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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: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2019-05-25 13:41:31 +08:00 committed by Joerg Roedel
parent 98b2fffb5e
commit fa212a97f3
1 changed files with 45 additions and 0 deletions
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45
drivers/iommu/intel-iommu.c
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@ -4796,6 +4796,48 @@ static int __init platform_optin_force_iommu(void)
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 ret = -ENODEV;
@ -4908,6 +4950,9 @@ int __init intel_iommu_init(void)
cpuhp_setup_state(CPUHP_IOMMU_INTEL_DEAD, "iommu/intel:dead", NULL,
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. */
for_each_iommu(iommu, drhd) {
if (!translation_pre_enabled(iommu))