From a43a44fc775ec6fe6a7fe71b1fbe175b1e834e7c Mon Sep 17 00:00:00 2001 From: FelixCuioc Date: Sat, 8 Aug 2020 02:43:50 -0400 Subject: [PATCH] iommu/vt-d:Add support for probing ACPI device in RMRR After acpi device in RMRR is detected,it is necessary to establish a mapping for these devices. In acpi_device_create_direct_mappings(),create a mapping for the acpi device in RMRR. Add a helper to achieve the acpi namespace device can access the RMRR region. Signed-off-by: FelixCuioc --- drivers/iommu/intel/iommu.c | 27 +++++++++++++++++++++++++++ drivers/iommu/iommu.c | 6 ++++++ include/linux/iommu.h | 3 +++ 3 files changed, 36 insertions(+) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index f774ef63d473..b31f02f41c96 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4797,6 +4797,20 @@ static int __init platform_optin_force_iommu(void) return 1; } +static int acpi_device_create_direct_mappings(struct device *pn_dev, struct device *acpi_device) +{ + struct iommu_group *group; + + acpi_device->bus->iommu_ops = &intel_iommu_ops; + group = iommu_group_get(pn_dev); + if (!group) { + pr_warn("ACPI name space devices create direct mappings wrong!\n"); + return -1; + } + __acpi_device_create_direct_mappings(group, acpi_device); + + return 0; +} static int __init probe_acpi_namespace_devices(void) { @@ -4812,6 +4826,7 @@ static int __init probe_acpi_namespace_devices(void) struct acpi_device_physical_node *pn; struct iommu_group *group; struct acpi_device *adev; + struct device *pn_dev = NULL; if (dev->bus != &acpi_bus_type) continue; @@ -4822,6 +4837,7 @@ static int __init probe_acpi_namespace_devices(void) &adev->physical_node_list, node) { group = iommu_group_get(pn->dev); if (group) { + pn_dev = pn->dev; iommu_group_put(group); continue; } @@ -4830,7 +4846,18 @@ static int __init probe_acpi_namespace_devices(void) ret = iommu_probe_device(pn->dev); if (ret) break; + pn_dev = pn->dev; + } + if (pn_dev == NULL) { + dev->bus->iommu_ops = &intel_iommu_ops; + ret = iommu_probe_device(dev); + if (ret) { + pr_err("acpi_device probe fail! ret:%d\n", ret); + return ret; + } + return 0; } + ret = acpi_device_create_direct_mappings(pn_dev, dev); mutex_unlock(&adev->physical_node_lock); if (ret) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 609bd25bf154..4f714a2d5ef7 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -779,6 +779,12 @@ static bool iommu_is_attach_deferred(struct iommu_domain *domain, return false; } +void __acpi_device_create_direct_mappings(struct iommu_group *group, struct device *acpi_device) +{ + iommu_create_device_direct_mappings(group, acpi_device); +} +EXPORT_SYMBOL_GPL(__acpi_device_create_direct_mappings); + /** * iommu_group_add_device - add a device to an iommu group * @group: the group into which to add the device (reference should be held) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index fee209efb756..9be134775886 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -514,6 +514,9 @@ extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr) extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev, unsigned long iova, int flags); +extern void __acpi_device_create_direct_mappings(struct iommu_group *group, + struct device *acpi_device); + static inline void iommu_flush_tlb_all(struct iommu_domain *domain) { if (domain->ops->flush_iotlb_all) -- 2.17.1