d) · Commits · 戴 / test

Named component nodes in the IORT tables describe the number of Substream ID bits (aka. PASID) supported by the device. Propagate this value to the fwspec structure in order to enable PASID for platform devices. Acked-by:

Hanjun Guo <guohanjun@huawei.com> Reviewed-by:

Eric Auger <eric.auger@redhat.com> Reviewed-by:

Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by:

Jean-Philippe Brucker <jean-philippe@linaro.org> Signed-off-by:

Will Deacon <will@kernel.org>

drivers/acpi/arm64/iort.c

+18 −0

Original line number	Diff line number	Diff line
		@@ -11,6 +11,7 @@
		#define pr_fmt(fmt) "ACPI: IORT: " fmt

		#include <linux/acpi_iort.h>
		#include <linux/bitfield.h>
		#include <linux/iommu.h>
		#include <linux/kernel.h>
		#include <linux/list.h>
		@@ -924,6 +925,20 @@ static int iort_pci_iommu_init(struct pci_dev pdev, u16 alias, void data)
		return iort_iommu_xlate(info->dev, parent, streamid);
		}

		static void iort_named_component_init(struct device *dev,
		struct acpi_iort_node *node)
		{
		struct acpi_iort_named_component *nc;
		struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);

		if (!fwspec)
		return;

		nc = (struct acpi_iort_named_component *)node->node_data;
		fwspec->num_pasid_bits = FIELD_GET(ACPI_IORT_NC_PASID_BITS,
		nc->node_flags);
		}

		/**
		* iort_iommu_configure - Set-up IOMMU configuration for a device.
		*
		@@ -978,6 +993,9 @@ const struct iommu_ops iort_iommu_configure(struct device dev)
		if (parent)
		err = iort_iommu_xlate(dev, parent, streamid);
		} while (parent && !err);

		if (!err)
		iort_named_component_init(dev, node);
		}

		/*

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