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ACPI/IORT: Parse SSID property of named component node 

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>
This commit is contained in:
Jean-Philippe Brucker 2020-01-15 13:52:30 +01:00 committed by Will Deacon
parent 89535821c0
commit da22565d1d
1 changed files with 18 additions and 0 deletions
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18
drivers/acpi/arm64/iort.c
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@ -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);
}
/*