Re: [PATCH v3 04/13] ACPI/IORT: Support PASID for platform devices
From: Auger Eric <eric.auger@redhat.com>
Date: 2019-12-17 13:27:22
Also in:
linux-acpi, linux-devicetree, linux-iommu, linux-pci
Hi Jean, On 12/9/19 7:05 PM, Jean-Philippe Brucker wrote:
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> Signed-off-by: Jean-Philippe Brucker <redacted>
Reviewed-by: Eric Auger <eric.auger@redhat.com> Thanks Eric
quoted hunk ↗ jump to hunk
--- drivers/acpi/arm64/iort.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 33f71983e001..39f389214ecf 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c@@ -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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