Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit fa212a97 authored by Lu Baolu's avatar Lu Baolu Committed by Joerg Roedel
Browse files

iommu/vt-d: Probe DMA-capable ACPI name space devices 



Some platforms may support ACPI name-space enumerated devices
that are capable of generating DMA requests. Platforms which
support DMA remapping explicitly declares any such DMA-capable
ACPI name-space devices in the platform through ACPI Name-space
Device Declaration (ANDD) structure and enumerate them through
the Device Scope of the appropriate remapping hardware unit.

Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 98b2fffb

drivers/iommu/intel-iommu.c

+45 −0
Original line number Original line Diff line number Diff line
@@ -4796,6 +4796,48 @@ static int __init platform_optin_force_iommu(void) 
	return 1;

	return 1;

}

}





static int __init probe_acpi_namespace_devices(void)

{

	struct dmar_drhd_unit *drhd;

	struct intel_iommu *iommu;

	struct device *dev;

	int i, ret = 0;



	for_each_active_iommu(iommu, drhd) {

		for_each_active_dev_scope(drhd->devices,

					  drhd->devices_cnt, i, dev) {

			struct acpi_device_physical_node *pn;

			struct iommu_group *group;

			struct acpi_device *adev;



			if (dev->bus != &acpi_bus_type)

				continue;



			adev = to_acpi_device(dev);

			mutex_lock(&adev->physical_node_lock);

			list_for_each_entry(pn,

					    &adev->physical_node_list, node) {

				group = iommu_group_get(pn->dev);

				if (group) {

					iommu_group_put(group);

					continue;

				}



				pn->dev->bus->iommu_ops = &intel_iommu_ops;

				ret = iommu_probe_device(pn->dev);

				if (ret)

					break;

			}

			mutex_unlock(&adev->physical_node_lock);



			if (ret)

				return ret;

		}

	}



	return 0;

}



int __init intel_iommu_init(void)

int __init intel_iommu_init(void)

{

{

	int ret = -ENODEV;

	int ret = -ENODEV;
@@ -4908,6 +4950,9 @@ int __init intel_iommu_init(void) 
	cpuhp_setup_state(CPUHP_IOMMU_INTEL_DEAD, "iommu/intel:dead", NULL,

	cpuhp_setup_state(CPUHP_IOMMU_INTEL_DEAD, "iommu/intel:dead", NULL,

			  intel_iommu_cpu_dead);

			  intel_iommu_cpu_dead);





	if (probe_acpi_namespace_devices())

		pr_warn("ACPI name space devices didn't probe correctly\n");



	/* Finally, we enable the DMA remapping hardware. */

	/* Finally, we enable the DMA remapping hardware. */

	for_each_iommu(iommu, drhd) {

	for_each_iommu(iommu, drhd) {

		if (!translation_pre_enabled(iommu))

		if (!translation_pre_enabled(iommu))