Commit 5702ee24 authored by Jean-Philippe Brucker's avatar Jean-Philippe Brucker Committed by Will Deacon
Browse files

ACPI/IORT: Check ATS capability in root complex nodes 



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: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: default avatarJean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent b9ae16d8

drivers/acpi/arm64/iort.c

+11 −0
Original line number Diff line number Diff line
@@ -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;

include/linux/iommu.h

+4 −0
Original line number Diff line number Diff line
@@ -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);

CRA Git | Maintained and supported by SUSTech CRA and CCSE