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| author | Lu Baolu <baolu.lu@linux.intel.com> | 2019-05-25 07:41:31 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2019-05-28 10:19:10 +0200 |
| commit | fa212a97f3a366adcb2046c565e7c978ab067c73 (patch) | |
| tree | bcd868e9d2fec6cc60686177ac4d10f8ab1b887a /drivers/iommu | |
| parent | iommu/vt-d: Handle 32bit device with identity default domain (diff) | |
| download | linux-fa212a97f3a366adcb2046c565e7c978ab067c73.tar.xz linux-fa212a97f3a366adcb2046c565e7c978ab067c73.zip | |
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>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 87f9f2237238..0bae0b73076c 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -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)) |