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ACPI/IORT: Check ATS capability in root complex nodes

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Root complex node in IORT has a bit telling whether it supports ATS or
not. Store this bit in the IOMMU fwspec when setting up a device, so it
can be accessed later by an IOMMU driver. In the future we'll probably
want to store this bit at the host bridge or SMMU rather than in each
endpoint.

Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Jean-Philippe Brucker 2019-04-17 19:24:42 +01:00 committed by Will Deacon
parent b9ae16d80a
commit 5702ee2418
2 changed files with 15 additions and 0 deletions
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11
drivers/acpi/arm64/iort.c
View file

@ -1028,6 +1028,14 @@ void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size)
dev_dbg(dev, "dma_pfn_offset(%#08llx)\n", offset);
}
static bool iort_pci_rc_supports_ats(struct acpi_iort_node *node)
{
struct acpi_iort_root_complex *pci_rc;
pci_rc = (struct acpi_iort_root_complex *)node->node_data;
return pci_rc->ats_attribute & ACPI_IORT_ATS_SUPPORTED;
}
/**
* iort_iommu_configure - Set-up IOMMU configuration for a device.
*
@ -1063,6 +1071,9 @@ const struct iommu_ops *iort_iommu_configure(struct device *dev)
info.node = node;
err = pci_for_each_dma_alias(to_pci_dev(dev),
iort_pci_iommu_init, &info);
if (!err && iort_pci_rc_supports_ats(node))
dev->iommu_fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS;
} else {
int i = 0;

4
include/linux/iommu.h
View file

@ -392,10 +392,14 @@ struct iommu_fwspec {
const struct iommu_ops *ops;
struct fwnode_handle *iommu_fwnode;
void *iommu_priv;
u32 flags;
unsigned int num_ids;
u32 ids[1];
};
/* ATS is supported */
#define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0)
int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
const struct iommu_ops *ops);
void iommu_fwspec_free(struct device *dev);